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 PDFInfo
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- 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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0044—Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0417—Feedback systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0452—Multi-user MIMO systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
- H04B7/0473—Selection 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal 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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Priority Applications (7)
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| ES14897351T ES2761289T3 (es) | 2014-07-11 | 2014-07-11 | Método de transmisión de datos, equipo de usuario, y estación base |
| CN201910203384.XA CN109951217B (zh) | 2014-07-11 | 2014-07-11 | 一种数据传输方法、用户设备和基站 |
| KR1020177003524A KR20170028983A (ko) | 2014-07-11 | 2014-07-11 | 데이터 전송 방법, 사용자 장비, 및 기지국 |
| PCT/CN2014/082010 WO2016004614A1 (zh) | 2014-07-11 | 2014-07-11 | 一种数据传输方法、用户设备和基站 |
| CN201480036839.9A CN105453693B (zh) | 2014-07-11 | 2014-07-11 | 一种数据传输方法、用户设备和基站 |
| EP14897351.4A EP3160210B1 (en) | 2014-07-11 | 2014-07-11 | Data transmission method, user equipment and base station |
| US15/403,272 US10432371B2 (en) | 2014-07-11 | 2017-01-11 | Data transmission method, user equipment, and base station |
Applications Claiming Priority (1)
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| PCT/CN2014/082010 WO2016004614A1 (zh) | 2014-07-11 | 2014-07-11 | 一种数据传输方法、用户设备和基站 |
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| US15/403,272 Continuation US10432371B2 (en) | 2014-07-11 | 2017-01-11 | Data transmission method, user equipment, and base station |
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| US (1) | US10432371B2 (zh) |
| EP (1) | EP3160210B1 (zh) |
| KR (1) | KR20170028983A (zh) |
| CN (2) | CN109951217B (zh) |
| ES (1) | ES2761289T3 (zh) |
| WO (1) | WO2016004614A1 (zh) |
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| CN109792653A (zh) * | 2016-09-30 | 2019-05-21 | 瑞典爱立信有限公司 | 用于参考信号传输和测量的方法和设备 |
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| US10498513B2 (en) * | 2015-12-31 | 2019-12-03 | Idac Holdings, Inc. | Methods for dynamic management of reference signals |
| WO2017194019A1 (zh) * | 2016-05-13 | 2017-11-16 | 中兴通讯股份有限公司 | 信令传输方法装置及系统 |
| CN108631847B (zh) | 2017-03-24 | 2021-06-01 | 华为技术有限公司 | 传输信道状态信息的方法、终端设备和网络设备 |
| KR102206068B1 (ko) * | 2017-03-24 | 2021-01-21 | 삼성전자주식회사 | 무선 통신 시스템에서 상향링크 전송을 위한 장치 및 방법 |
| JP6977031B2 (ja) | 2017-03-25 | 2021-12-08 | エルジー エレクトロニクス インコーポレイティドLg Electronics Inc. | 無線通信システムにおける位相雑音除去のためのptrs受信方法及びその装置 |
| CN115865152B (zh) * | 2017-05-11 | 2024-12-24 | 中兴通讯股份有限公司 | 码本配置方法、装置、通信设备及介质 |
| US10396871B2 (en) | 2017-06-15 | 2019-08-27 | At&T Intellectual Property I, L.P. | Layer mapping subset restriction for 5G wireless communication systems |
| WO2019025319A1 (en) * | 2017-07-31 | 2019-02-07 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | DATA TRANSMISSION BY SEVERAL USERS ON SHARED RESOURCES BASED ON STRUCTURED OVERLAY CODING |
| CN110831130B (zh) * | 2018-08-10 | 2021-10-22 | 华为技术有限公司 | 数据传输方法及装置 |
| EP3864913A4 (en) * | 2018-10-11 | 2022-06-08 | Lenovo (Beijing) Limited | METHOD AND APPARATUS FOR CODEBOOK BASED MULTIDISK AND/OR MULTICARRIER PSA TRANSMISSIONS |
| CN113412594B (zh) * | 2019-02-14 | 2024-10-15 | 瑞典爱立信有限公司 | 多层传输技术 |
| CN111030738A (zh) * | 2019-12-28 | 2020-04-17 | 惠州Tcl移动通信有限公司 | 一种mimo天线的优化方法及移动终端 |
| US12538315B2 (en) * | 2021-08-27 | 2026-01-27 | Qualcomm Incorporated | Multiple TB configuration in multi-PDSCH grant |
| WO2023081107A1 (en) * | 2021-11-03 | 2023-05-11 | Intel Corporation | Enhanced uplink transmission using multiple codewords |
| CN114422007B (zh) * | 2022-03-24 | 2022-07-01 | 新华三技术有限公司 | 一种上行数据调制方法及装置 |
| CN114745079B (zh) * | 2022-06-13 | 2022-08-30 | 深圳金信诺高新技术股份有限公司 | 一种自适应调制编码方法、接入网设备及存储介质 |
| CN120034221A (zh) * | 2023-11-23 | 2025-05-23 | 华为技术有限公司 | 一种通信方法及相关设备 |
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2014
- 2014-07-11 CN CN201910203384.XA patent/CN109951217B/zh active Active
- 2014-07-11 CN CN201480036839.9A patent/CN105453693B/zh active Active
- 2014-07-11 WO PCT/CN2014/082010 patent/WO2016004614A1/zh not_active Ceased
- 2014-07-11 EP EP14897351.4A patent/EP3160210B1/en active Active
- 2014-07-11 KR KR1020177003524A patent/KR20170028983A/ko not_active Ceased
- 2014-07-11 ES ES14897351T patent/ES2761289T3/es active Active
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2017
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| CN109792653A (zh) * | 2016-09-30 | 2019-05-21 | 瑞典爱立信有限公司 | 用于参考信号传输和测量的方法和设备 |
| CN109792653B (zh) * | 2016-09-30 | 2021-07-13 | 瑞典爱立信有限公司 | 用于参考信号传输和测量的方法、装置及介质 |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2761289T3 (es) | 2020-05-19 |
| KR20170028983A (ko) | 2017-03-14 |
| EP3160210B1 (en) | 2019-10-09 |
| CN109951217A (zh) | 2019-06-28 |
| CN109951217B (zh) | 2022-05-31 |
| CN105453693B (zh) | 2019-03-26 |
| CN105453693A (zh) | 2016-03-30 |
| US10432371B2 (en) | 2019-10-01 |
| EP3160210A4 (en) | 2017-07-19 |
| EP3160210A1 (en) | 2017-04-26 |
| US20170126376A1 (en) | 2017-05-04 |
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