CN111435886B - Feedback method and device for Channel State Information (CSI) - Google Patents

Feedback method and device for Channel State Information (CSI) Download PDF

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Publication number
CN111435886B
CN111435886B CN201910028408.2A CN201910028408A CN111435886B CN 111435886 B CN111435886 B CN 111435886B CN 201910028408 A CN201910028408 A CN 201910028408A CN 111435886 B CN111435886 B CN 111435886B
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csi
precoding matrix
base station
codebook
parameter information
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CN111435886A (en
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李辉
高秋彬
陈润华
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Datang Mobile Communications Equipment Co Ltd
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Datang Mobile Communications Equipment Co Ltd
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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
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • 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
    • 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
    • H04B7/0486—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking channel rank into account
    • 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
    • H04B7/06—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
    • 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
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
    • 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
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • 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
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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

Abstract

The invention provides a feedback method and a device of Channel State Information (CSI), which relate to the technical field of communication, and the method comprises the following steps: the terminal equipment acquires an uplink channel resource indication allocated by a base station and codebook parameter information configured by the base station; if the terminal equipment determines that the resource cost of the first CSI needing to be fed back to the base station is larger than the resource cost corresponding to the uplink channel resource indication, the terminal equipment determines a second CSI according to codebook parameter information configured by the base station and feeds back the second CSI to the base station; and the resource cost of the second CSI is smaller than or equal to the resource cost corresponding to the uplink channel resource indication. The terminal equipment adjusts the first precoding matrix according to the codebook parameter information configured by the base station to obtain a second precoding matrix, determines second CSI through the second precoding matrix, and ensures that the overhead of the second CSI is smaller than that of the first CSI and accords with the uplink channel resource indication configured by the base station.

Description

Feedback method and device for Channel State Information (CSI)
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for feeding back channel state information CSI.
Background
Mobile and broadband are the direction of development of modern communication technologies, and the 5G, fifth generation mobile phone mobile communication standard, also called fifth generation mobile communication technology, is also an extension after 4G. As a main direction of development of new generation information communication, 5G will penetrate into various fields of future society, and an omnidirectional information ecosystem is built with users as the center.
In the 3GPP Rel-15 5G new air interface (NR) standard, according to uplink channel resources allocated by a base station and predefined code rate requirements of a system, a terminal can discard subband amplitude/phase of odd subbands in a second part of CSI, subband amplitude/phase of even subbands and the rest of second part of CSI information in sequence according to priority until the code rate requirements are met. Aiming at the high overhead problem of the Rel-15 codebook, a low overhead codebook structure is provided, a low overhead Type II codebook is defined in NR Rel-16, the coefficients of each sub-band are compressed, and the compressed coefficients are fed back to the base station.
However, since the coefficients of the codebook are all full bandwidth and no subband coefficients exist, the CSI reporting mode of Rel-15, which discards the codebook coefficients by half of the subbands, cannot be used. There is currently no CSI reporting scheme for the Rel-16 codebook structure.
Disclosure of Invention
The invention provides a method and a device for feeding back Channel State Information (CSI), which are used for solving the problem that a CSI reporting scheme aiming at a Rel-16 codebook structure does not exist in the prior art.
In one aspect, the present invention provides a feedback method for channel state information CSI, including:
the terminal equipment acquires an uplink channel resource indication allocated by a base station and codebook parameter information configured by the base station;
if the terminal equipment determines that the resource cost of the first CSI needing to be fed back to the base station is larger than the resource cost corresponding to the uplink channel resource indication, the terminal equipment determines a second CSI according to codebook parameter information configured by the base station and feeds back the second CSI to the base station; and the resource cost of the second CSI is smaller than or equal to the resource cost corresponding to the uplink channel resource indication.
Further, the method further comprises:
the terminal equipment determines the first CSI according to a first precoding matrix;
the terminal equipment determines a second CSI according to codebook parameter information configured by the base station, and the method comprises the following steps:
the terminal equipment determines a second precoding matrix according to the codebook parameter information and the first precoding matrix;
And the terminal determines second CSI according to the second precoding matrix.
Further, the method further comprises:
the terminal equipment acquires the expansion factor corresponding to the codebook parameter information;
the terminal equipment determines a second precoding matrix according to the codebook parameter information and the first precoding matrix, and the method comprises the following steps:
and the terminal equipment determines a second precoding matrix according to the codebook parameter information, the first precoding matrix and the spreading factor.
Further, the determining, by the terminal device, a second precoding matrix according to the codebook parameter information and the first precoding matrix includes:
the terminal equipment adjusts precoding matrix information corresponding to the codebook parameter information in the first precoding matrix according to the codebook parameter information to obtain the second precoding matrix; and precoding matrix information corresponding to the codebook parameter information in the second precoding matrix is smaller than or equal to the codebook parameter information.
Further, the determining, by the terminal device, a second precoding matrix according to the codebook parameter information, the first precoding matrix, and the spreading factor includes:
And the terminal equipment adjusts precoding matrix information corresponding to the codebook parameter information in the first precoding matrix according to the spreading factor and the codebook parameter information corresponding to the spreading factor to obtain the second precoding matrix.
Further, the codebook parameter information at least includes any one or a combination of the following information:
the sum of the number of basis vectors used by all layers of the precoding matrix;
the sum of the number of different synthesized beams used by all layers of the precoding matrix;
the maximum number of basis vectors used by each layer of the precoding matrix;
the maximum number of synthesized beams used by each layer of the precoding matrix;
the sum of the product of the number of coefficients of all layers of the precoding matrix.
In the embodiment of the invention, the terminal equipment adjusts the used first precoding matrix according to the codebook parameter information configured by the base station to obtain the second precoding matrix, and determines the second CSI through the second precoding matrix, and the cost of the precoding matrix is reduced due to the adjustment of the matrix information in the first precoding matrix, so that the cost of the generated second CSI is smaller than that of the first CSI, and the uplink channel resource indication configured by the base station is met.
In one aspect, an embodiment of the present invention provides a method for feeding back channel state information CSI, where the method includes:
the terminal equipment acquires an uplink channel resource indication allocated by the base station;
if the terminal equipment determines that the resource cost of the first CSI needing to be fed back to the base station is larger than the resource cost corresponding to the uplink channel resource indication, the terminal equipment determines a second CSI according to a preset rule and feeds back the second CSI to the base station; and the resource cost of the second CSI is smaller than or equal to the resource cost corresponding to the uplink channel resource indication.
Further, the determining, by the terminal device, the second CSI according to a preset rule includes:
the terminal equipment determines the second CSI according to the first N feedback layers of M feedback layers corresponding to the first CSI, wherein N is greater than or equal to 1, and M is greater than N; or alternatively
And the terminal equipment discards the sub-band CQI in the first CSI to obtain the second CSI.
Further, the method further comprises:
the terminal equipment determines the first CSI according to the first codebook;
the terminal equipment determines a second CSI according to a preset rule, and the method comprises the following steps:
the terminal equipment determines a third CSI according to the second codebook;
And the terminal equipment discards the part matched with the feedback rule in the third CSI according to the feedback rule of the second codebook to obtain the second CSI, wherein the cost of the second codebook is larger than that of the first codebook.
In the embodiment of the invention, when determining that the cost of the CSI fed back to the base station is greater than the reporting cost of the base station configuration, the terminal determines that the second CSI is reported to the base station through a preset rule, wherein the cost of the second CSI is less than or equal to the reporting cost of the base station configuration.
In one aspect, an embodiment of the present invention further provides a feedback device for channel state information CSI, including:
a first obtaining unit, configured to obtain an uplink channel resource indication allocated by a base station and codebook parameter information configured by the base station;
the first CSI feedback unit is used for determining a second CSI according to codebook parameter information configured by the base station and feeding back the second CSI to the base station if the resource cost of the first CSI required to be fed back to the base station is larger than the resource cost corresponding to the uplink channel resource indication; and the resource cost of the second CSI is smaller than or equal to the resource cost corresponding to the uplink channel resource indication.
Further, the first acquisition unit is further configured to:
Determining the first CSI according to a first precoding matrix;
the first CSI feedback unit is specifically configured to:
determining a second precoding matrix according to the codebook parameter information and the first precoding matrix;
and determining second CSI according to the second precoding matrix.
Further, the first acquisition unit is further configured to:
acquiring an expansion factor corresponding to the codebook parameter information;
the first CSI feedback unit is specifically configured to:
and determining a second precoding matrix according to the codebook parameter information, the first precoding matrix and the spreading factor.
Further, the first CSI feedback unit is specifically configured to:
adjusting precoding matrix information corresponding to the codebook parameter information in the first precoding matrix according to the codebook parameter information to obtain the second precoding matrix; and precoding matrix information corresponding to the codebook parameter information in the second precoding matrix is smaller than or equal to the codebook parameter information.
Further, the first CSI feedback unit is specifically configured to:
and adjusting precoding matrix information corresponding to the codebook parameter information in the first precoding matrix according to the spreading factor and the codebook parameter information corresponding to the spreading factor to obtain the second precoding matrix.
Further, the codebook parameter information at least includes any one or a combination of the following information:
the sum of the number of basis vectors used by all layers of the precoding matrix;
the sum of the number of different synthesized beams used by all layers of the precoding matrix;
the maximum number of basis vectors used by each layer of the precoding matrix;
the maximum number of synthesized beams used by each layer of the precoding matrix;
the sum of the product of the number of coefficients of all layers of the precoding matrix.
The embodiment of the invention also provides electronic equipment, which comprises:
at least one processor; the method comprises the steps of,
a memory communicatively coupled to the at least one processor; wherein, the liquid crystal display device comprises a liquid crystal display device,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform any one of the methods described above.
Embodiments of the present invention also provide a non-transitory computer readable storage medium storing computer instructions for causing the computer to perform any of the methods described above.
In one aspect, an embodiment of the present invention further provides a feedback device for channel state information CSI, including:
A second obtaining unit, configured to obtain an uplink channel resource indication allocated by the base station;
the second CSI feedback unit is used for determining a second CSI according to a preset rule and feeding back the second CSI to the base station if the resource cost of the first CSI which needs to be fed back to the base station is larger than the resource cost corresponding to the uplink channel resource indication; and the resource cost of the second CSI is smaller than or equal to the resource cost corresponding to the uplink channel resource indication.
Further, the second CSI feedback unit is specifically configured to:
determining the second CSI according to the first N feedback layers of the M feedback layers corresponding to the first CSI, wherein N is greater than or equal to 1, and M is greater than N; or alternatively
And discarding the sub-band CQI in the first CSI to obtain the second CSI.
Further, the second CSI feedback unit is specifically configured to:
determining the first CSI according to the first codebook;
determining a third CSI according to the second codebook;
and discarding the part matched with the feedback rule in the third CSI according to the feedback rule of the second codebook to obtain the second CSI, wherein the cost of the second codebook is larger than that of the first codebook.
The embodiment of the invention also provides electronic equipment, which comprises:
At least one processor; the method comprises the steps of,
a memory communicatively coupled to the at least one processor; wherein, the liquid crystal display device comprises a liquid crystal display device,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform any one of the methods described above.
Embodiments of the present invention also provide a non-transitory computer readable storage medium storing computer instructions for causing the computer to perform any of the methods described above.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it will be apparent that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a communication architecture according to an embodiment of the present invention;
fig. 2 is a flow chart of a feedback method of channel state information CSI according to an embodiment of the present invention;
Fig. 3 is a flow chart of a feedback method of channel state information CSI according to an embodiment of the present invention;
fig. 4 is a flow chart of a feedback method of channel state information CSI according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a feedback device for channel state information CSI according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a feedback device for channel state information CSI according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic architecture diagram of a communication system according to an embodiment of the present invention; the communication system includes a network-side device 101 and a terminal device 102. Wherein the terminal device 102 and the network-side device 101 communicate with each other via some air interface technology. The air interface technique may include: 2G (e.g., global system for mobile communications gsm), 3G (e.g., universal mobile telecommunications system UMTS, wideband code division multiple access, WCDMA), time division synchronous code division multiple access, TD-SCDMA), 4G (e.g., FDD LTE, TDD LTE), and New RAT systems, e.g., 5G systems, etc.
The terminal device 102 described in the embodiments of the present invention will be described in terms of a UE in general. The terminal device 102 may also be referred to as a mobile station, access terminal, subscriber unit, subscriber station, mobile station, remote terminal, mobile device, user terminal, user equipment, wireless communication device, user agent, user equipment, or the like. The user equipment may be a cellular telephone, a cordless telephone, a session initiation protocol (english: session Initiation Protocol, SIP) phone, a wireless local loop (english: wirelessLocal Loop, WLL) station, a personal digital assistant (english: personalDigital Assistant, PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a car-mounted device, a wearable device, and a mobile station in a 5G network or a user equipment in a future evolved public land mobile network (english: public LandMobile Network, PLMN) network, etc. In addition, in the embodiment of the present invention, the terminal device 102 may further include other devices capable of performing data communication with the network side device 101 (e.g., a base station), such as a Relay (english: relay).
In the embodiment of the present invention, the base stations refer to the network side device 101, and are not described in detail below.
In NR Rel-15, the TypeII codebook is defined. Which supports Rank1 and Rank2 codebooks based on the manner in which beams within orthogonal beam groups are linearly combined. For one subband, the Rank1 codebook is expressed as:
the Rank2 codebook is expressed as:
wherein the method comprises the steps ofL represents the number of orthogonal beams within the group, +.>Represents orthogonal beams, which use 2D DFT vectors, r=0, 1 represents a first polarization direction and a second polarization direction in a dual polarized antenna array, and l=0, 1 represents a layer. />Representing wideband amplitude quantization factors acting on beam i, polarization direction r and layer l in the beam set; />Representing subband amplitude quantization factors acting on beam i, polarization direction r and layer l in the beam set; c r,l,i Indicating the subband phase quantization factors acting on beam i, polarization direction r and layer l in the beam set.
And a low-overhead Type II codebook is defined in NR Rel-16, which compresses the coefficients of each subband and feeds the compressed coefficients back to the base station. For a Type II codebook of rank=2, layer one precoding is expressed as:
layer two precoding is expressed as:
wherein W is 1 The orthogonal combined beam contained in the method is the same as the Type II codebook of Rel-15;and->Representing the compressed coefficients of layer one and layer two, respectively, corresponding +. >And->Representing the amplitude coefficient +.>And->Representing phase coefficients, the coefficients of each layer need to be fed back to the base station; w (W) f,0 And W is f,1 Representing compressed basis vector matrices, each matrix comprising M basis vectors, each vector having a length N, which is determined by the number of subbands.
Based on the foregoing, an embodiment of the present invention provides a feedback method of channel state information CSI, as shown in fig. 2, including:
step 201, a terminal device obtains an uplink channel resource indication allocated by a base station and codebook parameter information configured by the base station;
step 202, if the terminal device determines that the resource overhead of the first CSI required to be fed back to the base station is greater than the resource overhead corresponding to the uplink channel resource indication, the terminal device determines a second CSI according to codebook parameter information configured by the base station, and feeds back the second CSI to the base station; and the resource cost of the second CSI is smaller than or equal to the resource cost corresponding to the uplink channel resource indication.
In step 201, the terminal device receives an uplink channel resource indication sent by the base station and used for performing CSI feedback, and receives codebook parameter information sent by the base station, where the codebook parameter information is configured by the base station and is used for indicating a maximum support parameter for the terminal device to feed back CSI information.
In step 202, when the terminal device determines that the resource overhead of the CSI of the base station that needs to be fed back currently is greater than the resource overhead corresponding to the uplink channel resource indication configured by the base station, the feedback mechanism of the CSI needs to be adjusted, so that the adjusted CSI matches with the resource overhead corresponding to the uplink channel resource indication.
In the embodiment of the invention, the terminal equipment determines a new second CSI according to the codebook parameters configured by the base station, and the resource overhead of the second CSI is less than or equal to the resource overhead corresponding to the uplink channel resource indication.
Optionally, in the embodiment of the present invention, the terminal device determines the first CSI according to the first precoding matrix, that is, the terminal device determines the current channel transmission quality, determines the first precoding matrix according to the current channel transmission quality, and determines the first CSI by using the first precoding matrix, that is, the content of the first CSI includes at least rank RI, wideband CQI, subband CQI and PMI.
In the embodiment of the invention, because the resource expense of the first CSI is larger than the resource expense corresponding to the uplink channel resource indication, the CSI feedback expense can be reduced by adjusting part of matrix information in the first precoding matrix through codebook parameter information configured by the base station.
Specifically, in the embodiment of the present invention, the terminal device determines a second precoding matrix according to the codebook parameter information and the first precoding matrix; and the terminal determines second CSI according to the second precoding matrix.
Optionally, in the embodiment of the present invention, the first precoding matrix may be adjusted by setting a spreading factor corresponding to the codebook parameter information, and part of matrix information in the first precoding matrix may be adjusted to match the codebook parameter information by the spreading factor, and the adjusted first precoding matrix is used as the second precoding matrix, and the second CSI is determined according to the second precoding matrix.
Optionally, in the embodiment of the present invention, if the codebook parameter information is multiple, the spreading factor may also be multiple, that is, each codebook parameter information corresponds to one spreading factor; or the number of the expansion factors is smaller than the number of the codebook parameter information, and the expansion factors correspond to a plurality of codebook parameter information.
Optionally, in the embodiment of the present invention, the spreading factor may be configured by the terminal device, and fed back to the base station after being configured, or may be configured by the base station, and sent to the terminal device.
Optionally, in an embodiment of the present invention, the codebook parameter information includes at least any one or a combination of the following information:
the sum of the number of basis vectors used by all layers of the precoding matrix;
the sum of the number of different synthesized beams used by all layers of the precoding matrix;
the maximum number of basis vectors used by each layer of the precoding matrix;
the maximum number of synthesized beams used by each layer of the precoding matrix;
the sum of the product of the number of coefficients of all layers of the precoding matrix.
The coefficient number product of all layers of the precoding matrix is obtained according to the product of the number of the synthesized beams used by each layer and the base vector number of the layer.
For example, in the embodiment of the present invention, the codebook parameter information is the sum of the numbers of base vectors used by all layers of the precoding matrix, and the sum of the numbers of total base vectors may be made not to exceed the sum of the numbers of base vectors configured by the base station by adjusting the base vector used by each layer in the first precoding matrix.
Or in the embodiment of the present invention, the codebook parameter information is the maximum number of base vectors used by each layer of the precoding matrix, and the sum of the total number of base vectors does not exceed the maximum number of base vectors used by each layer by adjusting the maximum number of base vectors used by each layer in the first precoding matrix.
In order to better explain the process of determining the second precoding matrix through the codebook parameter information provided by the embodiment of the present invention, it is exemplified herein.
If the terminal equipment determines that RI=2; for a Type II codebook of rank=2, its layer one precoding is expressed as:
layer two precoding is expressed as:
in the formula 5 and the formula 6, W 1 Comprises 2L beams, W f,0 Comprises M0 basis vectors, W f,1 Each of which contains M1 basis vectors. When ri=2, the number of coefficients reported by the terminal isThat is, the first precoding matrix is shown in equation 5 and equation 6.
If the codebook parameter information is determined to be the sum of the numbers of the base vectors used by all layers of the precoding matrix, adjusting the layers to use the base vectors and the base vectors used by the second layer, namely adjusting M0 and M1, so that M0+M1 is less than or equal to the sum of the numbers of the base vectors used by all layers of the codebook parameter information configuration.
Specifically, assuming that the sum of the number of base vectors used by all layers of the codebook parameter information configuration is 7, m0=3 and m1=4 may be set; or m0=4 and m1=3; or m0=2 and m1=5; or m0=5, m1=2; or m0=3, m1=3; or m0=4, m1=2, etc.
In the adjusted first precoding matrix, the values of L are unchanged, the values of M0 and M1 are changed, a second precoding matrix is obtained, and the sum of the number of base vectors used by all layers in the second precoding matrix is smaller than or equal to the sum of the number of base vectors used by all layers configured by codebook parameter information, so that the feedback overhead of the second CSI determined according to the second precoding matrix meets the CSI feedback overhead configured by the base station.
Or in the embodiment of the invention, the codebook parameter information is the sum of coefficient quantity products of all layers of the precoding matrix, namely the configurationTo take on the value of, or->The sum of the coefficient number products of all layers of the second precoding matrix is smaller than or equal to the sum of the coefficient number products of all layers configured by the base station.
Of course, in the embodiment of the present invention, if the values of L used in different layers are different, the terminal device may determine the value of L used in each layer and the value of M used, and the total coefficient overhead does not exceed the uplink channel resource.
Or in the embodiment of the invention, the codebook parameter information configures the maximum number of basis vectors used by each layer of the precoding matrix for the base station, for example, configures max (M i ) 3,i =0, 1. At this time, the base station may allocate uplink channel resources according to each layer mi=3, that is, m0=3, and m1=3, so as to generate the second precoding matrix.
In order to better explain the process of determining the second precoding matrix through the codebook parameter information and the spreading factor provided by the embodiment of the present invention, the description is given here.
If the terminal equipment determines that RI=2; for a Type II codebook of rank=2, its layer one precoding is expressed as:
Layer two precoding is expressed as:
in the formulas 7 and 8, W 1 Comprises 2L beams, W f,0 Comprises M0 basis vectors, W f,1 Each of which contains M1 basis vectors. When ri=2, the number of coefficients reported by the terminal device isThat is, the first precoding matrix is shown in equation 7 and equation 8.
The spreading factor acquired by the terminal equipment is R, the spreading factor corresponds to codebook parameter information which is the sum of the number of base vectors used by all layers of the precoding matrix, namely, a second precoding matrix is determined through the spreading factor R and matrix information corresponding to the codebook parameter information in the first precoding matrix, namely, the number of the base vectors used by each layer in the first precoding matrix is adjusted through the spreading factor R.
In the embodiment of the present invention, by way of example, r=2, m0=4 and m2=6 in the first precoding matrix, and the sum of the numbers of base vectors used by all layers of the precoding matrix configured by the base station is 7, then M0/r=2 base vectors are used as base vectors used by layer one, M1/r=3 base vectors are used as base vectors used by layer two, so as to obtain a second precoding matrix, and the sum of the numbers of base vectors used by all layers in the second precoding matrix is 5, so as to meet the requirement of the sum of the numbers of base vectors used by all layers of the precoding matrix configured by the base station.
Of course, alternatively, in the embodiment of the present invention, the sum of the numbers of the synthesized beams in the first precoding matrix may be adjusted by setting an extension factor corresponding to the sum of the numbers of the different synthesized beams used by all the layers of the precoding matrix, and, by way of example, r=2, l=6, and the sum of the numbers of the different synthesized beams used by all the layers of the base station configuration is 4, l1=l/r=3 may be used as the sum of the numbers of the different synthesized beams used by all the layers of the precoding matrix, so as to obtain a second precoding matrix, where the sum of the numbers of the different synthesized beams used by all the layers of the precoding matrix in the second precoding matrix meets the configuration requirement of the base station.
The scheme of spreading factors for other codebook parameter information, for example, the maximum number of basis vectors used by each layer of the precoding matrix or the maximum number of synthesized beams used by each layer of the precoding matrix or the sum of the coefficient number products of all layers of the precoding matrix is similar to the flow in the above embodiment, and will not be described here again.
In the embodiment of the present invention, the terminal device may further determine a second CSI according to a preset rule, as shown in fig. 3, including:
Step 301, a terminal device obtains an uplink channel resource indication allocated by a base station;
step 302, if the terminal device determines that the resource overhead of the first CSI to be fed back to the base station is greater than the resource overhead corresponding to the uplink channel resource indication, the terminal device determines a second CSI according to a preset rule, and feeds back the second CSI to the base station; and the resource cost of the second CSI is smaller than or equal to the resource cost corresponding to the uplink channel resource indication.
That is, in the embodiment of the present invention, after the terminal device determines that the overhead of the first CSI is greater than the resource overhead configured by the base station, a second CSI may be generated according to the preset rule, where the overhead of the second CSI is less than or equal to the resource overhead configured by the base station, and the second CSI is fed back to the base station.
Specifically, in the embodiment of the present invention, the determining, by the terminal device, the second CSI according to a preset rule includes:
the terminal equipment determines the second CSI according to the first N feedback layers of M feedback layers corresponding to the first CSI, wherein N is greater than or equal to 1, and M is greater than N; or alternatively
And the terminal equipment discards the sub-band CQI in the first CSI to obtain the second CSI.
That is, in the embodiment of the present invention, if the RI determined by the terminal device has 2 layers or more, and when the CSI reported by the terminal device includes precoding matrix information of all the layers, the first N feedback layers are determined to be the second CSI, and the second CSI is reported, where N is greater than or equal to 1 and less than or equal to M, where M is the value of RI.
For example, if the terminal device determines that ri=2 and the feedback overhead of the first CSI determined according to ri=2 is greater than the feedback overhead configured by the base station, the precoding matrix information of the layer two is discarded, and the second CSI is determined according to the new precoding matrix after being discarded.
As can be seen from equations 5 or 6 and equations 7 and 8, discarding the matrix information of the second layer precoding matrix can reduce the information amount of the precoding matrix, so that the overhead of the generated CSI is also reduced.
Or in the embodiment of the invention, the first CSI at least comprises rank RI, wideband CQI, subband CQI and PMI, and the subband CQI in the first CSI can be discarded to obtain the second CSI.
In the embodiment of the present invention, besides the above preset rule, the second CSI may also be determined by using a codebook of other specifications, and since in the prior art, the feedback method of CSI has already been determined for the schemes of the codebooks of other specifications, in the embodiment of the present invention, the feedback of CSI may also be performed by using the codebooks of other specifications, and then according to the feedback method of CSI corresponding to the codebooks of other specifications, specifically, in the embodiment of the present invention, the terminal device determines the first CSI according to the first codebook; the terminal equipment determines a second CSI according to a preset rule, and the method comprises the following steps:
The terminal equipment determines a third CSI according to the second codebook;
and the terminal equipment discards the part matched with the feedback rule in the third CSI according to the feedback rule of the second codebook to obtain the second CSI, wherein the cost of the second codebook is larger than that of the first codebook.
In order to better explain the process of determining the second precoding matrix through the codebook of other specifications provided by the embodiment of the present invention, the description is given here.
In the embodiment of the invention, when the first CSI overhead determined by using the low-overhead Type II codebook of Rel-16 exceeds the uplink channel resource allocated by the base station, the terminal equipment calculates the precoding by adopting the Type II codebook structure of Rel-15.
In Rel-15, the following two-part structure is adopted for reporting CSI corresponding to Type II codebook:
the first part of the CSI comprises RI, broadband CQI corresponding to the first code, differential CQI corresponding to the first code, zero coefficient number of the layer one and zero coefficient number of the layer two. As shown in table 1:
table 1: first partial structure of CSI determined by codebook structure of Rel-15
The second portion of the CSI includes a twiddle factor, beam indication information, a strongest beam indication for layer one, a wideband amplitude coefficient for layer one, a strongest beam indication for layer two, a wideband amplitude coefficient for layer two, a subband phase and or subband amplitude coefficient for an even subband, and a subband phase and or subband amplitude coefficient for an odd subband. As shown in table 2:
Table 2: first partial structure of CSI determined by codebook structure of Rel-15
According to the uplink channel resources allocated by the base station and the predefined code rate requirement of the system, the terminal equipment can discard the subband amplitude/phase of the odd subbands, the subband amplitude/phase of the even subbands and the rest of the second partial CSI information in sequence according to the priority, until the code rate requirement is met.
That is, in the embodiment of the present invention, if the terminal device determines that the codebook structure of Rel-15 needs to be used to determine the second CSI, since the codebook structure of Rel-15 has a larger overhead than the codebook structure of Rel-16, a feedback rule corresponding to the codebook structure of Rel-15 needs to be used, that is, the subband amplitude/phase of the odd subbands in the second portion of CSI, the subband amplitude/phase of the even subbands, and the remaining second portion of CSI information are sequentially discarded, so as to obtain the second CSI, where the second CSI overhead satisfies the feedback overhead of the base station configuration.
In the detailed description, the method flow of determining the second CSI by the terminal device according to the codebook parameter information configured by the base station and determining the second CSI by the terminal device according to the preset rule is described, and the second CSI may also be determined by a combination of the two, which specifically includes, as shown in fig. 4:
Step 401, a terminal device obtains an uplink channel resource indication allocated by a base station and codebook parameter information configured by the base station;
step 402, if the terminal device determines that the resource overhead of the first CSI required to be fed back to the base station is greater than the resource overhead corresponding to the uplink channel resource indication, the terminal device determines a second CSI according to codebook parameter information configured by the base station and a preset rule, and feeds back the second CSI to the base station; and the resource cost of the second CSI is smaller than or equal to the resource cost corresponding to the uplink channel resource indication.
For example, if the terminal device determines ri=2; and the codebook parameter information is that the sum of the numbers of the base vectors used by all layers of the precoding matrix is 7, M0 and M1 are adjusted to enable M0+M1=7, new CSI is calculated, and a subband CQI part in the new CSI is discarded to obtain second CSI.
The other methods of combination are also various and will not be described in detail herein.
Based on the above, the present invention further provides a feedback device for channel state information CSI, as shown in fig. 5, including:
a first obtaining unit 501, configured to obtain an uplink channel resource indication allocated by a base station and codebook parameter information configured by the base station;
A first CSI feedback unit 502, configured to determine a second CSI according to codebook parameter information configured by the base station and feed back the second CSI to the base station if it is determined that the resource overhead of the first CSI that needs to be fed back to the base station is greater than the resource overhead corresponding to the uplink channel resource indication; and the resource cost of the second CSI is smaller than or equal to the resource cost corresponding to the uplink channel resource indication.
Further, the first obtaining unit 501 is further configured to:
determining the first CSI according to a first precoding matrix;
the first CSI feedback unit 502 is specifically configured to:
determining a second precoding matrix according to the codebook parameter information and the first precoding matrix;
and determining second CSI according to the second precoding matrix.
Further, the first obtaining unit 501 is further configured to:
acquiring an expansion factor corresponding to the codebook parameter information;
the first CSI feedback unit 502 is specifically configured to:
and determining a second precoding matrix according to the codebook parameter information, the first precoding matrix and the spreading factor.
Further, the first CSI feedback unit 502 is specifically configured to:
adjusting precoding matrix information corresponding to the codebook parameter information in the first precoding matrix according to the codebook parameter information to obtain the second precoding matrix; and precoding matrix information corresponding to the codebook parameter information in the second precoding matrix is smaller than or equal to the codebook parameter information.
Further, the first CSI feedback unit 502 is specifically configured to:
and adjusting precoding matrix information corresponding to the codebook parameter information in the first precoding matrix according to the spreading factor and the codebook parameter information corresponding to the spreading factor to obtain the second precoding matrix.
Further, the codebook parameter information at least includes any one or a combination of the following information:
the sum of the number of basis vectors used by all layers of the precoding matrix;
the sum of the number of different synthesized beams used by all layers of the precoding matrix;
the maximum number of basis vectors used by each layer of the precoding matrix;
the maximum number of synthesized beams used by each layer of the precoding matrix;
the sum of the product of the number of coefficients of all layers of the precoding matrix.
Based on the same principle, embodiments of the present invention provide a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, cause the computer to perform the feedback method of any of the above-mentioned channel state information CSI. Based on the same technical concept, the embodiment of the present application provides an electronic device, as shown in fig. 6, including at least one processor 601 and a memory 602 connected to the at least one processor, where a specific connection medium between the processor 601 and the memory 602 is not limited in the embodiment of the present application, and in fig. 6, the processor 601 and the memory 602 are connected by a bus as an example. The buses may be divided into address buses, data buses, control buses, etc.
In the embodiment of the present application, the memory 602 stores instructions executable by the at least one processor 601, and the at least one processor 601 may perform the steps included in the foregoing feedback method of the channel state information CSI by executing the instructions stored in the memory 602.
The processor 601 is a control center of the electronic device, and may use various interfaces and lines to connect various parts of the electronic device, and determine a feedback method of the channel state information CSI by executing or executing instructions stored in the memory 602 and invoking data stored in the memory 602. Alternatively, the processor 601 may include one or more processing units, and the processor 601 may integrate an application processor and a modem processor, wherein the application processor primarily processes operating systems, user interfaces, application programs, and the like, and the modem processor primarily processes wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 601. In some embodiments, processor 601 and memory 602 may be implemented on the same chip, or they may be implemented separately on separate chips in some embodiments.
The processor 601 may be a general purpose processor such as a Central Processing Unit (CPU), digital signal processor, application specific integrated circuit (Application Specific Integrated Circuit, ASIC), field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, that can implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present application. The general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in a hardware processor for execution, or in a combination of hardware and software modules in the processor for execution.
The memory 602 is a non-volatile computer readable storage medium that can be used to store non-volatile software programs, non-volatile computer executable programs, and modules. The Memory 602 may include at least one type of storage medium, which may include, for example, flash Memory, hard disk, multimedia card, card Memory, random access Memory (Random Access Memory, RAM), static random access Memory (Static Random Access Memory, SRAM), programmable Read-Only Memory (Programmable Read Only Memory, PROM), read-Only Memory (ROM), charged erasable programmable Read-Only Memory (Electrically Erasable Programmable Read-Only Memory), magnetic Memory, magnetic disk, optical disk, and the like. Memory 602 is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. The memory 602 in the present embodiment may also be circuitry or any other device capable of implementing a memory function for storing program instructions and/or data.
Based on the same principle, the embodiment of the present invention further provides a feedback device for channel state information CSI, as shown in fig. 7, including:
A second obtaining unit 701, configured to obtain an uplink channel resource indication allocated by the base station;
a second CSI feedback unit 702, configured to determine a second CSI according to a preset rule if it is determined that the resource overhead of the first CSI that needs to be fed back to the base station is greater than the resource overhead corresponding to the uplink channel resource indication, and feed back the second CSI to the base station; and the resource cost of the second CSI is smaller than or equal to the resource cost corresponding to the uplink channel resource indication.
Further, the second CSI feedback unit 702 is specifically configured to:
determining the second CSI according to the first N feedback layers of the M feedback layers corresponding to the first CSI, wherein N is greater than or equal to 1, and M is greater than N; or alternatively
And discarding the sub-band CQI in the first CSI to obtain the second CSI.
Further, the second CSI feedback unit 702 is specifically configured to:
determining the first CSI according to the first codebook;
determining a third CSI according to the second codebook;
and discarding the part matched with the feedback rule in the third CSI according to the feedback rule of the second codebook to obtain the second CSI, wherein the cost of the second codebook is larger than that of the first codebook.
Based on the same principle, embodiments of the present invention provide a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, cause the computer to perform the feedback method of any of the above-mentioned channel state information CSI. Based on the same technical concept, the embodiment of the present application provides an electronic device, as shown in fig. 8, including at least one processor 801 and a memory 802 connected to the at least one processor, where a specific connection medium between the processor 801 and the memory 802 is not limited in the embodiment of the present application, and in fig. 8, the processor 801 and the memory 802 are connected by a bus, for example. The buses may be divided into address buses, data buses, control buses, etc.
In the embodiment of the present application, the memory 802 stores instructions executable by the at least one processor 801, and the at least one processor 801 may perform the steps included in the foregoing feedback method of the channel state information CSI by executing the instructions stored in the memory 802.
The processor 801 is a control center of the electronic device, and may determine a feedback method of channel state information CSI by executing or executing instructions stored in the memory 802 and invoking data stored in the memory 802 by using various interfaces and lines to connect various parts of the electronic device. Alternatively, the processor 801 may include one or more processing units, and the processor 801 may integrate an application processor that primarily processes operating systems, user interfaces, application programs, and the like, with a modem processor that primarily processes wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 801. In some embodiments, processor 801 and memory 802 may be implemented on the same chip, or they may be implemented separately on separate chips in some embodiments.
The processor 801 may be a general purpose processor such as a Central Processing Unit (CPU), digital signal processor, application specific integrated circuit (Application Specific Integrated Circuit, ASIC), field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, and may implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present application. The general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in a hardware processor for execution, or in a combination of hardware and software modules in the processor for execution.
Memory 802, as a non-volatile computer-readable storage medium, may be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. The Memory 802 may include at least one type of storage medium, which may include, for example, flash Memory, hard disk, multimedia card, card Memory, random access Memory (Random Access Memory, RAM), static random access Memory (Static Random Access Memory, SRAM), programmable Read-Only Memory (Programmable Read Only Memory, PROM), read-Only Memory (ROM), charged erasable programmable Read-Only Memory (Electrically Erasable Programmable Read-Only Memory), magnetic Memory, magnetic disk, optical disk, and the like. Memory 802 is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. The memory 802 in the embodiments of the present application may also be circuitry or any other device capable of implementing a memory function for storing program instructions and/or data.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (14)

1. A method for feeding back channel state information CSI, the method comprising:
the terminal equipment acquires an uplink channel resource indication allocated by a base station and codebook parameter information configured by the base station;
if the terminal equipment determines that the resource cost of the first CSI needing to be fed back to the base station is larger than the resource cost corresponding to the uplink channel resource indication, the terminal equipment determines a second CSI according to codebook parameter information configured by the base station and feeds back the second CSI to the base station; and the resource cost of the second CSI is smaller than or equal to the resource cost corresponding to the uplink channel resource indication.
2. The method according to claim 1, wherein the method further comprises:
the terminal equipment determines the first CSI according to a first precoding matrix;
the terminal equipment determines a second CSI according to codebook parameter information configured by the base station, and the method comprises the following steps:
The terminal equipment determines a second precoding matrix according to the codebook parameter information and the first precoding matrix;
and the terminal equipment determines second CSI according to the second precoding matrix.
3. The method according to claim 2, wherein the method further comprises:
the terminal equipment acquires the expansion factor corresponding to the codebook parameter information;
the terminal equipment determines a second precoding matrix according to the codebook parameter information and the first precoding matrix, and the method comprises the following steps:
and the terminal equipment determines a second precoding matrix according to the codebook parameter information, the first precoding matrix and the spreading factor.
4. The method of claim 2, wherein the determining, by the terminal device, a second precoding matrix from the codebook parameter information and the first precoding matrix comprises:
the terminal equipment adjusts precoding matrix information corresponding to the codebook parameter information in the first precoding matrix according to the codebook parameter information to obtain the second precoding matrix; and precoding matrix information corresponding to the codebook parameter information in the second precoding matrix is smaller than or equal to the codebook parameter information.
5. The method of claim 3, wherein the terminal device determining a second precoding matrix from the codebook parameter information, the first precoding matrix, and the spreading factor comprises:
and the terminal equipment adjusts precoding matrix information corresponding to the codebook parameter information in the first precoding matrix according to the spreading factor and the codebook parameter information corresponding to the spreading factor to obtain the second precoding matrix.
6. The method according to any one of claims 1 to 5, wherein the codebook parameter information at least includes any one or a combination of the following information:
the sum of the number of basis vectors used by all layers of the precoding matrix;
the sum of the number of different synthesized beams used by all layers of the precoding matrix;
the maximum number of basis vectors used by each layer of the precoding matrix;
the maximum number of synthesized beams used by each layer of the precoding matrix;
the sum of the product of the number of coefficients of all layers of the precoding matrix.
7. A method for feeding back channel state information CSI, the method comprising:
the terminal equipment acquires an uplink channel resource indication allocated by the base station;
If the terminal equipment determines that the resource cost of the first CSI needing to be fed back to the base station is larger than the resource cost corresponding to the uplink channel resource indication, the terminal equipment determines a second CSI according to a preset rule and feeds back the second CSI to the base station; the resource cost of the second CSI is smaller than or equal to the resource cost corresponding to the uplink channel resource indication;
the method further comprises the steps of:
the terminal equipment determines the first CSI according to a first codebook;
the terminal equipment determines a second CSI according to a preset rule, and the method comprises the following steps:
the terminal equipment determines a third CSI according to the second codebook;
and the terminal equipment discards the part matched with the feedback rule in the third CSI according to the feedback rule of the second codebook to obtain the second CSI, wherein the cost of the second codebook is larger than that of the first codebook.
8. The method of claim 7, wherein the determining, by the terminal device, the second CSI according to the preset rule comprises:
the terminal equipment determines the second CSI according to the first N feedback layers of M feedback layers corresponding to the first CSI, wherein N is greater than or equal to 1, and M is greater than N; or alternatively
And the terminal equipment discards the sub-band CQI in the first CSI to obtain the second CSI.
9. A feedback apparatus for channel state information CSI, comprising:
a first obtaining unit, configured to obtain an uplink channel resource indication allocated by a base station and codebook parameter information configured by the base station;
the first CSI feedback unit is used for determining a second CSI according to codebook parameter information configured by the base station and feeding back the second CSI to the base station if the resource cost of the first CSI required to be fed back to the base station is larger than the resource cost corresponding to the uplink channel resource indication; and the resource cost of the second CSI is smaller than or equal to the resource cost corresponding to the uplink channel resource indication.
10. A feedback apparatus for channel state information CSI, comprising:
a second obtaining unit, configured to obtain an uplink channel resource indication allocated by the base station;
the second CSI feedback unit is used for determining a second CSI according to a preset rule and feeding back the second CSI to the base station if the resource cost of the first CSI which needs to be fed back to the base station is larger than the resource cost corresponding to the uplink channel resource indication; the resource cost of the second CSI is smaller than or equal to the resource cost corresponding to the uplink channel resource indication;
The second CSI feedback unit is specifically configured to:
determining the first CSI according to a first codebook;
determining a third CSI according to the second codebook;
and discarding the part matched with the feedback rule in the third CSI according to the feedback rule of the second codebook to obtain the second CSI, wherein the cost of the second codebook is larger than that of the first codebook.
11. An electronic device, comprising:
at least one processor; the method comprises the steps of,
a memory communicatively coupled to the at least one processor; wherein, the liquid crystal display device comprises a liquid crystal display device,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-6.
12. A non-transitory computer readable storage medium storing computer instructions for causing a computer to perform the method of any one of claims 1-6.
13. An electronic device, comprising:
at least one processor; the method comprises the steps of,
a memory communicatively coupled to the at least one processor; wherein, the liquid crystal display device comprises a liquid crystal display device,
The memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 7-8.
14. A non-transitory computer readable storage medium storing computer instructions for causing a computer to perform the method of any one of claims 7-8.
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