US9270427B2 - System and method for multiplexing control and data channels in a multiple input, multiple output communications system - Google Patents

System and method for multiplexing control and data channels in a multiple input, multiple output communications system Download PDF

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US9270427B2
US9270427B2 US12/856,333 US85633310A US9270427B2 US 9270427 B2 US9270427 B2 US 9270427B2 US 85633310 A US85633310 A US 85633310A US 9270427 B2 US9270427 B2 US 9270427B2
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codewords
layers
control symbols
mimo
symbols
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US20110170625A1 (en
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Yufei Blankenship
Weimin Xiao
Ying Jin
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FutureWei Technologies Inc
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FutureWei Technologies Inc
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Assigned to FUTUREWEI TECHNOLOGIES, INC. reassignment FUTUREWEI TECHNOLOGIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BLANKENSHIP, YUFEI, JIN, YING, XIAO, WEIMIN
Priority to US12/856,333 priority Critical patent/US9270427B2/en
Priority to EP10841932.6A priority patent/EP2460285B1/en
Priority to PCT/CN2010/076662 priority patent/WO2011082589A1/en
Priority to EP18184279.0A priority patent/EP3461051B1/en
Priority to BR112012009642A priority patent/BR112012009642B8/pt
Priority to JP2012534527A priority patent/JP5898622B2/ja
Priority to RU2014107892/07A priority patent/RU2560836C2/ru
Priority to RU2012116338/07A priority patent/RU2516484C2/ru
Priority to CN201080034158.0A priority patent/CN102439866B/zh
Priority to KR1020127006863A priority patent/KR101183942B1/ko
Priority to US13/153,293 priority patent/US8059752B2/en
Publication of US20110170625A1 publication Critical patent/US20110170625A1/en
Priority to RU2015127797/07A priority patent/RU2599982C1/ru
Priority to JP2015190054A priority patent/JP6174648B2/ja
Priority to US15/047,493 priority patent/US9544034B2/en
Publication of US9270427B2 publication Critical patent/US9270427B2/en
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Priority to US15/400,709 priority patent/US9935696B2/en
Priority to US15/940,723 priority patent/US10396870B2/en
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    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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    • 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
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    • H04B7/00—Radio transmission systems, i.e. using radiation field
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    • 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
    • H—ELECTRICITY
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    • H04B7/00—Radio transmission systems, i.e. using radiation field
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    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
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    • 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
    • H04B7/0615—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 weighted versions of same signal
    • H04B7/0619—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 weighted versions of same signal using feedback from receiving side
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    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
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    • 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
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    • H04L1/0072—Error control for data other than payload data, e.g. control data
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    • H—ELECTRICITY
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    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1861—Physical mapping arrangements
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    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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    • H04L27/26—Systems using multi-frequency codes
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    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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    • H—ELECTRICITY
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    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • 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
    • H04B7/0615—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 weighted versions of same signal
    • H04B7/0619—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 weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]

Definitions

  • the present invention relates generally to wireless communications, and more particularly to a system and method for multiplexing control and data channels in a multiple input, multiple output (MIMO) communications system.
  • MIMO multiple input, multiple output
  • uplink control information may be sent in two ways: (a) without simultaneous transmission of data (i.e., uplink shared channel (UL-SCH)); and (b) with simultaneous transmission of UL-SCH.
  • UL-SCH uplink shared channel
  • control and data are sent on the same subframe.
  • the uplink layer 1 (L1)/layer 2 (L2) control signaling may be multiplexed with the coded UL-SCH onto a physical uplink shared channel (PUSCH) prior to modulation and discrete Fourier transform (DFT) transform precoding.
  • the control signaling may include hybrid automatic repeat request (HARQ) acknowledgements and channel status reports.
  • HARQ hybrid automatic repeat request
  • a method for transmitting control symbols and data symbols on multiple input, multiple output (MIMO) layers includes selecting a first set of codewords from N cw codewords, distributing control symbols onto the first set of layers, placing data symbols of the first set of codewords onto the first set of layers, placing data symbols of the (N cw -N cw1 ) remaining codewords to remaining layers if N cw >N cw1 , and transmitting the multiple MIMO layers.
  • the first set of codewords is associated with a first set of layers from the multiple MIMO layers, and the N cw codewords are to be transmitted simultaneously and the first set of codewords comprises N cw1 MIMO codewords, where N cw and N cw1 are integers greater than or equal to 1.
  • the remaining layers are MIMO layers from the multiple MIMO layers not in the first set of layers.
  • a method for transmitting control symbols and data symbols on multiple input, multiple output (MIMO) layers includes constructing one or more codewords to be simultaneously transmitted over a plurality of MIMO layers, distributing control symbols over the plurality of MIMO layers, placing data symbols of the one or more codewords onto the plurality of MIMO layers, and transmitting the multiple MIMO layers.
  • MIMO multiple input, multiple output
  • a method for transmitting control symbols and data symbols on multiple input, multiple output (MIMO) layers includes selecting a codeword from a plurality of codewords, distributing control symbols onto the subset of MIMO layers, placing data symbols of the plurality of codewords onto the plurality of layers, and transmitting the multiple MIMO layers.
  • the plurality of codewords are to be transmitted over a plurality of MIMO layers, and the selected codeword is to be transmitted over a subset of MIMO layers of the plurality of MIMO layers.
  • control signals multiplexed onto multiple MIMO layers may help with diversity processing gain.
  • Yet another advantage of an embodiment is that multiplexing the control signals onto multiple MIMO layers based on the type, requirements, and nature of the control information is transmitted. For example, CQI/PMI control signals may be mapped onto different MIMO layers or CWs or number of MIMO layers than HARQ ACK/NACK or RI.
  • FIG. 1 is a space diagram of a multiplexing of control and data in LTE
  • FIG. 2 is a diagram of a transmitter structure of rank-2 UL transmission using two TBs for two transmit antennas in the case of no ACK/NACK spatial bundling without layer shifting;
  • FIG. 3 is a diagram of a transmitter structure of rank-2 UL transmission using two TBs for two transmit antennas in the case of ACK/NACK spatial bundling with layer shifting;
  • FIG. 4 a is a diagram of a single codeword to a single layer mapping in LTE
  • FIG. 4 b is a diagram of a mapping of two codewords to two layers
  • FIG. 4 c is a diagram of a mapping of two codewords to three layers
  • FIG. 4 d is a diagram of a mapping of two codewords to four layers
  • FIG. 4 e is a diagram of a mapping of one codeword to two layers
  • FIG. 5 is a space diagram of two MIMO layers containing control and data from a single codeword
  • FIG. 6 is a space diagram of two MIMO layers containing control and data from two codewords
  • FIG. 7 is a space diagram of three MIMO layers containing control and data from two codewords.
  • FIG. 8 is a space diagram of two MIMO layers containing control and data from two codewords.
  • FIG. 1 illustrates space diagram 100 of a multiplexing of control and data in LTE.
  • control and data are multiplexed onto a single uplink layer.
  • Space diagram 100 may be partitioned into different zones with the zones carrying different information. Zones hashed with a similar hashing pattern carry similar information.
  • zone 105 may be used to carry a reference signal, e.g., a pilot. While zone 110 may be used to carry UL-SCH data, zone 115 may be used to carry channel quality indicator and/or precode matrix indication information, zone 120 may be used to carry ACKs/NACKs used in HARQ, and zone 125 may be used to carry rank indicator information.
  • Each zone may contain a plurality of resource elements (REs) with an exact number of resource elements assigned to an individual zone being dependent on factors such as coding and modulation scheme being used, communications system configuration, number of UE operating, and so forth.
  • REs resource elements
  • the proportions of the various zones shown in space diagram 100 are not intended to illustrate precise relationships of the amount of resource elements allocated to the various zones, but to convey a relative relationship and arrangement of the zones.
  • LTE-A LTE-Advanced
  • a transmission block TB
  • CW MIMO codeword
  • the maximum number of MIMO layers in LTE-A uplink is increased to four and the maximum number of MIMO codewords is increased to two.
  • FIG. 2 illustrates a transmitter structure 200 of rank-2 UL transmission using two TBs for two transmit antennas in the case of no ACK/NACK spatial bundling without layer shifting.
  • FIG. 3 illustrates a transmitter structure 300 of rank-2 UL transmission using two TBs for two transmit antennas in the case of ACK/NACK spatial bundling with layer shifting.
  • FIG. 4 a illustrates a single codeword to a single layer mapping in LTE.
  • FIG. 4 b illustrates a mapping of two codewords to two layers.
  • FIG. 4 c illustrates a mapping of two codewords to three layers.
  • FIG. 4 d illustrates a mapping of two codewords to four layers.
  • FIG. 4 e illustrates a mapping of one codeword to two layers. If the design used in DL LTE is used, then the mapping shown in FIG. 4 e may only be used for retransmissions where an initial transmission used two layers to send the TB. Further, the combinations of codeword (CW) to layer mapping shown in FIG. 4 a through FIG. 4 e can be used for LTE-Advanced uplink.
  • CW codeword
  • control signaling multiplexing with data on PUSCH is still needed for at least the following cases:
  • control-data multiplexing scheme As described for 3GPP Release-8 should be used (shown in FIG. 1 ). New designs of control-data multiplexing are discussed below for cases with multiple MIMO layers, e.g., one or more codewords mapped to two, three, or four MIMO layers (shown in FIGS. 4 b through 4 e ).
  • the multiplexing of control-data to multiple MIMO layer PUSCH transmission may take several approaches: single codeword or all codewords.
  • Single codeword rule Select layers associated with one of the codewords for control-data multiplexing.
  • a criteria or rule may be needed to select an appropriate codeword.
  • the codeword may be selected explicitly (for example, select a first codeword) via higher layer signaling or dynamic physical downlink control channel (PDCCH) signaling.
  • PDCCH dynamic physical downlink control channel
  • the codeword may be selected implicitly using a) a codeword's modulation and coding scheme (MCS) level as provided in the PDCCH that assigns the PUSCH, b) a codeword's signal plus interference to noise ratio (SINR), c) a number of layers occupied by a codeword, d) an impact of a codeword on PUSCH performance, e) HARQ transmission status, for example, initial versus re-transmissions or a combination thereof.
  • MCS modulation and coding scheme
  • SINR interference to noise ratio
  • All codewords rule User all the MIMO layers for control-data multiplexing. When one codeword is mapped to two layers, the single codeword strategy degenerates to the all codewords strategy.
  • ACK/NACK spatial bundling LS/ANB
  • Further considerations may include the type of receiver (successive interference cancellation (SIC) versus minimum mean-square error (MMSE)) that an enhanced NodeB (eNB) is likely to implement, whether re-transmission is on one of the codewords in case of no LS/ANB, size (number of bits) of the control information (relative to that of the PUSCH resource allocated).
  • SIC successive interference cancellation
  • MMSE minimum mean-square error
  • eNB enhanced NodeB
  • size number of bits of the control information (relative to that of the PUSCH resource allocated).
  • CQI/PMI may be mapped to different layers or CWs, or a different number of layers or CWs, than the ACK/NACK or RI.
  • LTE control information such as ACK/NACK, RI, CQI/PMI
  • other control signaling such as carrier indicators, may be processed in a similar manner in LTE-A.
  • control information Since control information is important for the proper functioning of a communications system, they need to be protected as much as possible to that they may be received by the eNB correctly. Furthermore, the control information is relatively small and is protected by relatively weak codes, such as block codes and convolutional codes, thus a physical channel with better quality should be used to carry the control information.
  • design considerations may include:
  • the control-data multiplexing is as follows.
  • the illustrated locations of the control signals e.g., FIGS. 1 , 5 - 8
  • the amount of resource elements allocated for each type of control signaling is for illustration only.
  • the number of modulation symbols for each type of control signaling will be calculated as a function of several variables. Then a rule may be used to assign the modulation symbols to the resource elements till all the modulation symbols are exhausted. The number of modulation symbols allocated in each layer/slot may vary.
  • FIG. 5 illustrates a space diagram 500 of two MIMO layers containing control and data from a single codeword.
  • Control information (contained in zone 505 and zone 506 as well as zones 510 - 513 ) may be multiplexed onto both layers, wherein control modulation symbols occupy the same (or approximately the same) resource elements in both layers.
  • the information carried over zones such as zones 510 - 513 , may be time-division multiplexed with the data.
  • zones 510 - 513 may also be used to carry HARQ ACK/NACK information and rank indicator (RI).
  • FIG. 6 illustrates a space diagram 600 of two MIMO layers containing control and data from two codewords. Map control information to a layer according to single codeword rule as discussed previously (zone 605 and zones 615 and 616 ). Let the layer carrying the control information be referred to as layer X. Within layer X, the multiplexing of control and data reuses the 3GPP Release-8 design. Here the control information includes not only CQI, ACK/NACK, RI used in Release-8, but it also includes any new type of control information that may be defined for Release-10 or later, e.g., indicator for carrier aggregation and COMP, etc. Zone 610 carries data from codeword with control and data, while zone 611 carries data from codeword with only data.
  • FIG. 7 illustrates a space diagram 700 of three MIMO layers containing control and data from two codewords.
  • a first codeword let it be referred to as CW 1
  • a second codeword let it be referred to as CW 2
  • CW 2 contains twice as many modulation symbols as CW 1 if control information is excluded.
  • multiplexing control symbols with CW 2 may be better than multiplexing with CW 1 in terms of a number of data modulation symbols being punctured from a codeword.
  • Zone 705 and zones 720 and 721 contain control information from codeword containing control and data
  • zone 710 contains data from codeword containing control and data
  • zone 715 contains data from codeword containing only data.
  • codeword X is selected according to single codeword rule as discussed previously. Within codeword X, multiplexing of control and data may be performed as with codeword CW 2 in the case with two codewords mapped to three layers.
  • FIG. 8 illustrates a space diagram 800 of two MIMO layers containing control and data from two codewords.
  • control information may be mapped to both layers, while data from each of the two codewords are mapped to a single layer.
  • the mapping of control and data from two codewords to two MIMO layers as shown in FIG. 8 may have an advantage of maximizing spatial diversity for the control information as well as better coverage of control information.
  • Zones 805 and 806 as well as zones 815 through 818 carry control information from both codewords, while zone 810 carries data from a first codeword and zone 811 carries data from a second codeword.
  • control signaling may be difficult due to separate processing of two transmission blocks. For example, two transmission blocks may have different modulation orders, thereby causing control information to use two different modulation orders. If a SIC receiver is used, mapping control information to all layers may make it difficult to implement the cancellation. Additionally, if ACK/NACK spatial bundling with layer shifting is adopted, full or close to full spatial diversity may be available to each layer, making all codeword mapping even more unattractive.
  • formulas for determining a number of coded symbols for HARQ-ACK or rank indicator and channel quality information are:
  • the order of mapping REs across layers need to be defined.
  • a weighted (by number of layers of each codeword) average MPR may be used to calculate the number coded symbols for the control information while the original formula of LTE Release-8 uses the MPR of a single codeword.
  • an order of mapping resource elements across layers and codewords need to be defined. In order to achieve diversity gain, the mapping may be first made across codewords/layers. In the case that different modulation levels are used in the two codewords, coding scheme of ACK/NACK and RI need to be modified.
  • mapping may be first made across codewords/layers. In the case that different modulation levels are used in the two codewords, performance need to be verified. Furthermore, rank dependent offset values may be considered for all cases where different values of the offset ⁇ may be configured for different number of layers of PUSCH transmission.
  • SIC Single- Selecting CW for multiplexing could be Selecting CW for multiplexing receiver CW tricky. Due to ANB, balancing the FER could be tricky. performance of the 2 CWs need to be considered. All- Different MCS levels may be used for Different MCS levels are likely CWs the 2 CWs which make it difficult to for the 2 CWs which make it determine the number of coded symbols difficult to determine the number for the control information. In addition, of coded symbols for the control multiplexing control in both CWs may information. In addition, interrupt the SIC receiver behavior. Due multiplexing control in both to ANB, balancing the FER performance CWs may interrupt the SIC of the 2 CWs need to be considered. receiver behavior.
  • Advantageous features of embodiments of the invention may include: a method for transmitting control symbols and data symbols on multiple MIMO layers, the method comprising: selecting a first set of codewords associated with a first set of layers from the multiple MIMO layers from N cw codewords, wherein the N cw codewords are to be transmitted simultaneously and the first set of codewords comprises N cw1 MIMO codewords, where N cw1 is an integer greater than or equal to 1; distributing control symbols onto the first set of layers; placing data symbols of the first set of codewords onto the first set of layers; placing data symbols of the (N cw -N cw1 ) remaining codewords to remaining layers if N cw >N cw1 ; and transmitting the multiple MIMO layers.
  • the method could further include, wherein the first set of codewords comprises a single codeword.
  • the method could further include, wherein the first set of codewords is selected by a communications device.
  • the method could further include, wherein the first set of codewords is selected based on channel quality.
  • the method could further include, wherein the first set of codewords is selected based on a modulating and coding scheme (MCS) level associated with the codewords.
  • MCS modulating and coding scheme
  • the method could further include, wherein the first set of codewords is selected based on the number of layers associated with the codewords.
  • the method could further include, wherein the first set of codewords is selected based on a level of impact the control symbols have on the performance of the data transmission of each codeword.
  • MCS modulating and coding scheme
  • the method could further include, wherein the impact is a proportion of control symbols to data symbols for each codeword.
  • the method could further include, wherein the first set of codewords is selected based on a hybrid automatic repeat request (HARQ) transmission status associated with the codewords.
  • the method could further include, wherein the first set of codewords is selected by a controller serving a communications device.
  • the method could further include, wherein the first set of codewords is signaled to the communications device via a downlink message.
  • the method could further include, wherein the first set of codewords comprises N cw codewords.
  • the method could further include, wherein distributing control symbols onto the first set of layers is based on the MCS levels of the first set of codewords.
  • the method could further include, wherein distributing control symbols onto the first set of layers is based on a weighted MCS levels of the first set of codewords.
  • the method could further include, wherein distributing control symbols onto the first set of layers comprises distributing control symbols substantially equally onto the first set of layers.
  • selecting a first set of codewords comprises selecting two different first set of codewords for two different types of control symbols.

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CN201080034158.0A CN102439866B (zh) 2010-01-11 2010-09-07 用于多输入多输出通信系统中多路复用控制和数据信道的系统和方法
PCT/CN2010/076662 WO2011082589A1 (en) 2010-01-11 2010-09-07 Methods for multiplexing control and data channels in a multiple input multiple output(mimo) communication system
EP18184279.0A EP3461051B1 (en) 2010-01-11 2010-09-07 Method for multiplexing control and data channels in a multiple input, multiple output communications system
BR112012009642A BR112012009642B8 (pt) 2010-01-11 2010-09-07 sistema e método de multiplexação de canais de dados e controle em um sistema de comunicação de múltiplas entradas, múltiplas saídas (mimo)
JP2012534527A JP5898622B2 (ja) 2010-01-11 2010-09-07 複数入力複数出力（ｍｉｍｏ）通信システムにおいて制御及びデータチャネルを多重化する方法
RU2014107892/07A RU2560836C2 (ru) 2010-01-11 2010-09-07 Система и способ мультиплексирования каналов управления и данных в системе связи с множеством входов и множеством выходов (mimo)
RU2012116338/07A RU2516484C2 (ru) 2010-01-11 2010-09-07 Система и способ мультиплексирования каналов управления и данных в системе связи с множеством входов и множеством выходов (mimo)
EP10841932.6A EP2460285B1 (en) 2010-01-11 2010-09-07 Method for multiplexing control and data channels in a multiple input multiple output(mimo) communication system
KR1020127006863A KR101183942B1 (ko) 2010-01-11 2010-09-07 다중 입력, 다중 출력 통신 시스템에서의 제어 채널과 데이터 채널을 다중화하는 시스템 및 방법
US13/153,293 US8059752B2 (en) 2010-01-11 2011-06-03 System and method for multiplexing control and data channels in a multiple input, multiple output communications system
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US15/047,493 US9544034B2 (en) 2010-01-11 2016-02-18 System and method for multiplexing control and data channels in a multiple input, multiple output communications system
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US10230437B2 (en) * 2015-08-31 2019-03-12 Ntt Docomo, Inc. User terminal, radio base station, and radio communication method
US10972160B1 (en) 2020-04-21 2021-04-06 Sprint Spectrum L.P. Wireless communications over multiple input multiple output (MIMO) layers based on backhaul link quality
US11374632B2 (en) 2020-04-21 2022-06-28 Sprint Communications Company L.P. Wireless communications over multiple input multiple output (MIMO) layers based on backhaul link quality

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