Feedback of channel state information for MIMO and subband scheduling in a wireless communication system

The request submission 27 March 2006 entitled "downlink MIMO-OFDMA sub-band scheduling channel state feedback" United States Provisional Patent application Serial number 60/786, 445 of the priority, the application has been assigned to the assignee, and herein will be incorporated into the same by reference.

Technical Field

The present disclosure relates generally to communication, and more specifically, relates to the technology of transmitting channel state information.

Background Art

In a wireless communication system, the base station can utilize a plurality of (a T) transmission antenna transmits data to the assembly with a plurality of (a R) terminal of the receiving antenna. A plurality of launching and receiving antenna can be used for increasing throughput and/or improve reliability of a multi-input multi-output (MIMO) channel. For example, the base station can transmit antenna from the T T at the same time the number of transmission according to the flow to improve throughput. Alternatively, the base station can transmit T from all of the single antenna transmission improve terminal receiving data stream.

Can be obtained through a data transmission via the highest overall throughput of the MIMO channel to transmit one or more data stream, of good performance can be realized. To promote this point, the terminal can estimate the response of the MIMO channel, and the channel state information is transmitted to the base station. Channel state information may indicate how many data stream transmission, and these transmitting data stream of each data stream channel quality indicator (CQI). Each data stream can be CQI indicating that the data stream of the received signal-to-noise ratio (SNR), and can be used for choosing the appropriate rate for the data flow. Channel state information sent to the terminal can improve the performance of the data transmission. However, the terminal will consume a large amount of radio resources to the channel state information is transmitted to the base station.

Therefore, in the technical field, the presence in the wireless communication system efficiently transmitting the channel state information needs of-the-art technology.

Content of the invention

In the wireless communication system described herein effectively transmitted in the channel state information. On the one hand, differential coding to be transmitted can be used for reducing the number of channel state information. Differential encoding means is said that the value of the difference between the two, and is not the actual value. On can be in the space, the frequency, and the frequency in the space, in the space, frequency and time, or in some other dimension of the combination of differentially encoded CQI value.

In one design, a plurality of sub-bands can be determined of a plurality of space the space of the signal channel state information. Space state information may correspond to a different antenna, different pre-coding vector, and so on. Space state information can indicate a specific set of antenna, a specific group of pre-coding vector, and so forth used for data transmission. Can obtain a plurality of sub-bands of a plurality of spatial channels CQI value. Can be in a plurality of spatial channels and a plurality of sub-bands CQI value of the differential coding to obtain differential CQI information, which may include various differential CQI value. In another design, can be in a plurality of time intervals in a plurality of sub-bands of the plurality of spatial channels obtained CQI value, and can be in the space, the frequency and time differential coding CQI value. In any cases, differential CQI information and space state information can be used as a feedback is sent.

On the other hand, the channel state information may be different under different operation modes to send to heterogeneous report. In one design, when in the 1st mode of operation when (such as scheduling mode), 1st CQI information can be in accordance with the report of the report mode. When in the 2nd mode of operation (such as the non-deployment mode) when, 2nd CQI information can be in accordance with the report of the report mode. The report mode for different, CQI information can be generated in a different manner and/or with different speed transmission.

Various aspects of the present disclosure and is described in detail further below.

Description of drawings

Figure 1 shows a block diagram of the base station and the terminal.

Figure 2 shows the stature strip N M CQI value of the spatial channels.

Figure 3A of the differential on the space is shown for encoding CQI.

Figure 3B the difference in frequency is shown for encoding CQI.

Figure 3C shown in space and at the frequency of differential CQI coding.

Figure 3D shown in the space, the differential frequency and time coding CQI.

Figure 4A shown each sub-band on the space differential CQI coding.

Figure 4B shown in space and at the frequency of differential CQI coding.

Figure 4C shown in the space, the differential frequency and time coding CQI.

Figure 5 shows that isomerous CQI report.

Figure 6 and 7 are respectively shown in the space and at the frequency of reporting channel differential encoding process and apparatus of the status information.

Figure 8 and 9 are respectively shown in the space, frequency and time reporting channel differential encoding process and apparatus of the status information.

Figure 10 and 11 are respectively shown for the channel state information of the report of the heterogeneous of the process and apparatus.

Mode of execution

The status information of the send channel of technology can be used for various supports MIMO transmission and use of any form of frequency division multiplexing (FDM) communication system. For example, the technique can be used for utilizing the orthogonal FDM (OFDM), single-carrier FDM (SC-FDM), and so on of the system. SC-FDM OFDM and the system bandwidth is divided into a plurality of (a K) of orthogonal sub-carrier, its also referred to as voice (tone), block (bin), and so on. Each sub-carrier can be used for modulating the data. Generally, in the form of OFDM modulation symbols in the frequency domain to form SC-FDM and sent in the time domain.

The technology can also be used for the downlink or uplink channel state information is sent on. Downlink (or forward link) means from the base station to the terminal of the communication link, the uplink (or reverse link) is referred to to the base station from the terminal of the communication link. In order to clear, in the up-link for transmitting the channel state information of the current technology to the description below.

Fig. 1 shows a wireless communication system 100 in the base station 110 and terminal 150 block diagram of the design. Base station 110 can also be referred to as node B, evolved node (node e B) B, access point, and so on. Terminal 150 (UE) can also be referred to as user equipment, mobile station, access terminal, user unit, site and so on. Terminal 150 can be a cell phone, personal digital assistant (PDA), wireless communication equipment, hand-held device, wireless modem, laptop computer, and so on. Base station 110 is provided with a plurality of (a T) antenna 134a-134t. Terminal 150 is provided with a plurality of (a R) antenna 152a-152r. Each transmit antenna and each of the receiving antenna can be a physical antenna or antenna array.

In the base station 110 is, the transmission (TX) data processor can from the data source 112 receives flow data, according to the packet format processing (for example, formatting, pre-coding, interleaving and symbol mapping) flow rate data, and generate data symbol. As used herein, the data symbol is the data symbol, the pilot symbol is used for pilot symbol, and symbol is usually a complex value. Data symbols and pilot symbols can be, for example, from the modulation scheme PSK or QAM modulation symbol. Pilot frequency is known in advance, and the terminal by the base station of the data. Packet format can instruct the data rate, the coding scheme or the coding rate, modulation scheme, packet size and/or other parameters. Packet format can also be referred to as modulation and coding scheme, rate, and so on. TX data processor 120 can be a demultiplexing the data symbol stream M (demultiplex), wherein generally 1 the M≤T [...]. M data symbol stream can also be transmitted via the MIMO channel at the same time, and can also be referred to as data flow, and flows, the business flow, and so on.

TX   MIMO processor 130 can be based on direct MIMO mapping, precoding the data and pilot symbols such as the implementation of transmitter spatial processing. Data symbol can be sent from one antenna to MIMO mapping, or from a plurality of antenna is sent to the pre-coding. Processor 130 can be a T T the output symbol stream provided to a modulator (MOD) 132a-132t. Each modulator 132 modulates the output symbol (such as OFDM, SC-FDM etc.) to obtain output chip. Each modulator 132 further processing (for example, converted to an analog, filtering, amplification and conversion) the output chip, and producing the down-link signal. From the modulator 132a-132t of a T respectively of the downlink signal via antenna 134a-134t is transmitted.

The terminal 150 is, antenna R 152a-152r received downlink signal T, and each antenna 152 corresponding to the received signal is provided to a demodulator (DEMOD) 154. Each demodulator 154 processing (such as filtering, amplification, down-conversion and digital) to obtain the sampled received signal, and can further the sample value is subjected to a demodulation (for example, OFDM, SC-FDM etc.) to obtain the received symbol. Each demodulator 154 of the received data symbols will be provided to a receiving (RX) MIMO processor 160, and will the received pilot symbols provided to the channel processor 194. Channel processor 194 can be based on the received pilot symbols to estimate from the base station 110 to the terminal 150 of the response of the MIMO channel, the channel estimates and provided to RX   MIMO processor 160. RX   MIMO processor 160 can utilize the channel estimates of the data symbols received MIMO detection, and to provide data symbol estimates. RX data processor 170 can be processed for the data symbol estimates (for example the solution interweaves and decoding), and the decoding data to the data sink (data   sink) 172.

Terminal 150 can assess the condition of the channel, and the channel state information is transmitted to base station 110. TX channel state information may be a signaling processor 180 for processing (such as being pre-coding, interleaving and symbol mapping), by the TX   MIMO processor 182 performs spatial processing, by the modulator and 154a-154r further processing, thus produce a R uplink signal, through the antenna 152a-152r transmission.

In the base station 110, R one uplink signal from the antenna 134a-134t receiving, by the demodulator 132a-132t for processing, from RX   MIMO processor 136 performs spatial processing, and further by the RX the signaling processor 138 performs spatial processing (such as by de-interleaving and decoding) to restore by the terminal 150 transmits the channel state information. Based on the channel state information received from the terminal, the controller/processor 140 can control the sent to terminal 150 of the data transmission.

Controller/processor 140 and 190 respectively in the base station 110 and terminal 150 of control operation. Memory 142 and 192 are respectively the base station 110 and terminal 150 for storing data and program code. From all of the terminal based on the channel state information received, the scheduler 144 can select terminal 150 and/or other is performed on the terminal data transmission on the downlink.

In the base station 110 to the terminal 150 can be downlink transmission of S of a space channel is available, this is {T, R} S≤min. S space channel can be formed in various forms. For direct MIMO mapping, a S S data stream can be transmitted from the transmit antennas, each transmitting antenna a data stream. A S corresponding to space channel can then be used for data transmission on the transmit antenna S. The pre-coding, a S multiplied by the data stream can be pre-coded matrix, so that each data stream can be T from all of the transmit antenna transmitting. S space then can be correspondent to the data S and the class sees S to Precode the matrix form of a "virtual" antenna. Generally, a M M space in the data stream can be transmitted on a channel, each spatial channel a data flow, this is the 1 M≤S [...]. Based on one or more criteria, such as total throughput, can be spatial channels M from the S selects the signal channel of space.

For concise purpose, the following description the assumption that each data stream is transmitted on a spatial channel, depending on a use direct MIMO mapping or precoding, it can be correspondent to the actual antenna or a virtual antenna. The term "data stream", "space channel" and "antenna" can be can be alternately used. M packet or code word may be at the same time a M sent on the data stream.

Terminal 150 can use various MIMO detection technical stream M, for example linear minimum mean squared error (MMSE), zero forcing (ZF), Serial interference cancellation (SIC), and so on, all of these are well known in the field. Assume SIC recovery of a data stream at a time, each of the estimates of the interference caused by a recovery data stream, the restoration and before the next data stream to eliminate the interference. SIC can be improved by subsequently received SNR of the data stream is resumed.

System 100 can support scheduling to improve the performance of the sub-band. System bandwidth can be divided into a plurality of (two N) the sub-band. Each of the sub-sub-carrier K can be covered in a total of Q consecutive sub-carrier, this is the value of the or some other Q=K/N. Because the multi-path channel frequency selective fading, the different sub-band, the terminal 150 may obtain different SNR. Using sub-band scheduling, terminal 150 while having good SNR can be the sub-band instead of with bad SNR is in allocating sub-carrier of the sub-band. While having good SNR data can be assigned to sub-bands of the carrier wave is sent in a higher rate.

Terminal 150 may send a channel state information to support the base station 110 of the MIMO transmission and sub-band scheduling. Channel state information can include:

· Space for MIMO transmission of the status information, and

· Used in the sub-band to scheduling, CQI information rate selection, and so on.

Space state information can include various types of information. In one design, a given sub-band space state information may be instruction is used for the sub-band a group of data transmission of the transmit antenna M. Terminal 150 MIMO channel response can be estimated, based on the MIMO channel estimates the possibility of assessing a plurality of sets of transmitting antenna, the best performance is determined with (for example, the highest overall throughput) of a group of transmit antenna. The information space can then be set of transmit antenna.

In another design, a given sub-band space state information may be instruction is used for the transmission of a group of sub-bands M virtual antenna (or the price to, a group of M plurality of pre-coding vector). The different possible pre-pre-coding matrices and/or different combination of the row of matrix, terminal 150 can be assessed data performance. Space state information can then be the best indicator of the performance of a pre-coded vectors M a group, such as the particular pre-coding matrix, and similarly the precoding matrix row of specific M.

Generally, space state information may indicate the number of data streams to be transmitted (which can be of the MIMO channel order related), used for transmitting a group of antennas, is used for transmission of a set of pre-coding vector, other information or a combination thereof. Space state information may be one or a plurality of sub-band to provide.

CQI information can be for different space channel and/or different of that of the sub-band or equivalent SNR information. The frequency selectivity of a radio channel, for different sub-band possible to obtain different SNR. Also it is possible for different space channel and obtain different SNR, if base station 110 using direct MIMO transmission of the data mapping, and if the terminal 150 receives the data Serial interference cancellation, and so on. Therefore, for different sub-bands of different spatial channel can obtain different SNR. In a given sub-bands of the given spatial channel SNR can be used for choosing the appropriate packet format, which can be instructed via the sub-band is used for the spatial channel coding rate of the data transmitted, the modulation scheme, the data rate, and so on. Generally, CQI information may represent one or a plurality of spatial channels and/or one or more of the sub-band of the SNR and/or other of the information of the display of the quality of the received signal.

Figure 2 shows the stature strip N M CQI value of the spatial channels. Each sub-can be obtained with n each of the spatial channels on the m value CQI X_nm. CQI value can then be the number of the number of the channels of the same space with the sub-band is proportional to the product of the number of, or M·N CQI value of one. These CQI value can be used in the sub-band to scheduling choose the suitable for data transmission the sub-band. These CQI value can also be used for for each of the sub-bands each space of the channel confirm the appropriate packet format. However, all the M·N CQI value is sent to a base station 110 may consume a large amount of uplink resources.

On the one hand, a differential coding can be used for reducing the number of channel state information. Differential encoding means is said that the value of the difference between the two, and is not the actual value. If the value in the actual value and the deviation of the phase comparison is small, then compared with the actual value, the difference can use fewer that the foundation. The differential coding may be at the same time provide good less the performance of the signaling overhead. On can be in the space, the frequency, and the frequency in the space, in the space, the frequency and time or in some other dimension of the combination of differentially encoded CQI value.

Table 1 lists CQI information can be in a number of different information. Integrity value CQI CQI value can be called also, reference (pivot) CQI value, actual CQI value, and so on. Differential CQI value can represent two complete difference between the values CQI (such as Y or ΔX) or two differential CQI difference between the values (such as ΔY, or ΔΔX ΔΔY). Generally, differential CQI information can include display in the integrity and/or differentiating CQI difference between the values (such as form 1 in the Y, ΔX, ΔY, and/or ΔΔX ΔΔY) of any information.

Form 1

The difference of in the space coding, a spatial channel may be a designated space channel, and the remaining space channel can be no channel designated space. Complete CQI value may be provided to the designated spatial channel, and differential CQI value can to each undesignated space channel or all of the undesignated space channel to provide. In the frequency of the differential coding, a sub-band can be assigns the innertube , and the remaining sub-band can be unspecified sub-band. Complete CQI value may be provided to the designated sub-band, and differential CQI to each value may be provided to the sub-band is not designated. The differential coding of the on time, a time interval can specified time interval, and one or a plurality of other time interval can be a non-specified time interval. Complete CQI value may be provided to the designated time interval, and differential CQI to each value may be not provide given time interval. Designated sub-band can also be referred to as main sub-band, preferably sub-band, the reference sub-band, and so on. Channel and designated space to a designated time interval that other terminology.

Figure 3A show a sub-bands of the two spatial channels in the space on the design of the differential coding CQI. In this example, the value of the channel designated space a for X_a CQI value of is obtained, and the value of the channel designated space b for X_b CQI value of is obtained. Terminal 150 can be drawn (or transmitter) CQI and sending the following information:

X=X_a, of formula (1)

Y=X_b-X_a.

Base station 110 (or receiver) can be from the terminal 150 receives the X and Y, and can as follows to obtain the initial CQI value, as follows:

X_a =X, of formula (2)

X_b = X+Y.

Since the X and Y the quantization, the base station 110 CQI value of the terminal may not be strictly and 150 CQI value obtained by matching. For concise purpose, most of the description of the following assuming no quantization error.

Figure 3B shown two sub-bands of the frequency of a space channel coding CQI on the design of the differential. In this example, the designated sub-band 1 on the value of the signal channel of space for X₁ CQI value of is obtained, and not the designated sub-band 2 on the same space channel value is X₂ CQI value of is obtained. Terminal 150 can obtain CQI and sending the following information:

X=X₁, of formula (3)

ΔX=X₂-X₁.

Base station 110 can be from the terminal 150 receives X and ΔX, and can reach the following initial CQI value:

X₁ =X, of formula (4)

X₂ = X+ΔX.

If in a single spatial channel single data stream is transmitted on, the difference in frequency CQI coding can be used. In such a case, a space for the other channel differential CQI value may not be needed.

Figure 3C shown in two sub-bands of the two spatial channel space and frequency on the design of the differential coding CQI. In this example, the specified sub-band 1 on, the value of the channel designated space a for X_1a CQI value of is obtained, and the value of the channel designated space b for X_1b CQI value of is obtained. The undesignated sub-band 2 on, and a signal channel of space b for value X_2a and X_2b CQI value of is obtained. Terminal 150 CQI information the following can be obtained:

X=X_1a, formula (5)

Y=X_1b-X_1a,

ΔX=X_2a-X_1a, and

Wherein Y₁ and Y₂ are sub-band 1 and 2 on the difference of the space channel b CQI value. Terminal 150 can send the X and Y as the sub-band 1 of information CQI, and Δ X Δ Y can be sent as a sub-band 2 CQI of information.

Base station 110 can be from the terminal 150 receives the X, Y, and ΔX ΔY, and can be obtained the initial CQI value as follows:

X_1a =X, formula (6)

X_1b = X+Y,

X_2a = X+ΔX, and

X_2b = X+ΔX+Y+ΔY.

In the formula (5) in the design shown, differential coding on the first space, and then on the frequency. Differential encoding can also be carried out on the first frequency on and then in the space.

Figure 3D shown in the two time intervals of the two sub-bands in the space of the two spatial channels, frequency and time the design of the differential encoding. In time interval 1 in, designated sub-band 1 and a space on the b channel for value X_1a and X_1b CQI value of may be obtained, and not the designated sub-band 2 and a space on the b channel for value X_2a and X_2b CQI value of may be obtained. In time interval 2 in, the sub-band 1 and a space on the b channel for value X '_1a and X'_1b CQI value of may be obtained, and sub-band 2 and a space on the b channel for value X '_2a and X'_2b CQI value of may be obtained. If equality group (5) shown in the, terminal 150 time interval can be obtained 1 CQI value of.

Terminal 150 can be as follows at time interval 2 CQI information of:

ΔX '=X'_1a-X_1a, formula (7)

And

Wherein ΔX ' is within the two time intervals the sub-band 1 of a space channel on the difference between the values CQI,

ΔY ' is within the two time intervals the sub-band 1 of channel b the space on the difference between the Y value,

The two ΔΔX time interval of a space channel in the difference between the values Δ X, and

The two ΔΔY the space in the time interval b between the channel of the difference of Δ Y value.

In time interval 1, terminal 150 can send the X and Y as the sub-band 1 of information CQI, and can be sent to the sub-band and Δ X as Δ Y 2 CQI of information. The time interval 2, terminal 150 can send ΔX 'and ΔY' as sub-band 1 of information CQI, and can send ΔΔX and ΔΔY as sub-band 2 CQI of information.

Base station 110 can be in time interval 1 from the terminal 150 receives the X, Y, and ΔX ΔY, can be the time interval and 2 receiving ΔX ', ΔY' , ΔΔX and ΔΔY. If equality group (6) shown in the, base station 110 can obtain time interval 1 the initial CQI value. Base station 110 can be as follows at time interval 2 initial CQI value of:

X '_1a = X+ΔX' , formula (8)

X '_1b =X'_1a +Y+ΔY ',

X '_2a =X'_1a +ΔX+ΔΔX, and

X '_2b =X'_1b +ΔX+ΔΔX+ΔY+ΔΔY=X '_2a +Y+ΔY' +ΔY+ΔΔY.

In the formula (7) in the design shown in, differential coding on the first space, and then on the frequency, and the on time. Differential encoding can also be carried out on the first frequency, and then on the space, and then carried out in time.

For concise purpose, Figure 3A-3D shown two space channel, and two two sub-differential encoding of the time interval. Differential encoding can be extended to any number of space-channel, any number of sub-band and any number of time intervals.

More than two space on the space of the signal channel of the differential coding may be carried out in various ways. In one design, the spatial channel CQI value is assumed to be composed of a common Y value associated with linear manner. Therefore, if the designated spatial channels having a value for X of CQI, then the channel space b having X+Y CQI value of the, space channel c has a value of X + 2Y CQI value of, d having a spatial channel is X + 3Y CQI value of, , and so on. A single Y value can be for all undesignated space channel transmission. In another design, can be each undesignated space channel with respect to the channel designated space or the neighbouring space channel to calculate the separate Y value. For example, if space channel a, b, c and d are respectively provided with value is X_a, X_b, X_c and X_d value, then space channel b, c and d are respectively the Y value can be calculated as Y_b = X_b-X_a, Y_c = X_c-X_b and Y_d = Y_d-X_c. Y_b, Y_c and Y_d value for spatial channel b, c and d can be separately transmitted. In another design, can not designated space for each of the Y value calculating individual channel. Single index may then be sent by the channel designated space for said all Y value. Different combinations of Y value can be defined and stored in the lookup tables. A single index may indicate in the form of the inspection with the calculated Y value of the group most closely matching the specific combination of the Y value. A plurality of designated space Y value of the channel can also be expressed in other ways. The purpose of a simple, most of the following description of not assuming a channel designated space.

Generally, any number of bits may be used to include in the channel state information of the each of the information. The following symbols are used in the following description:

N_X-CQI value of the number of bits X of,

N_Y-differential CQI value of the number of bits Y of,

N_W-differential CQI value Δ X and the number of bits of Δ Y,

N_Z-space the number of bits of the status information, and

N_S-indicating designated the number of bits of the sub-band, the

For a given one of the number of bits of information can be based on this information the amount of details or precision weigh the signalling overhead to choose between. In one design embodiment, M=2 for having the 2 layer MIMO, N_X = 5, N_Y = 3, N_W = 4, N_Z = 2, M=4 for having the 4 layer MIMO, N_Z = 4. Other N_X, N_Y, N_W and N_Z value can also be used.

The programme can be used for various reports in an effective way to transmit the channel state information. In some of the reports are described below.

Figure 4A N to show with each of the sub in the space of the differential on the encoding and CQI coded independently, the programme report 1st. In this scheme, complete CQI value X_n, differential CQI value Y_n, and N space state information may be for each of the sub-band a is transmitted. N sub to all of the report can include CQI N· (N_Z + N_X + N_Y) bit. Each sub-band of the value of the integrity of the n CQI X_n and differential CQI value Y_nequality group can be such as (1) is determined as shown in the.

2nd N with the report a subset of the sub in the space coding and independent differential CQI coding. This subset can include sub-L with, and can be made of a N_L index is used to identify the sub-band set, wherein the L ≥ 1 and N_L> 1. For example, if there are 8 the sub-band and 3 can be a report of continuous sub-bands, then N_L can be equal to 5. In this scheme, complete CQI value X_n, differential CQI value Y_n and space for state information of each of the L sub-band a is transmitted. Sub-L with the report can include CQI L· (N_Z + N_X + N_Y) +N_L bit.

CQI information can also be a different time interval and to different subsets of the sub-transmission. For example, with the sub-N from the head to the tail circulation, and one of the sub-information can be CQI in each time interval to N_Z + N_X + N_Y bit is sent. More than one of the sub-information CQI in each can also be transmitted within the time interval.

3rd report N stature with a programme to the differential encoding in the space, to all the independent coding and with the use of common sub-N the space state information. For each sub-band, for the sub-band to provide the best performance (for example the highest overall throughput) of a group of space channel (such as a set of antenna or a group of pre-coding vector) can be determined. The best spatial channel with the sub-N N space to choose the channel, and can be used as all of the spatial channels N channel group common space. Alternatively, to provide the best for all of the sub-N with an average of the performance of the group space can be selected as the common space channel group. Based on the common space channel, can obtain an integrity and differential CQI value. N sub to all of the report can include CQI N_Z +N· (N_X + N_Y) bit. Common space state information can also include other information, rather than common space channel or in addition to the common space outside the channels. In another design, space state information can be a particular unit the report (for example each sub-band), CQI information can be a larger unit (for example a plurality of status report unit space) and report the average of the. Report the unit therefore CQI status report unit can be larger than the space, in the respect of frequency, for example.

Figure 4B shown programme report 4th, in space and the differential at the frequency of coding CQI. In this scheme, complete CQI value X_l, differential CQI value Y_l and space state information can be provided to the designated sub-band l, and can be with the N_Z + (N_X + N_Y) bit transmission. Designated sub-band may be pre-determined (for example sub-band 1) of the sub-band, the best performance with the sub-band, and so on. If the designated sub-band is not fixed, then can send N_S bit to indicate which one of the sub-band is assigned with. Based on the common space state information (such as the common space channel), each designated can be drawn of the differential of the sub-band and Δ X ΔY CQI value, and may be sent to the sub-band. N sub to all of the report can include CQI N_Z + (N_X + N_Y) + (N-1) · N_W + N_S bit.

In one design, the difference in frequency encoding CQI adjacent the to obtain the difference between the sub-band. In this design, not designated sub-band of the differential n CQI information can be included in the sub-band and n n-1 CQI value of the differential between Δ X_n = X_n-X_n-1 and Δ Y_n = Y_n-Y_n-1, n+ 1 or in the sub-band n and the difference between the value CQI Δ X_n = X_n-X_n+1 and Δ Y_n = Y_n-Y_n+1.

Report can include CQI of various formats performance of different items of information. N stature with index are arranged in monotonic manner, so that in the system bandwidth, sub-band 1 emitses of the sub-band low frequency range and the highest frequency range occupied N, as shown in Figure 2. L with the appointed if the sub-band is, then the former N_S bit can represent the index l designated sub-band, the rear N_Z l is the space that the status information of the sub-band, and the latter (N_X + N_Y) bit may be said that the integrity of the sub-band value CQI l X_l and differential CQI value Y_l. The rear N_W bit may indicate that the sub-band and l l+ 1 and the space between the differential CQI information on the frequency (an example such as Δ X_l+1 and Δ Y_l+1). The rear N_W bit can represent sub-band l+ 1 and l+ 2 CQI the difference between the information, by analogy, and N_W bit can represent sub-band N-1 and N CQI the difference between the information. Furthermore, the rear N_W bit may indicate that the sub-band and l l-1 information CQI the difference between, the rear N_W bit can represent sub-band l-1 and l-2 CQI the difference between the information, by analogy, then the final N_W bit can represent sub-band 2 and 1 of the differential between CQI information.

Form 2 of the first three are shown out of the neighbouring sub-coding the difference between the design of the differential CQI information. In this design, each undesignated sub-band CQI information includes the differential n N_W = 4 and jointly provide (i) with channel designated space n and adjacent of the difference between the value of the sub-band CQI Δ X_n, and (ii) not designated space value of the differential signal channel CQI Δ Y_n. Each of the sub-bands of each of the spatial channels equality group CQI value can be such as (5) and (6) to determine indicated in the claims.

Form 2

In another design, the difference in frequency with the designated sub encoding CQI through taking obtaining the difference. In this design, not designated sub-band of the differential n information can include CQI l in the designated sub-designated sub-band n and the difference between the value CQI Δ X_n = X_n-X_l and Δ Y_n = Y_n-Y_l.

L with the appointed if the sub-band is, then the former N_S bit can represent the index of the designated sub-band, the rear N_Z l is the space that the status information of the sub-band, and then the rear (N_X + N_Y) bit may be said that the integrity of the sub-band value CQI l X_l and differential CQI value Y_l. The rear N_W bit may indicate that the sub-band and l l+ 1 and the space between the differential CQI information on the frequency (an example such as Δ X_l+1 and Δ Y_l+1). The rear N_W bit can represent l+ 2 of the sub-band and l CQI the difference between the information, by analogy, and N_W of the sub-band is between and l N said differential CQI information. Furthermore, the rear N_W bit may indicate that the sub-band and l l-1 information CQI the difference between, the rear N_W bit may indicate that the sub-band and l l-2 CQI the difference between the information, by analogy, the final and N_W bit may indicate that the sub-band and l 1 CQI the difference between the information.

Form 2 of the last three are concerned with the designated sub-bands of differential encoding in the design of the differential CQI information. In this design, each undesignated sub-band CQI information includes the differential n N_W = 4 and jointly provide (i) of the sub-channel designated space the difference between n and l CQI value Δ X_n, and (ii) not designated space value of the differential signal channel CQI Δ Y_n. If the designated sub-band has the best performance and is used as the reference of the sub-band is not designated, then each has not designated CQI value of the differential of the sub-band Δ X_n should be non-positively value. Each of the sub-bands of each of the spatial channels equality group CQI value can be such as (5) and (6) to determine indicated in the claims.

Form 3 shown for N_W = 3 bit, with the designated sub-band of the differential coding of the differential CQI another design of information.

Table 3

Form 1 to 3 show the differential value CQI Δ X_n and Δ Y_n some examples of joint encoding. Also can use other joint coding design.

N CQI sub report can represent all of the information CQI, e.g. FIG 4B shown in. N CQI the report also can be expressed with a subset of the sub information CQI. In one design, even time interval report can include integrity of CQI CQI value X_l, differential CQI value Y_l and designated l space state information of the sub-band, and can be in N_S + N_Z + (N_X + N_Y) bit transmission. Odd time interval report can include CQI each undesignated of the sub-differential CQI value Δ X and ΔY, and can be with the (N-1) · N_W bit is sent. If there are many sub-band, then not designated CQI of the sub-plurality of information can be transmitted within the time interval. Specified or unspecified CQI of the sub-information can also be sent in other ways.

Figure 4C programme report 5th is shown, in the same space, the differential frequency and time coding CQI. If the wireless channel changes slowly, differential coding can be the time (for example, in continuous of the report of the on interval) to on. In this scheme, comprising space-frequency CQI CQI of information in each report can be sent time interval P, wherein P> 1. Space-frequency CQI information can include any scheme based on the above described for one or more sub-bands of one or a plurality of spatial channels CQI information generated. For example, space-frequency CQI information may include the above described-based a 4th N subband of the two space CQI   information channel generation of N_Z + (N_X + N_Y) + (N-1) · N_W + N_S bit. As discussed above, space-frequency CQI information can be in a time interval or may be in a plurality of time intervals is sent. Time difference information CQI comprising one or more of the reports can be CQI with space-frequency CQI information during the time interval between the report is sent. Each CQI CQI in the report according to the time difference information of the report of the previous CQI CQI information to generate. CQI information may include time difference of the designated sub-band of the reported by the Δ X and Δ Y and each undesignated sub-band and ΔΔX ΔΔY. ΔX, ΔY, and ΔΔX ΔΔY value may be as indicated in the preceding Figure 3D the draw. Each of the P sub-time interval the change can be designated.

The above-mentioned 1st to 5th programme report is assumed that a plurality of spatial channels are available. If the use of a single spatial channel, then differential coding may be carried out in frequency, and differential CQI value Y can be omitted. Δ X values can be transmitted with less bits, because only the difference in frequency (rather than in the space) is expressed. Differential encoding can also be carried out in frequency and time. If a differential encoding is not carried out on the space, and ΔX ΔΔX values can be transmitted with less bits.

Generally, information and CQI space state information may be in the same rate or to report different rate. Space state information may be to report to one rate, which rate CQI information may be to report to 2nd, 1st can be the same or slower than the faster than that rate.

The channel state information may be based on a configured to generate and report, the configuration for the terminal but is chosen, and can be through the signalling in order to semi-static manner to change. In one design, designated can be obtained with the channel state information and reports it. In another design, the channel state information may be the average of all the sub-bands (for example based on the channel state capacity function), average channel state information and report. If the average channel state information is reported, then differential CQI CQI information according to the information to obtain an average. Furthermore, designated sub-band does not need to be expressed.

Space state information may rely on the terminal 150 preferences. In one design, used for selecting a group of space channel (or a group of antennas) all of the criteria can be based on the average of the sub-channel characteristic. In another design, the criteria can be based on the designated sub-band a channel characteristic.

In one design, the terminal 150 can be based on the selected report channel state information-generation plan, and in each report interval, the report based on continuous way of channel state information. This design can, for example, in the terminal 150 with one or a small number of report interval is used when the period of service.

In another design, the terminal 150 can be in the service period is generated in a different manner and/or reporting channel state information. This design can, for example, in the service period for a long time longer than the report interval is used. Terminal 150 can be transmitted during the services a plurality of packets, and each packet can be to select a suitable transmission of a group of packet format and is suitable for space channel. Packet transmission can be across one or a plurality of report interval. Sub-band can be designated for each packet transmission but is chosen, with different and can change the packet transmission. The choice of the sub-transmission of each packet is unchanged. In such a case, the index of the designated sub-band can be transmitted during the transmission of packets in the report CQI are ignored.

At any given moment, the terminal 150 can be in a plurality of modes of operation of the operation one mode of operation, such as scheduling mode or non-deployment mode. In the scheduling mode, terminal 150 to the scheduled transmission on the downlink, and may have a terminal and a base station to a known distribution of the sub-band. In the scheduling mode, can be expected to accurately allocating sub by the report with the average channel state information, and is not accurately report all of the sub-channel state information. Under the non-deployment mode, terminal 150 may not be scheduled for transmission on the downlink, and may not have a distribution of the sub-band. Under the non-deployment mode, as much as possible can be expected to report of the channel state information of the sub-band. Depending on whether the terminal is scheduled for transmission, terminal 150 can be in scheduling and dispatch between the mode conversion. For example, terminal 150 can be in its services in the scheduling mode during operation, and can be other than in its period of service in the non-scheduling mode of operation.

In another aspect, the use of the heterogeneous report, and terminal 150 can depend on the its mode of operation to transmit different channel state information. In the scheduling mode, terminal 150 can be in the allocated one or more of the sub-band the overall or average channel characteristic is generated on the basis of the complete differential CQI CQI value X and Y values. Terminal 150 can be to N_Z + (N_X + N_Y) CQI value to represent integrity of the, differential CQI value and the space state information. Terminal 150 can be at a relatively high rate or more frequent reporting channel status information, in order to timely manner in order to update the channel state information. For example, terminal 150 can report within each report interval N_Z + (N_X + N_Y) bit.

Under the non-deployment mode, terminal 150 can produce CQI all or many of the sub-information. For example, terminal 150 can be based on Figure 4B programme generated in the report information CQI 4th, and can be transmitted to all the sub-band N N_Z + (N_X + N_Y) + (N-1) · N_W + N_S bit. Terminal 150 can also be based on Figure 4C 5th report in the programme or some other scheme generates CQI information. Terminal 150 can be at a relatively low rate or less frequent reporting channel status information, in order to reduce signaling overhead,.

Figure 5 shows that the programme isomerous report. Terminal 150 can be in the time T₁ and T₂ scheduling mode of operation in between. In this time period, the terminal 150 can only determine the selected one or more of the sub-channel state information (such as average CQI), and the more frequent reporting channel state information, for example with every T_rep1 a rate of seconds. Terminal can in time T₂ and T₃ in between the non-scheduling mode of operation. In this time period, the terminal 150 all N sub can be determined with the channel state information (for example each sub-band CQI), and can be less frequent reporting channel state information, for example with every T_rep2 a rate of seconds, wherein T_rep2> T_rep1.

Figure 6 shows in space and report on the frequency channel state information of a differential encoding process 600 design. A plurality of sub-bands can be determined of a plurality of space the space of the signal channel state information (box 612). A plurality of spatial channels can be correspondent to the selected from a plurality of can be used for transmitting a plurality of antennas of the antenna. Channel information space can then be indicative of the selected antenna. A plurality of spatial channels also can be correspondent to the selected from a plurality of can be used for transmitting the pre-encoding vector of the plurality of pre-coding vector. Channel information space can then be indicative of the selected pre-coding vector. Space state information can be said that each sub-band, each group of sub-band or all of a plurality of spatial channels of the sub-band.

Can obtain a plurality of sub-bands of a plurality of spatial channels CQI value (box 614). CQI value of the SNR estimates can be correspondent to the quality of the received signal or some other measured value. Can be in a plurality of spatial channels and a plurality of sub-bands CQI value of the differential coding to obtain differential CQI information (block 616). Differential CQI 1 forms information may include any information shown in (such as Y, ΔX, ΔY, and ΔΔX ΔΔY) and/or some other information. Differential CQI information and space state information can be used as a feedback is sent (block 618).

In box 614, CQI CQI value according to the reference value may be in a plurality of spatial channels and a plurality of sub-belt is differentially coded. The reference CQI value can refer to stator belt CQI value of the channel designated space, designated sub-band of the average of all spatial channels CQI value, and all spatial channels CQI value of the average of all of the sub-band, and so on. Reference CQI value may be transmitted together with the differential CQI information.

Box 614 of a differential encoding can be performed in various ways. CQI value may be the first of the plurality of spatial channels is a differential coding, then in a plurality of sub-bands is differentially coded. Alternatively, the first value can be CQI plurality of sub-bands are differential coding, then on a plurality of spatial channels is differential encoding.

A plurality of spatial channels may include a designated space channel and at least a channel designated space. A plurality of sub-band can include the designated sub-band and at least one of the sub-band is not designated. Each of the sub-bands are not at least one of the channel designated space of the at least one differential CQI value (for example Y_n) can be based on this sub-bands CQI value of the determining of the signal channel of space. For each undesignated sub-band, it may be determined that the failure of the designated sub-bands CQI value of the channel designated space with the designated sub-bands or adjacent sub-bands of the two channel designated space on one of the difference between the values CQI (for example Δ X_n). For each of the sub-band is not designated, may also determine the unspecified sub-band is not at least one of the channel designated space of the at least one differential CQI value (for example Y_n) with the designated sub-bands or one of the two adjacent sub-band is not at least one of the channel designated space of the at least one differential CQI value (for example Y_l, Y_n-1 or Y_n+1) the difference between (for example Δ Y_n). For each undesignated sub-band, designated CQI value of the difference of the signal channel of space (for example Δ X_n) and at least a channel designated space of the at least one differential CQI value (for example Δ Y_n) can be mapped to an index, it can be regarded as the differential of the sub-information CQI designated to transmit.

Figure 7 shows a space and frequency on the channel state information of a differential encoding device 700 design. Device 700 includes a plurality of sub-bands for determining a plurality of space the space of the signal channel state information module (module 712), is used for obtaining the plurality of sub-bands of a plurality of spatial channels CQI value module (module 714), in a plurality of spatial channels and a plurality of sub-bands CQI value of the differential coding to obtain differential CQI information module (module 716), the differentiating and CQI information and space state information as feedback to the sending module (module 718). Module 712-718 may include a processor, electronic equipment, hardware equipment, electronic components, logic circuit, memory, etc. or any combination of the above.

Figure 8 shows the report space, frequency and time of differential encoding in the process of channel state information 800 design. A plurality of sub-bands can be determined of a plurality of space the space of the signal channel state information (block 812). Can be over a plurality of time intervals to obtain a plurality of sub-bands of a plurality of spatial channels CQI value (block 814). Can be in a plurality of spatial channels, a plurality of sub-band and a plurality of time intervals CQI value of the differential coding to obtain differential CQI information (block 816). Differential CQI information and space state information can be used as a feedback is sent (block 818).

For box 816, can be in each time interval in a plurality of spatial channels and a plurality of sub-bands CQI value of the differential coding to obtain this differential CQI value of time interval (such as Y, and ΔX ΔY). In the first of the plurality of spatial channels are differentially encoded CQI value, then in a plurality of the plurality of sub-bands. Can include a plurality of time intervals designated time interval and the at least one not-specified time intervals. For each specified time interval, it may be determined that the undesignated time interval with the previous differential CQI value of the differential of the time interval of the difference between the values CQI (ΔΔX and ΔΔY, for example).

For box 818, designated CQI value of the differential time interval (such as Y, ΔX, ΔY, and so on) can be used as a designated time interval of the differential CQI information is sent. Each of the determined time interval has been designated a plurality of differential CQI value (for example ΔΔX, ΔΔY, and so on) can be used as the difference between the differential of the time interval designated CQI information is sent.

Figure 9 the report is shown in the space, differential coding of the frequency and of the time on the channel state information device 900 design. Device 900 includes, determining a plurality of sub-bands of a plurality of space the space of the signal channel state information module (module 912), over a plurality of time intervals to obtain a plurality of sub-bands in a plurality of spatial channels CQI value of the module (module 914), in a plurality of spatial channels, a plurality of sub-band and a plurality of time intervals CQI value of the differential coding to obtain differential CQI information module (module 916), the differentiating and CQI information and space state information as feedback to the sending module (module 918). Module 912 to the module 918 can include processor, electronic equipment, hardware equipment, electronic components, logic circuit, memory, etc. or any combination of the above.

Figure 10 shown isomerous the process of channel state information report 1000 design. When in the 1st mode of operation (such as scheduling mode) when under, can be according to 1st CQI information to report report mode (block 1012). When in the 2nd mode of operation (such as the non-deployment mode) when under, reporting mode according to the 2nd (such as non-scheduling mode) CQI information report (block 1014). CQI information can be in the report mode 1st 1st speed is sent, in the 2nd and 2nd speed to the report mode is sent. 2nd 1st rate may be slower than the rate.

The reporting mode 1st, from the can be obtained can be used for transmitting a plurality of sub-band selected among at least one of the sub-bands of a plurality of spatial channels CQI value. Can be in a plurality of spatial channels and at least one of the selected sub-bands CQI value of the differential coding to obtain the report mode 1st CQI information. CQI value can be in a plurality of selected sub-take, carry on average, but also a plurality of spatial channels CQI value may be the average of the differential coding.

For 2nd report mode, can be obtained and can be used for transmitting a plurality of sub-bands of a plurality of spatial channels CQI value. Can be in a plurality of spatial channels and a plurality of sub-bands CQI value of the differential coding to obtain 2nd CQI information of the report mode.

Figure 11 show heterogeneous the channel condition of the device the information report 1100 design. Device 1100 comprises, when in the 1st mode of operation when the (such as scheduling mode), can be according to the report report mode 1st CQI information module (module 1112), and the mode of operation when in the 2nd (such as non-scheduling mode) time, report can be in accordance with the 2nd mode (such as the non-deployment mode) CQI information report module (module 1114). Module 1112 and 1114 can include processor, electronic equipment, hardware equipment, electronic components, logic circuit, memory, etc., or any combination of the above.

Through OFDMA system can achieve substantial gains scheduling of the sub-band. However, in the system may be quite a number of the sub-band. Space-frequency differential CQI coding (e.g. FIG 4B in the programme report 4th) or space-frequency-time differential CQI coding (e.g. FIG 4C in the programme report 5th) MIMO-OFDMA can reduce the overhead of feedback in operation. Data stream can be the use of space diversity (such as the use of antenna arrangement, pre-coding, etc.) transmission. Space diversity can be generated to a single-input single-output (SISO) of the sub-transmission between the adjacent small changes in the SNR. SNR can be of relatively small changes in space and more effectively two-dimensional differential coding on the frequency.

The technology described herein can be achieved through a variety of modes. For example, these techniques can be hardware, firmware, software or a combination thereof to achieve. For hardware implementation, of the technique used for the implementation of the processing units can be one or a plurality of application-specific integrated circuit (ASIC), digital signal processor (DSP), digital signal processing device (DSPD), programmable logic device (PLD), field programmable gate array (FPGA), processor, controller, microcontroller, microprocessor, electronic equipment, used for carrying out the function of the design of the other electronic unit described herein, in a computer or a combination of the above.

The firmware and/or software implementation, the technology described herein can be utilized to the functional module of the implementation (such as a procedure, function, etc.) to achieve. Firmware and/or software instructions can be stored in the memory (e.g. FIG 1 in a memory 192), and the processor (such as processor 190) implementation. The memory may be in the processor to realize the inside or outside the processor. Firmware and/or software instructions may also be stored in other processor-readable medium, such as a random access memory (RAM), read-only memory (ROM), non-volatile random access memory (NVRAM), programmable read-only memory (PROM), electrically erasable PROM (EEPROM), flash memory, optical disk (CD), magnetic or optical data storage device, and so on.

The present disclosure is to provide for a description of any technical personnel in this field can be manufacture or use of the present invention. Various modifications of the present disclosure to the technicians of this field will be obvious, and the general principles defined herein may be applied to the other variation, and does not deviate from the real or scope of the present disclosure. Therefore, the invention is not to be limited to the described embodiment, but rather to and disclosed herein is consistent with the principles and novel feature consistent with the most broad range.