WO2007149049A1 - Retransmission de données dans un système à entrées multiples sorties multiples (mimo) - Google Patents

Retransmission de données dans un système à entrées multiples sorties multiples (mimo) Download PDF

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Publication number
WO2007149049A1
WO2007149049A1 PCT/SG2006/000169 SG2006000169W WO2007149049A1 WO 2007149049 A1 WO2007149049 A1 WO 2007149049A1 SG 2006000169 W SG2006000169 W SG 2006000169W WO 2007149049 A1 WO2007149049 A1 WO 2007149049A1
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WO
WIPO (PCT)
Prior art keywords
data stream
retransmission
data
chase
processing
Prior art date
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PCT/SG2006/000169
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English (en)
Inventor
Ronghong Mo
Ping Luo
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Panasonic Corporation
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Publication date
Application filed by Panasonic Corporation filed Critical Panasonic Corporation
Priority to PCT/SG2006/000169 priority Critical patent/WO2007149049A1/fr
Priority to CNA2006800550221A priority patent/CN101485133A/zh
Publication of WO2007149049A1 publication Critical patent/WO2007149049A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
    • 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
    • H04L1/0618—Space-time coding
    • H04L1/0637—Properties of the code
    • H04L1/0643—Properties of the code block codes
    • 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
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy
    • 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
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
    • H04B7/0669—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different channel coding between antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
    • H04B7/0671—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different delays between antennas

Definitions

  • MIMO Multiple Input Multiple Output
  • the invention relates broadly to a method for retransmission of data in a multiple input multiple output (MIMO) system, a method for receiving retransmission of data in a MIMO system, a transmitter for transmitting retransmission of data in a MIMO system and to a receiver for receiving retransmission of data in a MIMO system.
  • MIMO multiple input multiple output
  • wireless communication capacity is typically enhanced by using simultaneous transmissions of multiple data streams in a multiple input multiple output (MIMO) communication system that employs multiple transmit (N T ) antennas and multiple receive (N R ) antennas.
  • MIMO multiple input multiple output
  • the MIMO system is typically configured either to improve performance through transmit diversity or to increase system capacity by using spatial multiplexing (SM).
  • SM spatial multiplexing
  • Transmit diversity is typically achieved by using space-time block coding (STBC) which provides space and time diversity.
  • STBC space-time block coding
  • the STBC is disclosed in "Space-Time Block Codes from Orthogonal Designs", IEEE Transactions on information theory, Vol. 45, pp. 1456-1467, July 1999 (by Tarokh, V., Jafarkhani, H., Calderbank, A. R.) and in WO 99/15871.
  • Increasing system capacity by using SM is disclosed in "V-BLAST: an architecture for realising very high data rates over the rich-scattering wireless channel” in the published papers of the 1998 URSI International Symposium on Signals, Systems and Electronics, Pisa, Italy, Sep. 29 to Oct. 2, 1998 (by P W Wolniansky et al.).
  • orthogonal frequency division multiplexing is typically used.
  • OFDM orthogonal frequency division multiplexing
  • a hybrid automatic repeat query (HARQ) technique is typically used.
  • the HARQ technique typically comprises resending data packets when errors are detected in previously transmitted data packets received at an intended receiver.
  • each data packet to be transmitted by a transmitter is attached with a cyclic redundancy check (CRC) code for error detection.
  • CRC cyclic redundancy check
  • the contents of each received packet are validated using CRC. If the received packet fails the CRC validation, the receiver sends a non-acknowledgment (NACK) signal back to the transmitter to request for a retransmission.
  • NACK non-acknowledgment
  • an acknowledgement (ACK) signal is sent back to the transmitter to acknowledge correct decoding of the data packets.
  • ACK acknowledgement
  • a Chase combining protocol a data packet (ie. a Chase packet), substantially identical to an originally transmitted data packet, is retransmitted by the transmitter when it receives a retransmit request.
  • the transmitter initially transmits a data packet comprising system information and some parity information.
  • the initial data packet fails the CRC validation and retransmission is requested, more parity information is typically transmitted in a retransmitted packet (ie. an IR packet) to provide more redundancy to assist in decoding of the system information.
  • the parity information in the retransmitted packet is different from the parity information contained in the originally transmitted packet.
  • the retransmitted IR packet is not a repetition of the originally transmitted packet.
  • MIMO system when multiple data streams are transmitted simultaneously from multiple transmit antennas using spatial multiplexing, data streams transmitted over different antennas typically have different error performances since the streams experience different degrees of link conditions. It has been recognized that it is typically unlikely that the data streams experience detection errors simultaneously, especially when a large number of antennas are employed.
  • an antenna dependent HARQ transmission scheme could be used, where multiple antenna-dependent CRC encoders may be employed in the transmitter of the MIMO system so that independent HARQ processes may be used for each data stream.
  • each received data stream may go through an independent CRC validation.
  • Multiple ACK/NACK indications may then be sent by the receiver back to the transmitter.
  • the transmitter may retransmit data streams based on the ACK/NACK indications.
  • the system throughput of the MIMO system may be further increased since only the data streams that fail the CRC validation are retransmitted. This is in contrast to a situation where all the data streams are retransmitted -when only one CRC is used for the MIMO system.
  • both retransmitted data streams and new data streams may be encoded using STBC to improve the transmission quality of both kinds of data streams.
  • the parity information transmitted in the initial packet may be corrupted and thus the parity information is not sufficient for decoding operations.
  • Another problem that may arise is that since the link conditions between the transmitter and the receiver may not change significantly during two consecutive transmission intervals, a retransmission of the originally transmitted packet (i.e. in accordance with the Chase protocol) may still result in decoding errors.
  • the system information contained in the originally transmitted packet may be corrupted significantly such that the system information may not be decoded even with the aid of more redundancy parity information sent in the retransmitted IR packet.
  • a method for retransmission of data in a multiple input multiple output (MIMO) system comprising utilising a combination of a Chase combining protocol and an incremental redundancy (IR) protocol in retransmitting the data.
  • MIMO multiple input multiple output
  • the utilising the combination of the Chase combining protocol and the IR protocol may comprise for a first retransmission of the data, retransmitting the data based on a first IR data stream containing additional parity information; and for a second retransmission of the data, retransmitting the data based on a first Chase data stream.
  • the method may further comprise for a third retransmission of the data, retransmitting the data based on a second IR data stream containing more additional parity information than the first IR data stream.
  • the method may further comprise for a fourth retransmission of the data, retransmitting the data based on a second Chase data stream.
  • the Chase combining protocol and the IR protocol may loop back to another retransmission of the original data stream.
  • the first Chase data stream may comprise IQ swapping of the original data stream
  • the second Chase data stream may comprise phase rotation of the original data stream.
  • the utilising the combination of Chase combining protocol and the IR protocol may comprise for a first retransmission of the data, retransmitting the data based on both a first IR data stream containing additional parity information and a first Chase data stream.
  • the method may further comprise for a second retransmission of the data, retransmitting the data based on both a second IR data stream containing additional parity information and a second Chase data stream.
  • the first Chase data stream may comprise IQ swapping of the original data stream
  • the second Chase data stream may comprise phase rotating the original data stream
  • said utilising the combination of the Chase combining protocol and the IR protocol may loop back to another retransmission of the original data stream.
  • the method may further comprise changing from a spatial multiplexing (SM)- encoder transmission mode to a space-time block coding (STBC)-encoder transmission mode for STBC-encoding one or more new data streams with one or more retransmission data streams.
  • SM spatial multiplexing
  • STBC space-time block coding
  • a method for receiving retransmission of data in a multiple input multiple output (MIMO) system comprising utilising a combination of a Chase combining protocol retransmission packet processing and an incremental redundancy
  • IR protocol retransmission packet processing Said utilising the combination of a Chase combining protocol retransmission packet processing and an IR protocol retransmission packet processing may comprise, for a first retransmission of the data, processing a first IR data stream containing additional parity information; and for a second retransmission of the data, processing a first Chase data stream.
  • the method may further comprise for a third retransmission of the data, processing a second IR data stream containing more additional parity information than the first I R data stream .
  • the method may further comprise for a fourth retransmission of the data, processing a second Chase data stream.
  • the processing may loop back to processing another retransmission of the original data stream.
  • Said processing the first Chase data stream may comprise reversing IQ swapping the original data stream, and processing the second Chase data stream may comprise reversing phase rotation of the original data stream.
  • Said utilising the combination of a Chase combining protocol retransmission packet processing and an IR protocol retransmission packet processing may comprise, for a first retransmission of the data, processing both a first IR data stream containing additional parity information and a first Chase data stream.
  • the method may further comprise for a second retransmission of the data, processing both a second IR data stream containing additional parity information and a second Chase data stream.
  • Said processing the first Chase data stream may comprise reversing IQ swapping the original data stream, and processing the second Chase data stream may comprise reversing phase rotation of the original data stream.
  • the processing may loop back to processing another retransmission of the original data stream.
  • the method may further comprise changing from a Vertical Bell Laboratories layered Space Time (VBLAST) detection mode to a space-time block coding (STBC) detection mode for detecting one or more STBC-encoded data streams.
  • VBLAST Vertical Bell Laboratories layered Space Time
  • STBC space-time block coding
  • a transmitter for retransmitting data in a multiple input multiple output (MIMO) system comprising, a transmitter control module utilising a combination of a Chase combining protocol and an incremental redundancy (IR) protocol in retransmitting the data.
  • MIMO multiple input multiple output
  • IR incremental redundancy
  • the transmitter control module may retransmit the data based on a first IR data stream containing additional parity information; and for a second retransmission of the data, the transmitter control module may retransmit the data based on a first Chase data stream.
  • the transmitter control module may retransmit the data based on a second IR data stream containing more additional parity information than the first IR data stream.
  • the transmitter control module may retransmit the data based on a second Chase data stream.
  • the transmitter control module may loop back to another retransmission of the original data stream.
  • the first Chase data stream may comprise IQ swapping the original data stream
  • the second Chase data stream may comprise phase rotating the original data stream.
  • the transmitter control module may retransmit the data based on both a first IR data stream containing additional parity information and a first Chase data stream.
  • the transmitter control module may retransmit the data based on both a second IR data stream containing additional parity information and a second Chase data stream.
  • the first Chase data stream may comprise IQ swapping the original data stream
  • the second Chase data stream may comprise phase rotating the original data stream
  • the transmitter control module may loop back to another retransmission of the original data stream.
  • the transmitter control module utilising the combination of the Chase combining protocol and the IR protocol in retransmitting the data may further comprise changing from a spatial multiplexing (SM)-encoder transmission mode to a space-time block coding (STBC)-encoder transmission mode for STBC-encoding one or more new data streams with one or more retransmission data streams.
  • SM spatial multiplexing
  • STBC space-time block coding
  • a receiver for receiving retransmission of data in a multiple input multiple output (MIMO) system comprises a receiver control module utilising a combination of a Chase combining protocol retransmission packet processing and an incremental redundancy (IR) protocol retransmission packet processing.
  • the receiver control module may process a first IR data stream containing additional parity information; and for a second retransmission of the data, the receiver control module may process a first Chase data stream.
  • the receiver control module may process a second IR data stream containing more additional parity information than the first IR data stream.
  • the receiver control module may process a second Chase data stream.
  • the receiver control module may process another retransmission of the original data stream.
  • the processing the first Chase data stream may comprise reversing IQ swapping of the original data stream, and the processing the second Chase data stream may comprise reversing phase rotation of the original data stream.
  • the receiver control module may process both a first IR data stream containing additional parity information and a first Chase data stream.
  • the receiver control module may process both a second IR data stream containing additional parity information and a second Chase data stream.
  • the processing the first Chase data stream may comprise reversing IQ swapping the original data stream, and processing the second Chase data stream may comprises reversing phase rotation of the original data stream. If the second retransmission is unsuccessful, the receiver control module may process another retransmission of the original data stream.
  • the utilising the combination of the Chase combining protocol retransmission packet processing and the IR protocol retransmission packet processing may further comprise changing from a Vertical Bell Laboratories layered Space Time (VBLAST) detection mode to a space-time block coding (STBC) detection mode for detecting one or more STBC-encoded data streams.
  • VBLAST Vertical Bell Laboratories layered Space Time
  • STBC space-time block coding
  • Figure 1 is a schematic modular diagram of a transmitter in a MIMO system.
  • Figure 2 is a schematic modular diagram of a receiver in the MIMO system.
  • Figure 3(a) is a schematic block diagram illustrating one transmitter buffer control module in a state of preparing a new data stream.
  • Figure 3(b) is a schematic block diagram illustrating the transmitter buffer control module in a state of preparing a retransmission data stream.
  • Figure 4(a) is a schematic diagram illustrating selection of a SM transmission mode based on ACK/NACK feedback signals.
  • Figure 4(b) is a schematic diagram illustrating selection of a STBC transmission mode based on ACK/NACK feedback signals.
  • Figure 4(c) is a schematic diagram illustrating another selection of a STBC transmission mode based on ACK/NACK feedback signals.
  • Figures 5(a) to (d) are schematic diagrams illustrating a HARQ procedure.
  • Figures 6(a) and (b) are schematic diagrams illustrating another HARQ procedure.
  • Figures 7(a) to (c) are schematic diagrams illustrating detection modes selection methods at a MIMO detection mode selection module.
  • Figure 8(a) is a schematic block diagram illustrating one HARQ control module in a state of receiving a new data stream.
  • Figure 8(b) is a schematic block diagram illustrating the HARQ control module in a state of receiving a retransmission data stream.
  • Figure 9 is a schematic flowchart summarising the transmitting operation of the transmitter.
  • the example implementation utilises a combination of a Chase combining protocol and an incremental redundancy (IR) protocol in retransmitting the data.
  • IR incremental redundancy
  • a new data stream refers to a data stream which has not been previously transmitted while a retransmission data stream refers to a data stream which is being retransmitted based on a previously transmitted data stream.
  • Figure 1 is a schematic modular diagram of the MIMO system transmitter 100. Data processing is performed for each antenna chain 102, 104 and different data streams are transmitted from the transmitter 100 using the transmit antennas 106, 108. In the example implementation, an antenna dependent ARQ process is used.
  • an input binary data sequence indicated at numeral 110 is input into a data segmentation module 112.
  • the input binary data sequence is segmented into two new data streams by the data segmentation module 112.
  • the data segmentation module 112 is coupled to a transmitter control module 113.
  • the transmitter control module 113 comprises a multiple ACK/NACK receiver module 114, transmitter buffer control modules 116, 118 coupled to the multiple ACK/NACK receiver module 114, interleaving modules 120, 122 coupled to the transmitter buffer control modules 116, 118 respectively, symbol mapping modules 124, 126 coupled to the interleaving modules 120, 122 respectively, pilot insertion modules 128, 130 coupled to the symbol mapping modules 124, 126 respectively, a MIMO mode selection and MIMO encoding module 132 coupled to the pilot insertion modules 128, 130 and coupled to the multiple ACK/NACK receiver module 114.
  • the multiple ACK/NACK receiver module 114 is provided to receive ACK/NACK feedback signals from the MIMO system receiver (not shown) in relation to previously transmitted data streams.
  • the ACK/NACK signals are transmitted by the receiver (not shown) over control channels.
  • the multiple ACK/NACK receiver module 114 monitors the control channels and decodes the ACK/NACK signals.
  • the segmented new data streams and the HARQ statuses received at the multiple ACK/NACK receiver module 114 are sent to transmitter buffer control modules 116, 118.
  • the respective transmitter buffer control module 116 or 118 receives a new input data stream from the data segmentation module 112, performs a CRC attachment process and encodes the data stream using an encoder. On the other hand, if a retransmission data stream is to be transmitted, the respective transmitter buffer control module 116 or 118 selects a retransmission protocol and extracts the relevant data from a transmitter buffer (not shown). The processes carried out by the transmitter buffer control modules 116, 118 will be described in further detail below.
  • the data streams from the transmitter buffer control modules 116, 118 are outputted to the interleaving modules 120, 122 for an interleaving operation.
  • the interleaver modules 120, 122 are used to reorder the data bits of the data streams so that the burst errors in the data streams could be reduced.
  • Bit-to-symbol mapping operations are carried out on the interleaved data streams by the symbol mapping modules 124, 126 based on various modulation schemes such as Multiple Phase-Shift Keying (MPSK) and M-ary Quadrature Amplitude Modulation
  • MPSK Multiple Phase-Shift Keying
  • the data streams are sent to the pilot insertion modules 128, 130 to insert pilot signals in the data streams to assist in channel estimation and synchronization for
  • the data streams are sent to the MIMO mode selection and MIMO encoding module 132 and a MIMO transmission mode (either SM or STBC) is selected.
  • the data streams are MIMO encoded based on the selected MIMO transmission mode by the MIMO mode selection and MIMO encoding module 132.
  • each of the data streams in a serial format is divided into data blocks of size N, where N is the number of subcarriers used in OFDM systems.
  • the data blocks are output to serial-to-parallel conversion modules 134, 136.
  • the serial- to-parallel conversion modules 134, 136 convert the serial data streams per block into parallel data streams and output the parallel data streams to Inverse Fast Fourier Transform (IFFT) operations modules 138, 140.
  • IFFT operations modules 138, 140 perform N-point IFFT operations on the data streams per block and send the parallel data streams to parallel-to-serial conversion modules 142, 144.
  • the data streams per block are output to cyclic prefix attachment modules 146, 148.
  • cyclic prefixes are appended to the beginning of each block and to form OFDM symbols.
  • the cyclic prefixes are used to overcome inter- symbol interference induced by the multipath fading channel experienced by the transmitted signals.
  • the data streams are output to Digital-to-Analogue (DAC) converters 150, 152 to convert the digital data streams into analogue signals.
  • the DAC converters 150, 152 output the analogue signals for transmission by the respective transmit antennas 106, 108 over pre-determined frequency selective radio channels.
  • FIG. 2 is a schematic modular diagram of the MIMO system receiver 200.
  • Signal processing is performed for each antenna chain 202, 204 and analogue signals are received from the receive antennas 206, 208.
  • the received analogue signal from each antenna 206, 208 is converted to a digital signal by respective Analogue-to-Digital (ADC) converters 210, 212.
  • ADC Analogue-to-Digital
  • the MIMO system receiver 200 determines the start and the end of one OFDM symbol.
  • the data streams per OFDM symbol are output to cyclic prefixes removal modules 214, 216 which remove cyclic prefixes from the OFDM symbols and form data blocks of size N.
  • the data streams per block are further output to serial-to-parallel conversion modules 218, 220 to convert the data streams into a parallel format.
  • the data streams in parallel format are sent to N-point Fast Fourier transform (FFT) operations modules 222, 224.
  • the Fast Fourier Transform (FFT) operations modules 222, 224 perform N-point FFT operations on the data streams and output the resultant data streams to parallel-to-serial conversion modules 226, 228.
  • the parallel-to-serial conversion modules 226, 228 convert the data streams into a serial format.
  • the parallel-to-serial conversion modules 226, 228 are coupled to a receiver control module 229.
  • the receiver control module 229 comprises a channel estimation module 230, a MIMO detection mode selection and MIMO detection module 232, demapping modules 234, 236, deinterleaving modules 238, 240 and HARQ control modules 242, 244.
  • the parallel-to-serial conversion modules 226, 228 output the data streams to the channel estimation module 230 and the channel estimation module 230 estimates the channel fading gains using pilot signals in the data streams.
  • the estimated channel fading gains, feedback of HARQ status for each respective data stream and the received frequency domain data streams are output to the MIMO detection mode selection and MIMO detection module 232.
  • the MIMO detection mode selection and MIMO detection module 232 is used to detect the transmitted data streams from each transmit antenna.
  • the detection method is based on the MIMO transmission mode. If the SM mode is used, the VBLAST detection method can be applied and if an orthogonal STBC mode is used, a linear STBC decoding method can be applied.
  • An estimate of each transmitted data stream detected at the MIMO detection mode selection and MIMO detection module 232 is provided to the respective demapping module 234 or 236 such that an estimate of each transmission bit (i.e. each soft-bit) is provided.
  • These soft-bits are deinterleaved by the deinterleaving modules 238, 240 so that the original orders before the interleaving operation performed at the transmitter can be reconstructed.
  • These signals are then provided to the HARQ control modules 242, 244 for turbo decoding and CRC validation.
  • turbo code is used in the example implementation, the channel code may be extended to other codes (e.g. low density parity check code).
  • a turbo decoded data stream is successfully validated using the CRC validation, an ACK feedback signal is sent back to the transmitter 100 ( Figure 1) and a new data stream is then transmitted from the transmitter 100 over the corresponding transmit antenna.
  • a turbo decoded stream fails the CRC validation, a NACK feedback signal is sent back to the transmitter 100 ( Figure 1) to request for a retransmission of the data stream.
  • the ACK/NACK signals are transmitted by the receiver 200 over control channels as indicated at numeral 245.
  • the CRC validated data streams are then output as indicated at numerals 246,248 from the HARQ control modules 242, 244.
  • the feedback signals (Le. ACK/NACK) from the HARQ control modules 242, 244 are provided to the MIMO detection mode selection and MIMO detection module 232 as indicated by numerals 250, 252 for assistance in MIMO detection mode selection.
  • the feedback signals may also be provided to the HARQ control modules 242, 244 as indicated by numerals 254, 256 for assistance in channel decoding and CRC validation, e.g. the soft-bits from the deinterleaving modules 238, 240 in multiple transmissions can be combined for turbo decoding.
  • FIG 1 is based on the ACK/NACK feedback signals received at the respective transmitter buffer control module 116 or 118 ( Figure 1) from the receiver 200 via the multiple ACK/NACK receiver module 114 ( Figure 1).
  • FIGS. 3(a) and (b) below are described in relation to the transmitter buffer control module 116 only.
  • the transmitter buffer control module 118 performs in substantially the same way as the transmitter buffer control module 116.
  • FIG. 3(a) is a schematic block diagram illustrating the transmitter buffer control module 116 in a state of preparing a new data stream.
  • the transmitter buffer control module 116 receives a new data stream 304 from the data segmentation module 112 and performs the CRC attachment on the new data stream by using a CRC attachment module 306.
  • the CRC attached data stream is encoded by a channel encoder 308 where additional redundancy is provided by adding extra data bits to the input data stream.
  • Three redundancy versions (RVs) are constructed from the output of the encoder 308, i.e. RVO for the initial transmission of data stream 304, RV1 and RV2 for the retransmissions.
  • RVO contains system bits and some parity check bits while RV1 and RV2 contains different parity check bits only. As would be appreciated by a person skilled in the art, although 3 RVs are used in the example implementation, a different number of redundancy versions may be used.
  • the data of all the RVs are stored in the transmitter buffer 310 for a possible event that retransmission is requested. In the initial transmission, the data of RVO is provided to the interleaving module 120. In the retransmission, depending on the protocols (Chase combining protocol or IR protocol) used, different RVs could be extracted from the transmitter buffer 310 for processing.
  • Figure 3(b) is a schematic block diagram illustrating the transmitter buffer control module 116 in a state of preparing a retransmission data stream.
  • the transmitter buffer control module 116 activates a retransmission protocol selection module 314.
  • the retransmission protocol selection module 314 interacts with the transmitter buffer 310 to select a RV for retransmission based on a selected retransmission protocol.
  • the data of the selected RV is provided to the interleaving module 120.
  • the combination of ACK/NACK feedback signals for multiple data streams is provided to the MIMO mode selection and MIMO encoding module 132 for transmission mode selection. If initial transmissions are activated for all the data streams or if all the feedback signals are ACK, RVO of each data stream is to be transmitted and the SM mode is selected (see Figure 4(a)).
  • RV data from the transmitter buffer 310 ( Figure 3) of each data stream is selected for STBC transmission.
  • Figure 5(a) is a schematic diagram illustrating a first retransmission in a HARQ procedure.
  • an ACK signal is fed back in a data stream associated with S 1 (not shown) and a NACK signal is fed back for a data stream associated with S 2 (not shown). Since the signal associated with Si (not shown) has been successfully transmitted, a new data S 3 504 is formulated.
  • the RV1 is provided by the relevant transmitter buffer 310 and a retransmission data stream S 2 ' 502 is generated. Both S 3 504 and s 2 ' 502 are provided to the MlMO mode selection and MIMO encoding module 132 for STBC encoding.
  • Figure 5(b) is a schematic diagram illustrating a second retransmission in the
  • a second retransmission is performed if at the receiver 200 ( Figure 2), after combining S 2 ' 502 with the received signal in the initial transmission, the s 2 related data stream still fails the CRC validation and the S 3 related data stream is successfully validated, i.e. the feedback signal combination is [NACK, ACK].
  • a retransmission data stream s 2 c 506 is formulated based on the RVO from the transmitter buffer 310. When undergoing signal mapping, the In-phase portion and the Quadrature portion of the mapped symbols are swapped (i.e. IQ swapping) with respect to the initial transmission.
  • the generated data s 2 c 506 for the second retransmission and a new data stream S 4 508 are provided to the MIMO mode selection and MIMO encoding module 132 for STBC encoding which is substantially the same as the encoding in the first retransmission.
  • Figure 5(c) is a schematic diagram illustrating a third retransmission in the HARQ procedure.
  • the third retransmission is performed in a case when the decoded data associated with s 2 (not shown) fails the CRC validation after the second retransmission, i.e. the feedback signal combination is again [NACK, ACK].
  • a retransmission data stream s 2 " 510 is generated from RV2 of the transmitter buffer 310, in which the parity information is different from that in the first and second retransmissions.
  • the retransmission IR data stream S 2 510 and a new data stream s 5 512 are STBC-encoded and transmitted.
  • Figure 5(d) is a schematic diagram illustrating a fourth retransmission in the HARQ procedure.
  • the fourth retransmission is performed in a case that, after the third retransmission, the decoded data associated with s 2 is still unsuccessful.
  • a retransmission Chase data stream s 2 p 514 is generated by rotating the phase of the signal in the initial transmission based on RVO and hence no further parity check information is provided.
  • the retransmission Chase data stream s 2 p 514 and a new data stream S 6 516 from the ACK-feedback related stream are then STBC-encoded.
  • the STBC encoding is substantially the same as in the first to third retransmissions.
  • the HARQ procedure loops back to retransmit the initial data stream in STBC mode and repeats the process until either the system information is decoded successfully or a pre-determined maximum number of retransmissions (e.g. 6 rounds of retransmissions) is reached.
  • FIGS. 6(a) and (b) are schematic diagrams illustrating another HARQ procedure. It is assumed that S 1 (not shown) and s 2 (not shown) are initially transmitted and S 2 (not shown) fails the CRC validation.
  • S 2 602 and s 2 c 604 are sent to the MIMO mode selection and MIMO encoding module 132, where s 2 ' 602 and s 2 c 604 are generated in substantially the same way as S 2 ' 502 and s 2 c 506 respectively.
  • the retransmission data streams S 2 602 and s 2 c 604 and a new data stream S 3 608 are STBC-encoded by the MIMO mode selection and MIMO encoding module 132 and transmitted as one STBC block over respective antennas.
  • the STBC encoder used in this procedure is modified from the orthogonal STBC encoder shown in Figures 5(a) to (d) to transmit three different signals (ie. s 2 ' ,602, s 2 c 604 and S 3 , 608 as shown in Figure 6(a) ) rather than two signals (e.g. s 2 ' , 502 and S 3 , 504 as shown in Figure 5(a)) in one STBC block.
  • the actual transmitted signals over two antennas in the two consecutive symbol durations of one STBC block are as shown by matrix 606.
  • a retransmission IR data stream s 2 " 610 and a retransmission Chase data stream s 2 p 612 are prepared and sent to the MIMO mode selection and MIMO encoding module 132.
  • s 2 p 612 and S 2 ' 610 are generated in substantially the same way as s p 2 514 and s " 2 510, respectively.
  • the retransmission data streams s 2 " 610 and s 2 p 612 and a new data stream S 4 614 are STBC-encoded by the MIMO mode selection and MIMO encoding
  • the transmitter 100 repeats the retransmission procedure from the initial transmission until either the system information is decoded successfully or when the maximum number of retransmissions (e.g. 6 rounds of retransmissions) is reached.
  • the transmitter buffer control modules 116, 118 keep track of the number of retransmissions and select the retransmission packets according to the number of retransmissions.
  • a ML detector for detecting the new data stream S 3 is given as
  • the detection is based on all the received data streams from all receive antennas and no antenna selection is performed.
  • the MIMO detection mode selection and MIMO detection module 232 ( Figure 2) separates the multiple data streams received at the receiver 200 ( Figure 2) into respective independent transmit data streams.
  • Figures 7(a) to (c) show the MIMO detection methods according to the example implementation.
  • the detection methods are chosen based on the HARQ status feedback signals comprising ACK/NACK signals which are based on the CRC validation results of previously received data streams.
  • the MIMO detection function is to detect and separate the multiple received data streams into independent transmit data streams using detection methods, for example VBLAST or STBC detection methods.
  • the MIMO detection mode selection and MIMO detection module 232 uses a STBC detector to detect and separate the data streams, (compare Figure 4(b))
  • Figures 8(a) and (b) below are described in relation to the HARQ control module 242 only.
  • the HARQ control module 244 performs in substantially the same way as the HARQ control module 242.
  • Figure 8(a) is a schematic block diagram illustrating a state of receiving a new data stream 802 at the HARQ control module 242.
  • the HARQ control module 242 goes into this state when an ACK feedback signal 804 with respect to a previously received data stream is received as self-feedback at the HARQ control module 242.
  • the HARQ control module 242 receives the new data stream 802 from the deinterleaving module 238 ( Figure 2) and sends the new data stream 802 to the turbo decoder 806 to decode the new data stream 814.
  • the HARQ control module 242 also sends the new data stream 802 to update buffer contents of a receiver buffer 808 for an event if a future data stream combination is required.
  • the decoded data stream is output to a CRC validation module 810 for CRC validation.
  • an ACK feedback signal with regards to the new data stream 802 is sent to the transmitter 100 ( Figure 1) to acknowledge correct reception of the data stream. Otherwise, if the CRC validation is unsuccessful, a NACK feedback signal is sent to the transmitter 100 ( Figure 1) to request for a retransmission based on the data stream 802.
  • Figure 8(b) is a schematic block diagram illustrating a state of receiving a retransmission data stream 814 at the HARQ control module 242.
  • the HARQ control module 242 goes into this state when a NACK feedback signal 816 with respect to a previously received data stream is received as self-feedback at the HARQ control module 242.
  • the HARQ control module 242 receives the retransmission data stream 814 from the deinterleaving module 238 ( Figure 2).
  • the module 242 then sends the retransmitted data stream to both a retransmission packet processing module 818 and the receiver buffer 808 which stores the retransmitted data stream for an event if a future data stream combination is required.
  • the HARQ control module 242 activates the retransmission packet processing module 818 which interacts with the receiver buffer 808 to perform a combining operation.
  • the combining operation comprises extracting the relevant data from the receiver buffer 808 and combining the data with the retransmission data stream 814.
  • the output of the retransmission packet processing module 818 is sent to a turbo decoder 820 for decoding. After the turbo decoding, the turbo decoder 820 sends the decoded data stream to the CRC validation module 810 to perform CRC validation based on the decoded data stream.
  • an ACK feedback signal with regards to the retransmission data stream 814 is sent to the transmitter 100 ( Figure 1) to acknowledge correct reception of the data stream. Otherwise, if the CRC validation is unsuccessful, a NACK feedback signal is to the transmitter 100 ( Figure 1) to request for a further retransmission. From Figures 8(a) and (b), the ACK/NACK feedback signals and the data streams if the CRC validations are successful are output from the HARQ control module 242, as indicated at numeral 822. The outputs of the HARQ control modules 242, 244 are correspondingly indicated at numerals 246, 248 respectively in Figure 2. If the decoded data stream is successfully validated, it is sent from the receiver 200 ( Figure 2) for further processing (for example, upper layer processing). If a decoded data stream fails the CRC validation, it is discarded.
  • the ACK/NACK feedback signals are sent to the transmitter 100 ( Figure 1), the MIMO detection mode selection and MIMO detection module 232 ( Figure 2) and as self-feedback at the HARQ control modules 242, 244 ( Figure 2).
  • the retransmission packet processing procedure comprises detecting received data streams using the STBC detector (see Figure 7(b)) and using additional parity information from a retransmission IR data stream to assist in the decoding of system information, (compare Figure 5(a))
  • the signals from a retransmission data stream are code-combined with signals from the originally received data stream for decoding.
  • the retransmission packet processing procedure comprises using a IQ swapped retransmission Chase data stream to assist in the decoding of system information.
  • the data stream received over this retransmission is first IQ de- swapped and then combined with the originally received data stream and the data stream received in the first retransmission, (compare Figure 5(b))
  • the retransmission packet processing procedure comprises using parity information from a retransmission IR data stream containing parity information different from that of the initial data stream and retransmitted data stream in the first retransmission.
  • the data stream received over this retransmission is combined with the originally received data stream and the data streams received in the first and second retransmissions, (compare Figure 5(c))
  • the retransmission packet processing procedure comprises using a phase rotated Chase data stream to assist in the decoding of system information.
  • the data stream received over this retransmission is first phase de-rotated and then combined with the originally received data stream and the data streams received in the previous retransmissions, (compare Figure 5(d))
  • the retransmission packet processing module 818 also records the number of retransmissions and performs retransmission packet processing based on the number of retransmissions.
  • the retransmission packet processing procedure comprises detecting received data streams using the STBC detector (see Figure 7(b)), using an IQ swapped retransmission Chase data stream and using additional parity information from a retransmission IR data stream to assist in the decoding of system information, (compare Figure 6(a))
  • the received IQ swapped data stream is first IQ de- swapped and then used to combine with both the IR data stream received over this retransmission and the originally received data stream for decoding.
  • the retransmission packet processing procedure comprises using a phase rotated retransmission Chase data stream and another retransmission IR data stream to assist in the decoding of system information.
  • the received phase rotated data stream is first phase de-rotated and then used to combine with the IR data stream received over this retransmission, the originally received data stream and the data streams received in the first retransmission, (compare Figure 6(b))
  • the first or second retransmission packet processing procedure loops back to a processing based on processing the initial data stream and repeats the procedure until either the system information is decoded successfully or the pre-determined maximum number of retransmissions is reached.
  • Figure 9 is a schematic flowchart summarising the transmitting operation of the transmitter 100 ( Figure 1).
  • the transmitter decides whether or not a retransmission is performed for each transmit antenna based on the ACK/NACK feedback signals received from the receiver at step 902. If a retransmission is not performed for an antenna, at step 904, the transmitter sends a new data stream from the respective transmitter buffer control module for transmission using the antenna. At step 906, the respective transmitter buffer is updated.
  • the transmitter determines whether a retransmission IR or a retransmission Chase data stream is to be transmitted based on the number of times the previously transmitted data stream is retransmitted.
  • the transmitter prepares the retransmission IR data stream based on the data stored in the transmitter buffer. If a Chase retransmission data stream is to be transmitted at step 908, then at step 912, the transmitter prepares the retransmission
  • the transmitter determines whether the retransmission Chase data stream is to be processed by either IQ swapping or phase rotation. If IQ swapping is to be performed at step 914, then at step 916, the transmitter swaps the I and Q branch data of the previously transmitted data stream to prepare the retransmission Chase data stream. If phase rotation is to be performed at step 914, then at step 918, the phase of the previously transmitted data stream is rotated to prepare the retransmission Chase data stream.
  • the transmitter determines the transmission mode (either SM or STBC) for transmitting the current data stream for the antenna and other data streams for other antennas based on the transmission mode (either SM or STBC)
  • the data streams are transmitted using the multiple antennas.
  • the above example implementation may overcome the problem of significant corruption of parity information in the original transmission by utilising IR packets.
  • the above example implementation may overcome the problem of system information being corrupted in the original transmission by utilising Chase packets.
  • the example implementation may compensate for channel effects and may achieve retransmission diversity.
  • the MIMO system may be capable of control of the retransmission procedures based on various system requirements.
  • the above example implementation may exploit the coding gain, the retransmission diversity and space diversity of the MIMO system to achieve spectral efficiency.
  • the example implementation may improve system throughput and reduce the number of retransmissions based on utilising a combination of Chase and IR packets for retransmissions.

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

Abstract

Procédé de retransmission de données dans un système à entrées multiples sorties multiples (MIMO) consistant à utiliser une combinaison de protocole combinatoire de Chase et un protocole à redondance incrémentale (IR) pour la retransmission de données.
PCT/SG2006/000169 2006-06-23 2006-06-23 Retransmission de données dans un système à entrées multiples sorties multiples (mimo) WO2007149049A1 (fr)

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PCT/SG2006/000169 WO2007149049A1 (fr) 2006-06-23 2006-06-23 Retransmission de données dans un système à entrées multiples sorties multiples (mimo)
CNA2006800550221A CN101485133A (zh) 2006-06-23 2006-06-23 在多输入多输出（mimo）系统中的数据的重发

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