WO2016106721A1 - 一种csi-rs传输方法、网络设备及用户设备 - Google Patents
一种csi-rs传输方法、网络设备及用户设备 Download PDFInfo
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- WO2016106721A1 WO2016106721A1 PCT/CN2014/095991 CN2014095991W WO2016106721A1 WO 2016106721 A1 WO2016106721 A1 WO 2016106721A1 CN 2014095991 W CN2014095991 W CN 2014095991W WO 2016106721 A1 WO2016106721 A1 WO 2016106721A1
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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
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
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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
- H04B7/0413—MIMO systems
- H04B7/0417—Feedback systems
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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
- H04B7/0634—Antenna weights or vector/matrix coefficients
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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
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
Definitions
- the present invention relates to the field of communications technologies, and in particular, to a CSI-RS transmission method, a network device, and a user equipment.
- Massive MIMO Massive Multiple-Input Multiple-Output
- 5G Fifth Generation Mobile Communication Technology
- the base station when transmitting a CSI-RS (Channel State Indication Reference Signal), the base station generally performs corresponding coverage enhancement by increasing the transmit power of the transmitting end.
- CSI-RS Channel State Indication Reference Signal
- the CSI-RS is an omnidirectional transmission, there may be many user equipments in the transmission direction, resulting in a larger portion of the transmission power being absorbed by the surrounding environment, and the utilization of the transmission power is lower, resulting in waste of power.
- the embodiments of the present invention provide a CSI-RS transmission method, a network device, and a user equipment, which are used to solve the technical problem that power waste is serious when transmitting a CSI-RS.
- a first aspect of the present invention provides a CSI-RS transmission method, including:
- the network device acquires a first precoding matrix
- the network device pre-codes the CSI-RS according to the first pre-coding matrix
- the network device sends the pre-coded CSI-RS to the user equipment.
- the acquiring, by the network device, the first precoding matrix includes:
- the network device selects, as the first precoding matrix, a precoding matrix corresponding to the determined number of ports from the first precoding matrix codebook.
- the network device selects, from the first precoding matrix codebook, a preamble corresponding to the number of the ports.
- the method further includes:
- the network device selects a precoding matrix from the M CSI feedback precoding matrix codebooks, and the first precoding matrix codebook is formed by the selected precoding matrix, where the first precoding matrix codebook includes A precoding matrix of at least two ports, M being a positive integer.
- the network device selects a precoding matrix from the M CSI feedback precoding matrix codebooks,
- the precoding matrix constitutes the first precoding matrix codebook, including:
- the network device selects, from the i-th CSI feedback precoding matrix codebook, a precoding matrix whose number of layers is equal to the determined number of ports, where i is a positive integer, and 1 ⁇ i ⁇ M;
- the network device adds the selected precoding matrix to the first precoding matrix codebook.
- the method further includes:
- the network device reacquires the first precoding matrix; otherwise, the user equipment continues according to the The first precoding matrix precodes the CSI-RS, and sends the precoded CSI-RS to the user equipment.
- the receiving, by the network device, the feedback message of the user equipment for the first precoding matrix includes: The network device receives the feedback message of the user equipment for the first precoding matrix through a PUCCH, an EPUCCH, or a PUSCH.
- the feedback message indicates that the PMI corresponding to the first precoding matrix is an available PMI of the CSI-RS, the feedback message includes the PMI or is used to confirm that the PMI is the CSI-RS. Confirmation information of available PMI;
- the feedback message indicates that the PMI corresponding to the first precoding matrix is not the available PMI of the CSI-RS
- the feedback message includes indication information for re-acquiring the first precoding matrix or used for confirming the location.
- the PMI is not the confirmation information of the available PMI of the CSI-RS.
- the network device sends the pre-coded CSI-RS to the user equipment, including:
- the network device sends the pre-coded CSI-RS to the user equipment by using a PDCCH or an EPDCCH.
- a second aspect of the present invention provides a CSI-RS transmission method, including:
- the pre-coded channel state indication reference signal CSI-RS sent by the network device, where the pre-coded CSI-RS is used by the network device to pre-process the CSI-RS according to the acquired first precoding matrix Coded.
- the method further includes:
- the user equipment sends a feedback message to the network device for the first precoding matrix.
- the method further includes:
- the user equipment compares the parameters of the pre-coded CSI-RS with a preset parameter threshold, and generates a feedback message for the first pre-coding matrix according to the comparison result.
- the user equipment compares the parameter of the pre-coded CSI-RS with a preset parameter threshold Generating a feedback message for the first precoding matrix according to the comparison result, including:
- the user equipment compares the parameter of the pre-coded CSI-RS with a preset parameter threshold, and if the relationship between the pre-coded CSI-RS parameter and the preset parameter threshold satisfies a preset And determining, by the comparison, that the precoding matrix corresponding to the first precoding matrix indicates that the PMI is an available PMI of the CSI-RS, and generating feedback for the first precoding matrix according to the comparison result. Message; or
- the user equipment compares the parameter of the pre-coded CSI-RS with a preset parameter threshold, if the relationship between the pre-coded CSI-RS parameter and the preset parameter threshold does not satisfy the Determining a predetermined condition, determining that the PMI corresponding to the first precoding matrix is not an available PMI of the CSI-RS, and generating a feedback message for the first precoding matrix according to the comparison result .
- the feedback message indicates that the PMI corresponding to the first precoding matrix is an available PMI of the CSI-RS, the feedback message includes the PMI or is used to confirm that the PMI is the CSI-RS. Confirmation information of available PMI;
- the feedback message indicates that the PMI corresponding to the first precoding matrix is not the available PMI of the CSI-RS
- the feedback message includes reselection indication information for obtaining the first precoding matrix or for confirming The PMI is not confirmation information of the available PMI of the CSI-RS.
- a third aspect of the present invention provides a network device, including:
- An obtaining module configured to acquire a first precoding matrix
- a precoding module configured to precode the channel state indication reference signal CSI-RS according to the first precoding matrix
- a sending module configured to send the pre-coded CSI-RS to the user equipment.
- the acquiring module is specifically configured to:
- a precoding matrix corresponding to the determined number of ports is selected from the first precoding matrix codebook as the first precoding matrix.
- the acquiring module is further configured to: select, in the code from the first precoding matrix, the port Before the precoding matrix corresponding to the number is used as the first precoding matrix, selecting a precoding matrix from the M CSI feedback precoding matrix codebooks, and forming the first precoding matrix codebook by using the selected precoding matrix,
- the first precoding matrix codebook includes a precoding matrix corresponding to at least two ports, and M is a positive integer.
- the acquiring module is further configured to:
- the selected precoding matrix is added to the first precoding matrix codebook.
- the network The device further includes: a receiving module, configured to: receive a feedback message of the user equipment for the first precoding matrix;
- the acquiring module re-acquires the first precoding matrix
- the precoding module continues to precode the CSI-RS according to the first precoding matrix.
- the sending module sends the pre-coded CSI-RS to the user equipment.
- the receiving module is specifically configured to: receive, by using a PUCCH, an EPUCCH, or a PUSCH, the user equipment, The feedback message of the first precoding matrix.
- the sending module is specifically configured to: send, by using a PDCCH or an EPDCCH, the pre-coded CSI-RS to the User equipment.
- a fourth aspect of the present invention provides a user equipment, including:
- a receiving module configured to receive a pre-coded CSI-RS sent by the network device, where the pre-coded CSI-RS is used by the network device to pre-code the CSI-RS according to the obtained first precoding matrix.
- the user equipment further includes: a sending module, configured to: send, to the network device, a feedback message for the first precoding matrix.
- the user equipment further includes: a comparing module, configured to: use the pre-coded CSI-RS The parameter is compared with a preset parameter threshold, and a feedback message for the first precoding matrix is generated according to the comparison result.
- the comparing module is specifically configured to:
- the comparison result is that the PMI corresponding to the first precoding matrix is an available PMI of the CSI-RS, and generates a feedback message for the first precoding matrix according to the comparison result;
- a fifth aspect of the present invention provides a network device including a memory, a processor, and a transmitter connected to a same bus;
- the memory is configured to store an instruction
- the processor is configured to execute the instruction, obtain a first precoding matrix, and precode the CSI-RS according to the first precoding matrix;
- the transmitter is configured to send the pre-coded CSI-RS to the user equipment.
- the processor is specifically configured to:
- a precoding matrix corresponding to the determined number of ports is selected from the first precoding matrix codebook as the first precoding matrix.
- the processor is further configured to: execute the instruction in the code from the first precoding matrix Before selecting a precoding matrix corresponding to the number of ports as the first precoding matrix, selecting a precoding matrix from the M CSI feedback precoding matrix codebooks, and configuring the first precoding by the selected precoding matrix a matrix codebook, the first precoding matrix codebook includes a precoding matrix corresponding to at least two ports, and M is a positive integer.
- the processor is further configured to:
- the selected precoding matrix is added to the first precoding matrix codebook.
- the network The device also includes a receiver coupled to the bus;
- the receiver is configured to: receive a feedback message of the user equipment for the first precoding matrix
- the processor is further configured to: if the feedback message indicates a PMI corresponding to the first precoding matrix Retrieving the first precoding matrix instead of the available PMI of the CSI-RS; otherwise continuing to precode the CSI-RS according to the first precoding matrix and using the transmitter to The precoded CSI-RS is sent to the user equipment.
- the receiver is specifically configured to: receive, by using a PUCCH, an EPUCCH, or a PUSCH, the user equipment, The feedback message of the first precoding matrix.
- the transmitter is specifically configured to send the pre-coded CSI-RS to the user equipment by using a PDCCH or an EPDCCH.
- a sixth aspect of the invention provides a user equipment comprising a receiver connected to a bus;
- the receiver is configured to: receive a pre-coded CSI-RS sent by the network device, where the pre-coded CSI-RS pre-codes the CSI-RS according to the acquired first pre-coding matrix by the network device owned.
- the user equipment further includes: a transmitter connected to the bus, configured to: send, to the network device, the first precoding Matrix feedback message.
- the user equipment further includes a memory and a processor connected to the bus;
- the memory is configured to store an instruction
- the processor is configured to execute the instruction, compare the parameter of the pre-coded CSI-RS with a preset parameter threshold, and generate a feedback message for the first pre-coding matrix according to the comparison result.
- the processor is specifically configured to:
- Executing the instruction comparing the parameter of the pre-coded CSI-RS with a preset parameter threshold, if the relationship between the pre-coded CSI-RS parameter and the preset parameter threshold is not satisfied Determining, by the preset condition, that the PMI corresponding to the first precoding matrix is not an available PMI of the CSI-RS, and generating feedback for the first precoding matrix according to the comparison result. Message.
- the CSI-RS when the network device is to transmit the CSI-RS to the user equipment, the CSI-RS is first pre-coded according to the obtained precoding matrix, which is equivalent to performing beaming on the CSI-RS. Forming, and transmitting the pre-coded CSI-RS to the user equipment, so that after receiving the pre-coded CSI-RS, the user equipment may set the parameters of the pre-coded CSI-RS Comparing with the preset parameter threshold, for example, if the relationship between the parameter of the pre-coded CSI-RS and the preset parameter threshold satisfies a preset condition, the user equipment determines that the received signal has a larger power.
- the power consumption is small, which is equivalent to the fact that after the beamforming of the CSI-RS, the transmission direction of the pre-coded CSI-RS is substantially aligned with the user equipment, so the user equipment receives If the power of the precoded CSI-RS is large, the user equipment determines that the CSI-RS may be precoded with the precoding matrix, and if the precoded CSI-RS The relationship between the parameter and the preset parameter threshold does not satisfy the The preset condition is that the user equipment determines that the received signal has a small power and a large power waste, which is equivalent to the transmit direction of the pre-coded CSI-RS after beamforming the CSI-RS.
- the user equipment determines that the CSI-RS may be continued without using the precoding matrix.
- the network device re-determines the precoding mode of the CSI-RS, for example, reselecting the precoding matrix to precode the CSI-RS, and then transmitting the re-coded CSI-RS. Judge the user equipment Break, and so on, until the appropriate precoding matrix is selected for the user equipment.
- a method of beamforming at the transmitting end is adopted to improve the utilization of the transmitting power. Due to the beamforming, the effective coverage of the CSI-RS can be greatly improved, that is, the CSI-RS is transmitted to each user equipment as much as possible, thereby improving the data throughput and performance of the entire system, and transmitting data for the control layer plane and the data plane. Performance improvements play a key role.
- FIG. 1 is a main flowchart of a method for transmitting a CSI-RS on a network device side according to an embodiment of the present invention
- FIG. 2 is a main structural block diagram of a network device according to an embodiment of the present invention.
- FIG. 3 is a structural block diagram of a network device further including a receiving module according to an embodiment of the present invention
- FIG. 4 is a schematic diagram of main structures of a network device according to an embodiment of the present invention.
- FIG. 5 is a schematic structural diagram of a network device further including a receiver according to an embodiment of the present disclosure
- FIG. 6 is a schematic diagram of a main structure of a user equipment according to an embodiment of the present invention.
- FIG. 7 is a schematic structural diagram of a user device further including a memory, a processor, and a transmitter according to an embodiment of the present invention.
- An embodiment of the present invention provides a CSI-RS transmission method, where the method includes: a network device acquiring a first precoding matrix; the network device precoding a CSI-RS according to the first precoding matrix; the network The device sends the pre-coded CSI-RS to the user equipment.
- the CSI-RS when the network device is to transmit the CSI-RS to the user equipment, the CSI-RS is first pre-coded according to the obtained precoding matrix, which is equivalent to performing beaming on the CSI-RS. Forming, and transmitting the pre-coded CSI-RS to the user equipment, so that after receiving the pre-coded CSI-RS, the user equipment may set the parameters of the pre-coded CSI-RS Comparing with the preset parameter threshold, for example, if the relationship between the parameter of the pre-coded CSI-RS and the preset parameter threshold satisfies a preset condition, the user equipment determines that the received signal has a larger power.
- the power waste is small, which is equivalent to, after beamforming the CSI-RS, the pre- The transmitting direction of the encoded CSI-RS is substantially aligned with the user equipment. Therefore, if the power of the pre-coded CSI-RS received by the user equipment is large, the user equipment determines that the user equipment may use the The precoding matrix continues to precode the CSI-RS, and if the relationship between the pre-coded CSI-RS parameter and the preset parameter threshold does not satisfy the preset condition, the user equipment determines The power of the received signal is small, and the power is wasted.
- the beam direction of the CSI-RS is not aligned with the user equipment after the beamforming of the CSI-RS.
- the power of the pre-coded CSI-RS received by the user equipment is small, and the user equipment determines that the CSI-RS may be pre-coded without using the pre-coding matrix, then the network device
- the CSI-RS precoding mode is re-determined. For example, the CSI-RS is pre-coded by reselecting the precoding matrix, and then the re-coded CSI-RS is sent to the user equipment for judgment. Until you choose to fit the user device Until the pre-coding matrix.
- a method of beamforming at the transmitting end is adopted to improve the utilization of the transmitting power. Due to the beamforming, the effective coverage of the CSI-RS can be greatly improved, that is, the CSI-RS is transmitted to each user equipment as much as possible, thereby improving the data throughput and performance of the entire system, and transmitting data for the control layer plane and the data plane. Performance improvements play a key role.
- the techniques described herein can be used in a variety of communication systems, such as current 2G (second generation mobile communication technology), 3G (third generation mobile communication technology) communication systems, and next generation communication systems, such as the Global System for Global System (Global System for Mobile Communications) Mobile communications, GSM), Code Division Multiple Access (CDMA) system, Time Division Multiple Access (TDMA) system, Wideband Code Division Multiple Access Wireless (WCDMA), frequency Divisional Multiple Addressing (Frequency Division Multiple Addressing, FDMA) system, Orthogonal Frequency-Division Multiple Access (OFDMA) system, single carrier FDMA (SC-FDMA) system, General Packet Radio Service (GPRS) system, Long Term Evolution (Long) Term Evolution, LTE) systems, and other such communication systems.
- GSM Global System for Global System
- CDMA Code Division Multiple Access
- TDMA Time Division Multiple Access
- WCDMA Wideband Code Division Multiple Access Wireless
- OFDMA frequency Divisional Multiple Addressing
- OFDMA Orthogonal Frequency-Division Multiple Access
- the wireless terminal may be a device that provides voice and/or data connectivity to the user, a handheld device with wireless connectivity, or a wireless modem. Other processing equipment.
- the wireless terminal can communicate with one or more core networks via a radio access network (eg, RAN (Radio Access Network)), which can be a mobile terminal, such as a mobile phone (or "cellular" phone) and has a mobile
- RAN Radio Access Network
- the computer of the terminal for example, can be a portable, pocket, handheld, computer built-in or in-vehicle mobile device that exchanges language and/or data with the wireless access network.
- a wireless terminal may also be called a system, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, an access point, or an access point.
- Remote Terminal Access Terminal, User Terminal, User Agent, User Device, or User Equipment.
- a network device such as a base station (e.g., an access point), may specifically refer to a device in an access network that communicates with a wireless terminal over one or more sectors over an air interface.
- the base station can be used to convert the received air frame to the IP packet as a router between the wireless terminal and the rest of the access network, wherein the remainder of the access network can include an Internet Protocol (IP) network.
- IP Internet Protocol
- the base station can also coordinate attribute management of the air interface.
- 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 LTE.
- the evolved base station NodeB or eNB or e-NodeB, evolutional Node B
- NodeB evolutional Node B
- system and “network” are used interchangeably herein.
- the term “and/or” in this context is merely an association describing the associated object, indicating that there may be three relationships, for example, A and / or B, which may indicate that A exists separately, and both A and B exist, respectively. B these three situations.
- the character "/" in this article unless otherwise specified, generally indicates that the contextual object is an "or" relationship.
- an embodiment of the present invention provides a CSI-RS transmission method, where the method can be applied to a network device.
- the main flow of the method is described below.
- Step 101 The network device acquires a first precoding matrix.
- the network device When the network device is to send the CSI-RS to the user equipment, the network device first obtains a precoding matrix to precode the CSI-RS according to the precoding matrix, which is used in the embodiment of the present invention.
- the coding matrix is referred to as the first precoding matrix.
- the acquiring, by the network device, the first precoding matrix includes:
- the network device selects, as the first precoding matrix, a precoding matrix corresponding to the determined number of ports from the first precoding matrix codebook.
- the network device may correspond to multiple user devices, and the number of ports used by the network device to send CSI-RS to different user devices may be different. For example, for user device 1, the network device may use two ports. Sending, for user equipment 2, the network device may be sent with 4 ports, and so on.
- the port here refers to a logical port, for example, one port can correspond to 5 physical antennas.
- the actual setting is not limited in the present invention, and the numerical values herein are for the sake of example only.
- the first precoding matrix codebook is a codebook formed by a precoding matrix pre-coded specifically for a CSI-RS, and the first precoding matrix codebook may include at least one And a precoding matrix, wherein the precoding matrix included in the first precoding matrix codebook corresponds to at least two ports. That is to say, for example, the network device determines that the user equipment 1 is to be sent by using two ports, then the precoding matrix corresponding to the port 2 can be selected from the first precoding matrix codebook as the user equipment 1 Precoding matrix.
- the precoding is generated before the network device selects a precoding matrix corresponding to the number of ports from the first precoding matrix codebook as the first precoding matrix.
- Matrix codebook including:
- the network device selects a precoding matrix from the M CSI feedback precoding matrix codebooks, and the first precoding matrix codebook is formed by the selected precoding matrix, where the first precoding matrix codebook includes A precoding matrix of at least two ports, M being a positive integer.
- the CSI feedback precoding matrix codebook that is, the CSI feedback (feedback) codebook, is a precoding matrix codebook existing in the prior art, where each CSI feedback precoding matrix codebook corresponds to a port number, and each CSI
- the feedback precoding matrix codebook includes multiple precoding matrices, and the number of layers corresponding to the precoding matrices may be different.
- one CSI feedback precoding matrix may also have different precoding matrices corresponding to the same layer number.
- the network device may separately select a precoding matrix from the M CSI feedback precoding matrix codebooks, where the precoding matrix selected from a CSI precoding matrix codebook is a layer number and the CSI pre A precoding matrix in which the number of ports corresponding to the code matrix codebook is equal.
- the network device selects a precoding matrix from the M CSI feedback precoding matrix codebooks, and the first precoding matrix codebook is formed by the selected precoding matrix, including:
- the network device selects, from the i-th CSI feedback precoding matrix codebook, a precoding matrix whose number of layers is equal to the determined number of ports, where i is a positive integer, and 1 ⁇ i ⁇ M;
- the network device adds the selected precoding matrix to the first precoding matrix codebook in.
- the precoding matrix with the layer number 2 is selected, and the selected precoding matrix is added to The first precoding matrix codebook described in the embodiment of the present invention.
- the number of ports corresponding to the CSI feedback precoding matrix codebook 2 is 4, when the network device selects a precoding matrix, the precoding matrix with a layer number of 4 is selected, and the selected precoding matrix is added. To the first precoding matrix codebook described in the embodiment of the present invention, and so on.
- the network device may process multiple CSI feedback precoding matrix codebooks at the same time, or may process each CSI feedback precoding matrix one by one, that is, it may be processed in parallel to improve processing efficiency or serial processing. , to reduce errors that may occur during processing.
- the network device may perform processing, and the precoding matrix is selected to form the first precoding matrix codebook in the embodiment of the present invention, so that the obtained result is comprehensive. It is better to process CSI-RS for different user equipments.
- the network device may also select some CSI feedback precoding matrix for processing, and select the precoding matrix from the CSI feedback precoding matrix codebook to form the first precoding matrix codebook in the embodiment of the present invention. In this way, the network device requires less processing, reduces the burden on the network device, and reduces processing time.
- the first precoding matrix codebook in the embodiment of the present invention is generated, and the first precoding matrix codebook includes a precoding matrix corresponding to at least two ports.
- the network device sends a CSI-RS to a user equipment
- the first precoding matrix pair is selected from the first precoding matrix codebook according to the number of ports corresponding to the user equipment. -RS for precoding.
- Table 1 is a CSI feedback precoding matrix codebook.
- the number of ports corresponding to the CSI feedback precoding matrix codebook is 4.
- the CodeBook Index in Table 1 is a codebook index, number of layers, indicating the number of layers (or may also be called a stream number), and one layer represents a data stream, that is, different layers represent different data streams.
- W represents a specific matrix
- u n is a variable in W.
- W 1 means that u n in the W is u 1 .
- the superscript of W indicates which columns are taken out from the matrix of W to form a new matrix, W as a matrix, which includes a plurality of columns, for example, W ⁇ 1 ⁇ means that the first column is taken out from the matrix of W to form a new one.
- the matrix, W ⁇ 1234 ⁇ indicates that the first column, the second column, the third column, and the fourth column are taken out from the matrix of W to form a new matrix, and so on.
- W 1 ⁇ 1234 ⁇ means that the first column, the second column, the third column, and the fourth column are taken out from the matrix of W to form a new matrix, where u n in the matrix of W is u 1 .
- the number of ports corresponding to the CSI feedback precoding matrix codebook shown in Table 1 is 4, when selecting a precoding matrix to be added to the first precoding matrix codebook, it can be selected from Table 1.
- the column precoding matrix having a layer number of 4, that is, the rightmost column of the precoding matrix in Table 1 can be added to the first precoding matrix codebook.
- the first precoding matrix codebook in the embodiment of the present invention is as shown in Table 2:
- the network device adds a column precoding matrix with a layer number of 4 in the CSI feedback precoding matrix codebook shown in Table 1 to the first precoding matrix codebook as A precoding matrix corresponding to the number of ports 4.
- the CSI feedback precoding matrix codebook corresponding to the number of other ports can also be processed in the same manner.
- the number of precoding matrices added to the first precoding matrix codebook may be the same or different for different port numbers.
- the first The number of ports corresponding to 15 precoding matrices in the precoding matrix codebook is 4, and for port number 2, the number of corresponding precoding matrices in the first precoding matrix codebook may also be 15 It may or may not be 15, which is the same for the number of other ports.
- the obtained first precoding matrix codebook is as shown in Table 3, for example:
- the network device selects a part of a column precoding matrix having a layer number of 4 in the CSI feedback precoding matrix codebook shown in Table 1 and adds the code to the first precoding matrix codebook. In the middle, it is a precoding matrix corresponding to the number of ports 4.
- the network device when the network device processes each CSI feedback precoding matrix codebook, the network device may perform processing in the same manner, that is, all precoding matrices from which a specific number of layers can be selected are added to the first a partial precoding matrix from which a specific number of layers can be selected in a precoding matrix is added to the first precoding matrix; or, processing may be performed in different manners, that is, partial CSI feedback is pre-processed therein An encoding matrix codebook, wherein all precoding matrices from which a specific number of layers can be selected are added to the first precoding matrix codebook, and for another partial CSI feedback precoding matrix codebook, a partial preamble of a specific number of layers can be selected therefrom An encoding matrix is added to the first precoding matrix.
- the specific processing manner is not limited in the embodiment of the present invention.
- Step 102 The network device pre-codes the CSI-RS according to the first pre-coding matrix.
- the network device After selecting the first precoding matrix, the network device encodes the CSI-RS according to the first precoding matrix to obtain a precoded CSI-RS.
- the pre-coded CSI-RS is substantially CSI-RS.
- Step 103 The network device sends the pre-coded CSI-RS to the user equipment.
- the network device may send the pre-coded CSI-RS to the user equipment.
- the PMI Precoding Matrix Indicator
- the matrix device is sent to the user equipment, or the network device may send the PMI corresponding to the first precoding matrix to the user equipment at other occasions, or the user equipment may also use other methods.
- the PMI corresponding to the first precoding matrix is obtained, which is not limited in the present invention.
- the method may further include:
- the network device reacquires the first precoding matrix; otherwise, the user equipment continues according to the The first precoding matrix precodes the CSI-RS, and sends the precoded CSI-RS to the user equipment.
- the user equipment after receiving the pre-coded CSI-RS, compares the pre-coded CSI-RS parameters with a preset parameter threshold to generate a comparison result, and Generating a feedback message for transmission to the network device based on the comparison.
- the network device may reacquire the first precoding matrix from the first precoding matrix codebook. And re-encoding the CSI-RS by using the re-acquired first pre-coding matrix, after which the network device sends the re-pre-coded CSI-RS to the user equipment. Similarly, the user equipment compares the re-precoded CSI-RS parameter with the preset parameter threshold to obtain a comparison result, and generates feedback for sending to the network device according to the comparison result.
- the message is that, after receiving the feedback message, the network device determines, according to the feedback message, whether the PMI corresponding to the reselected first precoding matrix is the available PMI of the CSI-RS, in the same manner as before. If the PMI corresponding to the reacquired first precoding matrix is an available PMI as the CSI-RS, the network device may continue to use the reacquired first precoding matrix pair to the CSI-RS. Performing precoding, and if the re-acquisition of the first pre- If the PMI corresponding to the coding matrix is still not the available PMI of the CSI-RS, the network device may re-select the first precoding matrix from the first precoding matrix codebook to precode the CSI-RS. This is cyclically executed until the end of the loop process is selected when one of its PMIs can be used as the first precoding matrix of the available PMI of the CSI-RS.
- step 103 may be a step of finally ending the loop, that is, before step 103, there may be at least one loop process of selecting an available PMI of the CSI-RS, but during these loops, each time None of the available PMIs to the CSI-RS are selected, and of course, any looping process may not be included before step 103, ie the network device selects the available PMI of the CSI-RS at a time.
- the available PMI means that the user equipment determines that the first precoding matrix corresponding to the PMI can be used as a precoding matrix for precoding the CSI-RS. That is, if the user equipment compares and determines that the relationship between the pre-coded CSI-RS parameter and the preset parameter threshold satisfies a preset condition, the user equipment may consider that the first pre-coding matrix corresponding to the received PMI may be As a precoding matrix for precoding the CSI-RS, such a PMI is referred to as an available PMI in the embodiment of the present invention, or may also be referred to as an alternate PMI.
- the preset parameter threshold is a preset power threshold
- the comparison result obtained by the user equipment is that the PMI corresponding to the first precoding matrix is an alternate PMI of the CSI-RS, that is, for the user equipment, by the first
- the received power of the precoded CSI-RS is large, and the CSI-RS may be precoded by using the first precoding matrix.
- the network device may continue to precode the CSI-RS by using the first precoding matrix, and may end the cyclic process of selecting the first precoding matrix for the user equipment.
- the preset parameter threshold is a preset power threshold
- the power of the pre-coded CSI-RS is less than the preset power Threshold
- the comparison result obtained by the user equipment is that the PMI corresponding to the first precoding matrix cannot be used as the candidate PMI of the CSI-RS, that is, for the user equipment, by using the first After precoding the CSI-RS by the precoding matrix, the received power of the precoded CSI-RS is small, and the precoding CSI-RS obtained after beamforming may be considered to be sent.
- the CSI-RS may not be pre-coded by using the first pre-coding matrix, and the CSI-RS may be pre-selected by using another first pre-coding matrix.
- the coding is performed in such a manner that the direction of transmission of the pre-coded CSI-RS is aligned with the direction in which the user equipment is located, the power of the received signal is increased, and the loss of power in the environment is reduced.
- the network device may determine that the CSI-RS is not pre-coded by using the first pre-coding matrix, but re-select another one from the first pre-coding matrix codebook. The first precoding matrix until the available PMI is selected for the CSI-RS.
- the network device sends the pre-coded CSI-RS to the user equipment, including:
- the network device sends the pre-coded CSI-RS to the user equipment by using a PDCCH (Physical Downlink Control Channel) or an Enhanced Physical Downlink Control Channel (EPDCCH).
- PDCCH Physical Downlink Control Channel
- EPDCCH Enhanced Physical Downlink Control Channel
- the network device receives the feedback message of the user equipment for the first pre-coded CSI-RS, including: the network device passes a PUCCH (Physical Uplink Control CHannel, physics) Receiving, by the user equipment, the first pre-coded, the uplink control channel, the EPUCCH (Enhanced Physical Uplink Control CHannel), or the PUSCH (Physical Uplink Shared Channel) Feedback message from CSI-RS.
- PUCCH Physical Uplink Control CHannel, physics
- the network device passes a PUCCH (Physical Uplink Control CHannel, physics) Receiving, by the user equipment, the first pre-coded, the uplink control channel, the EPUCCH (Enhanced Physical Uplink Control CHannel), or the PUSCH (Physical Uplink Shared Channel) Feedback message from CSI-RS.
- PUCCH Physical Uplink Control CHannel, physics
- the feedback message indicates that the PMI corresponding to the first precoding matrix is an available PMI of the CSI-RS, the feedback message includes the PMI or is used to confirm that the PMI is the CSI-RS. Confirmation information of available PMI;
- the feedback message indicates that the PMI corresponding to the first precoding matrix is not the available PMI of the CSI-RS
- the feedback message includes indication information for re-acquiring the first precoding matrix or used for confirming the location.
- the PMI is not the confirmation information of the available PMI of the CSI-RS.
- the user equipment sends the feedback message to the network device, and when the PMI corresponding to the first precoding matrix can be used as the available PMI of the user equipment, the PMI is directly added to the feedback message and sent to the network device. And adding the adjustment information of the PMI (for example, re-acquiring the indication information of the first precoding matrix) to the feedback message when the PMI corresponding to the first precoding matrix is not available as the available PMI of the user equipment. Sent to the network device. The adjustment information of the PMI or the PMI is directly sent to the network device, and the result can be presented to the network device more intuitively, thereby reducing the confirmation work required by the network device.
- the adjustment information of the PMI or the PMI is directly sent to the network device, and the result can be presented to the network device more intuitively, thereby reducing the confirmation work required by the network device.
- the user equipment may also add the corresponding confirmation information to the network device according to the judgment result of the user equipment, for example, if the user equipment determines one The PMI corresponding to the first precoding matrix can be used as the available PMI of the user equipment, and the confirmation information added by the user equipment to the feedback message indicates that the PMI can be used as the available PMI of the user equipment, if the user equipment determines The PMI corresponding to the first precoding matrix cannot be used as the available PMI of the user equipment, and the confirmation information added by the user equipment to the feedback message indicates that the PMI cannot be used as the available PMI of the user equipment.
- the acknowledgment information is sent to the network device, and the acknowledgment information generally has a small capacity.
- an acknowledgment message has only one bit (for example, when the acknowledgment message is "1", it indicates that a PMI can be used as the available PMI of the user equipment, and the acknowledgment information is " 0" indicates that a PMI cannot be used as the available PMI for the user equipment), reducing the amount of data that needs to be transmitted and increasing the transmission rate.
- the power of the CSI-RS received by each user equipment minimizes the transmission power consumed in the environment and improves the utilization of the transmission power.
- the same similar processing is performed for each user equipment, and each user equipment can be guaranteed to be as normal as possible. Receiving CSI-RS improves the coverage of CSI-RS.
- the embodiment of the present invention provides another CSI-RS transmission method, and the method may be applied to a user equipment.
- the user equipment in the embodiment of the present invention may be the same as the user equipment in FIG.
- the network device described in the embodiment of the present invention may be the same device as the network device described in FIG. 1 .
- the main process of the method is:
- the manner in which the network device obtains the pre-coded CSI-RS according to the obtained first pre-coding matrix and the CSI-RS is described in the flow of FIG. 1 , and details are not described herein.
- the network device may send the pre-coded CSI-RS to the user equipment by using a PDCCH or an EPDCCH.
- the method may further include:
- the user equipment sends a feedback message to the network device for the first precoding matrix.
- the method may further include:
- the user equipment compares the parameters of the pre-coded CSI-RS with a preset parameter threshold, and generates a feedback message for the pre-coded CSI-RS according to the comparison result.
- the user equipment compares the parameter of the pre-coded CSI-RS with a preset parameter threshold, and generates a feedback message for the first pre-coding matrix according to the comparison result.
- the user equipment compares the parameter of the pre-coded CSI-RS with a preset parameter threshold, and if the relationship between the pre-coded CSI-RS parameter and the preset parameter threshold satisfies a preset a condition, determining that the comparison result is that the PMI corresponding to the first precoding matrix is an available PMI of the CSI-RS, and generating a feedback message for the first precoding matrix according to the comparison result; or
- the user equipment compares the parameter of the pre-coded CSI-RS with a preset parameter threshold, if the relationship between the pre-coded CSI-RS parameter and the preset parameter threshold does not satisfy the Determining a predetermined condition, determining that the PMI corresponding to the first precoding matrix is not an available PMI of the CSI-RS, and generating a feedback message for the first precoding matrix according to the comparison result .
- the parameter may include one or more of a power parameter, a signal to noise ratio parameter, an interference signal power parameter, and any other possible parameters.
- the preset parameter threshold may be a preset power threshold
- the preset condition may be: the power of the pre-coded CSI-RS is greater than or equal to the Preset power threshold. That is, if the user equipment compares and determines that the power of the pre-coded CSI-RS is greater than or equal to the preset power threshold, determining that the power of the pre-coded CSI-RS meets the preset condition On the other hand, if the user equipment determines that the power of the pre-coded CSI-RS is less than the preset power threshold, it is determined that the power of the pre-coded CSI-RS does not satisfy the preset condition.
- the preset parameter threshold may specifically be a preset signal to noise ratio threshold.
- the preset condition may be: the precoded CSI-RS message.
- the noise ratio is greater than or equal to the preset signal to noise ratio threshold. That is, if the user equipment compares and determines that the signal to noise ratio of the precoded CSI-RS is greater than or equal to the preset signal to noise ratio threshold, determining a signal to noise ratio of the precoded CSI-RS.
- the predetermined condition is met. If the user equipment compares and determines that the signal to noise ratio of the precoded CSI-RS is less than the preset signal to noise ratio threshold, determining the precoded CSI-RS.
- the signal to noise ratio does not satisfy the preset condition.
- the preset parameter threshold may be a preset interference signal power threshold
- the preset condition may be: the pre-coded CSI-RS interference.
- the signal power is less than the preset interference signal power threshold. That is, if the user equipment compares and determines that the interference signal power of the precoded CSI-RS is less than the preset interference signal power threshold, determining that the interference signal power of the precoded CSI-RS is satisfied Said pre Setting the condition, if the user equipment compares and determines that the interference signal power of the precoded CSI-RS is greater than or equal to the preset interference signal power threshold, determining the interference signal of the precoded CSI-RS The power does not satisfy the preset condition.
- parameters may also include other parameters, and the preset conditions may also vary according to specific parameters.
- the preset parameter threshold is specifically the preset power threshold, and if the power of the pre-coded CSI-RS is greater than or equal to the preset power threshold, the user
- the comparison result obtained by the device is that the PMI corresponding to the first precoding matrix is an available PMI of the CSI-RS, that is, for the user equipment, the CSI is performed by the first precoding matrix.
- the received power of the precoded CSI-RS is relatively large, and the CSI-RS may be precoded by using the first precoding matrix, for the user equipment,
- the network device may continue to precode the CSI-RS by using the first precoding matrix.
- the preset parameter threshold is specifically the preset power threshold, and if the power of the pre-coded CSI-RS is less than the preset power threshold, the user equipment
- the result of the comparison is that the PMI corresponding to the first precoding matrix cannot be used as the available PMI of the CSI-RS, that is, for the user equipment, the CSI is performed by the first precoding matrix.
- the received power of the precoded CSI-RS is small, and the transmission direction of the precoded CSI-RS obtained after the beamforming is deviated from the location of the user equipment.
- the sending direction of the CSI-RS is aligned with the direction in which the user equipment is located, the power of the received signal is increased, and the loss of power in the environment is reduced.
- the method may further include:
- the feedback message indicates that the PMI corresponding to the first precoding matrix is an available PMI of the CSI-RS, the feedback message includes the PMI or is used to confirm that the PMI is the CSI-RS. Confirmation information of available PMI;
- the feedback message indicates that the precoding matrix corresponding to the first precoding matrix indicates that the PMI is not the available PMI of the CSI-RS
- the feedback message includes reselection indication information for acquiring the first precoding matrix. Or for confirming that the PMI is not the confirmation information of the available PMI of the CSI-RS.
- the network device reselects the first precoding matrix pair for the user.
- the CSI-RS of the device is pre-coded, and the re-coded CSI-RS is sent to the user equipment, and the loop is repeated until the feedback message sent by the user equipment indicates that the PMI corresponding to the first pre-coding matrix can be used as the user equipment.
- the loop ends.
- the network device may reselect the precoding matrix of the CSI-RS for the user equipment, until the available PMI that meets the preset condition is determined, The user equipment performs corresponding beamforming on the CSI-RS by using a precoding matrix corresponding to the PMI, so as to improve system performance.
- the embodiments of the present invention are directed to the disadvantage of CSI-RS omnidirectional transmission at high frequency, adopting a beamforming method at the transmitting end to improve the utilization of the transmission power, and the beamforming can greatly improve the CSI-RS.
- the coverage which improves the data throughput and performance of the entire system, can play a key role in improving the data transmission performance of the control plane and data plane.
- an embodiment of the present invention provides a network device, including an obtaining module 201, a precoding module 202, and a sending module 203.
- the obtaining module 201 is configured to acquire a first precoding matrix
- the precoding module 202 is configured to precode the CSI-RS according to the first precoding matrix
- the sending module 203 is configured to send the pre-coded CSI-RS to the user equipment.
- the obtaining module 201 is specifically configured to:
- a precoding matrix corresponding to the determined number of ports is selected from the first precoding matrix codebook as the first precoding matrix.
- the obtaining module 201 is further configured to: before selecting, from the first precoding matrix codebook, a precoding matrix corresponding to the number of ports as the first precoding matrix, from the M a precoding matrix is selected in the CSI feedback precoding matrix codebook, and the first precoding matrix codebook is formed by the selected precoding matrix, where the first precoding matrix codebook includes a preamble corresponding to at least two ports.
- the coding matrix, M is a positive integer.
- the acquiring module 201 is further configured to select a precoding matrix from the M CSI feedback precoding matrix codebooks, and form the first precoding matrix codebook by using the selected precoding matrix, where for:
- the selected precoding matrix is added to the first precoding matrix codebook.
- the network device further includes a receiving module 301;
- the receiving module 301 is configured to: receive a feedback message of the user equipment for the first precoding matrix
- the obtaining module 201 is further configured to re-acquire the first precoding matrix if the feedback message indicates that the PMI corresponding to the first precoding matrix is not the available PMI of the CSI-RS;
- the precoding module 202 is further configured to: if the PMI corresponding to the first precoding matrix is not an available PMI of the CSI-RS, continue to pair the CSI-RS according to the first precoding matrix Performing precoding; the sending module 203 is further configured to: send the pre-coded CSI-RS Send to the user equipment.
- the receiving module 301 is specifically configured to: receive the feedback message of the user equipment for the first precoding matrix by using a PUCCH, an EPUCCH, or a PUSCH.
- the sending module 203 is specifically configured to: send the pre-coded CSI-RS to the user equipment by using a PDCCH or an EPDCCH.
- an embodiment of the present invention provides a user equipment, where the user equipment includes a receiving module, where the receiving module is configured to receive a pre-coded CSI-RS sent by a network device, where the pre-encoding is performed.
- the CSI-RS is obtained by the network device precoding the CSI-RS according to the obtained first precoding matrix.
- the user equipment further includes: a sending module, configured to: send, to the network device, a feedback message for the first precoding matrix.
- the user equipment further includes: a comparison module, configured to: compare the parameter of the pre-coded CSI-RS with a preset parameter threshold, and generate, according to the comparison result, the A feedback message of a precoding matrix.
- a comparison module configured to: compare the parameter of the pre-coded CSI-RS with a preset parameter threshold, and generate, according to the comparison result, the A feedback message of a precoding matrix.
- the comparing module is specifically configured to:
- the comparison result is that the PMI corresponding to the first precoding matrix is an available PMI of the CSI-RS, and generates a feedback message for the first precoding matrix according to the comparison result;
- an embodiment of the present invention provides a network device, which may include a memory 401, a processor 402, and a transmitter connected to the same bus 400. 403.
- a memory 401 configured to store instructions required by the processor 402 to perform a task
- the processor 402 is configured to execute an instruction stored in the memory 401, obtain a first precoding matrix, and perform precoding on the CSI-RS according to the first precoding matrix;
- the transmitter 403 is configured to send the pre-coded CSI-RS to the user equipment.
- the processor 402 is configured to obtain the first precoding matrix, specifically:
- a precoding matrix corresponding to the determined number of ports is selected from the first precoding matrix codebook as the first precoding matrix.
- the processor 402 is further configured to: execute the instruction, select a precoding matrix corresponding to the number of ports from the first precoding matrix codebook as the first precoding Before the matrix, the precoding matrix is selected from the M CSI feedback precoding matrix codebooks, and the first precoding matrix codebook is formed by the selected precoding matrix, where the first precoding matrix codebook includes at least The precoding matrix of two ports, M is a positive integer.
- the processor 402 is further configured to: select a precoding matrix from the M CSI feedback precoding matrix codebooks, and form the first precoding matrix codebook by using the selected precoding matrix, specifically for:
- the selected precoding matrix is added to the first precoding matrix codebook.
- the network device further includes a receiver 501 connected to the bus 400;
- the receiver 501 is configured to: receive a feedback message of the user equipment for the first precoding matrix
- the processor 402 is further configured to: if the feedback message indicates a pre-corresponding to the first pre-coding matrix And the coding matrix indicates that the PMI is not the available PMI of the CSI-RS, and the first precoding matrix is re-acquired; otherwise, the CSI-RS is pre-coded according to the first precoding matrix, and passes through the transmitter 403. Transmitting the precoded CSI-RS to the user equipment.
- the receiver 501 is specifically configured to: receive the feedback message of the user equipment for the first precoding matrix by using a PUCCH, an EPUCCH, or a PUSCH.
- the transmitter 403 is specifically configured to: send the pre-coded CSI-RS to the user equipment by using a PDCCH or an EPDCCH.
- an embodiment of the present invention provides a user equipment, including a receiver 601 connected to a bus 600, where the receiver 601 is configured to: receive a pre-coded CSI-RS sent by a network device; And the pre-coded CSI-RS is obtained by the network device pre-coding the CSI-RS according to the acquired first pre-coding matrix.
- the user equipment further includes a transmitter 701 connected to the bus 600, configured to: send a feedback message to the network device for the first precoding matrix.
- the user equipment further includes a memory 702 and a processor 703 connected to the bus 600; wherein
- a memory 702 configured to store an instruction
- the processor 703 is configured to execute the instruction, compare the parameter of the pre-coded CSI-RS with a preset parameter threshold, and generate a feedback message for the first pre-coding matrix according to the comparison result.
- the processor 703 is specifically configured to:
- comparing the parameter of the pre-coded CSI-RS with a preset parameter threshold determining, if the relationship between the parameter of the pre-coded CSI-RS and the preset parameter threshold does not satisfy the preset condition, determining that the comparison result is a PMI corresponding to the first pre-coding matrix Not the available PMI of the CSI-RS, and generating a feedback message for the first precoding matrix based on the comparison result.
- An embodiment of the present invention provides a CSI-RS transmission method, where the method includes: a network device acquiring a first precoding matrix; and the network device precoding the CSI-RS according to the first precoding matrix; The network device sends the pre-coded CSI-RS to the user equipment.
- the CSI-RS when the network device is to transmit the CSI-RS to the user equipment, the CSI-RS is first pre-coded according to the obtained precoding matrix, which is equivalent to performing beaming on the CSI-RS. Forming, and transmitting the pre-coded CSI-RS to the user equipment, so that after receiving the pre-coded CSI-RS, the user equipment may set the parameters of the pre-coded CSI-RS Comparing with the preset parameter threshold, for example, if the relationship between the parameter of the pre-coded CSI-RS and the preset parameter threshold satisfies a preset condition, the user equipment determines that the received signal has a larger power.
- the power consumption is small, which is equivalent to the fact that after the beamforming of the CSI-RS, the transmission direction of the pre-coded CSI-RS is substantially aligned with the user equipment, so the user equipment receives If the power of the precoded CSI-RS is large, the user equipment determines that the CSI-RS may be precoded with the precoding matrix, and if the precoded CSI-RS The relationship between the parameter and the preset parameter threshold does not satisfy the The preset condition is that the user equipment determines that the received signal has a small power and a large power waste, which is equivalent to the transmit direction of the pre-coded CSI-RS after beamforming the CSI-RS.
- the user equipment determines that the CSI-RS may be continued without using the precoding matrix.
- the network device re-determines the precoding mode of the CSI-RS, for example, reselecting the precoding matrix to precode the CSI-RS, and then transmitting the re-coded CSI-RS.
- the user equipment is judged, as such, until the appropriate precoding matrix is selected for the user equipment.
- a method of beamforming at the transmitting end is adopted to improve the transmitting power. Utilization rate. Due to the beamforming, the effective coverage of the CSI-RS can be greatly improved, that is, the CSI-RS is transmitted to each user equipment as much as possible, thereby improving the data throughput and performance of the entire system, and transmitting data for the control layer plane and the data plane. Performance improvements play a key role.
- the disclosed system, apparatus, and method may be implemented in other manners.
- the device embodiments described above are merely illustrative.
- the division of the unit or unit is only a logical function division.
- there may be another division manner for example, multiple units or components may be used. Combinations can be integrated into another system, or some features can be ignored or not executed.
- the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
- the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
- each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
- the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
- the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
- a computer device which may be a personal computer, a server, or a network device, etc.
- a processor Processor
- the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .
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Abstract
Description
Claims (35)
- 一种信道状态指示参考信号CSI-RS传输方法,其特征在于,包括:网络设备获取第一预编码矩阵;所述网络设备根据所述第一预编码矩阵对CSI-RS进行预编码;所述网络设备将预编码后的CSI-RS发送给用户设备。
- 如权利要求1所述的方法,其特征在于,所述网络设备获取第一预编码矩阵,包括:所述网络设备确定向所述用户设备发送所述CSI-RS使用的端口数目;所述网络设备从第一预编码矩阵码本中选择与所述确定的端口数目对应的预编码矩阵作为所述第一预编码矩阵。
- 如权利要求2所述的方法,其特征在于,在所述网络设备从第一预编码矩阵码本中选择与所述端口数目对应的预编码矩阵作为所述第一预编码矩阵之前,还包括:所述网络设备从M个CSI反馈预编码矩阵码本中选择预编码矩阵,由选择的预编码矩阵构成所述第一预编码矩阵码本,所述第一预编码矩阵码本中包括对应于至少两个端口的预编码矩阵,M为正整数。
- 如权利要求3所述的方法,其特征在于,所述网络设备从M个CSI反馈预编码矩阵码本中选择预编码矩阵,由选择的预编码矩阵构成所述第一预编码矩阵码本,包括:所述网络设备从第i个CSI反馈预编码矩阵码本中选择层数与所述确定的端口数目相等的预编码矩阵,其中i为正整数,且1<i≤M;所述网络设备将所选择的预编码矩阵添加到所述第一预编码矩阵码本中。
- 如权利要求1-4任一所述的方法,其特征在于,还包括:所述网络设备接收所述用户设备针对所述第一预编码矩阵的反馈消息;若所述反馈消息指示所述第一预编码矩阵对应的预编码矩阵指示PMI不是所述CSI-RS的可用PMI,则所述网络设备重新获取所述第一预编码矩阵;否则 所述用户设备继续根据所述第一预编码矩阵对所述CSI-RS进行预编码,并将所述预编码后的CSI-RS发送给所述用户设备。
- 如权利要求5所述的方法,其特征在于,所述网络设备接收所述用户设备针对所述第一预编码矩阵的反馈消息包括:所述网络设备通过物理上行控制信道PUCCH、增强型物理上行控制信道EPUCCH、或上行数据信道PUSCH接收所述用户设备针对所述第一预编码矩阵的反馈消息。
- 如权利要求5所述的方法,其特征在于,若所述反馈消息指示所述第一预编码矩阵对应的PMI是所述CSI-RS的可用PMI,则所述反馈消息中包括所述PMI或用于确认所述PMI为所述CSI-RS的可用PMI的确认信息;若所述反馈消息指示所述第一预编码矩阵对应的PMI不是所述CSI-RS的可用PMI,则所述反馈消息中包括重新获取所述第一预编码矩阵的指示信息或用于确认所述PMI不是所述CSI-RS的可用PMI的确认信息。
- 如权利要求1-7任一所述的方法,其特征在于,所述网络设备将预编码后的CSI-RS发送给用户设备,包括:所述网络设备通过物理下行控制信道PDCCH或增强型物理下行控制信道EPDCCH将所述预编码后的CSI-RS发送给所述用户设备。
- 一种信道状态指示参考信号CSI-RS传输方法,其特征在于,包括:用户设备接收网络设备发送的预编码后的CSI-RS;其中,所述预编码后的CSI-RS为所述网络设备根据获取的第一预编码矩阵对CSI-RS进行预编码得到的。
- 如权利要求9所述的方法,其特征在于,还包括:所述用户设备向所述网络设备发送针对所述第一预编码矩阵的反馈消息。
- 如权利要求10所述的方法,其特征在于,还包括:所述用户设备将所述预编码后的CSI-RS的参数与预设参数阈值进行比较,根据比较结果生成针对所述第一预编码矩阵的反馈消息。
- 如权利要求11所述的方法,其特征在于,所述用户设备将所述预编码后的CSI-RS的参数与预设参数阈值进行比较,根据比较结果生成针对所述第一预编码矩阵的反馈消息,包括:所述用户设备将所述预编码后的CSI-RS的参数与预设参数阈值进行比较,若所述预编码后的CSI-RS的参数与所述预设参数阈值之间的关系满足预设条件,则确定所述比较结果为所述第一预编码矩阵对应的预编码矩阵指示PMI是所述CSI-RS的可用PMI,并根据所述比较结果生成针对所述第一预编码矩阵的反馈消息;或所述用户设备将所述预编码后的CSI-RS的参数与预设参数阈值进行比较,若所述预编码后的CSI-RS的参数与所述预设参数阈值之间的关系不满足所述预设条件,则确定所述比较结果为所述第一预编码矩阵对应的PMI不是所述CSI-RS的可用PMI,并根据所述比较结果生成针对所述第一预编码矩阵的反馈消息。
- 如权利要求9-12任一所述的方法,其特征在于,若所述反馈消息指示所述第一预编码矩阵对应的PMI是所述CSI-RS的可用PMI,则所述反馈消息中包括所述PMI或用于确认所述PMI为所述CSI-RS的可用PMI的确认信息;若所述反馈消息指示所述第一预编码矩阵对应的PMI不是所述CSI-RS的可用PMI,则所述反馈消息中包括重选获取所述第一预编码矩阵的指示信息或用于确认所述PMI不是所述CSI-RS的可用PMI的确认信息。
- 一种网络设备,其特征在于,包括:获取模块,用于获取第一预编码矩阵;预编码模块,用于根据所述第一预编码矩阵对信道状态指示参考信号CSI-RS进行预编码;发送模块,用于将预编码后的CSI-RS发送给用户设备。
- 如权利要求14所述的网络设备,其特征在于,所述获取模块具体用于:确定向所述用户设备发送所述CSI-RS使用的端口数目;从第一预编码矩阵码本中选择与所述确定的端口数目对应的预编码矩阵作为所述第一预编码矩阵。
- 如权利要求15所述的网络设备,其特征在于,所述获取模块还用于:在从第一预编码矩阵码本中选择与所述端口数目对应的预编码矩阵作为所述第一预编码矩阵之前,从M个CSI反馈预编码矩阵码本中选择预编码矩阵,由选择的预编码矩阵构成所述第一预编码矩阵码本,所述第一预编码矩阵码本中包括对应于至少两个端口的预编码矩阵,M为正整数。
- 如权利要求16所述的网络设备,其特征在于,所述获取模块还用于:从第i个CSI反馈预编码矩阵码本中选择层数与所述确定的端口数目相等的预编码矩阵,其中i为正整数,且1<i≤M;将所选择的预编码矩阵添加到所述第一预编码矩阵码本中。
- 如权利要求14-17任一所述的网络设备,其特征在于,所述网络设备还包括接收模块,用于:接收所述用户设备针对所述第一预编码矩阵的反馈消息;若所述反馈消息指示所述第一预编码矩阵对应的预编码矩阵指示PMI不是所述CSI-RS的可用PMI,则所述获取模块重新获取所述第一预编码矩阵;若所述反馈消息指示所述第一预编码矩阵对应的PMI不是所述CSI-RS的可用PMI,则所述预编码模块继续根据所述第一预编码矩阵对所述CSI-RS进行预编码;所述发送模块将所述预编码后的CSI-RS发送给所述用户设备。
- 如权利要求18所述的网络设备,其特征在于,所述接收模块具体用于:通过物理上行控制信道PUCCH、增强型物理上行控制信道EPUCCH、或上行数据信道PUSCH接收所述用户设备针对所述第一预编码矩阵的反馈消息。
- 如权利要求14-19任一所述的网络设备,其特征在于,所述发送模块具体用于:通过物理下行控制信道PDCCH或增强型物理下行控制信道EPDCCH将所述预编码后的CSI-RS发送给所述用户设备。
- 一种用户设备,其特征在于,包括:接收模块,用于接收网络设备发送的预编码后的信道状态指示参考信号CSI-RS;其中,所述预编码后的CSI-RS为所述网络设备根据获取的第一预编码矩阵对CSI-RS进行预编码得到的。
- 如权利要求21所述的用户设备,其特征在于,所述用户设备还包括发送模块,用于:向所述网络设备发送针对所述第一预编码矩阵的反馈消息。
- 如权利要求22所述的用户设备,其特征在于,所述用户设备还包括比较模块,用于:将所述预编码后的CSI-RS的参数与预设参数阈值进行比较,根据比较结果生成针对所述第一预编码矩阵的反馈消息。
- 如权利要求23所述的用户设备,其特征在于,所述比较模块具体用于:将所述预编码后的CSI-RS的参数与预设参数阈值进行比较,若所述预编码后的CSI-RS的参数与所述预设参数阈值之间的关系满足预设条件,则确定所述比较结果为所述第一预编码矩阵对应的预编码矩阵指示PMI是所述CSI-RS的可用PMI,并根据所述比较结果生成针对所述第一预编码矩阵的反馈消息;或将所述预编码后的CSI-RS的参数与预设参数阈值进行比较,若所述预编码后的CSI-RS的参数与所述预设参数阈值之间的关系不满足所述预设条件,则确定所述比较结果为所述第一预编码矩阵对应的PMI不是所述CSI-RS的可用PMI,并根据所述比较结果生成针对所述第一预编码矩阵的反馈消息。
- 一种网络设备,其特征在于,包括连接到同一总线的存储器、处理器和发送器;其中,所述存储器,用于存储指令;所述处理器,用于执行所述指令,获取第一预编码矩阵,根据所述第一预编码矩阵对信道状态指示参考信号CSI-RS进行预编码;所述发送器,用于将预编码后的CSI-RS发送给用户设备。
- 如权利要求25所述的网络设备,其特征在于,所述处理器具体用于:确定向所述用户设备发送所述CSI-RS使用的端口数目;从第一预编码矩阵码本中选择与所述确定的端口数目对应的预编码矩阵作 为所述第一预编码矩阵。
- 如权利要求26所述的网络设备,其特征在于,所述处理器还用于:执行所述指令,在从第一预编码矩阵码本中选择与所述端口数目对应的预编码矩阵作为所述第一预编码矩阵之前,从M个CSI反馈预编码矩阵码本中选择预编码矩阵,由选择的预编码矩阵构成所述第一预编码矩阵码本,所述第一预编码矩阵码本中包括对应于至少两个端口的预编码矩阵,M为正整数。
- 如权利要求27所述的网络设备,其特征在于,所述处理器还用于:从第i个CSI反馈预编码矩阵码本中选择层数与所述确定的端口数目相等的预编码矩阵,其中i为正整数,且1<i≤M;将所选择的预编码矩阵添加到所述第一预编码矩阵码本中。
- 如权利要求25-28任一所述的网络设备,其特征在于,所述网络设备还包括连接到所述总线的接收器;所述接收器用于:接收所述用户设备针对所述第一预编码矩阵的反馈消息;所述处理器还用于:若所述反馈消息指示所述第一预编码矩阵对应的预编码矩阵指示PMI不是所述CSI-RS的可用PMI,则重新获取所述第一预编码矩阵;否则继续根据所述第一预编码矩阵对所述CSI-RS进行预编码,并通过所述发送器将所述预编码后的CSI-RS发送给所述用户设备。
- 如权利要求29所述的网络设备,其特征在于,所述接收器具体用于:通过物理上行控制信道PUCCH、增强型物理上行控制信道EPUCCH、或上行数据信道PUSCH接收所述用户设备针对所述第一预编码矩阵的反馈消息。
- 如权利要求25-30任一所述的网络设备,其特征在于,所述发送器具体用于:通过物理下行控制信道PDCCH或增强型物理下行控制信道EPDCCH将所述预编码后的CSI-RS发送给所述用户设备。
- 一种用户设备,其特征在于,包括连接到总线的接收器;所述接收器用于:接收网络设备发送的预编码后的信道状态指示参考信号CSI-RS;其中,所述预编码后的CSI-RS为所述网络设备根据获取的第一预编码 矩阵对CSI-RS进行预编码得到的。
- 如权利要求32所述的用户设备,其特征在于,所述用户设备还包括连接到所述总线的发送器,用于:向所述网络设备发送针对所述第一预编码矩阵的反馈消息。
- 如权利要求33所述的用户设备,其特征在于,所述用户设备还包括连接到所述总线的存储器和处理器;其中,所述存储器,用于存储指令;所述处理器,用于执行所述指令,将所述预编码后的CSI-RS的参数与预设参数阈值进行比较,根据比较结果生成针对所述第一预编码矩阵的反馈消息。
- 如权利要求34所述的用户设备,其特征在于,所述处理器具体用于:执行所述指令,将所述预编码后的CSI-RS的参数与预设参数阈值进行比较,若所述预编码后的CSI-RS的参数与所述预设参数阈值之间的关系满足预设条件,则确定所述比较结果为所述第一预编码矩阵对应的预编码矩阵指示PMI是所述CSI-RS的可用PMI,并根据所述比较结果生成针对所述第一预编码矩阵的反馈消息;或执行所述指令,将所述预编码后的CSI-RS的参数与预设参数阈值进行比较,若所述预编码后的CSI-RS的参数与所述预设参数阈值之间的关系不满足所述预设条件,则确定所述比较结果为所述第一预编码矩阵对应的PMI不是所述CSI-RS的可用PMI,并根据所述比较结果生成针对所述第一预编码矩阵的反馈消息。
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- 2014-12-31 WO PCT/CN2014/095991 patent/WO2016106721A1/zh active Application Filing
- 2014-12-31 CN CN201480080924.5A patent/CN106576387B/zh active Active
- 2014-12-31 US US15/541,325 patent/US10224988B2/en active Active
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CN102104994A (zh) * | 2009-12-21 | 2011-06-22 | 上海贝尔股份有限公司 | 在mimo系统中向用户发射数据的方法和基站 |
CN102948096A (zh) * | 2010-06-21 | 2013-02-27 | 富士通株式会社 | 用于无线通信系统的信道状态信息反馈的方法和设备 |
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Also Published As
Publication number | Publication date |
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JP2018504835A (ja) | 2018-02-15 |
CN106576387B (zh) | 2019-11-12 |
JP6501892B2 (ja) | 2019-04-17 |
EP3232730A1 (en) | 2017-10-18 |
EP3461167A1 (en) | 2019-03-27 |
US20170359110A1 (en) | 2017-12-14 |
EP3232730A4 (en) | 2018-02-28 |
CN106576387A (zh) | 2017-04-19 |
US10224988B2 (en) | 2019-03-05 |
EP3461167B1 (en) | 2020-12-23 |
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