WO2010056060A2 - Procédé et appareil pour la transmission de signaux ack/nack harq dans un système à antennes multiples - Google Patents

Procédé et appareil pour la transmission de signaux ack/nack harq dans un système à antennes multiples Download PDF

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WO2010056060A2
WO2010056060A2 PCT/KR2009/006681 KR2009006681W WO2010056060A2 WO 2010056060 A2 WO2010056060 A2 WO 2010056060A2 KR 2009006681 W KR2009006681 W KR 2009006681W WO 2010056060 A2 WO2010056060 A2 WO 2010056060A2
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ack
nack
nack signal
resource
transmission symbol
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PCT/KR2009/006681
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English (en)
Korean (ko)
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WO2010056060A3 (fr
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한승희
곽진삼
고현수
정재훈
이문일
권영현
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엘지전자주식회사
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Publication of WO2010056060A3 publication Critical patent/WO2010056060A3/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1854—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1861—Physical mapping arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals

Definitions

  • the present invention relates to wireless communication, and more particularly, to a method and apparatus for performing a hybrid automatic repeat request (HARQ) in a wireless communication system.
  • HARQ hybrid automatic repeat request
  • LTE Long term evolution
  • 3GPP 3rd Generation Partnership Project
  • TS Technical Specification
  • Spectrum aggregation includes, for example, 3GPP LTE, which supports bandwidths of up to 20 MHz, but uses multiple carriers to support 100 MHz of system bandwidth, and a technique for allocating asymmetric bandwidth between uplink and downlink. .
  • Dynamic scheduling is mainly used for transmitting and receiving downlink data and uplink data.
  • the base station In order to transmit the downlink data, the base station first informs the user equipment of downlink resource allocation (called a downlink grant). The terminal receives the downlink data through the downlink resource indicated by the downlink resource allocation.
  • the terminal In order to transmit the uplink data, the terminal first transmits an uplink resource allocation request (also called a scheduling request) to the base station.
  • the base station receiving the uplink resource allocation request informs the terminal of uplink resource allocation (called an uplink grant).
  • the terminal transmits the uplink data through the uplink resource indicated by the uplink resource allocation.
  • Hybrid Automatic Repeat Request is a technique for improving transmission efficiency by combining error correction and retransmission.
  • HARQ can be divided into synchronous HARQ and asynchronous HARQ.
  • the transmitter and the receiver can know the retransmission time in advance, and in the asynchronous HARQ, the receiver cannot know the retransmission time of the transmitter in advance.
  • HARQ it is HARQ positive-acknowledgement (ACK) / negative-acknowledgement (NACK) signal that the receiver informs the transmitter whether or not the data is successfully received.
  • ACK positive-acknowledgement
  • NACK negative-acknowledgement
  • An object of the present invention is to provide a method and apparatus for transmitting a HARQ ACK / NACK signal using a plurality of resources and a plurality of antennas in a multi-carrier system.
  • a method of transmitting a hybrid automatic repeat request (HARQ) ACK / NACK signal in a multi-carrier system includes receiving a first transport block on a first carrier, receiving a second transport block on a second carrier, and receiving a first ACK / NACK signal and the first ACK / NACK signal for the first transport block.
  • HARQ hybrid automatic repeat request
  • the first transmission symbol of the ACK / NACK signal is transmitted to the first antenna using the first ACK / NACK resource, and the first transmission symbol of the second ACK / NACK signal using the second ACK / NACK resource And transmitting to the second antenna.
  • the method transmits a second transmission symbol of the first ACK / NACK signal to the second antenna using the second ACK / NACK resource, and transmits a second transmission symbol of the second ACK / NACK signal to the second antenna.
  • the method may further include transmitting to the second antenna using 1 ACK / NACK resource.
  • the second transmission symbol of the first ACK / NACK signal is a complex conjugate of the first transmission symbol of the first ACK / NACK signal
  • the second transmission symbol of the second ACK / NACK signal is the second ACK / NACK signal. It may be a negative complex conjugate of the first transmission symbol of.
  • the second transmission symbol of the first ACK / NACK signal is a negative complex conjugate of the first transmission symbol of the first ACK / NACK signal
  • the second transmission symbol of the second ACK / NACK signal is the second ACK / NACK signal. It may be a complex conjugate of the first transmission symbol of the NACK signal.
  • the first ACK / NACK resource may be determined based on resources of a control channel used for resource allocation of the first transport block.
  • the second ACK / NACK resource may be determined based on the first ACK / NACK resource.
  • the first and second ACK / NACK resources may include at least one of an orthogonal sequence index, a cyclic shift index, and a resource block index.
  • a receiver performing HARQ may include a first ACK / NACK signal for a first transport block received on a first carrier and a second ACK / NACK signal for a second transport block received on a second carrier.
  • An ACK / NACK generating unit for determining a first transmission signal, and a first transmission symbol of the first ACK / NACK signal is transmitted to a first antenna using a first ACK / NACK resource, and a first transmission of the second ACK / NACK signal is performed.
  • a spatial processor configured to process the symbol to be transmitted to the second antenna using the second ACK / NACK resource.
  • the spatial processing unit transmits a second transmission symbol of the first ACK / NACK signal to the second antenna using the second ACK / NACK resource, and the second transmission symbol of the second ACK / NACK signal is the second transmission symbol. 1 may be transmitted to the second antenna using the ACK / NACK resources.
  • a method of transmitting a hybrid automatic repeat request (HARQ) ACK / NACK signal in a multi-carrier system includes receiving a first transport block on a first carrier, receiving a second transport block on a second carrier, determining a first ACK / NACK resource and a second ACK / NACK resource, and transmitting the first transmission block. Transmitting a first transmission symbol of an ACK / NACK signal for the block and the second transport block to a first antenna using the first ACK / NACK resource, and transmitting the second transmission symbol of the ACK / NACK signal to the first antenna Transmitting to the second antenna using 2 ACK / NACK resources.
  • HARQ hybrid automatic repeat request
  • a HARQ ACK / NACK signal for data received through a plurality of carriers may be transmitted while maintaining a low Peak-to-Average Power Ratio (PAPR) / Cubic Metric (CM) characteristic.
  • PAPR Peak-to-Average Power Ratio
  • CM Cubic Metric
  • FIG. 1 is a block diagram illustrating a wireless communication system.
  • FIG. 2 shows a structure of a radio frame in 3GPP LTE.
  • 3 is an exemplary diagram illustrating a resource grid for one slot in 3GPP LTE.
  • 5 is a flowchart showing the configuration of a PDCCH.
  • 6 is an exemplary diagram illustrating transmission of uplink data.
  • FIG. 7 is an exemplary diagram illustrating reception of downlink data.
  • FIG. 11 shows PUCCH format 1 in an extended CP in 3GPP LTE.
  • FIG. 12 shows an example of a transmitter in which one MAC operates multiple carriers.
  • FIG. 13 shows an example of a receiver in which one MAC operates multiple carriers.
  • FIG. 14 shows an example of a transmitter in which multiple MACs operate multiple carriers.
  • 15 shows an example of a receiver in which multiple MACs operate multiple carriers.
  • 16 shows another example of a transmitter in which multiple MACs operate multiple carriers.
  • FIG. 17 shows another example of a receiver in which multiple MACs operate multiple carriers.
  • 21 is a block diagram of a wireless device having multiple antennas, in which an embodiment of the present invention is implemented.
  • 22 is an exemplary diagram illustrating an example of spatial processing.
  • 25 shows ACK / NACK transmission according to an embodiment of the present invention.
  • 26 shows an example of application to a plurality of carriers.
  • FIG. 27 shows an HARQ system in which an embodiment of the present invention is implemented.
  • FIG. 28 is a block diagram illustrating a terminal in which an embodiment of the present invention is implemented.
  • 29 is a block diagram illustrating a signal processing apparatus that performs SC-FDMA.
  • 31 shows another example of subcarrier mapping.
  • 32 is a block diagram illustrating a signal processing apparatus for performing clustered SC-FDMA.
  • 33 is a block diagram illustrating another example of a signal processing apparatus that supports multiple carriers.
  • 34 is a block diagram illustrating another example of a signal processing apparatus that supports multiple carriers.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • the wireless communication system 10 includes at least one base station (BS) 11. Each base station 11 provides a communication service for a particular geographic area (generally called a cell) 15a, 15b, 15c. The cell may be divided into a plurality of regions (called sectors), and in some cases, the sector itself may mean a cell.
  • the user equipment (UE) 12 may be fixed or mobile, and may include a mobile station (MS), a user terminal (UT), a subscriber station (SS), a wireless device, a personal digital assistant (PDA), It may be called other terms such as a wireless modem and a handheld device.
  • the base station 11 generally refers to a fixed station communicating with the terminal 12, and may be referred to as other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, and the like. have.
  • eNB evolved-NodeB
  • BTS base transceiver system
  • access point and the like. have.
  • the wireless communication system may support uplink and / or downlink Hybrid Automatic Repeat Request (HARQ).
  • HARQ Hybrid Automatic Repeat Request
  • CQI channel quality indicator
  • AMC adaptive modulation and coding
  • the CQI is intended to indicate the downlink channel state and is free on the CQI index and / or codebook that points to each entity in the Modulation and Coding Scheme (MCS) table that includes a plurality of entities consisting of a combination of coding rates and modulation schemes. It may include a PMI (Precoding Matrix Index) which is an index of a coding matrix.
  • MCS Modulation and Coding Scheme
  • PMI Precoding Matrix Index
  • the CQI may indicate a channel state for all bands and / or a channel state for some bands of all bands.
  • a radio frame consists of 10 subframes, and one subframe consists of two slots. Slots in a radio frame are numbered with slots # 0 through # 19. The time taken for one subframe to be transmitted is called a transmission time interval (TTI). TTI may be referred to as a scheduling unit for data transmission. For example, one radio frame may have a length of 10 ms, one subframe may have a length of 1 ms, and one slot may have a length of 0.5 ms.
  • the uplink slot and the downlink slot have the same structure.
  • the slot includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain and a plurality of subcarriers in the frequency domain.
  • the OFDM symbol is for representing one symbol period in the time domain.
  • the OFDM symbol may be called an SC-FDMA symbol, an OFDMA symbol, or a symbol interval according to a multiple access scheme.
  • a resource block includes a plurality of subcarriers in one slot.
  • the number N UL of resource blocks included in an uplink slot depends on an uplink transmission bandwidth set in a cell.
  • Each element on the resource grid is called a resource element.
  • Resource elements on the resource grid may be identified by an index pair (k, l) in the slot.
  • one slot includes 7 OFDM symbols in the time domain, the resource block includes 12 subcarriers in the frequency domain, and one resource block includes 7 ⁇ 12 resource elements.
  • the technical idea of this is not limited to this.
  • one slot includes 7 OFDM symbols in a normal cyclic prefix (CP), and one slot includes 6 OFDM symbols in an extended CP.
  • CP normal cyclic prefix
  • PDSCH Physical Downlink Shared Channel
  • the downlink control channels used in 3GPP LTE are PCFICH (Physical Control Format). Indicator Channel (PDCCH), Physical Downlink Control Channel (PDCCH), and Physical Hybrid-ARQ Indicator Channel (PHICH).
  • PDCCH Physical Downlink Control Channel
  • PHICH Physical Hybrid-ARQ Indicator Channel
  • DCI downlink control information
  • DCI indicates uplink resource allocation information, downlink resource allocation information, and uplink transmission power control command for arbitrary UE groups.
  • the PHICH carries an ACK (Acknowledgement) / NACK (Not-Acknowledgement) signal for an uplink HARQ (Hybrid Automatic Repeat Request). That is, the ACK / NACK signal for the uplink data transmitted by the terminal is transmitted on the PHICH.
  • a plurality of PDCCHs may be transmitted in the control region, and the terminal may monitor the plurality of PDCCHs.
  • the PDCCH consists of an aggregation of one or several consecutive CCEs in the control region.
  • the PDCCH composed of one or several consecutive CCEs may be transmitted through the control region after subblock interleaving.
  • CCE is a logical allocation unit used to provide a PDCCH with a coding rate according to a state of a radio channel.
  • the CCE corresponds to a plurality of resource element groups. The correlation between the number of CCEs and the coding rate provided by the CCEs determines the format of the DCI and the number of possible bits of the PDCCH.
  • the following table shows DCI according to DCI format.
  • step S110 the base station determines the PDCCH format according to the DCI to be sent to the terminal, and attaches a CRC (Cyclic Redundancy Check) to the control information.
  • the CRC is masked with a unique identifier (referred to as RNTI (Radio Network Temporary Identifier)) according to the owner or purpose of the PDCCH.
  • RNTI Radio Network Temporary Identifier
  • the PDCCH is for a specific terminal, a unique identifier of the terminal, for example, a C-RNTI (Cell-RNTI) may be masked to the CRC.
  • Cell-RNTI Cell-RNTI
  • a paging indication identifier for example, P-RNTI (P-RNTI)
  • P-RNTI P-RNTI
  • SI-RNTI system information-RNTI
  • RA-RNTI random access-RNTI
  • step S120 the DCI to which the CRC is added is subjected to channel coding to generate coded data.
  • step S130 rate mathing is performed according to the number of CCEs allocated to the PDCCH format.
  • step S140 the coded data is modulated to generate modulation symbols.
  • step S150 modulation symbols are mapped to physical resource elements.
  • a plurality of PDCCHs may be transmitted in one subframe.
  • the UE monitors the plurality of PDCCHs in every subframe.
  • monitoring means that the UE attempts to decode each of the PDCCHs according to the monitored PDCCH format.
  • the base station does not provide the UE with information about where the corresponding PDCCH is.
  • the UE finds its own PDCCH by monitoring a set of PDCCH candidates in a subframe. This is called blind decoding. For example, if the CRC error is not detected by demasking its C-RNTI in the corresponding PDCCH, the UE detects the PDCCH having its DCI.
  • the terminal In order to receive downlink data, the terminal first receives downlink resource allocation on the PDCCH. Upon successful detection of the PDCCH, the UE reads the DCI on the PDCCH. The downlink data on the PDSCH is received using the downlink resource allocation in the DCI. In addition, in order to transmit the uplink data, the terminal first receives the uplink resource allocation on the PDCCH. Upon successful detection of the PDCCH, the UE reads the DCI on the PDCCH. Uplink data is transmitted on the PUSCH by using uplink resource allocation in the DCI.
  • the UE monitors the PDCCH in the downlink subframe and receives the DCI format 0, which is an uplink resource allocation, on the PDCCH 601. Uplink data is transmitted on the PUSCH 602 configured based on the uplink resource allocation.
  • the terminal receives downlink data on the PDSCH 652 indicated by the PDCCH 651.
  • the UE monitors the PDCCH 651 in a downlink subframe and receives downlink resource allocation information on the PDCCH 651.
  • the terminal receives downlink data on the PDSCH 652 indicated by the downlink resource allocation information.
  • the terminal receiving the downlink data 710 from the base station transmits a positive-acknowledgement (ACK) / negative-acknowledgement (NACK) signal 720 after a predetermined time elapses.
  • ACK positive-acknowledgement
  • NACK negative-acknowledgement
  • the ACK / NACK signal 720 becomes an ACK signal when the downlink data 710 is successfully decoded, and becomes an NACK signal when the decoding of the downlink data 710 fails.
  • the base station may transmit the retransmission data 730 of the downlink data until the ACK signal is received or up to the maximum number of retransmissions.
  • the transmission time or resource allocation of the ACK / NACK signal 720 for the downlink data 710 may be dynamically informed by the base station through signaling, or may be promised in advance according to the transmission time or resource allocation of the downlink data 710. It may be.
  • the uplink subframe may be divided into a control region to which a physical uplink control channel (PUCCH) carrying uplink control information is allocated and a data region to which a physical uplink shared channel (PUSCH) carrying uplink data is allocated.
  • PUCCH for one UE is allocated to a resource block pair in a subframe.
  • Resource blocks belonging to a resource block pair occupy different subcarriers in each of a first slot and a second slot.
  • m is a location index indicating a logical frequency domain location of a resource block pair allocated to a PUCCH in a subframe. It is shown that a resource block having the same m value occupies different subcarriers in two slots.
  • PUCCH supports multiple formats.
  • a PUCCH having a different number of bits per subframe may be used according to a modulation scheme dependent on the PUCCH format.
  • the following table shows an example of a modulation scheme and the number of bits per subframe according to the PUCCH format.
  • PUCCH format 1 is used for transmission of SR (Scheduling Request)
  • PUCCH format 1a / 1b is used for transmission of ACK / NACK signal for HARQ
  • PUCCH format 2 is used for transmission of CQI
  • PUCCH format 2a / 2b is used for CQI and Used for simultaneous transmission of ACK / NACK signals.
  • PUCCH format 1a / 1b is used when transmitting only the ACK / NACK signal in the subframe
  • PUCCH format 1 is used when the SR is transmitted alone.
  • PUCCH format 1 is used, and an ACK / NACK signal is modulated and transmitted on a resource allocated to the SR.
  • All PUCCH formats use a cyclic shift (CS) of the sequence in each OFDM symbol.
  • the cyclically shifted sequence is generated by cyclically shifting a base sequence by a specific cyclic shift amount.
  • the specific CS amount is indicated by the cyclic shift index (CS index).
  • Various kinds of sequences can be used as the base sequence. For example, well-known sequences such as pseudo-random (PN) sequences and constant amplitude zero auto-correlation (CAZAC) sequences may be used.
  • PN pseudo-random
  • CAZAC constant amplitude zero auto-correlation
  • ZC Zadoff-Chu sequence is a type of CAZAC sequence.
  • N is the length of the base sequence.
  • the length of the sequence is equal to the number of elements included in the sequence.
  • u may be determined by a cell identifier (ID), a slot number in a radio frame, or the like.
  • ID cell identifier
  • N the length of the base sequence is 12 since one resource block includes 12 subcarriers. Different base sequences define different base sequences.
  • the cyclically shifted sequence r (n, I cs ) may be generated by cyclically shifting the basic sequence r (n) as shown in the following equation.
  • I cs is a cyclic shift index indicating the CS amount (0 ⁇ I cs ⁇ N-1).
  • the available cyclic shift index of the base sequence refers to a cyclic shift index derived from the base sequence according to the CS interval (CS interval). For example, if the length of the base sequence is 12 and the CS interval is 1, the total number of available cyclic shift indices of the base sequence is 12. Alternatively, if the length of the base sequence is 12 and the CS interval is 2, the total number of available cyclic shift indices of the base sequence is six.
  • PUCCH format 1 HARQ ACK / NACK signals in PUCCH format 1 / 1a / 1b (hereinafter referred to as PUCCH format 1)
  • FIG. 10 shows PUCCH format 1 in normal CP in 3GPP LTE
  • FIG. 11 shows PUCCH format 1 in extended CP in 3GPP LTE.
  • the normal CP and the extended CP the number of OFDM symbols included in each slot is different. Only the position and the number of reference signals RS are different, and the structure of ACK / NACK transmission is the same.
  • a modulation symbol d (0) is generated by modulating a 1-bit ACK / NACK signal by BPSK (Binary Phase Shift Keying) or by modulating a 2-bit ACK / NACK signal by QPSK (Quadrature Phase Shift Keying).
  • BPSK Binary Phase Shift Keying
  • QPSK Quadrature Phase Shift Keying
  • the modulation symbol d (0) is spread to the cyclically shifted sequence r (n, I cs ).
  • the one-dimensional spread sequence may be spread using an orthogonal sequence.
  • An orthogonal sequence w i (k) (i is a sequence index, 0 ⁇ k ⁇ K ⁇ 1) having a spreading factor K 4 uses the following sequence.
  • Different spreading coefficients may be used for each slot.
  • the last OFDM symbol in a subframe is used for transmission of a sounding reference signal (SRS).
  • SRS sounding reference signal
  • the two-dimensional spread sequence s (0), s (1), ..., s (9) can be expressed as follows.
  • the cyclic shift index I cs may vary according to the slot number n s in the radio frame and / or the symbol index l in the slot.
  • the initial cyclic shift index is set to 0 and the value of the cyclic shift index is increased by one for each OFDM symbol, as shown in FIGS. 9 and 10,
  • Two-dimensional spread sequences ⁇ s (0), s (1), ..., s (9) ⁇ are transmitted on the corresponding resource block after IFFT is performed.
  • the ACK / NACK signal is transmitted on the PUCCH.
  • the orthogonal sequence index i, the cyclic shift index I cs, and the resource block index m are parameters necessary for configuring the PUCCH and resources used to distinguish the PUCCH (or terminal). If the number of available cyclic shifts is 12 and the number of available orthogonal sequence indexes is 3, PUCCHs for a total of 36 terminals may be multiplexed into one resource block.
  • the three parameters for configuring a PUCCH are obtained from a resource index n (1) PUUCH .
  • Resource index n (1) PUUCH n CCE + N (1) PUUCH , where n CCE is the corresponding DCI (i.e., downlink resource allocation used for reception of downlink data corresponding to ACK / NACK signal) N (1) PUUCH is a value that the base station informs the user equipment as an upper layer message.
  • PUUCH is a value that the base station informs the user equipment as an upper layer message.
  • the resources used for transmission of the PUCCH are implicitly determined depending on the resources of the corresponding PDCCH. This is because the base station does not inform the resources used for the transmission of the PUCCH for the ACK / NACK signal separately, but indirectly through the resources used for the PDCCH used for the transmission of the downlink data.
  • the 3GPP LTE system supports a case in which the downlink bandwidth and the uplink bandwidth are set differently, but this assumes one carrier.
  • the carrier is defined by center frwquency and bandwidth.
  • 3GPP LTE is supported only when the bandwidth of the downlink and the bandwidth of the uplink are the same or different in a situation where one carrier is defined for each of the downlink and the uplink.
  • the 3GPP LTE system supports up to 20MHz and may be different in uplink bandwidth and downlink bandwidth, but only one carrier is supported for uplink and downlink.
  • Spectrum aggregation (or bandwidth aggregation, also called carrier aggregation) is to support a plurality of carriers.
  • Spectral aggregation is introduced to support increasing throughput, to avoid the increased cost of introducing broadband RF devices, and to ensure compatibility with existing systems. For example, if five carriers are allocated as granularity in a carrier unit having a 20 MHz bandwidth, a bandwidth of up to 100 MHz may be supported.
  • Spectral aggregation can be divided into contiguous spectral aggregation where aggregation is between successive carriers in the frequency domain and non-contiguous spectral aggregation where aggregation is between discontinuous carriers.
  • the number of carriers aggregated between the downlink and the uplink may be set differently. The case where the number of downlink carriers and the number of uplink carriers are the same is called symmetric aggregation, and when the number is different, it is called asymmetric aggregation.
  • the size (ie bandwidth) of the multiple carriers may be different. For example, assuming that five carriers are used for the configuration of the 70 MHz band, 5 MHz carrier (carrier # 0) + 20 MHz carrier (carrier # 1) + 20 MHz carrier (carrier # 2) + 20 MHz carrier (carrier # 3) It may be configured as a + 5MHz carrier (carrier # 4).
  • a multiple carrier system refers to a system supporting multiple carriers based on spectral aggregation.
  • Adjacent spectral and / or non-adjacent spectral aggregation may be used in a multi-carrier system, and either symmetric or asymmetric aggregation may be used.
  • MAC medium access control
  • MAC may mean an upper layer of a physical layer, and the meaning of MAC is not limited to a term used in a specific system.
  • FIG. 12 shows an example of a transmitter in which one MAC operates a multi-carrier
  • FIG. 13 shows an example of a receiver in which one MAC operates a multi-carrier.
  • One physical layer (PHY) corresponds to one carrier, and a plurality of physical layers (PHY 0, ..., PHY n-1) are operated by one MAC.
  • the mapping between the MAC and the plurality of physical layers (PHY 0, ..., PHY n-1) may be dynamic or static.
  • FIG. 14 illustrates an example of a transmitter in which multiple MACs operate multiple carriers
  • FIG. 15 illustrates an example of a receiver in which multiple MACs operate multiple carriers. This is different from the embodiments of FIGS. 12 and 13, in which a plurality of MACs MAC 0,..., And MAC n-1 are 1: 1 in a plurality of physical layers PHY 0,..., PHY n-1. Is mapped to.
  • FIG. 16 shows another example of a transmitter in which multiple MACs operate multiple carriers
  • FIG. 17 shows another example of a receiver in which multiple MACs operate multiple carriers.
  • the total number k of MACs and the total number n of physical layers are different from each other.
  • Some MACs (MAC 0, MAC 1) are mapped 1: 1 to the physical layers (PHY 0, PHY 1), and some MACs (MAC k-1) are a plurality of physical layers (PHY n-2, PHY n-2). ).
  • the correspondence of the downlink carrier and the uplink carrier by 1: 1 means that one uplink carrier for performing an uplink operation (for example, ACK / NACK transmission) for one downlink carrier is predefined. .
  • the terminal that receives the transport block TB1 through the downlink carrier # 1 may transmit an ACK / NACK signal for the TB1 through the uplink carrier # 1 corresponding to the downlink carrier # 1.
  • the transport block refers to a unit block in which data is transmitted.
  • the terminal may transmit an ACK / NACK signal for the TB2 through the uplink carrier # 2 corresponding to the downlink carrier # 2.
  • a terminal receiving the transport block TB1 through the downlink carrier # 1 and receiving the transport block TB2 through the downlink carrier # 2 may transmit ACK / NACK signals for the TB1 and TB2 through the uplink carrier # 1.
  • the transport block relates to one codeword and one bit of ACK / NACK signal is required per transport block, then the ACK / NACK signal for TB1 and TB2 requires two bits.
  • the time, frequency, and code resources used to transmit the ACK / NACK signal are called ACK / NACK resources.
  • the indices of the ACK / NACK resources (or PUCCH resources) required for transmitting the ACK / NACK signal on the PUCCH are orthogonal sequence index i, cyclic shift index I cs, and resource block index m.
  • the ACK / NACK resource may include at least one of an orthogonal sequence, a cyclic shift, a resource block, and a combination thereof.
  • a plurality of ACK / NACK resources are used to transmit one ACK / NACK signal for a plurality of carriers.
  • the first ACK / NACK resource and the second ACK / NACK resource are used to transmit one ACK / NACK signal for the first carrier and the second carrier.
  • At least two of an orthogonal sequence index i, a cyclic shift index I cs , a resource block index m, and a combination thereof are allocated to configure a PUCCH using two allocated ACK / NACK resources, and a first carrier is formed on the PUCCH. And transmits one ACK / NACK signal for the second carrier.
  • the number of downlink carriers is two, and the number of uplink carriers associated with the downlink carriers is one, but the number of downlink carriers and / or the number of uplink carriers There is no limit.
  • the base station transmits the first transport block 315 on the PDSCH indicated by the first PDCCH 310 on the downlink carrier 1, and on the PDSCH indicated by the second PDCCH 320 on the downlink carrier 2.
  • the second transport block 325 is transmitted.
  • the terminal transmits the ACK / NACK signal 350 for the first and second transport blocks 315 and 325 using the first and second ACK / NACK resources through the uplink carrier 1.
  • the first and second ACK / NACK resources may be obtained from the resources of the corresponding PDCCH.
  • the first ACK / NACK resource is obtained based on the first CCE of the first PDCCH 310
  • the second ACK / NACK resource is obtained based on the first CCE of the second PDCCH 320.
  • ACK / NACK resources can be obtained based on the number of first CCEs or the index of the first CCE.
  • the first and second ACK / NACK resources may be directly informed to the terminal through the RRC message or system information, the base station.
  • the first ACK / NACK resource is obtained based on the resources of the first PDCCH 1810 or the resources of the second PDCCH 320, and the second ACK / NACK resource is the first ACK / NACK. Can be obtained from a resource.
  • the second ACK / NACK resource may have a predetermined offset from the first ACK / NACK resource. The offset may be specified in advance or the base station may inform the terminal.
  • the base station informs which one of the resources of the first PDCCH 310 and the resources of the second PDCCH 320 is obtained from the first ACK / NACK resource, or may be known from the relationship between carriers.
  • the first ACK / NACK resource may be obtained from the resources of the PDCCH of the downlink carrier associated with the uplink carrier.
  • the first ACK / NACK resource may be obtained from the resource of the PDDCH of the downlink carrier designated in advance to obtain the ACK / NACK resource.
  • the first ACK / NACK resource may be obtained from the resource of the PDCCH of the subframe closest to the subframe in which the ACK / NACK signal is transmitted.
  • the wireless device 500 includes an encoder 510, a mapper 520, a spatial processor 530, a first diffuser 540, a second diffuser 550, and two transmit antennas 592 and 594. It includes.
  • the encoder 510 receives the information bits and generates encoded bits. If one bit of ACK / NACK is required for each transport block, the size of the information bits of the ACK / NACK for the first transport block and the second transport block is 2 bits. By using these two bits as encoded bits, two bits of encoded ACK / NACK can be obtained.
  • the mapper 520 generates the modulation symbols by mapping the encoded bits to constellations.
  • the modulation symbol is called a complex-valued symbol representing the position of the constellation of the corresponding encoded bit, the modulation symbol may be represented in various forms depending on the implementation manner.
  • the mapper 520 may perform constellation mapping based on resource selection described later.
  • the space processor 530 processes a space-code block code (SCBC) to the modulation symbol to generate a transmission symbol, and transmits it to the first spreader 540 and the second spreader 550.
  • SCBC space-code block code
  • the first spreader 540 spreads the transmitted symbols by using the first and second ACK / NACK resources and sends them to the first transmit antenna 592.
  • the second spreader 550 spreads the transmitted symbols by using the first and second ACK / NACK resources and sends them to the second transmit antenna 593.
  • the spatial processor 530 may use at least one of the SCBCs shown in the following table based on an Alamouti matrix.
  • Each row of the SCBC matrix points to a resource (ie, an ACK / NACK resource), and each column points to an antenna.
  • the first column points to the first antenna and the second column points to the second antenna.
  • the first row points to the first ACK / NACK resource and the second row points to the second ACK / NACK resource.
  • the input symbol is a modulation symbol generated by the mapper 520 or a complex value symbol processed by the modulation symbol.
  • the symbols output from the SCBC are called transmission symbols.
  • four transmission symbols s1, s2, s2 * , and s1 * are output from the spatial processor.
  • S1 and s2 output by the SCBC are transmitted through the first transmit antenna.
  • s1 is transmitted using the first ACK / NACK resource
  • s2 is transmitted using the second ACK / NACK resource. If the ACK / NACK resource is used to configure the above-described PUCCH, s1 is transmitted on the PUCCH in the form of PUCCH formats 1a / 1b using the first ACK / NACK resource.
  • the first ACK / NACK resource is the first cyclic shift index and the second ACK / NACK resource is the second cyclic shift index
  • s1 is spread in a cyclically shifted sequence by the first cyclic shift index
  • s2 Is spread in a cyclically shifted sequence by the second cyclic shift index.
  • -s2 * and s1 * output by the SCBC are transmitted through the second transmit antenna.
  • -s2 * is transmitted using the first ACK / NACK resource
  • s1 * is transmitted using the second ACK / NACK resource.
  • SCBC uses different resources for each antenna for two transmission symbols corresponding to two resources, and allows the transmission symbols to have a complex conjugate or negative complex conjugate for each antenna. Accordingly, s1 corresponding to the first ACK / NACK resource in the first antenna is represented by a complex conjugate symbol s1 * corresponding to the second ACK / NACK in the second antenna. S2 corresponding to the second ACK / NACK resource in the second antenna is represented by a negative complex conjugate symbol -s2 * corresponding to the second ACK / NACK in the second antenna.
  • the ACK / NACK signal for the first transport block TB1 is called a first ACK / NACK signal
  • the ACK / NACK signal for a second transport block TB2 is called a second ACK / NACK signal.
  • s1 is a modulation symbol of the first ACK / NACK signal
  • s2 is a modulation symbol of the second ACK / NACK signal.
  • the first ACK / NACK resource used by the first ACK / NACK signal is referred to as a first cyclic shift index I cs1
  • the second ACK / NACK resource used by the second ACK / NACK signal is referred to as a second. It is assumed that the cyclic shift index I cs2 is different, that is, orthogonal sequence index i and resource block index m are the same.
  • the two-dimensional spread sequence s (0), s (1), ..., s (9) of the above-described PUCCH for each antenna is as follows.
  • the SCBC may be defined to use one ACK / NACK resource for one antenna. This example is as follows:
  • first and second ACK / NACK signals are 2 bits
  • one symbol s1 (or s2) is generated through QPSK modulation, and a first ACK / NACK resource or a second ACK / NACK resource is generated for each antenna. Is to send through.
  • the bits of one ACK / NACK signal for the first and second transport blocks for two carriers may be greater than two bits.
  • the first ACK / NACK signal is 1 bit and the second ACK / NACK signal is 2 bits.
  • the resource selection can increase the payload.
  • bits may be represented depending on whether the resource is used (or selected). For example, to allocate K resources and to represent K bits ⁇ b 0 , b 1 , ..., b K-1 ⁇ , replace '0' or '1' of bit b i with the i th resource. It can be displayed depending on whether it is selected (marked as ON / OFF). 'ON' of a resource means selecting a corresponding resource (or transmitting above a certain level), and 'OFF' means not selecting a corresponding resource (or below a certain level).
  • bit 24 shows a representation of a bit when two resources are allocated.
  • resource # 0 and resource # 1 When resource # 0 and resource # 1 are allocated, an information bit of '0' or '1' may be indicated depending on whether resource # 0 or resource # 1 is turned on or off.
  • bit '0' is represented by resource # 0 ON and resource # 1 is OFF
  • bit '1' is represented by resource # 0 OFF and resource # 1 ON, but the order of bit values and resources is only an example. Do.
  • the first ACK / NACK signal is 1 bit
  • the second ACK / NACK signal is 2 bits
  • the following property mapping may be performed through resource selection.
  • the ACK / NACK signal for the first transport block TB1 is called a first ACK / NACK signal
  • the ACK / NACK signal for a second transport block TB2 is called a second ACK / NACK signal.
  • the obtained modulation symbol may be applied to at least one of the SCBCs shown in Tables 7 and 8 to transmit ACK / NACK signals through multiple antennas.
  • SCBC 26 shows an example of application to a plurality of carriers.
  • the aforementioned SCBC supports two antennas. If there are more than two carriers, SCBC may be applied by grouping a plurality of carriers in groups of two.
  • downlink carriers # 1, # 2, # 3, and # 4 are the first group, and downlink carriers # 3, # 4 are the second group.
  • the symbols S1 and S1 of the ACK / NACK signals for each group are obtained.
  • a symbol of an ACK / NACK signal of a group may modulate ACK / NACK signals of carriers belonging to each group. If there are two carriers in the group, and there are ACK / NACK signals of 1 bit per carrier, one symbol is generated through QPSK modulation.
  • symbols S1 and S2 of a bundling ACK / NACK signal for each group may be obtained.
  • the bundled ACK / NACK signal is a value representing a plurality of ACK / NACK signals for a plurality of transport blocks received by carriers belonging to each group. For example, if the plurality of ACK / NACK signals are all ACK, the bundled ACK / NACK signal may be ACK. If at least one ACK / NACK signal is NACK, the bundled ACK / NACK signal may be NACK.
  • At least one of the SCBCs shown in Tables 7 and 8 may be applied to the symbols S1 and S2.
  • the technical idea of the present invention is not limited to a specific channel or information.
  • the technical idea of the present invention can be applied to information transmitted on a channel configured from a plurality of resources.
  • the transmitter 1110 includes an HARQ processor 1111.
  • the receiver 1115 includes an ACK / NACK generator 1112 and a space processor 1113.
  • the HARQ processor 1111 sends the transport block to the receiver 1115 and retransmits the transport block when a NACK signal is received.
  • the ACK / NACK generator 1112 generates ACK / NACK signals for a plurality of transport blocks received through a plurality of carriers.
  • the ACK / NACK generator 1112 may include an encoder and a mapper to encode an ACK / NACK signal and generate a modulation symbol.
  • the space processor 1113 transmits the ACK / NACK signal to the transmitter 1110 through a plurality of ACK / NACK resources and a plurality of antennas.
  • the SCBC may be implemented by the space processor 1113.
  • the terminal 1200 includes a processor 1210, a memory 1220, a display unit 1230, and an RF unit 1240.
  • the RF unit 1240 is connected to the processor 1210 and transmits and / or receives a radio signal.
  • the memory 1220 is connected to the processor 1210 and stores information necessary for an operation.
  • the display unit 1230 displays various information of the terminal 1200 and may use well-known elements such as a liquid crystal display (LCD) and organic light emitting diodes (OLED).
  • the processor 1210 generates an ACK / NACK signal through the proposed method and transmits the signal through a plurality of resources and a plurality of antennas.
  • the processor 1210 may implement a physical layer based on the 3GPP LTE / LTE-A standard.
  • the processor 1210 may include an application-specific integrated circuit (ASIC), another chipset, a logic circuit, and / or a data processing device.
  • the memory 1220 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium, and / or other storage device.
  • the RF unit 1240 may include a baseband circuit for processing a radio signal.
  • the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
  • the module may be stored in the memory 1220 and executed by the processor 1210.
  • the memory 1220 may be inside or outside the processor 1210 and may be connected to the processor 1210 by various well-known means.
  • the subblock is a resource unit for mapping time domain symbols and / or frequency domain symbols to radio resources, and may include, for example, 12 subcarriers. Each subblock may or may not be adjacent to each other. The amount (or size) of resources included in each subblock may be all the same or may be different. For example, subblock # 1 may include 12 subcarriers, but subblock # 2 may include 24 subcarriers.
  • the subblock may be called another name such as a cluster, a resource block, a subchannel, and the like. Alternatively, one or more subblocks may correspond to one carrier. Carrier is defined as the center frequency and bandwidth.
  • the signal processing apparatus 2110 includes a discrete fourier transform (DFT) unit 2111, a subcarrier mapper 2112, an inverse fast fourier transform (IFFT) unit 2113, and a CP insertion unit 2114.
  • the DFT unit 2111 performs DFT on the complex-valued symbols to be output and outputs the DFT symbols.
  • Subcarrier mapper 2112 maps the DFT symbols to each subcarrier in the frequency domain.
  • the IFFT unit 2113 performs an IFFT on the symbols mapped in the frequency domain and outputs a time domain signal.
  • the CP inserter 2114 inserts a CP into the time domain signal.
  • the time domain signal in which the CP is inserted becomes an OFDM symbol. If the used sequence is a frequency-domain sequence that has already been DFT spread, IFFT may be performed immediately without performing a DFT separately.
  • DFT symbols output from the DFT unit are mapped to contiguous subcarriers in the frequency domain. This is called localized mapping.
  • the DFT symbols output from the DFT unit are mapped to non-contiguous subcarriers.
  • the DFT symbols may be mapped to subcarriers distributed at equal intervals in the frequency domain. This is called distributed mapping.
  • the signal processing apparatus 2210 includes a DFT unit 2211, a subcarrier mapper 2212, an IFFT unit 2213, and a CP insertion unit 2214.
  • the DFT symbols output from the DFT unit 2211 are divided into N subblocks (N is a natural number).
  • N subblocks may be represented by subblock # 1, subblock # 2, ..., subblock #N.
  • the subcarrier mapper 2212 maps N subblocks to subcarriers in a frequency domain in units of subblocks.
  • the subcarrier mapper 2212 may perform local mapping or distributed mapping on a subblock basis.
  • the IFFT unit 2213 outputs a time domain signal by performing IFFT on the subblocks mapped in the frequency domain.
  • the CP insertion unit 2214 inserts a CP into the time domain signal.
  • the signal processing device 2210 may support a single carrier or a multi-carrier. When only a single carrier is supported, all N subblocks correspond to one carrier. When supporting multiple carriers, at least one subblock of N subblocks may correspond to each carrier.
  • the signal processing apparatus 2310 includes a DFT unit 2311, a subcarrier mapper 2312, a plurality of IFFT units 2313-1, 2313-2,..., 2313 -N, and a CP insertion unit 2214. (N is a natural number).
  • the DFT symbols output from the DFT unit 2311 are divided into N subblocks.
  • the subcarrier mapper 2312 maps N subblocks to subcarriers in a frequency domain in units of subblocks.
  • the subcarrier mapper 2312 may perform local mapping or distributed mapping on a subblock basis. IFFT is performed independently for each subblock mapped in the frequency domain.
  • the CP insertion unit 2314 inserts a CP into the time domain signal.
  • the n th time domain signal is multiplied by an n th carrier f n signal to generate an n th radio signal.
  • a CP is inserted by the CP inserter 2314.
  • Each subblock may correspond to each carrier.
  • Each subblock may correspond to carriers adjacent to each other or may correspond to non-adjacent carriers.
  • the signal processing unit 2410 includes a code block divider 2411, a chunk divider 2412, a plurality of channel coding units 2413-1,..., 2413 -N, and a plurality of modulators 2444-. 1, ..., 2414-N), a plurality of DFT units 2415-1, ..., 2425-N, a plurality of subcarrier mappers 2416-1, ..., 2241-N, a plurality of IFFTs Section 2417-1, ..., 2417-N and CP insertion section 2418 (N is a natural number).
  • N may be the number of multicarriers used by the multicarrier transmitter.
  • the code block divider 2411 divides a transport block into a plurality of code blocks.
  • the chunk divider 2412 divides the code block into a plurality of chunks.
  • the code block may be referred to as data transmitted from the multicarrier transmitter, and the chunk may be referred to as a data segment transmitted through one carrier of the multicarrier.
  • DFT is performed in chunks.
  • a transmission scheme in which DFT is performed in chunks is referred to as chunk specific DFT-s OFDM or Nx SC-FDMA. This may be used in contiguous carrier assignment or non-adjacent carrier assignment.
  • the divided chunks become complex symbols through each of the plurality of channel coding units 2413-1,..., 4241 -N and the plurality of modulators 2414-1,.
  • the complex symbols include a plurality of DFT units 2415-1,..., 2241 -N, respectively, a plurality of subcarrier mappers 2416-1,..., 2241 -N, and a plurality of IFFT units 2417-1. , ..., 2417-N), and then add to each other at the CP insertion unit 2418.
  • the OFDM symbol may be a time domain symbol applied to any of multiple access schemes such as OFDMA, DFT-s OFDM, clustered DFT-s OFDM, and / or chunk-specific DFT-s OFDM, and is not necessarily limited to a specific multiple access scheme. no.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

L'invention concerne un procédé et un appareil pour la transmission d'un signal ACK/NACK HARQ (demande automatique de répétition hybride). Un premier bloc de transmission est reçu par l'intermédiaire d'une première onde porteuse, et un deuxième bloc de transmission est reçu par l'intermédiaire d'une deuxième onde porteuse. Un premier signal ACK/NACK est déterminé par rapport audit premier bloc de transmission et une première ressource ACK/NACK correspondant audit premier signal ACK/NACK. Un deuxième signal ACK/NACK est déterminé par rapport audit deuxième bloc de transmission et une deuxième ressource ACK/NACK correspondant au deuxième signal ACK/NACK. Un premier symbole de transmission dudit premier signal ACK/NACK est transmis à une première antenne au moyen de ladite première ressource ACK/NACK, et un premier symbole de transmission dudit deuxième signal ACK/NACK est transmis à une deuxième antenne au moyen de ladite deuxième ressource ACK/NACK.
PCT/KR2009/006681 2008-11-14 2009-11-13 Procédé et appareil pour la transmission de signaux ack/nack harq dans un système à antennes multiples WO2010056060A2 (fr)

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US11447908P 2008-11-14 2008-11-14
US11448008P 2008-11-14 2008-11-14
US61/114,480 2008-11-14
US61/114,479 2008-11-14
US11511308P 2008-11-17 2008-11-17
US61/115,113 2008-11-17
US24316509P 2009-09-17 2009-09-17
US61/243,165 2009-09-17

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070153928A1 (en) * 2005-12-16 2007-07-05 Fang Liu HARQ method and system
WO2008039025A2 (fr) * 2006-09-28 2008-04-03 Lg Electronics Inc. Procédé de transmission de signal ack-nack et procédé d'exécution de transmission de signal
US20080175195A1 (en) * 2007-01-10 2008-07-24 Samsung Electronics Co., Ltd. Method and apparatus for allocating and signaling ack/nack resources in a wireless communication system
US20080267158A1 (en) * 2007-04-26 2008-10-30 Jianzhong Zhang Transmit diversity for acknowledgement and category 0 bits in a wireless communication system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070153928A1 (en) * 2005-12-16 2007-07-05 Fang Liu HARQ method and system
WO2008039025A2 (fr) * 2006-09-28 2008-04-03 Lg Electronics Inc. Procédé de transmission de signal ack-nack et procédé d'exécution de transmission de signal
US20080175195A1 (en) * 2007-01-10 2008-07-24 Samsung Electronics Co., Ltd. Method and apparatus for allocating and signaling ack/nack resources in a wireless communication system
US20080267158A1 (en) * 2007-04-26 2008-10-30 Jianzhong Zhang Transmit diversity for acknowledgement and category 0 bits in a wireless communication system

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