HK1193295B - Method and apparatus for random access in an orthogonal multiple-access communication system - Google Patents

Description

Method and apparatus for random access in an orthogonal multiple access communication system

The present application is a divisional application filed on the application of 21/08/2007 under the name "method and apparatus for random access in an orthogonal multiple access communication system", with the application number 200780030971.9.

The present application claims priority from U.S. provisional application No.60/839,220, entitled "A METHOD AND APPATUS FOR ACCESS PROCESS FOR ORTHOGONAL MULTIPLE ACCESS SYSTEMS", filed on 21.8.2006, U.S. application No.60/828,058, filed on 3.10.2006, entitled "A METHOD AND PARATUS FOR ACCESS," filed on 3.10.2006, AND U.S. application No.60/863,610, filed on 31.10.2006, entitled "A METHOD ANDAPPARATUS FOR ACCESS PROCESS FOR ORTHOGONAL MULTIPLE ACCESS SYSTEMS", all of which are assigned to the assignee of the present application AND are incorporated herein by reference.

Technical Field

The present disclosure relates generally to the field of communications, and more specifically to techniques for accessing a wireless communication system.

Background

Wireless communication systems are widely deployed to provide various communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be multiple-access systems capable of supporting multiple users by sharing the available system resources. Examples of such multiple access systems include: code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal FDMA (OFDMA) systems, and single carrier FDMA (SC-FDMA) systems.

A wireless communication system may include any number of base stations capable of supporting communication for any number of User Equipments (UEs). Each UE may communicate with one or more base stations via transmissions on the downlink and uplink. The downlink (or forward link) refers to the communication link from the base stations to the UEs, and the uplink (or reverse link) refers to the communication link from the UEs to the base stations.

When a UE desires to gain access to the system, the UE may send an access probe (accessprobe) on the uplink. The base station may receive the access probe and respond with an access grant (access grant), which may include pertinent information for the UE. The access probe is sent using uplink resources and the access grant is sent using downlink resources. Accordingly, there is a need in the art for techniques to support system access with as little overhead as possible in order to improve system capacity.

Disclosure of Invention

Techniques for efficient access to a wireless communication system are described herein. In one design, the UE may send a random access preamble (or access probe) for system access. The random access preamble may include a random Identifier (ID), a downlink Channel Quality Indicator (CQI), and the like. For example, during handover, the UE may randomly select a random ID, or the UE may be directly or indirectly assigned the random ID (in the assigned random access preamble/access sequence). The random ID may be used as identification information of the random access preamble and may allow the base station to asynchronously respond to the random access preamble.

The UE may receive a random access response (or access grant) from the base station. The random access response may include control channel resources, uplink resources, control information, an assigned ID, etc. for the UE. The control channel resources may include CQI resources used by the UE to transmit CQI on the uplink, PC resources used to transmit Power Control (PC) corrections on the downlink to the UE, and so on. The control information may include a timing advance for adjusting the transmission timing of the UE, a PC correction for adjusting the transmission power of the UE, and the like. The random access response may be sent in two parts using two messages. The first message may be transmitted on a control channel (e.g., PDCCH) of a shared data channel (e.g., PDSCH). The second message may be sent on a shared data channel. The first message may include identification information of a random access preamble or a random access channel used to transmit the random access preamble, downlink resources of the shared data channel, and possibly other information. The second message may include remaining information of the random access response. The UE may exchange control information using the allocated control channel resources and may transmit data using the allocated uplink resources.

Various aspects and features of the disclosure are described in further detail below.

Drawings

Fig. 1 shows a wireless multiple-access communication system.

Fig. 2 shows a block diagram of a base station and a UE.

Fig. 3 to 9 show message flows of various random access procedures.

Fig. 10 through 25 illustrate various processes and apparatuses for a UE and a base station for system access by the UE.

Detailed Description

The techniques described herein may be used for various wireless communication systems such as CDMA, TDMA, FDMA, OFDMA, SC-FDMA and other systems. The terms "system" and "network" are often used interchangeably. A CDMA system may implement a radio technology such as Universal Terrestrial Radio Access (UTRA), CDMA2000, etc. UTRA includes wideband CDMA (W-CDMA) and Low Chip Rate (LCR). cdma2000 covers IS-2000, IS-95 and IS-856 standards. TDMA systems may implement radio technologies such as global system for mobile communications (GSM). OFDMA systems may implement methods such as evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE802.11 (Wi-Fi), IEEE802.16 (WiMAX), IEEE802.20, and,And so on. UTRA, E-UTRA and GSM are part of the Universal Mobile Telecommunications System (UMTS). The 3GPP Long Term Evolution (LTE) is an upcoming release of UMTS that uses E-UTRA, which employs OFDMA on the downlink and SC-FDMA on the uplink. UTRA, E-UTRA, GSM, UMTS, and LTE are described in documents from an organization named "third Generation partnership project" (3 GPP). Cdma2000 and UMB are described in documents from an organization named "third generation partnership project 2" (3 GPP 2). The various radio technologies and standards are well known in the art. For clarity, certain aspects of the techniques are described below for system access in LTE, and LTE terminology is used in much of the description below.

Fig. 1 illustrates a wireless multiple-access communication system according to one design. For simplicity, fig. 1 shows only two evolved node bs (enbs) 100 and 102. The eNB100 includes multiple antenna groups, one including antennas 104 and 106, one including antennas 108 and 110, and another including antennas 112 and 114. In fig. 1, only two antennas are shown for each antenna group. However, more or fewer antennas may be utilized for each antenna group. Generally, an eNB is a fixed station used for communicating with UEs and may also be referred to as a node B, a base station, an access point, etc.

UE116 is in communication with antennas 112 and 114, where antennas 112 and 114 transmit information to UE116 via downlink 120 and receive information from UE116 via uplink 118. UE122 is in communication with antennas 106 and 108, where antennas 106 and 108 transmit information to UE122 via downlink 126 and receive information from UE122 via uplink 124. In general, a UE may be fixed or mobile and may also be referred to as a mobile station, a terminal, an access terminal, a subscriber unit, a station, etc. The UE may be a cellular phone, a Personal Digital Assistant (PDA), a wireless communication device, a handheld device, a wireless modem, a laptop computer, or the like. In a Frequency Division Duplex (FDD) system, communication links 118, 120, 124 and 126 may use different frequency for communication. For example, the downlinks 120 and 126 may use one frequency, while the uplinks 118 and 124 may use another frequency.

The overall coverage area of the eNB100 may be divided into multiple (e.g., three) smaller areas. These smaller areas may be served by different antenna groups of the eNB 100. In 3GPP, the term "cell" can refer to the smallest coverage area of an eNB and/or an eNB subsystem serving that coverage area. In other systems, the term "sector" may refer to the smallest coverage area and/or a subsystem that provides services to that coverage area. For clarity, the 3GPP concept of a cell is used in the following description. In one design, three antenna groups of eNB100 support communication for UEs in three cells of eNB 100.

Fig. 2 shows a block diagram of a design of an eNB100 and a UE 116. In this design, the eNB100 is equipped with T antennas 224a through 224T and the UE116 is equipped with R antennas 252a through 252R, where generally T ≧ 1 and R ≧ 1.

At the eNB100, a Transmit (TX) data processor 214 may receive traffic data for one or more UEs from a data source 212. TX data processor 214 may process (e.g., format, encode, and interleave) the traffic data for each UE based on one or more coding schemes selected for that UE to obtain coded data. TX data processor 214 may then modulate (or symbol map) the coded data for each UE based on one or more modulation schemes (e.g., BPSK, QSPK, M-PSK, or M-QAM) selected for that UE to obtain modulation symbols.

TX MIMO processor 220 may multiplex the modulation symbols for all UEs with pilot symbols using any multiplexing scheme. The pilot is typically known data that is processed in a known manner and may be used by the receiver for channel estimation and other purposes. TX MIMO processor 220 may process (e.g., precode) the multiplexed modulation symbols and pilot symbols and provide T output symbol streams to T transmitters (TMTR) 222a through 222T. In some designs, TX MIMO processor 220 may apply beamforming weights to the modulation symbols in order to spatially direct the symbols. Each transmitter 222 may process a respective output symbol stream, e.g., Orthogonal Frequency Division Multiplexed (OFDM), to obtain an output chip stream. Each transmitter 222 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output chip stream to obtain a downlink signal. T downlink signals from transmitters 222a through 222T may be transmitted via T antennas 224a through 224T, respectively.

At the UE116, antennas 252a through 252r may receive the downlink signals from the eNB100 and provide received signals to receivers (RCVR) 254a through 254r, respectively. Each receiver 254 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain samples, and may further process the samples (e.g., for OFDM) to obtain received symbols. MIMO detector 260 may receive received symbols from all R receivers 254a through 254R and process the received symbols based on MIMO receiver processing techniques to obtain detected symbols, which are estimates of the modulation symbols transmitted by eNB 100. A Receive (RX) data processor 262 may then process (e.g., demodulate, deinterleave, and decode) the detected symbols and provide decoded data for UE116 to a data sink 264. In general, the processing by the MIMO detector 260 and the RX data processor 262 is complementary to the processing by the TX MIMO processor 220 and the TX data processor 214 at the eNB 100.

On the uplink, at the UE116, traffic data and signaling messages from a data source 276 may be processed by a TX data processor 278, further processed by a modulator 280, conditioned by transmitters 254a through 254r, and transmitted to the eNB 100. At the eNB100, the uplink signals from the UE116 may be received by the antennas 224, conditioned by the receivers 222, demodulated by a demodulator 240, and processed by a RX data processor 242 to obtain the traffic data and messages transmitted by the UE 116.

Controllers/processors 230 and 270 may direct the operation at eNB100 and UE116, respectively. Memories 232 and 272 may store data and program codes for eNB100 and UE116, respectively. Scheduler 234 may schedule UEs for downlink and/or uplink transmissions and may provide resource allocations for the scheduled UEs.

The system may support one set of transport channels for the downlink and another set of transport channels for the uplink. These transport channels may be used to provide information transfer services to Medium Access Control (MAC) and higher layers. The transport channel can be described by how and with what characteristics the information is sent over the radio link. The transport channels may be mapped to physical channels, which may be defined by various attributes such as modulation and coding, mapping of data to resource blocks, and so on. Table 1 lists some physical channels used for Downlink (DL) and Uplink (UL) in LTE according to one design.

TABLE 1

Other physical channels may also be used for paging, multicasting, etc. Physical channels may also be referred to by other names. For example, PDCCH may also be referred to as Shared Downlink Control Channel (SDCCH), layer 1/layer 2 (L1/L2) control, and so on. The PDSCH may also be referred to as a downlink PDSCH (DL-PDSCH). The PUSCH may also be referred to as an uplink PDSCH (UL-PDSCH).

The transport channels may include a downlink shared channel (DL-SCH) for transmitting data to the UE, an uplink shared channel (UL-SCH) for transmitting data by the UE, a Random Access Channel (RACH) for accessing the system, and the like. The DL-SCH may be mapped to a PDSCH and may also be referred to as a downlink shared data channel (DL-SDCH). The UL-SCH may be mapped to a PUSCH and may also be referred to as an uplink shared data channel (UL-SDCH). The RACH may be mapped to the PRACH.

At any time the UE desires access to the system, the UE may transmit a random access preamble on the uplink, e.g., if the UE has data to transmit or if the UE is paged by the system. The random access preamble may also be referred to as an access signature, access probe, random access probe, signature sequence, RACH signature sequence, etc. As described below, the random access preamble may include various information types and may be transmitted in various manners. The eNB may receive the random access preamble and may respond by transmitting a random access response to the UE. The random access response may also be referred to as an Access Grant (AGCH), an access response, etc. As described below, the random access response may carry various types of information and may be sent in various ways. The UE and node B may also exchange signaling to establish a radio connection and may thus exchange data.

It is beneficial to provide the allocated resources and control information in a random access response in order to speed up the communication between the UE and the eNB. However, many bits may be used to convey resource allocation and control information. In an aspect, as described below, the random access response may be partitioned into multiple portions that may be efficiently transmitted on the PDCCH and PDSCH. In another aspect, the eNB may asynchronously respond to the random access preamble and may use various mechanisms to identify the random access preamble, as described below.

Fig. 3 shows a message flow of a design of a random access procedure 300. In this design, the UE may access the system by transmitting a random access preamble, for example, in response to data arriving at the UE transmit buffer (step a 1). The random access preamble may comprise L bits, where L may be any integer value. Can be in 2^LAn access sequence is selected from a pool of available access sequences and transmitted for a random access preamble. In one design, the random access preamble may include L ═ 6 bits, and one access sequence may be selected in a pool of 64 access sequences. The access sequence may be of any length and may be designed to have good detection characteristics.

In one design, the random access preamble may include (i) a random ID, which may be pseudo-randomly selected by the UE, and (ii) a downlink CQI, which indicates a downlink channel quality measured by the UE. The random ID may be used to identify a random access preamble from the UE. The downlink CQI may be used to send subsequent downlink transmissions to the UE and/or to allocate uplink resources to the UE. In one design, the 6-bit random access preamble may include a 4-bit random ID and a 2-bit CQI. In another design, the 6-bit random access preamble may include a 5-bit random ID and a 1-bit CQI. The random access preamble may also include different and/or additional information, and each type of information may include any number of bits.

The UE may determine an implicit radio network temporary identifier (I-RNTI), which may be used as a temporary ID for the UE during system access. The UE may be identified by an I-RNTI until the UE is assigned a more permanent ID, such as a cell RNTI (C-RNTI). In one design, the I-RNTI may include the following:

system time (8 bits) -time when the UE sends the access sequence, and

RA preamble identifier (6 bits) -index of access sequence transmitted by UE.

The RA preamble identifier may be an L-bit value of a random access preamble being transmitted by the UE. The RA preamble identifier may also be referred to as a random access preamble identifier, an access signature index, etc.

The I-RNTI may have a fixed length (e.g., 16 bits) and may be padded with a sufficient number of zeros (e.g., 2 zeros) to reach the fixed length. The UE may transmit the access sequence in the access slot present in each frame. The system time may then be given in frame units. 8-bit system time is accurate for 256 frames. If the frame has a duration of 10 milliseconds (ms), the I-RNTI is valid for 2560ms with an 8-bit system time. In another design, the I-RNTI includes a 4-bit system time, a 6-bit RA preamble identifier, and padding bits (if needed). In this design, the I-RNTI is valid for 160 ms. In another design, a frequency slot may be used for the RA preamble identifier or the system time. In general, the I-RNTI may be formed of any information that (I) allows independent addressing of the UE or random access preamble and (ii) reduces the likelihood of collision with another UE using the same I-RNTI. The lifetime of the I-RNTI may be selected based on a maximum expected response time for an asynchronous response to the random access preamble.

The eNB may receive a random access preamble from the UE and may respond by transmitting a random access response to the UE. The eNB may determine the I-RNTI of the UE in the same manner as the UE. Since the I-RNTI is valid within a certain time window or time-to-live (e.g., 2560ms with 8-bit system time), the eNB may respond at any time within the time window. However, the eNB may typically respond in a shorter time interval (e.g., within 40 to 80 ms) in order to save complexity and improve system access response time. Thus, the I-RNTI may allow the eNB to address the UE and respond asynchronously to the random access preamble from the UE.

The eNB may transmit a random access response to the UE on the PDCCH and the PDSCH (steps a2 and A3). In one design, the PDCCH may carry messages that include:

I-RNTI-identifying the UE that is the recipient of the access grant sent by the eNB,

timing advance (timing advance) -indicating an adjustment to the transmission timing of the UE,

UL resources-indicating the resources the UE is granted for uplink transmission,

DL resources-PDSCH resources indicating the remaining information in the random access response for the UE to be transmitted.

Timing advance may also be referred to as timing calibration information, timing adjustment, timing correction, etc. The eNB may determine a timing of a random access preamble received at the eNB. The eNB may generate a timing advance to properly time align at the eNB for subsequent uplink transmissions from the UE.

UL and DL resources may be transmitted in various ways. In one design, the available resources for a given link may be divided into resource blocks, and the granted resources may be transmitted by a resource block index. In another design, the granted resources may be transmitted by the size and time-frequency location of the granted resources. An access grant may also convey modulation and coding for granted resources. Alternatively, the modulation and coding may be fixed/predetermined or may be announced on a broadcast channel. In general, the PDCCH may convey any information used by the UE to transmit on UL resources and any information used by the UE to receive transmissions sent to the UE on the PDSCH.

The I-RNTI may be explicitly sent in a designated field. Optionally, the I-RNTI may be sent implicitly and embedded within other information, which may reduce the amount of information sent on the PDCCH. For example, a Cyclic Redundancy Check (CRC) may be generated based on all information sent on the PDCCH (except for the I-RNTI). The CRC may be exclusive OR (XOR) with the I-RNTI, and the exclusive OR CRC may be sent on the PDCCH. The receiving UE will be able to recover the CRC by applying the corrected I-RNTI, while the other UEs will generate an erroneous CRC due to applying the erroneous I-RNTI.

In one design, the PDSCH may carry messages that include:

C-RNTI-the eNB includes the C-RNTI if the UE is allocated,

CQI resource-indicating the UL resource the UE is granted for transmitting CQI,

PC resource-indicating DL resource for sending PC corrections to the UE, and

PC correction-indicates an adjustment to the transmit power of the UE.

The C-RNTI may be used to identify the UE for the communication session. The UE may also be identified using a MAC ID or some other type of ID instead of the C-RNTI. The C-RNTI may be sent on the PDSCH as part of the random access response, if available, or may be sent at any time within the lifetime of the I-RNTI. The I-RNTI may be used to identify the UE until a C-RNTI is allocated. The CQI and PC resources may be transmitted in various ways. In one design, the CQI or PC resources may be transmitted via a resource block index, a size and time-frequency location of the granted resources, a frequency of the granted resources, and/or the like. In one design, the PC correction may be: (i) an increase command for increasing the transmission power of the UE by a predetermined step size; or (ii) a down command for reducing the transmit power of the UE down by a predetermined step size. In another design, the PC correction may indicate an amount of increase or decrease in transmit power.

Messages sent on PDCCH and PDSCH may also carry different and/or other information. The eNB may transmit the PDCCH in a broadcast manner, for example, by using a sufficiently low code rate and modulation order and a sufficiently high transmit power, so that all UEs within the coverage of the eNB can reliably receive the PDCCH. The eNB may send messages for the UE on the PDSCH in a broadcast manner. Alternatively, the eNB may transmit the message using a Modulation and Coding Scheme (MCS) selected based on the CQI in the random access preamble received from the UE. This may result in more efficient use of the available resources for PDSCH.

The UE may receive and decode messages sent to the UE on the PDCCH and PDSCH. After decoding the two messages, the UE has sufficient configuration resources and is able to exchange layer 3 signaling and/or data with the eNB (step a 4). The UE may use an on-off keying (OOK) to send an Acknowledgement (ACK) to the eNB to indicate successful reception of the message. For OOK, an ACK may be sent as a1 (or "on") and a Negative Acknowledgement (NAK) may be sent as a 0 (or "off"). If the eNB responds asynchronously to the random access preamble from the UE, the use of OOK will result in the UE transmitting on the uplink only for ACKs and not NAKs. After synchronization is achieved, the UE may send the ACK/NAK using other modulation techniques, e.g., 3-state modulation.

Multiple UEs may randomly select the same random ID and may also transmit the random access preamble in the same frame. When such a collision occurs, a mechanism may be implemented in the signaling exchange in step a4 to resolve the access contention.

The UE may operate in one of several states, such as LTE detached, LTE IDLE, and LTE active states, which may be associated with RRC _ NULL, RRC _ IDLE, and RRC _ CONNECTED states, respectively. Radio Resource Control (RRC) may perform various functions for establishing, maintaining, and terminating calls. In the LTE detached state, the UE has no access to the system and is unknown to the system. The UE may be powered on in the LTE-detached state and may operate in the RRC _ NULL state. The UE may transition to an LTE idle state or an LTE active state after accessing the system and performing registration. In the LTE idle state, the UE may have performed registration but may not have any data to exchange on the downlink or uplink. Thus, the UE may be IDLE and operate in an RRC _ IDLE state. In the LTE idle state, the UE and system may have relevant context information to allow the UE to quickly transition to the LTE active state. When there is data to send or receive, the UE may transition to an LTE active state. In the LTE active state, the UE may be in active communication with the system on the downlink and/or uplink and may operate in an RRC _ CONNECTED state.

Fig. 4 shows a message flow of a design of a random access procedure 400. The UE may access the system by transmitting a random access preamble, which may include a random ID, a downlink CQI, and an access type (step B1). The access type may indicate whether the UE accesses the system from an RRC _ NULL, RRC _ IDLE, or RRC _ CONNECTED state. The UE may be subject to an authentication procedure when accessing the system from an RRC _ NULL or RRC _ IDLE state, and thus may require a different resource allocation than accessing the system from an RRC _ CONNECTED state. The UE may communicate with the eNB in an RRC _ CONNECTED state and may access another eNB for handover. The random access preamble may also include different and/or additional information. The UE may determine the I-RNTI as described above with respect to fig. 3.

The eNB may receive a random access preamble from the UE and may respond by transmitting a random access response to the UE on the PDCCH and PDSCH (steps B2 and B3). The eNB may determine the I-RNTI for the UE based on the random access preamble. In one design, the PDCCH may carry a message that includes the I-RNTI and DL resources for the PDSCH used to transmit the remaining information to the UE. In one design, the PDSCH may carry messages including C-RNTI (if available), timing advance, UL resources, CQI resources, PC corrections, and/or the like. Messages sent on PDCCH and PDSCH may also carry different and/or additional information.

The eNB may transmit the PDCCH and PDSCH as described above for fig. 3. The UE may receive and decode messages sent to the UE on the PDCCH and PDSCH. After decoding the two messages, the UE has sufficient resource configuration and is able to exchange layer 3 signaling and/or data with the eNB (step B4).

Fig. 5 shows a message flow of a design of a random access procedure 500. The UE may access the system by transmitting a random access preamble, which may include a random ID and a downlink CQI (step C1). The random access preamble may also include different and/or additional information.

The eNB may receive a random access preamble from the UE and may respond by transmitting a random access response to the UE on the PDCCH and the PDSCH (steps C2 and C3). In one design, the PDCCH may carry a message that includes a RA preamble identifier, a timing advance, UL resources, DL resources, and validity fields for the received random access preamble. The validity field may support an asynchronous access response and may indicate a frame in which the random access response is available. In one design, the validity field may include two bits and may be set to 00 to indicate that the current response is for a random access preamble transmitted in the current frame, may be set to 01 to indicate that the current response is for a random access preamble transmitted in a previous frame, and so on. To save bits, the RA preamble identifier may mask a CRC generated based on all information transmitted on the PDCCH. In one design, the PDSCH may carry messages including C-RNTI (if available), CQI resources, PC corrections, and/or the like. Messages sent on PDCCH and PDSCH may also carry different and/or other information.

The eNB may transmit the PDCCH and PDSCH as described above for fig. 3. The UE may receive and decode messages sent to the UE on the PDCCH and PDSCH. After decoding the two messages, the UE has sufficient resource configuration and is able to exchange layer 3 signaling and/or data with the eNB (step C4).

In general, the random access preamble and the random access response may include any parameters that may have any size. In one design, the random access preamble and the random access response may include the parameters given below:

the random access preamble may include the following:

random ID-4 bits

Downlink CQI-2 bits

The random access response may include the following:

C-RNTI-16 bits

Timing advance-8 bits

CQI resources and PC resources-16 bits

UL RESOURCE-7 bits for resource Block ID and 5 bits for MCS

CRC-16 bits (possibly masked by I-RNTI or RA preamble identifier)

In the design given above, a total of 68 bits may be sent for the random access response. A 68-bit message may be too large to be efficiently sent on the PDCCH. By splitting the information in the random access response into two parts and transmitting them on the PDCCH and PDSCH, improved efficiency may be achieved. In one design, the two part messages may be as follows:

the message of part I sent on PDCCH may include the following:

timing advance-8 bits

DL resource-7 bits for resource block ID

UL resource-7 bits for resource block ID

Significance-2 bits

CRC-16 bits masked by RA preamble identifier

The part II message sent on PDSCH may include the following:

C-RNTI-16 bits

CQI resource-16 bits

PC resource-16 bits

In the design given above, the DL and UL resources may be transmitted by resource block ID or index. A predetermined modulation scheme (e.g., QPSK) and/or a predetermined coding scheme (e.g., code rate 1/3) may be used for UL resources. Alternatively, the modulation and coding for the UL resources may be transmitted on the PDCCH or PDSCH. Similarly, a predetermined modulation scheme (e.g., QPSK) and/or a predetermined coding scheme (e.g., code rate 1/3) may be used for DL resources. Alternatively, the modulation and coding for the DL resources may be transmitted on the PDCCH. For UL and DL resources, the code rate may depend on the number of allocated resource blocks.

In the design given above, a 40-bit message may be sent on the PDCCH, which is the standard message size for PDCCH. In general, the message sent on the PDCCH for part I may be specified such that it may be sent like other messages on the PDCCH. The remaining information of the random access response may be transmitted on the PDSCH.

The specific design of various parameters that may be transmitted for the random access preamble and the random access response is described above. In general, the random access preamble and the random access response may each comprise any set of parameters, which may have any suitable size.

Fig. 6 shows a message flow of a design of a random access procedure 600. In this design, multiple RACHs may be available, and the UE may randomly select one of the available RACHs to use. Each RACH may be associated with a different random access RNTI (RA-RNTI). The available RACH and/or its RA-RNTI may be sent or otherwise communicated in a broadcast channel. The UE may access the system by transmitting a random access preamble on the selected RACH (step D1). The random access preamble may include a random ID, a downlink CQI, an access type, some other information, or any combination thereof. During system access, the UE may be identified by a combination of the RA preamble identifier and the RA-RNTI of the selected RACH. In fact, the I-RNTI may be defined based on the RA preamble identifier and the RA-RNTI (instead of the system time).

The eNB may receive a random access preamble from the UE and may respond by transmitting a random access response to the UE on the PDCCH and the PDSCH (steps D2 and D3). In one design, the PDCCH may carry messages including RA-RNTI and DL resources for the PDSCH. In one design, the PDSCH may carry messages including RA preamble identifiers, C-RNTI (if available), timing advance, UL resources, CQI resources, PC corrections, and/or the like. Messages sent on PDCCH and PDSCH may also carry different and/or other information. The eNB may transmit the PDCCH and PDSCH as described above for fig. 3.

The UE may receive and decode messages sent on the PDCCH. The UE may know that a message may be transmitted to the UE on the PDSCH based on the RA-RNTI included in the message transmitted on the PDCCH. The UE may then receive and decode the message transmitted on the PDSCH. The UE may learn that the message is likely addressed to the UE based on the RA preamble identifier included in the message. After decoding the two messages, the UE has sufficient resource configuration and is able to exchange layer 3 signaling and/or data with the eNB (step D4).

Fig. 7 shows a message flow of a design of a random access procedure 700. In this design, the UE may be in an RRC _ NULL or RRC _ IDLE state and may access the system by sending a random access preamble (step E1). The random access preamble may include a random ID and possibly one or more additional bits for downlink CQI and/or other information. The UE may determine the I-RNTI as described above with respect to fig. 3.

The eNB may receive a random access preamble from the UE and may respond by transmitting a random access response to the UE on the PDCCH and/or PDSCH (step E2). The random access response may include a timing advance, UL resources, and CRC. The CRC may be XOR'd with the I-RNTI (as shown in FIG. 7), the RA preamble identifier, the RA-RNTI, and/or other information to identify the UE being addressed. In step E2, different and/or other information may be transmitted on the PDCCH/PDSCH.

The UE may then respond with a unique UE ID to resolve the possible conflict (step E3). The unique UEID may be an International Mobile Subscriber Identity (IMSI), a Temporary Mobile Subscriber Identity (TMSI), an International Mobile Equipment Identity (IMEI), an Electronic Serial Number (ESN), a Mobile Equipment Identity (MEID), an IP address, and the like. The unique UE ID may also be a registration area ID if the UE is already registered in a given area. The UE may also transmit downlink CQI, pilot measurement reports, etc. along with a unique UE ID.

The eNB may receive a unique "handle" or pointer to a unique UE ID. The eNB may then allocate the C-RNTI and control channel resources to the UE. The eNB may transmit a response on the PDCCH and the PDSCH (steps E4 and E5). In one design, the PDCCH may carry messages including the I-RNTI and DL resources for the PDSCH. In one design, the PDSCH may carry messages that include unique UE IDs, C-RNTIs (if available), CQI resources, PC corrections, and/or the like. Messages sent on PDCCH and PDSCH may also carry different and/or other information.

The UE may receive and decode messages sent to the UE on the PDCCH and PDSCH. After decoding the two messages, the UE has sufficient resource configuration and is able to exchange layer 3 signaling with the eNB (steps E6 and E7). Layer 3 signaling may include non-access stratum (NAS) messages for UE authentication, radio link configuration between the UE and the eNB, connection management, etc. After the layer 3 signaling exchange is completed, the UE and the eNB may exchange data (step E8).

The system may support Hybrid Automatic Retransmission (HARQ) in order to improve the reliability of data transmission. For HARQ, the transmitter may send a message transmission and, if necessary, one or more retransmissions until the receiver decodes the message correctly, or a maximum number of retransmissions has been sent, or some other termination condition is met. A message may also be referred to as a packet, a data frame, a data unit, a data block, etc. Each transmission and each retransmission of a message may also be referred to as a HARQ transmission.

As shown in fig. 7, HARQ may be used for the message transmitted in step E3 and subsequent steps. The transmitter may send a HARQ transmission for a message and the receiver may send an ACK if the message is decoded correctly or a NAK if the message is decoded in error. For HARQ transmissions sent on the allocated DL resources, an ACK or NAK may be sent on the UL control resource associated with the allocated DL resource. Similarly, for HARQ transmissions sent on the allocated UL resources, an ACK or NAK may be sent on the DL control resource associated with the allocated UL resource. Thus, the location of the ACK/NAK may be implicit and known a priori based on the allocated DL or UL resources.

Fig. 8 shows a message flow of a design of a random access procedure 800. In this design, the UE may be in an RRC _ IDLE or RRC _ CONNECTED state and may already have a C-RNTI assigned to the UE. The UE may access the system from an RRC _ IDLE state in response to receiving data to be transmitted or from an RRC _ CONNECTED state according to a handover command. The UE may transmit a random access preamble, which may include a random ID and possibly one or more additional bits for downlink CQI and/or other information (step F1).

The eNB may receive a random access preamble from the UE and may respond by transmitting a random access response to the UE on the PDCCH and/or PDSCH (step F2). The random access response may include a timing advance, UL resources, and a CRC, which may be XOR'd with the I-RNTI (as shown in FIG. 8), the RA preamble identifier, the RA-RNTI, and/or other information used to identify the UE. In step F2, different and/or other information may also be transmitted on the PDCCH/PDSCH.

The UE may then send its C-RNTI, downlink CQI, pilot measurement reports, and/or other information to the eNB (step F3). The eNB does not need to allocate the C-RNTI, but may allocate control channel resources to the UE. Subsequently, the eNB may transmit a response on the PDCCH and the PDSCH (steps F4 and F5). In one design, the PDCCH may carry messages including the C-RNTI and DL resources for the PDSCH. In one design, the PDSCH may carry messages including CQI resources, PC corrections, and/or the like. Messages sent on PDCCH and PDSCH may also carry different and/or other information.

The UE may receive and decode messages sent to the UE on the PDCCH and PDSCH. After decoding the two messages, the UE has sufficient resource configuration and is able to exchange data with the eNB (step F6). Since the UE has been authenticated before being assigned the C-RNTI, the layer 3 signaling exchange may be omitted and the UE and eNB may exchange data immediately.

Figure 8 may also be used when the UE does not have an allocated C-RNTI. In this case, instead of the C-RNTI, a registration area ID or some other identification information may be sent.

Fig. 9 shows a message flow of a design of a random access procedure 900 for handover. In this design, the UE may communicate with the source eNB and may handover to the target eNB. The source eNB may assign a random ID to the UE for accessing the target eNB. To avoid collisions, a subset of all possible random IDs may be reserved for handover, and the random ID assigned to the UE may be selected from the reserved subset. Information about the reserved subset of random IDs (or the remaining random IDs that may be used for normal system access) may be broadcast to all UEs or otherwise made known to the UEs.

The source eNB may inform the target eNB of the C-RNTI, random ID, CQI resources, PC resources, and/or other information for the UE. Collision resolution may not be necessary due to the one-to-one mapping between the assigned random ID and the C-RNTI of the UE. Thus, prior to the random access procedure, the target eNB may have UE related information. For simplicity, fig. 9 illustrates a random access procedure between a UE and a target eNB.

The UE may transmit a random access preamble, which may include a random ID assigned to the UE and possibly other information (step G1). The target eNB may receive the random access preamble and may respond by transmitting a random access response to the UE on the PDCCH and/or PDSCH (step G2). The random access response may include a timing advance, UL resources, and a CRC that may be XOR'd with the C-RNTI of the UE. In step G2, different and/or other information may also be transmitted on the PDCCH/PDSCH.

After receiving the transmitted information in step G2, the UE has sufficient resource configuration and is able to exchange data with the eNB. The UE may send a layer 2ACK for the information received in step G2, and may also send data and/or other information (step G3). Then, the eNB may transmit data to the UE on the PDSCH (step G5) and may transmit signaling for the PDSCH on the PDCCH (step G4).

The random access procedure in fig. 9 may also be used for initial system access. For example, the UE may operate in an RRC IDLE state and may receive a page from the system, e.g., for an incoming call or for downlink data available to the UE. The page may include an assigned random ID, which may be selected from a reserved subset.

Fig. 3 through 9 illustrate various random access procedures that may be used for initial system access (e.g., from an RRC _ NULL state), system access while IDLE (e.g., from an RRC _ IDLE state), and system access for handover (e.g., from an RRC _ CONNECTED state). For these random access procedures, the UE may transmit a random access preamble and the eNB may respond with a random access response, where the response may allocate various types of resources and/or provide various types of information. In general, the eNB may allocate any resources, such as C-RNTI, UL resources, CQI resources, PC resources, etc., that may allow the UE to transmit quickly on the uplink. The eNB may also send control information, such as timing advance, PC correction, etc., to control uplink transmissions from the UE.

Fig. 10 shows a design of a process 1000 used by a UE for system access. The UE may transmit a random access preamble for system access (block 1012). The random access preamble may include or may be determined based on a random ID, a downlink CQI, an access type, and the like, or any combination thereof. An access sequence may be selected for the random access preamble in the pool of available access sequences. The selected access sequence may be sent to convey the random access preamble.

The UE may receive a random access response including control channel resources allocated to the UE (block 1014). The control channel resources may include CQI resources used by the UE to send CQI on the uplink, PC resources used to send PC corrections on the downlink to the UE, and so on. The UE may also receive control information (e.g., timing advance and/or PC correction), UL resources, C-RNTI, etc. from the random access response (block 1016). The UE may receive a first message of a random access response on a control channel (e.g., PDCCH) of a shared data channel (e.g., PDSCH) and may receive a second message of the random access response on the shared data channel. The first message may include identification information of the random access preamble, DL resources of the shared data channel, and the like. The second message may include the allocated control channel resources, control information, UL resources, C-RNTI, and the like. The random access response may also be sent in other ways. The UE may exchange control information using the allocated control channel resources (block 1018). The UE may also transmit data using the allocated uplink resources (block 1020).

Fig. 11 shows a design of an apparatus 1100 for a UE. The apparatus 1100 includes means for transmitting a random access preamble for system access (module 1112), means for receiving a random access response including control channel resources allocated to the UE (module 1114), means for receiving control information, UL resources, C-RNTI, and the like from the random access response (module 1116), means for exchanging control information using the allocated control channel resources (module 1118), and means for transmitting data using the allocated uplink resources (module 1120).

Fig. 12 shows a design of a process 1200 performed by a base station, e.g., an eNB, to support system access. The base station may receive a random access preamble transmitted by the UE for system access (block 1212). The base station may transmit a random access response including control channel resources (e.g., CQI resources, PC resources, etc.) allocated to the UE (block 1214). The base station may also send control information (e.g., timing advance and/or PC correction), UL resources, C-RNTI, etc. in the random access response. The base station may exchange control information with the UE using the allocated control channel resources (block 1218). The base station may also receive data from the UE via the allocated uplink resources (block 1220).

Fig. 13 shows a design of an apparatus 1300 for a base station. The apparatus 1300 includes means for receiving a random access preamble transmitted by a UE for system access (module 1312), means for transmitting a random access response including control channel resources allocated to the UE (module 1314), means for transmitting control information, UL resources, C-RNTI, and the like in the random access response (module 1316), means for exchanging control information with the UE using the allocated control channel resources (module 1318), and means for receiving data from the UE via the allocated uplink resources (module 1320).

Fig. 14 shows a design of a process 1400 used by a UE for system access. The UE may transmit a random access preamble for system access, where the random access preamble includes identification information (block 1412). The UE may receive a random access response from the base station, where the random access response is asynchronous with respect to the random access preamble and addresses the random access preamble based on the identification information (block 1414). The identification information may include a random ID and/or some other information. The random access response may include a temporary ID (e.g., I-RNTI), an RA preamble identifier, a C-RNTI, and/or some other ID associated with or derived from the identification information. The UE may receive the random access response within a predetermined time window from transmitting the random access preamble.

The UE may select a random ID to use as the identification information. The UE may also be assigned a random ID, directly or indirectly, where the random ID is selected from a reserved pool of random IDs. For example, the UE may be assigned a random access preamble or an access sequence determined based on the selected random ID and additional information such as CQI. The UE may determine the random access preamble based on the random ID and additional information, such as downlink CQI, access type, etc. The UE may receive a temporary ID (e.g., an I-RNTI) formed based on the random ID, an RA preamble identifier determined based on the random ID, a C-RNTI assigned to the UE and associated with the random ID, and/or some other ID in a random access response.

For the design shown in fig. 6, the UE may transmit a random access preamble on a random access channel selected from among a plurality of available random access channels. The UE may receive a first message of a random access response on a control channel of a shared data channel, wherein the first message includes the RA-RNTI of the selected random access channel. The UE may receive a second message of a random access response on the shared data channel, wherein the second message includes a random access preamble identifier.

Fig. 15 shows a design of an apparatus 1500 for a UE. The apparatus 1500 includes means for transmitting a random access preamble for system access, wherein the random access preamble includes identification information (block 1512), and means for receiving a random access response from a base station, wherein the random access response is asynchronous with respect to the random access preamble and the random access preamble is addressed based on the identification information (block 1514).

Fig. 16 shows a design of a process 1600 performed by a base station to support system access. The base station may receive a random access preamble transmitted by the UE for system access, where the random access preamble includes identification information (block 1612). The base station may transmit a random access response to the UE, where the random access response is asynchronous with respect to the random access preamble and addresses the random access preamble based on the identification information (block 1614). The identification information may include a random ID and/or some other information. The random access response may include a temporary ID (e.g., I-RNTI), an RA preamble identifier, a C-RNTI, and/or some other ID associated with or derived from the identification information.

Fig. 17 shows a design of an apparatus 1700 for a base station. The apparatus 1700 includes means for receiving a random access preamble transmitted by a UE for system access, wherein the random access preamble includes identification information (module 1712), and means for transmitting a random access response to the UE, wherein the random access response is asynchronous with respect to the random access preamble and is addressed based on the identification information (module 1714).

Fig. 18 shows a design of a process 1800 performed by a UE for system access during handover. The UE may communicate with a first/source base station (block 1812). The UE may receive, directly or indirectly, a random ID for handover of the UE from the first base station to the second/target base station (block 1814). The UE may receive a random ID from the first base station, wherein the random ID is selected from a reserved pool of random IDs. The UE may also be assigned a random access preamble/access sequence that includes a random ID selected by the first base station and additional information, such as CQI. The UE may transmit a random access preamble including a random ID to access the second base station, where the random ID is used to identify the UE (block 1816). The UE may receive a random access response including UL resources, timing advance, etc. (block 1818). The UE may determine that the random access response is for the UE based on the CRC masked with the C-RNTI assigned to the UE. After receiving the random access response, the UE may exchange data with the second base station (block 1820).

Fig. 19 shows a design of an apparatus 1900 for a UE. The apparatus 1900 includes means for communicating with a first/source base station (module 1912), means for receiving a random ID for handover of a UE from the first base station to a second/target base station (module 1914), means for transmitting a random access preamble including the random ID to access the second base station (module 1916), wherein the random ID is used to identify the UE, means for receiving a random access response including UL resources, timing advance, etc. (module 1918), means for determining that the random access response is intended for the UE based on CRC masked with C-RNTI assigned to the UE, and means for exchanging data with the second base station after receiving the random access response (module 1920).

Fig. 20 shows a design of a process 2000 performed by a target base station to support system access during handover. The target base station may receive a random ID assigned to the UE from the source base station for handover from the source base station to the target base station (block 2012). The target base station may also receive other information for the UE from the source base station, such as C-RNTI, CQI resources, PC resources, and the like. The target base station may receive a random access preamble including a random ID from the UE (block 2014). The target base station may identify that the random access preamble is from the UE based on the random ID (block 2016). The target base station may send a random access response to the UE including UL resources, timing advance, CRC masked with C-RNTI, etc. (block 2018). After sending the random access response, the target base station may exchange data with the UE (block 2020).

Fig. 21 shows a design of an apparatus 2100 for a target base station. Apparatus 2100 includes means for receiving a random ID assigned to a UE from a source base station for handover from the source base station to a target base station (module 2112), means for receiving a random access preamble from the UE including the random ID (module 2114), means for identifying, based on the random ID, that the random access preamble is from the UE (module 2116), means for transmitting a random access response to the UE including UL resources, timing advance, CRC masked with C-RNTI, and the like (module 2118), and means for exchanging data with the UE after transmitting the random access response (module 2120).

Fig. 22 shows a design of a process 2200 for system access by a UE. The UE may send a random access preamble to access the base station (block 2212). The UE may receive a random access response from the base station (block 2214). The random access response may include timing advance, UL resources, etc. The UE may send a first message to the base station including a unique ID of the UE (block 2216). The unique ID may be an IMSI, TMSI, C-RNTI, a registration area ID, or some other ID assigned to the UE. The UE may receive a second message from the base station addressed to the UE based on the unique ID (block 2218). The second message may include CQI resources, PC resources, and the like. After transmitting the second message, the UE may exchange signaling and/or data with the base station (block 2220).

The UE may operate in an idle state prior to transmitting the random access preamble, and may transmit the random access preamble to transition from the idle state to an active state. As shown in fig. 8, the UE may exchange layer 3 signaling with the base station after receiving the second message, and may exchange data with the base station after completing the layer 3 signaling exchange.

The UE may transmit a random access preamble to perform handover to the base station. The UE may send its C-RNTI in a first message and may receive control channel resources from a second message. Then, as shown in fig. 9, the UE may exchange data with the base station after receiving the second message.

The random access preamble and the random access response may be transmitted without using HARQ. As shown in fig. 8 and 9, the first and second messages may be transmitted using HARQ.

Fig. 23 shows a design of an apparatus 2300 for a UE. Apparatus 2300 includes means for transmitting a random access preamble to access a base station (module 2312), means for receiving a random access response from the base station (module 2314), means for transmitting a first message to the base station including a unique ID of a UE (module 2316), means for receiving a second message from the base station addressed to the UE based on the unique ID (module 2318), and means for exchanging signaling and/or data with the base station after transmitting the second message (module 2320).

Fig. 24 shows a design of a process 2400 performed by a base station to support system access. The base station may receive a random access preamble transmitted by the UE to access the base station (block 2412). The base station may send a random access response to the UE (block 2414). The base station may receive a first message including a unique ID of the UE (block 2416). The base station may send a second message addressed to the UE based on the unique ID (block 2418). After sending the second message, the base station may exchange signaling and/or data with the UE (block 2420).

Fig. 25 shows a design of an apparatus 2500 for a base station. Apparatus 2500 includes means for receiving a random access preamble transmitted by a UE to access a base station (module 2512), means for transmitting a random access response to the UE (module 2514), means for receiving a first message including a unique ID of the UE (module 2516), means for transmitting a second message addressed to the UE based on the unique ID (module 2518), and means for exchanging signaling and/or data with the UE after transmitting the second message (module 2520).

The modules in fig. 11, 13, 15, 17, 19, 21, 23, and 25 may comprise processors, electronics devices, hardware devices, electronics components, logic circuits, memories, etc., or any combination thereof.

Those of skill in the art would understand that information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the disclosure herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.

The various illustrative logical blocks, modules, and circuits described herein in connection with the disclosure may be implemented or performed with the following components: a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a processor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

The steps of a method or algorithm described in connection with the disclosure herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In the alternative, the processor and the storage medium may reside as discrete components in a user terminal.

In one or more exemplary designs, the functions may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to carry or store desired program code means in the form of instructions or data structures and which can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Further, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Magnetic and optical disks, as used herein, include: compact Disc (CD), laser disc, optical disc, Digital Versatile Disc (DVD), floppy disc and blu-ray disc where discs usually reproduce data magnetically, while optical discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (13)

1. An apparatus for wireless communication, comprising:

at least one processor configured to:

transmitting a random access preamble for system access by a User Equipment (UE),

receiving a random access response comprising uplink resources allocated to the UE, a timing advance for the UE, and a Random Access (RA) preamble identifier for the random access preamble transmitted by the UE,

adjusting the transmission timing of the UE based on the timing advance, an

Transmitting an uplink transmission using the allocated uplink resources transmitted in the random access response and based on the adjusted transmission timing of the UE,

wherein the at least one processor is further configured to:

receiving a first message of the random access response on a control channel for a shared data channel, and receiving a second message of the random access response on the shared data channel, the first message including identification information of the random access preamble or a random access channel used to transmit the random access preamble, and the second message including the uplink resources allocated to the UE; and

a memory coupled to the at least one processor.

2. The apparatus of claim 1, wherein the random access response comprises at least one of: the UE may include Channel Quality Indicator (CQI) resources to send CQI on an uplink and Power Control (PC) resources to send PC corrections on a downlink to the UE.

3. The apparatus of claim 1, wherein the at least one processor is configured to determine the random access preamble based on at least one of a random Identifier (ID), a Channel Quality Indicator (CQI), and an access type.

4. The apparatus of claim 1, wherein the at least one processor is configured to receive control information in the random access response, the control information comprising a Power Control (PC) correction.

5. The apparatus of claim 1, in which the at least one processor is configured to receive a cell radio network temporary identifier (C-RNTI) in the random access response.

6. The apparatus of claim 1, wherein the at least one processor is configured to receive uplink resources allocated to the UE in the random access response, and to transmit data using the allocated uplink resources.

7. The apparatus of claim 1, wherein the at least one processor is configured to select an access sequence for the random access preamble from a pool of available access sequences, and to transmit the selected access sequence to transmit the random access preamble.

8. A method for wireless communication, comprising:

transmitting a random access preamble for system access by a User Equipment (UE);

receiving a random access response comprising uplink resources allocated to the UE, a timing advance for the UE, and a Random Access (RA) preamble identifier for the random access preamble transmitted by the UE;

adjusting a transmit timing of the UE based on the timing advance; and

transmitting an uplink transmission using the allocated uplink resources transmitted in the random access response and based on the adjusted transmission timing of the UE,

wherein the receiving of the random access response comprises receiving a first message of the random access response on a control channel for a shared data channel, the first message comprising identification information of the random access preamble or a random access channel used for transmitting the random access preamble; and receiving a second message of the random access response on the shared data channel, the second message including the uplink resources allocated to the UE.

9. The method of claim 8, wherein the first and second light sources are selected from the group consisting of,

wherein the random access response includes at least one of Channel Quality Indicator (CQI) resources and Power Control (PC) resources, the CQI resources being used by the UE to transmit CQI on an uplink and the PC resources being used to transmit PC corrections to the UE on a downlink.

10. An apparatus for wireless communication, comprising:

means for transmitting a random access preamble for system access by a User Equipment (UE);

means for receiving a random access response comprising uplink resources allocated to the UE, a timing advance for the UE, and a Random Access (RA) preamble identifier for the random access preamble transmitted by the UE;

means for adjusting a transmit timing of the UE based on the timing advance; and

means for transmitting an uplink transmission using the allocated uplink resources transmitted in the random access response and based on the adjusted transmit timing of the UE,

wherein the means for receiving the random access response comprises: means for receiving a first message of the random access response on a control channel for a shared data channel, the first message including identification information of the random access preamble or a random access channel used to transmit the random access preamble; and means for receiving a second message of the random access response on the shared data channel, the second message including the uplink resources allocated to the UE.

11. The apparatus of claim 10, wherein the first and second electrodes are disposed on opposite sides of the substrate,

wherein the random access response includes at least one of Channel Quality Indicator (CQI) resources and Power Control (PC) resources, the CQI resources being used by the UE to transmit CQI on an uplink and the PC resources being used to transmit PC corrections to the UE on a downlink.

12. An apparatus for wireless communication, comprising:

at least one processor configured to:

receiving a random access preamble transmitted by a User Equipment (UE) for system access,

transmitting a random access response including uplink resources allocated to the UE, a timing advance for the UE, and a Random Access (RA) preamble identifier for the random access preamble transmitted by the UE,

receive an uplink transmission sent by the UE using the allocated uplink resources transmitted in the random access response and based on the UE's transmit timing adjusted by the timing advance,

wherein the at least one processor is further configured to:

transmitting a first message of the random access response on a control channel for a shared data channel, and transmitting a second message of the random access response on the shared data channel, the first message including identification information of the random access preamble or a random access channel used to transmit the random access preamble, and the second message including the uplink resources allocated to the UE; and

a memory coupled to the at least one processor.

13. The apparatus of claim 12, wherein the random access response comprises at least one of: the UE may include Channel Quality Indicator (CQI) resources to send CQI on an uplink and Power Control (PC) resources to send PC corrections on a downlink to the UE.