CN111435886A - Feedback method and device of Channel State Information (CSI) - Google Patents

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

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Publication number
CN111435886A
CN111435886A CN201910028408.2A CN201910028408A CN111435886A CN 111435886 A CN111435886 A CN 111435886A CN 201910028408 A CN201910028408 A CN 201910028408A CN 111435886 A CN111435886 A CN 111435886A
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csi
precoding matrix
base station
parameter information
codebook
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CN111435886B (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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Telecommunications Science and Technology Research Institute 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

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

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

Description

Feedback method and device of 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 development direction of modern communication technology, and 5G, a fifth generation mobile phone mobile communication standard, also called a fifth generation mobile communication technology, is also an extension after 4G. As a main direction of development of new-generation information communication, 5G will permeate into various fields of future society, and construct an all-around information ecosystem centering on users.
In the 3GPP Rel-155G new air interface (NR) standard, according to the uplink channel resources allocated by the base station and the predefined code rate requirement of the system, the terminal may discard the subband amplitude/phase of the odd subband, the subband amplitude/phase of the even subband and the remaining CSI information of the second part of CSI in sequence according to the priority until the code rate requirement is satisfied. 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 coefficient of each sub-band is compressed, and the compressed coefficient is fed back to the base station.
However, since the coefficients of the codebook are all full-bandwidth and have no subband coefficient, the CSI reporting method of Rel-15, which discards the codebook coefficients according to half of subbands, cannot be used. At present, no CSI reporting scheme aiming at the Rel-16 codebook structure exists.
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 no CSI reporting scheme aiming at a Rel-16 codebook structure exists in the prior art.
In one aspect, the present invention provides a method for feeding back channel state information CSI, including:
terminal equipment acquires uplink channel resource indication distributed by a base station and codebook parameter information configured by the base station;
if the terminal equipment determines that the resource overhead of the first CSI needing to be fed back to the base station is larger than the resource overhead 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 the second CSI back to 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.
Further, the method further comprises:
the terminal equipment determines the first CSI according to a first precoding matrix;
the determining, by the terminal device, the second CSI according to the codebook parameter information configured by the base station includes:
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 an expansion factor corresponding to the codebook parameter information;
the terminal device 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 a second precoding matrix; and precoding matrix information corresponding to the codebook parameter information in the second precoding matrix is less 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;
sum of coefficient number products 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, the second CSI is determined through the second precoding matrix, the cost of the precoding matrix is reduced due to the adjustment of the matrix information in the first precoding matrix, and the generated cost of the second CSI is less than that of the first CSI and accords with the uplink channel resource indication configured by the base station.
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 distributed by a base station;
if the terminal equipment determines that the resource overhead of the first CSI needing to be fed back to the base station is larger than the resource overhead corresponding to the uplink channel resource indication, the terminal equipment determines a second CSI according to a preset rule and feeds the second CSI back to 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.
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 the M feedback layers corresponding to the first CSI, wherein N is larger than or equal to 1, and M is larger than N; or
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 a 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 greater than that of the first codebook.
In the embodiment of the invention, when the terminal determines that the cost of the CSI fed back to the base station at present is larger than the reporting cost configured by the base station, 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 configured by the base station.
In one aspect, an embodiment of the present invention further provides a device for feeding back CSI, where the device includes:
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 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 determined to be larger than the resource cost corresponding to the uplink channel resource indication; and the resource overhead of the second CSI is less than or equal to the resource overhead corresponding to the uplink channel resource indication.
Further, the first obtaining 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 obtaining 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 a second precoding matrix; and precoding matrix information corresponding to the codebook parameter information in the second precoding matrix is less 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;
sum of coefficient number products of all layers of the precoding matrix.
An embodiment of the present invention further provides an electronic device, including:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to cause the at least one processor to perform any of the methods described above.
Embodiments of the present invention also provide a non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform any one of the methods described above.
In one aspect, an embodiment of the present invention further provides a device for feeding back CSI, where the device includes:
a second obtaining unit, configured to obtain an uplink channel resource indication allocated by a base station;
the second CSI feedback unit is used for determining second CSI according to a preset rule and feeding the second CSI back to the base station if the resource cost of the first CSI required to be fed back to the base station is determined to be larger than the resource cost corresponding to the uplink channel resource indication; and the resource overhead of the second CSI is less than or equal to the resource overhead 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
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 third CSI according to the second codebook;
and discarding a part of the third CSI matched with the feedback rule according to the feedback rule of the second codebook to obtain the second CSI, wherein the overhead of the second codebook is greater than that of the first codebook.
An embodiment of the present invention further provides an electronic device, including:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to cause the at least one processor to perform any of the methods described above.
Embodiments of the present invention also provide a non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform any one of the methods described above.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a communication architecture according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of a method for feeding back CSI according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of a method for feeding back CSI according to an embodiment of the present invention;
fig. 4 is a schematic flowchart of a method for feeding back CSI according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a feedback apparatus for 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 apparatus for 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 clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic diagram of an architecture of a communication system according to an embodiment of the present invention, where the communication system includes a network-side device 101 and a terminal device 102, where the terminal device 102 and the network-side device 101 communicate with each other through some air interface technologies, where the air interface technologies may include 2G (e.g., gsm), 3G ((UMTS, WCDMA), TD-SCDMA)), 4G (e.g., FDD L TE, TDD L TE), and New RAT systems, such as 5G system.
The terminal device 102 described in the embodiments of the present invention will be described in the general context of a UE, and the terminal device 102 may also be referred to as a mobile station, an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a user device, a Wireless communication device, a user agent, a user equipment, or the like, the user device may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless local loop (Wireless L ocs L oop, W LL) station, a Personal Digital Assistant (PDA), a handheld device having a Wireless communication function, a computing device, or other processing device connected to a Wireless modem, a vehicle-mounted device, a wearable device, and a mobile station in a 5G Network or a user device in a future-evolution Public land mobile Network (P2 MN) Network, and the like, and the terminal device 102 may also include a Relay station (Relay station 101) capable of performing communication.
In the embodiment of the present invention, the base stations hereinafter refer to the network side device 101, and details are not described hereinafter.
In NR Rel-15, a TypeII codebook is defined. It supports Rank1 and Rank2 codebooks based on a way to linearly combine beams within orthogonal beam groups. For one subband, the Rank1 codebook is expressed as:
Figure BDA0001943340730000081
the Rank2 codebook is expressed as:
Figure BDA0001943340730000091
wherein
Figure BDA0001943340730000092
L denotes the number of orthogonal beams within a group,
Figure BDA0001943340730000093
orthogonal beams are represented, which use 2D DFT vectors, r is 0,1 represents the first and second polarization directions in a dual-polarized antenna array, l is 0, and 1 represents a layer.
Figure BDA0001943340730000094
Representing wideband amplitude quantization factors acting on a beam i, a polarization direction r and a layer l in a beam group;
Figure BDA0001943340730000095
representing the subband amplitude quantization factors acting on the beam i, the polarization direction r and the layer l in the beam group; c. Cr,l,iRepresenting 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, and the low-overhead Type II codebook compresses the coefficient of each sub-band and feeds the compressed coefficient back to the base station. For a Type II codebook with Rank2, for all subbands, layer-one precoding is represented as:
Figure BDA0001943340730000096
layer two precoding is represented as:
Figure BDA0001943340730000097
wherein, W1The orthogonal combined beam contained in the code division multiplexing signal is the same as a Type II codebook of Rel-15;
Figure BDA0001943340730000098
and
Figure BDA0001943340730000099
representing the compressed coefficients of layer one and layer two, respectively
Figure BDA00019433407300000910
And
Figure BDA00019433407300000911
the coefficient of the amplitude is represented by,
Figure BDA00019433407300000912
and
Figure BDA00019433407300000913
representing phase coefficients, wherein the coefficient of each layer needs to be fed back to a base station; wf,0And Wf,1Representing a matrix of compressed basis vectors, each matrix containing M basis vectors, each vector having a length N, N being determined by the number of subbands.
Based on the above, an embodiment of the present invention provides a method for feeding back 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 overhead of the second CSI is less than or equal to the resource overhead corresponding to the uplink channel resource indication.
In step 201, the terminal device receives an uplink channel resource indication sent by the base station for 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 terminal device needs to adjust the feedback mechanism of the CSI, so that the adjusted CSI is matched with the resource overhead corresponding to the uplink channel resource indication.
In the embodiment of the invention, the terminal equipment determines the 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 this 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 at least includes rank RI, wideband CQI, subband CQI, and PMI.
In the embodiment of the invention, because the resource overhead of the first CSI is greater than the resource overhead corresponding to the uplink channel resource indication, part of matrix information in the first precoding matrix can be adjusted through codebook parameter information configured by the base station, so that the CSI feedback overhead is reduced.
Specifically, in the embodiment of the present invention, the terminal device determines the second precoding matrix according to the codebook parameter information and the first precoding matrix; and the terminal determines the second CSI according to the second precoding matrix.
Optionally, in the embodiment of the present invention, the first precoding matrix may be further adjusted by setting an extension factor corresponding to codebook parameter information, part of matrix information in the first precoding matrix may be adjusted to match the codebook parameter information by using the extension factor, the adjusted first precoding matrix is used as a second precoding matrix, and the second CSI is determined according to the second precoding matrix.
Optionally, in the embodiment of the present invention, if there are multiple codebook parameter information, there may be multiple spreading factors, that is, each codebook parameter information corresponds to one spreading factor; or the codebook parameter information is multiple, the number of the spreading factors is smaller than that of the codebook parameter information, and the spreading factors correspond to the 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 configuration, or configured by the base station and sent to the terminal device.
Optionally, in this embodiment of the present invention, 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;
sum of coefficient number products 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 synthetic beams used by each layer and the number of the base vectors of the layer.
For example, in the embodiment of the present invention, the codebook parameter information is the sum of the numbers of basis vectors used by all layers of the precoding matrix, and the total sum of the numbers of basis vectors may be made not to exceed the sum of the numbers of basis vectors configured by the base station by adjusting the basis vectors 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 basis vectors used by each layer of the precoding matrix, and the sum of the total number of basis vectors may not exceed the maximum number of basis vectors used by each layer by adjusting the maximum number of basis vectors used by each layer in the first precoding matrix.
In order to better explain the process of determining the second precoding matrix through codebook parameter information provided by the embodiment of the present invention, an example is given here.
If the terminal equipment determines that RI is 2; for the Type II codebook with Rank2, the layer-one precoding is expressed as:
Figure BDA0001943340730000121
layer two precoding is represented as:
Figure BDA0001943340730000122
in equations 5 and 6, W1Comprising 2L beams, Wf,0Contains M0 basis vectors, Wf,1Each containing M1 basis vectors. When RI is 2, the number of the coefficients reported by the terminal is
Figure BDA0001943340730000123
That is, the first precoding matrix is shown in equations 5 and 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, the base vectors used by the adjustment layer and the base vectors used by the layer two, namely M0 and M1, are adjusted so that M0+ M1 is not more than the sum of the numbers of the base vectors used by all layers configured by the codebook parameter information.
Specifically, assuming that the sum of the numbers of basis vectors used by all layers of the codebook parameter information configuration is 7, M0 may be 3, and M1 may be 4; or M0 is 4, M1 is 3; or M0 is 2, M1 is 5; or M0 is 5, M1 is 2; or M0 is 3, M1 is 3; or M0 ═ 4, M1 ═ 2, and so on.
In the adjusted first precoding matrix, the value of L is unchanged, the values of M0 and M1 are changed, and a second precoding matrix is obtained, and the sum of the numbers of basis vectors used by all layers in the second precoding matrix is less than or equal to the sum of the numbers of basis 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 present invention, the codebook parameter information is the sum of the coefficient number products of all layers of the precoding matrix, that is, the configuration
Figure BDA0001943340730000131
Is taken from a value of, or
Figure BDA0001943340730000132
The value of (2) is to adjust the coefficient number product of each layer in the first precoding matrix so that the sum of the coefficient number products of all layers of the second precoding matrix is less 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 L values used by different layers are different, the terminal device may determine the value of L used by each layer and the value of M used by each layer, and the total coefficient overhead does not exceed the uplink channel resources.
Or in the embodiment of the present 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) Is less than or equal to 3, i is 0 and 1. At this time, the base station may allocate uplink channel resources according to the per-layer Mi being 3, that is, M0 being 3, and M1 being 3, 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 example is illustrated here.
If the terminal equipment determines that RI is 2; for the Type II codebook with Rank2, the layer-one precoding is expressed as:
Figure BDA0001943340730000133
layer two precoding is represented as:
Figure BDA0001943340730000141
in formula 7 and formula 8, W1Comprising 2L beams, Wf,0Contains M0 basis vectors, Wf,1Each containing M1 basis vectors. When RI is 2, the number of the coefficients reported by the terminal equipment is
Figure BDA0001943340730000142
That is, the first precoding matrix is shown in equation 7 and equation 8.
The extension factor obtained by the terminal device is R, the extension factor corresponds to codebook parameter information, which is the sum of the numbers of basis vectors used by all layers of the precoding matrix, that is, the second precoding matrix is determined by the extension factor R and matrix information corresponding to the codebook parameter information in the first precoding matrix, that is, the number of basis vectors used by each layer in the first precoding matrix is adjusted by the extension factor R.
In the embodiment of the present invention, for example, when R is 2, M0 in the first precoding matrix is 4, M2 is 6, and the sum of the numbers of basis vectors used by all layers of the precoding matrix configured by the base station is 7, M0/R is 2 basis vectors are used as the basis vectors used by layer one, M1/R is 3 basis vectors are used as the basis vectors used by layer two, and a second precoding matrix is obtained, and the sum of the numbers of basis vectors used by all layers in the second precoding matrix is 5, which satisfies the requirement of the sum of the numbers of basis vectors used by all layers of the precoding matrix configured by the base station.
Naturally, optionally, in the embodiment of the present invention, the sum of the numbers of synthesized beams in the first precoding matrix may also be adjusted by setting a spreading factor corresponding to the sum of the numbers of different synthesized beams used by all layers of the precoding matrix, for example, when R is 2, L is 6, and the sum of the numbers of different synthesized beams used by all layers configured by the base station is 4, L1/R may be L/R is 3 as the sum of the numbers of different synthesized beams used by all layers of the precoding matrix, so as to obtain the second precoding matrix, and the sum of the numbers of different synthesized beams used by all layers of the precoding matrix in the second precoding matrix meets the configuration requirement of the base station.
The principle flow of the spreading factor scheme for other codebook parameter information, for example, 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, or the sum of the product of the numbers of coefficients of all layers of the precoding matrix, is similar to the flow in the above embodiment, and is not described herein again.
In this embodiment of the present invention, the terminal device may further determine the second CSI according to a preset rule, specifically as shown in fig. 3, where the method includes:
301, terminal equipment obtains uplink channel resource indication allocated by a base station;
step 302, 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 a preset rule and feeds the second CSI back to 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.
That is to say, in the embodiment of the present invention, by setting a preset rule, after the terminal device determines that the overhead of the first CSI is greater than the resource overhead configured by the base station, the second CSI is generated according to the preset rule, and 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 the M feedback layers corresponding to the first CSI, wherein N is larger than or equal to 1, and M is larger than N; or
And the terminal equipment discards the sub-band CQI in the first CSI to obtain the second CSI.
That is to say, in the embodiment of the present invention, if the RI determined by the terminal device has more than or equal to 2 layers, and when the CSI reported by the terminal device includes precoding matrix information of all layers, the first N feedback layers are determined as 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, and M is a value of RI.
For example, if the terminal device determines that RI is 2, and the feedback overhead of the first CSI determined according to RI being 2 is greater than the feedback overhead configured by the base station, the precoding matrix information of layer two is discarded, and the second CSI is determined according to the discarded new precoding matrix.
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 amount of information of the precoding matrix, and thus the overhead of the generated CSI is also reduced.
Or, in the embodiment of the present invention, the first CSI at least includes rank RI, wideband CQI, subband CQI, and PMI, and the subband CQI in the first CSI may be discarded to obtain the second CSI, and since the subband CQI in the second CSI is partially discarded, the data amount is reduced, and therefore, CSI feedback overhead configured by the base station is satisfied.
In the embodiment of the present invention, in addition to the preset rule, the second CSI may be determined by using another normative codebook, and since the feedback method of the CSI has been determined for the schemes of the other normative codebooks in the prior art, in the embodiment of the present invention, the CSI may be fed back by using another normative codebook and then according to the feedback method of the CSI corresponding to the other normative codebook, 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 greater than that of the first codebook.
In order to better explain the process of determining the second precoding matrix through other normative codebooks, which is provided by the embodiment of the present invention, the description is given here.
In the embodiment of the invention, when the cost of the first CSI determined by using the Rel-16 low-cost Type II codebook exceeds the uplink channel resource allocated by the base station, the terminal equipment adopts the Rel-15 Type II codebook structure to calculate the precoding.
In Rel-15, the following two-part structure is adopted for reporting CSI corresponding to a Type II codebook:
the first part of the CSI comprises RI, wideband CQI corresponding to the first codeword, differential CQI corresponding to the first codeword, the number of zero coefficients of the layer one and the number of zero coefficients of the layer two. As shown in table 1:
table 1: first partial structure of CSI determined by codebook structure of Rel-15
Figure BDA0001943340730000171
The second part of the CSI comprises twiddle factors, beam indication information, the strongest beam indication of layer one, the wideband amplitude coefficient of layer one, the strongest beam indication of layer two, the wideband amplitude coefficient of layer two, the subband phase and or subband amplitude coefficients of even subbands, and the subband phase and or subband amplitude coefficients of odd subbands. As shown in table 2:
table 2: first partial structure of CSI determined by codebook structure of Rel-15
Figure BDA0001943340730000172
According to the uplink channel resources allocated by the base station and the predefined code rate requirement of the system, the terminal device can discard the subband amplitude/phase of the odd subband, the subband amplitude/phase of the even subband and the rest second part of CSI information in the second part of CSI in sequence according to the priority until the code rate requirement is met.
That is to say, in the embodiment of the present invention, if the terminal device determines that the second CSI needs to be determined by using the codebook structure of Rel-15, since the overhead of the codebook structure of Rel-15 is greater than the overhead of 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 subband, the subband amplitude/phase of the even subband and the remaining second CSI information in the second part of CSI are discarded in sequence, so as to obtain the second CSI, where the second CSI overhead satisfies the feedback overhead configured by the base station.
Specifically, as shown in fig. 4, the method flow for determining the second CSI by the terminal device according to the codebook parameter information configured by the base station and the method flow for determining the second CSI by the terminal device according to the preset rule may also be used to determine the second CSI in a manner of combining the two methods, and includes:
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 the second CSI back to 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.
Exemplarily, if the terminal device determines that RI is 2; and codebook parameter information is that the sum of the number of basis vectors used by all layers of the precoding matrix is 7, M0 and M1 are adjusted to make M0+ M1 equal to 7, new CSI is calculated, the sub-band CQI part in the new CSI is discarded, and second CSI is obtained.
There are various other combining methods, which are not described herein.
Based on the above, the present invention further provides a feedback apparatus for 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, 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, a second CSI according to codebook parameter information configured by the base station, and feed back the second CSI to 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.
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 a second precoding matrix; and precoding matrix information corresponding to the codebook parameter information in the second precoding matrix is less 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;
sum of coefficient number products of all layers of the precoding matrix.
Based on the same principle, an embodiment of the present invention provides a computer program product including a computer program stored on a non-transitory computer-readable storage medium, the computer program including program instructions that, when executed by a computer, cause the computer to perform any one of the above-described methods for feedback of 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 a bus connection between the processor 601 and the memory 602 in fig. 6 is taken as an example. The bus may be divided into an address bus, a data bus, a control bus, 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 execute the steps included in the 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 connect various parts of the electronic device by using various interfaces and lines, and determine a feedback method of the channel state information CSI by executing or executing instructions stored in the memory 602 and calling data stored in the memory 602. Optionally, 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 mainly handles an operating system, a user interface, an application program, and the like, and the modem processor mainly handles wireless communication. It will be appreciated that the modem processor described above may not be integrated into the processor 601. In some embodiments, the processor 601 and the memory 602 may be implemented on the same chip, or in some embodiments, they may be implemented separately on separate chips.
The processor 601 may be a general-purpose processor, such as a Central Processing Unit (CPU), a digital signal processor, an Application Specific Integrated Circuit (ASIC), a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, configured to implement or perform the methods, steps, and logic blocks disclosed in the embodiments of the present Application. A 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 directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in a processor.
The memory 602, which is 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 602 may include at least one type of storage medium, and may include, for example, a flash Memory, a hard disk, a multimedia card, a card-type Memory, a Random Access Memory (RAM), a Static Random Access Memory (SRAM), a Programmable Read Only Memory (PROM), a Read Only Memory (ROM), a charge Erasable Programmable Read Only Memory (EEPROM), a magnetic Memory, a magnetic disk, an optical disk, and so on. The 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 embodiments of the present application may also be circuitry or any other device capable of performing a storage function for storing program instructions and/or data.
Based on the same principle, an embodiment of the present invention further provides a feedback apparatus for CSI, as shown in fig. 7, including:
a second obtaining unit 701, configured to obtain an uplink channel resource indication allocated by a base station;
a second CSI feedback unit 702, configured to determine, 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 indicator, a second CSI according to a preset rule, and feed back the second CSI to 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.
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
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 third CSI according to the second codebook;
and discarding a part of the third CSI matched with the feedback rule according to the feedback rule of the second codebook to obtain the second CSI, wherein the overhead of the second codebook is greater than that of the first codebook.
Based on the same principle, an embodiment of the present invention provides a computer program product including a computer program stored on a non-transitory computer-readable storage medium, the computer program including program instructions that, when executed by a computer, cause the computer to perform any one of the above-described methods for feedback of 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 the processor 801 and the memory 802 are connected through a bus in fig. 8 as an example. The bus may be divided into an address bus, a data bus, a control bus, 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 execute the steps included in the 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 connect various parts of the electronic device by using various interfaces and lines, and determine a feedback method of the channel state information CSI by executing or executing instructions stored in the memory 802 and calling data stored in the memory 802. Optionally, the processor 801 may include one or more processing units, and the processor 801 may integrate an application processor and a modem processor, wherein the application processor mainly handles operating systems, user interfaces, application programs, and the like, and the modem processor mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 801. In some embodiments, the processor 801 and the memory 802 may be implemented on the same chip, or in some embodiments, they may be implemented separately on separate chips.
The processor 801 may be a general-purpose processor, such as a Central Processing Unit (CPU), a digital signal processor, an Application Specific Integrated Circuit (ASIC), a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, configured to implement or perform the methods, steps, and logic blocks disclosed in the embodiments of the present Application. A 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 directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in a processor.
Memory 802, which is 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, and may include, for example, a flash Memory, a hard disk, a multimedia card, a card-type Memory, a Random Access Memory (RAM), a Static Random Access Memory (SRAM), a Programmable Read Only Memory (PROM), a Read Only Memory (ROM), a charged Erasable Programmable Read Only Memory (EEPROM), a magnetic Memory, a magnetic disk, an optical disk, and so on. The 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 performing a storage 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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. Therefore, it is intended that the appended claims be interpreted as including 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 changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (15)

1. A method for feeding back Channel State Information (CSI), the method comprising:
terminal equipment acquires uplink channel resource indication distributed by a base station and codebook parameter information configured by the base station;
if the terminal equipment determines that the resource overhead of the first CSI needing to be fed back to the base station is larger than the resource overhead 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 the second CSI back to 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.
2. The method of claim 1, further comprising:
the terminal equipment determines the first CSI according to a first precoding matrix;
the determining, by the terminal device, the second CSI according to the codebook parameter information configured by the base station includes:
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.
3. The method of claim 2, further comprising:
the terminal equipment acquires an expansion factor corresponding to the codebook parameter information;
the terminal device 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 terminal device determines a second precoding matrix according to the codebook parameter information and the first precoding matrix, and 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 a second precoding matrix; and precoding matrix information corresponding to the codebook parameter information in the second precoding matrix is less than or equal to the codebook parameter information.
5. The method of claim 3, wherein the terminal device determines a second precoding matrix according to the codebook parameter information, the first precoding matrix and the spreading factor, and 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 comprises 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;
sum of coefficient number products 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 distributed by a base station;
if the terminal equipment determines that the resource overhead of the first CSI needing to be fed back to the base station is larger than the resource overhead corresponding to the uplink channel resource indication, the terminal equipment determines a second CSI according to a preset rule and feeds the second CSI back to 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.
8. The method of claim 1, wherein the determining, by the terminal device, the second CSI according to a preset rule comprises:
the terminal equipment determines the second CSI according to the first N feedback layers of the M feedback layers corresponding to the first CSI, wherein N is larger than or equal to 1, and M is larger than N; or
And the terminal equipment discards the sub-band CQI in the first CSI to obtain the second CSI.
9. The method of claim 1, further comprising:
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 a 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 greater than that of the first codebook.
10. A device for feeding back 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 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 determined to be larger than the resource cost corresponding to the uplink channel resource indication; and the resource overhead of the second CSI is less than or equal to the resource overhead corresponding to the uplink channel resource indication.
11. A device for feeding back channel state information CSI, comprising:
a second obtaining unit, configured to obtain an uplink channel resource indication allocated by a base station;
the second CSI feedback unit is used for determining second CSI according to a preset rule and feeding the second CSI back to the base station if the resource cost of the first CSI required to be fed back to the base station is determined to be larger than the resource cost corresponding to the uplink channel resource indication; and the resource overhead of the second CSI is less than or equal to the resource overhead corresponding to the uplink channel resource indication.
12. An electronic device, comprising:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
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.
13. 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.
14. An electronic device, comprising:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
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 7-9.
15. A non-transitory computer readable storage medium storing computer instructions for causing a computer to perform the method of any one of claims 7-9.
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