CN109586775B - Channel State Information (CSI) feedback method, terminal and base station - Google Patents

Channel State Information (CSI) feedback method, terminal and base station Download PDF

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CN109586775B
CN109586775B CN201710912465.8A CN201710912465A CN109586775B CN 109586775 B CN109586775 B CN 109586775B CN 201710912465 A CN201710912465 A CN 201710912465A CN 109586775 B CN109586775 B CN 109586775B
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subbands
csi
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pmi
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CN109586775A (en
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李辉
白文岭
高秋彬
拉盖施
陈润华
苏昕
黄秋萍
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China Academy of Telecommunications Technology CATT
Datang Mobile Communications Equipment Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • 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]

Abstract

The embodiment of the invention provides a Channel State Information (CSI) feedback method, a terminal and a base station, which are used for solving the technical problem that no effective solution is available for reporting a second part of CSI in the prior art. The method comprises the steps that the terminal determines S sub-bands from N sub-bands based on a first preset criterion; the first preset criterion is used for indicating the distribution of S sub-bands in N sub-bands, the N sub-bands are sub-bands of a Channel Quality Indicator (CQI) to be calculated, N is an integer greater than or equal to 1, and S is less than or equal to N; the terminal determines CSI to be fed back; the CSI to be fed back is divided into a first part CSI and a second part CSI, the first part CSI comprises CQI of each sub-band in N sub-bands, and the second part CSI comprises precoding matrix indication PMI of each sub-band in S sub-bands of the N sub-bands; and the terminal feeds back the CSI to be fed back to the base station.

Description

Channel State Information (CSI) feedback method, terminal and base station
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a channel state information CSI feedback method, a terminal, and a base station.
Background
In a New Radio, NR, Multiple-Input Multiple-Output (MIMO) system in a fifth Generation mobile communication technology (5-Generation, 5G), when a terminal reports Channel State Information (CSI) to a base station, the CSI is generally divided into two parts, namely a first part CSI and a second part CSI, for reporting.
In order to enable the terminal to report the CSI to the base station for scheduling by the base station, the base station needs to allocate uplink channel resources for the terminal to report the CSI. When the uplink channel resource allocation is insufficient, the terminal cannot report all the complete first part CSI and the complete second part CSI. In this case, the NR system specifies that the first CSI portion needs to be completely reported and the second CSI portion needs to be partially reported, that is, when the second CSI portion is partially reported, parameters of each subband in all subbands do not need to be reported, and a plurality of subbands may be selected from all subbands and reported.
Since a Channel Quality Indication (CQI) of each subband included in the first partial CSI is calculated based on the wideband parameter and the corresponding subband parameter in the second partial CSI. When the partial report of the second partial CSI is performed, parameters of a plurality of subbands are discarded, and at this time, a CQI of a corresponding subband in the first partial CSI cannot find a Precoding Matrix (PMI) parameter of the subband corresponding to the CQI. After receiving the CSI feedback, the base station cannot accurately use the CQIs of the subbands for scheduling, which affects the system performance.
In the prior art, no effective solution exists for how to report the second CSI.
Disclosure of Invention
The embodiment of the invention provides a Channel State Information (CSI) feedback method, a terminal and a base station, which are used for solving the technical problem that no effective solution is available for reporting a second part of CSI in the prior art.
In a first aspect, an embodiment of the present invention provides a method for feeding back CSI, including:
the terminal determines S sub-bands from the N sub-bands based on a first preset criterion; the first preset criterion is used for indicating the distribution of the S sub-bands in the N sub-bands, the N sub-bands are sub-bands of a Channel Quality Indicator (CQI) to be calculated, the N is an integer greater than or equal to 1, and the S is less than or equal to the N; the terminal determines CSI to be fed back; the CSI to be fed back is divided into a first partial CSI and a second partial CSI, the first partial CSI comprises a CQI of each sub-band in the N sub-bands, and the second partial CSI comprises a Precoding Matrix Indicator (PMI) of each sub-band in the S sub-bands in the N sub-bands; and the terminal feeds back the CSI to be fed back to the base station.
In a possible implementation manner, the value of S is determined by uplink channel resources allocated by the system.
In a possible implementation manner, the determining, by the terminal, S subbands from N subbands based on a first preset criterion includes:
the terminal uniformly selects the S sub-bands from the N sub-bands; or (c).
The terminal calculates PMI and CQI of each sub-band in the N sub-bands; and the terminal sorts the N sub-bands from large to small according to the CQI value and determines the first S sub-bands in the N sorted sub-bands.
In a possible implementation manner, the determining, by the terminal, CSI to be fed back includes:
the terminal determines first subband information, wherein the first subband information comprises PMI and CQI of each subband in the S subbands;
the terminal determines second sub-band information based on a second preset criterion and the first sub-band information; wherein the second subband information includes a CQI for each of remaining subbands of the N subbands other than the S subbands;
the terminal determines the CSI to be fed back, wherein the CSI to be fed back comprises the first subband information and the second subband information.
In a possible implementation manner, the determining, by the terminal, second subband information based on a second preset criterion and the first subband information includes:
when the terminal determines the CQI of each sub-band in the remaining sub-bands, the following operations are executed:
and the terminal determines the CQI of one of the residual sub-bands based on the PMIs of one or more sub-bands in the S sub-bands adjacent to the one of the residual sub-bands.
In a possible implementation, the first preset criterion and the second preset criterion are predefined by a system or signaled to the terminal by the base station.
In a second aspect, an embodiment of the present invention provides another method for feeding back CSI, where the method includes:
the base station receives CSI fed back by the terminal; the CSI is divided into a first partial CSI and a second partial CSI, the first partial CSI comprises CQI of each of N subbands, the second partial CSI comprises Precoding Matrix Indication (PMI) of each of S subbands of the N subbands, N is an integer greater than or equal to 1, and S is smaller than or equal to N;
the base station determines the PMI of each sub-band in the N-S sub-bands based on the CSI and a second preset criterion;
and the base station carries out resource scheduling based on the PMI and the CQI of each sub-band in the N sub-bands.
In one possible implementation manner, the determining, by the base station, the PMI of each of the N-S subbands based on the CSI and a second preset criterion includes:
the base station determines first subband information from the CSI based on a first preset criterion; wherein the first subband information includes a PMI and a CQI of each of the S subbands, and the first preset criterion is used to indicate distribution of the S subbands in the N subbands;
and the base station determines the PMI of each subband in the N-S subbands based on the first subband information and the second preset criterion.
In a possible implementation manner, the determining, by the base station, the PMI of each subband in the N-S subbands based on the first subband information and the second preset criterion includes:
the base station determines the PMI of each sub-band in the N-S sub-bands and executes the following operations:
the base station determines a PMI of one of the N-S subbands based on PMIs of one or more of the S subbands adjacent to the one of the N-S subbands.
In a third aspect, an embodiment of the present invention provides a terminal, where the terminal includes:
a first determining module, configured to determine S subbands from the N subbands based on a first preset criterion; the first preset criterion is used for indicating the distribution of the S sub-bands in the N sub-bands, the N sub-bands are sub-bands of a Channel Quality Indicator (CQI) to be calculated, the N is an integer greater than or equal to 1, and the S is less than or equal to the N;
the second determination module is used for determining the CSI to be fed back; the CSI to be fed back is divided into a first partial CSI and a second partial CSI, the first partial CSI comprises a CQI of each sub-band in the N sub-bands, and the second partial CSI comprises a Precoding Matrix Indicator (PMI) of each sub-band in the S sub-bands in the N sub-bands;
and the feedback module is used for feeding back the CSI to be fed back to the base station.
In a possible implementation manner, the value of S is determined by uplink channel resources allocated by the system.
In one possible implementation manner, the first determining module is configured to:
uniformly selecting the S subbands from the N subbands; alternatively, the first and second electrodes may be,
calculating PMI and CQI of each sub-band in the N sub-bands; and sequencing the N sub-bands from large to small according to the CQI value, and determining the first S sub-bands in the sequenced N sub-bands.
In one possible implementation manner, the second determining module is configured to:
determining first subband information, wherein the first subband information comprises PMI and CQI of each subband in the S subbands;
determining second sub-band information based on a second preset criterion and the first sub-band information; wherein the second subband information includes a CQI for each of remaining subbands of the N subbands other than the S subbands;
and determining the CSI to be fed back, wherein the CSI to be fed back comprises the first subband information and the second subband information.
In one possible implementation manner, the second determining module is configured to:
when the CQI of each sub-band in the residual sub-bands is determined, the following operations are executed: determining a CQI for one of the remaining subbands based on PMIs of one or more of the S subbands that are adjacent to the one of the remaining subbands.
In a possible implementation, the first preset criterion and the second preset criterion are predefined by a system or signaled to the terminal by the base station.
In a fourth aspect, an embodiment of the present invention provides a base station, where the base station includes:
the receiving module is used for receiving the CSI fed back by the terminal; the CSI is divided into a first partial CSI and a second partial CSI, the first partial CSI comprises CQI of each of N subbands, the second partial CSI comprises Precoding Matrix Indication (PMI) of each of S subbands of the N subbands, N is an integer greater than or equal to 1, and S is smaller than or equal to N;
a determining module, configured to determine a PMI of each of the N-S subbands based on the CSI and a second preset criterion;
and the scheduling module is used for carrying out resource scheduling on the basis of the PMI and the CQI of each sub-band in the N sub-bands.
In one possible implementation, the determining module is configured to:
determining first subband information from the CSI based on a first preset criterion; wherein the first subband information includes a PMI and a CQI of each of the S subbands, and the first preset criterion is used to indicate distribution of the S subbands in the N subbands;
and determining the PMI of each sub-band in the N-S sub-bands based on the first sub-band information and the second preset criterion.
In one possible implementation, the determining module is configured to:
determining the PMI of each of the N-S subbands, and performing the following operations: determining a PMI of one of the N-S subbands based on PMIs of one or more of the S subbands that are adjacent to the one of the N-S subbands.
In a fifth aspect, an embodiment of the present invention further provides another terminal, including:
at least one processor, and
a memory communicatively coupled to the at least one processor, a communication interface;
wherein the memory stores instructions executable by the at least one processor, the at least one processor performing the method of the first aspect with the communication interface by executing the instructions stored by the memory.
In a sixth aspect, an embodiment of the present invention further provides another base station, including:
at least one processor, and
a memory communicatively coupled to the at least one processor, a communication interface;
wherein the memory stores instructions executable by the at least one processor, and the at least one processor performs the method of the second aspect using the communication interface by executing the instructions stored by the memory.
In a seventh aspect, an embodiment of the present invention provides a computer-readable storage medium, including:
the computer readable storage medium stores computer instructions which, when executed on a computer, cause the computer to perform the method according to the first and second aspects.
In the embodiment of the invention, before reporting CSI, a terminal determines S sub-bands from N sub-bands based on a first preset criterion, then respectively calculates CQI and PMI of each sub-band in the S sub-bands, the terminal determines the CQI of each sub-band in the N-S sub-bands according to the PMI of each sub-band in the S sub-bands, and then sends a first part of CSI comprising the CQI of each sub-band in the N sub-bands and a second part of CSI comprising a precoding matrix indication PMI of each sub-band in the S sub-bands to a base station, so that the base station can perform resource scheduling according to the received CSI, and further ensure that the CQI of each sub-band in the first part of CSI can accurately determine the PMI corresponding to the CQI from the second part of CSI.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram illustrating that CSI is reported in two parts according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a CSI feedback method according to an embodiment of the present invention;
FIG. 3 is a diagram showing CSI for example 1 and example 2 according to the present invention;
FIG. 4 is a diagram illustrating CSI in example 3 of the present invention;
fig. 5 is a schematic flow chart of another CSI feedback method according to an embodiment of the present invention;
fig. 6 is a schematic block diagram of a terminal according to an embodiment of the present invention;
fig. 7 is a block diagram of a base station according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
Some terms of the embodiments of the present invention are briefly described below so that those skilled in the art can easily understand the technical solutions in the embodiments of the present invention.
A type I codebook and a type II codebook are defined in the NR system, wherein the PMI structure of the type II codebook and the PMI feedback overhead in 32 ports are given in a table I and a table II. Wherein Rank 1 represents that the Rank is 1, and Rank 2 represents that the Rank is 2. L represents the number of beams used in beam selection, which may be configured by the base station.
TABLE-PMI feedback overhead (wideband parameters) for 32-Port type II codebooks
Figure BDA0001425231180000071
TABLE two PMI feedback overhead (subband parameters) for 32-Port type II codebook
Figure BDA0001425231180000072
Figure BDA0001425231180000081
In table one and table two, table one gives the wideband parameters and table two gives the subband parameters, where N is 10.
If the terminal uses the type II codebook to report CSI, the CSI may be divided into two parts, i.e., a first part CSI and a second part CSI, for reporting, as shown in fig. 1, assuming that N subbands are in total. The first partial CSI comprises Rank Indication (RI), CQI of each sub-band in N sub-bands and non-zero wideband amplitude coefficient number Indication of each layer; the second partial CSI includes the remaining part of the CSI, i.e., the PMIs given in table one and table two above.
Therefore, in the embodiment of the present invention, before reporting CSI, a terminal determines S subbands from N subbands based on a first preset criterion, then calculates CQI and PMI of each subband in the S subbands, and determines CQI of each subband in the N-S subbands according to the PMI of each subband in the S subbands, and then sends a first partial CSI including the CQI of each subband in the N subbands and a second partial CSI including a precoding matrix indication PMI of each subband in the S subbands to a base station, so that the base station can perform resource scheduling according to the received CSI, and further ensure that the CQI of each subband in the first partial CSI can accurately determine a PMI corresponding to the CQI from the second partial CSI.
In addition, the term "and/or" herein is only one kind of association relationship describing an associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone.
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example one
Referring to fig. 2, an embodiment of the present invention provides a method for feeding back CSI, which may be applied in a terminal, where a process of the method may be described as follows.
S201: the terminal determines S sub-bands from the N sub-bands based on a first preset criterion; the first preset criterion is used for indicating the distribution of S sub-bands in N sub-bands, the N sub-bands are sub-bands of a Channel Quality Indicator (CQI) to be calculated, N is an integer greater than or equal to 1, and S is less than or equal to N;
s202: the terminal determines CSI to be fed back; the CSI to be fed back is divided into a first part CSI and a second part CSI, the first part CSI comprises CQI of each sub-band in N sub-bands, and the second part CSI comprises precoding matrix indication PMI of each sub-band in S sub-bands of the N sub-bands;
s203: and the terminal feeds back the CSI to be fed back to the base station.
In S201, the terminal may determine S subbands from the N subbands according to a first preset criterion, where a value of N may be determined by the terminal according to a bandwidth parameter configured by the system, or may also be determined by the terminal according to a user-defined manner.
In one possible implementation, the determination of S subbands may include, but is not limited to, the following:
first, the terminal may determine a value of S according to uplink channel resources allocated by the system, and then, the terminal may determine S subbands according to distribution of the S subbands in the N subbands.
For example, the terminal determines, according to the uplink channel resource allocated by the system, that the resource can support PMI transmission on 4 subbands, that is, S takes a value of 4, and since the first preset criterion indicates that the terminal uniformly selects S subbands from N subbands, the terminal may determine the 4 subbands from the N subbands according to the distribution of the subbands. For example, if N is 10, the 4 subbands determined by the terminal from the 10 subbands are respectively: subband 1, subband 4, subband 7, and subband 10.
Second, the terminal determines S subbands from the N subbands based on a preset interval, that is, the first preset criterion may be that the terminal uniformly selects S subbands from the N subbands according to the preset interval.
In practical applications, the preset interval may be set in the form of an arithmetic series, an geometric series, or the like. Taking an arithmetic progression form as an example, assuming that the arithmetic progression is 2, that is, the terminal determines S subbands from N subbands according to 1 subband between every two subbands, and if N is 10, the S subbands determined from 10 subbands by the terminal are: subband 1, subband 3, subband 5, subband 7, and subband 9, where S may be determined to be 5.
Thirdly, the terminal may determine the value of S according to the uplink channel resources allocated by the system, then the terminal may calculate the PMI and the CQI of each subband in the N subbands, rank the N subbands from large to small according to the CQI value, and determine the first S subbands in the N subbands after ranking.
The terminal can calculate the PMI of each sub-band in the N sub-bands according to the information such as the bandwidth parameters and the uplink channel resources configured by the system, and then calculate the CQI of each sub-band according to the PMI of each sub-band. Then, the terminal may rank the N subbands according to the order of the CQI values from large to small, and determine the first S subbands in the N ranked subbands, where a value of S may be determined by the terminal according to uplink channel resources allocated by the system, or may also be determined by the terminal according to a user-defined manner, etc.
For example, when N is 10, the terminal first calculates PMI and CQI of each subband in 10 subbands, and sorts the 10 subbands according to CQI values to obtain the first 3 subbands with the largest CQI, where 3 subbands are subband 3, subband 5, and subband 6, respectively.
It should be noted that the determination of the S subbands may be performed in any one or a combination of multiple manners of the above three manners, or may be performed in other manners, and may be selected according to practical applications, and the embodiment of the present invention is not limited specifically.
Then, S202 is carried out, namely the terminal determines CSI to be fed back; the CSI to be fed back is divided into a first part CSI and a second part CSI, the first part CSI comprises CQI of each sub-band in the N sub-bands, and the second part CSI comprises precoding matrix indication PMI of each sub-band in the S sub-bands of the N sub-bands.
When reporting the CSI to the base station, the terminal can divide the CSI into a first part CSI and a second part CSI for reporting, so that the CSI to be fed back determined by the terminal can be divided into the first part CSI and the second part CSI, wherein the first part CSI comprises the CQI of each subband in the N subbands, and the second part CSI comprises the PMI of the precoding matrix of each subband in the S subbands of the N subbands.
Of course, the first partial CSI may further include parameters such as the number indication of non-zero wideband amplitude coefficients, RI, and the like of each layer, and the PMI of each subband includes a wideband PMI and a subband PMI, which may be referred to in table one and table 2.
In one possible implementation manner, the determining, by the terminal, CSI to be fed back may include:
the terminal determines first subband information, wherein the first subband information comprises a PMI and a CQI of each subband in the S subbands, namely the terminal can calculate the PMI and the CQI of each subband in the S subbands according to information such as bandwidth parameters and uplink channel resources configured by a system.
Then, the terminal can determine second sub-band information according to a second preset criterion and the first sub-band information; the second subband information includes CQI of each subband of remaining subbands, except for S subbands, of the N subbands, where the remaining subbands are the N-S subbands, and the second preset criterion may indicate a determination manner of the CQI of the N-S subbands.
That is, the terminal may determine the CQI of each of the remaining subbands of the N subbands according to the PMI and the CQI of the S subbands.
The terminal determines CSI to be fed back, wherein the CSI to be fed back comprises first sub-band information and second sub-band information.
Because the first subband information comprises the PMI and the CQI of each subband in the S subbands, and the second subband information comprises the CQI of each subband in the rest subbands except the S subbands in the N subbands, the terminal can determine the CQI of each subband in the N subbands included in the first part of CSI, and can also determine the PMI of each subband in the S subbands of the N subbands included in the second part of CSI to further determine the CSI to be fed back according to the first subband information and the second subband information.
In a possible implementation manner, the determining, by the terminal, the second subband information based on the second preset criterion and the first subband information may include:
the terminal determines the CQI of each of the remaining subbands, which may be performed in, but not limited to, the following two ways:
in the first mode, the terminal determines the CQI of one subband in the residual subbands based on the PMI of one subband adjacent to the one subband in the residual subbands in the S subbands.
For example, taking N as 10 and S as 4, the 4 subbands determined by the base station may be subband 1, subband 4, subband 7, and subband 10, respectively, so that the remaining subbands are subband 2, subband 3, subband 5, subband 6, subband 8, and subband 9.
At this time, if the second predetermined criterion is that in each of the remaining N-S subbands, the CQI of the subband is calculated using the PMI of the subband adjacent to the subband in the S subbands. At this time, the terminal may calculate CQIs for subband 2 and subband 3 according to the PMI for subband 1 and the channel estimates for subband 2 and subband 3, respectively, where the PMI for one subband includes a wideband PMI constituted by a twiddle factor, a beam selection, a strongest coefficient for each layer, and a wideband amplitude coefficient for each layer, and a subband PMI constituted by a subband amplitude and a phase coefficient for each layer of the corresponding subband.
Similarly, the terminal may calculate CQIs for subband 5 and subband 6 according to the PMI for subband 4 and the respective channel estimates for subband 5 and subband 6; the terminal may calculate the CQIs for subband 8 and subband 9 based on the PMI for subband 7 and the respective channel estimates for subband 8 and subband 9.
And secondly, the terminal determines the CQI of one of the rest subbands based on the PMIs of a plurality of subbands adjacent to the one of the rest subbands in the S subbands, wherein the plurality of adjacent subbands can be 2 or more than 2 subbands.
For example, also taking N as 10 and S as 4, the 4 subbands determined by the base station may be subband 1, subband 4, subband 7, and subband 10, respectively, so that the remaining subbands are subband 2, subband 3, subband 5, subband 6, subband 8, and subband 9.
If the second preset criterion is that in each sub-band of the remaining N-S sub-bands, the CQI of the sub-band is calculated by using the PMIs of a plurality of sub-bands adjacent to the PMIs in the S sub-bands through a linear interpolation algorithm, wherein the adjacent two sub-bands are taken.
At this time, the terminal may obtain the sub-band PMI of sub-band 2 and the sub-band PMI of sub-band 3 by a linear interpolation algorithm according to the PMI of sub-band 1 and the PMI of sub-band 4, respectively, and then calculate the CQI of sub-band 2 according to the sub-band PMI of sub-band 2 and the wideband PMI, that is, the PMI of sub-band 2, and may calculate the CQI of sub-band 3 according to the sub-band PMI of sub-band 3 and the wideband PMI, that is, the PMI of sub-band 3.
The wideband PMIs of 10 sub-bands are the same and comprise a rotation factor, beam selection, the strongest coefficient of each layer and the wideband amplitude coefficient parameter of each layer; and the subband PMI of each of the 10 subbands includes subband amplitude and phase coefficient parameters of each layer of the corresponding subband.
Similarly, the terminal may obtain the sub-band PMI of the sub-band 5 and the sub-band PMI of the sub-band 6 through a linear interpolation algorithm according to the PMI of the sub-band 4 and the PMI of the sub-band 7, respectively, then calculate the CQI of the sub-band 5 according to the sub-band PMI of the sub-band 5 and the wideband PMI, that is, the PMI of the sub-band 5, and may further calculate the CQI of the sub-band 6 according to the sub-band PMI of the sub-band 6 and the wideband PMI, that is, the PMI of.
Accordingly, the terminal may obtain the sub-band PMI of the sub-band 8 and the sub-band PMI of the sub-band 9 through a linear interpolation algorithm according to the PMI of the sub-band 7 and the PMI of the sub-band 10, respectively, then calculate the CQI of the sub-band 8 according to the sub-band PMI of the sub-band 8 and the wideband PMI, that is, the PMI of the sub-band 8, and may further calculate the CQI of the sub-band 9 according to the sub-band PMI of the sub-band 9 and the wideband PMI, that is, the PMI of.
In a possible implementation, the first preset criterion and the second preset criterion may be predefined by the system or may be signaled to the terminal by the base station.
And then, S203 is performed, that is, the terminal feeds back the CSI to be fed back to the base station, so that the base station can schedule resources according to the CSI after receiving the CSI reported by the terminal.
For convenience of understanding, the following examples are provided to describe the above technical solutions in the embodiments of the present invention in detail, and it should be noted that the following examples are only illustrative and are not intended to limit the technical solutions of the present invention.
Example 1, as shown in fig. 3, the terminal may determine N-10 subbands for which CQIs are to be calculated according to bandwidth parameters configured by the system, and the base station determines S-4, which are subband 1, subband 4, subband 7, and subband 10, respectively, by using the first of the three manners for determining S subbands, so that the terminal determines that the second CSI portion needs to include a PMI of each subband in the 4 subbands.
In each of the S-4 subbands, the terminal calculates a PMI and a CQI for each subband. That is, the terminal needs to calculate not only RI, wideband PMI, i.e. twiddle factor, beam selection, strongest coefficient of each layer, wideband amplitude coefficient of each layer, but also subband amplitude and/or phase coefficient of each layer of the 1 st subband, and CQI of the 1 st subband corresponding thereto; the sub-band amplitude and/or phase coefficient of each layer of the 4 th sub-band and the CQI of the corresponding 4 th sub-band; the amplitude and/or phase coefficient of each layer of the 7 th sub-band and the CQI of the corresponding 7 th sub-band; the subband amplitude and/or phase coefficient of each layer of the 10 th subband, and its corresponding CQI of the 10 th subband.
Then, if the terminal adopts one of the two ways of determining the CQI of each of the remaining subbands, that is, the second preset criterion is that in each of the remaining N-S subbands, the PMI of one subband adjacent to the terminal in the S subbands is used to calculate the CQI of the subband, and then the terminal may calculate the CQIs of the 2 nd and 3 rd subbands according to the wideband PMI, that is, the twiddle factor, the beam selection, the strongest coefficient of each layer, the wideband amplitude coefficient of each layer, and the subband amplitude and/or phase coefficient of each layer of the 1 st subband; calculating the CQI of the 5 th sub-band and the 6 th sub-band according to the wideband PMI and the sub-band amplitude and/or phase coefficient of each layer of the 4 th sub-band; and calculating the CQI of 8 th and 9 th sub-bands according to the wideband PMI and the sub-band amplitude and/or phase coefficient of each layer of the 7 th sub-band.
And further, the terminal feeds back the first partial CSI and the second partial CSI to the base station.
In example 2 and still referring to fig. 3, the terminal may determine N-10 subbands for which CQIs are to be calculated according to bandwidth parameters configured by the system, and the base station determines S-4, which are subband 1, subband 4, subband 7, and subband 10, respectively, by using the first of the three manners for determining S subbands, so that the terminal determines that the second CSI portion needs to include a PMI of each subband in the 4 subbands.
In each of the S-4 subbands, the terminal calculates a PMI and a CQI for each subband. That is, the terminal needs to calculate not only RI, wideband PMI, i.e. twiddle factor, beam selection, strongest coefficient of each layer, wideband amplitude coefficient of each layer, but also subband amplitude and/or phase coefficient of each layer of the 1 st subband, and CQI of the 1 st subband corresponding thereto; the sub-band amplitude and/or phase coefficient of each layer of the 4 th sub-band and the CQI of the corresponding 4 th sub-band; the amplitude and/or phase coefficient of each layer of the 7 th sub-band and the CQI of the corresponding 7 th sub-band; the subband amplitude and/or phase coefficient of each layer of the 10 th subband, and its corresponding CQI of the 10 th subband.
Then, if the terminal adopts the second of the two ways of determining the CQI of each of the remaining subbands, that is, the second preset criterion is that, in each of the remaining N-S subbands, the PMI of two adjacent subbands in the S subbands is used, and the CQI of the subband is calculated through a linear interpolation algorithm.
The terminal calculates the sub-band amplitude and/or phase coefficient of each layer of the 1 st sub-band and the sub-band amplitude and/or phase coefficient of each layer of the 4 th sub-band through linear interpolation algorithm to obtain the sub-band amplitude and/or phase coefficient of each layer, and calculates the CQI of the 2 nd and 3 rd sub-bands by combining the wideband PMI, namely, the twiddle factor, the beam selection, the strongest coefficient of each layer and the wideband amplitude coefficient of each layer.
Similarly, the terminal calculates the subband amplitude and/or phase coefficient of each layer of the 4 th subband and the subband amplitude and/or phase coefficient of each layer of the 7 th subband through a linear interpolation algorithm, and calculates the CQI of the 5 th subband and the 6 th subband by combining the wideband PMI.
And the terminal calculates the subband amplitude and/or the phase coefficient of each layer of the 7 th subband and the subband amplitude and/or the phase coefficient of each layer of the 10 th subband through a linear interpolation algorithm, and calculates the CQI of the 8 th subband and the 9 th subband by combining the wideband PMI.
And further, the terminal feeds back the first partial CSI and the second partial CSI to the base station.
Example 3, as shown in fig. 4, the terminal may determine, according to the bandwidth parameter configured by the system, N-10 subbands for which CQIs are to be calculated, and the base station determines, S-3 by using the third of the three manners for determining, that is, the terminal first calculates PMI and CQI of the N-10 subbands, and then selects, according to a first preset criterion, 3 subbands with the highest CQI from the N subbands, assuming that the subbands are subband 3, subband 5, and subband 6, respectively, and therefore, the terminal determines that the second CSI portion needs to include PMI of each subband in the 3 subbands.
Then, if the terminal uses one of the two ways of determining the CQI of each of the remaining subbands, that is, the second preset criterion, to calculate the CQI of each subband adjacent to the PMI of the S subband in each subband of the remaining N-S subbands, the terminal may recalculate the CQIs of the 1 st and 2 nd subbands according to the wideband PMI, that is, the twiddle factor, the beam selection, the strongest coefficient of each layer, the wideband amplitude coefficient of each layer, and the subband amplitude and/or phase coefficient of each layer of the 3 rd subband.
Similarly, the terminal may recalculate the CQI of the 4 th subband according to the wideband PMI and the subband amplitude and/or phase coefficient of each layer of the 5 th subband. The terminal can calculate the CQIs of the 7 th, 8 th, 9 th and 10 th sub-bands according to the wideband PMI and the sub-band amplitude and/or phase coefficient of each layer of the 6 th sub-band, and since the channel characteristics experienced by each of the 10 sub-bands are different, the CQIs corresponding to each of the 10 sub-bands are inconsistent.
And further, the terminal feeds back the first partial CSI and the second partial CSI to the base station.
In summary, one or more of the above technical solutions have at least the following technical effects.
First, in the embodiments of the present invention, before reporting CSI, a terminal determines S subbands from N subbands based on a first preset criterion, then calculates CQI and PMI of each subband in the S subbands, and determines CQI of each subband in N-S subbands according to the PMI of each subband in the S subbands, and then sends a first partial CSI including the CQI of each subband in the N subbands and a second partial CSI including a precoding matrix indicator PMI of each subband in the S subbands to a base station, so that the base station can perform resource scheduling according to the received CSI, and further ensure that the CQI of each subband in the first partial CSI can accurately determine a PMI corresponding to the CQI from the second partial CSI.
Secondly, in the embodiment of the invention, when the terminal feeds back the CSI, only PMIs of S sub-bands in N sub-bands need to be fed back, so that uplink channel resources are saved.
In the CSI reported by the terminal to the base station, the second part of CSI includes only PMIs of S subbands, and the subsequent base station may determine PMIs of the remaining N-S subbands according to the second preset criterion and the PMIs of the S subbands, so as to ensure that the CQI of each subband in the first part of CSI can accurately determine the corresponding PMI from the second part of CSI, so that the base station may use the CQIs of all subbands for scheduling, thereby ensuring the feedback accuracy of CSI and further improving the system performance.
Example two
Referring to fig. 5, another CSI feedback method provided in the embodiments of the present invention may be applied to a base station, where the process of the method may be described as follows:
s501: the base station receives CSI fed back by the terminal; the CSI is divided into a first part CSI and a second part CSI, the first part CSI comprises CQI of each sub-band in N sub-bands, the second part CSI comprises precoding matrix indication PMI of each sub-band in S sub-bands of the N sub-bands, N is an integer larger than or equal to 1, and S is smaller than or equal to N;
s502: the base station determines the PMI of each sub-band in the N-S sub-bands based on the CSI and a second preset criterion;
s503: and the base station performs resource scheduling based on the PMI and the CQI of each sub-band in the N sub-bands.
In S502, the second predetermined criterion may indicate a determination manner of PMIs of the remaining N-S subbands, and the N-S subbands are the remaining subbands except S subbands in the N subbands.
In a possible implementation manner, the determining, by the base station, the PMI of each of the N-S subbands based on the CSI and a second preset criterion may include:
the base station determines first subband information from the CSI based on a first preset criterion; the first subband information comprises PMI and CQI of each subband in S subbands, and the first preset criterion is used for indicating the distribution of the S subbands in the N subbands;
and the base station determines the PMI of each sub-band in the N-S sub-bands based on the first sub-band information and a second preset criterion.
In a possible implementation manner, the determining, by the base station, the PMI of each subband in the N-S subbands based on the first subband information and the second preset criterion may include:
the base station determines the PMI of each of the N-S subbands and performs the following operations: the base station determines the PMI of one of the N-S subbands based on the PMIs of one or more of the S subbands adjacent to the one of the N-S subbands.
For convenience of understanding, the following describes the technical solution of the second embodiment by referring to several examples.
Example 4, it is assumed that the terminal feeds back the first partial CSI and the second partial CSI to the base station by using the method in example 1 in the first embodiment.
At this time, the base station receives CSI reported by the terminal, and may then determine the subband PMI of the 1 st, 4 th, 7 th, and 10 th subbands included in the second part CSI according to a first preset criterion.
Then, the base station may determine, according to the PMI of each of the determined 4 subbands and according to a second preset criterion, that the 2 nd subband and the 3 rd subband use the PMI of the 1 st subband, and determine the PMIs of the 2 nd subband and the 3 rd subband by combining the wideband PMI; the 5 th sub-band and the 6 th sub-band use the sub-band PMI of the 4 th sub-band, and the PMI of the 5 th sub-band and the 6 th sub-band is determined by combining the wideband PMI; and the 8 th and 9 th sub-bands adopt the sub-band PMI of the 7 th sub-band and determine the PMIs of the 8 th and 9 th sub-bands by combining the wideband PMI.
Further, the base station may perform scheduling according to the PMI for N-10 subbands and the CQI for the corresponding N-10 subbands.
Example 5, assume that the terminal feeds back the first partial CSI and the second partial CSI to the base station by using the method of example 2 in the first embodiment.
At this time, the base station receives CSI reported by the terminal, and may then determine the subband PMI of the 1 st, 4 th, 7 th, and 10 th subbands included in the second part CSI according to a first preset criterion.
Then, the base station may determine, according to the PMI of each of the determined 4 subbands and according to a second preset criterion, a subband PMI of the 1 st subband and a subband PMI of the 4 th subband through a linear interpolation algorithm, determine a subband PMI of the 2 nd and 3 rd subbands, and determine the PMI of the 2 nd and 3 th subbands in combination with the wideband PMI; determining the PMIs of the 5 th and 6 th sub-bands by using the PMI of the 4 th sub-band and the PMI of the 7 th sub-band through a linear interpolation algorithm, and determining the PMIs of the 5 th and 6 th sub-bands by combining a wideband PMI; and determining the PMIs of the 8 th and 9 th sub-bands by using the PMI of the 7 th sub-band and the PMI of the 10 th sub-band through a linear interpolation algorithm, and determining the PMIs of the 8 th and 9 th sub-bands by combining the PMI of the broadband.
Further, the base station may perform scheduling according to the PMI for N-10 subbands and the CQI for the corresponding N-10 subbands.
In example 6, it is assumed that the terminal feeds back the first partial CSI and the second partial CSI to the base station in the manner of example 3 in the first embodiment.
At this time, the base station receives the CSI reported by the terminal, and then may determine that the second CSI portion includes the subband PMI of the 3 rd, 5 th, and 6 th subbands according to the first preset criterion.
Then, the base station may determine, according to the PMI of each subband in the determined 3 subbands and according to a second preset criterion, that the 1 st subband and the 3 rd subband are used by the 2 nd subband, and determine the PMIs of the 1 st subband and the 2 nd subband by combining the wideband PMI; the 4 th sub-band uses the sub-band PMI of the 5 th sub-band, and determines the PMI of the 4 th sub-band by combining the wideband PMI; and the 7 th, 8 th, 9 th and 10 th sub-bands follow the sub-band PMI of the 6 th sub-band, and the PMIs of the 7 th, 8 th, 9 th and 10 th sub-bands are determined by combining the wideband PMI.
Further, the base station may perform scheduling according to the PMI for N-10 subbands and the CQI for the corresponding N-10 subbands.
In summary, one or more of the above technical solutions have at least the following technical effects.
In the embodiment of the invention, in the CSI reported by the terminal to the base station, the second part of CSI only comprises PMIs of S sub-bands, and the subsequent base station can determine the PMIs of the remaining N-S sub-bands according to the PMIs of the S sub-bands according to a second preset criterion, so that the CQI of each sub-band in the first part of CSI can accurately determine the corresponding PMI from the second part of CSI, the base station can use the CQI of all sub-bands for scheduling, the feedback precision of the CSI is ensured, and the system performance is improved.
EXAMPLE III
Referring to fig. 6, an embodiment of the present invention provides a terminal, where the terminal includes:
a first determining module 61, configured to determine S subbands from the N subbands based on a first preset criterion; the first preset criterion is used for indicating the distribution of the S sub-bands in the N sub-bands, the N sub-bands are sub-bands of a Channel Quality Indicator (CQI) to be calculated, the N is an integer greater than or equal to 1, and the S is less than or equal to the N;
a second determining module 62, configured to determine CSI to be fed back; the CSI to be fed back is divided into a first partial CSI and a second partial CSI, the first partial CSI comprises a CQI of each sub-band in the N sub-bands, and the second partial CSI comprises a Precoding Matrix Indicator (PMI) of each sub-band in the S sub-bands in the N sub-bands;
and a feedback module 63, configured to feed back the CSI to be fed back to the base station.
In a possible implementation manner, the value of S is determined by uplink channel resources allocated by the system.
In a possible implementation manner, the first determining module 61 is configured to:
uniformly selecting the S subbands from the N subbands; alternatively, the first and second electrodes may be,
calculating PMI and CQI of each sub-band in the N sub-bands; and sequencing the N sub-bands from large to small according to the CQI value, and determining the first S sub-bands in the sequenced N sub-bands.
In one possible implementation, the second determining module 62 is configured to:
determining first subband information, wherein the first subband information comprises PMI and CQI of each subband in the S subbands;
determining second sub-band information based on a second preset criterion and the first sub-band information; wherein the second subband information includes a CQI for each of remaining subbands of the N subbands other than the S subbands;
and determining the CSI to be fed back, wherein the CSI to be fed back comprises the first subband information and the second subband information.
In one possible implementation, the second determining module 62 is configured to:
when the CQI of each sub-band in the residual sub-bands is determined, the following operations are executed:
determining a CQI for one of the remaining subbands based on PMIs of one or more of the S subbands that are adjacent to the one of the remaining subbands.
In a possible implementation, the first preset criterion and the second preset criterion are predefined by a system or signaled to the terminal by the base station.
Example four
Referring to fig. 7, an embodiment of the present invention provides a base station, where the base station includes:
a receiving module 71, configured to receive CSI fed back by the terminal; the CSI is divided into a first partial CSI and a second partial CSI, the first partial CSI comprises CQI of each of N subbands, the second partial CSI comprises Precoding Matrix Indication (PMI) of each of S subbands of the N subbands, N is an integer greater than or equal to 1, and S is smaller than or equal to N;
a determining module 72, configured to determine a PMI for each of the N-S subbands based on the CSI and a second preset criterion;
and a scheduling module 73, configured to perform resource scheduling based on the PMI and CQI of each subband in the N subbands.
In one possible implementation, the determining module 72 is configured to:
determining first subband information from the CSI based on a first preset criterion; wherein the first subband information includes a PMI and a CQI of each of the S subbands, and the first preset criterion is used to indicate distribution of the S subbands in the N subbands;
and determining the PMI of each sub-band in the N-S sub-bands based on the first sub-band information and the second preset criterion.
In one possible implementation, the determining module 72 is configured to:
determining the PMI of each of the N-S subbands, and performing the following operations:
determining a PMI of one of the N-S subbands based on PMIs of one or more of the S subbands that are adjacent to the one of the N-S subbands.
EXAMPLE five
Based on the same inventive concept, an embodiment of the present invention provides a terminal, where the terminal includes:
at least one processor, and
a memory communicatively coupled to the at least one processor, a communication interface;
wherein the memory stores instructions executable by the at least one processor, and the at least one processor performs the method of embodiment one using the communication interface by executing the instructions stored by the memory.
EXAMPLE six
Based on the same inventive concept, an embodiment of the present invention provides a base station, where the base station includes:
at least one processor, and
a memory communicatively coupled to the at least one processor, a communication interface;
wherein the memory stores instructions executable by the at least one processor, and the at least one processor performs the method of embodiment two using the communication interface by executing the instructions stored by the memory.
EXAMPLE seven
Based on the same inventive concept, embodiments of the present invention provide a computer-readable storage medium, which stores computer instructions that, when executed on a computer, cause the computer to perform the method according to the first embodiment and the second embodiment.
In particular implementations, the computer-readable storage medium includes: various storage media capable of storing program codes, such as a Universal Serial Bus flash drive (USB), a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, and an optical disk.
The above-described embodiments of the apparatus are merely illustrative, and units or modules described as separate parts may or may not be physically separate, and parts displayed as units or modules may or may not be physical units or modules, may be located in one place, or may be distributed on a plurality of network units or modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as ROM or RAM, a magnetic disk, an optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (21)

1. A method for feeding back Channel State Information (CSI), the method comprising:
the terminal determines S sub-bands from the N sub-bands based on a first preset criterion; the first preset criterion is used for indicating the distribution of the S sub-bands in the N sub-bands, the N sub-bands are sub-bands of a Channel Quality Indicator (CQI) to be calculated, the N is an integer greater than or equal to 1, and the S is less than or equal to the N;
the terminal determines CSI to be fed back; the CSI to be fed back is divided into a first partial CSI and a second partial CSI, the first partial CSI comprises a CQI of each sub-band in the N sub-bands, and the second partial CSI comprises a Precoding Matrix Indicator (PMI) of each sub-band in the S sub-bands in the N sub-bands;
and the terminal feeds back the CSI to be fed back to the base station.
2. The method of claim 1, wherein the value of S is determined by uplink channel resources allocated by a system.
3. The method of claim 1, wherein the terminal determines S subbands from among the N subbands based on a first preset criterion, comprising:
the terminal uniformly selects the S sub-bands from the N sub-bands; alternatively, the first and second electrodes may be,
the terminal calculates PMI and CQI of each sub-band in the N sub-bands; and the terminal sorts the N sub-bands from large to small according to the CQI value and determines the first S sub-bands in the N sorted sub-bands.
4. The method of any of claims 1-3, wherein the terminal determining the CSI to be fed back comprises:
the terminal determines first subband information, wherein the first subband information comprises PMI and CQI of each subband in the S subbands;
the terminal determines second sub-band information based on a second preset criterion and the first sub-band information; wherein the second subband information includes a CQI for each of remaining subbands of the N subbands other than the S subbands;
the terminal determines the CSI to be fed back, wherein the CSI to be fed back comprises the first subband information and the second subband information.
5. The method of claim 4, wherein the terminal determining second subband information based on a second predetermined criterion and the first subband information comprises:
when the terminal determines the CQI of each sub-band in the remaining sub-bands, the following operations are executed:
and the terminal determines the CQI of one of the residual sub-bands based on the PMIs of one or more sub-bands in the S sub-bands adjacent to the one of the residual sub-bands.
6. The method of claim 5, wherein the first preset criterion and the second preset criterion are predefined by a system or signaled to the terminal by the base station.
7. A method for feeding back Channel State Information (CSI), the method comprising:
the base station receives CSI fed back by the terminal; the CSI is divided into a first partial CSI and a second partial CSI, the first partial CSI comprises CQI of each of N subbands, the second partial CSI comprises Precoding Matrix Indication (PMI) of each of S subbands of the N subbands, N is an integer greater than or equal to 1, and S is smaller than or equal to N;
the base station determines the PMI of each sub-band in the N-S sub-bands based on the CSI and a second preset criterion;
and the base station carries out resource scheduling based on the PMI and the CQI of each sub-band in the N sub-bands.
8. The method of claim 7, wherein the base station determines the PMI for each of the N-S subbands based on the CSI and a second preset criterion, comprising:
the base station determines first subband information from the CSI based on a first preset criterion; wherein the first subband information includes a PMI and a CQI of each of the S subbands, and the first preset criterion is used to indicate distribution of the S subbands in the N subbands;
and the base station determines the PMI of each subband in the N-S subbands based on the first subband information and the second preset criterion.
9. The method of claim 8, wherein the base station determining the PMI for each of the N-S subbands based on the first subband information and the second preset criterion comprises:
the base station determines the PMI of each sub-band in the N-S sub-bands and executes the following operations:
the base station determines a PMI of one of the N-S subbands based on PMIs of one or more of the S subbands adjacent to the one of the N-S subbands.
10. A terminal, characterized in that the terminal comprises:
a first determining module, configured to determine S subbands from the N subbands based on a first preset criterion; the first preset criterion is used for indicating the distribution of the S sub-bands in the N sub-bands, the N sub-bands are sub-bands of a Channel Quality Indicator (CQI) to be calculated, the N is an integer greater than or equal to 1, and the S is less than or equal to the N;
the second determination module is used for determining the CSI to be fed back; the CSI to be fed back is divided into a first partial CSI and a second partial CSI, the first partial CSI comprises a CQI of each sub-band in the N sub-bands, and the second partial CSI comprises a Precoding Matrix Indicator (PMI) of each sub-band in the S sub-bands in the N sub-bands;
and the feedback module is used for feeding back the CSI to be fed back to the base station.
11. The terminal of claim 10, wherein the value of S is determined by uplink channel resources allocated by a system.
12. The terminal of claim 11, wherein the first determining module is configured to:
uniformly selecting the S subbands from the N subbands; alternatively, the first and second electrodes may be,
calculating PMI and CQI of each sub-band in the N sub-bands; and sequencing the N sub-bands from large to small according to the CQI value, and determining the first S sub-bands in the sequenced N sub-bands.
13. The terminal of any of claims 10-12, wherein the second determining module is to:
determining first subband information, wherein the first subband information comprises PMI and CQI of each subband in the S subbands;
determining second sub-band information based on a second preset criterion and the first sub-band information; wherein the second subband information includes a CQI for each of remaining subbands of the N subbands other than the S subbands;
and determining the CSI to be fed back, wherein the CSI to be fed back comprises the first subband information and the second subband information.
14. The terminal of claim 13, wherein the second determining module is configured to:
when the CQI of each sub-band in the residual sub-bands is determined, the following operations are executed:
determining a CQI for one of the remaining subbands based on PMIs of one or more of the S subbands that are adjacent to the one of the remaining subbands.
15. The terminal of claim 14, wherein the first predetermined criterion and the second predetermined criterion are predefined by a system or signaled to the terminal by the base station.
16. A base station, characterized in that the base station comprises:
the receiving module is used for receiving the CSI fed back by the terminal; the CSI is divided into a first partial CSI and a second partial CSI, the first partial CSI comprises CQI of each of N subbands, the second partial CSI comprises Precoding Matrix Indication (PMI) of each of S subbands of the N subbands, N is an integer greater than or equal to 1, and S is smaller than or equal to N;
a determining module, configured to determine a PMI of each of the N-S subbands based on the CSI and a second preset criterion;
and the scheduling module is used for carrying out resource scheduling on the basis of the PMI and the CQI of each sub-band in the N sub-bands.
17. The base station of claim 16, wherein the determining module is configured to:
determining first subband information from the CSI based on a first preset criterion; wherein the first subband information includes a PMI and a CQI of each of the S subbands, and the first preset criterion is used to indicate distribution of the S subbands in the N subbands;
and determining the PMI of each sub-band in the N-S sub-bands based on the first sub-band information and the second preset criterion.
18. The base station of claim 17, wherein the determining module is configured to:
determining the PMI of each of the N-S subbands, and performing the following operations:
determining a PMI of one of the N-S subbands based on PMIs of one or more of the S subbands that are adjacent to the one of the N-S subbands.
19. A terminal, characterized in that the terminal comprises:
at least one processor, and
a memory communicatively coupled to the at least one processor, a communication interface;
wherein the memory stores instructions executable by the at least one processor, the at least one processor performing the method of any one of claims 1-6 with the communications interface by executing the instructions stored by the memory.
20. A base station, characterized in that the base station comprises:
at least one processor, and
a memory communicatively coupled to the at least one processor, a communication interface;
wherein the memory stores instructions executable by the at least one processor to perform the method of any one of claims 7-9 using the communication interface by executing the instructions stored by the memory.
21. A computer-readable storage medium characterized by:
the computer readable storage medium stores computer instructions that, when executed on a computer, cause the computer to perform the method of any of claims 1-9.
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