WO2012163198A1 - Mimo系统中发送数据流的方法和装置 - Google Patents

Mimo系统中发送数据流的方法和装置 Download PDF

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Publication number
WO2012163198A1
WO2012163198A1 PCT/CN2012/074497 CN2012074497W WO2012163198A1 WO 2012163198 A1 WO2012163198 A1 WO 2012163198A1 CN 2012074497 W CN2012074497 W CN 2012074497W WO 2012163198 A1 WO2012163198 A1 WO 2012163198A1
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WIPO (PCT)
Prior art keywords
data streams
layers
unit
constellation point
mapping
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Ceased
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PCT/CN2012/074497
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English (en)
French (fr)
Chinese (zh)
Inventor
花梦
王宗杰
铁晓磊
焦淑蓉
范叔炬
吴更石
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to IN1038KON2014 priority Critical patent/IN2014KN01038A/en
Priority to EP12792975.0A priority patent/EP2770657B1/en
Priority to CA2854676A priority patent/CA2854676C/en
Priority to KR1020147014293A priority patent/KR101639294B1/ko
Publication of WO2012163198A1 publication Critical patent/WO2012163198A1/zh
Priority to US14/272,870 priority patent/US9219575B2/en
Anticipated expiration legal-status Critical
Priority to US14/950,805 priority patent/US20160080029A1/en
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • 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
    • 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
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • 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
    • H04B7/0413—MIMO systems
    • 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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving
    • 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
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/7097—Direct sequence modulation interference
    • H04B2201/709709—Methods of preventing interference
    • 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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • 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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0028—Formatting
    • H04L1/0029—Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling

Definitions

  • the present invention relates to wireless communications, and more particularly to a method and apparatus for transmitting a data stream in a Multiple Input Multiple Output (MIMO) system.
  • MIMO Multiple Input Multiple Output
  • 2X 2 MIMO technology is adopted in the downlink.
  • the two antennas are respectively used to transmit a primary data stream or a primary transport block (Primary TB, Primary Transport Block) and a secondary data stream (Secondary TB, Secondary Transport Block).
  • Primary transport block is always present for the scheduled users, and whether the secondary transport block can be scheduled needs to be determined based on channel conditions.
  • the rank is at most 2, which means that up to two independent data streams can be transmitted, which corresponds to the simultaneous scheduling of the primary transport block and the secondary transport block.
  • the information corresponding to the rank of the MIMO channel space is generally referred to as the number of layers in the MIMO channel space. Obviously, in a 2X 2 MIMO system, the number of layers that can be supported is 1 or 2.
  • a transport block corresponds to a complete data block of the physical layer of the transmitting end
  • a codeword corresponds to a modulation and coding scheme (MCS).
  • MCS modulation and coding scheme
  • the codewords are independently coded and modulated.
  • each TB is mapped onto one codeword, and each codeword is mapped to one layer and then transmitted. This means that separate control signaling is required for each layer to facilitate transmission, that is, each layer corresponds to a downlink MCS selection and uplink channel quality indicator (CQI, Channel Quality Indicator) and affirmative/negative (ACK). /NACK, Acknowledge/Negative Acknowledge) Feedback.
  • CQI Channel Quality Indicator
  • ACK affirmative/negative
  • downlink communication introduces 4X4 MIMO technology, which means that the maximum number of layers that can be supported is increased to four, and there are three corresponding schemes: one, one TB corresponds to one codeword, and one codeword corresponds to one.
  • Layer ie 4TB-4CodeWord-4Layer; 2, 1 or 2 TB corresponds to 1 codeword, 1 codeword corresponds to 1 or 2 layers, S ⁇ 4TB-2CodeWord-4Layer; 3, 1 TB corresponds to 1 codeword , 1 code word corresponds to 1 or 2 layers, 2TB-2CodeWord-4Layer.
  • schemes 1 and 2 are used to replace one TB in scheme 3, and each TB corresponds to a cyclic redundancy check (CRC, Cyclic Redundancy Check).
  • CRC Cyclic Redundancy Check
  • SIC Successessive Interference Cancellation
  • embodiments of the present invention provide a method and apparatus for transmitting a data stream in a MIM0 channel space.
  • the modulation coding scheme selection of the codewords mapped to the multiple layers is guided by calculating the equivalent channel quality of the multiple layers. become possible.
  • Inter-layer interleaving enables a better adaptation of the multiple data streams that need to be transmitted to the equivalent channel quality of the feedback.
  • the equivalent CQI for the multiple layers fed back in the present invention can better reflect the overall channel quality of the multiple layers, and the inter-layer interleaving technique can be combined Reduce the signaling overhead while making full use of the channel conditions during transmission to transmit more data.
  • joint CQI can be better utilized to improve the performance of MIM0 transmission, and interference cancellation (eg, SIC technology) techniques are utilized on the basis of inter-layer interleaving to eliminate the effects of inter-layer interference.
  • interference cancellation eg, SIC technology
  • the equivalent channel quality on multiple layers of the MIM0 channel space can be fed back with the same joint CQI and the same joint ACK/NACK indication is used to feed back the correct reception of multiple data streams on these layers, by letting Mapping the data streams on these layers for inter-layer interleaving, So that: the bits of each data stream are distributed (for example, evenly distributed) to different layers, so that the receiving end can use the joint CQI feedback technology for channel quality feedback; for a part of modulation symbols included in multiple data streams (for example, Most modulation symbols) or all modulation symbols, the modulation symbols on different layers at the same time (such as symbol period/symbol position) are respectively mapped from different data streams, and the bit information carried by the same modulation symbol is from the same data
  • the modulation symbols on different layers at the same time are respectively mapped from different data streams, and the bit information carried by the same modulation symbol is from the same data stream. Applies to all symbols on the layer, or only to some symbols.
  • the effect of suppressing the interlayer interference may be inferior to the interference suppressing effect in the case where all the symbols satisfy the above characteristics, and even if so, the interlayer interference can be suppressed to some extent.
  • the effect of interference suppression is generally better.
  • Embodiments of the present invention further consider that when the equivalent channel quality on multiple layers of MIMO is fed back with the same joint CQI and multiple independent ACK/NACK are used to separately receive the reception of multiple data streams on these layers. Correct or not the problem in this case.
  • the plurality of data streams are not inter-layer interleaved in the mapping of the plurality of data streams to the plurality of layers, and the data streams may have independent error probabilities.
  • Embodiments of the present invention further consider that when the equivalent channel quality on multiple layers of MIMO is fed back with the same joint CQI and multiple independent ACK/NACK are used to separately receive the reception of multiple data streams on these layers. Correct or not the problem in this case.
  • the plurality of data streams are not inter-layer interleaved in the mapping of the plurality of data streams to the plurality of layers, and the data streams may have independent error probabilities.
  • the associated control information includes respective transport block size information of the multiple data streams.
  • the multiple data streams mapped on multiple layers may be an initial data stream, a retransmitted data stream, or both an initial data stream and a retransmitted data stream.
  • the transport block size information corresponding to the initial data stream in the associated control signaling is set according to a value that is adapted to the joint CQI currently corresponding to the multiple layers, and for the retransmitted data stream, the corresponding in the associated control signal.
  • the transport block size information for the retransmitted data stream is set according to the transport block size value determined by the retransmitted data stream at the time of its initial transmission.
  • a method of transmitting a data stream in a multiple input multiple output (MIMO) system wherein each data stream is mapped onto a plurality of layers in a MIMO channel space for transmission, including Interleaving the N data streams to obtain N interleaved data streams; mapping the N interleaved data streams to N layers of the MIMO channel space; and transmitting the mapping in N layers N interleaved data streams.
  • MIMO multiple input multiple output
  • a method of transmitting a data stream in a multiple input multiple output (MIMO) system comprising: mapping a plurality of data streams to a plurality of layers in a MIMO channel space, respectively Where the plurality of layers correspond to a Joint Channel Quality Indication (CQI) from the receiver, and each of the plurality of data streams corresponds to an independent acknowledgement/denial (ACK/NACK) feedback, respectively Transmitting the plurality of data streams mapped on the plurality of layers; when the plurality of ACK/NACKs corresponding to the plurality of data streams indicate that the plurality of data streams are not all correctly received, then at the retransmission time Only the data streams that need to be retransmitted are transmitted on the plurality of layers corresponding to the one joint CQI, and no new data streams are transmitted.
  • CQI Joint Channel Quality Indication
  • ACK/NACK independent acknowledgement/denial
  • An embodiment of the present invention provides a method for transmitting a data stream in a multiple input multiple output (MIMO) system, the method comprising: mapping a plurality of data streams to multiple layers in a MIMO channel space, Wherein the plurality of layers correspond to a joint channel quality indicator (CQI) from a receiver, and each of the plurality of data streams respectively corresponds to an independent acknowledgement/denial (ACK/NACK) feedback; Transmitting the plurality of data streams mapped on the plurality of layers and the associated control signaling corresponding to the plurality of data streams, the associated control signaling including each of the plurality of data streams Transfer block size information.
  • MIMO multiple input multiple output
  • an apparatus for transmitting a data stream in a multiple input multiple output (MIMO) system wherein each data stream is mapped to a plurality of layers in a MIMO channel space for transmission
  • the apparatus includes: an interleaving unit, configured to perform inter-layer interleaving on the N data streams to obtain N interleaved data streams; and a mapping unit, configured to map the N interleaved data streams to the N in the MIMO channel space respectively And a sending unit, configured to send the N interleaved data streams mapped on the N layers.
  • an apparatus for transmitting a data stream in a multiple input multiple output (MIM0) system comprising: a mapping unit, configured to map a plurality of data streams respectively in a MIMO channel space And a plurality of layers, wherein the plurality of layers correspond to a joint channel quality indicator (CQI) from a receiver, and each of the plurality of data streams respectively corresponds to an independent acknowledgement/denial (ACK) And a sending unit, configured to send the plurality of data streams mapped on the multiple layers; wherein, when the multiple ACK/NACK corresponding to the multiple data streams indicates that the multiple data streams are not When all are correctly received, the transmitting unit transmits only the data stream that needs to be retransmitted on the multiple layers corresponding to the one joint CQI at the retransmission time, without transmitting a new data stream.
  • a mapping unit configured to map a plurality of data streams respectively in a MIMO channel space And a plurality of layers, wherein the plurality of layers correspond to a joint channel quality indicator (
  • an apparatus for transmitting a data stream in a multiple input multiple output (MIMO) system comprising: a mapping unit, configured to separately map a plurality of data streams in a MIMO channel space And a plurality of layers, wherein the plurality of layers correspond to a joint channel quality indicator (CQI) from the receiver, and each of the plurality of data streams respectively corresponds to an independent acknowledgement/deny (ACK/NACK), a sending unit, configured to send the plurality of data streams mapped on the multiple layers and the associated control signaling corresponding to the multiple data streams, where the associated control signaling includes Transmit block size information for each of the plurality of data streams.
  • a mapping unit configured to separately map a plurality of data streams in a MIMO channel space And a plurality of layers, wherein the plurality of layers correspond to a joint channel quality indicator (CQI) from the receiver, and each of the plurality of data streams respectively corresponds to an independent acknowledgement/deny (ACK/NACK)
  • ACK/NACK independent acknowledgement/
  • an apparatus for transmitting a data stream in a MIMO system comprising a processor and Connected to the memory, the processor is configured to: perform inter-layer interleaving on the N data streams to obtain N interleaved data streams; and map the N interleaved data streams to N in the MIMO channel space respectively Layers; transmitting the N interleaved data streams mapped on the N layers.
  • an apparatus for transmitting a data stream in a MIMO system comprising a processor and a memory coupled thereto, the processor configured to: map the plurality of data streams separately Multiple layers in a MIMO channel space, wherein the plurality of layers correspond to a joint CQI from a receiver and each of the plurality of data streams respectively corresponds to a separate ACK from the receiver NACK feedback; transmitting the plurality of data streams mapped on the plurality of layers; when a plurality of ACK/NACKs corresponding to the plurality of data streams indicate that the plurality of data streams are not all correctly received, retransmitting At the moment, only the data streams that need to be retransmitted are transmitted on the plurality of layers corresponding to the one joint CQI, and no new data streams are transmitted.
  • an apparatus for transmitting a data stream in a MIM0 system comprising a processor and a memory coupled thereto, the processor configured to: map the plurality of data streams separately a plurality of layers in a MIMO channel space, wherein the plurality of layers correspond to a joint channel quality indicator (CQI) from a receiver, and each of the plurality of data streams corresponds to an independent one Acknowledgement/denial (ACK/NACK) feedback; transmitting the plurality of data streams mapped on the plurality of layers and associated control signaling corresponding to the plurality of data streams, the associated control signaling comprising the Transport block size information for each of the multiple data streams.
  • CQI joint channel quality indicator
  • ACK/NACK Acknowledgement/denial
  • an apparatus for transmitting a data stream in a MIMO system comprising: a memory for storing executable instructions; and a processor for executing the above embodiment according to the executable instructions method.
  • a machine readable medium wherein instructions are stored that, when executed by a machine, enable the machine to perform the methods of the above-described embodiments.
  • Figure 1 shows a general structural schematic of a data stream transmitted in MIMO mode in a 4 X4 MIMO system.
  • FIG. 2 is a schematic flow chart of a method of transmitting multiple data streams in a MIMO system according to an embodiment of the present invention.
  • FIG. 3 is a schematic flow chart of a method of transmitting multiple data streams in a MIMO system according to an embodiment of the present invention.
  • FIG. 4 is a method of transmitting multiple data streams in a MIMO system according to an embodiment of the present invention. Schematic flow chart.
  • FIG. 5 is a schematic flow chart of a method of transmitting multiple data streams in a MIMO system according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of implementing bit collection in accordance with an embodiment of the present invention.
  • FIG. 7 is a schematic flow chart of a method of transmitting multiple data streams in a MIMO system according to an embodiment of the present invention.
  • FIG. 8 is a schematic flow chart of a method of transmitting multiple data streams in a MIMO system according to an embodiment of the present invention.
  • FIG. 9 is a schematic flow chart of a method of transmitting multiple data streams in a MIMO system according to an embodiment of the present invention.
  • FIG. 10 is a schematic flow diagram of an overall method of transmitting multiple data streams in a MIMO system in accordance with an embodiment of the present invention.
  • FIG. 11 is a schematic flow diagram of an overall method of transmitting multiple data streams in a MIMO system in accordance with an embodiment of the present invention.
  • 11A is a schematic flow diagram of a general method of transmitting multiple data streams in a MIMO system, in accordance with an embodiment of the present invention.
  • Figure 12A is a schematic diagram of an apparatus for transmitting a data stream in a MIMO system in accordance with an embodiment of the present invention.
  • Figure 12B is a schematic diagram of an apparatus for transmitting a data stream in a MIMO system in accordance with an embodiment of the present invention.
  • Figure 13A is a schematic diagram of an apparatus for transmitting a data stream in a MIMO system in accordance with an embodiment of the present invention.
  • Figure 13B is a schematic diagram of an apparatus for transmitting a data stream in a MIMO system in accordance with an embodiment of the present invention.
  • FIG. 14 is a diagram of a wireless device that transmits a data stream in a MIMO system in accordance with an embodiment of the present invention.
  • FIG. 1 is a schematic diagram showing a general structure of transmitting a data stream in a MIMO manner through four transmitting antennas in a 4 ⁇ 4 MIMO system.
  • two transport channel processing units 1 and 2 process two data streams 1, 2 and 3, 4, respectively, and four data streams after transport channel processing.
  • the spreading/scrambling processing is performed separately, and then pre-encoded by multiplying the encoding coefficient W y , and then added to the common pilot channel (CPICH, Common Pilot Channel), and finally transmitted through multiple antennas.
  • the multiple parallel lines in the figure represent multiple code channels or channels, and different code channels are multiplied by different spreading codes during the spreading operation.
  • the method can be used to divide four data streams into one layer for inter-layer interleaving in a four-antenna transmission structure of a 4 X4 MIMO system, and eight or sixteen antennas in a future 8 X 8 or 16 X 16 MIMO system.
  • every two data streams, every four data streams, and even every eight data streams are grouped into one layer for inter-layer interleaving, so the method of two data streams 1, 2 described in the embodiment can be easily adopted. Expanded to achieve for any number of N data streams.
  • TBI and TB2 may be the first and second data streams or the third and fourth data streams in the four-antenna transmission structure of the 4 ⁇ 4 MIMO system shown in FIG. 1; those skilled in the art should understand that The same processing is performed on the other two data streams.
  • the same joint CQI information can be more effectively used to feed back the channel quality of the two layers corresponding to the two data streams in the MIMO channel space. Further The same joint ACK/NACK can be used to feed back whether the two data streams are successfully received.
  • the method shown in Figure 2 includes the following processing.
  • the two TBs are respectively bit-scrambled, that is, each bit of the bit stream corresponding to each TB is modulo-added with a predetermined scrambling code bit, and the predetermined scrambling code bits are known by the transmitting end and the receiving end.
  • the purpose of this operation is to avoid the occurrence of multiple consecutive '0's in the transmission, thus reducing transmission and reception errors.
  • the code blocks are separately divided into two code blocks to obtain a plurality of code blocks. Since the maximum length of the channel encoder is limited in a specific communication system, for example, the maximum length of the UMTS Turbo encoder is 5114 bits. The maximum length of the Turbo encoder of the LTE system is 6144 bits, and the length of the data stream to be encoded may exceed the maximum length, and the code block division is performed to ensure that the length of each coding block does not exceed the maximum length of the encoder.
  • channel coding is performed on a plurality of coding blocks obtained from two TB divisions, such as convolutional coding or turbo coding, in order to increase redundant information and help the receiving end to combat channel interference and noise.
  • a HARQ (Hybrid Automatic Repeat Request) function operation is performed on the two coded codewords.
  • the size of the physical resource of the air interface for transmitting the TB is not necessarily the same as the size of the output data stream of the S24.
  • the size relationship between the two is not equal.
  • the operation of repeating or puncturing is used to match the output data stream of the S24 to the real air interface. Physical resources are guaranteed to be sent.
  • the physical layer HARQ operation is to repeat or punctify according to certain rules.
  • the influencing factors include: the ratio of the output data stream size of the S24 to the physical resource size of the air interface, whether the data belongs to the system bit or the check digit in the S24 output. Whether the secondary transmission is initial transmission or retransmission, and what kind of constellation point mapping method is used for this transmission.
  • the UMTS system is a code division multiple access system.
  • the air interface physical resources may correspond to a single code channel or multiple code channels.
  • the output of the S25 will be mapped to multiple code channels in S29.
  • the output data stream of S25 is divided according to the size of the single code channel resource, and a plurality of sub data streams are output, and each sub data stream corresponds to a resource of a single code channel in the subsequent S29.
  • channel as used herein may refer to a single code channel or multiple code channels, but may also refer to other types of channels in other, for example, frequency division multiple access, time division multiple access systems.
  • the invention can also be applied to other types of systems System.
  • high-speed downlink shared channel (HS-DSCH, High Speed Downlink Shared Channel) interleaving is performed on the two codewords respectively, that is, inter-coded interleaving, and each sub-data stream output to S26 (corresponding to a single code channel)
  • the purpose of interleaving is to discretize a long burst error into a random error to facilitate error correction in channel decoding.
  • constellation point arrangement or constellation point re-arrangement is performed on the two codewords respectively.
  • high-order modulation such as 16QAM and 64QAM
  • the robustness of multiple bits corresponding to each constellation point is different.
  • the same bits can be mapped differently at each constellation point during initial transmission and retransmission, thereby improving the correct reception probability at the time of retransmission.
  • two codewords are respectively interleaved (e.g., bit-level interleaved) to obtain an interleaved sequence ⁇
  • TBI and TB2 correspond to two layers in the MIMO channel space.
  • the interleaving result is mapped onto two layers.
  • constellation point mapping or modulation is performed on the two interleaved codewords mapped to the two layers, respectively.
  • the modulated constellation point symbol is transmitted.
  • the constellation point symbols are transmitted on the MIMO channel by performing operations such as spreading scrambling and precoding on constellation point symbols mapped on the two layers.
  • two TB modulation symbols are interleaved and distributed over two layers of the MIMO channel space.
  • each TB corresponds to one codeword.
  • two codewords mapped on the same code channel are inter-TB interleaved, and then the interleaving results are respectively mapped to two layers.
  • the role of the interleaver is such that data from the same TB can be distributed (eg, evenly distributed) to two layers, such that the joint CQI corresponding to the two layers can better feed back the channel quality experienced by the data stream, and at the same time (eg, The same symbol period/symbol position)
  • the data on the two layers of the same code channel comes from two TBs, so that the receiving end can perform interference cancellation (for example, SIC) operation for the two layers.
  • interference cancellation for example, SIC
  • the value of P is determined according to the constellation point mapping, that is, the modulation mode.
  • the value of P is taken as a multiple of 2 in QPSK modulation, and the value of P is taken as a multiple of 4 in 16QAM modulation, in 64QAM modulation.
  • the value of P is taken as a multiple of 6.
  • the matrix A' is: ai a 2 a 2 l -l)P+ll -l)P+2 ... 1
  • the matrix A' is ai, i a i & 1, ⁇ a 2 a 2 a 2, a 2 -l) P + l a 2 - l) P + 2 ... ⁇ 2 a2, l & 2 a ⁇ a, a, a i, : a i -l)P+l a i -l)P+2 ... a i
  • the data in the matrix A' is read out again in rows, and the obtained two new sequences 1 and 2 after interleaving are Q when the odd number is
  • Sequence 1 a u , a 12 ,... a lp , a 2P+1 , a 2P+2 ,... , a 22P ,... , +1 , ⁇ _ ⁇ ⁇ +2 ,... , a i
  • ⁇ ij 1 a u , a 1 2 ,... a lp , a 2 P+1 , a 2 P+2 ,..., a 2 2P ,..., ⁇ 2 ,(QI)P+I , A 2,( Qi)p+2,..., 3 ⁇ 4,M
  • sequence 1 can be mapped to layer 1
  • sequence 2 is mapped to layer 2
  • constellation point mapping modulation can be performed on the mapped two channels of data, respectively.
  • the modulation symbols of the same TB are distributed on multiple layers, so that the presence of the modulation symbols on the high quality layer can improve the same TB in the decoding process.
  • the probability of successful decoding of modulation symbols on the low quality layer; by the above interleaving and mapping, the symbols on each layer are from multiple TBs and at the same time (eg, at symbol positions) the symbols on multiple layers of the same channel are respectively from Different TBs allow the receiver to perform effective interference cancellation (eg, SIC reception), thereby eliminating inter-layer interference well in MIMO receiver algorithms.
  • TBI and TB2 may be the first and second data streams or the third and fourth data streams in the four-antenna transmission structure of the 4 ⁇ 4 MIMO system shown in FIG. 1; those skilled in the art should understand that The same processing is performed on the other two data streams.
  • the same joint CQI information can be used to feed back the channel quality of the two layers corresponding to the two data streams in the MIMO channel space.
  • the same joint ACK/NACK can be used to feed back whether the two data streams are successfully received.
  • the method shown in Figure 3 includes the following processing.
  • the two TBs are bit-scrambled separately.
  • code segmentation is performed on two TBs to obtain a plurality of coded blocks.
  • channel coding is performed on a plurality of coding blocks obtained from the two TB divisions, respectively.
  • constellation point mapping is performed on the two codewords mapped by the physical channel, that is, the constellation point symbols are generated by modulation.
  • inter-layer interleaving i.e., interleaving between symbol streams
  • interleaving between symbol streams is performed on the two constellation point symbol streams obtained by the modulation, respectively, to obtain an interleaved symbol stream.
  • the interleaved symbol streams are mapped onto two layers.
  • the constellation point symbols mapped to the two layers are transmitted, SP, and the modulation symbols of the two TBs are distributed and transmitted on two layers of the MIMO channel space.
  • the steps S31-S310 of the embodiment of Fig. 3 are substantially the same as the steps S21-S29, S212 of the embodiment of Fig. 2 described above, and therefore will not be further described.
  • the embodiment of FIG. 3 first maps each codeword into a constellation symbol and then interleaves and maps to a layer, and FIG. 2 first interleaves and maps to a layer, and then maps The result is modulated to obtain constellation point symbols, so the interleaving in Figure 2 uses bit-level interleaving, while Figure 3 uses symbol-level interleaving.
  • the value of P is not limited and can be taken. Take the whole transportation;
  • the matrix A' is: l,(Q-l)P+l "(Q- l)P+2
  • the Q1 group reads out and maps the symbols of the first row in the matrix A' onto the layer 1, and reads and maps the symbols of the second row in A' onto the layer 2.
  • FIG. 4 is a schematic flow chart of a method of transmitting multiple data streams in a MIMO system according to an embodiment of the present invention.
  • the same joint CQI information can be used to feed back the channel quality of the two layers corresponding to the two data streams in the MIMO channel space.
  • the same joint ACK/NACK can be used to feed back whether the two data streams are successfully received.
  • This embodiment is similar to the embodiment of Figure 2, except that the bit-level inter-layer interleaving and layer mapping locations are placed between the physical layer HARQ functional operation and the physical channel allocation operation.
  • the method shown in Figure 4 includes the following processing.
  • the two TBs are bit-scrambled separately.
  • code segmentation is performed on two TBs to obtain a plurality of coded blocks.
  • channel coding is performed on a plurality of coding blocks obtained from the two TB divisions, respectively.
  • physical layer HARQ function operations are performed on the two coded codewords, respectively.
  • inter-layer interleaving (interleaving between codewords) on the codewords operated by the HARQ function is performed to obtain two interleaved codewords.
  • the two codewords after interleaving are mapped to two layers, respectively.
  • HS-DSCH interleaving is performed on the two interleaved codewords allocated through the physical code channel.
  • constellation points are arranged for the two interleaved codewords after the HS-DSCH interleaving.
  • physical channel mapping is performed on the two interleaved codewords arranged by the constellation points.
  • constellation point mapping is performed on the two interleaved codewords mapped by the physical channel, that is, the constellation point symbols are generated by modulation.
  • the constellation point symbols mapped to the two layers are transmitted, SP, and the modulation symbols of the two TBs are distributed and transmitted on two layers of the MIMO channel space.
  • the interleaving operation employed in the embodiment of Fig. 4 is similar to the interleaving method described above with respect to the embodiment of Fig. 2, except that the selection of the P value is different.
  • the value of P is also determined according to the manner of constellation point mapping. For example, the value of P is taken as a multiple of 2 ⁇ 480 in QPSK modulation, and the value of P is taken as 4 ⁇ 480 in 16QAM modulation. In multiples, the value of P is taken as a multiple of 6 X 480 during 64QAM modulation.
  • the odd arrays of the matrix A are row-replaced.
  • the interleaved matrix A' may be obtained by performing row permutation on each even array of the matrix A, and may also be through any group in the matrix A. Row permutation is performed to achieve interleaving.
  • N data streams are inter-layer interleaved.
  • M data eg, bits or symbols
  • N data streams eg, N TBs
  • NXM matrix A of NXM
  • Each P column is divided into a group of Q p I groups; the Q components are grouped into N sets; the N sets are respectively subjected to row permutation to generate an interleaving matrix A', and N rows of the matrix A' are respectively N
  • the interleaved data streams are mapped to the corresponding N layers.
  • the N sets may be different. Line replacement.
  • the bits from each of the N data streams are evenly distributed to the N layers by performing inter-layer interleaving and layer mapping on the N data streams.
  • N modulation symbols on the N layers of the same channel at the same time are respectively derived from ( Mapping from different data streams in the N data streams is in accordance with the principles of the present invention.
  • each TB corresponds to one codeword
  • the following embodiment is directed to an application scenario in which two TBs correspond to one codeword.
  • FIG. 5 is a schematic flow chart of a method of transmitting multiple data streams in a MIMO system according to an embodiment of the present invention. The method includes the following operations.
  • the two TBs are cascaded to form one codeword.
  • bit distortion is performed on the formed codeword.
  • the bit-scrambled codeword is code block-divided to obtain a plurality of coded blocks.
  • the number of coded blocks after division may be selected to be an even number, but not necessarily, so that the bit information in each code block is from the same TB.
  • TB is a data stream unit for transmitting a channel to a physical channel;
  • a codeword is a unit of data stream for performing channel coding, rate matching, etc., respectively, but the concept of the codeword starts from which operation step to which operation step ends, the current protocol There is no specific provision in it;
  • Code Block is a data stream single for turbo coding. Bit.
  • one TB may correspond to one codeword, or two TBs may be cascaded to correspond to one codeword; one codeword may be divided into one or more coding blocks according to its actual size. Channel coding.
  • channel coding is performed on the plurality of coded blocks obtained by the segmentation.
  • a physical layer HARQ operation is performed on the channel-coded plurality of coded blocks. After the encoding is completed, multiple coding blocks are connected in series to enter the physical layer HARQ operation module.
  • Physical layer HARQ operations may include: Bit Separation, Rate Matching, and Bit Collection. The bit separation is to divide the output of the channel encoder (for example, turbo encoder) into three channels according to the system bit, the first parity bit and the second parity bit; the rate matching is according to the output data stream size of S55 and the physical resource size of the air interface.
  • the ratio repeats or punctifies the three-way data separated by bits; the bit collection is to divide the three channels of data after matching (corresponding to the system bit, the first parity bit and the second parity bit respectively) and then arrange them according to a predetermined rule. Output.
  • the codewords operated by the physical layer HARQ function are inter-code interleaved.
  • the interleaved codewords are mapped onto two layers, resulting in two interleaved data streams mapped on the two layers.
  • HS-DSCH interleaving is performed on the two interleaved data streams respectively.
  • constellation points are arranged on the two interleaved data streams respectively.
  • constellation point mapping is performed on the two interleaved data streams respectively.
  • the modulated constellation point symbol is transmitted, and SP, two TB modulation symbols are interleaved and distributed on two layers of the MIMO channel space for transmission.
  • a ⁇ can be used in the bit collection.
  • N P N . N t N ⁇ ⁇
  • the symbol L ′′ indicates that the number of system bits to be transmitted after i s sys indicates that the code is punctured is taken down.
  • ⁇ is an even number
  • ⁇ ⁇ is the total number of system bits from two TBs, and the two TBs are the same size, ie ⁇ ⁇ is also an even number, so N. Also for even numbers.
  • the rate matched system bit portion, the first check bit portion, and the second check bit portion are placed in an interleaver for bit collection in the manner shown in FIG.
  • the system bits are placed column by column in a column labeled 1 and the first check bit sequence and the second check sequence are interleaved in a column-by-column order by column.
  • the square of the check digit is the first bit of the second parity sequence.
  • the check bit area includes N x N
  • the system bits in the data stream of the rate matching output are placed column by column in the system bit region, starting with the first bit of the second parity bit portion, and the second check is performed.
  • the bits in the bit portion and the bits in the first parity bit portion are alternately placed column by column
  • the bits in the matrix are read out column by column to obtain a data stream that has been operated by the HARQ function.
  • the codeword sequence is obtained by reading the bits in the matrix of Fig. 6 column by column.
  • An a NJ -a N data sets the columns of the matrix A into a group per U column, where U is the number of bits that can be carried per code channel corresponding to a specific modulation mode, which is determined according to the modulation mode used. Specifically, when the modulation mode is QPSK, U is a multiple of 960; when the modulation mode is 16QAM, U is a multiple of 1920; modulation
  • the number is 01" ⁇ ⁇ _1, that is, the matrix ⁇ can be expressed as:
  • the first row of matrix A' is mapped to the first layer and the second row is mapped to the second layer.
  • bit collection process is not performed in the above-described Fig. 6 in S56, but a conventional bit collection method can be employed. In this embodiment, it can be implemented in other ways.
  • FIG. 7 is a schematic flow chart of a method for transmitting multiple data streams in a MIMO system according to an embodiment of the present invention. The method includes the following process.
  • the two TBs are cascaded to form one codeword.
  • the formed codeword is bit-scrambled.
  • code bit segmentation is performed on the bit-scrambled codeword to obtain a plurality of coded blocks.
  • the number of coded blocks after division may be selected to be an even number, but not necessarily, so that the bit information in each code block is from the same TB.
  • channel coding is performed on the obtained plurality of coding blocks.
  • physical layer HARQ function operations are performed on the channel-coded plurality of coded blocks.
  • the HARQ function operates to output a codeword sequence ai ' a2 ''''' a .
  • the codeword obtained after the HARQ function operation is split onto two layers. For example, The first / 2 bits of the codeword sequence ai , a2 , ' , a
  • constellation points are arranged on the two data streams respectively.
  • constellation point mapping is performed on the data streams mapped by the two physical channels respectively, that is, two constellation point symbol streams are generated by modulation.
  • inter-layer inter-layer interleaving is performed on the generated two constellation point symbol streams to obtain two interleaved constellation point symbol streams.
  • the two interleaved constellation point symbol streams are mapped to the two layers, respectively.
  • the constellation point symbols mapped on the two layers are transmitted.
  • the modulated symbols on the two layers are:
  • the symbol sequence on layer one is ⁇
  • the symbol on layer two The sequence is ⁇ , ⁇ , .
  • the first line of ⁇ ' is used as the first layer of the code track to perform subsequent spreading, precoding, etc. for transmission, and the second line is used as the second line of the code channel.
  • the symbols finally transmitted by the layer perform subsequent spreading, precoding, and the like for transmission.
  • the implementation of the S56 can be performed in the same manner as the implementation S56 described above, using the method shown in FIG. 6 described above.
  • the bit collection process is not performed in the above-described method of FIG. 6 in S76, but a conventional bit collection method may be employed. In this embodiment, it can be implemented in other ways.
  • Layer splitting in S77 For example, when the sequence ai ' a2 ' - a is placed in a 2X matrix by row, the corresponding sequence parts are placed in reverse order when the second row is placed, and the matrix A is obtained. The two rows in matrix A can then be mapped to two layers, respectively. It should be understood by those skilled in the art that in the case of layer splitting N data streams and not limited to two data streams, the sequence output by S76 is divided into N rows, and for odd rows or even rows, the data in the row is followed.
  • FIG. 8 is a schematic flow chart of a method for transmitting multiple data streams in a MIMO system according to an embodiment of the present invention.
  • the same joint CQI information may be used to feed back the channel quality of the two layers corresponding to the two data streams in the MIMO channel space, and two independent ACK/NACKs may be used to feed back whether the two data streams are fed back. Received successfully.
  • the method shown in Fig. 8 includes the following processing.
  • the two TBs are bit-scrambled separately.
  • code segmentation is performed on two TBs to obtain a plurality of coded blocks.
  • channel coding is performed on a plurality of coding blocks obtained from the two TB divisions, respectively.
  • HS-DSCH interleaving is performed on the two codewords allocated through the physical code channel.
  • constellation points are arranged for the two codewords interleaved by the HS-DSCH.
  • physical channel mapping is performed on the two codewords arranged by the constellation points.
  • constellation point mapping is performed on the two codewords mapped by the physical channel, that is, the constellation point symbols are generated by modulation.
  • the two constellation point symbols obtained by the modulation are mapped onto two layers.
  • the constellation point symbols mapped to the two layers are transmitted, SP, and the modulation symbols of the two TBs are respectively distributed and transmitted on two layers of the MIMO channel space.
  • the steps S81-S812 of the embodiment of the present invention are substantially the same as the steps S31-S310 and S312-S313 of the embodiment of Fig. 3 described above, and therefore will not be further described.
  • the two data streams using the same joint CQI are not inter-layer interleaved but the two data streams (codewords) are directly mapped onto the two layers.
  • two TBs correspond to the same CQI and respectively correspond to respective ACK/NACKs, so that there is an independent error probability between the two data streams.
  • the inventors have recognized that in order to reduce the overhead of the associated control signaling, the TB size information field in the associated control channel generally only feeds back one TB size information for each CQI.
  • the retransmission mechanism is greatly affected. If another new TB block is scheduled to be transmitted together while retransmitting the unsuccessful TB, corresponding to the two TB blocks, only one TB size information field is available on the associated control channel, and the retransmission block is expected to be associated with the control.
  • the TB size information field on the channel is set to the corresponding TB size at the time of initial transmission, and the new scheduling block wants the TB size information field on the associated control channel to be set according to the current CQI feedback value. Contradictions arise when the values of the above two TB sizes are not equal. If the TB size information field on the associated control channel corresponding to the two TB blocks is set to the TB size of the retransmission block, and the new scheduling block is also scheduled according to the TB size, the TB size and the size of the new scheduling block are caused.
  • CQI channel quality
  • a targeted retransmission strategy is proposed in this embodiment, that is, a new transmission is not allowed in the corresponding two layers at the retransmission time of retransmitting the TB that was last unsuccessful.
  • the retransmission time transmits only the data stream that needs to be retransmitted on multiple layers corresponding to the joint CQI, and does not transmit the new data stream.
  • two TBs are mapped to two layers corresponding to the same joint CQI, and respectively correspond to respective ACK/NACKs.
  • the associated control signaling is also transmitted, and the associated control signaling includes the respective transport block size information of the two TBs.
  • the associated control signaling may include a transport block size information field for carrying transport block size information for each of the two TBs.
  • both TBs are initial transmission blocks
  • the transmission block sizes of the two TBs depend on a corresponding joint CQI, that is, the receiving end feedbacks for the previous transmission on the two layers.
  • Joint CQI for example, processing two TBs to be mapped to the two layers according to a joint CQI corresponding to two layers fed back by the receiving end, so that the transport block sizes of the two TBs are adapted to the corresponding joint CQI.
  • both TBs are initial transport blocks
  • the transport block sizes of the two TBs are the same, and the transport block size information of the two TBs included in the associated control signaling has the same value.
  • the transport block sizes of the two TBs may be different.
  • the transport block size values mapped to the two TBs on the two layers contained in the road control signaling may be different.
  • the transport block size value of the initial transport block included in the associated control signaling is Adapted to the corresponding joint CQI to set; for the retransmission block, the transport block size value of the retransmission block included in the associated control signaling is set according to the transport block size value determined by the retransmission block at the time of its initial transmission. set.
  • every two layers correspond to one joint CQI
  • four layers correspond to two Joint CQI
  • the block size information or the number of transport block size information fields is proportionally increased.
  • the description is made by taking two layers corresponding to one joint CQI (or two data streams corresponding to one joint CQI) as an example, but the embodiment can be applied to any The number of layers or data streams corresponds to the case of a joint CQI.
  • the plurality of layers corresponding to the CQI may include transport block size information of the plurality of data streams in the associated control signaling sent together with the plurality of data streams mapped to the multiple layers, for example, the path
  • the control signaling includes the same number of transport block size information fields as the number of the plurality of data streams, for respectively carrying transport block size values of each of the plurality of data streams.
  • the number of transport block size information contained in the associated control signaling increases proportionally with the number of joint CQIs.
  • the transport block size information of the plurality of data streams included in the associated control signaling has the same value.
  • the transport block size value is adapted to the corresponding joint CQI value.
  • the retransmission time of the data stream that is not correctly received is retransmitted on the multiple layers (eg, retransmission)
  • the transport block size values of the plurality of data streams mapped to the multiple layers included in the associated control signaling may be different.
  • the data stream mapped to the multiple layers may include only the retransmission block, and may also include both the retransmission block and the newly scheduled initial transmission block.
  • the transport block size information of the initial transport block included is set according to a value adapted to the corresponding joint CQI; for the retransmission block, the transport block size information of the retransmission block included in the associated control signaling is according to the retransmission The block is set at the value of the transport block size determined at the time of its initial transmission.
  • FIG. 9 is a schematic flow chart of a method of transmitting multiple data streams in a MIMO system according to an embodiment of the present invention.
  • the same joint CQI information is used to feed back channel quality of two layers corresponding to the two TBs in the MIMO channel space, and two independent ACK/NACK are adopted. To feedback whether two TBs are successfully received.
  • the method shown in Figure 9 includes the following processing.
  • the two TBs are cascaded to form a codeword.
  • the formed codeword is bit-scrambled.
  • code bit segmentation is performed on the bit-scrambled codeword to obtain a plurality of coded blocks.
  • channel coding is performed on the obtained plurality of coding blocks.
  • a physical layer HARQ function operation is performed on the channel coded plurality of coding blocks.
  • the codeword obtained after the operation of the HARQ function is mapped to two layers.
  • physical channel allocation or physical physics is respectively performed on two data streams mapped on two layers. Code channel allocation.
  • constellation points are arranged on the two data streams respectively.
  • constellation point mapping is performed on the data streams mapped by the two physical channels respectively, that is, two constellation point symbol streams are generated by modulation.
  • the generated constellation point symbols mapped on the two layers are transmitted.
  • steps S91-S913 of the embodiment of Fig. 9 are substantially the same as the steps S71-S712, S715 of the above-described embodiment of Fig. 7, and therefore will not be further described.
  • two data streams using the same joint CQI are not inter-layer interleaved, but the two data streams are directly mapped onto two layers for transmission.
  • the retransmission of the last unsuccessful TB is not allowed to be performed at the corresponding two layers.
  • the data streams corresponding to the same joint CQI are not correctly received, only the data streams that need to be retransmitted are transmitted on the multiple layers corresponding to the joint CQI at the time of retransmission, without performing new data. The transmission of the stream.
  • the transport block size information of the two TBs is included in the associated control signaling transmitted together when transmitting the two TBs respectively mapped to the two layers.
  • the transport block size of the two TBs depends on the current joint CQI corresponding to the two layers.
  • the transport block sizes of the two TBs may be different. For example, when two TBs transmitted on two layers corresponding to the same joint CQI are not all correctly received, two TBs mapped to two layers may be at the retransmission time of the TB that is not correctly received.
  • the transport block size value of the initial transport block included in the associated control signaling is adapted to the corresponding
  • the joint CQI is set, and for the retransmission block, the transport block size value of the retransmission block included in the associated control signaling is set according to the transport block size value determined by the retransmission block at the time of its initial transmission.
  • Data streams correspond to a joint CQI and a union
  • ACK/NACK multiple data streams are inter-layer interleaved by the interleaving scheme provided by the present invention, and then mapped to different layers for transmission, so that each data stream distribution (for example, average or near-average distribution) is different.
  • a joint CQI reflecting the equivalent quality of the multiple layers can be obtained so that the channel conditions can be fully utilized, and the symbols on different layers of the same channel at the same time (eg, symbol period/symbol position) are from different data streams, and The same symbol is guaranteed to be from the same data stream as much as possible, so that inter-layer interference cancellation (such as SIC reception) can be performed more effectively, and inter-stream interference is minimized.
  • inter-layer interference cancellation such as SIC reception
  • the error probability proposes the retransmission strategy at this time - the retransmission of the last unsuccessful TB retransmission is not allowed to perform new transmissions at the corresponding two layers, saving signaling overhead while avoiding The retransmission is frozen.
  • multiple data streams correspond to one joint CQI and each corresponds to an independent ACK/NACK
  • multiple data streams are not directly interleaved and mapped to different layers for transmission, so that the data streams are There may be independent error probabilities, and the associated block size information of the multiple data streams is included in the associated control signaling sent with multiple data streams, thereby facilitating the initial transmission with higher efficiency. Retransmission.
  • Figure 10 shows a schematic flow diagram of a general method of transmitting multiple data streams in a MIMO system in accordance with an embodiment of the present invention, where each data stream will be mapped onto multiple layers in a MIMO channel space for transmission.
  • N data streams are inter-layer interleaved to obtain N interleaved data streams
  • N interleaved data streams are respectively mapped to N in the MIMO channel space.
  • N interleaved data streams mapped on N layers are transmitted.
  • N can be any integer greater than one.
  • the process of inter-layer interleaving the N data streams is such that the bit distribution of each of the N data streams (eg, averaged or nearly evenly distributed) onto different layers of the N layers, the same
  • the modulation symbols at the same time ie, symbol period/symbol position
  • the method illustrated in Figure 10 may further include one or more of the processes described above in connection with Figures 2-7.
  • FIG. 11 shows a schematic flow diagram of an overall method of transmitting multiple data streams in a MIMO system in accordance with an embodiment of the present invention.
  • a plurality of data streams are respectively mapped on a plurality of layers in a MIMO channel space, wherein the plurality of layers correspond to a joint from a receiver CQI and each of the plurality of data streams respectively corresponds to an independent ACK/NACK feedback;
  • S112 transmitting the plurality of data streams mapped on the plurality of layers; and in S113, when When multiple ACK/NACKs corresponding to the data stream indicate that all of the multiple data streams are not correctly received, only the data streams that need to be retransmitted are transmitted on the multiple layers corresponding to the joint CQI at the retransmission time, instead of Transfer new data streams.
  • the method illustrated in Figure 11 may further include one or more of the processes described above in connection with Figures 8-9.
  • FIG. 11A shows a schematic flow diagram of an overall method of transmitting multiple data streams in a MIMO system in accordance with an embodiment of the present invention.
  • a plurality of data streams are respectively mapped on a plurality of layers in a MIMO channel space, wherein the plurality of layers correspond to a joint CQI from a receiver, and the plurality of data streams
  • Each of the data streams respectively corresponds to an independent ACK/NACK feedback
  • S112A the plurality of data streams mapped on the plurality of layers and associated control signaling corresponding to the plurality of data streams are transmitted,
  • the associated control signaling includes transport block size information for each of the plurality of data streams.
  • the plurality of data streams may include an initial transport block, and the block size information of the initial transport block included in the associated control signaling is a transport block size value determined according to a corresponding joint CQI.
  • the plurality of data streams may include a retransmission block, and the block size information of the retransmission block included in the associated control signaling is a transport block size value determined by the retransmission block at the time of its initial transmission.
  • the plurality of data streams may include both an initial transport block and a retransmission block, and the block size information of the initial transport block included in the associated control signaling is a transport block size value determined according to a corresponding joint CQI.
  • the block size information of the retransport block included in the associated control signaling is a transport block size value determined by the retransmission block when it is initially transmitted.
  • the number of transport block size information included in the associated control signaling increases proportionally with the number of the plurality of joint CQIs.
  • Figure 11A may further include one or more of the processes described above in connection with Figures 8-9.
  • FIG. 12A shows an apparatus for transmitting a data stream in a MIMO system according to an embodiment of the present invention.
  • the apparatus 1200A includes an interleaving unit 1210A, a mapping unit 1220A, and a transmitting unit 1230A.
  • the interleaving unit 1210A performs inter-layer interleaving on the N data streams to obtain N interleaved data streams
  • the mapping unit 1220A maps the N interleaved data streams to N layers in the MIMO channel space
  • the transmitting unit 1230A Send N interleaved data streams mapped on N layers.
  • the interleaving unit 1210A interleaves the N data streams such that the bit distribution (e.g., average or near average) of each of the N data streams is on different layers of the N layers,
  • the modulation symbols at the same time ie, symbol period/symbol position
  • the bits in the same modulation symbol are from the same as possible The data stream.
  • Figure 12B shows a schematic diagram of an apparatus 1200B for transmitting a data stream in a MIMO system in accordance with an embodiment of the present invention.
  • the apparatus 1200B includes an interleaving unit 1210B, a mapping unit 1220B, a transmitting unit 1230B, a cascading unit 1240B, a bit scrambling unit 1250B, a code block dividing unit 1260B, a channel coding unit 1270B, a physical layer HARQ function unit 1280B, and a physical code channel allocation unit 1290B.
  • Those skilled in the art will appreciate that all of the elements shown in Figure 12B are not necessarily required to implement the embodiments of the present invention, but that the specific functional units described above are shown in Figure 12B for convenience of illustration.
  • the interleaving unit 1210B performs inter-layer interleaving on the N data streams to obtain N interleaved data streams, and the mapping unit 1220B maps the N interleaved data streams to N layers respectively, and constellation point mapping The unit 12130B performs constellation point mapping on the N interleaved data streams mapped on the N layers to obtain constellation point symbols mapped on the N layers, and the transmitting unit 1230B transmits constellation point symbols mapped on the N layers.
  • bit scrambling unit 1250B performs bit scrambling on each of the N data streams
  • code block dividing unit 1260B separately performs code block partitioning on the N data streams scrambled by the bits
  • channel coding unit 1270B pairs The N data streams after the code block division are respectively subjected to channel coding, and the physical layer HARQ function unit 1280B performs physical layer HARQ function operation on the channel-coded N data streams, respectively, and the physical code channel allocation unit 1290B operates on the N after the HARQ function operation.
  • the data streams are respectively allocated to the physical code channel, and the HS-DSCH interleaving unit 12100B performs HS-DSCH interleaving on the N data streams allocated by the physical code channel, and the N data streams after the constellation point arrangement unit 12110B interleaves the HS-DSCH.
  • the constellation point arrangement is performed separately, and the physical channel mapping unit 12120B performs physical channel mapping on the N data streams in which the constellation points are arranged to obtain N processed data streams, and the interleaving unit 1210B performs layering on the N processed data streams.
  • mapping unit 1220B mapping the N interleaved data streams on N layers
  • constellation point mapping The unit 12130B performs constellation point mapping on the N interleaved data streams mapped on the N layers, and obtains constellation point symbols mapped on the N layers, and the sending unit 1230B Send constellation point symbols mapped on N layers.
  • the constellation point mapping unit 12130B separately maps the N data streams to the constellation points to obtain N constellation point symbol streams, and the interleaving unit 1210B interleaves the N constellation point symbol streams to obtain N interleaved constellation points.
  • the symbol stream, mapping unit 1220B maps the N interleaved constellation point symbol streams on N layers, and the transmitting unit 1230B transmits constellation point symbols mapped on the N layers.
  • bit scrambling unit 1250B performs bit scrambling on each of the N data streams
  • code block dividing unit 1260B performs code block partitioning on the N data streams scrambled by the bits
  • channel coding unit 1270B The N data streams after the code block are respectively subjected to channel coding, and the physical layer HARQ functional unit 1280B performs physical layer HARQ function operations on the channel-coded N data streams respectively, and the physical code channel allocation unit 1290B operates on the HARQ function.
  • the N data streams are respectively subjected to physical code channel allocation, and the HS-DSCH interleaving unit 12100B performs HS-DSCH interleaving on the N data streams allocated by the physical code channel, and the N data after the constellation point arrangement unit 12110B interleaves the HS-DSCH.
  • the streams are respectively arranged in a constellation point, and the physical channel mapping unit 12120B performs physical channel mapping on the N data streams in which the constellation points are arranged, and the constellation point mapping unit 12130 performs the constellation point mapping on the N data streams after the physical channel mapping.
  • the interleaving unit 1210B interleaves the N constellation point symbol streams, and obtains N interleaved constellation point symbol streams, mapping unit 1220B maps N interleaved constellation point symbol streams on N layers, and transmitting unit 1230B transmits constellation point symbols mapped on N layers.
  • the physical layer HARQ function unit 1280B performs physical layer HARQ function processing on the N data streams to obtain N HARQ function processed data streams, and the interleaving unit 1210B processes the N HARQ function processed data.
  • the stream performs inter-layer interleaving to obtain N interleaved data streams, mapping unit 1220B maps the N interleaved constellation point symbol streams on N layers, and transmitting unit 1230B transmits constellation point symbols mapped on N layers.
  • bit scrambling unit 1250B performs bit scrambling on each of the N data streams
  • code block dividing unit 1260B separately performs code block partitioning on the N data streams scrambled by the bits
  • channel coding unit 1270B The N data streams after the code block are respectively subjected to channel coding, and the physical layer HARQ functional unit performs physical layer HARQ function processing on the channel-coded N data streams to obtain N HARQ-processed data streams, and interleaves.
  • the unit 1210B performs inter-layer interleaving on the N HARQ-capable data streams to obtain N interleaved data streams, and the mapping unit 1220B maps the N interleaved constellation point symbol streams on the N layers, and the physical code channel
  • the allocation unit 1290B pairs are mapped on N layers
  • the N interleaved data streams are respectively subjected to physical code channel allocation, and the HS-DSCH interleaving unit 12100B performs HS-DSCH interleaving on the N data streams after the physical code channel allocation, and the constellation point arrangement unit 12110B interleaves the HS-DSCH.
  • the N data streams respectively perform constellation point arrangement, and the physical channel mapping unit 12120B performs physical channel mapping on the N data streams in which the constellation points are arranged, and the constellation point mapping unit 12130B performs constellation on the N data streams after the physical channel mapping respectively.
  • Point mapping to obtain constellation point symbols mapped on N layers, and transmitting unit 1230B transmits constellation point symbols mapped on the N layers.
  • the cascading unit 1240B cascades the N data streams to obtain a cascading data stream
  • the bit scrambling unit 1250B performs bit scrambling on the cascading data stream
  • the code block dividing unit 1260B scrambles the bits.
  • the cascading data stream performs code block segmentation
  • the channel coding unit 1270B performs channel coding on the cascading data stream after the code block segmentation
  • the physical layer HARQ function unit 1280B performs physical layer HARQ function operation on the channel coded cascading data stream to obtain
  • the interleaving unit 1210B performs inter-layer interleaving on the processed cascading data stream to obtain an interleaved cascading data stream
  • the mapping unit maps the interleaved cascading data stream on the N layers. N interleaved data streams mapped on N layers are obtained.
  • the physical code channel allocation unit 1290B performs physical code channel allocation on the N interleaved data streams mapped on the N layers, and the HS-DSCH interleaving unit 12100B allocates the physical code channels.
  • the N data streams are respectively HS-DSCH interleaved, and the constellation point arranging unit 12110B performs constellation point arrangement on the N data streams after the HS-DSCH interleaving, and the physical channel mapping unit 12120B separates the N data streams after the constellation points are respectively arranged.
  • the constellation point mapping unit 12130B performs constellation point mapping on the N data streams after the physical channel mapping, and obtains constellation point symbols mapped on the N layers, and the transmitting unit 1230B transmits the constellation mapped on the N layers. Point symbol.
  • the code block partitioning unit 1260B preferably divides the concatenated data stream into a plurality of coded code blocks of N, and the physical layer HARQ function unit 1280B performs the HARQ function as described in S56 above.
  • Bit collection is achieved by using the N ⁇ ⁇ ⁇ matrix method shown in FIG. 6 above.
  • the physical layer HARQ function unit 1280B does not perform the bit collection processing by using the method described in FIG. 6 above when performing the HARQ function operation as described in S56 above, but may adopt a conventional method.
  • a bit collection method, and preferably, the interleaving unit 1210B is as in S57 above
  • the sequence ai ' a w ' a ⁇ can be placed into a matrix of 2X dat by row, and the corresponding sequence parts are placed in reverse order when the second row is placed, to obtain matrix A.
  • the cascading unit 1240B cascades the N data streams to obtain a cascading data stream
  • the bit scrambling unit 1250B performs bit scrambling on the cascading data stream
  • the code block dividing unit 1260B scrambles the bits.
  • the cascading data stream performs code block segmentation
  • the channel coding unit 1270B performs channel coding on the cascading data stream after the code block segmentation
  • the physical layer HARQ function unit 1280B performs HARQ function operation on the channel-coded cascading data stream, and after processing
  • the layer dividing unit 12140B maps the processed cascading data stream on the N layers to obtain N data streams mapped on the N layers
  • the physical code channel allocating unit 1290B pairs are mapped in N data streams.
  • the N data streams on the layer are respectively subjected to physical code channel allocation, and the HS-DSCH interleaving unit 12100B performs HS-DSCH interleaving on the N data streams allocated by the physical code channel, and the constellation point arrangement unit 12110B interleaves the HS-DSCH.
  • the N data streams respectively perform constellation point arrangement, and the physical channel mapping unit 12120B performs physical channel mapping on the N data streams in which the constellation points are arranged, and the constellation point mapping unit 12130B pairs physical
  • the N data streams after channel mapping are constellation point mapping respectively, and the constellation point symbols mapped on the N layers are obtained, and the interleaving unit 1210B interleaves the N constellation point symbol streams to obtain N interleaved constellation point symbols.
  • mapping unit 1220B remaps the N interleaved constellation point symbol streams to N layers
  • the constellation point symbols remapped on the N layers are obtained, and the transmitting unit 1230B transmits the constellation point symbols remapped on the N layers.
  • the code block partitioning unit 1260B preferably divides the concatenated data stream into a plurality of coded code blocks of N, and the physical layer HARQ functional unit 1280B performs HARQ as described in S76 above. When the function is operated, it is used as shown in Figure 6 above. ⁇ ⁇ . A matrix approach to achieve bit collection.
  • the physical layer HARQ function unit 1280B does not perform the bit collection processing by using the method shown in FIG. 6 above when performing the HARQ function operation as described in S76 above, but may adopt a conventional method. a bit collection method, and preferably, the layer division unit 12140B performs layer segmentation as described in S77 above
  • sequence ai ' a2 ' - a can be placed into a matrix of 2X dM 2 by row, the corresponding sequence parts are placed in reverse order when the second row is placed, and the matrix A is obtained.
  • FIG. 13A shows a schematic diagram of an apparatus 1300A for transmitting a data stream in a MIMO system in accordance with an embodiment of the present invention.
  • the apparatus 1300A includes a mapping unit 1310A and a transmitting unit 1320A.
  • Mapping unit 1310A maps a plurality of data streams respectively on a plurality of layers of a MIMO channel space, wherein the plurality of layers correspond to one joint CQI from the receiver and each data stream corresponds to an independent ACK/NACK from the receiver An indication; the transmitting unit 1320A transmits a plurality of data streams mapped on a plurality of layers.
  • the transmitting unit 1320A when a plurality of ACK/NACKs corresponding to the plurality of data streams indicate that the plurality of data streams are not all correctly received, the transmitting unit 1320A is at the retransmission time at the plurality of times corresponding to the joint CQI. Only the data streams that need to be retransmitted are transmitted on the layer, and no new data streams are transmitted.
  • mapping unit 1310A maps a plurality of data streams respectively on a plurality of layers of a MIMO channel space, wherein the plurality of layers correspond to one joint CQI from the receiver and each data stream corresponds to from the receiver a separate ACK/NACK indication; the transmitting unit 1320A transmits the plurality of data streams mapped on the plurality of layers and the associated control corresponding to the plurality of data streams Signaling, the associated control signaling includes transport block size information of each of the plurality of data streams.
  • the multiple data streams may include an initial transport block, and the block size information of the initial transport block included in the associated control signaling is a transport block size value determined according to a corresponding joint CQI. .
  • the plurality of data streams may include a retransmission block, and the block size information of the retransmission block included in the associated control signaling is a transport block size value determined by the retransmission block at the time of its initial transmission.
  • the plurality of data streams may include both an initial transport block and a retransmission block, and the block size information of the initial transport block included in the associated control signaling is a transport block size value determined according to a corresponding joint CQI.
  • the block size information of the retransport block included in the associated control signaling is a transport block size value determined by the retransmission block when it is initially transmitted. When a plurality of joint CQIs are fed back, the number of transport block size information included in the associated control signaling increases proportionally with the number of the plurality of joint CQIs.
  • Figure 13B shows a schematic diagram of an apparatus 1300B for transmitting data streams in a MIMO system in accordance with an embodiment of the present invention.
  • Apparatus 1300B includes mapping unit 1310B, transmitting unit 1320B, cascading unit 1330B, bit scrambling unit 1340B, code block dividing unit 1350B, channel coding unit 1360B, physical layer HARQ functional unit 1370B, physical code channel allocation unit 1380B, HS-DSCH
  • the bit scrambling unit 1340B performs bit scrambling on each of the plurality of data streams
  • the code block dividing unit 1350B performs code block splitting on the plurality of data streams scrambled by the bits
  • the channel coding unit 1360B performs code block splitting.
  • the plurality of data streams are respectively subjected to channel coding
  • the physical layer HARQ function unit 1370B performs physical layer HARQ function operations on the channel-coded plurality of data streams respectively
  • the physical code channel allocating unit 1380B operates the plurality of data streams after the HARQ function operation.
  • the physical code channel allocation is performed separately, and the HS-DSCH interleaving unit 1390B performs HS-DSCH interleaving on the plurality of data streams allocated by the physical code channel, and the constellation point arranging unit 13100B performs constellation on the HS-DSCH interleaved multiple data streams respectively.
  • the mapping unit 1310 maps the processed plurality of constellation point symbol streams to multiple layers Symbol mapping constellation points obtained over a plurality of layers, the transmission unit 1320A transmits a symbol mapping constellation points on a plurality of layers.
  • the cascading unit 1330B cascades the plurality of data streams to obtain a cascading data stream, the bit scrambling unit 1340B performs bit scrambling on the cascading data stream, and the code block dividing unit 1350B scrambles the bits.
  • the cascading data stream performs code block division
  • the channel coding unit 1360B performs channel coding on the coded block cascading data stream
  • the physical layer HARQ function unit 1370B performs physical layer HARQ function operation on the channel coded cascading data stream.
  • the mapping unit 1310B maps the processed cascading data stream on multiple layers to obtain multiple data streams mapped on multiple layers
  • the physical code channel allocation unit 1380B maps multiple
  • the plurality of data streams on the layer are respectively subjected to physical code channel allocation
  • the HS-DSCH interleaving unit 1390B performs HS-DSCH interleaving on the plurality of data streams after the physical code channel allocation
  • the constellation point arrangement unit 13100B interleaves the HS-DSCH.
  • the plurality of data streams respectively perform constellation point arrangement
  • the physical channel mapping unit 13110B performs physical channel mapping on the plurality of data streams after the constellation points are arranged, and the constellation points are mapped.
  • the transmitting unit 13120B performs constellation point mapping on the plurality of data streams after the physical channel mapping, and obtains constellation point symbols mapped on the plurality of layers
  • the transmitting unit 1320A transmits the constellation point symbols mapped on the plurality of layers.
  • Figure 14 illustrates a wireless device 1400 that transmits data streams in a MIMO system.
  • the device 1400 includes various components coupled by a bus 1450, such as a processor 1430, a memory 1410, and a transceiver 1420.
  • Data 1411 and instructions 1412 can be stored in memory 1410.
  • the processor 1430 can implement the method of transmitting a data stream disclosed by embodiments of the present invention by executing the instruction 1412 and using the data 1411.
  • Transceiver 1420 is coupled to a plurality of antennas 1440-1 through 1440-N and includes transmitter 1421 and receiver 1422 to allow transmission and reception of signals between wireless device 1400 and remote devices.
  • the processor 1430 implements transmitting the data stream in the MIMO system by the data stream interleaving, mapping, and transmission methods explained in the above embodiments.
  • apparatus 1400 includes a processor 1430 and a memory 1410 coupled thereto, the processor 1430 configured to interleave N data streams to obtain N interleaved data streams, the N interleaved The data streams are mapped on N layers, respectively, and the N interleaved data streams mapped on the N layers are transmitted.
  • the processor 1430 performs inter-layer interleaving of the N data streams such that a bit distribution (eg, average or near-average distribution) of each of the N data streams is different to the N layers.
  • the modulation symbols at the same time are respectively derived from (mapped from) different data streams in the N data streams, and try to make the same
  • the bits in the modulation symbol are from the same data stream.
  • apparatus 1400 includes a processor 1430 and a memory 1410 coupled thereto.
  • the processor 1430 is configured to map the plurality of data streams to a plurality of layers, wherein the plurality of layers correspond to a joint CQI from the receiver and each of the plurality of data streams corresponds to the receiver An independent ACK/NACK indication; transmitting the plurality of data streams mapped on multiple layers.
  • a plurality of ACK/NACKs corresponding to the plurality of data streams indicate that the plurality of data streams are not all correctly received, only the plurality of layers corresponding to the joint CQI are transmitted at the retransmission time. The data stream that needs to be retransmitted, but not the new data stream.
  • apparatus 1400 includes a processor 1430 and a memory 1410 coupled thereto, the processor 1430 configured to map a plurality of data streams on a plurality of layers in a MIMO channel space, wherein the plurality of layers correspond to a joint CQI of the receiver, and each of the plurality of data streams respectively corresponds to an independent ACK/NACK feedback; transmitting the plurality of data streams mapped to the plurality of layers and the plurality of data Flow-dependent associated control signaling, the associated control signaling including transport block size information for each of the plurality of data streams.
  • the plurality of data streams may include an initial transport block, and the block size information of the initial transport block included in the associated control signaling is a transport block size value determined according to a corresponding joint CQI.
  • the plurality of data streams may include a retransmission block, and the block size information of the retransmission block included in the associated control signaling is a transport block size value determined by the retransmission block at the time of its initial transmission.
  • the plurality of data streams may include both an initial transport block and a retransmission block, and the block size information of the initial transport block included in the associated control signaling is a transport block size value determined according to a corresponding joint CQI.
  • the block size information of the retransport block included in the associated control signaling is a transport block size value determined by the retransmission block at the time of its initial transmission.
  • the number of transport block size information included in the associated control signaling increases proportionally with the number of the plurality of joint CQIs.
  • processor 1430 can perform various methods, such as the embodiments of Figures 2-9 and various variations thereof, to effect transmission of data streams in a MIMO system.
  • the disclosed apparatus and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed.
  • Another point of connection or direct connection or communication with each other displayed or discussed The connection may be an indirect connection or a communication connection through some interface, device or unit, and may be in electrical, mechanical or other form.
  • the functional units in the various embodiments of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented either in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may contribute to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium.
  • a number of instructions are included to cause a computing device (which may be a mobile terminal, a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a USB flash drive, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a random access memory (RAM), a disk or an optical disk, and the like. .

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EP12792975.0A EP2770657B1 (en) 2011-11-08 2012-04-23 Method and device for data stream transmission in a mimo system
CA2854676A CA2854676C (en) 2011-11-08 2012-04-23 Method and apparatus for transmitting data streams in mimo system
KR1020147014293A KR101639294B1 (ko) 2011-11-08 2012-04-23 Μιμο 시스템에서의 데이터 스트림 전송 방법 및 장치
US14/272,870 US9219575B2 (en) 2011-11-08 2014-05-08 Method and apparatus for transmitting data streams in MIMO system
US14/950,805 US20160080029A1 (en) 2011-11-08 2015-11-24 Method and apparatus for transmitting data streams in mimo system

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