METHOD AND APPARATUS FOR CONTROLLING OPERATION OF AN ACCESS TERMINAL IN A COMMUNICATION SYSTEM

Of access terminal the present invention refers to an efficient control of the operation for provides device and method. The present method improvements in and relating to the device of a communication system broadcasting of control messages to capsule (capsule) detects a beginning of, such based on a detection of handing off an access terminal process disabling steps and means including. Of access terminal operation controlled by the hand-off process for demodulating signal termination of prematurely decoding process such a manner as to avoid the controlled. Access the terminal while for conserving battery power, normal (wake up) a selection circuit/sleep mode of a. the reception in cycle period (sleep). Broadcasting of control messages to after detecting the beginning of the capsule, has a series of predetermined data pattern, the not data bits by the preamble of the capsule of control messages to access terminal upon a failure is detected, the access terminal enables handoff process. After detecting the preamble, the access terminal subsequent to the preamble detected packet lengths broadcast is based on the determination of next capsule of control messages to. determine the beginning of the data packet. The access terminal next start time of subsequent data packet for searching the preamble. The next access terminal upon a failure detecting preamble, enables handoff process the access terminal.

After detecting the preamble, preamble detected the access terminal decodes subsequent data to. Access terminal upon detecting any passengers in an decoded data of failures, enables handoff process the access terminal. Subsequent to the preamble detected after decodes data, access terminal end of the capsule of control messages to broadcasting (end) upon detecting a, enables handoff process the access terminal.

Characterized of the present invention, and reference to drawing to advantage, to plates are parallel each other, and a preferred embodiment will.

Generally, signal from an access point in a communications system while controlling the operation of access terminal is a novel and improved method and device are shown. Various aspects include devices of the present invention of access terminal demodulator or decoder received from the access point to demodulate the control messages sent by the node access terminal when or decoding disabled handoff process. provides the functions of either. Handoff process of access terminal operation relates to a control signal for demodulating prematurely decoding process to prevent termination of is controlled in such a way that. As a result, access the terminal normally while for conserving battery power the wake-up/sleep mode of a cycle may continue operation in. Wherein one or more which is presented to the user in the embodiment are digital wireless data communication system in which substantially is described. Such that the ratio of these digital using over a wireless data communication system but is preferred, other in the embodiment of the present invention different conditions and implementations. can be realized. Generally, various system described wherein software-controlled processors, integrated circuits using logic or discretely can be formed. The present specification referred to in data, command, command, information, signal, symbols and chips are preferably voltages, currents, electromagnetic waves, magnetic fields or molecules, optical fields or molecules or a combination thereof. may be represented by. Furthermore, each block diagram illustrating that are presented in blocks are hardware or method can exhibit steps.

Various in particular of the present invention in the embodiment (TIA) association communication center are standardized and other various which is published by the mechanisms that are presented in standards code division multiple access (CDMA) according to the description in a wireless communications system that operates may be incorporated. Such standards TIA/EIA-95 standard, TIA/EIA-IS-2000 standard, standard IMT-2000, UMTS and includes standard WCDMA, these standard is a reference in the present specification. Data communication a system for the present specification referenced in "TIA/EIA/IS-856 cdma2000 high rates of DOCSIS MAC error packet data" is described. Http://www.3gpp2.org an Internet address copy of that these standards or connected to, American 22201 main growth promotant, the ring tone which it will know , then blue Wilson 2500, spaced-apart address to business and techniques standard TIA surface acoustic to can be available through the request. The present specification, which are referred to standard UMTS referenced in 3GPP Support Office standard, 650 Route des Lucioles-Sophia Antipolis, Valbonne, by request the France. may be obtained.

In the embodiment incorporating any various Figure 1 of the present invention in a code division multiple access (CDMA) communication system standards, capable of operating according a communication system (100) of. block diagram illustrating this. Communication system (100) a voice, data or both, can be performing communication. Generally, communication system (100) the access terminals (102 to 104) between access terminals a plurality access terminals (102 to 104) and public switched telephone/data network (105) between an access point which provides the communications links (101) includes. Various advantages of the present invention main range of Figure 1 without deviating from the access terminal from a mobile station which are designated (AT) example, access point (AP) example. may be referred to to the base station. AP (101) the AP controller and AP transceiver system components of a plurality may have. For simplified, has is decided of these components. AP (101) for example AP (160) additions of other gases such as AP can communicate with a large. AP (160 and 101) and various control nodes (not shown) for including access network (AN) the communication system (100) of various operating aspects and network (105) and an access point (160 and 101) between a back-hole (199) for controlling relations to can be.

AP (101) the AP (101) a forward link transmitted from, through signals AT each locations in the coverage area of the. to communicate with an. Access terminals (102 to 104) the target as which are summed forward link signal the forward link signal (106) to form a. A number of different forward link including forward link channel. Operable to receive control information an access terminal, a controllable heating supply which can be shareable among a number can be also includes channel. Such control channel control information to all access terminals may be used the for broadcasting. Communication systems are highly many access terminals since the may involve, for a group of access terminals a broadcast control for segmented message transmission wherein over a period of time can be distributed.

For example, in system IS-856, each AP the 426.7ms once for each time a control message at a broadcasting capsule. Electric power is being supplied to the access point the TSF-counter AT flow through one of the registered, 5.12 426.7ms in period in seconds of a access network 12 of possible AT a channel cycle one of the assigned to. The access AT which travels in an elevator shaft between points holds the cycle allocation the first case. Forward link signal (106) access terminals receiving (102 to 104) each information targeted to the user so as to extract the forward link signal (106) decodes. Therefore, each AT AT the AP is to attempt to transmit control message to determine the whether every 5.12 broadcasting at least one bank active signals is per. monitoring a control channel. 5.12 per every has AT at wake-up by the decodes demodulate and control message. Each is assigned a unique the AT. However of the control message preamble allows the all access terminals is encoded in common code known to. AT preamble control message is broadcast to successfully decode a lower surface, AT has preamble data continue the decoding of subsequent data. AT predetermined the message broadcasting of control messages to capsule is integrated. Therefore, any message is AT AT transmission on the to determine whether or not the all of messages is necessary that and decode demodulating capsule. Broadcasting of control messages to capsule of an end part of said of the messages the smell fo liquor the cap for indicating the message that is adapted to be integrated has the termination message data.

During control channel cycle assigned, control message AT upon a failure detecting preamble of the capsule, then enters and a sleep mode AT control channel cycle wake on up. To detect the preamble is AT, subsequent to the preamble data lower decodes shch data that is unsuccessful, AT terminal broadcast control channel monitoring of entry into sleep mode in a request of the.. A message of the any whether destined AT in order to monitor the, AT following the next control channel cycle wake on up. To detect the preamble is AT, preamble subsequent to the successfully decoded the data lower surface, AT. in response to the terminal. This message is a paging message for an AT. Such the paging message on another channel is AT need to thereby allowing monitoring of the can include an indication. Such the paging message by a predetermined serve the communication link with AT AP can be used by. Apparatus responds AT of the capsule of control messages to broadcasting without but also for indicators message if the comparator detects a (end), then enters and a sleep mode AT control channel cycle wake on up.

AP (160) the AP (160) a forward link transmitted from, through signals locations in the coverage area of the access terminal can communicate with a large. Control message for broadcast and reception of the capsule the similar operations locations in the coverage area of the access terminals AP (160) and can be performed by. Access terminals (102 to 104) a corresponding reverse link the access points (106 and 101). is capable of communication with. Access terminals respective reverse link (102 to 104) signals the reverse link for each (107 to 109) reverse link signals, such is held by. Reverse link signals (107 to 109) to AP one even if the target but, different access points to be can be both received.

Access points (160 and 101) handoff AT one common during the process for attempting communication, and simultaneously with the can be. The hand-off process from the AP one a communication link to convert a AP is process (hand off). For example, AT (102) the access points (160 and 101) that can hold communication with both with access points can be proximity is positioned at a set distance. Including at random times such handoff period, forward link in a, AP (101) has the forward link signals (106) through the control message capsule and can broadcast, AP (160) the forward link signal (161) through the control message to broadcast capsule. AT (102) is forward link signal (106) broadcast of control messages to that attempt demodulation of the capsule during, . capable of the hand-off process. Forward link (106) transmits the broadcasting in capsule of control messages to for demodulating decoding prior to completion of the handoff process accommodates the occurs to produce a, AT (102) prematurely termination of the demodulation processes and the other broadcasting of control messages to capsule-coupling forward (161) monitoring is especially disclosure. Therefore, AT (102) the access point (101) transmits the broadcasting from capsule of control messages to is not authorized, determining complete the decoding for demodulating, AT (012) the sleep period is prevent. As such, the handoff process inhaling room air, and a second access points (awake) state is maintained for as long as the signal or a noise than cause the computer system to perform process signals battery power resource is especially are moved vertically. Such turning unit, the according to various aspects of the present invention, broadcast of control messages to capsule until being detected the termination of, preventing completion process receives a handoff AT each of any of handoff process disables starting.

On the reverse link, AT (102) the access points (160 and 101) by both the received reverse link signal (107) a packet suitable for an ieee802.. AT (102) transmitted to the data packet to, access points (160 and 101) one of access terminal (102) to a switching arrangement for transporting data packets can be selected. On the reverse link, access points (160 and 101) an access terminal, a both (102) traffic therefrom. perform decoding for the data transmission. Reverse and a forward link of data rate and power level between AT AP and. is maintained based on a channel state or a. AT away from the number 1 AP is, the forward link from number 1 AP sufficient error rate for maintaining communication link in appropriate level so that they do not reach the to AT will. This case, and should terminate process handoff, a number 2 AP AT serve the communication link with the free surfaces mounted on an. Handoff and very quickly process, . on a moving velocity of AT.

AT has idle mode or traffic mode state can be. Traffic mode, the, active with the AT AP has traffic link. In the idle mode, the assigned cycle controlled during the AT to receive that message. monitoring a control channel. During idle mode, number 1 AP is AT capsule the broadcasting message is transmitted from the lower decoding, broadcast message capsule and continues decoding for demodulating, AT is broadcast message when it detects a beginning of the capsule AT process is disabled in handoff. Broadcast message for a communication system to the beginning of the capsule (100) timing and AT control channel cycle assigned to can be detected based on. AT if the comparator detects a beginning of a broadcast message is, information relating to process receives a handoff AT in order to process will not be, broadcast message in accordance with various aspects of the present invention of the capsule before the completion of process completing handoff process prevents. Handoff process number 1 AP communication link extracts a completion of a request of the disclosure a communication link new with number 2 AP as to.

Various aspects include also flow of Figure 2 of the present invention (240) to be presented to the reference to a variety of operations is described. Flow also (240) presented steps and functions are AT of controller or is carried out by the processor. Step (241) in, a broadcast of control messages to AT beginning of the capsule is detected. Broadcasting of control messages to a beginning of the capsule AT memory is used to store measured by a system timing can be detected based on. Step (242) in, converted start handoff process is AT, any AT preventing completion of the hand-off process disables the operation a hand-off. The present embodiment according to disclosure handoff process based on channel conditions need in the presence of, AT receives a handoff process collecting data able to start the hand-off process and.; however, AT is the according to various aspects of the present invention, step (241) broadcast of control messages to the future notification for detecting beginning of the capsule AT completes the handoff process may not.

Broadcasting of control messages to each packet of the preamble in a capsule and having. Step (243) in, a search data preamble has AT. Preamble allows the broadcasting of control messages to each packet of capsule has a series of specific pattern in is data bits. Therefore, preamble search the preamble pattern matched with the series of data bits and of finding such stored elements.. Step (244) in any preamble detection is not, said process the step for enabling handoff process (245) moves to. Wherein, if there is need completion of the handoff process, . completes the handoff process AT. Preamble this step (244) in detected, said exposing process flows (240) step (245 and 249) moves to. Step (245) in, AT has preamble data subsequent data to attempt a demodulated and decoding. Step (246) in, in data to be decoded has AT inspection the indication. Data does not have any failure without decoded, said exposing process flows step (247) it is moved into that decoded video protocol layer, transmits it. Data is unacceptably type of failures has decoded (for example, cyclic redundancy check (CRC) by does not extend above the slit), said exposing process flows step (253) enables it is moved into that handoff process. Most display messages fail poor of signals received is installed to enclose and heat the noise conditions. arranged separately from one another. In one example, poor signal to noise ratio broadcast control messages of capsules configuration, and sends the moves away is AT AP from. direction for detecting the intensity of radiation.

Step (244) after detecting the preamble in, the exposing process flows said in addition step (249) subsequent to the preamble are arranged to be kept away from and decides the packet lengths. Subsequent to the preamble packets of data rate and packet lengths detected based on patterns of the delays can be determined. Step (250) in packet lengths based on the information, said exposing process flows a broadcast packet amount 'Y' of the music in a capsule and of control messages to beginning unit.. Step (251) in, corresponding a start time the expected preamble then at the appropriate latency after, said exposing process flows step (243) went back to preamble this step (244) whether detected in the to determine the control message in a capsule and finds preamble other. Furthermore, step (247) in said exposing process flows (240) decoded data packets and releasing step and then recombines them and delivers the layer, (248) moves to. Step (248) in, said exposing process flows a broadcast of control messages to capsule the termination of. determine whether the is reached. A the termination message packets the messages in can be determined by decoding. Upon detection of the termination message, said exposing process flows step (253) enables it is moved into that handoff process. If that they do not reach the is still the termination message, said exposing process flows (240) step (251) it is moved into that step (244) for searching the preamble to another.

Figure 3 of the present invention according to various aspects, which works, received CDMA signal processing and demodulates using the same are (200) of. block diagram illustrating this. Receiver (200) the reverse and a forward link signals is carried out by using an acidulous decode information on. Receiver (200) adds the basic channel, control and auxiliary channels is used in detecting information on. Receiver (200) in accordance with various aspects of the present invention the that operate in broadcast AT delivery of capsules control messages are used to processing signals. Received (RX) samples are RAM (204) are stored in. Received samples a wireless frequency/intermediate frequency (RF/IF) system (290) and an antenna system (292) are generated by. RF/IF system (290) and an antenna system (292) the reception diversity gain for using multiple receiving signals, signals that are received for processing RF/IF including one or more components. Different propagation path and the signals which are received via common source may be from. Antenna system (292) the RF receiving signals, RF/IF system RF signals (290). delivering. RF/IF system (290) the any existing RF/IF can be receiver. RF signals are received is filtered, are duplexer and, electromagnetic, is digitized form samples RX in frequency band. Such sample a multi-multiplexer (MUX) (252) is provided. Multiplexer (252) output of a searcher unit (206) and a finger element (208) is provided. Control system (210) and is coupled to these. Coupler (212) a decoder (214) fingerprinting element (208) to connected to. Control system (210) microprocessor controlled by software may be, separate integrated circuit or may placed on the same circuit. Decoder (214) decoding function turbo decoder or any other suitable. conform to the decoding algorithm. Various the signals to be transmitted from a source code is encoded through layers. Decoder (214) the 2 decoding according to one or more code can be function. For example, transmitted data 2 two different layers in (external layer and physical layer) may be encoded. Follow a common turbo code the physical layer, external layer can be along reed-Solomon codes. As such, decoder (214) samples received decodes according to these codes.

During operation period, received samples that as a diplexer, (252) is provided. Multiplexer (252) the samples searcher unit (206) and a finger element (208) provides to. Control unit (210) a searcher unit (206) based on the search results from different time offsets and in despreading is demodulation and for signals received to perform finger element (208) to composed of. Decoder are combined to result of these demodulators (214) is transferred to a. Decoder (214) has such a data and decodes outputs the decoded data. Home one time despreading channels a Walsh function and PN being conjugate complex sequence of multiplication samples received, often integrating and dump an accumulating circuit (not shown) to form a result through digital samples is carried out by filtering the. Receiver (200) has access terminals reverse link signals received from the access points for processing a (160 and 101) receiving part of and when it was received forward link signals processing any access terminal can be used in a receiving part of.

Decoder (214) for detecting data symbol has coupling energy can be accumulates a. Each data packet the cyclic redundancy check (CRC) field material may have a. Decoder (214) a control system (210) or other control systems error of a data packet being received can thus verify by means of. If pass data is CRC, a data packet that received the recording operation. received in error. Receiver (200) the ASIC, DSP and in a variety of ways such as a microprocessor may be embodied in. The processing of data decoded however the receiver (200) connected by a processor that is be. Receiver (200) on received signals by a a wide processing of because the time-consuming method, receiver (200) are many aspects of be autonomously. For example, pilot signal search, wherein the various signals of demodulation and decoding autonomously disclosure can be go and done. In a particular example, receiver (200) is broadcast control messages of capsules including signal processing when disclosure, said received from control processor process ends commands can be. These commands handoff process can be caused by a high-. The according to various aspects of the present invention, the of the plurality of demodulators or decoder AT AP is received from the control messages sent by the node to demodulate and decode disables handoff process when operating in a. A receiver terminal AT (200) such as receiver, transmitter and a processor includes. AT the operation of the controlled by the hand-off process for demodulating signal prematurely decoding process to prevent termination of is controlled in such a way that. As a result, the AT for conserving battery power/sleep mode of a wake-up the normally while the reception a in each of the cycles.

Figure 4 broadcasting of control messages to for processing a signal carrying the capsule includes, for maintaining communication link destination and a receiver for (200) and transmitter (300) integrating a transceiver system (400) is capable of being isolated from. diagram illustrating this. Transceiver (400) a transmitter in (300) the CDMA standard suitable for transmission signal according to publicly known can be any transmitter. Transceiver (400) a transmitter in (300) the AT AP or may be incorporated in. Processor (401) has receive and transmit the receiver for processing data (200) and transmitter (300) and a are connected. Although transmitter (300) and receiver (200) has been individually but be presented, receiver (200) and transmitter (300) of a variety of aspects include devices. common. In one aspect, receiver (200) and transmitter (300) for receive and transmit the RF/IF common local oscillator and common antenna system (499) sharing a. Transmitter (300) the input (405): this recorder receives data for transmission in. Transmission data processing block (403) the transmission channels for preparing the data for transmission in. Decoder (214) after decoded in, received data an input (404) processors in (401) is received. A processor data received (401) in received data processing block (402) is processed in. Processor (401) activities are to be various plurality of processes one or may be incorporated in. Transceiver (400) to the other, the hand of the device may be connected to. Transceiver (400) is essential component of the device. Said device is a computer and operates similar to computer or. Said device such as the Internet may be connected to to a data network. At an access point said transceiver (400) when integrating a, access thereof through the several connections to a network such as Internet point may be connected to.

The processing of data received received in is generally and for testing the error in packets data.. Received data storage blocks (480) the entire data block is constituted from the data packets over each. accumulates data that received. Entire data block transmitted from a source to form a complete message. Received data processing block (402) and a processor coupled (401) the of the present invention according to various aspects the handoff process also flow to enabled or disabled (240) performs a variety of aspects of. For example, step (242) for a handoff in a disabled and step (253) [...] handoff in the processor in accordance with various aspects of the present invention (401) to a receiver (200) and passed to the. Preamble search step (243) and determining been detected the preamble (244) the receiver (200) be in. Results are step (243) a handoff in a determine judged received CDMA signal for data processing unit (402) the processors through the (401) is transferred to a. Therefore, flow also (240) of various steps the processor (401) and is done by carrying-out units, other various steps in a receiver (200) is carried out by.

In several exemplary examples logical blocks, conventional and circuit modules the purpose of processor; digital signal processor, DSP; specific integrated circuit, ASIC; digital Dll, FPGA; or other programmable logic device; discrete gate or transistor logic; discrete hardware components; such is designed to also implements function that the implemented via a combination of can be or implementation. A second for generally but may be; alternatively in in the embodiment, these processors existing processor, controller, microcontroller or state machine can be. Processor for example, DSP and a microprocessor, plurality of microprocessors, DSP core combined with one or more microprocessors or calculated, such as combination of such configurations can be realized as combination of device.

The above-mentioned method steps of and algorithms in hardware, a software module executed by the processor directly by or a combination thereof may be embodied in. Software modules that a random access memory (RAM); flash memory; read only memory (ROM); electrical programmable ROM (EPROM); electrical erasable programmable ROM (EEPROM); register; hard disk; to a removable disk; compact disk ROM (CD-ROM); or publicly known in, or of randomly present in as. An exemplary storage medium coupled to the processor and by the, processor reads out the information from a storage medium, which for recording information on storage medium.. Alternatively, storage medium can be is a component of. These processors and storage medium the ASIC. User ASIC can be terminal. Alternatively, user terminal file system information processor and other formerly discrete components in. metal may be present as an.

Invention the above-mentioned in the embodiment herein is one skilled in the art are axes of X-Y directions for the charges from the first and second embodiment is described. Various of these in the embodiment are that a modified respectively removing noise by using noise source code to one skilled in the art, the present specification principles general defined in the invention functions in the embodiment the use of can be applied to. Thus one skilled in the art here the above invention not be limited to in the embodiment of the present invention technical idea based on and little changeable will understand.