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WO2016004614A1 - 一种数据传输方法、用户设备和基站 - Google Patents

一种数据传输方法、用户设备和基站 Download PDF

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Publication number
WO2016004614A1
WO2016004614A1 PCT/CN2014/082010 CN2014082010W WO2016004614A1 WO 2016004614 A1 WO2016004614 A1 WO 2016004614A1 CN 2014082010 W CN2014082010 W CN 2014082010W WO 2016004614 A1 WO2016004614 A1 WO 2016004614A1
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WO
WIPO (PCT)
Prior art keywords
codeword
mapping
layer
layers
base station
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2014/082010
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English (en)
French (fr)
Inventor
王建国
周永行
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to ES14897351T priority Critical patent/ES2761289T3/es
Priority to CN201910203384.XA priority patent/CN109951217B/zh
Priority to KR1020177003524A priority patent/KR20170028983A/ko
Priority to PCT/CN2014/082010 priority patent/WO2016004614A1/zh
Priority to CN201480036839.9A priority patent/CN105453693B/zh
Priority to EP14897351.4A priority patent/EP3160210B1/en
Publication of WO2016004614A1 publication Critical patent/WO2016004614A1/zh
Priority to US15/403,272 priority patent/US10432371B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity 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
    • H04B7/0615Diversity 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
    • H04B7/0619Diversity 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
    • H04B7/0621Feedback content
    • H04B7/0626Channel coefficients, e.g. channel state information [CSI]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems
    • H04B7/0417Feedback systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems
    • H04B7/0452Multi-user MIMO systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems
    • H04B7/0456Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/046Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
    • H04B7/0473Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking constraints in layer or codeword to antenna mapping into account
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity 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
    • H04B7/0615Diversity 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
    • H04B7/0619Diversity 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
    • H04B7/0621Feedback content
    • H04B7/063Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity 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
    • H04B7/0615Diversity 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
    • H04B7/0619Diversity 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
    • H04B7/0621Feedback content
    • H04B7/0632Channel quality parameters, e.g. channel quality indicator [CQI]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058Allocation criteria
    • H04L5/006Quality of the received signal, e.g. BER, SNR, water filling
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/23Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02Terminal devices

Definitions

  • the present invention relates to the field of communications, and in particular, to a data transmission method, a user equipment, and a base station. Background technique
  • Multi-antennas are now widely used in communication systems to increase the capacity of the system or to improve the user experience.
  • the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) R8 system can support 4 antenna ports, while the LTE R10 system can support 8 antenna ports.
  • the existing LTE R10 system supports sending up to 2 Transport Blocks (TBs). Each TB is channel coded and is called a Codeword (CW). So today's systems need to map up to 2 CWs to a maximum of 4 layers or a maximum of 8 layers.
  • 3GPP 3rd Generation Partnership Project
  • LTE Long Term Evolution
  • CW Codeword
  • the existing system feeds back a channel quality indicator (CQI) for each CW, where the CQI can be used to indicate that the TB of the CW corresponding to the data channel is transmitted with a block error rate that is not less than a specified threshold (for example, 10%) corresponds to the Modulation Coding Scheme (MCS), and the MCS indicated by CQI has a Signal to Interference plus Noise Ratio (SINR) interval, which can be understood as One CQI corresponds to one SINR interval.
  • CQI channel quality indicator
  • the channel transmission can use up to 4 or 8 layers, which causes each CQI to reflect the channel quality of multiple layers, and
  • the data transmission is performed by the base station according to the CQI fed back by the user equipment.
  • the embodiment of the invention provides a data transmission method, a user equipment and a base station, which can improve transmission The accuracy of the MCS used in the data, as well as the throughput of the communication system.
  • an embodiment of the present invention provides a data transmission method, including:
  • the user equipment obtains channel state information CSI including a rank indication RI and a channel quality indicator CQI based on the first mapping of the first reference signal set and the codeword to layer, and sends the CSI to the base station, where
  • the first mapping of the codeword to the layer includes a first mapping of the at least one codeword and the at least one transport layer, where the transport layer is a transport layer between the base station and the user equipment;
  • the user equipment receives, according to the second reference signal set and the second mapping of the codeword to the layer, the data sent by the base station, where the number of layers of the at least one codeword mapping in the first mapping of the codeword to the layer is greater than The number of layers of the codeword mapping in the second mapping of the codeword to the layer is less, wherein the first mapping of the codeword to the layer comprises a second mapping of at least one codeword and at least one of the transport layers.
  • the first mapping of the codeword to the layer includes at least one of the following:
  • the first mapping of the codeword to the layer includes at least the following mapping:
  • N is the number of layers
  • N cw is the number of code words
  • ", ⁇ (1) ⁇ , ⁇ (2) «, ⁇ (3) ⁇ are the symbols transmitted on each layer
  • d( °) (i) , d (1) (i) , d( (i) , d( (i) are the symbols contained in each codeword
  • M symb , ⁇ M / ⁇ s ( y 1 m ) b , M symb , ⁇ are the number of symbols transmitted by each layer.
  • the first mapping of the codeword to the layer or the second mapping of the codeword to the layer is performed by the base station Configured by signaling.
  • an embodiment of the present invention provides a data transmission method, including:
  • the base station sends a first reference signal set to the user equipment
  • the base station receives, by the user equipment, channel state information CSI, which includes a rank indication RI and a channel quality indicator CQI, where the CSI is based on the first reference signal set and the codeword to layer of the user equipment.
  • CSI channel state information
  • RI rank indication
  • CQI channel quality indicator
  • the base station transmits data to the user equipment based on a second mapping of a codeword to a layer, so that the user equipment receives the base station based on the second reference signal set and the second mapping of the codeword to layer Transmitting the data, where the number of layers of the at least one codeword mapping in the first mapping of the codeword to layer is less than the number of layers of the codeword mapping in the second mapping of the codeword to layer,
  • the first mapping of codewords to layers includes a second mapping of at least one codeword to at least one of the transport layers.
  • the first mapping of the codeword to the layer includes at least one of the following:
  • the first mapping of the codeword to the layer includes at least the following mapping:
  • the first mapping of the codeword to the layer or the codeword to layer is configured by using the signaling to the user equipment The second mapping.
  • the present invention provides a user equipment, including: a receiving unit and a sending unit, where: the receiving unit is configured to receive a first reference signal set sent by a base station;
  • the sending unit is configured to obtain channel state information CSI including a rank indication RI and a channel quality indicator CQI based on the first mapping of the first reference signal set and the codeword to layer, and send the CSI to the base station,
  • the first mapping of the codeword to the layer includes a first mapping of at least one codeword and at least one transport layer, where the transport layer is a transport layer between the base station and the user equipment;
  • the receiving unit is further configured to receive a second reference signal set sent by the base station;
  • the receiving unit is further configured to receive, according to the second reference signal set and the second mapping of the codeword to the layer, the data sent by the base station, where the codeword is at least one layer of the codeword mapping in the first mapping of the layer.
  • the number of layers of the codeword mapping in the second mapping of the codeword to layer is less, wherein the first mapping of the codeword to layer includes at least one codeword and a second mapping of at least one of the transport layers .
  • the first mapping of the codeword to the layer includes at least one of the following:
  • the first mapping of the codeword to the layer includes at least the following mapping: Layer digital word digital word to layer mapping
  • x (3 '(i) d (3 '(i)
  • N is the number of layers
  • N c W is the number of code words
  • X (Q) «, ⁇ (1) ⁇ , ⁇ (2) «, ⁇ (3 ) [omega] are transmitted symbol on each layer, d (°) (i) , d (1) (i), d ((i), d ((i) are contained in each code word symbol,
  • a first mapping of codewords to layers or a second mapping of the codewords to layers is configured by the base station by signaling.
  • the present invention provides a base station, including: a sending unit and a receiving unit, where: the sending unit is configured to send a first reference signal set to a user equipment;
  • the receiving unit is configured to receive channel state information csi that is sent by the user equipment, including a rank indication RI and a channel quality indicator CQI, where the csi is the user equipment based on the first reference signal set and a codeword a first mapping to the first mapping of the layer, where the first mapping of the codeword to the layer includes a first mapping of the at least one codeword and the at least one transport layer, where the transport layer is the base station and the user equipment Transport layer
  • the sending unit is further configured to send a second reference signal set to the user equipment
  • the transmitting unit is further configured to send data sent to the user equipment based on a second mapping of a codeword to a layer, so that the user equipment is based on the second reference signal set and the second mapping of the codeword to a layer.
  • the first mapping of the codeword to the layer includes At least one of the following:
  • the first mapping of the codeword to the layer includes at least the following mapping:
  • N is the number of layers
  • N c W is the number of code words
  • X (Q) «, ⁇ (1) ⁇ , ⁇ (2) «, ⁇ (3) ⁇ are the symbols transmitted on each layer
  • d ( °) (i) , d(1)(i) , d( (i) , d( (i) are the symbols contained in each codeword
  • the base station Also includes:
  • a configuration unit configured to configure, by using the signaling, the first mapping of the codeword to a layer or the second mapping of the codeword to a layer to the user equipment.
  • the present invention provides a user equipment, including: a receiver, a processor, and a transmitter, where:
  • the receiver is configured to receive a first reference signal set sent by the base station
  • the processor is configured to obtain, according to the first mapping of the first reference signal set and the codeword to the layer, channel state information CSI including a rank indication RI and a channel quality indicator CQI, where the codeword to layer a mapping comprising a first mapping of at least one codeword and at least one transport layer, the transport layer being a transport layer between the base station and the user equipment;
  • the transmitter configured to send the CSI to the base station;
  • the receiver is further configured to receive a second reference signal set sent by the base station;
  • the receiver is further configured to receive data sent by the base station based on the second reference signal set and the second mapping of the codeword to the layer, where the codeword is at least one layer of the codeword mapping in the first mapping of the layer The number is less than the number of layers of the codeword mapping in the second mapping of the codeword to the layer, wherein the first mapping of the codeword to the layer includes the second mapping of the at least one codeword and the at least one of the transport layers .
  • the first mapping of the codeword to the layer includes at least one of the following:
  • the first mapping of the codeword to the layer includes at least the following mapping:
  • N is the number of layers
  • N c W is the number of code words
  • X (Q) «, ⁇ (1) ⁇ , ⁇ (2) «, ⁇ (3) ⁇ are the symbols transmitted on each layer
  • d ( °) (i) , d(1)(i) , d( (i) , d( (i) are the symbols contained in each codeword
  • a first mapping of codewords to layers or a second mapping of the codewords to layers is configured by the base station by signaling.
  • the present invention provides a base station, including: a transmitter and a receiver, where: the transmitter is configured to send a first reference signal set to a user equipment;
  • the receiver is configured to receive, by the user equipment, a rank indication RI and a channel quality indicator Channel state information CSI of the CQI, where the CSI is obtained by the user equipment based on the first mapping of the first reference signal set and the codeword to the layer, where the first mapping of the codeword to the layer a first mapping comprising at least one codeword and at least one transport layer, the transport layer being a transport layer between the base station and the user equipment;
  • the transmitter is further configured to send a second reference signal set to the user equipment
  • the transmitter is further configured to send data to the user equipment based on a second mapping of a codeword to a layer, and send the data to the user equipment, so that the user equipment is based on the second reference signal set
  • the number of layers of the codeword mapping in the second mapping is small
  • the first mapping of the codeword to the layer includes a second mapping of at least one codeword and at least one of the transport layers.
  • the first mapping of the codeword to the layer includes at least one of the following:
  • the first mapping of the codeword to the layer includes at least the following mapping:
  • N is the number of layers
  • N cw is the number of code words
  • d( °) (i) , d (1 ) (i) , d( (i) , d( (i) are the symbols contained in each codeword
  • the transmitter is further configured to configure, by using the signaling, the first mapping of the codeword to a layer by using the user equipment Or the second mapping of the codeword to the layer.
  • the user equipment receives the first reference signal set sent by the base station, and the user equipment obtains the CSI including the RI and the CQI based on the first mapping of the first reference signal set and the codeword to the layer, and sends the CSI to the base station, and Receiving data transmitted by the base station is received based on the second reference signal set and the second mapping of the codeword to the layer. Since the number of layers including at least one codeword mapping in the first mapping of the codeword to the layer is smaller than the number of layers in the second mapping of the codeword to the layer, the CQI and the data are obtained in the prior art.
  • the CQI in the present invention reflects fewer layers than the prior art, and when the number of layers reflected by the CQI is smaller, the channel quality corresponding to each layer can be better. It is described that the base station can acquire finer channel quality information about the user equipment, thereby improving scheduling accuracy, in particular, improving the accuracy of the MCS when transmitting data, and improving the accuracy of CQI adjustment when implementing MU-MIMO transmission. Sex and increase the number of paired user devices to increase system throughput. DRAWINGS
  • FIG. 1 is a schematic flowchart of a data transmission method according to an embodiment of the present invention.
  • FIG. 2 is a schematic flowchart of another data transmission method according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a user equipment according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of another base station according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic structural diagram of another user equipment according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic structural diagram of another base station according to an embodiment of the present invention.
  • the technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access Wireless
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • a user equipment which may also be called a mobile terminal (Mobile Terminal), a mobile user equipment, etc.
  • a radio access network eg, RAN, Radio Access Network
  • the core network communicates, and the user equipment can be a mobile terminal, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal, for example, can be portable, pocket, handheld, computer built, or in-vehicle mobile Devices; user equipment may also be relays; they exchange language and/or data with the radio access network.
  • the base station may be a base station (BTS, Base Transceiver Station) in GSM or CDMA, or may be a base station (NodeB) in WCDMA, or may be an evolved Node B in LTE (eNB or e-NodeB, evolved Node B)
  • BTS Base Transceiver Station
  • NodeB base station
  • eNB or e-NodeB evolved Node B
  • the relay is not limited in this embodiment of the present invention.
  • FIG. 1 is a schematic flowchart of a data transmission method according to an embodiment of the present invention. As shown in FIG. 1, the method includes the following steps:
  • the user terminal receives a first reference signal set sent by the base station.
  • the reference signal in the first reference signal set may be a cell-specific reference signal.
  • CRS Cell specific Reference Signal
  • CSI RS Channel State Information Reference Signal
  • the first reference signal set may include one or more reference signals.
  • a user obtains a CSI including an RI and a CQI according to the first mapping of the first reference signal set and the codeword to a layer, and sends the CSI to the base station, where the codeword reaches a layer
  • a mapping includes a first mapping of at least one codeword to at least one transport layer, the transport layer being a transport layer between the base station and the user equipment.
  • step 102 may include:
  • CSI including RI and CQI is obtained, and the CSI is sent to the base station, where the CQI is obtained based on the first mapping of the codeword to the layer.
  • the CSI may further include a Precoding Matrix Indicator Index (PMI).
  • PMI Precoding Matrix Indicator Index
  • the steps of obtaining the RI and the CSI may refer to the following steps:
  • the optimal rank r* may be the above RI
  • the SINR of each symbol of each codeword can be obtained, where;
  • the symbols transmitted on each layer may be symbols that are transmitted on each layer in the process of transmitting a signal by the base station to the user equipment.
  • one codeword can contain multiple symbols, and one codeword contains multiple The symbols may be transmitted on different layers.
  • the above channel estimate may be a channel estimate on a resource element (Resource Element, RE) used by the first reference signal set.
  • RE resource element
  • the Least Squared (LS) method or the Minimum Mean Squared Error (MMSE) criterion is used to obtain the channel estimation value.
  • the LS method can directly obtain the channel estimation value used by the reference signal, and the MMSE method is used for interpolation or extrapolation, and channel estimation values on each RE in one or more resource blocks (RBs) can be obtained.
  • LS Least Squared
  • MMSE Minimum Mean Squared Error
  • H (i) is a matrix of N , which is the number of receiving antennas of the user equipment, ⁇ ⁇ is the number of transmitting antennas of the base station; y (i) is the received signal vector of the user equipment on the REi, W (i) Is a precoding matrix of ⁇ used on REi, where r is the rank of the precoding matrix; X (i) is the symbol vector of the r dimension transmitted by the base station, and n (i) is the measurement noise of the dimension, the measurement noise It may include thermal noise of the receiver as well as interference from within or outside the cell; N is the number of resource elements used.
  • the precoding matrix W(i) may be selected from a codebook C, where the codebook C may be configured in the user equipment and the base station, and the base station may use high layer signaling, such as an RRC letter. It is possible to limit the subset of codebooks that the user device can select or use.
  • the foregoing precoding matrix W W may be predefined and is well known to the user equipment and the base station.
  • the precoding matrix w ( i ) selected by the user equipment may be determined according to the resource unit or antenna port or rank r used.
  • the precoding matrix W (i) precoding matrix is selected according to the following formula
  • Precoding matrix rank r of the composition Precoding matrix rank r of the composition, k indicating or index codebook used or codebook subsets precoding matrix, a codebook or codebook subset C W with the index or indication k corresponding precoding matrix, N Is the size of the codebook or codebook subset C (t) , that is, the total number of precoding matrices in ⁇ .
  • the choice of its precoding matrix can be predefined.
  • the selection may be performed according to the above two formulas, so that the user equipment does not have to feed back or report the precoding matrix indication k, but the rank r selection can still be obtained by the user equipment based on the channel estimation obtained by the user equipment.
  • the user equipment may select a user according to the foregoing system equation, and a predefined selection method of the precoding matrix according to the value of each different rank r, and according to a predefined criterion.
  • the optimal rank r* of the device may also be selected by using a criterion such as a capacity maximization criterion, a throughput maximization criterion, or a mutual information maximization. The present invention does not limit this.
  • the above-described optimal rank r* can be used as the RI in the above CSI.
  • the signal to interference and noise ratio S 1 ⁇ ) corresponding to REi at each layer can be obtained according to the above system equation.
  • the signal to interference and noise ratio 8 ⁇ 1 ⁇ ) corresponding to REi at each layer can be obtained.
  • the above CQI is based on the first mapping of the codeword to the layer, and N cw codewords and N layers are taken as an example.
  • the number of symbols in each codeword is ⁇ 2. ,... ⁇ — 1
  • the number of layers N is equal to the rank indication used.
  • the symbol vector sent by REi can be expressed as
  • each codeword in the first mapping of the codeword to the layer, can be mapped to one layer or multiple layers.
  • the first mapping of the codeword to the layer can be as shown in Table 1. It should be noted that the number of symbols wherein each RE total number n of the transmission using «equal to B.
  • the first mapping relationship of the first codeword to the layer represented by Table 1 at least one of the following: a mapping of three codewords and three layers, wherein one codeword is only allowed to be mapped to one layer; and four A mapping of codewords to four layers, where one codeword is only allowed to be mapped to one layer.
  • Each codeword can be sequentially mapped to a corresponding layer in order, and an index value of a layer to which the codeword is mapped is equal to an index value of the codeword.
  • the first code word can be mapped to the first layer
  • the second code word can be mapped to the second layer
  • the third code word can be mapped to the third layer
  • Each codeword can be sequentially mapped to a corresponding layer in order, the layer of the layer to which each codeword is mapped can be mapped to the second layer, the second codeword can be mapped to the third layer, and the third codeword can be Mapping to the first layer; wherein sequence 2, 3, 1 is a cyclic shift of sequence 1, 2, 3; for example, the first codeword can be mapped to the third layer, and the second codeword can be mapped to the first Layer, the third codeword can be mapped to the second layer, and so on. Wherein the sequence 3, 1, 2 is a cyclic shift of the sequence 1, 2, 3;
  • the first mapping of the codeword to the layer may include at least the following mapping:
  • N is the number of layers
  • N c W is the number of code words
  • X (Q) «, ⁇ (1) ⁇ , ⁇ (2) «, ⁇ (3) ⁇ are the symbols transmitted on each layer
  • d ( °) (i) , d(1)(i) , d( (i) , d( (i) are the symbols contained in each codeword
  • the channel quality information can be indicated by more CQIs. Since the data transmission is scheduled by the base station according to the CQI fed back by the user equipment, more CQI information, corresponding to each layer The channel quality can be better described, so that the base station can obtain finer channel quality information about the user equipment, so that the scheduling accuracy can be improved, in particular, the modulation coding mode can be determined more accurately.
  • achieve MU-MIMO transmission can improve the accuracy of CQI adjustment and increase the number of paired UEs, thereby improving the throughput of the entire system.
  • the first mapping of the codeword to layer or the second mapping of the codeword to layer is configured by the base station by signaling. That is, the first mapping of the above codeword to layer or the second mapping of the codeword to layer can be implemented by the base station.
  • the first mapping of the codeword to the layer or the second mapping of the codeword to the layer may be specifically configured by high layer signaling, such as Radio Resource Control (RRC) signaling or dynamic signaling, such as DCI.
  • RRC Radio Resource Control
  • DCI Dynamic Call Identity
  • the first mapping of the codeword to the layer may include a plurality of different tables in a form similar to Table 2, and the different tables may be indicated by different indexes.
  • the different tables can contain 2 or 4 or 8 tables, which can be indicated by 1 or 2 or 3 bits.
  • the index or indication information may be sent to the user equipment through the foregoing RRC signaling or DCI information.
  • each codeword can obtain an equivalent SNR, ie ESNR, and the ESNR corresponding to each codeword can be called the SNR of the codeword.
  • SNR and each code word can be quantified as a CQI.
  • the 4-bit CQI index CQI values i.e. 16 illustrated example, i.e., the codeword for the CQI may be quantized SNR reference relationships shown in Table 3.
  • Different ESNRs are quantized into CQI index values according to Table 3. For example, according to Table 3, if the SNR of a codeword is in the interval [-5.108, -3.216), then the CQI corresponding to the codeword is 2. That is, if the code SNR ⁇ -5.108 ⁇ ESNR ⁇ -3.216, the code word corresponds to a CQI of 2.
  • the CQI may reflect a transmission on a subband, which may be referred to as a subband CQI.
  • the CQI may also reflect a transmission on a system bandwidth, which may be referred to as a wideband CQI.
  • the CQI and the RI may be fed back or reported to the base station in the same subframe.
  • the CQI and the RI may also be fed back or reported to the base station in different subframes.
  • the base station may be reported by a Physical Uplink Shared Channel (PUSCH) or a Physical Uplink Control Channel (PUCCH).
  • PUSCH Physical Uplink Shared Channel
  • PUCCH Physical Uplink Control Channel
  • the RI may be jointly encoded with the CQI.
  • the CQI may be jointly encoded with the PMI, and the RI may be reported in different subframes from the PMI and the CQI.
  • the user equipment receives a second reference signal set sent by the base station.
  • the second reference signal set may be the same or different reference signal set as the first reference signal set.
  • the user equipment receives, according to the second reference signal set and the second mapping of the codeword to the layer, the data sent by the base station, where the number of layers of the at least one codeword mapping in the first mapping of the codeword to the layer is The number of layers of the codeword mapping in the second mapping of the codeword to layer is less, the first mapping of the codeword to layer comprising a second mapping of at least one codeword and at least one of the transport layers.
  • the number of layers of the at least one codeword mapping in the first mapping of the codeword to the layer is smaller than the number of layers of the codeword mapping in the second mapping of the codeword to the layer
  • the second codeword is The number of layers of at least one codeword mapping in the layer map is greater than the number of layers of codeword mapping in the first mapping of codewords to layers.
  • the first mapping of the codeword to the layer and the layer mapping of the second codeword are allowed to have the same number of layers or ranks, but the second mapping of the codeword to the layer allows for a smaller number of maximum codewords, or codeword to layer.
  • the first map allows for more maximum codewords.
  • the first mapping of codewords to layers is shown in Table 1
  • the second mapping of codewords to layers is shown in Table 4.
  • the maximum number of codewords allowed in the former is 4, and the maximum number of codewords allowed in the latter is 2.
  • the number of layers used by the base station to send the data is less than or equal to the number of layers indicated by the RI, and the transmission mode (eg, modulation and coding mode) used by the base station to send the data is based on the base station.
  • the CQI is selected.
  • the base station may determine, according to the RI, a number of layers used to send the data, where the number of layers is less than or equal to the number of layers indicated by the RI, and the base station selects a corresponding modulation and coding mode according to the CQI. To generate the above data.
  • the foregoing data may be carried in a Physical Downlink Shared Channel (PDSCH) or a user-specific channel.
  • PDSCH Physical Downlink Shared Channel
  • step 104 may include: Obtaining a channel estimate based on the second reference signal set;
  • Data is received based on the channel estimate.
  • the receiving data process may include
  • the channel is equalized according to the receiver algorithm, and then demodulated and decoded according to the signal after equalization.
  • the channel estimation value of the user equipment on the resource unit REi may be represented as H (i), based on the channel estimation, the received signal may be represented as
  • H(i) is a matrix of NrXNt , ⁇ is the number of receiving antennas of the user equipment, ⁇ ⁇ is the number of transmitting antennas of the base station; y W is the receiving signal vector of the user equipment on the resource unit REi, W W is a resource a precoding matrix of ⁇ ⁇ xr used on unit REi, where r is the rank of the precoding matrix or the number of layers transmitted or the rank of transmission; X (i) is the symbol vector of the r dimension transmitted by the base station, n (i It is a measurement noise of the dimension, which may include thermal noise of the receiver and interference from within the cell or outside the cell; N is the number of resource units used to receive the data.
  • the precoding matrix W (i) may be notified by the base station to the user equipment by using a precoding matrix indication of the transmission, or the precoding matrix.
  • W W is predefined.
  • the signal received in this way can be equivalent to
  • the channel estimation value on the resource unit REi may be expressed as H i)
  • the received signal can be expressed as
  • W is a matrix of N R X f , N R is the number of receiving antennas of the user equipment, r is the number of layers of the transmission or the rank of transmission; y W is the reception of the N R dimension of the user equipment on the resource unit REi Signal vector; X (i) is the r-dimensional symbol vector transmitted by the base station, and n (i) is the measurement noise of the dimension, which may include the thermal noise of the receiver and the interference from within the cell or outside the cell; ⁇ ⁇ is the reception The number of resource units used by the data.
  • the number of layers of transmission or the rank of transmission or the rank r of the precoding matrix in the above formula may be The device is notified to the user equipment by using Downlink Control Information (DCI). It can also be predefined, or limited to 1 or 2 or 3 by higher layer signaling.
  • DCI Downlink Control Information
  • the symbol vector x (i) sent by REi can be expressed as
  • X (i) [ X (0)(i) X ")(i) ... X( R - "(i)] T
  • each codeword can be mapped to one layer or multiple layers, as shown in Table 3. It should be noted that the number of symbols transmitted per layer ⁇ 1 and the total number of REs used are n « B is equal.
  • the symbol d(Q) W in the first codeword is mapped to the first layer, that is, x ⁇ id ⁇ W ;
  • the user equipment receives the first reference signal set sent by the base station, obtains CSI including the RI and the CQI, and reports the CSI according to the first mapping of the first reference signal set and the codeword to the layer, and receives the data sent by the base station. Then, the second reference signal set and the codeword to the second mapping of the layer are received. Since the number of layers including at least one codeword mapping in the first mapping of the codeword to the layer is smaller than the number of layers in the second mapping of the codeword to the layer, the CQI and the data are obtained in the prior art. The mapping of the same codeword to the layer is used.
  • FIG. 2 is a schematic flowchart of another data transmission method according to an embodiment of the present invention. As shown in FIG. 2, the method includes the following steps:
  • the base station sends a first reference signal set to the user equipment.
  • the base station receives the CSI that is sent by the user equipment, including the RI and the CQI, where the CSI is obtained by the user equipment based on the first mapping signal set and the first mapping of the codeword to the layer, where
  • the first mapping of the codeword to the layer includes a first mapping of the at least one codeword and the at least one transport layer, the transport layer being a transport layer between the base station and the user equipment.
  • first reference signal set may refer to the description in the embodiment shown in FIG. 1, and the repeated description is not repeated herein.
  • the base station sends a second reference signal set to the user equipment.
  • the base station sends data to the user equipment based on a second mapping of a codeword to a layer, so that the user equipment receives the base station according to the second reference signal set and the second mapping of the codeword to layer. Transmitting the data, wherein the number of layers of the at least one codeword mapping in the first mapping of the codeword to the layer is less than the number of layers of the codeword mapping in the second mapping of the codeword to the layer, where The first mapping of the codeword to layer includes a second mapping of at least one codeword and at least one of the transport layers.
  • the number of layers used to send the data may be less than or equal to the number of layers indicated by the RI, and the transmission mode used by the data is sent (for example: modulation and coding mode) ) may be selected based on the CQI, such that step 204 transmits the data based on the number of layers less than or equal to the RI indication, and the equivalent SNR of the layer that can transmit the data according to the CQI, ie, each layer
  • the equivalent SNR is equal to the equivalent SNR of the corresponding codeword, so that the modulation coding of the above data can be completed based on the modulation and coding mode corresponding to the equivalent SNR of each layer.
  • the equivalent SNR may be mapped to the MCS index of the codeword according to a predetermined criterion.
  • each MCS index may correspond to a modulation mode and a channel coding rate.
  • the modulation mode corresponding to the MCSI index and the code rate of the channel coding the block error rate (BLER) under different SNR values can be obtained through link simulation. Therefore, corresponding to a modulation mode and an encoding code rate, a corresponding BLER curve can be obtained, and the curve can be Table storage over discrete values.
  • the SNR of each codeword can be mapped to an MCS index value according to predetermined criteria.
  • the predetermined criterion may be an efficiency maximization criterion that satisfies a target BLER less than a preset threshold, for example, the threshold may be 10%.
  • the corresponding MCS index can be obtained by searching a set of BLER curves. It can also be stored in the table according to the result of the search, so that the corresponding MCS index value can be obtained directly according to the equivalent SNR range of the codeword. For example, taking 29 MCS indexes as an example, different ESNRs may be quantized into MCS index values according to Table 5 according to the ESNR value range corresponding to each codeword. For example, according to Table 4, if the ESNR is in the interval [-1.324, -0.3461), the corresponding MCS index is 4, that is, if the ESNR satisfies - 1.324 ⁇ ESNR ⁇ - 0.3461, the corresponding MCS index is 4.
  • the MCS index corresponding to the foregoing codeword may be notified to the user equipment by using downlink control information. Furthermore, the number of layers to be transmitted may also be notified to the user equipment by using downlink control information. The number of layers transmitted can be Coding with the MCS index corresponding to the codeword. Specifically, the downlink control information may be sent to the user equipment by using a physical downlink control channel or an enhanced physical downlink control channel.
  • an equivalent SNR estimation value of each layer may be adjusted according to the actual number of layers transmitted and the rank indication i reported by the user equipment. For example, if the rank reported by the user equipment is RI and the actual number of layers transmitted is ⁇ , the equivalent SNR of each layer after adjustment is
  • the power of the layer corresponding to each user changes due to power allocation, and the equivalent SNRESNR' of the above layers corresponding to the user equipment (1) can be further adjusted to
  • g W is the power gain of the layer corresponding to the user equipment after multi-user pairing
  • the equivalent SNR estimate for the first layer is the equivalent SNR estimate for the first codeword.
  • the estimated SNR estimates are equal to the equivalent SNR estimate of the second codeword.
  • the number of layers including at least one codeword mapping in the first mapping of the codeword to the layer is smaller than the number of layers of the codeword mapping in the second mapping of the codeword to the layer.
  • the number of layers including at least one codeword mapping in the layer mapping of the two codewords is more than the number of layers of the codeword mapping in the first mapping of the codeword to the layer.
  • the first mapping of the codeword to the layer and the layer mapping of the second codeword are allowed to have the same number of layers or ranks, but the second mapping of the codeword to the layer allows for a smaller maximum number of codewords, or, the codeword to layer First A map allows for a maximum number of codewords.
  • the first mapping of codewords to layers is as shown in Table 1
  • the second mapping of codewords to layers is shown in Table 3.
  • the maximum number of codewords allowed in the former is 4, and the maximum number of codewords allowed in the latter is 2.
  • the first mapping of the codeword to the layer may include at least one of the following:
  • the first mapping of the above codewords to layers may include at least the following mapping:
  • N is the number of layers
  • N c W is the number of code words
  • X (Q) «, ⁇ (1) ⁇ , ⁇ (2) «, ⁇ (3) ⁇ are the symbols transmitted on each layer
  • d ( °) (i) , d(1)(i) , d( (i) , d( (i) are the symbols contained in each codeword
  • M b , M b , M s ( , M s ( y is the number of symbols transmitted by each layer respectively.
  • M b , M b , M s ( , M s ( y is the number of symbols transmitted by each layer respectively.
  • the method may further include:
  • the base station configures the first mapping or the second mapping of the codeword to the layer by using the signaling to the user equipment. That is, the first mapping or the second mapping of the above codeword to layer can be implemented by the base station.
  • the first mapping or the second mapping of the codeword to the layer may be specifically controlled by higher layer signaling, such as radio resources. (Radio Resource Control, RRC for short) signaling or dynamic signaling, such as Downlink Control Information (DCI), configures the first mapping or the second mapping of the codeword to a layer to a user equipment.
  • RRC Radio Resource Control
  • DCI Downlink Control Information
  • the step may be specifically performed before step 202.
  • the symbol sequence corresponding to each codeword is d (w ) (0), d- (l) 5
  • each codeword can be mapped to one layer or multiple layers, specifically, as shown in Table 3.
  • the symbol d(Q) W in the first codeword is mapped to the first layer, that is, x ⁇ id ⁇ W ;
  • the first codeword includes the symbols carried on the first layer of each resource unit, that is, x (°) (i), ⁇ ⁇ '-' ⁇ ⁇ " 1 ;
  • a first reference signal set such that the user equipment can obtain and report the CSI including the RI and the CQI based on the first reference signal set and the first mapping of the codeword to the layer
  • the CQI and the data obtained in the technology are the same Word-to-layer mapping, therefore, the CQI in the present invention reflects fewer layers than in the prior art, and when the number of layers reflected by the CQI is smaller, the channel quality corresponding to each layer can be better described. So that the base station can obtain finer channel quality information about the user equipment, so that the scheduling accuracy can be improved, in particular, the accuracy of the MCS used when transmitting data can be more accurately determined, and when the MU-MIMO transmission is implemented.
  • FIG. 3 is a schematic structural diagram of a user equipment according to an embodiment of the present invention. As shown in FIG. 3, the method includes: a receiving unit 31 and a sending unit 32, where:
  • the receiving unit 31 is configured to receive a first reference signal set sent by the base station.
  • the reference signal in the first reference signal set may be a cell-specific CRS; or the reference signal in the first reference signal set may be a CSI RS.
  • CRS in LTE R8 system or CSI RS in LTE R8 system may be a cell-specific CRS; or the reference signal in the first reference signal set may be a CSI RS.
  • the first reference signal set may include one or more reference signals.
  • the sending unit 32 is configured to obtain, according to the first mapping of the first reference signal set and the codeword to the layer, channel state information CSI including a rank indication RI and a channel quality indicator CQI, and send the CSI to the base station, where And the first mapping of the codeword to the layer includes a first mapping of the at least one codeword and the at least one transport layer, where the transport layer is a transport layer between the base station and the user equipment.
  • the sending unit 32 may be configured to obtain a channel estimation based on the first reference signal set, and obtain CSI including the RI and the CQI according to the channel estimation, and send the CSI to the base station.
  • the sending unit 32 reference may be made to step 102 in the embodiment shown in FIG. 1, which is not repeated here.
  • the first mapping of the above codewords to layers may also refer to the first mapping of codewords to layers introduced in the embodiment shown in FIG.
  • the receiving unit 31 is further configured to receive a second reference signal set sent by the base station.
  • the receiving unit 31 is further configured to receive, according to the second reference signal set and the second mapping of the codeword to the layer, the data sent by the base station, where the number of layers of the at least one codeword mapping in the first mapping of the codeword to the layer The number of layers of the codeword mapping in the second mapping of the codeword to layer is less, the first mapping of the codeword to layer comprising a second mapping of at least one codeword and at least one of the transport layers.
  • step 104 in the embodiment shown in FIG. 1, and the description is not repeated herein.
  • the number of layers used by the base station to send the data is less than or equal to the RI indication a number of layers, and a transmission mode (for example, a modulation coding mode) used by the base station to transmit the data is selected by the base station based on the CQI.
  • a transmission mode for example, a modulation coding mode
  • the first mapping of the codeword to the layer may include at least one of the following:
  • the first mapping of the codeword to the layer may include at least the following mapping:
  • N is the number of layers
  • N c W is the number of code words
  • X (Q) «, ⁇ (1) ⁇ , ⁇ (2) «, ⁇ (3) ⁇ are the symbols transmitted on each layer
  • d ( °) (i) , d(1)(i) , d( (i) , d( (i) are the symbols contained in each codeword
  • M b , M b , M s ( , M s ( y is the number of symbols transmitted by each layer respectively.
  • M b , M b , M s ( , M s ( y is the number of symbols transmitted by each layer respectively.
  • the first mapping or the second mapping of the codeword to the layer may be configured by the base station by using signaling. That is, the first mapping or the second mapping of the above codeword to layer can be implemented by the base station. The first mapping or the second mapping of the codeword to the layer may be specifically controlled by higher layer signaling, such as radio resources.
  • Radio Resource Control (RRC) signaling or dynamic signaling such as downlink control information
  • the user equipment receives the first reference signal set sent by the base station, and obtains CSI including the RI and the CQI based on the first mapping signal set and the first mapping of the codeword to the layer, and reports the CSI, where the CSI is The included CQI is obtained based on the first mapping of the codeword to the layer, and when the user equipment receives the data sent by the base station, it is obtained based on the second reference signal set and the second mapping of the codeword to the layer.
  • CSI Downlink Control Information
  • the CQI and the data are obtained in the prior art.
  • the mapping of the same codeword to the layer is used. Therefore, compared with the prior art, the CQI in the present invention reflects fewer layers, and when the number of layers reflected by the CQI is smaller, the channel quality corresponding to each layer can be more. The description is good, so that the base station can obtain finer channel quality information about the user equipment, thereby improving scheduling accuracy, in particular, more accurately determining the accuracy of the MCS used for transmitting data, and implementing MU-MIMO.
  • FIG. 4 is a schematic structural diagram of a base station according to an embodiment of the present invention. As shown in FIG. 4, the method includes: a sending unit 41 and a receiving unit 42, where:
  • the sending unit 41 is configured to send the first reference signal set to the user equipment.
  • the receiving unit 42 is configured to receive, by the user equipment, channel state information CSI, which includes a rank indication RI and a channel quality indicator CQI, where the CSI is based on the first reference signal set and the codeword to the user equipment. a first mapping of the layer, where the first mapping of the codeword to the layer includes a first mapping of the at least one codeword and the at least one transport layer, where the transport layer is between the base station and the user equipment Transport layer.
  • channel state information CSI which includes a rank indication RI and a channel quality indicator CQI
  • first reference signal set may refer to the description in the embodiment shown in FIG. 1, and the repeated description is not repeated herein.
  • the sending unit 41 is further configured to send the second reference signal set to the user equipment.
  • the sending unit 41 is further configured to send data to the user equipment based on the second mapping of the codeword to the layer, so that the user equipment receives the second mapping based on the second reference signal set and the codeword to layer.
  • the data sent by the base station where the number of layers of the at least one codeword mapping in the first mapping of the codeword to layer is less than the number of layers mapped in the second mapping of the codeword to layer
  • the first mapping of the codeword to layer includes a second mapping of at least one codeword and at least one of the transport layers.
  • various implementations of the sending unit 41 may refer to step 204 in the embodiment shown in FIG. 2, and the description is not repeated herein.
  • the number of layers used to send the data may be less than or equal to the number of layers indicated by the RI, and a transmission mode (for example, a modulation and coding mode) used to transmit the data may be selected based on the CQI.
  • a transmission mode for example, a modulation and coding mode
  • the first mapping of the codeword to the layer may include at least one of the following:
  • the first mapping of the above codewords to layers may include at least the following mapping:
  • N is the number of layers
  • N c W is the number of code words
  • X (Q) «, ⁇ (1) ⁇ , ⁇ (2) «, ⁇ (3) ⁇ are the symbols transmitted on each layer
  • d ( °) (i) , d(1)(i) , d( (i) , d( (i) are the symbols contained in each codeword
  • M b , M b , M s ( , M s ( y is the number of symbols transmitted by each layer respectively.
  • M b , M b , M s ( , M s ( y is the number of symbols transmitted by each layer respectively.
  • the base station may further include:
  • the configuration unit 43 is configured to configure, by using signaling, the first mapping of the codeword to the layer by using the user equipment. Or the second mapping of the codeword to the layer. That is, the first mapping of the above codeword to layer or the second mapping of the codeword to layer can be implemented by the base station.
  • the first mapping of the codeword to the layer or the second mapping of the codeword to the layer may be specifically sent to the user equipment by using high layer signaling, such as RRC signaling or dynamic signaling, such as DCI.
  • the base station sends the first reference signal set to the user equipment, so that the user equipment can obtain and report the CSI including the RI and the CQI based on the first reference signal set and the first mapping of the codeword to the layer, where the CSI is The CQI is obtained based on the first mapping of the codeword to the layer, the base station transmits a second reference signal set to the user equipment, and transmits data based on the second mapping of the codeword to the layer. Since the number of layers including at least one codeword mapping in the first mapping of the codeword to the layer is smaller than the number of layers in the second mapping of the codeword to the layer, the CQI and the data are obtained in the prior art. The mapping of the same codeword to the layer is used.
  • FIG. 6 is a schematic structural diagram of another user equipment according to an embodiment of the present invention. As shown in FIG. 6, the method includes: a receiver 61, a processor 62, and a transmitter 63, where:
  • a receiver 61 configured to receive a first reference signal set sent by the base station
  • the processor 62 is configured to obtain, according to the first mapping signal set and the first mapping of the codeword to the layer, channel state information CSI including a rank indication RI and a channel quality indicator CQI, where the codeword reaches a layer first Mapping a first mapping comprising at least one codeword and at least one transport layer, the transport layer being a transport layer between the base station and the user equipment;
  • the transmitter 63 is configured to send the CSI to the base station
  • the receiver 61 is further configured to receive a second reference signal set sent by the base station;
  • the receiver 61 is further configured to receive data sent by the base station according to the second reference signal set and the second mapping of the codeword to the layer, where the codeword is mapped to at least one codeword in the first mapping of the layer.
  • the number of layers is less than the number of layers of the codeword mapping in the second mapping of the codeword to the layer, wherein the codeword is to the layer
  • the first mapping includes at least one codeword and a second mapping of at least one of the transport layers.
  • the number of layers used by the base station to send the data is less than or equal to the number of layers indicated by the RI, and the transmission mode (eg, modulation and coding mode) used by the base station to send the data is based on the base station.
  • the CQI is selected.
  • the first mapping of the codeword to the layer may include at least one of the following:
  • the first mapping of the codeword to the layer may include at least the following mapping:
  • N is the number of layers
  • N c W is the number of code words
  • X (Q) «, ⁇ (1) ⁇ , ⁇ (2) «, ⁇ (3) ⁇ are the symbols transmitted on each layer
  • d ( °) (i) , d(1)(i) , d( (i) , d( (i) are the symbols contained in each codeword
  • M b , M b , M s ( , M s ( y is the number of symbols transmitted by each layer respectively.
  • M b , M b , M s ( , M s ( y is the number of symbols transmitted by each layer respectively.
  • the first mapping of the codeword to the layer or the second mapping of the codeword to the layer may be configured by the base station by using signaling. That is, the first mapping of the above codeword to layer or the second mapping of the codeword to layer can be implemented by the base station.
  • the first mapping of the codeword to the layer or the second mapping of the codeword to the layer The mapping may be specifically through high layer signaling such as Radio Resource Control (RRC) signaling or dynamic signaling such as DCI notification.
  • RRC Radio Resource Control
  • the implementation of the first mapping of the codeword to the layer, the acquisition of the CQI, and the receiving of the data in the embodiment may refer to the embodiment in the embodiment shown in FIG. 1, and is not repeatedly described herein.
  • the user equipment receives the first reference signal set sent by the base station, and obtains and reports the CSI including the RI and the CQI based on the first reference signal set and the first mapping of the codeword to the layer, and when receiving the data sent by the base station, Obtained based on the second reference signal set and the second mapping of codewords to layers. Since the number of layers including at least one codeword mapping in the first mapping of the codeword to the layer is smaller than the number of layers in the second mapping of the codeword to the layer, the CQI and the data are obtained in the prior art. The mapping of the same codeword to the layer is used.
  • FIG. 7 is a schematic structural diagram of another base station according to an embodiment of the present invention. As shown in FIG. 7, the method includes: a transmitter 71 and a receiver 72, where:
  • a transmitter 71 configured to send a first reference signal set to the user equipment
  • the receiver 72 is configured to receive, by the user equipment, channel state information CSI, which includes a rank indication RI and a channel quality indicator CQI, where the CSI is based on the first reference signal set and the codeword by the user equipment. a first mapping of the layer, where the first mapping of the codeword to the layer includes a first mapping of the at least one codeword and the at least one transport layer, where the transport layer is between the base station and the user equipment Transport layer
  • the transmitter 71 is further configured to send a second reference signal set to the user equipment
  • the transmitter 71 is further configured to transmit data to the user equipment based on the second mapping of the codeword to the layer and through the transmitter 81, and send the data to the user equipment, so that the user equipment is based on the Receiving, by the second reference signal set and the second mapping of the codeword to the layer, the data sent by the base station,
  • the number of layers of the at least one codeword mapping in the first mapping of the codeword to the layer is less than the number of layers of the codeword mapping in the second mapping of the codeword to the layer, the codeword to the layer
  • a mapping includes a second mapping of at least one codeword and at least one of the transport layers.
  • the number of layers used to send the data may be less than or equal to the number of layers indicated by the RI, and a transmission mode (for example, a modulation and coding mode) used to transmit the data may be selected based on the CQI.
  • a transmission mode for example, a modulation and coding mode
  • the first mapping of the codeword to the layer may include at least one of the following:
  • the first mapping of the above codewords to layers may include at least the following mapping:
  • N is the number of layers
  • N c W is the number of code words
  • X (Q) «, ⁇ (1) ⁇ , ⁇ (2) «, ⁇ (3) ⁇ are the symbols transmitted on each layer
  • d ( °) (i) , d(1)(i) , d( (i) , d( (i) are the symbols contained in each codeword
  • the channel quality information can be indicated by more CQIs. Since the data transmission is scheduled by the base station according to the CQI fed back by the user equipment, more CQI information, corresponding to each layer The channel quality can be better described, so that the base station can obtain finer channel quality information about the user equipment, so that the scheduling accuracy can be improved, in particular, the modulation coding mode can be determined more accurately.
  • MU-MIMO transmission can improve the accuracy of CQI adjustment and increase the number of paired UE pairings, from And provide the throughput of the entire system.
  • the transmitter 71 is further configured to configure, by using the signaling, the first mapping of the codeword to the layer by the user equipment. That is, the first mapping of the above codeword to layer or the second mapping of the codeword to layer can be implemented by the base station.
  • the first mapping of the codeword to the layer or the second mapping of the codeword to the layer may be specifically sent to the user equipment by using high layer signaling, such as RRC signaling or dynamic signaling, such as DCI.
  • the first mapping of the codeword to the layer, the CQI, and the embodiment for transmitting the data in the embodiment may refer to the embodiment in the embodiment shown in FIG. 2.
  • the first reference signal set sent by the base station to the user equipment so that the user equipment can obtain and report the CSI including the RI and the CQI based on the first mapping signal set and the first mapping relationship of the codeword to the layer;
  • the user equipment transmits a second set of reference signals and transmits data based on the second mapping of the codewords to the layers. Since the number of layers including at least one codeword mapping in the first mapping of the codeword to the layer is smaller than the number of layers in the second mapping of the codeword to the layer, the CQI and the data are obtained in the prior art. The mapping of the same codeword to the layer is used.
  • the CQI in the present invention reflects fewer layers, and when the number of layers reflected by the CQI is smaller, the channel quality corresponding to each layer can be more. Good is described so that the base station can obtain finer channel quality information about the user equipment, thereby improving scheduling accuracy, in particular, improving the accuracy of the MCS used to transmit data, and improving CQI when implementing MU-MIMO transmission. Improve the accuracy of the adjustment and increase the number of paired user devices to increase system throughput.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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Abstract

本发明实施例公开了一种数据传输方法、用户设备和基站,该方法可包括:接收基站发送的第一参考信号集;基于第一参考信号集和码字到层的第一映射得到包括秩指示RI和信道质量指示CQI的CSI,并向基站发送CSI;接收基站发送的第二参考信号集;基于第二参考信号集和码字到层的第二映射接收基站发送的数据,其中,码字到层的第一映射中至少一个码字映射的层数比码字到层的第二映射中码字映射的层数要少。本发明实施例可以提高传输数据时采用的MCS的精度,以及提高通信系统的吞吐量。

Description

一种数据传输方法、 用户设备和基站
技术领域
本发明涉及通信领域, 尤其涉及一种数据传输方法、 用户设备和基站。 背景技术
现在通信系统广泛使用多天线, 以提高系统的容量或者改善用户的体验。 例如: 第三代合作伙伴计划 ( 3rd Generation Partnership Project, 3GPP ) 的长 期演进技术( Long Term Evolution, LTE ) R8系统可以支持 4个天线端口, LTE R10系统则可以支持 8个天线端口。 而现有的 LTE R10系统最多支持发送 2 个传输块( Transport Block, TB ), 每个 TB经过信道编码之后称之为一个码字 ( Codeword, CW )。 因此现在的系统需要将最多的 2个 CW映射到最多的 4 个层或者最多的 8个层。另外,现有的系统针对每个 CW反馈一个信道质量指 示( Channel Quality Indicator, CQI ), 其中, CQI可以用于表示该 CW对应的 TB利用数据信道传输时其误块率不小于指定的门限(如 10% ) 时所对应的调 制编码方式( Modulation Coding Scheme, MCS ), 而 CQI表示的 MCS会存 在一个等效信干噪比( Signal to Interference plus Noise Ratio, SINR ) 区间, 即 可以理解为每个 CQI对应一个 SINR区间。
由于现有的系统最多支持两个 CW, 且针对每个 CW只反馈一个 CQI, 而 信道传输时最多可以釆用 4或 8层, 这样就导致每个 CQI需要反映多个层的 信道质量, 而数据传输是基站根据用户设备反馈的 CQI进行调度的。 这样当 CQI反映的层数越多时, 调度的准确性就越低, 从而导致传输数据时釆用的 MCS的精度较低, 以及在实现多用户多输入多输出 ( Multi User Multiple Input Multiple Output, MU-MIMO )传输时用户设备配对越少, 从而导致通信系统 的吞吐量较低。 发明内容
本发明实施例提供了一种数据传输方法、用户设备和基站,可以提高传输 数据时釆用的 MCS的精度, 以及提高通信系统的吞吐量。
第一方面, 本发明实施例提供一种数据传输方法, 包括:
用户设备接收基站发送的第一参考信号集;
所述用户设备基于所述第一参考信号集和码字到层的第一映射得到包括 秩指示 RI和信道质量指示 CQI的信道状态信息 CSI, 并向所述基站发送所述 CSI, 其中, 所述码字到层的第一映射包含至少一个码字与至少一个传输层的 第一映射, 所述传输层为所述基站与所述用户设备之间的传输层;
所述用户设备接收基站发送的第二参考信号集;
所述用户设备基于所述第二参考信号集和码字到层的第二映射接收基站 发送的数据, 其中, 所述码字到层的第一映射中至少一个码字映射的层数比所 述码字到层的第二映射中码字映射的层数要少, 其中, 所述码字到层的第一映 射包含至少一个码字与至少一个所述传输层的第二映射。
在第一方面的第一种可能的实现方式中,所述码字到层的第一映射包括如 下至少一项:
三个码字与三个层的映射, 其中, 一个码字只允许映射到一个层; 以及 四个码字与四个层的映射, 其中, 一个码字只允许映射到一个层。
结合第一方面的第一种可能的实现方式,在第一方面的第二种可能的实现 方式中, 所述码字到层的第一映射至少包括如下映射:
Figure imgf000003_0001
其中, N 表示层数, Ncw表示码字数, 《、 χ(1)ω、 χ(2)«、 χ(3)ω分别为各层 上传输的符号, d(°)(i)d(1)(i)d( (i)d( (i)分别为各码字包含的符号, MsymbΛ M/Γs(y1m)b、 Msymb、 Μ 分别为各层传输的符号数。 结合第一方面的上述任一实现方式,在第一方面的第三种可能的实现方式 中,所述码字到层的第一映射或者所述码字到层的第二映射由所述基站通过信 令配置的。
第二方面, 本发明实施例提供一种数据传输方法, 包括:
基站向用户设备发送第一参考信号集;
所述基站接收所述用户设备发送的包括秩指示 RI和信道质量指示 CQI的 信道状态信息 CSI, 其中, 所述 CSI是所述用户设备基于所述第一参考信号集 和码字到层的第一映射得到的, 其中, 所述码字到层的第一映射包含至少一个 码字与至少一个传输层的第一映射,所述传输层为所述基站与所述用户设备之 间的传输层;
所述基站向所述用户设备发送第二参考信号集;
所述基站基于码字到层的第二映射向所述用户设备发送的数据,以便于所 述用户设备基于所述第二参考信号集和所述码字到层的第二映射接收所述基 站发送的所述数据, 其中, 所述码字到层的第一映射中至少一个码字映射的层 数比所述码字到层的第二映射中码字映射的层数要少,所述码字到层的第一映 射包含至少一个码字与至少一个所述传输层的第二映射。
在第二方面的第一种可能的实现方式中,所述码字到层的第一映射包括如 下至少一项:
三个码字与三个层的映射, 其中, 一个码字只允许映射到一个层; 以及 四个码字与四个层的映射, 其中, 一个码字只允许映射到一个层。
结合第二方面的第一种可能的实现方式,在第二方面的第二种可能的实现 方式中, 所述码字到层的第一映射至少包括如下映射:
Figure imgf000004_0001
x(0>(i) = d(0>(i)
x(1>(i) = d(1>(i)
4 4 Mlayar =Mm =M(1) =M(2) =M(3)
x(2'(i) = d(2'(i)
X(3' (i) = d(3' (i) 其中, N 表示层数, 表示码字数, 《、 χ(1)ω χ(2)« χ(3)ω分别为各层 上传输的符号, d(°)(i)d(1)(i)d( (i)d( (i)分别为各码字包含的符号,
Msymb Λ M/Γs(y1m)b Msymb Μ 分别为各层传输的符号数。 结合第二方面上述任一实现方式, 在第二方面的第三种可能的实现方式 中,通过信令给所述用户设备配置所述码字到层的第一映射或者所述码字到层 的第二映射。
第三方面,本发明提供一种用户设备, 包括:接收单元和发送单元,其中: 所述接收单元, 用于接收基站发送的第一参考信号集;
所述发送单元,用于基于所述第一参考信号集和码字到层的第一映射得到 包括秩指示 RI和信道质量指示 CQI的信道状态信息 CSI, 并向所述基站发送 所述 CSI, 其中, 所述码字到层的第一映射包含至少一个码字与至少一个传输 层的第一映射, 所述传输层为所述基站与所述用户设备之间的传输层;
所述接收单元还用于接收基站发送的第二参考信号集;
所述接收单元还用于基于所述第二参考信号集和码字到层的第二映射接 收基站发送的数据, 其中, 所述码字到层的第一映射中至少一个码字映射的层 数比所述码字到层的第二映射中码字映射的层数要少,其中, 所述码字到层的 第一映射包含至少一个码字与至少一个所述传输层的第二映射。
在第三方面的第一种可能的实现方式中,所述码字到层的第一映射包括如 下至少一项:
三个码字与三个层的映射, 其中, 一个码字只允许映射到一个层; 以及 四个码字与四个层的映射, 其中, 一个码字只允许映射到一个层。
结合第三方面的第一种可能的实现方式,在第三方面的第二种可能的实现 方式中, 所述码字到层的第一映射至少包括如下映射: 层数 码字数 码字到层的映射
N N丄、 cw i = 0,l"..,Ms — 1
x<0)(i) = d<0)(i)
3 3 x(')(i) = d(')(i)
X<2)(i) = d<2)(i) x(0>(i) = d(0>(i)
x(1>(i) = d(1>(i)
4 4 M<0) M<1) =M(2) =M<3)
x(2'(i) = d(2'(i)
x(3'(i) = d(3'(i) 其中, N 表示层数, NcW表示码字数, X (Q)«、 χ(1)ω、 χ(2)«、 χ(3)ω分别为各层 上传输的符号, d(°)(i)d(1)(i)d( (i)d( (i)分别为各码字包含的符号,
M b、 M b、 M^b、 Ms(y 分别为各层传输的符号数。 结合第三方面的上述任一实现方式,在第三方面的第三种可能的实现方式 中,所述码字到层的第一映射或者所述码字到层的第二映射由所述基站通过信 令配置的。
第四方面, 本发明提供一种基站, 包括: 发送单元和接收单元, 其中: 所述发送单元, 用于向用户设备发送第一参考信号集;
所述接收单元, 用于接收所述用户设备发送的包括秩指示 RI和信道质量 指示 CQI的信道状态信息 csi,其中,所述 csi是所述用户设备基于所述第一 参考信号集和码字到层的第一映射得到的, 其中, 所述码字到层的第一映射包 含至少一个码字与至少一个传输层的第一映射,所述传输层为所述基站与所述 用户设备之间的传输层;
所述发送单元还用于向所述用户设备发送第二参考信号集;
所述发送单元还用于基于码字到层的第二映射向所述用户设备发送的数 据,以便于所述用户设备基于所述第二参考信号集和所述码字到层的第二映射 接收所述基站发送的所述数据, 其中, 所述码字到层的第一映射中至少一个码 字映射的层数比所述码字到层的第二映射中码字映射的层数要少,所述码字到 层的第一映射包含至少一个码字与至少一个所述传输层的第二映射。
在第四方面的第一种可能的实现方式中,所述码字到层的第一映射包括如 下至少一项:
三个码字与三个层的映射, 其中, 一个码字只允许映射到一个层; 以及 四个码字与四个层的映射, 其中, 一个码字只允许映射到一个层。
结合第四方面的第一种可能的实现方式,在第四方面的第二种可能的实现 方式中, 所述码字到层的第一映射至少包括如下映射:
Figure imgf000007_0001
其中, N 表示层数, NcW表示码字数, X (Q)«、 χ(1)ω、 χ(2)«、 χ(3)ω分别为各层 上传输的符号, d(°)(i)d(1)(i)d( (i)d( (i)分别为各码字包含的符号,
M b、 M b、 Ms( 、 Ms(y 分别为各层传输的符号数。 结合第四方面上述任一实现方式, 在第四方面的第三种可能的实现方式 中, 所述基站还包括:
配置单元,用于通过信令给所述用户设备配置所述码字到层的第一映射或 者所述码字到层的第二映射。
第五方面, 本发明提供一种用户设备, 包括: 接收器、 处理器和发射器, 其中:
所述接收器, 用于接收基站发送的第一参考信号集;
所述处理器,用于基于所述第一参考信号集和码字到层的第一映射得到包 括秩指示 RI和信道质量指示 CQI的信道状态信息 CSI, 其中, 所述码字到层 的第一映射包含至少一个码字与至少一个传输层的第一映射,所述传输层为所 述基站与所述用户设备之间的传输层;
所述发射器, 用于向所述基站发送所述 CSI; 所述接收器还用于接收基站发送的第二参考信号集;
所述接收器还用于基于所述第二参考信号集和码字到层的第二映射接收 基站发送的数据,其中, 所述码字到层的第一映射中至少一个码字映射的层数 比所述码字到层的第二映射中码字映射的层数要少, 其中, 所述码字到层的第 一映射包含至少一个码字与至少一个所述传输层的第二映射。
在第五方面的第一种可能的实现方式中,所述码字到层的第一映射包括如 下至少一项:
三个码字与三个层的映射, 其中, 一个码字只允许映射到一个层; 以及 四个码字与四个层的映射, 其中, 一个码字只允许映射到一个层。
结合第五方面的第一种可能的实现方式,在第五方面的第二种可能的实现 方式中, 所述码字到层的第一映射至少包括如下映射:
Figure imgf000008_0001
其中, N 表示层数, NcW表示码字数, X (Q)«、 χ(1) ω、 χ(2) «、 χ(3) ω分别为各层 上传输的符号, d(°)(i)d(1)(i)d( (i)d( (i)分别为各码字包含的符号,
M b、 M b、 M^b、 Ms(y 分别为各层传输的符号数。 结合第五方面的上述任一实现方式,在第五方面的第三种可能的实现方式 中,所述码字到层的第一映射或者所述码字到层的第二映射由所述基站通过信 令配置的。
第六方面, 本发明提供一种基站, 包括: 发射器和接收器, 其中: 所述发射器, 用于向用户设备发送第一参考信号集;
所述接收器, 用于接收所述用户设备发送的包括秩指示 RI和信道质量指 示 CQI的信道状态信息 CSI,其中,所述 CSI是所述用户设备基于所述第一参 考信号集和码字到层的第一映射得到的, 其中, 所述码字到层的第一映射包含 至少一个码字与至少一个传输层的第一映射,所述传输层为所述基站与所述用 户设备之间的传输层;
所述发射器还用于向所述用户设备发送第二参考信号集;
所述发射器还用于基于码字到层的第二映射向所述用户设备发送的数据, 并向所述用户设备发送所述数据,以便于所述用户设备基于所述第二参考信号 集和所述码字到层的第二映射接收所述基站发送的所述数据, 其中, 所述码字 到层的第一映射中至少一个码字映射的层数比所述码字到层的第二映射中码 字映射的层数要少,所述码字到层的第一映射包含至少一个码字与至少一个所 述传输层的第二映射。
在第六方面的第一种可能的实现方式中,所述码字到层的第一映射包括如 下至少一项:
三个码字与三个层的映射, 其中, 一个码字只允许映射到一个层; 以及 四个码字与四个层的映射, 其中, 一个码字只允许映射到一个层。
结合第六方面的第一种可能的实现方式,在第六方面的第二种可能的实现 方式中, 所述码字到层的第一映射至少包括如下映射:
Figure imgf000009_0001
其中, N 表示层数, Ncw表示码字数, 《、 χ«ω、 χ'2'«、 χ'3'«分别为各层 上传输的符号, d(°)(i)d(1)(i)d( (i)d( (i)分别为各码字包含的符号,
M b、 M b、 M^b、 Ms(y 分别为各层传输的符号数。 结合第六方面上述任一实现方式, 在第六方面的第三种可能的实现方式 中,所述发射器还用于通过信令给所述用户设备配置所述码字到层的第一映射 或者所述码字到层的第二映射。
上述技术方案中, 用户设备接收基站发送的第一参考信号集, 用户设备基 于第一参考信号集和码字到层的第一映射得到包括 RI和 CQI的 CSI, 再向基 站发送该 CSI, 而接收基站发送的数据时, 是基于第二参考信号集和码字到层 的第二映射接收的。由于码字到层的第一映射中至少包括一个码字映射的层数 比码字到层的第二映射中码字映射的层数要少, 而现有技术中得到 CQI和数 据都是釆用同一个码字到层的映射, 相比现有技术, 本发明中的 CQI反映的 层数会更少, 而当 CQI反映的层数越少时, 各个层对应的信道质量可以更好 的被描述,使得基站可以获取关于用户设备的更精细的信道质量信息,从而提 高调度的准确性, 特别是提高传输数据时确定 MCS 的精度, 以及在实现 MU-MIMO传输时可以改进 CQI调整的准确性和提高配对用户设备的数目, 从而提高系统的吞吐量。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施 例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地, 下面描述 中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付 出创造性劳动的前提下, 还可以根据这些附图获得其他的附图。
图 1是本发明实施例提供的一种数据传输方法的流程示意图;
图 2是本发明实施例提供的另一种数据传输方法的流程示意图; 图 3是本发明实施例提供的一种用户设备的结构示意图;
图 4是本发明实施例提供的一种基站的结构示意图;
图 5是本发明实施例提供的另一种基站的结构示意图;
图 6是本发明实施例提供的另一种用户设备的结构示意图;
图 7是本发明实施例提供的另一种基站的结构示意图。 具体实施方式 下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清 楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明一部分实施例, 而不是 全部的实施例。基于本发明中的实施例, 本领域普通技术人员在没有作出创造 性劳动前提下所获得的所有其他实施例, 都属于本发明保护的范围。
本发明实施介绍的方法、用户设备和基站都可以应用于各种通信系统,例 如: 全球移动通信系统 ( Global System of Mobile communication, GSM ), 码 分多址( Code Division Multiple Access , CDMA )系统,宽带码分多址( Wideband Code Division Multiple Access Wireless , WCDMA ),通用分组无线业务( General Packet Radio Service, GPRS ), 长期演进( Long Term Evolution, LTE )等。
另夕卜, 用户设备(User Equipment, UE ), 也可称之为移动终端 (Mobile Terminal ), 移动用户设备等, 可以经无线接入网 (例如, RAN, Radio Access Network ) 与一个或多个核心网进行通信, 用户设备可以是移动终端, 如移动 电话(或称为 "蜂窝" 电话)和具有移动终端的计算机, 例如, 可以是便携式、 袖珍式、 手持式、 计算机内置的或者车载的移动装置; 用户设备还可以是中继 ( Relay ); 它们与无线接入网交换语言和 /或数据。
另外, 基站可以是 GSM 或 CDMA 中的基站 (BTS, Base Transceiver Station ), 也可以是 WCDMA中的基站( NodeB ), 还可以是 LTE中的演进型 节点 B ( eNB或 e-NodeB, evolved Node B )或者中继 ( Relay ), 本发明实施 例并不限定。
请参阅图 1,图 1是本发明实施例提供的一种数据传输方法的流程示意图, 如图 1所示, 包括以下步骤:
101、 用户终端接收基站发送的第一参考信号集。
可选的, 上述第一参考信号集中的参考信号可以是小区特定的参考信号
( Cell specific Reference Signal, CRS );或者上述第一参考信号集中的参考信号 可以是信道状态信息参考信号 ( Channel State Information Reference Signal, CSI RS )。 例如 LTE R8 系统中的 CRS 或者 LTE R8 系统中的 CSI RS。 另外, 上 述第一参考信号集可以包括一个或者多个参考信号。
102、 用户基于所述第一参考信号集和码字到层的第一映射得到包括 RI 和 CQI的 CSI, 并向所述基站发送所述 CSI, 其中, 其中, 所述码字到层的第 一映射包含至少一个码字与至少一个传输层的第一映射,所述传输层为所述基 站与所述用户设备之间的传输层。
可选的, 步骤 102可以包括:
基于所述第一参考信号集, 得到信道估计;
根据所述信道估计, 得到包括 RI和 CQI的 CSI, 并向基站发送该 CSI, 其中, CQI是基于上述码字到层的第一映射得到的。
进一步地, 所述 CSI 还可以包括预编码矩阵指示 (Precoding Matrix Indicator Index, PMI )。
可选的, 得到 RI和 CSI的步骤可以参考如下步骤:
A )基于第一参考信号集, 得到信道估计;
B )根据系统的方程和信道估计选择得到用户设备最优的秩 r* ; 该最优的 秩 r*可以为上述 RI;
C )根据上述秩 r*可以得到传输数据所釆用的传输层的层数, 以及得到各 个资源单元在各层上传输的符号的 SINR, 即得到各个资源单元的各个符号的 SINR;
D )根据码字到层的第一映射关系就可以得到各码字的各符号的 SINR, 其中;
E )将码字中所有符号的 SINR映射为一个等效 SNR。 这样一个码字可以 得到一个等效 SNR 即 ESNR, 与每个码字对应的 ESNR 可以称之为码字的 SNR。 而一个 SNR可以量化为一个 CQI, 这样就可以得到该码字的 CQI, 从 而可以生成上述 CSI。
其中, 上述步骤具体说明与举例请可以参考下述说明, 另外, 各层上传输 的符号可以是理解基站向用户设备发送信号过程中各层上传输的符号, 例如: 基站发送的信号为 x(i) = [x(°)(i) χ(1)(ϊ) ··· χ- (ϊ)]τ , 其中, r表示釆用的层数, 《、 x(')(i)...x('- ')«分别表示第一层、 第二层和第 (f "层上传输的符号。 另外, 一个 码字可以是包含多个符号,且一个码字包含的多个符号可以是在不同的层上传 输, 具体请见本实施例提供的码字到层的第一映射和码字到层的第二映射。
上述信道估计可以是上述第一参考信号集所用的资源单元 (Resource Element, RE )上的信道估计。 例如: 可以基于所述第一参考信号集可以利用 最小二乘 (Least Squared, LS)方法或者最小均方误差 ( Minimum Mean Squared Error, MMSE )准则得到信道估计值。 通常利用 LS方法可以直接得到参考信 号所用的上的信道估计值, 利用 MMSE方法做内插或者外推, 可以得到一个 或者多个资源块( Resource Block, RB ) 内各个 RE上的信道估计值。
下面以 REi (即序号为 i的 RE )进行举例说明, 其中, REi上的信道估计 值可以表示为 H(i), 则基于该信道估计, 使用波束赋形或者预编码的 MIMO 系统, 该系统的方程可以 示为
Figure imgf000013_0001
其中, H(i)为一个 N 的矩阵 , 为用户设备的接收天线数, Ντ为基 站的发射天线数; y(i)是用户设备在 REi上^维的接收信号矢量, W(i)是 REi 上所用的^ 的预编码矩阵, 其中 r为所述预编码矩阵的秩; X(i)是基站发送 的 r维的符号矢量, n(i)为 ^维的测量噪声, 该测量噪声可以包括接收机的热 噪声以及来自小区内或者小区外的干扰; N 为所用的资源单元数。
可选的, 上述预编码矩阵 W(i)可以从一个码本 C中选择, 所述码本 C可以 配置在用户设备和基站中, 为双方所共知, 基站可以通过高层信令如 RRC信 令可以限制用户设备可以选择或者使用的为码本的子集。
可选的, 上述预编码矩阵 WW可以是预定义的, 为用户设备和基站所共 知。 具体地, 用户设备所选择的预编码矩阵w(i)可以根据所使用的资源单元 或者天线端口或者秩 r确定。 例如, 预编码矩阵 W(i)预编码矩阵根据如以下 公式进行选择
W(i) = Pk(
其中,
Figure imgf000013_0002
由秩 r的预编码矩阵组成, k 为所用的码本或者码本子集中预编码矩阵的指示或者索引, 是码本或者码 本子集 CW中与索引或者指示 k对应的预编码矩阵, N 是码本或者码本子集 C(t)的大小, 即 ^^中预编码矩阵的总数。
需要进一步指出的是, 对于给定的秩 r, 其预编码矩阵的选择可以预定义 的, 例如可以按照上述两个公式进行选择,从而使得所述用户设备不必反馈或 者上报所述预编码矩阵指示 k, 但是秩 r选择仍然可以由用户设备基于其得到 的信道估计得到。
可选的, 基于所得到信道估计值, 用户设备可以根据上述系统方程, 以及 根据各个不同秩 r的取值条件下预编码矩阵的预定义的选择方法, 以及根据预 定义的准则, 选择得到用户设备最优的秩 r*。 其中, 最优的秩 r*还可以通过述 容量最大化准则、吞吐量最大化准则或者互信息最大化等准则选择,对此本发 明对此不做限定。 另外, 上述最优的秩 r*可以作为上述 CSI中的 RI。
当秩 r和预编码矩阵指示 k已知后, 就可以根据上述系统方程得到 REi在 各个层对应的信干噪比 S1^^) . l = 0,l, r -l,其中 W(i) = Pk(r),预编码矩阵 Pk W 为码本或者码本子集 CW中的一个预编码矩阵。 根据所使用的接收机, 根据上 述系统方程就可以得到 REi在各个层对应的信干噪比 8ΙΝ1^ )。
上述 CQI基于码字到层的第一映射得到可以 Ncw个码字和N 个层为例 进行举例说明, 其中, 每个码字含有的符号数分别为^ 二。,…^^—1, 每 个码字对应的符号序列分别为 d(w) (0)d(w, « , ..., «1- w = 0,..., Ncw -l . 层数N 与所使用的秩指示相等。 REi发送的符号矢量 可 以表示为
X(i) = [x(°) (i) x« (i) … X(r- "(i)]T
其中,在码字到层的第一映射中,每个码字可以映射到一个层或者多个层, 具体地, 例如, 码字到层的第一映射可以如表 1所示。 需要指出的是, 其中每 层传输的符号数 与使用的 RE总数 n«B相等。
Figure imgf000015_0001
在表 1表示的第一码字到层的第一映射关系中可以包括如下至少一项: 三个码字与三个层的映射, 其中, 一个码字只允许映射到一个层; 以及 四个码字与四个层的映射, 其中, 一个码字只允许映射到一个层。 每个码字可以按照顺序依次映射到对应的层,码字所映射到的层的索引值 与码字的索引值相等。 例如: 在三个码字中, 第一个码字可以映射到第一层, 第二个码字可以映射到第二层, 第三个码字可以映射到第三层;
每个码字可以按照顺序依次映射到对应的层,各个码字所映射到的层的索 字可以映射到第二层, 第二个码字可以映射到第三层, 第三个码字可以映射到 第一层; 其中序列 2, 3, 1是序列 1, 2, 3的循环移位; 再例如, 第一个码字 可以映射到第三层, 第二个码字可以映射到第一层, 第三个码字可以映射到第 二层等。 其中序列 3, 1, 2是序列 1, 2, 3的循环移位;
另外, 上述码字到层的第一映射至少可以包括如下映射:
表 2:
Figure imgf000016_0001
其中, N 表示层数, NcW表示码字数, X (Q)«、 χ(1) ω、 χ(2) «、 χ(3) ω分别为各层 上传输的符号, d(°)(i)d(1)(i)d( (i)d( (i)分别为各码字包含的符号,
M b、 M b、 M^b、 Ms(y 分别为各层传输的符号数。 这样可以实现每个码字对应的 CQI反映的层数可以为一层, 从而可以使 CQI反映更少层数的传输, 因此, 在相同层数或者秩的条件下, 信道质量信息 可以通过更多的 CQI指示。 由于数据传输通过基站根据用户设备反馈的 CQI 进行调度, 更多的 CQI信息, 各个层对应的信道质量可以更好的被描述, 使 得基站可以获取关于用户设备的更精细的信道质量信息,从而可以提高调度的 准确性, 特别是可以更为精确的确定调制编码方式, 另一方面, 在实现 MU-MIMO传输时可以改进 CQI调整的准确性和提高配对 UE的数量,从而提 高整个系统的吞吐量。
可选的,所述码字到层的第一映射或者所述码字到层的第二映射由所述基 站通过信令配置的。即可以实现上述码字到层的第一映射或者所述码字到层的 第二映射由基站设定。所述码字到层的第一映射或者所述码字到层的第二映射 具体可以是通过高层信令如无线资源控制 ( Radio Resource Control, RRC ) 信令或者动态信令如 DCI配置的。 另外, 该步骤具体可以是在步骤 102之前 执行。
具体地, 以码字到层的第一映射为例,码字到层的第一映射可以包含多个 形式类似表 2的不同表格, 所述不同的表格可以通过不同的索引指示。 例如, 可以包含 2或者 4或者 8个表格, 与之对应, 这些表格可以用 1或 2或 3比特 指示。 所述索引或者指示信息可以通过上述 RRC信令或者 DCI信息发送给用 户设备。
针对表 1, 以两个码字和三个层即 =2和^^=3为例, 第一个码字中 的符号 d(Q)(i)映射到第一层, 即 x^i^d^ ; 第二个码字中的符号 d("(i)映射到 第二层和第三层, 即 xw(i) = dw(2i), x(2)(i) = d(1)(2i + l)o 此时, 第一个码字包括各 个资源单元上第一层上承载的符号, 即 x (i), ί = 0,···,Μ - 1; 第二个码字包 括各个资源单元上第二层和第三层上承载的符号, 即 x("(i)和 x( (i), ί=0,···,Μ — 1。 以三个码字和三个层即 =3和 ^ =3为例, 第一个码字中的符号 d(Q)(i) 映射到第一层, 即 x(Q)(i) = d(())(i) ; 第二个码字中的符号 d("(i)和第三个码字中的 符号 d( (i)分别映射到第二层和第三层, 即 xW(i) = dw(i), x( (i) = d(2)(i)。 此时, 第 1个码字包括各个资源单元上第 1层上承载的符号,即 x(1— "(i), ί = 0,···,Μ _1, 1 = 1,2,3。 与前面秩选择过程类似的方法,不管预编码矩阵是预定义的还是用户设备 选择的, 在得到最优选择的秩 r*条件下, 用户设备可以得到各个资源单元 REi 上各个层的 siNR即 δΙΝ1?)ω, 1=0,··· -1。 等价地, 与之对应地, 资源单元
REi 上发送的符号矢量 中的各个符号 X(1)W对应的 SINR 为 8ΙΝ1Ϋ^), l=0,...,r*-l? 其中
Figure imgf000018_0001
因此, 利用上述码字到层的第一映射, 可以得到各个码字中各个符号对应 的 S赚。
以表 1 所述的码字到层的第一映射为例, 易知, 当两个码字和三个层即 Ncw =2^ layer =3 Hj.5 第一个码字包括的各个符号的 SINR 为 SINR)'D)(i), i=0,-,M^-l. 第二个码字包括的各个符号的 SINR 为, 即 SI '"(i), ί=0,··',Μ - 1。 易知, 当三个码字和三个层即 ^ =3和^^„ =3时, 第一个码 字包括的各个符号的 SINR为 SINR)'°)(i), i = 0Μ^-χ ; 第二个码字中的符号 d(1)(i)和第三个码字中的符号 d( (i)分别映射到第二层和第三层,即 xW(i) = dW(i), X( (i) = d(2)(i)。 此时, 第 1个码字包括的各个符号的 SINR 为 SINf i), i=0,..., ¾— 1, 1 = 12,3。 另外,利用等效 SNR映射方法,可以将每个码字中包含的多个符号的 SINR 映射为一个等效 SNR, 即将每个码字中包含的多个符号的 SINR映射为一个 ESNR。 这样每个码字可以得到一个等效 SNR 即 ESNR, 与每个码字对应的 ESNR可以称之为码字的 SNR。 而每个码字的 SNR可以量化为一个 CQI。 例 如, 以 4比特的 CQI即 16个 CQI索引值为例进行举例说明, 即码字的 SNR 量化为 CQI可以参考表 3所示的关系。
表 3:
Figure imgf000019_0001
根据表 3将不同的 ESNR量化为 CQI索引值。 例如, 根据表 3, 如果某码 字的 SNR位于区间 [-5.108,-3.216)时, 那么该码字对应的 CQI为 2。 即如果某 码字的 SNR ^ -5.108≤ ESNR < -3.216, 则该码字对应得到 CQI为 2。
可选的,上述 CQI可以反映一个子带上的传输,这样可以称之为子带 CQI, 另外, 上述 CQI也可以反映系统带宽上的传输, 这样可以称之为宽带 CQI。
另外,还可以是在相同的子帧将所述 CQI与所述 RI反馈或者报告给基站, 也可以在不同的子帧将所述 CQI与所述 RI反馈或者报告给基站。 具体地, 可 以通过物理上行共享信道 ( Physical Uplink Shared Channel, PUSCH)或者物理 上行控制信道( Physical Uplink Control Channel, PUCCH)报告给基站。 当通过 PUCCH报告给基站时, 所述 RI可以与所述 CQI进行联合编码。 或者, 当通 过 PUCCH报告给基站时, 所述 CQI可以与 PMI进行联合编码, 所述 RI可以 与所述 PMI和 CQI在不同的子帧上报。
103、 用户设备接收基站发送的第二参考信号集。
可选的,上述第二参考信号集可以是与上述第一参考信号集相同或者不同 的参考信号集合。
104、 用户设备基于所述第二参考信号集和码字到层的第二映射接收基站 发送的数据, 其中, 所述码字到层的第一映射中至少一个码字映射的层数比所 述码字到层的第二映射中码字映射的层数要少,所述码字到层的第一映射包含 至少一个码字与至少一个所述传输层的第二映射。
上述码字到层的第一映射中至少一个码字映射的层数比所述码字到层的 第二映射中码字映射的层数要少可以理解为,所述第二码字到的层映射中至少 一个码字映射的层数比码字到层的第一映射中码字映射的层数更多。例如,码 字到层的第一映射和第二码字到的层映射容许的层数或者秩相同,但是码字到 层的第二映射容许的最大码字数更少, 或者,码字到层的第一映射容许的最大 码字数更多。 例如, 码字到层的第一映射如表 1所示,码字到层的第二映射如 表 4所示, 前者容许的最大码字数为 4, 后者容许的最大码字数为 2。
表 4:
Figure imgf000021_0001
可选的, 所述基站发送所述数据使用的层数小于或者等于所述 RI指示的 层数, 且所述基站发送所述数据使用的传输方式(例如: 调制编码方式)是所 述基站基于所述 CQI选择的。 例如, 基站接收到上述 CSI后, 就可以根据上 述 RI确定发送上述数据所使用的层数,该层数小于或者等于所述 RI指示的层 数, 以及基站根据上述 CQI选择对应的调制编码方式, 以生成上述数据。
可选的, 上述数据可以承载在物理下行共享信道 (Physical Downlink Shared Channel , PDSCH )或者用户专用的信道中。
可选的, 步骤 104可以包括: 基于所述第二参考信号集, 得到信道估计;
根据所述信道估计, 接收数据。
其中, 信道估计的计算方法可以参考前面描述, 此处不作重复说明。 可选的, 所述接收数据过程, 可以包括
根据接收机算法进行信道均衡, 再根据均衡之后的信号进行解调和译码 等。
下面对接收数据过程进行详细举例:
基于所述第二参考信号集,用户设备在资源单元 REi上的信道估计值可以 表示为 H(i), 则基于所述信道估计, 接收到的信号可以表示为
y(i) = H(i)W(i)x(i) + n(i),i=0,l,...,NRE-l
其中 H(i)为一个 NrXNt的矩阵 , ^为用户设备的接收天线数, Ντ为基站 的发射天线数; yW是用户设备在资源单元 REi上^维的接收信号矢量, WW 是资源单元 REi上所用的 Ντ xr的预编码矩阵,其中 r为所述预编码矩阵的秩或 者传输的层数或者传输的秩; X(i)是基站发送的 r维的符号矢量, n(i)为 ^维 的测量噪声, 其中可以包括接收机的热噪声以及来自小区内或者小区外的干 扰; N 为接收数据所用的资源单元数。 其中所述预编码矩阵 W(i)可以是基站 通过通知传输的预编码矩阵指示通知给用户设备的, 或者所述预编码矩阵
WW是预定义的。 这样接收到的信号可以等价于
y(i) = He(i)x(i) + n(i),i = 0,l,...,NRE-l
其中, He(i) = H(i)W(i)为一个 NrX1 "的矩阵。 或者,基于所述第二参考信号合,在资源单元 REi上的信道估计值可以表 示为 H i), 则基于所述信道估计, 接收到的信号可以表示为
y(i) = He(i)x(i) + n(i),i = 0,l,...,NRE-l
其中, W为一个 NR X f 的矩阵 , NR为用户设备的接收天线数, r为所 述传输的层数或者传输的秩; y W是用户设备在资源单元 REi上 NR维的接收信 号矢量; X(i)是基站发送的 r维的符号矢量, n(i)为 ^维的测量噪声, 其中可 以包括接收机的热噪声以及来自小区内或者小区外的干扰; Ν^为接收数据所 用的资源单元数。
其中, 上述公式中的传输的层数或者传输的秩或者预编码矩阵的秩 r可以 通过下行控制信息 ( Downlink Control Information, DCI)通知给用户设备, 也 可以是预定义的, 或者通过高层信令限制为 1或者 2或者 3等。
可选的, 在码字到层的第二映射中 N 个码字和 Nl 个传输层为例, 其 中每个码字含有的符号数分别为0= = ()''''^^— 每个码字对应的符号序 列分别为 d(W) (0), d(W, « , …, d (W) (M — , w = 0,...,NOT - i。 每个资源单元 REi发送的符号矢量 x(i)可以表示为
X(i) = [X(0)(i) X")(i) … X(R- "(i)]T
其中, = Νς„, 每个码字可以映射到一个层或者多个层, 具体地, 如表 3 所示。需要指出的是,其中每层传输的符号数^1 与使用的 RE总数 n«B相等。
如表 4所示, 以两个码字和三个层即 = 2和^^ =3为例, 第一个码字 中的符号 d(Q)W映射到第一层, 即 x^i d^W ; 第二个码字中的符号 d("(i)映射 到第二层和第三层, 即 《 = ^( , x(2)(i) = d(1>(2i + l) o 此时, 第一个码字包括 各个资源单元上第一层上承载的符号, 即 x(°)(i), ί = 0,···,Μ - 1 ; 第二个码字 包括各个资源单元上第二层和第三层上承载的符号, 即 x("(i)和 x( (i), ί =0,···,Μ -1。这样就可以根据上述码字到层的第二映射,对第一层上承载的 符号进行解调和译码得到第一个码字对应的信息,以及对第二层和第三层上承 载的符号进行解调和译码得到第二个码字对应的信息,这样就得到包括第一个 码字对应的信息和第二个码字对应的信息的上述数据。
上述技术方案中, 用户设备接收基站发送的第一参考信号集,基于第一参 考信号集和码字到层的第一映射得到包括 RI和 CQI的 CSI, 并报告 CSI, 而 接收基站发送的数据时, 则第二参考信号集和码字到层的第二映射接收。 由于 码字到层的第一映射中至少包括一个码字映射的层数比码字到层的第二映射 中码字映射的层数要少, 而现有技术中得到 CQI和数据都是釆用同一个码字 到层的映射, 因此, 相比现有技术, 本发明中的 CQI反映的层数会更少, 而 当 CQI反映的层数越少时, 各个层对应的信道质量可以更好的被描述, 使得 基站可以获取关于用户设备的更精细的信道质量信息, 从而提高调度的准确 性, 特别是提高传输数据时确定 MCS的精度, 以及在实现 MU-MIMO传输时 可以改进 CQI调整的准确性和提高配对用户设备的数目, 从而提高系统的吞 吐量。 请参阅图 2, 图 2是本发明实施例提供的另一种数据传输方法的流程示意 图, 如图 2所示, 包括以下步骤:
201、 基站向用户设备发送第一参考信号集。
202、 基站接收所述用户设备发送的包括 RI和 CQI的 CSI, 其中, 所述 CSI是所述用户设备基于所述第一参考信号集和码字到层的第一映射得到的, 其中,所述码字到层的第一映射包含至少一个码字与至少一个传输层的第一映 射, 所述传输层为所述基站与所述用户设备之间的传输层。
需要说明的是, 上述第一参考信号集、 CSI以及码字到层的第一映射可以 参考图 1所示的实施例中的描述, 此处不作重复说明。
203、 基站向所述用户设备发送第二参考信号集。
204、 基站基于码字到层的第二映射向所述用户设备发送的数据, 以便于 所述用户设备基于所述第二参考信号集和所述码字到层的第二映射接收所述 基站发送的所述数据, 其中, 所述码字到层的第一映射中至少一个码字映射的 层数比所述码字到层的第二映射中码字映射的层数要少, 其中, 所述码字到层 的第一映射包含至少一个码字与至少一个所述传输层的第二映射。
可选的, 由于步骤 202获取到上述 RI和 CQI, 上述发送所述数据使用的 层数可以小于或者等于所述 RI指示的层数, 且发送所述数据使用的传输方式 (例如: 调制编码方式 )可以是基于所述 CQI选择的, 这样步骤 204就基于 小于或者等于所述 RI指示的层数发送上述数据, 以及根据上述 CQI可以得发 送上述数据的层的等效 SNR, 即每个层的等效 SNR等于对应的码字的等效 SNR, 这样就可以基于各层的等效 SNR对应的调制编码方式完成上述数据的 调制编码。
可选的, 在得到码字的等效 SNR之后, 可以根据预定的准则, 将所述等 效 SNR映射到码字的 MCS索引。
可选的, 每个 MCS索引可以对应一个调制方式和信道编码的码率。 与之 相对应, 根据 MCSI索引对应的调制方式和信道编码的码率, 通过链路仿真, 可以得到不同 SNR对应的取值下的误块率 (Block Error Rate,, BLER)。 因此, 对应于一种调制方式和编码码率,可以得到对应的 BLER曲线,该曲线可以通 过离散取值的表格存储。
利用上述 BLER曲线的集合, 可以根据预定的准则, 将每个码字的 SNR 映射为一个 MCS索引值。 所述预定的准则可以是满足目标 BLER小于预设定 的门限条件下效率最大化准则, 例如所述门限可以是 10%。
根据预定的准则,可以通过搜索 BLER曲线的集合得到对应的 MCS索引。 也可以根据搜索的结果事先存储在表中, 从而便于直接根据码字的等效 SNR 范围得到对应的 MCS索引值。 例如, 以 29个 MCS索引为例, 可以根据每个 码字对应的 ESNR取值范围, 根据表 5将不同的 ESNR量化为 MCS索引值。 例如, 根据表 4, 如果 ESNR位于区间 [-1.324, -0.3461)时, 对应的 MCS索引 为 4, 即如果 ESNR满足- 1.324≤ESNR < - 0.3461, 对应的 MCS索引为 4。
表 5:
Figure imgf000026_0001
上述码字对应的 MCS索引可以通过下行控制信息通知给用户设备。此夕卜, 所述传输的层数也可以通过下行控制信息通知给用户设备。所述传输的层数可 以与所述码字对应的 MCS索引联合编码。 具体的, 所述下行控制信息可以通 过物理下行控制信道或者增强的物理下行控制信道发送给用户设备。
可选的,在步骤 204中可以根据所传输的实际层数 与用户设备上报的 秩指示 i, 调整各个层的等效 SNR估计值。 例如, 用户设备上报的秩指示为 RI , 传输的实际层数为^ , 则调整后每个层的等效 SNR为
ESNR'{1) = ESNR(1)+101og ,1=0,· • ' -1
Figure imgf000027_0001
其中, 调整前的等效 SNR ESNR(1)和调整后的等效 SNR ESNR'(1)整后的均 用 dB值表示。 易知, 如果传输层数等于秩指示, 则 ESNR'(1)=ESNR(1)
此外, 对于 MU-MIMO传输, 由于功率分配导致每个用户对应的层上功 率发生变化, 此时用户设备所对应的上述各个层的等效 SNRESNR'(1)还可以进 一步调整为
ESNR"(1) = ESNR'(1) +101og10(g(1)),l =0,···,Ν -1· 其中, gW为多用户配对之后用户设备对应的层上功率增益, 此处功率增 益为线性值。 易知,如果没有多用户配对或者功率发分配之后功率没有发生变 化, 则有 ESNRff(1) = ESNR'(1)
如表 1所示, 以两个码字和三个层即 =2和^ '=3为例, 第一个码字 映射到第一层; 第二个码字中的符号 d("(i)映射到第二层和第三层。 因此, 第 一层的等效 SNR估计值为第一个码字的等效 SNR估计值。第二层的等效 SNR 估计值和第二层的等效 SNR估计值均等于第二个码字的等效 SNR估计值。如 表 1所示, 以三个码字和三个层即 Ncw=:^oN =3为例, 由于每个码字都映 射为一个层, 因此, 每个层的等效 SNR估计值等于每个码字的等效 SNR估计 值。
可选的, 上述码字到层的第一映射中至少包括一个码字映射的层数比所述 码字到层的第二映射中码字映射的层数要少可以理解为,所述第二码字到的层 映射中至少包含一个码字映射的层数比码字到层的第一映射中码字映射的层 数更多。例如,码字到层的第一映射和第二码字到的层映射容许的层数或者秩 相同, 但是码字到层的第二映射容许的最大码字数更少, 或者, 码字到层的第 一映射容许的最大码字数更多。 例如, 码字到层的第一映射如表 1所示,码字 到层的第二映射如表 3所示, 前者容许的最大码字数为 4, 后者容许的最大码 字数为 2
可选的, 所述码字到层的第一映射可以包括如下至少一项:
三个码字与三个层的映射, 其中, 一个码字只允许映射到一个层; 以及 四个码字与四个层的映射, 其中, 一个码字只允许映射到一个层。
例如: 上述码字到层的第一映射至少可以包括如下映射:
Figure imgf000028_0001
其中, N 表示层数, NcW表示码字数, X (Q)«、 χ(1)ω、 χ(2)«、 χ(3)ω分别为各层 上传输的符号, d(°)(i)d(1)(i)d( (i)d( (i)分别为各码字包含的符号,
M b、 M b、 Ms( 、 Ms(y 分别为各层传输的符号数。 这样可以实现每个码字对应的 CQI反映的层数可以为一层, 从而可以使 CQI反映更少层数的传输, 因此, 在相同层数或者秩的条件下, 信道质量信息 可以通过更多的 CQI指示。 由于数据传输通过基站根据用户设备反馈的 CQI 进行调度, 更多的 CQI信息可以提高调度的准确性, 这样可以实现调制编码 方式可以更为精确的确定, 另一方面, 可以实现 MU-MIMO传输时更多的 UE 配对, 从而提供整个系统的吞吐量。
可选的, 所述方法还可以包括:
基站通过信令给所述用户设备配置所述码字到层的第一映射或者第二映 射。 即可以实现上述码字到层的第一映射或者第二映射由基站设定。 所述码字 到层的第一映射或者第二映射具体可以是通过高层信令如无线资源控制 ( Radio Resource Control, 简称 RRC )信令或者动态信令例如下行控制信息 ( Downlink Control Information, 简称 DCI ) 向用户设备配置所述码字到层的 第一映射或者第二映射。 另外, 该步骤具体可以是在步骤 202之前执行。
可选的, 上述基于码字到层的第二映射向所述用户设备发送的数据, 具体 地, N 个码字和 Νι 个传输层为例, 其中每个码字含有的符号数分别为 M- ,w = 0,..., N^w -l 5 每个码字对应的符号序列分别为 d(w) (0), d- (l) 5
(w) '(W) 1 \ f
lM — " , w = 0 ,Ncw -l。 每个资源单元 REi发送的符号矢量 x(i)可以如 式为
X(i) = [X(0)(i) X")(i) … X(r- "(i)]T
其中 τ = Νς, 每个码字可以映射到一个层或者多个层, 具体地, 如表 3所
layer , γ
示。 需要指出的是, 其中每层传输的符号数 与使用的 RE总数 n«B相等。 这样就实现将上述数据通过多个资源单元在多个层上发送。
如表 4所示, 以两个码字和三个层即 = 2和^^ =3为例, 第一个码字 中的符号 d(Q)W映射到第一层, 即 x^i d^W ; 第二个码字中的符号 d("(i)映射 到第二层和第三层, 即 Χα)ω = ( , x(2)(i) = d(1)(2i + l) o 此时, 第一个码字包括 各个资源单元上第一层上承载的符号, 即 x(°)(i), ^ Ο'-' Μ^ "1 ; 第二个码字 包括各个资源单元上第二层和第三层上承载的符号, 即 x("(i)和 x( (i), ί =0,···,Μ — 1。 上述技术方案中, 向用户设备发送的第一参考信号集,这样用户设备就可 以基于第一参考信号集和码字到层的第一映射得到并报告包含 RI和 CQI 的 CSI, 向用户设备发送第二参考信号集, 以及基于码字到层的第二映射发送数 据。由于码字到层的第一映射中至少包括一个码字映射的层数比码字到层的第 二映射中码字映射的层数要少, 而现有技术中得到 CQI和数据都是釆用同一 个码字到层的映射, 因此, 相比现有技术, 本发明中的 CQI反映的层数会更 少, 而当 CQI反映的层数越少时, 各个层对应的信道质量可以更好的被描述, 使得基站可以获取关于用户设备的更精细的信道质量信息,从而可以提高调度 的准确性, 特别是可以更为精确的确定传输数据时釆用的 MCS的精度, 以及 在实现 MU-MIMO传输时可以改进 CQI调整的准确性和提高配对用户设备的 数目, 从而提高通信系统的吞吐量。 下面为本发明装置实施例,本发明装置实施例用于执行本发明方法实施例 一至二实现的方法, 为了便于说明, 仅示出了与本发明实施例相关的部分, 具 体技术细节未揭示的, 请参照本发明实施例一和实施例二。 请参阅图 3, 图 3是本发明实施例提供的一种用户设备的结构示意图, 如 图 3所示, 包括: 接收单元 31和发送单元 32, 其中:
接收单元 31, 用于接收基站发送的第一参考信号集。
可选的, 上述第一参考信号集中的参考信号可以是小区特定的 CRS; 或 者上述第一参考信号集中的参考信号可以是 CSI RS。 例如 LTE R8 系统中的 CRS 或者 LTE R8 系统中的 CSI RS。 另外, 上述第一参考信号集可以包括一 个或者多个参考信号。
发送单元 32, 用于基于所述第一参考信号集和码字到层的第一映射得到 包括秩指示 RI和信道质量指示 CQI的信道状态信息 CSI, 并向所述基站发送 所述 CSI, 其中, 所述码字到层的第一映射包含至少一个码字与至少一个传输 层的第一映射, 所述传输层为所述基站与所述用户设备之间的传输层。
可选的,发送单元 32可以用于基于所述第一参考信号集,得到信道估计, 以及根据所述信道估计, 得到包括 RI和 CQI的 CSI, 并向基站发送该 CSI。 另外, 发送单元 32 的多种实施方式都可以参考图 1 所示的实施例中的步骤 102, 此处不作重复说明。 另外, 上述码字到层的第一映射也可以参考图 1所 示的实施例中介绍的码字到层的第一映射。
接收单元 31还用于接收基站发送的第二参考信号集。
接收单元 31还用于基于所述第二参考信号集和码字到层的第二映射接收 基站发送的数据,其中, 所述码字到层的第一映射中至少一个码字映射的层数 比所述码字到层的第二映射中码字映射的层数要少,所述码字到层的第一映射 包含至少一个码字与至少一个所述传输层的第二映射。
可选的, 接收单元 31还的多种实施方式都可以参考图 1所示的实施例中 的步骤 104, 此处不作重复说明。
可选的, 所述基站发送所述数据使用的层数小于或者等于所述 RI指示的 层数, 且所述基站发送所述数据使用的传输方式(例如: 调制编码方式)是所 述基站基于所述 CQI选择的。
所述码字到层的第一映射可以包括如下至少一项:
三个码字与三个层的映射, 其中, 一个码字只允许映射到一个层; 以及 四个码字与四个层的映射, 其中, 一个码字只允许映射到一个层。
另外, 上述码字到层的第一映射至少可以包括如下映射:
Figure imgf000031_0001
其中, N 表示层数, NcW表示码字数, X (Q)«、 χ(1)ω、 χ(2)«、 χ(3)ω分别为各层 上传输的符号, d(°)(i)d(1)(i)d( (i)d( (i)分别为各码字包含的符号,
M b、 M b、 Ms( 、 Ms(y 分别为各层传输的符号数。 这样可以实现每个码字对应的 CQI反映的层数可以为一层, 从而可以使 CQI反映更少层数的传输, 因此, 在相同层数或者秩的条件下, 信道质量信息 可以通过更多的 CQI指示。 由于数据传输通过基站根据用户设备反馈的 CQI 进行调度, 更多的 CQI信息可以提高调度的准确性, 这样可以实现调制编码 方式可以更为精确的确定, 另一方面, 可以实现 MU-MIMO传输时更多的 UE 配对, 从而提供整个系统的吞吐量。
可选的,所述码字到层的第一映射或者第二映射可以由所述基站通过信令 配置的。 即可以实现上述码字到层的第一映射或者第二映射由基站设定。所述 码字到层的第一映射或者第二映射具体可以是通过高层信令如无线资源控制
( Radio Resource Control, 简称 RRC )信令或者动态信令例如下行控制信息
( Downlink Control Information, 简称 DCI ) 配置的。 上述技术方案中, 用户设备接收基站发送的第一参考信号集, 并基于第一 参考信号集和码字到层的第一映射得到包括 RI和 CQI的 CSI, 并报告 CSI, 其中, 该 CSI中包含的 CQI基于码字到层的第一映射得到的, 而所述用户设 备接收基站发送的数据时, 基于第二参考信号集和码字到层的第二映射得到。 由于码字到层的第一映射中至少包括一个码字映射的层数比码字到层的第二 映射中码字映射的层数要少, 而现有技术中得到 CQI和数据都是釆用同一个 码字到层的映射, 因此, 相比现有技术, 本发明中的 CQI反映的层数会更少, 而当 CQI反映的层数越少时, 各个层对应的信道质量可以更好的被描述, 使 得基站可以获取关于用户设备的更精细的信道质量信息,从而可以提高调度的 准确性, 特别是可以更为精确的确定传输数据所用的 MCS的精度, 以及在实 现 MU-MIMO传输时可以改进 CQI调整的准确性和提高配对用户设备的数目, 从而提高整个系统的吞吐量。 请参阅图 4, 图 4是本发明实施例提供的一种基站的结构示意图, 如图 4 所示, 包括: 发送单元 41和接收单元 42, 其中:
发送单元 41, 用于向用户设备发送第一参考信号集。
接收单元 42, 用于接收所述用户设备发送的包括秩指示 RI和信道质量指 示 CQI的信道状态信息 CSI,其中,所述 CSI是所述用户设备基于所述第一参 考信号集和码字到层的第一映射得到的, 其中, 所述码字到层的第一映射包含 至少一个码字与至少一个传输层的第一映射,所述传输层为所述基站与所述用 户设备之间的传输层。
需要说明的是, 上述第一参考信号集、 CSI以及码字到层的第一映射可以 参考图 1所示的实施例中的描述, 此处不作重复说明。
发送单元 41还用于向所述用户设备发送第二参考信号集。
发送单元 41 还用于基于码字到层的第二映射向所述用户设备发送的数 据,以便于所述用户设备基于所述第二参考信号集和所述码字到层的第二映射 接收所述基站发送的所述数据, 其中, 所述码字到层的第一映射中至少一个码 字映射的层数比所述码字到层的第二映射中码字映射的层数要少, 其中, 所述 码字到层的第一映射包含至少一个码字与至少一个所述传输层的第二映射。 可选的, 发送单元 41的多种实施方式都可以参考图 2所示的实施例中的 步骤 204, 此处不作重复说明。
可选的, 上述发送所述数据使用的层数可以小于或者等于所述 RI指示的 层数, 且发送所述数据使用的传输方式(例如: 调制编码方式)可以是基于所 述 CQI选择的。
可选的, 所述码字到层的第一映射可以包括如下至少一项:
三个码字与三个层的映射, 其中, 一个码字只允许映射到一个层; 以及 四个码字与四个层的映射, 其中, 一个码字只允许映射到一个层。
例如: 上述码字到层的第一映射至少可以包括如下映射:
Figure imgf000033_0001
其中, N 表示层数, NcW表示码字数, X (Q)«、 χ(1)ω、 χ(2)«、 χ(3)ω分别为各层 上传输的符号, d(°)(i)d(1)(i)d( (i)d( (i)分别为各码字包含的符号,
M b、 M b、 Ms( 、 Ms(y 分别为各层传输的符号数。 这样可以实现每个码字对应的 CQI反映的层数可以为一层, 从而可以使 CQI反映更少层数的传输, 因此, 在相同层数或者秩的条件下, 信道质量信息 可以通过更多的 CQI指示。 由于数据传输通过基站根据用户设备反馈的 CQI 进行调度, 更多的 CQI信息可以提高调度的准确性, 这样可以实现调制编码 方式可以更为精确的确定, 另一方面, 可以实现 MU-MIMO传输时更多的 UE 配对, 从而提供整个系统的吞吐量。
可选的, 如图 5所示, 所述基站还可以包括:
配置单元 43, 用于通过信令给所述用户设备配置所述码字到层的第一映 射或者所述码字到层的第二映射。即可以实现上述码字到层的第一映射或者所 述码字到层的第二映射由基站设定。所述码字到层的第一映射或者所述码字到 层的第二映射具体可以是通过高层信令如 RRC信令或者动态信令如 DCI向用 户设备发送。
上述技术方案中,基站向用户设备发送第一参考信号集,使得用户设备可 以基于第一参考信号集和码字到层的第一映射得到并报告包含 RI和 CQI 的 CSI, 其中, 该 CSI中的 CQI基于码字到层的第一映射得到, 基站向用户设备 发送第二参考信号集, 以及基于码字到层的第二映射发送数据。 由于码字到层 的第一映射中至少包括一个码字映射的层数比码字到层的第二映射中码字映 射的层数要少, 而现有技术中得到 CQI和数据都是釆用同一个码字到层的映 射, 因此, 相比现有技术, 本发明中的 CQI反映的层数会更少, 而当 CQI反 映的层数越少时,各个层对应的信道质量可以更好的被描述,使得基站可以获 取关于用户设备的更精细的信道质量信息,从而可以提高调度的准确性,特别 是传输数据时釆用的 MCS 的精度, 以及在实现 MU-MIMO传输时可以改进 CQI调整的准确性和提高配对用户设备配对的数目,从而提高通信系统的吞吐 量。 请参阅图 6, 图 6是本发明实施例提供另一种用户设备的结构示意图, 如 图 6所示, 包括: 接收器 61、 处理器 62和发射器 63, 其中:
接收器 61, 用于接收基站发送的第一参考信号集;
处理器 62, 用于基于所述第一参考信号集和码字到层的第一映射得到包 括秩指示 RI和信道质量指示 CQI的信道状态信息 CSI, 其中, 所述码字到层 的第一映射包含至少一个码字与至少一个传输层的第一映射,所述传输层为所 述基站与所述用户设备之间的传输层;
所述发射器 63, 用于向所述基站发送所述 CSI;
所述接收器 61还用于接收基站发送的第二参考信号集;
所述接收器 61还用于基于所述第二参考信号集和码字到层的第二映射接 收基站发送的数据, 其中, 所述码字到层的第一映射中至少一个码字映射的层 数比所述码字到层的第二映射中码字映射的层数要少, 其中, 所述码字到层的 第一映射包含至少一个码字与至少一个所述传输层的第二映射。
可选的, 所述基站发送所述数据使用的层数小于或者等于所述 RI指示的 层数, 且所述基站发送所述数据使用的传输方式(例如: 调制编码方式)是所 述基站基于所述 CQI选择的。
所述码字到层的第一映射可以包括如下至少一项:
三个码字与三个层的映射, 其中, 一个码字只允许映射到一个层; 以及 四个码字与四个层的映射, 其中, 一个码字只允许映射到一个层。
另外, 上述码字到层的第一映射至少可以包括如下映射:
Figure imgf000035_0001
其中, N 表示层数, NcW表示码字数, X (Q)«、 χ(1)ω、 χ(2)«、 χ(3)ω分别为各层 上传输的符号, d(°)(i)d(1)(i)d( (i)d( (i)分别为各码字包含的符号,
M b、 M b、 Ms( 、 Ms(y 分别为各层传输的符号数。 这样可以实现每个码字对应的 CQI反映的层数可以为一层, 从而可以使 CQI反映更少层数的传输, 因此, 在相同层数或者秩的条件下, 信道质量信息 可以通过更多的 CQI指示。 由于数据传输通过基站根据用户设备反馈的 CQI 进行调度, 更多的 CQI信息可以提高调度的准确性, 这样可以实现调制编码 方式可以更为精确的确定, 另一方面, 可以实现 MU-MIMO传输时更多的 UE 配对, 从而提供整个系统的吞吐量。
可选的,所述码字到层的第一映射或所述码字到层的者第二映射可以由所 述基站通过信令配置的。即可以实现上述码字到层的第一映射或者所述码字到 层的第二映射由基站设定。所述码字到层的第一映射或者所述码字到层的第二 映射具体可以是通过高层信令如无线资源控制 (Radio Resource Control , RRC )信令或者动态信令如 DCI通知。
需要说明的是, 本实施例中的码字到层的第一映射、 获取 CQI, 以及接收 上述数据的实施方式都可以参考图 1所示的实施例中的实施方式,此处不作重 复说明。
上述技术方案中, 用户设备接收基站发送的第一参考信号集,基于第一参 考信号集和码字到层的第一映射得到并报告包含 RI和 CQI的 CSI, 而接收基 站发送的数据时,基于第二参考信号集和码字到层的第二映射得到。 由于码字 到层的第一映射中至少包括一个码字映射的层数比码字到层的第二映射中码 字映射的层数要少, 而现有技术中得到 CQI和数据都是釆用同一个码字到层 的映射, 因此, 相比现有技术,本发明中的 CQI反映的层数会更少, 而当 CQI 反映的层数越少时,各个层对应的信道质量可以更好的被描述,使得基站可以 获取关于用户设备的更精细的信道质量信息,从而可以提高调度的准确性,特 别是可以更为精确的确定传输数据时釆用的 MCS, 以及在实现 MU-MIMO传 输时可以改进 CQI调整的准确性和提高配对用户设备配对的数目, 从而可以 提高系统的吞吐量。 请参阅图 7, 图 7是本发明实施例提供另一种基站的结构示意图, 如图 7 所示, 包括: 发射器 71和接收器 72, 其中:
发射器 71, 用于向用户设备发送第一参考信号集;
接收器 72, 用于接收所述用户设备发送的包括秩指示 RI和信道质量指示 CQI的信道状态信息 CSI, 其中, 所述 CSI是所述用户设备基于所述第一参考 信号集和码字到层的第一映射得到的, 其中, 所述码字到层的第一映射包含至 少一个码字与至少一个传输层的第一映射,所述传输层为所述基站与所述用户 设备之间的传输层;
发射器 71还用于向所述用户设备发送第二参考信号集;
发射器 71还用于基于码字到层的第二映射并通过发射器 81向所述用户设 备发送的数据, 并向所述用户设备发送所述数据, 以便于所述用户设备基于所 述第二参考信号集和所述码字到层的第二映射接收所述基站发送的所述数据, 其中,所述码字到层的第一映射中至少一个码字映射的层数比所述码字到层的 第二映射中码字映射的层数要少,所述码字到层的第一映射包含至少一个码字 与至少一个所述传输层的第二映射。
可选的, 上述发送所述数据使用的层数可以小于或者等于所述 RI指示的 层数, 且发送所述数据使用的传输方式(例如: 调制编码方式)可以是基于所 述 CQI选择的。
可选的, 所述码字到层的第一映射可以包括如下至少一项:
三个码字与三个层的映射, 其中, 一个码字只允许映射到一个层; 以及 四个码字与四个层的映射, 其中, 一个码字只允许映射到一个层。
例如: 上述码字到层的第一映射至少可以包括如下映射:
Figure imgf000037_0001
其中, N 表示层数, NcW表示码字数, X (Q)«、 χ(1)ω、 χ(2)«、 χ(3)ω分别为各层 上传输的符号, d(°)(i)d(1)(i)d( (i)d( (i)分别为各码字包含的符号,
M b、 M b、 M^b、 Ms(y 分别为各层传输的符号数。 这样可以实现每个码字对应的 CQI反映的层数可以为一层, 从而可以使 CQI反映更少层数的传输, 因此, 在相同层数或者秩的条件下, 信道质量信息 可以通过更多的 CQI指示。 由于数据传输通过基站根据用户设备反馈的 CQI 进行调度, 更多的 CQI信息, 各个层对应的信道质量可以更好的被描述, 使 得基站可以获取关于用户设备的更精细的信道质量信息,从而可以提高调度的 准确性, 特别是可以更为精确的确定调制编码方式, 另一方面, 在实现
MU-MIMO传输时可以改进 CQI调整的准确性和提高配对 UE配对的数量,从 而提供整个系统的吞吐量。
可选的, 发射器 71还可以用于通过信令给所述用户设备配置所述码字到 层的第一映射。即可以实现上述码字到层的第一映射或者所述码字到层的第二 映射由基站设定。所述码字到层的第一映射或者所述码字到层的第二映射具体 可以是通过高层信令如 RRC信令或者动态信令如 DCI向用户设备发送。
需要说明的是, 本实施例中的码字到层的第一映射、 CQI以及发送上述数 据的实施方式, 都可以参考图 2所示的实施例中的实施方式。
上述技术方案中,基站向用户设备发送的第一参考信号集,使得所述用户 设备可以基于第一参考信号集和码字到层的第一映射关系得到并报告包含 RI 和 CQI的 CSI; 向用户设备发送第二参考信号集, 并基于码字到层的第二映射 发送数据。由于码字到层的第一映射中至少包括一个码字映射的层数比码字到 层的第二映射中码字映射的层数要少, 而现有技术中得到 CQI和数据都是釆 用同一个码字到层的映射, 因此, 相比现有技术, 本发明中的 CQI反映的层 数会更少, 而当 CQI反映的层数越少时, 各个层对应的信道质量可以更好的 被描述,使得基站可以获取关于用户设备的更精细的信道质量信息,从而提高 调度的准确性, 特别是提高传输数据时所用的 MCS 的精度, 以及在实现 MU-MIMO传输时可以改进 CQI调整的准确性和提高配对用户设备数量, 从 而提高系统的吞吐量。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程, 是可以通过计算机程序来指令相关的硬件来完成,所述的程序可存储于一计算 机可读取存储介质中,该程序在执行时,可包括如上述各方法的实施例的流程。 其中,所述的存储介质可为磁碟、光盘、只读存储记忆体(Read-Only Memory, ROM )或随机存取存储器 ( Random Access Memory, 简称 RAM )等。
以上所揭露的仅为本发明较佳实施例而已,当然不能以此来限定本发明之 权利范围,因此依本发明权利要求所作的等同变化,仍属本发明所涵盖的范围。

Claims

权 利 要 求
1、 一种数据传输方法, 其特征在于, 包括:
用户设备接收基站发送的第一参考信号集;
所述用户设备基于所述第一参考信号集和码字到层的第一映射得到包括 秩指示 RI和信道质量指示 CQI的信道状态信息 CSI, 并向所述基站发送所述 CSI, 其中, 所述码字到层的第一映射包含至少一个码字与至少一个传输层的 第一映射, 所述传输层为所述基站与所述用户设备之间的传输层;
所述用户设备接收基站发送的第二参考信号集;
所述用户设备基于所述第二参考信号集和码字到层的第二映射接收基站 发送的数据, 其中, 所述码字到层的第一映射中至少一个码字映射的层数比所 述码字到层的第二映射中码字映射的层数要少, 其中, 所述码字到层的第一映 射包含至少一个码字与至少一个所述传输层的第二映射。
2、 如权利要求 1所述的方法, 其特征在于, 所述码字到层的第一映射包 括如下至少一项:
三个码字与三个层的映射, 其中, 一个码字只允许映射到一个层; 以及 四个码字与四个层的映射, 其中, 一个码字只允许映射到一个层。
3、 如权利要求 2所述的方法, 其特征在于, 所述码字到层的第一映射至 少包括如下映射:
层数 码字数 码字到层的映射
N N丄、 ί = 0,1,-,Μ^-1
x<0)(i) = d<0)(i)
3 3 x(')(i) = d(')(i)
X(2)(i) = d(2)(i) x(0>(i) = d(0>(i)
x(1>(i) = d(1>(i)
4 4 x(2'(i) = d(2'(i)
x(3'(i) = d(3'(i) 其中, N 表示层数, NcW表示码字数, 《、 χ(1)ω、 χ(2)«、 χ(3)ω分别为各层 上传输的符号, d)(i)dW(i)d(2)(i)d<¾«分别为各码字包含的符号, Λ(1)
Msymb、 Msymb、 Msymb、 Μ 分别为各层传输的符号数。
4、 如权利要求 1-3 中任一项所述的方法, 其特征在于, 所述码字到层的 第一映射或者所述码字到层的第二映射由所述基站通过信令配置的。
5、 一种数据传输方法, 其特征在于, 包括:
基站向用户设备发送第一参考信号集;
所述基站接收所述用户设备发送的包括秩指示 RI和信道质量指示 CQI的 信道状态信息 CSI, 其中, 所述 CSI是所述用户设备基于所述第一参考信号集 和码字到层的第一映射得到的, 其中, 所述码字到层的第一映射包含至少一个 码字与至少一个传输层的第一映射,所述传输层为所述基站与所述用户设备之 间的传输层;
所述基站向所述用户设备发送第二参考信号集;
所述基站基于码字到层的第二映射向所述用户设备发送的数据,以便于所 述用户设备基于所述第二参考信号集和所述码字到层的第二映射接收所述基 站发送的所述数据, 其中, 所述码字到层的第一映射中至少一个码字映射的层 数比所述码字到层的第二映射中码字映射的层数要少,所述码字到层的第一映 射包含至少一个码字与至少一个所述传输层的第二映射。
6、 如权利要求 5所述的方法, 其特征在于, 所述码字到层的第一映射包 括如下至少一项:
三个码字与三个层的映射, 其中, 一个码字只允许映射到一个层; 以及 四个码字与四个层的映射, 其中, 一个码字只允许映射到一个层。
7、 如权利要求 6所述的方法, 其特征在于, 所述码字到层的第一映射至 少包括如下映射: 层数 码字数 码字到层的映射
N N丄、 cw i = 0,l"..,Ms — 1
x<0)(i) = d<0)(i)
3 3 x(')(i) = d(')(i)
X<2)(i) = d<2)(i) x(0>(i) = d(0>(i)
x(1>(i) = d(1>(i)
4 4 M<0) M<1) =M(2) =M<3)
x(2'(i) = d(2'(i)
x(3'(i) = d(3'(i) 其中, N 表示层数, NcW表示码字数, X (Q)«、 χ(1)ω、 χ(2)«、 χ(3)ω分别为各层 上传输的符号, d(°)(i)d(1)(i)d( (i)d( (i)分别为各码字包含的符号,
M b、 M b、 M^b、 Ms(y 分别为各层传输的符号数。
8、 如权利要求 5-7中任一项所述的方法, 其特征在于, 所述方法还包括: 所述基站通过信令给所述用户设备配置所述码字到层的第一映射或者所 述码字到层的第二映射。
9、 一种用户设备, 其特征在于, 包括: 接收单元和发送单元, 其中: 所述接收单元, 用于接收基站发送的第一参考信号集;
所述发送单元,用于基于所述第一参考信号集和码字到层的第一映射得到 包括秩指示 RI和信道质量指示 CQI的信道状态信息 CSI, 并向所述基站发送 所述 CSI, 其中, 所述码字到层的第一映射包含至少一个码字与至少一个传输 层的第一映射, 所述传输层为所述基站与所述用户设备之间的传输层;
所述接收单元还用于接收基站发送的第二参考信号集;
所述接收单元还用于基于所述第二参考信号集和码字到层的第二映射接 收基站发送的数据, 其中, 所述码字到层的第一映射中至少一个码字映射的层 数比所述码字到层的第二映射中码字映射的层数要少, 其中, 所述码字到层的 第一映射包含至少一个码字与至少一个所述传输层的第二映射。
10、 如权利要求 9所述的用户设备, 其特征在于, 所述码字到层的第一映 射包括如下至少一项:
三个码字与三个层的映射, 其中, 一个码字只允许映射到一个层; 以及 四个码字与四个层的映射, 其中, 一个码字只允许映射到一个层。
11、 如权利要求 10所述的用户设备, 其特征在于, 所述码字到层的第一 映射至少包括如下映射:
Figure imgf000042_0001
其中, N 表示层数, NcW表示码字数, X (Q)«、 χ(1)ω、 χ(2)«、 χ(3)ω分别为各层 上传输的符号, d(°)(i)d(1)(i)d( (i)d( (i)分别为各码字包含的符号,
M b、 M b、 Ms( 、 Ms(y 分别为各层传输的符号数。
12、 如权利要求 9-11 中任一项所述的用户设备, 其特征在于, 所述码字 到层的第一映射或者所述码字到层的第二映射由所述基站通过信令配置的。
13、 一种基站, 其特征在于, 包括: 发送单元和接收单元, 其中: 所述发送单元, 用于向用户设备发送第一参考信号集;
所述接收单元, 用于接收所述用户设备发送的包括秩指示 RI和信道质量 指示 CQI的信道状态信息 CSI,其中,所述 CSI是所述用户设备基于所述第一 参考信号集和码字到层的第一映射得到的,其中, 所述码字到层的第一映射包 含至少一个码字与至少一个传输层的第一映射,所述传输层为所述基站与所述 用户设备之间的传输层;
所述发送单元还用于向所述用户设备发送第二参考信号集;
所述发送单元还用于基于码字到层的第二映射向所述用户设备发送的数 据,以便于所述用户设备基于所述第二参考信号集和所述码字到层的第二映射 接收所述基站发送的所述数据, 其中, 所述码字到层的第一映射中至少一个码 字映射的层数比所述码字到层的第二映射中码字映射的层数要少,所述码字到 层的第一映射包含至少一个码字与至少一个所述传输层的第二映射。
14、 如权利要求 13所述的基站, 其特征在于, 所述码字到层的第一映射 包括如下至少一项:
三个码字与三个层的映射, 其中, 一个码字只允许映射到一个层; 以及 四个码字与四个层的映射, 其中, 一个码字只允许映射到一个层。
15、 如权利要求 14所述的基站, 其特征在于, 所述码字到层的第一映射 至少包括如下映射:
Figure imgf000043_0001
其中, N 表示层数, NcW表示码字数, X (Q)«、 χ(1)ω、 χ(2)«、 χ(3)ω分别为各层 上传输的符号, d(°)(i)d(1)(i)d( (i)d( (i)分别为各码字包含的符号,
M b、 M b、 M^b、 Ms(y 分别为各层传输的符号数。
16、 如权利要求 13-15中任一项所述的基站, 其特征在于, 所述基站还包 括:
配置单元,用于通过信令给所述用户设备配置所述码字到层的第一映射或 者所述码字到层的第二映射。
17、 一种用户设备, 其特征在于, 包括: 接收器、 处理器和发射器, 其中: 所述接收器, 用于接收基站发送的第一参考信号集;
所述处理器,用于基于所述第一参考信号集和码字到层的第一映射得到包 括秩指示 RI和信道质量指示 CQI的信道状态信息 CSI, 其中, 所述码字到层 的第一映射包含至少一个码字与至少一个传输层的第一映射,所述传输层为所 述基站与所述用户设备之间的传输层;
所述发射器, 用于向所述基站发送所述 CSI;
所述接收器还用于接收基站发送的第二参考信号集;
所述接收器还用于基于所述第二参考信号集和码字到层的第二映射接收 基站发送的数据,其中, 所述码字到层的第一映射中至少一个码字映射的层数 比所述码字到层的第二映射中码字映射的层数要少, 其中, 所述码字到层的第 一映射包含至少一个码字与至少一个所述传输层的第二映射。
18、 如权利要求 17所述的用户设备, 其特征在于, 所述码字到层的第一 映射包括如下至少一项:
三个码字与三个层的映射, 其中, 一个码字只允许映射到一个层; 以及 四个码字与四个层的映射, 其中, 一个码字只允许映射到一个层。
19、 如权利要求 18所述的用户设备, 其特征在于, 所述码字到层的第一 映射至少包括如下映射:
层数 码字数 码字到层的映射
N layer N丄、 CW ί = 0,1,-,Μ^ -1 x<0)(i) = d<0)(i)
M layer = M (0) = M <1) = M (2)
3 3 x(')(i) = d(')(i) lvlsymb lvlsymb lvlsymb lvlsymb
X(2)(i) = d(2)(i) x(0>(i) = d(0>(i)
x(1>(i) = d(1>(i)
4 4 M,1 slayabr =M,1 smb =M,1 s(1) b =M,1 s(2)b =M,1 s(3)b
x(2'(i) = d(2'(i)
x(3'(i) = d(3'(i) 其中, N 表示层数, 表示码字数, 《、 χ(1) ω χ(2) « χ(3) ω分别为各层 上传输的符号, d(°)(i)d(1)(i)d( (i)d( (i)分别为各码字包含的符号, Λ(1)
Msymb Msymb Msymb Μ 分别为各层传输的符号数。
20、 如权利要求 17-19中任一项所述的用户设备, 其特征在于, 所述码字 到层的第一映射或者所述码字到层的第二映射由所述基站通过信令配置的。
21、 一种基站, 其特征在于, 包括: 发射器和接收器, 其中:
所述发射器, 用于向用户设备发送第一参考信号集;
所述接收器, 用于接收所述用户设备发送的包括秩指示 RI和信道质量指 示 CQI的信道状态信息 CSI,其中,所述 CSI是所述用户设备基于所述第一参 考信号集和码字到层的第一映射得到的, 其中, 所述码字到层的第一映射包含 至少 个码字与至少一个传输层的第一映射,所述传输层为所述基站与所述用 户设备之间的传输层;
所述发射器还用于向所述用户设备发送第二参考信号集;
所述发射器还用于基于码字到层的第二映射向所述用户设备发送的数据, 并向所述用户设备发送所述数据,以便于所述用户设备基于所述第二参考信号 集和所述码字到层的第二映射接收所述基站发送的所述数据, 其中, 所述码字 到层的第一映射中至少一个码字映射的层数比所述码字到层的第二映射中码 字映射的层数要少,所述码字到层的第一映射包含至少 个码字与至少一个所 述传输层的第二映射。
22、 如权利要求 21所述的基站, 其特征在于, 所述码字到层的第一映射 包括如下至少一项:
三个码字与三个层的映射, 其中, 一个码字只允许映射到一个层; 以及 四个码字与四个层的映射, 其中, 一个码字只允许映射到一个层。
23、 如权利要求 22所述的基站, 其特征在于, 所述码字到层的第一映射 至少包括如下映射:
Figure imgf000046_0001
其中, N 表示层数, NcW表示码字数, X (Q)«、 χ(1)ω、 χ(2)«、 χ(3)ω分别为各层 上传输的符号, d(°)(i)d(1)(i)d( (i)d( (i)分别为各码字包含的符号,
M b、 M b、 Ms( 、 Ms(y 分别为各层传输的符号数。
24、 如权利要求 21-23中任一项所述的方法, 其特征在于, 所述发射器还 用于通过信令给所述用户设备配置所述码字到层的第一映射或者所述码字到 层的第二映射。
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