Apparatus for receiving signals in OFDM communication system having multiple antennas and method thereof

Provided are an apparatus for receiving signals in an OFDM communication system using multiple transmission/reception antennas and a method thereof. The method includes modulating a predetermined part of a data stream based on a multi-dimensional reception procedure to generate a first modulated data stream; regenerating a symbol corresponding to the modulated data stream; eliminating the regenerated symbol from a remained data stream; modulating the eliminated data stream to generate a second modulated data stream; and outputting an output signal obtained by serializing the first modulated data stream and the second modulated data stream.

Apparatus for transmitting and receiving data to provide high-speed data communication and method thereof

In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used.

Apparatus and method for transmitting/receiving data in communication system

A data transmission apparatus in a communication system includes a reception unit configured to receive terminal information from a plurality of terminals through a new frequency band for transmission and reception of data between the plurality of terminals and an AP (access point); a determination unit configured to determine access timing of the terminals to the AP by using the terminal information, and generate terminal access information including information on the access timing; and a transmission unit configured to transmit the terminal access information and beacon frames to the terminals, wherein the terminals access the AP and transmit data frames to the AP, at the access timing based on the beacon frames.

Apparatus for transmitting and receiving data to provide high-speed data communication and method thereof

In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used.

Method and device for tracking carrier frequency offset and sampling frequency offset in orthogonal frequency division multiplexing wireless communication system

A method for tracking carrier frequency and sampling frequency offsets in an OFDM wireless communication system comprises: (a) detecting data received from the transmitter using a first signal, and tracking a phase offset caused by the carrier frequency offset using the detected received data; (b) detecting the data received from the transmitter using the first signal, and tracking the phase offset caused by the sampling frequency offset using the detected received data; (c) compensating for the phase offset caused by the carrier frequency offset between the transmitter and the receiver according to the phase offset tracked in (a); and (d) compensating for the phase offset caused by the sampling frequency offset between the transmitter and the receiver according to the phase offset tracked in (b).

Transmitting and receiving systems for increasing service coverage in orthogonal frequency division multiplexing wireless local area network, and method thereof

The present invention relates to an orthogonal frequency division multiplexing wireless local area network (LAN) transmitting/receiving system for providing expanded service coverage, and a method thereof. According to the present invention, first OFDM modulation is performed for an even-numbered time, and second OFDM modulation is performed by changing subcarrier allocation positions of first OFDM modulated symbols for an odd-numbered time. In addition, a transmitting frame including a plurality of signal fields according to the first and second OFDM modulation is transmitted. The receiving system determines a format configuration of the received frame to determine whether a signal field is repeatedly generated in the frame. When it is determined that the signal field is not repeatedly generated, corresponding demodulation is performed. When it is determined that the signal field is repeatedly performed, the signal field is demodulated by using first bit allocation information and is demodulated ...

METHOD FOR ENCODING LOW DENSITY PARITY CHECK CODES USING RESULT OF CHECKING PREVIOUSLY SPECIFIED PARITY BITS

There is provided to a method for encoding an LDPC (Low Density Parity Check) code using the result of checking a previously specified parity, including the steps of: forming a parity bit check matrix having a dual diagonal structure consisting of (N-K) rows for check nodes and (N-K) columns on the basis of the H matrix; calculating the values of all the parity bits by inserting a given binary value in sub-blocks, with the parity bit check matrix formed on the H matrix; if the values of the parity bits are incorrect, checking the parity bit corresponding to the sub-block located in the last part of the H matrix; searching the parity bit parts where the parity bit check result is represented as “1”; performing an XOR operation in sub-blocks on the parity bit part obtained through a simultaneous equation between the parity bits of the searched parity bit parts and the parity bit parts; and determining the value of the parity bit satisfying the condition that the value obtained by multiplying ...

Apparatus and method for transmitting/receiving data in communication system

A data transmission apparatus in a communication system includes a verification unit configured to verify a new frequency band for transmitting and receiving data to and from a plurality of terminals; a generation unit configured to generate a frame in the new frequency band; and a transmission unit configured to transmit data through the new frequency band by using the frame, wherein the frame includes data fields in which data corresponding to the terminals are included, and control fields in which control information for receiving the data included in the data field in the terminals is included, and wherein the control fields include a VHT-STF (very high throughput short training field), a VHT-SIG (very high throughput signal field) A1, a VHT-SIG A2, a plurality of VHT-LTFs (very high throughput long training fields), and a VHT-SIG B.

Apparatus for transmitting and receiving data to provide high-speed data communication and method thereof

In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used.

Method for digital system modeling by using higher software simulator

A digital system design method uses a higher programming language. In order to realize a digital system, an algorithm is verified based on a program written by the higher programming language and a program is programmed considering the higher programming language-hardware characteristics before the program is written in the lower programming language, and thus conversion into the lower programming language may be easily performed.

Apparatus for transmitting and receiving data to provide high-speed data communication and method thereof

In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used.

Transmitting apparatus of wireless communication system and method thereof

The present invention relates to a transmitting apparatus of a wireless communication system, and a method thereof. The transmitting apparatus monitors receiving of response data for data that has been transmitted to a receiving end, and sets a first parameter for counting successful receipts according to receiving on the response data. The transmitting apparatus demodulates the response data and extracts the number of demodulated data that satisfies a first set value. Subsequently, it is determined whether the first parameter satisfies a second set value and the number of demodulated data satisfies a predetermined ratio of a referential amount of packets. According to the present invention, an efficient transmission mode for a channel state can be provided with reference to an extracted number of soft-decision data from response data received at a receiving end. In addition, a transmission mode can be determined by using only response data according to the present invention.

Apparatus for transmitting and receiving data to provide high-speed data communication and method thereof

In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used.

Apparatus and method for transmitting/receiving data in communication system

A data transmission apparatus in a communication system includes a reception unit configured to receive terminal information from a plurality of terminals through a new frequency band for transmitting and receiving data between the plurality of terminals and one AP (access point); a verification unit configured to verify the terminal information, group the terminals into terminal groups by using the terminal information, and verify virtual APs which respectively correspond to the terminal groups, in the AP; and a transmission unit configured to transmit beacon frames in the virtual APs, to the terminals included in the terminal groups, wherein the beacon frames include beacon interval information, beacon duration information, beacon offset information, and terminal group information.

Apparatus and method for transmitting/receiving data in communication system

A data transmission apparatus in a communication system includes a reception unit configured to receive terminal information from a plurality of terminals through a new frequency band for transmission and reception of data between the plurality of terminals and an AP (access point); a determination unit configured to determine access timing of the terminals to the AP by using the terminal information, and generate terminal access information including information on the access timing; and a transmission unit configured to transmit the terminal access information and beacon frames to the terminals, wherein the terminals access the AP and transmit data frames to the AP, at the access timing based on the beacon frames.

Apparatus and method for receiving data in communication system

Disclosed is an apparatus for receiving data in a communication system, including: a receiving unit configured to receive data transmitted from an access point (AP) by a multi-input multi-output (MIMO) scheme; a detecting unit configured to detect a data stream of the received data using an LQ decomposition scheme; a generating unit configured to generate channel information regarding the data stream; and a transmitting unit configured to feedback the channel information to the AP.

Spatial multiplexing detection system and method for MIMO

A spatial multiplexing detection device using a MIMO technology comprises a MIMO detector for detecting receive symbols which correspond to symbols transmitted through transmit antennas from receive signals when the transmit data transmitted by the terminal group are received through receive antennas; a terminal identifier for identifying the receive symbols detected by the MIMO detector into symbols which correspond to respective terminals in the terminal group; a symbol demapper for demapping the receive symbols identified by the terminal identifier to binary data which correspond to a modulation method used by the terminal group; and a reverse data processor for performing deinterleaving, decoding of error correction codes, and descrambling on the binary data demapped by the symbol demapper, and detecting receive data of the respective terminals.

Apparatus and method for tracking residual frequency offset for single carrier-frequency domain equalizer system

A method for tracking a residual frequency offset for a single carrier-frequency domain equalizer system includes: determining a pilot from the data and known pilot data, adding the determined pilot to the leading part of the data, copying a part of the frame of the data after a block and adding it before the block, and generating a preamble to construct one frame; eliminating a cyclic prefix, processing signals per an FFT block, extracting the preamble, and performing an initial channel estimation; updating a channel estimation, performing channel compensation, receiving a pilot, calculating an average phase of all the pilots in one FFT block, updating the channel estimation, performing an IFFT operation, extracting data, and recovering the original digital signal from the data.

APPARATUS FOR TRANSMITTING AND RECEIVING DATA TO PROVIDE HIGH-SPEED DATA COMMUNICATION AND METHOD THEREOF

In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used.

Apparatus and method for transmitting/receiving data in communication system

A data transmission apparatus in a communication system includes a reception unit configured to receive terminal information from a plurality of terminals through a new frequency band for transmission and reception of data between the plurality of terminals and an AP (access point); a determination unit configured to determine access timing of the terminals to the AP by using the terminal information, and generate terminal access information including information on the access timing; and a transmission unit configured to transmit the terminal access information and beacon frames to the terminals, wherein the terminals access the AP and transmit data frames to the AP, at the access timing based on the beacon frames.

Apparatus for transmitting and receiving data to provide high-speed data communication and method thereof

In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used.

BEAM DIVISION MULTIPLE ACCESS SYSTEM AND METHOD FOR MOBILE COMMUNICATION SYSTEM

The present invention is related to a beam division multiple access system and a method thereof. The base station according to the present invention comprises a initial mobile station information receiver for receiving initial mobile station information that a mobile station omnidirectionally transmits in an initial communication step, a mobile station location and speed detector for detecting a location and a moving speed of the mobile station from the initial mobile station information, a downlink beam generator for generating a downlink beam based on the location and the moving speed of the mobile station transferred from the mobile station location and speed detector, and adjusting at least one of a width and a direction of each the downlink beam, and a downlink beam transmitter for transmitting the downlink beam generated by the downlink beam generator to the mobile station through a phase array antenna.

Method for encoding low density parity check codes using result of checking previously specified parity bits

There is provided to a method for encoding an LDPC (Low Density Parity Check) code using the result of checking a previously specified parity, including the steps of: forming a parity bit check matrix having a dual diagonal structure consisting of (N-K) rows for check nodes and (N-K) columns on the basis of the H matrix; calculating the values of all the parity bits by inserting a given binary value in sub-blocks, with the parity bit check matrix formed on the H matrix; if the values of the parity bits are incorrect, checking the parity bit corresponding to the sub-block located in the last part of the H matrix; searching the parity bit parts where the parity bit check result is represented as 1; performing an XOR operation in sub-blocks on the parity bit part obtained through a simultaneous equation between the parity bits of the searched parity bit parts and the parity bit parts; and determining the value of the parity bit satisfying the condition that the value obtained by multiplying ...

Transmitting and receiving systems for increasing service coverage in orthogonal frequency division multiplexing wireless local area network, and method thereof

The present invention relates to an orthogonal frequency division multiplexing wireless local area network (LAN) transmitting/receiving system for providing expanded service coverage, and a method thereof. A first OFDM modulation is performed for an even-numbered time, and a second OFDM modulation is performed for an odd-numbered time. A transmitting frame including a plurality of signal fields according to the first and second OFDM modulation is transmitted. The receiving system determines whether a signal field is repeatedly generated in the frame. If the signal field is not repeatedly generated, corresponding demodulation is performed. If repeatedly performed, the signal field is demodulated by using first bit allocation information and second bit allocation information having a ½ value of the first bit allocation information. A data field is demodulated according to the demodulated signal field.

Apparatus and method for tracking residual frequency offset for single carrier-frequency domain equalizer system

A method for tracking a residual frequency offset for a single carrier-frequency domain equalizer system includes: determining a pilot from the data and known pilot data, adding the determined pilot to the leading part of the data, copying a part of the frame of the data after a block and adding it before the block, and generating a preamble to construct one frame; eliminating a cyclic prefix, processing signals per an FFT block, extracting the preamble, and performing an initial channel estimation; updating a channel estimation, performing channel compensation, receiving a pilot, calculating an average phase of all the pilots in one FFT block, updating the channel estimation, performing an IFFT operation, extracting data, and recovering the original digital signal from the data.

Adaptive receiving system and method for MIMO

Disclosed is an adaptive receiving MIMO (multi input and multi output) system and method which decides a symbol detecting order so as to estimate the symbol having the minimum summation of weights of least square errors at the time of estimating the symbol for respective equalizers provided in parallel by the number of transmit antennas, and updates filter tap coefficients based on the RLS algorithm according to the detecting orders. Therefore, the filter tap coefficients are directly updated without tracking channels in the time-varying channel environment, and accordingly, detection performance very similar to those of the channel tracking and conventional V-BLAST scheme is provided with reduced complexity.

APPARATUS AND METHOD FOR RECEIVING DATA IN COMMUNICATION SYSTEM

Disclosed is an apparatus for receiving data in a communication system, including: a receiving unit configured to receive data transmitted from an access point (AP) by a multi-input multi-output (MIMO) scheme; a detecting unit configured to detect a data stream of the received data using an LQ decomposition scheme; a generating unit configured to generate channel information regarding the data stream; and a transmitting unit configured to feedback the channel information to the AP. 1. An apparatus for receiving data in a communication system , comprising:a receiving unit configured to receive data transmitted from an access point (AP) by a multi-input multi-output (MIMO) scheme;a detecting unit configured to detect a data stream of the received data using an LQ decomposition scheme;a generating unit configured to generate channel information regarding the data stream; anda transmitting unit configured to feedback the channel information to the AP.2. The apparatus for receiving data of claim 1 , wherein the receiving unit receives data transmitted from the AP through a wireless channel by a single user-MIMO scheme or a multi user-MIMO scheme.3. The apparatus for receiving data of claim 2 , wherein the detecting unit decomposes the received data into an L matrix in a low-triangular matrix form and a Q matrix in a unitary matrix form by using the LQ decomposition scheme.4. The apparatus for receiving data of claim 3 , wherein the transmitting unit feedbacks the Q matrix as the channel information to the AP.5. The apparatus for receiving data of claim 4 , wherein the AP performs beamforming so as to transmitting data by the MIMO scheme based on the Q matrix.6. The apparatus for receiving data of claim 5 , wherein an effective channel of the wireless channel is a unitary matrix×low-triangular matrix form by the single user-MIMO according to the beamforming.7. The apparatus for receiving data of claim 5 , wherein the effective channel of the wireless channel is a block ...

Transmitting and receiving systems for increasing service coverage in orthogonal frequency division multiplexing wireless local area network, and method thereof

The present invention relates to an orthogonal frequency division multiplexing wireless local area network (LAN) transmitting/receiving system for providing expanded service coverage, and a method thereof. A first OFDM modulation is performed for an even-numbered time, and a second OFDM modulation is performed for an odd-numbered time. A transmitting frame including a plurality of signal fields according to the first and second OFDM modulation is transmitted. The receiving system determines whether a signal field is repeatedly generated in the frame. If the signal field is not repeatedly generated, corresponding demodulation is performed. If repeatedly performed, the signal field is demodulated by using first bit allocation information and second bit allocation information having a ½ value of the first bit allocation information. A data field is demodulated according to the demodulated signal field.

Adaptive receiving system and method for MIMO

Disclosed is an adaptive receiving MIMO (multi input and multi output) system and method which decides a symbol detecting order so as to estimate the symbol having the minimum summation of weights of least square errors at the time of estimating the symbol for respective equalizers provided in parallel by the number of transmit antennas, and updates filter tap coefficients based on the RLS algorithm according to the detecting orders. Therefore, the filter tap coefficients are directly updated without tracking channels in the time-varying channel environment, and accordingly, detection performance very similar to those of the channel tracking and conventional V-BLAST scheme is provided with reduced complexity.

Apparatus for transmitting and receiving data to provide high-speed data communication and method thereof

In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used.

Adaptive receiving system and method for MIMO

Disclosed is an adaptive receiving MIMO (multi input and multi output) system and method which decides a symbol detecting order so as to estimate the symbol having the minimum summation of weights of least square errors at the time of estimating the symbol for respective equalizers provided in parallel by the number of transmit antennas, and updates filter tap coefficients based on the RLS algorithm according to the detecting orders. Therefore, the filter tap coefficients are directly updated without tracking channels in the time-varying channel environment, and accordingly, detection performance very similar to those of the channel tracking and conventional V-BLAST scheme is provided with reduced complexity.

Apparatus for transmitting and receiving data to provide high-speed data communication and method thereof

In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used.

Apparatus and method for transmitting/receiving data in communication system

A data transmission apparatus in a communication system includes a verification unit configured to verify a basic frequency band capable of being used for transmitting and receiving data to and from a plurality of terminals, and a multi-bandwidth mode in the basic frequency band; a generation unit configured to generate data packets in the multi-bandwidth mode; and a transmission unit configured to transmit the data packets in the multi-bandwidth mode, wherein the multi-bandwidth mode includes a ½× bandwidth of the basic frequency band, a basic bandwidth, a 2× bandwidth of the basic frequency band, a 4× bandwidth of the basic frequency band and an 8× bandwidth of the basic frequency band.

Spatial multiplexing detection system and method for MIMO

A spatial multiplexing detection device using a MIMO technology comprises a MIMO detector for detecting receive symbols which correspond to symbols transmitted through transmit antennas from receive signals when the transmit data transmitted by the terminal group are received through receive antennas; a terminal identifier for identifying the receive symbols detected by the MIMO detector into symbols which correspond to respective terminals in the terminal group; a symbol demapper for demapping the receive symbols identified by the terminal identifier to binary data which correspond to a modulation method used by the terminal group; and a reverse data processor for performing deinterleaving, decoding of error correction codes, and descrambling on the binary data demapped by the symbol demapper, and detecting receive data of the respective terminals.

Apparatus and method for allocating resource in communication system

A resource allocation apparatus in a communication system includes an identification unit configured to identify a new frequency band for transmission and reception of data between a plurality of terminals and a first access point, and identify a first frequency band which is being used by a second access point in the new frequency band; a setting unit configured to divide the new frequency band into sub bands of a basic frequency band, and set priorities of the sub bands; and an allocation unit configured to allocate the sub bands in correspondence to the priorities, for transmission and reception of data between the plurality of terminals and the first access point.

Apparatus for transmitting and receiving data to provide high-speed data communication and method thereof

In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used.

Method for digital system modeling by using higher software simulator

A digital system design method uses a higher programming language. In order to realize a digital system, an algorithm is verified based on a program written by the higher programming language and a program is programmed considering the higher programming language-hardware characteristics before the program is written in the lower programming language, and thus conversion into the lower programming language may be easily performed.

Apparatus for transmitting and receiving data to provide high-speed data communication and method thereof

In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used.

APPARATUS FOR RECEIVING SIGNALS IN OFDM COMMUNICATION SYSTEM HAVING MULTIPLE ANTENNAS AND METHOD THEREOF

Provided are an apparatus for receiving signals in an OFDM communication system using multiple transmission/reception antennas and a method thereof. The method includes modulating a predetermined part of a data stream based on a multi-dimensional reception procedure to generate a first modulated data stream; regenerating a symbol corresponding to the modulated data stream; eliminating the regenerated symbol from a remained data stream; modulating the eliminated data stream to generate a second modulated data stream; and outputting an output signal obtained by serializing the first modulated data stream and the second modulated data stream.

Method and device for tracking carrier frequency offset and sampling frequency offset in orthogonal frequency division multiplexing wireless communication system

A method for tracking carrier frequency and sampling frequency offsets in an OFDM wireless communication system comprises: (a) detecting data received from the transmitter using a first signal, and tracking a phase offset caused by the carrier frequency offset using the detected received data; (b) detecting the data received from the transmitter using the first signal, and tracking the phase offset caused by the sampling frequency offset using the detected received data; (c) compensating for the phase offset caused by the carrier frequency offset between the transmitter and the receiver according to the phase offset tracked in (a); and (d) compensating for the phase offset caused by the sampling frequency offset between the transmitter and the receiver according to the phase offset tracked in (b).

Apparatus for Transmitting and Receiving Data to Provide High-Speed Data Communication and Method Thereof

In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used.

Apparatus for Transmitting and Receiving Data to Provide High-Speed Data Communication and Method Thereof

In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used.

Apparatus and method for transmitting/receiving data in communication system

A data transmission apparatus in a communication system includes a verification unit configured to verify a basic frequency band capable of being used for transmitting and receiving data to and from a plurality of terminals, and a multi-bandwidth mode in the basic frequency band; a generation unit configured to generate data packets in the multi-bandwidth mode; and a transmission unit configured to transmit the data packets in the multi-bandwidth mode, wherein the multi-bandwidth mode includes a ½× bandwidth of the basic frequency band, a basic bandwidth, a 2× bandwidth of the basic frequency band, a 4× bandwidth of the basic frequency band and an 8× bandwidth of the basic frequency band. 1. A data transmission apparatus in a communication system , comprising:a verification unit configured to verify a basic frequency band capable of being used for transmitting and receiving data to and from a plurality of terminals, and a multi-bandwidth mode in the basic frequency band;a generation unit configured to generate data packets in the multi-bandwidth mode; anda transmission unit configured to transmit the data packets in the multi-bandwidth mode,wherein the multi-bandwidth mode includes a ½× bandwidth of the basic frequency band, a basic bandwidth, a 2× bandwidth of the basic frequency band, a 4× bandwidth of the basic frequency band and an 8× bandwidth of the basic frequency band.2. The data transmission apparatus of claim 1 , wherein the transmission unit divides the ½× bandwidth claim 1 , the basic bandwidth claim 1 , the 2× bandwidth claim 1 , the 4× bandwidth and the 8× bandwidth into sub-bands claim 1 , classifies the sub-bands into primary channels and secondary channels claim 1 , and transmits the data packets through the primary channels and the secondary channels.3. The data transmission apparatus of claim 1 , wherein the transmission unit transmits the data packets through subcarriers of a first half band and a second half band of the basic frequency band in ...

APPARATUS AND METHOD FOR TRANSMITTING/RECEIVING DATA IN COMMUNICATION SYSTEM

A data transmission apparatus in a communication system includes a reception unit configured to receive adjacent terminal information from a plurality of terminals through a new frequency band for transmission and reception of data between the terminals and one AP (access point); a verification unit configured to identify positions of the terminals within a service coverage of the AP through the adjacent terminal information, group the terminals into terminal groups through position-based grouping, and verify transmission possible times to the AP, in terminals included in the terminal groups; and a transmission unit configured to transmit the transmission possible times to the terminals included in the terminal groups through beacon frames in the AP, wherein, as the transmission possible times for the terminal groups, different time intervals are allocated in a beacon interval of the beacon frames. 1. A data transmission apparatus in a communication system , comprising:a reception unit configured to receive adjacent terminal information from a plurality of terminals through a new frequency band for transmission and reception of data between the terminals and one AP (access point);a verification unit configured to identify positions of the terminals within a service coverage of the AP through the adjacent terminal information, group the terminals into terminal groups through position-based grouping, and verify transmission possible times to the AP, in terminals included in the terminal groups; anda transmission unit configured to transmit the transmission possible times to the terminals included in the terminal groups through beacon frames in the AP,wherein, as the transmission possible times for the terminal groups, different time intervals are allocated in a beacon interval of the beacon frames.2. The data transmission apparatus of claim 1 , wherein the terminals of the terminal groups access the AP during the different time intervals claim 1 , and transmit and ...

Apparatus and method for transmitting/receiving data in communication system

A data transmission apparatus in a communication system includes a verification unit configured to verify a new frequency band for transmitting and receiving data to and from a plurality of terminals; a generation unit configured to generate a frame in the new frequency band; and a transmission unit configured to transmit data through the new frequency band by using the frame, wherein the frame includes data fields in which data corresponding to the terminals are included, and control fields in which control information for receiving the data included in the data field in the terminals is included, and wherein the control fields include a VHT-STF (very high throughput short training field), a VHT-SIG (very high throughput signal field) A 1, a VHT-SIG A 2, a plurality of VHT-LTFs (very high throughput long training fields), and a VHT-SIG B.

Apparatus and method for transmitting/receiving data in communication system

A data transmission apparatus in a communication system includes a reception unit configured to receive terminal information from a plurality of terminals through a new frequency band for transmitting and receiving data between the plurality of terminals and one AP (access point); a verification unit configured to verify the terminal information, group the terminals into terminal groups by using the terminal information, and verify virtual APs which respectively correspond to the terminal groups, in the AP; and a transmission unit configured to transmit beacon frames in the virtual APs, to the terminals included in the terminal groups, wherein the beacon frames include beacon interval information, beacon duration information, beacon offset information, and terminal group information.

APPARATUS AND METHOD FOR TRANSMITTING/RECEIVING DATA IN COMMUNICATION SYSTEM

A data transmission apparatus in a communication system includes a reception unit configured to receive terminal information from a plurality of terminals through a new frequency band for transmission and reception of data between the plurality of terminals and an AP (access point); a determination unit configured to determine access timing of the terminals to the AP by using the terminal information, and generate terminal access information including information on the access timing; and a transmission unit configured to transmit the terminal access information and beacon frames to the terminals, wherein the terminals access the AP and transmit data frames to the AP, at the access timing based on the beacon frames. 1. A data transmission apparatus in a communication system , comprising:a reception unit configured to receive terminal information from a plurality of terminals through a new frequency band for transmission and reception of data between the plurality of terminals and an AP (access point);a determination unit configured to determine access timing of the terminals to the AP by using the terminal information, and generate terminal access information including information on the access timing; anda transmission unit configured to transmit the terminal access information and beacon frames to the terminals,wherein the terminals access the AP and transmit data frames to the AP, at the access timing based on the beacon frames.2. The data transmission apparatus of claim 1 , wherein the terminal access information includes information on offsets claim 1 , periods and durations of the terminals.3. The data transmission apparatus of claim 2 , wherein the offsets mean a transmission starting time of a first data frame claim 2 , as standby time information to until the terminals transmit the first data frame from a reference beacon frame among the beacon frames.4. The data transmission apparatus of claim 3 ,wherein the periods mean periods with which the terminals ...

APPARATUS AND METHOD FOR ALLOCATING RESOURCE IN COMMUNICATION SYSTEM

A resource allocation apparatus in a communication system includes an identification unit configured to identify a new frequency band for transmission and reception of data between a plurality of terminals and a first access point, and identify a first frequency band which is being used by a second access point in the new frequency band; a setting unit configured to divide the new frequency band into sub bands of a basic frequency band, and set priorities of the sub bands; and an allocation unit configured to allocate the sub bands in correspondence to the priorities, for transmission and reception of data between the plurality of terminals and the first access point. 1. A resource allocation apparatus in a communication system , comprising:an identification unit configured to identify a new frequency band for transmission and reception of data between a plurality of terminals and a first access point, and identify a first frequency band which is being used by a second access point in the new frequency band;a setting unit configured to divide the new frequency band into sub bands of a basic frequency band, and set priorities of the sub bands; andan allocation unit configured to allocate the sub bands in correspondence to the priorities, for transmission and reception of data between the plurality of terminals and the first access point.2. The resource allocation apparatus of claim 1 , wherein the setting unit sets the priorities of the sub bands in consideration of interference between the first access point and the second access point in the new frequency band.3. The resource allocation apparatus of claim 2 , wherein the setting unit sets the priorities of the sub bands in correspondence to adjacencies and position separation distances with respect to the first frequency band.4. The resource allocation apparatus of claim 3 , wherein the setting unit sets a sub band most adjacent to the first frequency band among the sub bands claim 3 , to a lowest priority claim 3 ...

APPARATUS AND METHOD FOR EXTENDING COVERAGE IN WIRELESS COMMUNICATION SYSTEM

The present invention relates to an apparatus and method for coverage expansion in a wireless communication system. This disclosure discloses a wireless device operating in a wireless communication system, the wireless device comprising a transceiver transmitting and receiving a wireless signal and a processor operating in operative connection with the transceiver, wherein the processor sets power boosting adjustable in an RF capability range within an SIG field. 1. A wireless device operating in a wireless communication system , the wireless device comprising:a transceiver transmitting and receiving a wireless signal; anda processor operating in operative connection with the transceiver, wherein the processor sets power boosting adjustable in an RF capability range within an SIG field.2. The wireless device of claim 1 , wherein the processor uses at least one field included in the SIG field for setting the adjustable power boosting.3. The wireless device of claim 2 , wherein the at least one field includes an SGI field claim 2 , a coding field claim 2 , a Num SS field claim 2 , an STBC field claim 2 , and a reserved field.4. The wireless device of claim 2 , wherein the at least one field used for setting the power boosting includes one bit or two bits.5. The wireless device of claim 4 , wherein when the at least one field includes one bit claim 4 , if the bit is 0 claim 4 , this indicates that additional power boosting is 0 dB claim 4 , and if the bit is 1 claim 4 , this indicates that the additional power boosting is 3 dB.6. The wireless device of claim 4 , wherein when the at least one field includes two bits claim 4 , if the bits are 00 claim 4 , this indicates that additional power boosting is 0 dB claim 4 , if the bits are 01 claim 4 , this indicates that the additional power boosting is 3 dB claim 4 , if the bits are 10 claim 4 , this indicates that the additional power boosting is 6 dB claim 4 , and if the bits are 11 claim 4 , this indicates that the ...

APPARATUS AND METHOD OF INDICATING BANDWIDTH IN WIRELESS COMMUNICATION SYSTEM

The phase rotation relates to an apparatus and method of indicating a bandwidth in a wireless communication system. This disclosure discloses a wireless device comprising a transmission transmitting and receiving a wireless signal and a processor operating in operative connection with the transmission, wherein the processor generates a PPDU (physical protocol data unit) to which a phase rotation application is selectively applied depending on a case of bandwidth indication or a case of no bandwidth indication. 1. A wireless device comprising:a transmission transmitting and receiving a wireless signal; anda processor operating in operative connection with the transmission, wherein the processor generates a PPDU (physical protocol data unit) to which a phase rotation application is selectively applied depending on a case of bandwidth indication or a case of no bandwidth indication.2. The wireless device of claim 1 , wherein in the case of bandwidth indication claim 1 , the processor generates the PPDU to which the phase rotation application is not applied based on a TXVECTOR parameter denoting bandwidth exchange (BW_EXCHANGE).3. The wireless device of claim 1 , wherein the processor generates an SIG field including one bit of DYN_BANDWIDTH denoting that the bandwidth indication is dynamic or static.4. A method of performing a bandwidth indication by a wireless device in a wireless LAN system claim 1 , the method comprising:generating a PPDU (physical protocol data unit) to which a phase rotation application is selectively applied depending on a case of bandwidth indication or a case of no bandwidth indication; andtransmitting the PPDU.5. The method of claim 4 , wherein in the case of bandwidth indication claim 4 , the PPDU to which the phase rotation application is not applied is generated based on a TXVECTOR parameter denoting bandwidth exchange (BW_EXCHANGE).6. The method of claim 4 , further comprising generating an SIG field including one bit of DYN_BANDWIDTH ...

Access point apparatus for configuring next generation wireless communication network and method of operating the access point apparatus

Disclosed are an access point apparatus for configuring a next generation wireless communication and a method of operating the access point apparatus. The access point apparatus for configuring the next generation wireless communication may include a verification unit to verify a first available band associated with at least one of a first band and a second band; and a configuration unit to configure a backbone network with another access point apparatus positioned within a predetermined distance, through the verified first available band.

APPARATUS FOR TRANSMITTING AND RECEIVING DATA TO PROVIDE HIGH-SPEED DATA COMMUNICATION AND METHOD THEREOF

In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used. 19-. (canceled)10. A transmitter having plural antennas for transmitting a two-stream signal in a wireless channel , said transmitter having transmission circuits connected to each antenna , said transmission circuits comprising:frame generator circuits for producing in each stream of said two-stream signal transmission frames having a preamble followed by data, wherein said frame generator circuits providing signal information symbols in said preamble, said signal information symbols indicating whether said two-stream signal is coded using space time block coding (STBC).11. The transmitter of claim 10 , wherein said frame generator circuits further providing:preamble symbols representing a short preamble sequence and one or more first long preamble sequences located in said preamble before said signal information symbols, said short and first long preamble sequences enabling a receiver to perform an initial frame synchronization; andadditional preamble symbols representing one or more second long preamble sequences located in said preamble following said signal information symbols and enabling a receiver to perform a channel estimation for each channel defined by said two-stream signal.12. The transmitter of claim 11 , wherein the short preamble sequence ...

Method and apparatus for controlling channel access in wireless local area network (wlan) system

Disclosed are a method and apparatus for an access point (AP) to control channel access of a station in a wireless local area network (WLAN) system. An AP according to one embodiment may determine resource allocation information for protecting a resource for a station not referring to traffic indication map (TIM) information. The determined resource allocation information is transmitted to a station referring to the TIM information, and the station referring to the TIM information does not conduct channel access in a time period specified in the resource allocation information.

METHOD AND APPARATUS FOR ALLOCATING FLEXIBLE TRANSMISSION SLOT IN WIRELESS LAN SYSTEM

A method and an apparatus for allocating a flexible transmission slot in a wireless local area network (LAN) system are disclosed. A flexible transmission slot allocation method of an access point (AP) in a wireless local area network (WLAN) system according to an exemplary embodiment includes transmitting a beacon including a traffic indication map (TIM) bit to a station, receiving a power save poll (PS-Poll) from the station in a slot implicitly allocated by the TIM bit, and transmitting an acknowledgement (ACK) including transmission slot allocation information on downlink data to the station. 1. A method of uplink transmission by a station (STA) in a wireless local area network , the method comprising:receiving, from an access point (AP), an uplink soliciting frame including information on a plurality of an association identifier (AID) and information on resource allocation based on the AID, wherein each STA has its own AID and information on resource allocation includes information of each STA's resource allocation based on AID,wherein the uplink soliciting frame is transmitted by the AP without a request from the STA, and the uplink soliciting frame solicits the STA to report an amount of uplink data buffered at the STA, wherein the information indicating an amount of uplink data buffered at the STA is included in medium access control (MAC) header of the frame transmitted to the AP;in response to the uplink soliciting frame, transmitting, through an allocated resource based on the resource allocation included in the uplink soliciting frame, a first uplink transmission frame,receiving a data soliciting frame including information on the data transmission resource for the next transmission of the STA when the transmission for the remaining data of the STA is impossible based on the allocated resource; andtransmitting, using the data transmission resource indicated by the data soliciting frame for the next transmission of the STA, a second uplink transmission ...

APPARATUS AND METHOD FOR CONTROLLING SLOT USAGE

Provided is slot use control apparatus and method, including an access point (AP) to control a slotted channel access of a station (STA) in a wireless local area network (WLAN) includes generating a synchronization (synch) frame including an identification value indicating an STA allocated to a slot, and broadcasting the generated synch frame when a channel is in an idle state at a start point of the slot. 1. A slot use control method for an access point (AP) to control a slotted channel access of a station (STA) in a wireless local area network (WLAN) , the method comprising:generating a synchronization (synch) frame including an identification value indicating an STA allocated to a slot; andbroadcasting the generated synch frame when a channel is in an idle state at a start point of the slot.2. The method of claim 1 , wherein the generating comprises generating the synch frame by setting a receiver address (RA) value for a media access control (MAC) header.3. The method of claim 1 , wherein the generating comprises generating the synch frame by setting a receiver association identification (AID) value and a basic service set identification (BSSID) value to a short MAC (SM) header.4. The method of claim 1 , wherein the generating comprises generating the synch frame using a value of most significant bits (MSBs) of an AID value as the identification value when the station allocated to the slot corresponds to a station group including a plurality of STAs claim 1 , and when the station group is hierarchically divided using the AID value.5. The method of claim 4 , wherein a value of least significant bits (LSBs) of the AID value have identical patterns.6. The method of claim 1 , wherein the generating comprises generating the synch frame by setting an identification bit field to identify a group station and a unique station included in a station group when the station allocated to the slot corresponds to the station group including a plurality of STAs.7. The method of ...

Sensing device and method and system for information transfer thereof

An information transmission system includes a first sensing device configured to transmit a cooperation request signal, receive a cooperation response signal corresponding to the cooperation request signal, generate a jamming signal on the basis of the cooperation response signal, and generate and transmit a transmission signal including sensor information; an information collection device configured to receive the transmission signal transmitted by the first sensing device; and at least one second sensing device provided near the first sensing device, and configured to receive the cooperation request signal and transmit the cooperation response signal corresponding to the cooperation request signal to the first sensing device. The cooperation response signal includes channel information between the at least one second sensing device and the information collection device, and a seed for a random signal generator shared between the first sensing device and the at least one second sensing device.

Method for changing operating mode of wireless lan system and wireless lan system

An operating mode change method of a wireless local area network (WLAN) system according to an exemplary embodiment includes transmitting, by a station (STA) to an access point (AP), an operating mode change request frame comprising at least one of information on a change of a traffic indication map (TIM) mode, a request for a change of a power save parameter, and information on a change of a service type of the STA, receiving, from the AP, an operating mode change response frame comprising at least one of a TIM mode allowed by the AP, a reallocated association identification (AID), and information on a changed power save parameter, and performing at least one of the change of the TIM mode and the change of the power save parameter based on the information included in the operating mode change

Apparatus and method for controlling slot usage

Provided is slot use control apparatus and method, including an access point (AP) to control a slotted channel access of a station (STA) in a wireless local area network (WLAN) includes generating a synchronization (synch) frame including an identification value indicating an STA allocated to a slot, and broadcasting the generated synch frame when a channel is in an idle state at a start point of the slot.

SCANNING METHOD IN WIRELESS LAN SYSTEM AND SUPPORTING DEVICE THEREFOR

A scanning method performed by a station (STA) in a wireless LAN system is provided. The method comprises: transmitting a probe request frame; and receiving a short probe response frame from an access point (AP) as a response to the probe request frame. The short probe response frame includes service set ID (SSID) information or compressed SSID information of the AP. 1. A scanning method performed by a STA (station) in a wireless LAN system , the method comprising:transmitting a probe request frame; andreceiving a short probe response frame from an AP (access point) in response to the probe request frame,wherein the short probe response frame includes SSID (service set ID) information or compressed SSID information from the AP.2. The scanning method of claim 1 ,wherein the short probe response frame further includes full SSID present indication information, andwherein the full SSID present field indicates whether the short probe response frame includes the SSID information or the compressed SSID information.3. The scanning method of claim 2 ,wherein the probe request frame includes a probe response option information element indicating option information requested to be included in the short probe response frame.4. The scanning method of claim 3 ,wherein the probe response option information element includes at least one probe response option bitmap field, andwherein each bit of each probe response option bitmap indicates whether a request is made to include corresponding option information.5. The scanning method of claim 4 ,wherein each probe response option bitmap includes a bit set as at least one ‘1’ indicating that a request is made to include specific option information.6. The scanning method of claim 4 ,wherein a first probe response option bitmap field of the at least one probe response option bitmap includes,a first bit indicating whether a request is made to include the SSID information or the compressed SSID information in the short probe response frame; ...

METHOD AND TERMINAL FOR REQUESTING AND ACQUIRING INFORMATION RELATING TO CHANNEL ACCESS IN WIRELESS LAN, AND APPARATUS FOR PROVIDING INFORMATION RELATING TO CHANNEL ACCESS IN WIRELESS LAN

Provided are a terminal for requesting and acquiring information associated with a channel access in a wireless local area network (WLAN) and an apparatus for providing information associated with a channel access in a WLAN, and more particularly, the terminal for requesting and acquiring information associated with a channel access in a WLAN according to an example embodiment may verify whether a beacon is received during a predetermined beacon interval, transmit a group and slot information request signal when the beacon is verified not to be received, and receive a group and slot information response signal in response to the group and slot information request signal. 1. A terminal for requesting and acquiring information associated with a channel access in a wireless local area network (WLAN) , the terminal comprising:a verifier to verify whether a beacon is received during a predetermined beacon interval;a transmitter to transmit a group and slot information request signal when the beacon is verified not to be received; anda receiver to receive a group and slot information response signal in response to the group and slot information request signal from an access point (AP).2. The terminal of claim 1 , wherein the transmitter transmits a group and slot information request frame claim 1 , and the group and slot information request frame comprises an identifier indicating a request for information associated with a group identifier (ID) allocated for each restricted access window (RAW) claim 1 , and a start time of the RAW and an RAW duration.3. The terminal of claim 2 , wherein when a terminal is accessible for each slot allocated by the AP claim 2 , the group and slot information request frame comprises an identifier indicating a request for information associated with a slot allocated to the terminal and a duration of the allocated slot.4. The terminal of claim 1 , further comprising:an accessor to be synchronized with the AP based on a timestamp included in ...

SUPPORT OF FREQUENCY DIVERSITY MODE FOR BLOCK CODE BASED TRANSMISSION IN OFDMA

Transmitting a frame may include determining a numerology according to a channel bandwidth, indicating the numerology in a field of a frame, and transmitting the frame using the numerology. Receiving a frame may include receiving a preamble of a frame, determining a numerology using the preamble, and receiving later portions of the frame using the numerology. Transmitting a frame may include, for a transmission time slot, determining a value of a first subcarrier of a first Space-Time Stream (STS), determining a value of a second subcarrier of the first STS, and determining, according to complex conjugates or negative complex conjugates of the values of the first and second subcarriers of the first STS, respective values of second and first sub carriers of a second STS. Transmitting a constellation point of a frame may be performed using an orphan subcarrier pair. 1determining a channel bandwidth of the frame;determining a numerology of the frame according to the channel bandwidth;providing an indication according to the numerology in a field of the frame; andtransmitting the frame using the numerology.. A method for transmitting a frame using a wireless device, the method comprising: This application is a continuation of U.S. patent application Ser. No. 15/047,488, filed on Feb. 18, 2016, now U.S. Pat. No. 9,860,099, to issue on Jan. 2, 2018, which claims priority to and the benefit of U.S. Provisional Application No. 62/117,901, filed on Feb. 18, 2015, the entire contents of which are incorporated herein by reference.The technology described herein relates generally to wireless networking. More particularly, the technology relates generally to utilization of subcarriers in Orthogonal Frequency Division Multiplexing (OFDM) frames in a Wireless Local Area Network (WLAN).A WLAN is being standardized by the IEEE (Institute of Electrical and Electronics Engineers) Part under the name of “Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications.” ...

APPARATUS FOR TRANSMITTING AND RECEIVING DATA TO PROVIDE HIGH-SPEED DATA COMMUNICATION AND METHOD THEREOF

In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used. 19-. (canceled)10. An apparatus for generating and transmitting a frame in a wireless communication system , the apparatus comprising: a short preamble comprising a symbol for timing synchronization,', 'first and second long preambles subsequent to the short preamble,', 'a data field subsequent to the first and second long preambles, wherein the second long preamble provides reference for a receiving apparatus to form a channel estimate that allows the receiving apparatus to demodulate the data field, and', 'a signal symbol between the first long preamble and the second long preamble, wherein the signal symbol comprises information about coding rate, modulation, and space time block coding; and, 'a frame generator configured to generate a frame comprising 'wherein the first and second long preambles are time domain representations of a first and second long sequence, respectively, and wherein the first and second long sequences are generated based on a basic long sequence, and', 'a transmitter configured to transmit the frame to the receiving apparatus,'}wherein the basic long sequence comprises, as its elements, A×{1, 1, −1, −1, 1, 1, −1, 1, −1, 1, 1, 1, 1, 1, 1, −1, −1, 1, 1, −1, 1, −1, 1, 1, 1, 1, 0, 1, −1, −1, 1, 1, −1, 1, −1, 1, −1, −1, −1, −1, −1, 1, 1, − ...

APPARATUS FOR TRANSMITTING AND RECEIVING DATA TO PROVIDE HIGH-SPEED DATA COMMUNICATION AND METHOD THEREOF

In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used. 1. An apparatus for wireless communication , comprising:a first circuitry; and [ [ a first preamble,', 'a second and a third preambles positioned subsequent to the first preamble,', 'a first bit stream positioned between the second preamble and the third preamble, and', 'a data field positioned subsequent to the third preamble; and, 'generate a frame, the frame comprising, 'transmit the frame,, 'wherein the first circuitry, when instructions stored in the second circuitry is executed, is configured to, 'wherein the first bit stream comprises information indicating whether or not the frame is transmitted using space time block coding, the first bit stream comprising at least one bit,', 'wherein the third preamble comprises a fourth preamble and a fifth preamble,', 'wherein the second preamble is preceded by a guard interval having a length of 1.6 μsec, the first bit stream is preceded by a guard interval having a length of 0.8 μsec, the fourth preamble is preceded by a guard interval having a length of 0.8 μsec, fifth preamble is preceded by a guard interval having a length of 0.8 μsec, and the data field is preceded by a guard interval having a length of 0.8 μsec., 'a second circuitry coupled to the first circuitry,'}2. The apparatus of claim 1 , wherein the ...

Method and terminal for requesting and acquiring information relating to channel access in wireless lan, and apparatus for providing information relating to channel access in wireless lan

The present invention relates to a terminal for requesting and acquiring information relating to channel access in a wireless LAN, and to an apparatus for providing information relating to channel access in a wireless LAN. The terminal for requesting and acquiring information relating to channel access in a wireless LAN according to one embodiment of the invention verifies the reception of a beacon during a preset beacon interval, if it is verified that the beacon has not been received, transmits a group and slot information request signal, and receives, from an access point, a group and slot information response signal as a response to the group and slot information request signal.

Ofdm transmission method and device in wireless lan system

An apparatus and method for orthogonal frequency division multiplexing (OFDM) transmission in a wireless local area network (WLAN) system is disclosed, in which the apparatus for OFDM transmission in the WLAN system includes a signal repetition unit to repeat an encoded signal based on a block unit and output the encoded signal and a repeated signal, an interleaver to interleave the encoded signal and the repeated signal and output an interleaved signal, a modulator to modulate the interleaved signal and output modulated symbols, and a phase rotation unit to phase shift the modulated symbols.

APPARATUS FOR TRANSMITTING AND RECEIVING DATA TO PROVIDE HIGH-SPEED DATA COMMUNICATION AND METHOD THEREOF

In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used. 1. A device configured to be used in a terminal in a wireless communication , the device comprising: [ a first preamble,', 'a second and a third preambles positioned subsequent to the first preamble,', 'a first bit stream positioned between the second preamble and the third preamble, and', 'a data field positioned subsequent to the third preamble; and, 'cause the terminal to generate a frame, the frame comprising, 'cause the terminal to transmit the frame,', the first bit stream comprises information about whether or not the frame is transmitted using space time block coding, the first bit stream comprising at least one bit,', 'the third preamble comprises a fourth preamble and a fifth preamble, and', 'the second preamble is preceded by a guard interval having a length of 1.6 μsec, the first bit stream is preceded by a guard interval having a length of 0.8 μsec, the fourth preamble is preceded by a guard interval having a length of 0.8 μsec, fifth preamble is preceded by a guard interval having a length of 0.8 μsec, and the data field is preceded by a guard interval having a length of 0.8 μsec., 'wherein], 'a unit configured to2. The device of claim 1 , wherein the first and second preambles are time domain representations of a first and second sequence claim 1 ...

COMMUNICATION METHOD AND COMMUNICATION DEVICE FOR SUPPORTING A PLURALITY OF BASIC BANDWIDTH MODES IN WIRELESS LAN SYSTEM THAT SUPPORTS MULTIPLE BANDWIDTHS

Provided is an apparatus and method for supporting a plurality of basic bandwidth modes in a wireless local area network (WLAN) system supporting a multi-bandwidth, wherein a communication method of an access point (AP) in a WLAN system includes verifying an operational status of a network by an AP included in the network supporting a first bandwidth and a second bandwidth two times greater than the first bandwidth, allocating a first time slot in which a transmission of a frame with at least the first bandwidth is allowed, based on the operational status of the network, and allocating a second time slot in which a transmission of a frame with at least the second bandwidth is allowed, based on the operational status of the network. 1. A communication method of an access point (AP) in a wireless local area network (WLAN) system , the method comprising:verifying an operational status of a network by an AP included in the network supporting a first bandwidth and a second bandwidth two times greater than the first bandwidth;allocating a first time slot in which a transmission of a frame with at least the first bandwidth is allowed, based on the operational status of the network; andallocating a second time slot in which a transmission of a frame with at least the second bandwidth is allowed, based on the operational status of the network.2. The method of claim 1 , wherein the allocating of the first time slot comprises restricting a channel access of stations (STAs) transmitting the frame with at least the second bandwidth claim 1 , using a frame of the second bandwidth claim 1 , and providing notification of a start of the first time slot using a frame of the first bandwidth.3. The method of claim 2 , wherein the allocating of the second time slot comprises providing notification of a termination of the first time slot using a frame of the first bandwidth claim 2 , and providing notification of a start of the first time slot using a frame of the first bandwidth.4. The ...

Communication method and communication device using open-loop link in wireless lan system that supports multi-bandwidth

A communication method and a communication apparatus using an open-loop link in a wireless local area network (WLAN) system supporting a multi-bandwidth are disclosed. A communication method using an open-loop link according to an exemplary embodiment includes a transmission apparatus of a WLAN system to support a multi-bandwidth, receiving link margin information on each of a plurality of bandwidths from a reception apparatus, acquiring a margin for a signal-to-noise ratio (SNR) based on the link margin information and determining a modulation and coding scheme (MCS) and a bandwidth for use based on the margin for the SNR, and transmitting data to the reception apparatus using the determined MCS and bandwidth.

Ofdm transmission method and device in wireless lan system

An apparatus and method for orthogonal frequency division multiplexing (OFDM) transmission in a wireless local area network (WLAN) system is disclosed, in which the apparatus for OFDM transmission in the WLAN system includes a signal repetition unit to repeat an encoded signal based on a block unit and output the encoded signal and a repeated signal, an interleaver to interleave the encoded signal and the repeated signal and output an interleaved signal, a modulator to modulate the interleaved signal and output modulated symbols, and a phase rotation unit to phase shift the modulated symbols.

SCANNING METHOD IN WIRELESS LAN SYSTEM AND SUPPORTING DEVICE THEREFOR

A scanning method performed by a station (STA) in a wireless LAN system is provided. The method comprises: transmitting a probe request frame; and receiving a short probe response frame from an access point (AP) as a response to the probe request frame. The short probe response frame includes service set ID (SSID) information or compressed 1. A scanning method performed by a STA (station) in a wireless LAN system , the method comprising:generating a probe request frame that includes a probe response option information element indicating whether SSID (service set ID) information or compressed SSID information is included in a short probe response frame,transmitting the probe request frame to an AP (access point); andreceiving the short probe response frame from the AP in response to the probe request frame including the probe response option information element,wherein the probe response option information element includes at least one probe response option bitmap field, andwherein each bit of each probe response option bitmap indicates whether a request is made to include corresponding option information.2. The method of claim 1 ,wherein the probe response option bitmap field is included in the probe response option information element only when at least one bit of the bitmap is set to indicate a request is made to include corresponding option information.3. The method of claim 2 , wherein the probe response option information element further includes a probe response group bitmap field to indicate which probe response option bitmap is included in the short probe response frame claim 2 , andwherein the bit in the probe response group bitmap field corresponding to the probe response option bitmap field is set to indicate that the corresponding probe response option bitmap is included in the probe response option information element.4. The method of claim 3 ,wherein if only a probe response option bitmap field corresponding to a default bitmap is included in the probe ...

Access point apparatus for configuring next generation wireless communication network and method of operating the access point apparatus

Disclosed are an access point apparatus for configuring a next generation wireless communication and a method of operating the access point apparatus. The access point apparatus for configuring the next generation wireless communication may include a verification unit to verify a first available band associated with at least one of a first band and a second band; and a configuration unit to configure a backbone network with another access point apparatus positioned within a predetermined distance, through the verified first available band.

METHOD FOR CHANGING OPERATING MODE OF WIRELESS LAN SYSTEM AND WIRELESS LAN SYSTEM

An operating mode change method of a wireless local area network (WLAN) system according to an exemplary embodiment includes transmitting, by a station (STA) to an access point (AP), an operating mode change request frame comprising at least one of information on a change of a traffic indication map (TIM) mode, a request for a change of a power save parameter, and information on a change of a service type of the STA, receiving, from the AP, an operating mode change response frame comprising at least one of a TIM mode allowed by the AP, a reallocated association identification (AID), and information on a changed power save parameter, and performing at least one of the change of the TIM mode and the change of the power save parameter based on the information included in the operating mode change response frame. 1. An operating mode change method of a wireless local area network (WLAN) system , the method comprising:transmitting, by a station (STA) to an access point (AP), an operating mode notification frame comprising information on a used bandwidth, information on a number of spatial streams, and information on a change of a traffic indication map (TIM) mode;receiving, from the AP, an operating mode change response frame comprising information on a reallocated association identification (AID) of the STA; andperforming the change of the TIM mode based on the information included in the operating mode change response frame.2. The method of claim 1 , wherein the operating mode change response frame further comprises group change information by the change of the TIM mode when the change of the TIM mode is approved by the AP.3. The method of claim 1 , wherein the operating mode change response frame comprises the AID reallocated by the AP due to the change of the TIM mode and a changed power save parameter corresponding to a listen interval or a wakeup interval of an STA readjusted by the AP when the TIM mode change is approved by the AP.4. The method of claim 1 , ...

Method and apparatus for allocating flexible transmission slot in wireless lan system

A method and an apparatus for allocating a flexible transmission slot in a wireless local area network (LAN) system are disclosed. A flexible transmission slot allocation method of an access point (AP) in a wireless local area network (WLAN) system according to an exemplary embodiment includes transmitting a beacon including a traffic indication map (TIM) bit to a station, receiving a power save poll (PS-Poll) from the station in a slot implicitly allocated by the TIM bit, and transmitting an acknowledgement (ACK) including transmission slot allocation information on downlink data to the station.

COMMUNICATION METHOD AND COMMUNICATION DEVICE IN WIRELESS LAN SYSTEM THAT SUPPORTS MULTI-BANDWIDTH

Provided is an apparatus and method for communication in a wireless local area network (LAN) system supporting a multi-bandwidth in which a communication apparatus supporting a multi-bandwidth includes generating a base frame based on at least one of a first bandwidth having the lowest signal-to-noise ratio (SNR) among predetermined bandwidths and a second bandwidth that is two times greater than the first bandwidth, configuring a duplication mode frame based on the base frame, and transmitting the duplication mode frame through a plurality of bands. 1. A communication method of a wideband wireless local area network (WLAN) system , the method comprising:generating, by a communication apparatus of a network supporting a multi-bandwidth, a base frame based on at least one of a first bandwidth having the lowest signal-to-noise ratio (SNR) among predetermined bandwidths and a second bandwidth that is two times greater than the first bandwidth;configuring a duplication mode frame based on the base frame; andtransmitting the duplication mode frame through a plurality of bands.2. The method of claim 1 , wherein the communication apparatus selects the first bandwidth or the second bandwidth based on types of terminals included in the network or distances from the terminals.3. The method of claim 2 , wherein the bandwidth selection is performed based on at least one of a number of terminals using the first bandwidth claim 2 , a distance from the communication apparatus claim 2 , and coverage of the communication apparatus.4. The method of claim 1 , wherein terminals included in the network are capable of demodulating both a base frame generated based on the first bandwidth and a base frame generated based on the second bandwidth.5. The method of claim 1 , wherein the duplication mode frame comprises a base frame and a duplication frame having a phase different from a phase of the base frame claim 1 , and the base frame comprises a short training field (STF) claim 1 , a long ...

APPARATUS AND METHOD FOR CONTROLLING TRANSMISSION SCHEDULE FOR BUFFERED DATA IN WIRELESS LAN, AND TERMINAL FOR RECEIVING BUFFERED DATA BASED ON TRANSMISSION SCHEDULE IN WIRELESS LAN

Disclosed is a technology that enables an access point, configured to manage a network, to control a transmission schedule of buffered data and enables a terminal to obtain information associated with the transmission schedule in a wireless local area network (WLAN) environment. An apparatus for controlling a transmission schedule of buffered data in a WLAN according to an embodiment may group terminals based on at least one of a service characteristic and a traffic characteristic of each of the terminals, assign group information to each of the grouped groups to wake up in a different time, and transmit at least one of delivery traffic indication map (DTIM) information and the buffered data based on the assigned group information. 1. An apparatus for controlling a transmission schedule of buffered data in a wireless local area network (WLAN) , the apparatus comprising:a grouping unit to group terminals based on at least one of a service characteristic and a traffic characteristic of each of the terminals;a group information assigner to assign group information to each of the grouped groups to wake up in a different time; anda transmitter to transmit at least one of group delivery traffic indication map (DTIM) information and the buffered data based on the assigned group information.2. The apparatus of claim 1 , wherein the grouping unit groups the terminals based on an association ID (AID) associated with a traffic indication map (TIM) indicating whether a buffered frame is present at an access point.3. The apparatus of claim 1 , wherein the grouping unit groups again terminals included in a grouped group into subgroups each including a predetermined number of terminals or less.4. The apparatus of claim 1 , wherein the group information assigner comprises:a transmission interval determiner to determine a transmission interval of a group DTIM to be different between groups, the group DTIM indicating whether buffered data corresponding to a terminal belonging to a ...

OFDM TRANSMISSION METHOD AND DEVICE IN WIRELESS LAN SYSTEM

An apparatus and method for orthogonal frequency division multiplexing (OFDM) transmission in a wireless local area network (WLAN) system is disclosed, in which the apparatus for OFDM transmission in the WLAN system includes a signal repetition unit to repeat an encoded signal based on a block unit and output the encoded signal and a repeated signal, an interleaver to interleave the encoded signal and the repeated signal and output an interleaved signal, a modulator to modulate the interleaved signal and output modulated symbols, and a phase rotation unit to phase shift the modulated symbols. 1. An apparatus for an orthogonal frequency division multiplexing (OFDM) transmission in a wireless local area network (WLAN) system , the apparatus comprising:a signal repetition unit to repeat an encoded signal based on a block unit and output the encoded signal and a repeated signal;an interleaver to interleave the encoded signal and the repeated signal and output an interleaved signal;a modulator to modulate the interleaved signal and output modulated symbols; anda phase rotation unit to phase shift the modulated symbols.2. The apparatus of claim 1 , wherein the phase rotation unit maintains phase of symbols obtained by modulating the encoded signal among the modulated symbols claim 1 , and phase shifts symbols obtained by modulating the repeated signal among the modulated symbols.3. The apparatus of claim 2 , wherein the phase rotation unit claim 2 , among the symbols obtained by modulating the repeated signal claim 2 , maintains phase of a portion of symbols and phase shifts remaining symbols.4. The apparatus of claim 1 , wherein the phase rotation unit phase shifts the modulated symbols by 45 degrees (°) claim 1 , 90° claim 1 , 135° claim 1 , or 180°.5. The apparatus of claim 1 , wherein the encoded signal comprises data used for a bandwidth mode having a lowest signal-to-noise ratio (SNR) among a plurality of bandwidths supported in the WLAN system.6. The apparatus of ...

APPARATUS AND METHOD FOR TRANSMITTING/RECEIVING DATA IN COMMUNICATION SYSTEM

A data transmission apparatus in a communication system includes a reception unit configured to receive terminal information from a plurality of terminals through a new frequency band for transmission and reception of data between the plurality of terminals and an AP (access point); a determination unit configured to determine access timing of the terminals to the AP by using the terminal information, and generate terminal access information including information on the access timing; and a transmission unit configured to transmit the terminal access information and beacon frames to the terminals, wherein the terminals access the AP and transmit data frames to the AP, at the access timing based on the beacon frames. 1. A method for accessing of a station (STA) in a wireless local area network , the method comprising:receiving, by the STA from an access point (AP), information on a periodic time duration within which the STA is allowed to access; andtransmitting, by the STA to the AP, a frame within the periodic time duration,wherein the information on the periodic time duration includes an offset with respect to a beacon frame and a periodicity, andwherein a wakeup timing of the STA is included within the periodic time duration.2. The method of claim 1 , wherein the offset indicates a start time of the periodic time duration after a transmission of the beacon frame from the AP.3. The method of claim 1 ,wherein the STA is included in a group of STAs which is allowed to access according to the information on the periodic time duration.4. The method of claim 3 ,wherein other STAs which are not included in the group of the STAs are not allowed to access within the periodic time duration.5. A method for allowing access of a station (STA) in a wireless local area network claim 3 , the method comprising:transmitting, by an access point (AP) to the STA, information on a periodic time duration within which the STA is allowed to access; andreceiving, by the AP from the STA, a ...

METHOD FOR DIRECT COMMUNICATION BETWEEN STATIONS IN WIRELESS LOCAL AREA SYSTEM

Disclosed is a method for direct communication between stations. The method for direct communication between stations may include: receiving scheduling information on a frequency selective transmission (FST) from an access point; setting up a link for communication with another station based on the scheduling information; and communicating with the other station using the link. 1. A method for direct communication between stations performed by a station , the method comprising:receiving scheduling information on a frequency selective transmission from an access point;setting up a link for communication with another station based on the scheduling information; andcommunicating with the other station using the link.2. The method of claim 1 , wherein the setting up comprises:identifying at least one subchannel unused for the frequency selective transmission based on the scheduling information; anddetermining a subchannel for communication with the other station among the at least one subchannel.3. The method of claim 2 , wherein the determining comprises setting a subchannel least affected by interference among the at least one subchannel claim 2 , as the link for communication with the other station.4. The method of claim 1 , wherein the setting up comprises:setting priorities of subchannels unused for the frequency selective transmission based on the scheduling information; anddetermining a subchannel to be used for communication with the other station based on the set priorities.5. The method of claim 1 , wherein the setting up comprises:sharing a list of subchannels available for communication with the other station with the other station; anddetermining a subchannel to be used for communication with the other station through negotiation with the other station.6. The method of claim 1 , wherein the setting up comprises setting claim 1 , as the link for communication with the other station claim 1 , a subchannel orthogonal to a subchannel used for the frequency ...

SCANNING METHOD IN WIRELESS LAN SYSTEM AND SUPPORTING DEVICE THEREFOR

A scanning method performed by a station (STA) in a wireless LAN system is provided. The method comprises: transmitting a probe request frame; and receiving a short probe response frame from an access point (AP) as a response to the probe request frame. The short probe response frame includes service set ID (SSID) information or compressed SSID information of the AP. 1. A scanning method performed by an access point (AP) in a wireless local area network system , the method comprising:receiving, from a station (STA), a first type probe request frame; andtransmitting, to the STA, a first type probe response frame or a second type probe response frame in response to the first type probe request frame, the first type probe response frame having a shorter length than the second type probe response frame,wherein the first type probe request frame includes a field indicating whether the STA request the first type probe response frame or the second type probe response frame.2. The method according to claim 1 ,wherein the first type probe response frame is transmitted to the STA when a bit value of the field is set to a first value, andwherein the second type probe response frame is transmitted to the STA when the bit value of the field is set to a second value.3. The method according to claim 1 ,wherein, when additional information is required by the STA after receiving the first type probe response frame, the STA acquires the additional information by receiving a full beacon frame.4. The method according to claim 1 ,wherein, when additional information is required by the STA after receiving the first type probe response frame, the STA transmits a second type probe request frame to the AP.5. The method according to claim 1 ,wherein the first type probe request frame is a null data packet (NDP) type probe request frame.6. A scanning method performed by a station (STA) in a wireless local area network system claim 1 , the method comprising:transmitting, to an access point (AP ...

APPARATUS AND METHOD FOR TRANSMITTING/RECEIVING DATA IN COMMUNICATION SYSTEM

A data transmission apparatus in a communication system includes a reception unit configured to receive terminal information from a plurality of terminals through a new frequency band for transmission and reception of data between the plurality of terminals and an AP (access point); a determination unit configured to determine access timing of the terminals to the AP by using the terminal information, and generate terminal access information including information on the access timing; and a transmission unit configured to transmit the terminal access information and beacon frames to the terminals, wherein the terminals access the AP and transmit data frames to the AP, at the access timing based on the beacon frames. 120-. (canceled)21. A data reception apparatus in a communication system , comprising:a generation unit configured to generate terminal information in a frequency band for transmission and reception of data between a plurality of terminals and an AP (access point);a transmission unit configured to transmit the terminal information to the AP;a reception unit configured to receive beacon frames through the frequency band, and receive terminal access information corresponding to the terminal information; anda verification unit configured to verify access timing to the AP based on the beacon frames by using the terminal access information,wherein the transmission unit accesses the AP at the access timing and transmits data frames to the AP.22. The data reception apparatus of claim 21 , wherein the transmission unit transmits a first data frame during a duration after lapse of an offset included in the terminal access information claim 21 , from a reference beacon frame among the beacon frames claim 21 , and claim 21 , after transmitting the first data frame claim 21 , periodically transmits the data frames during the duration according to the access timing included in the terminal access information.23. The data reception apparatus of claim 21 , wherein the ...

Apparatus and method for controlling slot usage

Provided is slot use control apparatus and method, including an access point (AP) to control a slotted channel access of a station (STA) in a wireless local area network (WLAN) includes generating a synchronization (synch) frame including an identification value indicating an STA allocated to a slot, and broadcasting the generated synch frame when a channel is in an idle state at a start point of the slot.

METHOD AND APPARATUS FOR CONTROLLING CHANNEL ACCESS IN WIRELESS LOCAL AREA NETWORK (WLAN) SYSTEM

Disclosed are a method and apparatus for an access point (AP) to control channel access of a station in a wireless local area network (WLAN) system. An AP according to one embodiment may determine resource allocation information for protecting a resource for a station not referring to traffic indication map (TIM) information. The determined resource allocation information is transmitted to a station referring to the TIM information, and the station referring to the TIM information does not conduct channel access in a time period specified in the resource allocation information. 1. A method of controlling channel access performed by an access point (AP) in a wireless local area network (WLAN) system , the method comprising:determining resource allocation information for protecting a resource for a first station not referring to traffic indication map (TIM) information from a second station referring to the TIM information; andbroadcasting the resource allocation information.2. The method of claim 1 , wherein the first station requests protection of the resource when requesting the resource to the AP.3. The method of claim 2 , wherein the first station transmits a bit value indicating whether protection of the resource is requested to the AP whenever requesting the resource.4. The method of claim 3 , wherein the bit value indicating whether protection of the resource is requested is transmitted claim 3 , being comprised in a control field or a request type field of a target wake time (TWT) element.5. The method of claim 2 , wherein the first station is a TWT station claim 2 , and the resource is a TWW resource.6. The method of claim 1 , further comprising transmitting response data indicating whether a requested resource is protected to the first station when a request for the resource is received from the first station.7. The method of claim 1 , wherein the determining of the resource allocation information comprises determining resource allocation information for ...

METHOD FOR CHANGING OPERATING MODE OF WIRELESS LAN SYSTEM AND WIRELESS LAN SYSTEM

An operating mode change method of a wireless local area network (WLAN) system according to an exemplary embodiment includes transmitting, by a station (STA) to an access point (AP), an operating mode change request frame comprising at least one of information on a change of a traffic indication map (TIM) mode, a request for a change of a power save parameter, and information on a change of a service type of the STA, receiving, from the AP, an operating mode change response frame comprising at least one of a TIM mode allowed by the AP, a reallocated association identification (AID), and information on a changed power save parameter, and performing at least one of the change of the TIM mode and the change of the power save parameter based on the information included in the operating mode change 1. A method for dynamic association identifier (AID) assignment operation in a wireless local area network , the method comprising:transmitting, by a station (STA) to an access point (AP), a request frame including information indicating whether information on a service type of the STA is included in the request frame or not;receiving, by the STA from the AP, a response frame comprising information on AID for the STA allocated by the AP and information on a listen interval for the STA allocated by the AP; andperforming an operation based on the information on the AID included in the response frame.2. The method of claim 1 ,wherein the request frame further includes at least one of information on a change of traffic indication map (TIM) modes, information on a change of a listen interval, or information on a change of a service type of a STA.3. The method of claim 2 ,wherein the change of TIM modes includes a switch from a TIM mode to a non-TIM mode, or a switch from the non-TIM mode to the TIM mode.4. The method of claim 2 ,further comprising receiving, by the STA from the AP, an operating mode notification frame comprising information on a change of an operating mode of the ...

METHOD FOR CHANGING OPERATING MODE OF WIRELESS LAN SYSTEM AND WIRELESS LAN SYSTEM

An operating mode change method of a wireless local area network (WLAN) system according to an exemplary embodiment includes transmitting, by a station (STA) to an access point (AP), an operating mode change request frame comprising at least one of information on a change of a traffic indication map (TIM) mode, a request for a change of a power save parameter, and information on a change of a service type of the STA, receiving, from the AP, an operating mode change response frame comprising at least one of a TIM mode allowed by the AP, a reallocated association identification (AID), and information on a changed power save parameter, and performing at least one of the change of the TIM mode and the change of the power save parameter based on the information included in the operating mode change 1. A method of a wireless local area network (WLAN) system , the method comprising:transmitting, by a station (STA) to an access point (AP), a request frame comprising information on a sector reallocation;receiving, from the AP, a response frame comprising information on a reallocated sector of the STA; andperforming the change of an operating mode based on the information included in the response frame.2. The method of claim 1 , wherein the response frame further comprises information on a sector group reallocation.3. The method of claim 2 , wherein the information on the sector group reallocation comprises at least one of a sector ID and group ID.4. The method of claim 1 , wherein the response frame further comprises information on a changed sector transmission duration.5. The method of claim 1 , wherein when the AP receives an association request including the information included in the request frame from the STA claim 1 , the AP determines whether to associate with the STA claim 1 , and transmits an association response including the information included in the response frame to the STA claim 1 , if association is allowed claim 1 , so that the STA sets up the operating ...

SCANNING METHOD IN WIRELESS LAN SYSTEM AND SUPPORTING DEVICE THEREFOR

A scanning method performed by a station (STA) in a wireless LAN system is provided. The method comprises: transmitting a probe request frame; and receiving a short probe response frame from an access point (AP) as a response to the probe request frame. The short probe response frame includes service set ID (SSID) information or compressed SSID information of the AP. 1. A scanning method performed by a station (STA) in a wireless local area network system , the method comprising:transmitting, to an access point (AP) a first probe request frame; andreceiving, from the AP, a first probe response frame or a second probe response frame in response to the first probe request frame, the first probe response frame having a shorter length than the second probe response frame,wherein the first probe request frame includes probe response option information,wherein the probe response option information includes at least one group of information that indicates which optional information is requested to be included or not included in the first probe response frame.2. The method according to claim 1 , wherein the at least one group of information includes at least one of:information indicating whether next beacon transmission time information is requested or not,information indicating whether full Service Set Identifier (SSID) information is requested or compressed SSID information is requested,information indicating whether Access Network Options is requested or not,information indicating whether S1G Beacon Compatibility is requested or not,information indicating whether S1G Capability is requested or not, orinformation indicating whether Request Supported Rates is requested or not.3. The method according to claim 1 , wherein the at least one group of information includes at least one of:information indicating whether RPS (RAW parameter set) is requested or not, orinformation indicating whether Short Beacon Interval is requested or not.4. The method according to claim 1 , ...

APPARATUS FOR TRANSMITTING AND RECEIVING DATA TO PROVIDE HIGH-SPEED DATA COMMUNICATION AND METHOD THEREOF

In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used. 1. An apparatus for wireless communication , comprising:a processor; and wherein the processor, when instructions stored in the memory is executed, is configured to:', a first preamble,', 'a second and a third preambles positioned subsequent to the first preamble,', 'a first bit stream positioned between the second preamble and the third long preamble, and', 'a data field positioned subsequent to the third preamble; and, 'generate a frame, the frame comprising, 'wherein the first bit stream comprises information indicating whether or not the frame is transmitted using space time block coding, the first bit stream comprising at least one bit.', 'transmit the frame,'}], 'a memory coupled to the processor,'}2. The apparatus of claim 1 , wherein the third preamble comprises a fourth preamble and a fifth preamble.3. The apparatus of claim 2 , wherein the second preamble is preceded by a guard interval having a length of 1.6 μsec claim 2 , each of the fourth and fifth long preambles is respectively preceded by a guard interval having a length of 0.8 μsec claim 2 , and the data field is preceded by a guard interval having a length of 0.8 μsec. This application is a continuation of U.S. application Ser. No. 12/401,293, filed Mar. 10, 2009, which is a continuation of ...

DEVICE AND METHOD FOR CONTROLLING SLOT-BASED CHANNEL ACCESS IN WIRELESS LAN SYSTEM, AND SLOT-BASED CHANNEL ACCESS TERMINAL IN WIRELESS LAN

An apparatus and a method of controlling slot-based channel access by an access point (AP) to manage a network in a wireless local area network (WLAN) environment and a slot-based channel access terminal are disclosed. A slot-based channel access control apparatus of a WLAN system according to an exemplary embodiment determines one of each terminal and a group of terminals as a slot allocation target, allocates a slot defined in a beacon interval to the determined terminal or group to distinguish channel access time, and transmits a beacon including information on the allocated slot. 1. A method for channel access of an access point (AP) in a wireless local area network (WLAN) , the method comprising:sensing whether a channel is idle; andtransmitting a first frame to a STA to allow the STA to access the channel when the channel is idle;wherein the first frame is a Null Data Packet (NDP) Clear-To-Send (CTS) frame.2. The method of claim 1 ,wherein the STA performs channel access when the STA receives the NDP CTS frame.3. The method of claim 2 ,wherein the NDP CTS frame is used as a trigger and a synchronization.4. The method of claim 2 ,wherein the STA transmits a frame to the AP after the STA performs the channel access.5. The method of claim 1 ,wherein the NDP CTS frame includes a Short Training Field (STF) field, a Long Training Field (LTF) field and, a Signal (SIG) field without a Data field, andwherein the SIG field includes scheduling information.6. The method of claim 5 ,wherein the SIG field includes information on at least one of a partial association identifier (AID) or a partial basic service set identifier (BSSID) as a CTS ID.7. The method of claim 5 ,wherein the SIG field includes information on a duration, the duration indicates scheduled time.8. The method of claim 1 ,wherein a time point when the STA wakes up corresponds to at least one of a slot boundary of time slots allocated to the STA or a target wake time (TWT) for the STA.9. An access point (AP) ...

Device and method for controlling slot-based channel access in wireless lan system, and slot-based channel access terminal in wireless lan

An apparatus and a method of controlling slot-based channel access by an access point (AP) to manage a network in a wireless local area network (WLAN) environment and a slot-based channel access terminal are disclosed. A slot-based channel access control apparatus of a WLAN system according to an exemplary embodiment determines one of each terminal and a group of terminals as a slot allocation target, allocates a slot defined in a beacon interval to the determined terminal or group to distinguish channel access time, and transmits a beacon including information on the allocated slot.

APPARATUS FOR TRANSMITTING AND RECEIVING DATA TO PROVIDE HIGH-SPEED DATA COMMUNICATION AND METHOD THEREOF

In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used. 19-. (canceled)10. An apparatus in a wireless communication system , the apparatus comprising: a short preamble,', 'a first and a second long preambles positioned subsequent to the short preamble,', 'a first bit stream positioned between the first long preamble and the second long preamble, wherein the first bit stream comprising at least one bit, and', 'a data field positioned subsequent to the second long preamble; and, 'a receiver configured to receive a frame, the frame comprisinga circuitry configured to determine, based on information in the first bit stream, whether or not the frame is transmitted using space time block coding.11. The apparatus of claim 10 , wherein the second long preamble comprises a third long preamble and a fourth long preamble.12. The apparatus of claim 11 , wherein the first long preamble is preceded by a guard interval having a length of 1.6 μsec claim 11 , each of the third and fourth long preambles is respectively preceded by a guard interval having a length of 0.8 μsec claim 11 , and the data field is preceded by a guard interval having a length of 0.8 μsec.13. The apparatus of or claim 11 , the frame further comprises a second bit stream positioned between the first long preamble and the second long preamble claim 11 , wherein ...

APPARATUS FOR TRANSMITTING AND RECEIVING DATA TO PROVIDE HIGH-SPEED DATA COMMUNICATION AND METHOD THEREOF

In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used. 1. An apparatus for wireless communication , comprising:a processor; and wherein the processor, when instructions stored in the memory is executed, is configured to:', a short preamble,', 'a first and a second long preambles positioned subsequent to the short preamble,', 'a first bit stream positioned between the first long preamble and the second long preamble, and', 'a data field positioned subsequent to the second long preamble; and, 'generate a frame, the frame comprising, 'wherein the first bit stream comprises information indicating whether or not the frame is transmitted using space time block coding, the first bit stream comprising at least one bit.', 'transmit the frame,'}], 'a memory coupled to the processor,'}2. The apparatus of claim 1 , wherein the second long preamble comprises a third long preamble and a fourth long preamble.3. The apparatus of claim 2 , wherein the first long preamble is preceded by a guard interval having a length of 1.6 μsec claim 2 , each of the third and fourth long preambles is respectively preceded by a guard interval having a length of 0.8 μsec claim 2 , and the data field is preceded by a guard interval having a length of 0.8 μsec. This application is a continuation of U.S. application Ser. No. 12/401,293, filed Mar. 10, ...

COMMUNICATION METHOD AND COMMUNICATION DEVICE IN WIRELESS LAN SYSTEM THAT SUPPORTS MULTI-BANDWIDTH

Provided is an apparatus and method for communication in a wireless local area network (LAN) system supporting a multi-bandwidth in which a communication apparatus supporting a multi-bandwidth includes generating a base frame based on at least one of a first bandwidth having the lowest signal-to-noise ratio (SNR) among predetermined bandwidths and a second bandwidth that is two times greater than the first bandwidth, configuring a duplication mode frame based on the base frame, and transmitting the duplication mode frame through a plurality of bands. 1. A communication method by a communication apparatus in a wireless local area network (WLAN) system , the method comprising:generating a physical frame including a plurality of time domain fields, and transmitting the physical frame,wherein the frequency domain repetition is applied to a first part of the plurality of time domain fields without being applied to a second part of the plurality of time domain fields when the frequency domain repetition is applied to the physical frame,wherein the second part is different from the first part,wherein the frequency domain repetition includes mapping a same information to a lower half of frequency subcarriers and an upper half of the frequency subcarriers, andwherein a phase different between a phase applied to information mapped to the lower half of the frequency subcarriers of the first part of the plurality of time domain fields and a phase applied to information mapped to the upper half of the frequency subcarriers of the first part of the plurality of time domain fields is 0 degree or 180 degree.2. The method of claim 1 ,wherein the method further comprising:determining whether a frequency domain repetition is applied to the physical frame.3. The method of claim 1 ,wherein the plurality of time domain fields includes a short training field (STF), a long training field (LTF), a signal (SIG) field, and a Data field.4. The method of claim 3 ,wherein the first part of the ...

APPARATUS AND METHOD FOR ALLOCATING RESOURCE

Provided is an apparatus and method for allocating a resource. According to an embodiment of the present invention, the method of allocating a resource in which an access point allocates a resource for communication between a first station and a second station based on a slot-based channel access scheme in a wireless local area network, the method including confirming a wakeup schedule set between the first station and the second station, and allocating the resource for communication between the first station and the second station through the slot-based channel access scheme reflecting the confirmed WS. 1. A method of allocating a resource in which an access point allocates a resource for communication between a first station and a second station based on a slot-based channel access scheme in a wireless local area network , the method comprising:confirming a wakeup schedule (WS) set between the first station and the second station; andallocating the resource for communication between the first station and the second station through the slot-based channel access scheme reflecting the confirmed WS.2. The method of claim 1 , wherein the confirming of the WS comprises:receiving a resource allocation request frame including the WS from the first station;transmitting a resource allocation response frame including a status code indicating acceptance/rejection for the WS to the first station; andreceiving, from the first station, a tunneled direct link setup (TDLS) Peer power saving mode (PSM) announcement frame including the WS confirmed by the first station reflecting the status code.3. The method of claim 2 , wherein the resource allocation request frame includes at least one of an indication field indicating the WS claim 2 , a field including an identifier for identifying the second station when a value of the indication field is 1 claim 2 , a field including a start time representing a wakeup time claim 2 , a field including a duration representing a period of time of ...

OPERATION METHOD OF STATION IN WIRELESS LOCAL AREA NETWORK

Disclosed are operation method of station in wireless local area network. An operation method comprises setting transmission power of a frame; setting a clear channel assessment (CCA) threshold based on a difference between the set transmission power and a default value of the transmission power; and performing a CCA operation based on the set CCA threshold. Therefore, performance of WLAN can be enhanced. 1. An operation method performed by a station , the operation method comprising:setting transmission power of a frame;setting a clear channel assessment (CCA) threshold based on a difference between the set transmission power and a default value of the transmission power; andperforming a CCA operation based on the set CCA threshold.2. The operation method of claim 1 , further comprising claim 1 , when a channel is determined to be in an idle state by the CCA operation claim 1 , transmitting the frame at the set transmission power.3. The operation method of claim 1 , wherein the transmission power is set based on at least one of a location claim 1 , a density state claim 1 , and an interference state of a basic service set (BSS) to which the station belongs.4. The operation method of claim 1 , wherein the CCA threshold is set to a value greater than a default value of the CCA threshold when the set transmission power is less than the default value of the transmission power.5. The operation method of claim 1 , wherein the CCA threshold is set to a value less than or equal to a default value of the CCA threshold when the set transmission power is greater than or equal to the default value of the transmission power.6. An operation method performed by a station claim 1 , the operation method comprising:setting a clear channel assessment (CCA) threshold;setting a power transmission of a frame based on a difference between the set CCA threshold and a default value of the CCA threshold; andperforming a CCA operation based on the set CCA threshold.7. The operation method of ...

DEVICE AND METHOD FOR CONTROLLING SLOT-BASED CHANNEL ACCESS IN WIRELESS LAN SYSTEM, AND SLOT-BASED CHANNEL ACCESS TERMINAL IN WIRELESS LAN

An apparatus and a method of controlling slot-based channel access by an access point (AP) to manage a network in a wireless local area network (WLAN) environment and a slot-based channel access terminal are disclosed. A slot-based channel access control apparatus of a WLAN system according to an exemplary embodiment determines one of each terminal and a group of terminals as a slot allocation target, allocates a slot defined in a beacon interval to the determined terminal or group to distinguish channel access time, and transmits a beacon including information on the allocated slot. 1. A method for channel access in a wireless local area network (WLAN) , the method comprising:transmitting a beacon frame including window assignment information for assigning one or more windows to a plurality of stations (STAs), wherein each of the one or more windows includes one or more slots; andtransmitting a slot allocation frame to at least one STA of the plurality of STAs;wherein the slot allocation frame according to a first allocation mode includes slot allocation information indicating that each individual STA of the at least one STA is allocated with a zero or more successive slots.2. The method of claim 1 ,wherein the slot allocation information included in the slot allocation frame according to a first allocation mode indicates that:a first number of successive slots from a first start slot to a first end slot are allocated to a first STA, anda second number of successive slots from a second start slot to a second end slot are allocated to a second STA,wherein the first end slot immediately precedes the second start slot.3. The method of claim 1 ,wherein the slot allocation frame according to a second allocation mode includes an indicator that indicates a type of STA identification information included in the slot allocation frame.4. The method of claim 3 ,wherein, when the indicator has a first value, the STA identification information is an association identifier (AID) ...

OFDM TRANSMISSION METHOD AND DEVICE IN WIRELESS LAN SYSTEM

An apparatus and method for orthogonal frequency division multiplexing (OFDM) transmission in a wireless local area network (WLAN) system is disclosed, in which the apparatus for OFDM transmission in the WLAN system includes a signal repetition unit to repeat an encoded signal based on a block unit and output the encoded signal and a repeated signal, an interleaver to interleave the encoded signal and the repeated signal and output an interleaved signal, a modulator to modulate the interleaved signal and output modulated symbols, and a phase rotation unit to phase shift the modulated symbol. 1. A communication method by a communication apparatus in a wireless local area network (WLAN) system , the method comprising:generating a first coded signal;generating a second coded signal, wherein the second coded signal is generated by repeating the first coded signal in block unit;generating a third coded signal based on a bit conversion, wherein the third coded signal is a signal obtained by converting bit information of the second coded signal; andtransmitting a signal generated based on the first coded signal and third coded signal,wherein the third coded signal is generated by converting a first part of bits of the second coded signal based on the bit conversion, andwherein a bit represented by 0 among the first part of bits is converted to 1, and a bit represented by 1 among the first part of bits is converted to 1.2. The method of claim 1 ,wherein the first coded signal comprises 12 bits included in OFDM (Orthogonal Frequency Division Multiplexing) symbol.3. The method of claim 1 ,wherein the second coded signal comprises 12 bits, andwherein the third coded signal is generated based on XOR operation using the 12 bits comprised in the second coded signal and [1 0 0 0 0 1 0 1 0 1 1 1].4. The method of claim 1 , further comprising:interleaving the first coded signal and the third coded signal;modulating the interleaved the first coded signal and the third coded signal; ...

Apparatus for transmitting and receiving data to provide high-speed data comunication and method thereof

In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used.

Apparatus for transmitting and receiving data to provide high-speed data comunication and method thereof

Channel access control method and apparatus in wireless lan system

Disclosed are a method and apparatus for an access point (AP) to control channel access of a station in a wireless local area network (WLAN) system. An AP according to one embodiment may determine resource allocation information for protecting a resource for a station not referring to traffic indication map (TIM) information. The determined resource allocation information is transmitted to a station referring to the TIM information, and the station referring to the TIM information does not conduct channel access in a time period specified in the resource allocation information.

Apparatus for transmitting and receiving data to provide high-speed data comunication and method thereof

In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used.

Apparatus for transmitting and receiving data to provide high-speed data communication and method thereof

In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used.

Support of frequency diversity mode for block code based transmission in OFDMA

Transmitting a frame may include determining a numerology according to a channel bandwidth, indicating the numerology in a field of a frame, and transmitting the frame using the numerology. Receiving a frame may include receiving a preamble of a frame, determining a numerology using the preamble, and receiving later portions of the frame using the numerology. Transmitting a frame may include, for a transmission time slot, determining a value of a first subcarrier of a first Space-Time Stream (STS), determining a value of a second subcarrier of the first STS, and determining, according to complex conjugates or negative complex conjugates of the values of the first and second subcarriers of the first STS, respective values of second and first sub carriers of a second STS. Transmitting a constellation point of a frame may be performed using an orphan subcarrier pair.

Apparatus for transmitting and receiving data to provide high-speed data comunication and method thereof

In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used.

Apparatus for transmitting and receiving data to provide high-speed data comunication and method thereof

Apparatus for transmitting and receiving data to provide high-speed data communication and method thereof

In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used.

Method and apparatus for allocating flexible transmission slot in wireless lan system

A method and an apparatus for allocating a flexible transmission slot in a wireless local area network (LAN) system are disclosed. A flexible transmission slot allocation method of an access point (AP) in a wireless local area network (WLAN) system according to an exemplary embodiment includes transmitting a beacon including a traffic indication map (TIM) bit to a station, receiving a power save poll (PS-Poll) from the station in a slot implicitly allocated by the TIM bit, and transmitting an acknowledgement (ACK) including transmission slot allocation information on downlink data to the station.

Network configuration method for future wireless communication system

The present invention relates to a method of configuring outdoor and indoor networks in the next generation mobile communication system and a method of selecting a transmission frequency for optimal service according to the situation of a user terminal in the outdoor and indoor networks. The method of configuring a network and selecting a transmission frequency in the next generation mobile communication system according to the present invention is configured such that, in the next generation mobile communication system, including a base station controller and a base station, the base station and the base station controller perform wireless communication in a licensed band from 60 to 70 GHz. Furthermore, the base station and a user terminal are configured to perform wireless communication at frequencies allocated according to the mobility characteristics of the user terminal and information about whether a LOS channel has been guaranteed.

OFDM transmission method and device in wireless LAN system

An apparatus and method for orthogonal frequency division multiplexing (OFDM) transmission in a wireless local area network (WLAN) system is disclosed, in which the apparatus for OFDM transmission in the WLAN system includes a signal repetition unit to repeat an encoded signal based on a block unit and output the encoded signal and a repeated signal, an interleaver to interleave the encoded signal and the repeated signal and output an interleaved signal, a modulator to modulate the interleaved signal and output modulated symbols, and a phase rotation unit to phase shift the modulated symbols.

Relay communication method of next generation cellular communication system

A method of performing relay communication in a next generation cellular communication system is disclosed. The next generation cellular communication system includes a base station and a plurality of terminals, and a communication target terminal which has not acquired a Line- Of-Sight (LOS) channel with the base station performs communication through the relay of a relaying terminal which has acquired a LOS channel. The base station determines the relaying terminal. The relaying terminal forms a relaying terminal group by determining one or more relaying assistant terminals. The communication target terminal forms a transmitting/receiving terminal group by determining one or more transmitting/receiving assistant terminals. The base station performs communication with the relaying terminal through the relaying terminal, relaying assistant terminals of the relaying terminal group and the transmitting/receiving assistant terminals of the transmitting/receiving terminal group.

Method for encoding low density parity check codes using result of checking previously specified parity bits

There is provided to a method for encoding an LDPC (Low Density Parity Check) code using the result of checking a previously specified parity, including the steps of: forming a parity bit check matrix having a dual diagonal structure consisting of (N-K) rows for check nodes and (N-K) columns on the basis of the H matrix; calculating the values of all the parity bits by inserting a given binary value in sub-blocks, with the parity bit check matrix formed on the H matrix; if the values of the parity bits are incorrect, checking the parity bit corresponding to the sub-block located in the last part of the H matrix; searching the parity bit parts where the parity bit check result is represented as '1'; performing an XOR operation in sub-blocks on the parity bit part obtained through a simultaneous equation between the parity bits of the searched parity bit parts and the parity bit parts; and determining the value of the parity bit satisfying the condition that the value obtained by multiplying the H matrix by a code word vector.

Access point apparatus for configuring next generation wireless communication network and method of operating the access point apparatus

Disclosed are an access point apparatus for configuring a next generation wireless communication and a method of operating the access point apparatus. The access point apparatus for configuring the next generation wireless communication may include a verification unit to verify a first available band associated with at least one of a first band and a second band; and a configuration unit to configure a backbone network with another access point apparatus positioned within a predetermined distance, through the verified first available band.

Method for changing operating mode of wireless LAN system and wireless LAN system

An operating mode change method of a wireless local area network (WLAN) system according to an exemplary embodiment includes transmitting, by a station (STA) to an access point (AP), an operating mode change request frame comprising at least one of information on a change of a traffic indication map (TIM) mode, a request for a change of a power save parameter, and information on a change of a service type of the STA, receiving, from the AP, an operating mode change response frame comprising at least one of a TIM mode allowed by the AP, a reallocated association identification (AID), and information on a changed power save parameter, and performing at least one of the change of the TIM mode and the change of the power save parameter based on the information included in the operating mode change response frame.

Support of frequency diversity mode for block code based transmission in OFDMA

Transmitting a frame may include determining a numerology according to a channel bandwidth, indicating the numerology in a field of a frame, and transmitting the frame using the numerology. Receiving a frame may include receiving a preamble of a frame, determining a numerology using the preamble, and receiving later portions of the frame using the numerology. Transmitting a frame may include, for a transmission time slot, determining a value of a first subcarrier of a first Space-Time Stream (STS), determining a value of a second subcarrier of the first STS, and determining, according to complex conjugates or negative complex conjugates of the values of the first and second subcarriers of the first STS, respective values of second and first subcarriers of a second STS. Transmitting a constellation point of a frame may be performed using an orphan subcarrier pair.

Apparatus and method for controlling slot usage

Provided is slot use control apparatus and method, including an access point (AP) to control a slotted channel access of a station (STA) in a wireless local area network (WLAN) includes generating a synchronization (synch) frame including an identification value indicating an STA allocated to a slot, and broadcasting the generated synch frame when a channel is in an idle state at a start point of the slot.

Device and method for controlling slot-based channel access in wireless LAN system, and slot-based channel access terminal in wireless LAN

An apparatus and a method of controlling slot-based channel access by an access point (AP) to manage a network in a wireless local area network (WLAN) environment and a slot-based channel access terminal are disclosed. A slot-based channel access control apparatus of a WLAN system according to an exemplary embodiment determines one of each terminal and a group of terminals as a slot allocation target, allocates a slot defined in a beacon interval to the determined terminal or group to distinguish channel access time, and transmits a beacon including information on the allocated slot.

Operation method of station in wireless local area network

Disclosed are operation method of station in wireless local area network. An operation method comprises setting transmission power of a frame; setting a clear channel assessment (CCA) threshold based on a difference between the set transmission power and a default value of the transmission power; and performing a CCA operation based on the set CCA threshold. Therefore, performance of WLAN can be enhanced.

Scanning method in wireless LAN system and supporting device therefor

A scanning method performed by a station (STA) in a wireless LAN system is provided. The method comprises: transmitting a probe request frame; and receiving a short probe response frame from an access point (AP) as a response to the probe request frame. The short probe response frame includes service set ID (SSID) information or compressed SSID information of the AP.

Apparatus and method for controlling transmission schedule for buffered data in wireless LAN, and terminal for receiving buffered data based on transmission schedule in wireless LAN

Disclosed is a technology that enables an access point, configured to manage a network, to control a transmission schedule of buffered data and enables a terminal to obtain information associated with the transmission schedule in a wireless local area network (WLAN) environment. An apparatus for controlling a transmission schedule of buffered data in a WLAN according to an embodiment may group terminals based on at least one of a service characteristic and a traffic characteristic of each of the terminals, assign group information to each of the grouped groups to wake up in a different time, and transmit at least one of delivery traffic indication map (DTIM) information and the buffered data based on the assigned group information.