CN111385073A - CSI reporting method and device, storage medium and user terminal - Google Patents

CSI reporting method and device, storage medium and user terminal Download PDF

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Publication number
CN111385073A
CN111385073A CN201811617457.1A CN201811617457A CN111385073A CN 111385073 A CN111385073 A CN 111385073A CN 201811617457 A CN201811617457 A CN 201811617457A CN 111385073 A CN111385073 A CN 111385073A
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parameter values
transmission points
csi
cqi
reporting
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CN111385073B (en
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王钰华
苗润泉
王化磊
杨毅
蔡红亮
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Spreadtrum Semiconductor Nanjing Co Ltd
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Spreadtrum Semiconductor Nanjing 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
    • H04L5/003—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

Abstract

A CSI reporting method and device, a storage medium and a user terminal are provided, the method comprises: determining CSI information to be reported to N transmission points, wherein the CSI information comprises N CRI parameter values, N RI parameter values, PMI parameter values of N transmission points and CQI parameter values of N transmission points; if the bit number of the CSI information is larger than a preset bearing bit number, sequentially discarding a part of parameter values in the CSI information according to a preset discarding sequence; reporting the rest part of the CSI information to the N transmission points; the N CRI parameter values correspond to the N transmission points one by one, the N RI parameter values correspond to the N transmission points one by one, the PMI parameter values of the N transmission points correspond to the N transmission points one by one, and the CQI parameter values of the N transmission points correspond to the N transmission points one by one. The scheme can better adapt to the Multi-TRP scene in the 5G NR R16.

Description

CSI reporting method and device, storage medium and user terminal
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a CSI reporting method and apparatus, a storage medium, and a user terminal.
Background
In the standard of the New Radio (NR) technology R15 of 5G, a User Equipment (UE) reports Channel State Information (CSI) to a network side (e.g., a base station) to inform the network side of the current Channel condition, so that the network side changes a transmission strategy to optimize scheduling.
Specifically, a Type-one (Type I) CSI reporting mode or a Type-two (Type II) CSI reporting mode may be selected. The parameters reported by the Type I CSI may include a Channel State Information-Reference Signal Resource Indicator (CRI), a Rank Indicator (RI), a Precoding Matrix Indicator (PMI), and Channel Quality Information (CQI); the parameters reported by the Type II CSI can include RI, CQI, the number of wideband nonzero amplitude coefficients of each layer and PMI.
Further, when the bit number of the CSI information is greater than the preset carrying bit number, a part of the CSI information is discarded, and a discarding rule is already used in the prior art.
However, the above discarding rule is only applicable to a single transmission Point (TRP), and in a scenario of a Multi-TRP (Multi-TRP) of the 5G NRR16 standard, joint CSI information reporting is performed, Uplink Channel Information (UCI) includes CSI feedback information of N TRPs, and the UE needs to report CSI information to multiple TRPs.
However, in the prior art, for a scenario where CSI information is jointly reported by Multi-TRP, there is no CSI information discarding rule set, so that the existing discarding rule cannot adapt to the scenario of Multi-TRP in 5G NR 16.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a CSI reporting method and device, a storage medium and a user terminal, which can better adapt to the Multi-TRP scene in 5G NR R16.
In order to solve the above technical problem, an embodiment of the present invention provides a CSI reporting method, including the following steps: determining CSI information to be reported to N transmission points, wherein the CSI information comprises N CRI parameter values, N RI parameter values, PMI parameter values of N transmission points and CQI parameter values of N transmission points; if the bit number of the CSI information is larger than a preset bearing bit number, sequentially discarding a part of parameter values in the CSI information according to a preset discarding sequence; reporting the rest part of the CSI information to the N transmission points; the N CRI parameter values correspond to the N transmission points one to one, the N RI parameter values correspond to the N transmission points one to one, the PMI parameter values of the N transmission points correspond to the N transmission points one to one, the CQI parameter values of the N transmission points correspond to the N transmission points one to one, and N is greater than or equal to 2.
Optionally, the N transmission points have preset sequence numbers, and the sequentially discarding a part of the parameter values in the CSI information according to a preset discarding order includes: and if the bit number of the PMI parameter values of the N transmission points subtracted by the bit number of the CSI information is less than or equal to the preset bearing bit number, sequentially discarding the PMI parameter values corresponding to each transmission point according to the reverse order of the serial numbers of the N transmission points until the bit number of the rest part in the CSI information is less than or equal to the preset bearing bit number.
Optionally, the CSI information includes wideband CSI information and narrowband CSI information, and the sequentially discarding a part of parameter values in the CSI information according to a preset discarding order includes: if the result of subtracting the bit number of the PMI parameter values of the N transmission points from the bit number of the CSI information is less than or equal to the preset bearing bit number, sequentially discarding a part of the CSI information according to the following sequence until the bit number of the rest part in the CSI information is less than or equal to the preset bearing bit number: according to the sequence of the CQI parameter values from high to low in the narrow-band CSI information, sequentially discarding the PMI parameter values of the transmission points corresponding to the CQI parameter values; and according to the sequence of the CQI parameter values from high to low in the broadband CSI information, sequentially discarding the PMI parameter values corresponding to the same transmission points as the CQI parameter values.
Optionally, the CSI information includes a reporting part and a selective reporting part; when reporting by adopting Type I CSI, the selective reporting part comprises PMI parameter values of the N transmission points, and the part needing to be reported comprises the N CRI parameter values, the N RI parameter values and CQI parameter values of the N transmission points; when Type II CSI reporting is adopted, the selection reporting part comprises PMI parameter values of the N transmission points, and the part needing to be reported comprises the N RI parameter values, CQI parameter values of the N transmission points and the number of the broadband nonzero amplitude coefficients of each layer corresponding to each transmission point.
Optionally, the CSI information includes wideband CSI information and narrowband CSI information, the N transmission points have preset sequence numbers, and the sequentially discarding a part of parameter values in the CSI information according to a preset discarding order includes: if the result of subtracting the PMI parameter values of the N transmission points and the bit numbers of the N-1 CQI parameter values from the bit number of the CSI information is less than or equal to the preset bearing bit number, sequentially discarding a part of the CSI information according to the following sequence until the bit number of the rest part in the CSI information is less than or equal to the preset bearing bit number: according to the sequence of the CQI parameter values from high to low in the narrow-band CSI information, sequentially discarding the PMI parameter values of the transmission points corresponding to the CQI parameter values; according to the sequence of CQI parameter values from high to low in the broadband CSI information, sequentially discarding PMI parameter values corresponding to the same transmission points as the CQI parameter values; except for the transmission points corresponding to the preset CQI parameter values, the CQI parameter values corresponding to the transmission points are discarded in sequence according to the reverse sequence of the serial numbers of the N-1 transmission points.
Optionally, when Type I CSI reporting is adopted, the preset CQI parameter value is the smallest one of the CQI parameter values of the N transmission points or a CQI parameter value corresponding to the first transmission point; when Type II CSI reporting is adopted, the preset CQI parameter value is the minimum CQI parameter value of the CQI parameter values of the N transmission points or the CQI parameter value corresponding to the first transmission point.
Optionally, the CSI information includes a reporting part and a selective reporting part; when Type I CSI is adopted for reporting, the selective reporting part comprises PMI parameter values of the N transmission points and the N-1 CQI parameter values, and the part which needs to be reported comprises the N CRI parameter values, the N RI parameter values and the preset CQI parameter values; when a type II CSI is adopted for reporting, the selection reporting part comprises PMI parameter values of the N transmission points and the N-1 CQI parameter values, and the part which needs to be reported comprises the N RI parameter values, the number of the nonzero amplitude coefficients of each layer of the broadband corresponding to each transmission point and the preset CQI parameter value.
Optionally, when Type I CSI reporting is adopted, the reporting sequence of the part that needs to be reported is as follows: the parameter value set from the first transmission point to the parameter value set from the Nth transmission point and the preset CQI parameter value, the parameter value set of the ith transmission point comprises a CRI parameter value and an RI parameter value corresponding to the ith transmission point, and i is a positive integer from 1 to N; when the Type II CSI is adopted for reporting, the reporting sequence of the part which needs to be reported is as follows: the parameter value set from the first transmission point to the parameter value set from the Nth transmission point and the preset CQI parameter value, the parameter value set of the ith transmission point comprises the RI parameter value corresponding to the ith transmission point and the number of the wideband nonzero amplitude coefficients of each layer, and i is a positive integer between 1 and N.
Optionally, the CSI information includes wideband CSI information and narrowband CSI information, the N transmission points have preset sequence numbers, and the sequentially discarding a part of parameter values in the CSI information according to a preset discarding order includes: if the bit number of the CSI information minus the bit numbers of the PMI parameter values, the N-1 CQI parameter values and the N-1 RI parameter values of the N transmission points is less than or equal to the preset bearing bit number, sequentially discarding a part of the CSI information according to the following sequence until the bit number of the rest part in the CSI information is less than or equal to the preset bearing bit number: according to the sequence of the CQI parameter values from high to low in the narrow-band CSI information, sequentially discarding the PMI parameter values of the transmission points corresponding to the CQI parameter values; according to the sequence of CQI parameter values from high to low in the broadband CSI information, sequentially discarding PMI parameter values corresponding to the same transmission points as the CQI parameter values; except for the transmission points corresponding to the preset CQI parameter values, sequentially discarding the CQI parameter values corresponding to the transmission points according to the reverse sequence of the serial numbers of the N-1 transmission points; except the first transmission point, sequentially discarding the RI parameter values corresponding to the transmission points according to the reverse order of the sequence numbers of the N-1 transmission points.
Optionally, when Type I CSI reporting is adopted, the preset CQI parameter value is the smallest one of the CQI parameter values of the N transmission points or a CQI parameter value corresponding to the first transmission point; when Type II CSI reporting is adopted, the preset CQI parameter value is the minimum CQI parameter value of the CQI parameter values of the N transmission points or the CQI parameter value corresponding to the first transmission point.
Optionally, the CSI information includes a reporting part and a selective reporting part; when Type I CSI is adopted for reporting, the selective reporting part comprises PMI parameter values of the N transmission points, the N-1 CQI parameter values and the N-1 RI parameter values, and the part needing to be reported comprises the N CRI parameter values, the RI parameter value corresponding to the first transmission point and the preset CQI parameter value; when Type II CSI reporting is adopted, the selection reporting part comprises PMI parameter values of the N transmission points, the N-1 CQI parameter values and the N-1 RI parameter values, and the part needing to be reported comprises the RI parameter value corresponding to the first transmission point, the number of the nonzero amplitude coefficient of each layer of the broadband corresponding to each transmission point and the preset CQI parameter value.
Optionally, when Type I CSI reporting is adopted, the reporting sequence of the part that needs to be reported is as follows: the CRI parameter value corresponding to the first transmission point, the RI parameter value corresponding to the first transmission point, the CRI parameter value corresponding to the second transmission point to the Nth transmission point and the preset CQI parameter value; when the Type II CSI is adopted for reporting, the reporting sequence of the part which needs to be reported is as follows: the RI parameter value corresponding to the first transmission point, the number of the broadband nonzero amplitude coefficients of each layer corresponding to the first transmission point, the preset CQI parameter value and the number of the broadband nonzero amplitude coefficients of each layer corresponding to the second transmission point to the Nth transmission point.
Optionally, the CSI information includes: the method comprises the following steps of carrying out Type I narrowband SP-CSI information by adopting a long PUCCH resource, and carrying out CSI information by adopting a PUSCH resource.
To solve the foregoing technical problem, an embodiment of the present invention provides a CSI reporting apparatus, including: the CSI determining module is suitable for determining CSI information to be reported to the N transmission points, wherein the CSI information comprises N CRI parameter values, N RI parameter values, PMI parameter values of the N transmission points and CQI parameter values of the N transmission points; the discarding module is suitable for sequentially discarding a part of parameter values in the CSI information according to a preset discarding sequence when the bit number of the CSI information is larger than a preset carrying bit number; a reporting module, adapted to report the remaining part of the CSI information to the N transmission points; the N CRI parameter values correspond to the N transmission points one to one, the N RI parameter values correspond to the N transmission points one to one, the PMI parameter values of the N transmission points correspond to the N transmission points one to one, the CQI parameter values of the N transmission points correspond to the N transmission points one to one, and N is greater than or equal to 2.
In order to solve the foregoing technical problems, an embodiment of the present invention provides a storage medium, where a computer instruction is stored, and the computer instruction executes the steps of the CSI reporting method when running.
In order to solve the foregoing technical problem, an embodiment of the present invention provides a user terminal, including a memory and a processor, where the memory stores a computer instruction capable of being executed on the processor, and the processor executes the steps of the CSI reporting method when executing the computer instruction.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, CSI information to be reported to N transmission points is determined, wherein the CSI information comprises N CRI parameter values, N RI parameter values, PMI parameter values of N transmission points and CQI parameter values of N transmission points; if the bit number of the CSI information is larger than a preset bearing bit number, sequentially discarding a part of parameter values in the CSI information according to a preset discarding sequence; reporting the rest part of the CSI information to the N transmission points; the N CRI parameter values correspond to the N transmission points one to one, the N RI parameter values correspond to the N transmission points one to one, the PMI parameter values of the N transmission points correspond to the N transmission points one to one, the CQI parameter values of the N transmission points correspond to the N transmission points one to one, and N is greater than or equal to 2. By adopting the scheme, the CSI information to be reported to the N transmission points is determined, the preset discarding sequence is designed, the parts of the parameter values in the CSI information can be determined to be discarded aiming at the scene of jointly reporting the CSI information in the Multi-TRP, and the CSI information containing the parameter values is reported to the N transmission points.
Further, in the embodiment of the present invention, the PMI parameter values corresponding to each transmission point are sequentially discarded according to the reverse order of the sequence numbers of the N transmission points, so that the discarding rule in the R15 standard can be used to a greater extent, and the adaptation degree is improved.
Further, in the embodiment of the present invention, according to the order of the CQI parameter values in the narrowband CSI information from high to low, the PMI parameter values corresponding to the same transmission points as the CQI parameter values are discarded in sequence; according to the sequence of the CQI parameter values from high to low in the broadband CSI, the PMI parameter values of the transmission points corresponding to the same CQI parameter values are discarded in sequence, the PMI parameter values of the transmission points with better channel quality can be discarded first, so that misjudgment of the network side on the condition of poor channel quality is avoided, and the transmission quality of the network side is improved.
Further, in the embodiment of the present invention, a part of the PMI parameter value and the CQI parameter value is discarded in sequence, and the PMI parameter value of the transmission point with better channel quality may be discarded first, so as to prevent the network side from misjudging the situation with worse channel quality, which is beneficial to improving the transmission quality of the network side; further, when the difference between the bit number of the CSI information and the preset bearer bit number is large, the bearer requirement may be met by discarding a part of the CQI parameter value.
Further, in the embodiment of the present invention, discarding the PMI parameter value, a part of the CQI parameter value, and a part of the RI parameter value in sequence helps to meet the bearer requirement by discarding a part of the RI parameter value after discarding the PMI parameter value and a part of the CQI parameter value when the difference between the bit number of the CSI information and the preset bearer bit number is very large.
Drawings
Fig. 1 is a flowchart of a CSI reporting method in an embodiment of the present invention;
FIG. 2 is a flowchart of one embodiment of step S12 of FIG. 1;
FIG. 3 is a flowchart of another embodiment of step S12 of FIG. 1;
FIG. 4 is a flowchart of yet another embodiment of step S12 of FIG. 1;
fig. 5 is a schematic structural diagram of a CSI reporting apparatus according to an embodiment of the present invention.
Detailed Description
In the prior art, a UE reports CSI to a network side to inform a current channel condition, and discards a part of CSI information when a bit number of the CSI information is greater than a preset carrying bit number.
Specifically, a Type I CSI reporting mode or a Type II CSI reporting mode may be selected. The parameters reported by the Type I CSI may include CRI, RI, PMI, and CQI, where when RI is greater than 4, there may be CQIs of two Transport Blocks (TBs); the parameters reported by the Type II CSI can include RI, CQI, the number of wideband nonzero amplitude coefficients of each layer and PMI.
Referring to table 1, table 1 is a CSI information type table carried by PUCCH resources and PUSCH resources.
TABLE 1
Figure BDA0001924704750000071
The CSI may include periodic CSI (periodic CSI, P-CSI), aperiodic CSI (AP-CSI), and Semi-persistent CSI (Semi-periodic CSI, SP-CSI).
Further, Type I narrowband SP-CSI information carried using long PUCCH resources and CSI information carried using PUSCH resources may include two parts (part), where the first part (part1) has a fixed load, the second part (part2) has a non-fixed load, and part1 is transmitted before part 2.
In a specific implementation, the parameters reported by each part may include:
when Type I CSI reporting is employed, part1 may include CRI, RI, CQI of the first TB (including narrowband CQI), part2 may include CQI, PMI of the second TB;
when Type II CSI reporting is adopted, part1 may include RI, CQI, and the number of wideband non-zero amplitude coefficients per layer, and part2 may include PMI.
In R15, for CSI feedback of Type I, when the role of CSI is CSI measurement, the maximum number of CSI resources is 8, that is, CRI needs 3 bits to indicate. In R15, the maximum number of layers for a base station is also 8, i.e. 3 bits are needed to indicate, the CQI maximum is 4 bits needed to indicate, if the value of RI is greater than 4, there will be CQI for the second TB in part 2. The load size of the corresponding PMI can be known through the CRI and the RI. Therefore, the base station can know the load size of part2 by decoding the CRI and RI information of part 1.
In R15, the CSI of Type II supports 2 layers at maximum, RI needs 1bit to indicate that, when the ports of CSI-RS are 4, L ═ 2 beams will be configured, the number of wideband non-zero amplitude coefficients of each layer is 4 at maximum, if the ports of CSI-RS are greater than 4, L ∈ {2,3,4} will be configured, and the wideband non-zero amplitude coefficients reported by each layer are 2L at maximum, where part2 reports the number of wideband non-zero amplitude coefficients of each layer.
Further, when PUCCH resources cannot carry UCI load, part of the parameters of CSI part2 may be dropped (drop), and for PUSCH resources with TB transmission, if the bit number of CSI part2 in the current UCI exceeds the resource bit number reserved for CSI part2 by PUSCH resources, part of the parameters of CSI part2 may also be dropped, and for PUSCH resources without TB transmission, if the coding rate of CSI part2 exceeds the threshold, part of the information of CSI part2 may also be dropped.
Specifically, in R15, the priority of the CSI report (report) carrying wideband CSI information is the highest, and therefore, in the same CSI information, the priority of the CSI report carrying CSI information of an even subband is greater than that of the CSI report carrying CSI information of an odd subband, and the priorities between CSI reports are sorted from low to high by the ID of the CSI report.
The inventor of the present invention finds, through research, that a CSI feedback in R15 includes a single base station, that is, UCI includes information of the single base station, that is, a solution is provided only for a scenario in which a UE reports to a single transmission Point (TRP), where the CSI information only includes a single CRI parameter value, a single RI parameter value, a single PMI parameter value, and a single CQI parameter value.
However, for the scenario of jointly reporting CSI information in Multi-TRP, the UE may jointly report CSI information of N TRPs at the same time, and there is no CSI information discarding rule set in the prior art, so that the existing discarding rule cannot adapt to the scenario of Multi-TRP in 5G NRR 16.
In the embodiment of the invention, CSI information to be reported to N transmission points is determined, wherein the CSI information comprises N CRI parameter values, N RI parameter values, PMI parameter values of N transmission points and CQI parameter values of N transmission points; if the bit number of the CSI information is larger than a preset bearing bit number, sequentially discarding a part of parameter values in the CSI information according to a preset discarding sequence; reporting the rest part of the CSI information to the N transmission points; the N CRI parameter values correspond to the N transmission points one to one, the N RI parameter values correspond to the N transmission points one to one, the PMI parameter values of the N transmission points correspond to the N transmission points one to one, the CQI parameter values of the N transmission points correspond to the N transmission points one to one, and N is greater than or equal to 2. By adopting the scheme, the CSI information to be reported to the N transmission points is determined, the preset discarding sequence is designed, the parts of the parameter values in the CSI information can be determined to be discarded aiming at the scene of jointly reporting the CSI information in the Multi-TRP, and the CSI information containing the parameter values is reported to the N transmission points.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1, fig. 1 is a flowchart of a CSI reporting method in an embodiment of the present invention. The CSI reporting method may include steps S11 to S13:
step S11: determining CSI information to be reported to N transmission points, wherein the CSI information comprises N CRI parameter values, N RI parameter values, PMI parameter values of N transmission points and CQI parameter values of N transmission points;
step S12: if the bit number of the CSI information is larger than a preset bearing bit number, sequentially discarding a part of parameter values in the CSI information according to a preset discarding sequence;
step S13: and reporting the rest part in the CSI information to the N transmission points.
The N CRI parameter values correspond to the N transmission points one to one, the N RI parameter values correspond to the N transmission points one to one, the PMI parameter values of the N transmission points correspond to the N transmission points one to one, the CQI parameter values of the N transmission points correspond to the N transmission points one to one, and N is greater than or equal to 2.
In the specific implementation of step S11, it can be known that, in the embodiment of the present invention, for a scenario where CSI information is jointly reported by Multi-TRP, a UE may jointly report CSI information of N TRPs at the same time by determining CSI information to be reported to N transmission points, where the CSI information includes N CRI parameter values, N RI parameter values, PMI parameter values of N transmission points, and CQI parameter values of N transmission points.
It should be noted that, among the PMI parameter values of the N transmission points, each transmission point may have more than one PMI parameter value, and when discarding the PMI parameter values, the PMI parameter values may be discarded from transmission point to transmission point in units of transmission points.
Further, the CSI information may include: the method comprises the following steps of carrying out Type I narrowband SP-CSI information by adopting a long PUCCH resource, and carrying out CSI information by adopting a PUSCH resource.
In the embodiment of the present invention, by setting the CSI information as Type I narrowband SP-CSI information carried by using a long PUCCH resource and CSI information carried by using a PUSCH resource, higher adaptability can be provided to the bearer rule specified by R15 in the prior art (see table 1).
In a specific implementation of step S12, when the bit number of the CSI information is greater than a preset bit number of the bearer, a part of the parameter values in the CSI information needs to be discarded.
The preset number of bearer bits may be determined according to specific bearer capabilities and in combination with specific situations.
Specifically, the condition that the bit number of the CSI information is greater than the preset carrying bit number may include one or more of the following: when the PUCCH resource can not carry the UCI load, part of the parameter value of the CSI part2 is discarded; if the code rate of CSIdart 2 exceeds the threshold, a portion of the parameter values of CSI part2 are also discarded. It should be noted that, in the embodiment of the present invention, there is no limitation on a specific occurrence condition that the bit number of the CSI information is greater than a preset carrying bit number.
Further, the N transmission points have preset sequence numbers, and the sequentially discarding a part of the parameter values in the CSI information according to a preset discarding order may include: and if the bit number of the PMI parameter values of the N transmission points subtracted by the bit number of the CSI information is less than or equal to the preset bearing bit number, sequentially discarding the PMI parameter values corresponding to each transmission point according to the reverse order of the serial numbers of the N transmission points until the bit number of the rest part in the CSI information is less than or equal to the preset bearing bit number.
In the embodiment of the present invention, the PMI parameter values corresponding to each transmission point are sequentially discarded according to the reverse order of the sequence numbers of the N transmission points, so that the discarding rule in the R15 standard can be used to a greater extent, and the adaptation degree to the discarding rule in the prior art is improved.
Referring to fig. 2, fig. 2 is a flowchart of an embodiment of step S12 in fig. 1.
The CSI information may include wideband CSI information and narrowband CSI information, and the sequentially discarding a part of parameter values in the CSI information according to a preset discarding order may include: if the bit number of the CSI information minus the bit number of the PMI parameter values of the N transmission points is less than or equal to the preset carrying bit number, sequentially discarding a part of the CSI information according to the following sequence from the step S21 to the step S22 until the bit number of the rest part of the CSI information is less than or equal to the preset carrying bit number.
Step S21: according to the sequence of the CQI parameter values from high to low in the narrow-band CSI information, sequentially discarding the PMI parameter values of the transmission points corresponding to the CQI parameter values;
step S22: and according to the sequence of the CQI parameter values from high to low in the broadband CSI information, sequentially discarding the PMI parameter values corresponding to the same transmission points as the CQI parameter values.
It should be noted that, because the priority of the CSI report carrying wideband CSI information is the highest in R15, in the embodiment of the present invention, the PMI parameter value of the transmission point corresponding to the narrowband CSI information is discarded first, and after all the PMI parameter values are discarded, if the bit number of the remaining part in the CSI information is still greater than the preset bearer bit number, the PMI parameter value of the transmission point corresponding to the wideband CSI information is discarded. By adopting the scheme, the preset discarding sequence can be better adapted to the partial rules in the R15 standard, thereby being beneficial to improving the adaptability with the discarding rules in the prior art.
Further, the CSI information may include an essential reporting part and a selective reporting part, where when a Type ICSI reporting is adopted, the selective reporting part includes PMI parameter values of the N transmission points, and the essential reporting part includes the N CRI parameter values, N RI parameter values, and CQI parameter values of the N transmission points; when Type II CSI reporting is adopted, the selection reporting part comprises PMI parameter values of the N transmission points, and the part needing to be reported comprises the N RI parameter values, CQI parameter values of the N transmission points and the number of the broadband nonzero amplitude coefficients of each layer corresponding to each transmission point.
The portion to be reported may correspond to part1 with a fixed load in R15, and when discarding, the parameter value is not selected from part1 for discarding, that is, the portion to be reported does not include the discarded parameter value.
In the foregoing solution, the discarded PMI parameter values corresponding to each transmission point, that is, the selective reporting section includes PMI parameter values of the N transmission points, the portion that must be reported includes other parameter values, and the portion that must be reported has different parameter values according to whether Type ICSI reporting is employed or Type II CSI reporting is employed.
In the embodiment of the invention, according to the sequence of the CQI parameter values from high to low in the narrow-band CSI information, the PMI parameter values of the transmission points corresponding to the same CQI parameter values are discarded in sequence; according to the sequence of the CQI parameter values from high to low in the broadband CSI, the PMI parameter values of the transmission points corresponding to the same CQI parameter values are discarded in sequence, the PMI parameter values of the transmission points with better channel quality can be discarded first, so that misjudgment of the network side on the condition of poor channel quality is avoided, and the transmission quality of the network side is improved.
In the embodiment of the present invention, by determining CSI information to be reported to N transmission points and designing a preset discarding order, it may be determined which parts of parameter values in the CSI information are discarded for a scenario where CSI information is jointly reported in a Multi-TRP, and then CSI information containing which parameter values is reported to the N transmission points, although the carried CSI information is N times of the original CSI information, compared with a case where CSI information is reported only for a single transmission point scenario in the prior art, by adopting the scheme of the embodiment of the present invention, a scenario of the Multi-TRP in 5G NR 16 may be better adapted.
Further, when Type I CSI reporting is adopted, the reporting order of the parts that must be reported may be: n CRI, N RI, CQI for N transmission points; when Type II CSI reporting is adopted, the reporting sequence of the part that must be reported may be: n RI, CQI of N transmission points and N number of non-zero amplitude coefficients of each layer of broadband.
Referring to fig. 3, fig. 3 is a flowchart of another embodiment of step S12 in fig. 1.
The CSI information comprises wideband CSI information and narrowband CSI information, the N transmission points have preset serial numbers, if the result of subtracting the bit numbers of the PMI parameter values and the N-1 CQI parameter values of the N transmission points from the bit number of the CSI information is less than or equal to the preset carrying bit number, a part of the CSI information is discarded in sequence according to the sequence from the following step S31 to the step S33 until the bit number of the rest part of the CSI information is less than or equal to the preset carrying bit number.
Step S31: according to the sequence of the CQI parameter values from high to low in the narrow-band CSI information, sequentially discarding the PMI parameter values of the transmission points corresponding to the CQI parameter values;
step S32: according to the sequence of CQI parameter values from high to low in the broadband CSI information, sequentially discarding PMI parameter values corresponding to the same transmission points as the CQI parameter values;
step S33: except for the transmission points corresponding to the preset CQI parameter values, the CQI parameter values corresponding to the transmission points are discarded in sequence according to the reverse sequence of the serial numbers of the N-1 transmission points.
In the embodiment of the invention, according to the sequence of the CQI parameter values from high to low in the narrow-band CSI information, the PMI parameter values of the transmission points corresponding to the same CQI parameter values are discarded in sequence; according to the sequence of the CQI parameter values from high to low in the broadband CSI, the PMI parameter values of the transmission points corresponding to the same CQI parameter values are discarded in sequence, and then a part of the PMI parameter values are discarded, so that the PMI parameter values of the transmission points with better channel quality can be discarded first, the misjudgment of the network side on the condition of poorer channel quality is avoided, and the transmission quality of the network side is improved; further, when the difference between the bit number of the CSI information and the preset bearer bit number is large, the bearer requirement may be met by discarding a part of the CQI parameter value.
Further, when Type I CSI reporting is adopted, the preset CQI parameter value may be the smallest one of the CQI parameter values of the N transmission points or a CQI parameter value corresponding to the first transmission point; when Type II CSI reporting is adopted, the preset CQI parameter value may be the smallest one of the CQI parameter values of the N transmission points or a CQI parameter value corresponding to the first transmission point.
In the embodiment of the present invention, the preset CQI parameter value may be set to be the smallest one of the CQI parameter values of the N transmission points, which has an advantage that when the CQI parameter value in the selected reporting part is discarded, a lower error rate may be ensured, thereby ensuring that each TRP can work, and a disadvantage that when the CQI parameter value in the selected reporting part does not need to be discarded, it is difficult for the network side to distinguish which CRI the CQI corresponding to the part that needs to be reported matches, and that additional indication information needs to be added (for example, an indication information may be added to the CQI)
Figure BDA0001924704750000131
To indicate the TRP to which the CQI corresponds).
In the embodiment of the present invention, the preset CQI parameter value may also be set as a CQI parameter value corresponding to the first transmission point, which has the advantage that the network side can know which CRI corresponds to the CQI; the disadvantage is that when the CQI parameter value of the selected reporting part is discarded, the CQI parameter value in the part that must be reported may be large, which results in that some links with poor channel conditions cannot use an unmatched Modulation and Coding Scheme (MCS), thereby affecting the throughput of the whole system.
Further, the CSI information includes an essential reporting part and a selective reporting part; when a Type I CSI report is adopted, the selective reporting part may include PMI parameter values of the N transmission points and the N-1 CQI parameter values, and the mandatory reporting part may include the N CRI parameter values, N RI parameter values, and the preset CQI parameter value; when Type II CSI reporting is adopted, the selective reporting part may include PMI parameter values of the N transmission points and the N-1 CQI parameter values, and the part that must be reported may include the N RI parameter values, the number of wideband nonzero amplitude coefficients of each layer corresponding to each transmission point, and the preset CQI parameter value.
The portion to be reported may correspond to part1 with a fixed load in R15, and when discarding, the parameter value is not selected from part1 for discarding, that is, the portion to be reported does not include the discarded parameter value.
In the foregoing solution, the discarded part is the PMI parameter value and a part of the CQI parameter value corresponding to each transmission point, that is, the selective reporting part includes the PMI parameter values of the N transmission points and the N-1 CQI parameter values, the part that must be reported includes other parameter values, and the part that must be reported has different parameter values according to whether Type I CSI reporting is adopted or Type II CSI reporting is adopted.
Specifically, the load of CSIType I was increased by (5N-6) bits compared to part1 of R15 (1 bit per RI, by (N-1) TRP, by (2N-3) bits per RI, by 3X (N-1) bits for CRI), and by R15 by part1 of CSIType II
Figure BDA0001924704750000141
Figure BDA0001924704750000142
The number of bits (increasing the number of non-zero amplitude coefficients of each layer of broadband and the RI of N-1 TRPs) is more likely to cause the situation that the difference between the number of bits of the CSI information and the preset carrying number of bits is large.
Further, when Type I CSI reporting is adopted, the reporting order of the parts that must be reported may be: the parameter value set from the first transmission point to the parameter value set from the Nth transmission point and the preset CQI parameter value, the parameter value set of the ith transmission point comprises a CRI parameter value and an RI parameter value corresponding to the ith transmission point, and i is a positive integer from 1 to N; when Type II CSI reporting is adopted, the reporting sequence of the part that must be reported may be: the parameter value set from the first transmission point to the parameter value set from the Nth transmission point and the preset CQI parameter value, the parameter value set of the ith transmission point comprises the RI parameter value corresponding to the ith transmission point and the number of the wideband nonzero amplitude coefficients of each layer, and i is a positive integer between 1 and N.
More specifically, when Type I CSI reporting is employed, the mandatory reporting partThe reporting sequence of (a) may be: CRI0、RI0、CRI1、RI1、CRI2、RI2、……CRIn-1、RIn-1Presetting CQI; when Type II CSI reporting is adopted, the reporting sequence of the part that must be reported may be: RI (Ri)0The number of the broadband nonzero amplitude coefficients of each layer corresponding to the first transmission point, and RI1The number of the broadband nonzero amplitude coefficients of each layer corresponding to the second transmission point, and RI2The number of broadband nonzero amplitude coefficients of each layer corresponding to the third transmission point, … … RIn-1The number of the non-zero amplitude coefficients of each layer of the broadband corresponding to the Nth transmission point and the preset CQI.
In the embodiment of the invention, the signaling overhead of an additional notification sequence is reduced by setting the reporting sequence.
It should be noted that the N transmission points have preset sequence numbers, where the sequence numbers may be indicated in a display manner, for example, specific parameter values of the N transmission points, such as ID, address information or other parameters of each transmission point, are directly used; the sequence number may also be indicated in an implicit manner, for example, by using an index value, where the bit number of the index value may be determined according to the number N of transmission points, for example, by using a formula
Figure BDA0001924704750000151
And (4) determining.
Referring to fig. 4, fig. 4 is a flowchart of another embodiment of step S12 in fig. 1.
The CSI information comprises wideband CSI information and narrowband CSI information, the N transmission points have preset serial numbers, and the sequentially discarding of a part of parameter values in the CSI information according to a preset discarding sequence comprises: and if the bit number of the PMI parameter values, the N-1 CQI parameter values and the N-1 RI parameter values of the N transmission points subtracted by the bit number of the CSI information is less than or equal to the preset bearing bit number, sequentially discarding a part of the CSI information according to the sequence from the following step S41 to the step S44 until the bit number of the rest part in the CSI information is less than or equal to the preset bearing bit number.
Step S41: according to the sequence of the CQI parameter values from high to low in the narrow-band CSI information, sequentially discarding the PMI parameter values of the transmission points corresponding to the CQI parameter values;
step S42: according to the sequence of CQI parameter values from high to low in the broadband CSI information, sequentially discarding PMI parameter values corresponding to the same transmission points as the CQI parameter values;
step S43: except for the transmission points corresponding to the preset CQI parameter values, sequentially discarding the CQI parameter values corresponding to the transmission points according to the reverse sequence of the serial numbers of the N-1 transmission points;
step S44: except the first transmission point, sequentially discarding the RI parameter values corresponding to the transmission points according to the reverse order of the sequence numbers of the N-1 transmission points.
In the embodiment of the present invention, discarding the PMI parameter value, a part of the CQI parameter value, and a part of the RI parameter value in sequence helps to meet the bearer requirement by discarding a part of the RI parameter value after discarding the PMI parameter value and a part of the CQI parameter value when the difference between the bit number of the CSI information and the preset bearer bit number is very large.
Further, when Type I CSI reporting is adopted, the preset CQI parameter value is the smallest one of the CQI parameter values of the N transmission points or a CQI parameter value corresponding to the first transmission point; when Type II CSI reporting is adopted, the preset CQI parameter value is the minimum CQI parameter value of the CQI parameter values of the N transmission points or the CQI parameter value corresponding to the first transmission point.
In the embodiment of the present invention, the preset CQI parameter value may be set to be the smallest one of the CQI parameter values of the N transmission points, which has an advantage that when the CQI parameter value in the selected reporting part is discarded, a lower error rate may be ensured, thereby ensuring that each TRP can work, and a disadvantage that when the CQI parameter value in the selected reporting part does not need to be discarded, it is difficult for the network side to distinguish which CRI the CQI corresponding to the part that needs to be reported matches, and that additional indication information needs to be added (for example, an indication information may be added to the CQI)
Figure BDA0001924704750000161
To indicate the TRP to which the CQI corresponds).
In the embodiment of the present invention, the preset CQI parameter value may also be a CQI parameter value corresponding to the first transmission point, which has the advantage that the network side can know which CRI corresponds to the CQI; the disadvantage is that when the CQI parameter value of the selected reporting part is discarded, the CQI parameter value of the part that must be reported may be large, which results in that some links with poor channel conditions cannot use unmatched modulation and coding strategies, thereby affecting the throughput of the whole system.
Further, the CSI information includes an essential reporting part and a selective reporting part; when Type I CSI is adopted for reporting, the selective reporting part comprises PMI parameter values of the N transmission points, the N-1 CQI parameter values and the N-1 RI parameter values, and the part needing to be reported comprises the N CRI parameter values, the RI parameter value corresponding to the first transmission point and the preset CQI parameter value; when Type II CSI reporting is adopted, the selection reporting part comprises PMI parameter values of the N transmission points, the N-1 CQI parameter values and the N-1 RI parameter values, and the part needing to be reported comprises the RI parameter value corresponding to the first transmission point, the number of the nonzero amplitude coefficient of each layer of the broadband corresponding to each transmission point and the preset CQI parameter value.
The portion to be reported may correspond to part1 with a fixed load in R15, and when discarding, the parameter value is not selected from part1 for discarding, that is, the portion to be reported does not include the discarded parameter value.
In the foregoing solution, the discarded is the PMI parameter value, a part of the CQI parameter value, and a part of the RI parameter value corresponding to each transmission point, that is, the selection reporting part includes the RI parameter value, the part that needs to be reported includes other parameter values, and the part that needs to be reported has different parameter values according to whether Type I CSI reporting is adopted or Type II CSI reporting is adopted.
Specifically, the load of CSIType I is increased compared with part1 of R15 (3)N-4) bit (RI decreased by 1bit, CRI increased by 3X (N-1) bit), CSIType II load increased than part1 of R15
Figure BDA0001924704750000171
One bit (each TRP per layer increased
Figure BDA0001924704750000172
The number of (N-1) TRPs is increased, and at most, the number of corresponding layers is two, so that the situation that the difference between the bit number of the CSI information and the preset carrying bit number is large is more likely to occur.
Further, when Type I CSI reporting is adopted, the reporting order of the parts that must be reported may be: the CRI parameter value corresponding to the first transmission point, the RI parameter value corresponding to the first transmission point, the CRI parameter value corresponding to the second transmission point to the Nth transmission point and the preset CQI parameter value; when Type II CSI reporting is adopted, the reporting sequence of the part that must be reported may be: the RI parameter value corresponding to the first transmission point, the number of the broadband nonzero amplitude coefficients of each layer corresponding to the first transmission point, the preset CQI parameter value and the number of the broadband nonzero amplitude coefficients of each layer corresponding to the second transmission point to the Nth transmission point.
More specifically, when Type I CSI reporting is adopted, the reporting order of the parts that must be reported may be: CRI0、RI0、CRI1、CRI2、CRI3、……CRIn-1Presetting CQI; when Type II CSI reporting is adopted, the reporting sequence of the part that must be reported may be: RI (Ri)0The number of the wideband nonzero amplitude coefficients of each layer corresponding to the first transmission point, the preset CQI, the number of the wideband nonzero amplitude coefficients of each layer corresponding to the second transmission point, the number of the wideband nonzero amplitude coefficients of each layer corresponding to the third transmission point and the number of the wideband nonzero amplitude coefficients of each layer corresponding to the Nth transmission point of … ….
In the embodiment of the invention, the signaling overhead of an additional notification sequence is reduced by setting the reporting sequence.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a CSI reporting apparatus in an embodiment of the present invention. The CSI reporting apparatus may include a CSI determining module 51, a discarding module 52, and a reporting module 53.
The CSI determining module 51 is adapted to determine CSI information to be reported to the N transmission points, where the CSI information includes N CRI parameter values, N RI parameter values, PMI parameter values of the N transmission points, and CQI parameter values of the N transmission points; the discarding module 52 is adapted to sequentially discard a part of the parameter values in the CSI information according to a preset discarding order when the bit number of the CSI information is greater than a preset carrying bit number; the reporting module 53 is adapted to report the remaining part of the CSI information to the N transmission points; the N CRI parameter values correspond to the N transmission points one to one, the N RI parameter values correspond to the N transmission points one to one, the PMI parameter values of the N transmission points correspond to the N transmission points one to one, the CQI parameter values of the N transmission points correspond to the N transmission points one to one, and N is greater than or equal to 2.
In the embodiment of the invention, by determining the CSI information to be reported to the N transmission points and designing the preset discarding sequence, which parts of the parameter values in the CSI information are discarded can be determined for a scene in which the CSI information is jointly reported in the Multi-TRP, and then the CSI information containing which parameter values is reported to the N transmission points.
For the principle, specific implementation and beneficial effects of the CSI reporting apparatus, please refer to the foregoing and the related descriptions about the CSI reporting method shown in fig. 1 to fig. 4, which are not described herein again.
The embodiment of the present invention further provides a storage medium, where computer instructions are stored, and the computer instructions execute the steps of the CSI reporting method shown in fig. 1 to 4 when running. The storage medium may be a computer-readable storage medium, and may include, for example, a non-volatile (non-volatile) or non-transitory (non-transitory) memory, and may further include an optical disc, a mechanical hard disk, a solid state hard disk, and the like.
The embodiment of the present invention further provides a user terminal, which includes a memory and a processor, where the memory stores a computer instruction capable of running on the processor, and the processor executes the steps of the CSI reporting method shown in fig. 1 to 4 when running the computer instruction. The user terminal includes, but is not limited to, a mobile phone, a computer, a tablet computer and other terminal devices.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (16)

1. A CSI reporting method is characterized by comprising the following steps:
determining CSI information to be reported to N transmission points, wherein the CSI information comprises N CRI parameter values, N RI parameter values, PMI parameter values of N transmission points and CQI parameter values of N transmission points;
if the bit number of the CSI information is larger than a preset bearing bit number, sequentially discarding a part of parameter values in the CSI information according to a preset discarding sequence;
reporting the rest part of the CSI information to the N transmission points;
the N CRI parameter values correspond to the N transmission points one to one, the N RI parameter values correspond to the N transmission points one to one, the PMI parameter values of the N transmission points correspond to the N transmission points one to one, the CQI parameter values of the N transmission points correspond to the N transmission points one to one, and N is greater than or equal to 2.
2. The CSI reporting method of claim 1, wherein the N transmission points have preset sequence numbers, and the sequentially discarding a part of the parameter values in the CSI information according to a preset discarding order comprises:
and if the bit number of the PMI parameter values of the N transmission points subtracted by the bit number of the CSI information is less than or equal to the preset bearing bit number, sequentially discarding the PMI parameter values corresponding to each transmission point according to the reverse order of the serial numbers of the N transmission points until the bit number of the rest part in the CSI information is less than or equal to the preset bearing bit number.
3. The CSI reporting method of claim 1, wherein the CSI information comprises wideband CSI information and narrowband CSI information, and the sequentially discarding a part of parameter values in the CSI information according to a preset discarding order comprises:
if the result of subtracting the bit number of the PMI parameter values of the N transmission points from the bit number of the CSI information is less than or equal to the preset bearing bit number, sequentially discarding a part of the CSI information according to the following sequence until the bit number of the rest part in the CSI information is less than or equal to the preset bearing bit number:
according to the sequence of the CQI parameter values from high to low in the narrow-band CSI information, sequentially discarding the PMI parameter values of the transmission points corresponding to the CQI parameter values;
and according to the sequence of the CQI parameter values from high to low in the broadband CSI information, sequentially discarding the PMI parameter values corresponding to the same transmission points as the CQI parameter values.
4. The CSI reporting method according to claim 2 or 3, wherein the CSI information includes a required reporting part and a selected reporting part;
when reporting by adopting Type I CSI, the selective reporting part comprises PMI parameter values of the N transmission points, and the part needing to be reported comprises the N CRI parameter values, the N RI parameter values and CQI parameter values of the N transmission points;
when Type II CSI reporting is adopted, the selection reporting part comprises PMI parameter values of the N transmission points, and the part needing to be reported comprises the N RI parameter values, CQI parameter values of the N transmission points and the number of the broadband nonzero amplitude coefficients of each layer corresponding to each transmission point.
5. The CSI reporting method of claim 1, wherein the CSI information comprises wideband CSI information and narrowband CSI information, the N transmission points have preset sequence numbers, and the sequentially discarding a part of parameter values in the CSI information according to a preset discarding order comprises:
if the result of subtracting the PMI parameter values of the N transmission points and the bit numbers of the N-1 CQI parameter values from the bit number of the CSI information is less than or equal to the preset bearing bit number, sequentially discarding a part of the CSI information according to the following sequence until the bit number of the rest part in the CSI information is less than or equal to the preset bearing bit number:
according to the sequence of the CQI parameter values from high to low in the narrow-band CSI information, sequentially discarding the PMI parameter values of the transmission points corresponding to the CQI parameter values;
according to the sequence of CQI parameter values from high to low in the broadband CSI information, sequentially discarding PMI parameter values corresponding to the same transmission points as the CQI parameter values;
except for the transmission points corresponding to the preset CQI parameter values, the CQI parameter values corresponding to the transmission points are discarded in sequence according to the reverse sequence of the serial numbers of the N-1 transmission points.
6. The CSI reporting method of claim 5,
when Type I CSI reporting is adopted, the preset CQI parameter value is the minimum CQI parameter value in the CQI parameter values of the N transmission points or the CQI parameter value corresponding to the first transmission point;
when Type II CSI reporting is adopted, the preset CQI parameter value is the minimum CQI parameter value of the CQI parameter values of the N transmission points or the CQI parameter value corresponding to the first transmission point.
7. The CSI reporting method according to claim 5, wherein the CSI information includes a required reporting part and a selected reporting part;
when Type I CSI is adopted for reporting, the selective reporting part comprises PMI parameter values of the N transmission points and the N-1 CQI parameter values, and the part which needs to be reported comprises the N CRI parameter values, the N RI parameter values and the preset CQI parameter values;
when Type II CSI reporting is adopted, the selection reporting part comprises PMI parameter values of the N transmission points and the N-1 CQI parameter values, and the part which needs to be reported comprises the N RI parameter values, the number of the nonzero amplitude coefficients of each layer of the broadband corresponding to each transmission point and the preset CQI parameter value.
8. The CSI reporting method of claim 7,
when the Type I CSI is adopted for reporting, the reporting sequence of the part which needs to be reported is as follows:
the parameter value set from the first transmission point to the parameter value set from the Nth transmission point and the preset CQI parameter value, the parameter value set of the ith transmission point comprises a CRI parameter value and an RI parameter value corresponding to the ith transmission point, and i is a positive integer from 1 to N;
when the Type II CSI is adopted for reporting, the reporting sequence of the part which needs to be reported is as follows:
the parameter value set from the first transmission point to the parameter value set from the Nth transmission point and the preset CQI parameter value, the parameter value set of the ith transmission point comprises the RI parameter value corresponding to the ith transmission point and the number of the wideband nonzero amplitude coefficients of each layer, and i is a positive integer between 1 and N.
9. The CSI reporting method of claim 1, wherein the CSI information comprises wideband CSI information and narrowband CSI information, the N transmission points have preset sequence numbers, and the sequentially discarding a part of parameter values in the CSI information according to a preset discarding order comprises:
if the bit number of the CSI information minus the bit numbers of the PMI parameter values, the N-1 CQI parameter values and the N-1 RI parameter values of the N transmission points is less than or equal to the preset bearing bit number, sequentially discarding a part of the CSI information according to the following sequence until the bit number of the rest part in the CSI information is less than or equal to the preset bearing bit number:
according to the sequence of the CQI parameter values from high to low in the narrow-band CSI information, sequentially discarding the PMI parameter values of the transmission points corresponding to the CQI parameter values;
according to the sequence of CQI parameter values from high to low in the broadband CSI information, sequentially discarding PMI parameter values corresponding to the same transmission points as the CQI parameter values;
except for the transmission points corresponding to the preset CQI parameter values, sequentially discarding the CQI parameter values corresponding to the transmission points according to the reverse sequence of the serial numbers of the N-1 transmission points;
except the first transmission point, sequentially discarding the RI parameter values corresponding to the transmission points according to the reverse order of the sequence numbers of the N-1 transmission points.
10. The CSI reporting method of claim 9, wherein,
when Type I CSI reporting is adopted, the preset CQI parameter value is the minimum CQI parameter value in the CQI parameter values of the N transmission points or the CQI parameter value corresponding to the first transmission point;
when Type II CSI reporting is adopted, the preset CQI parameter value is the minimum CQI parameter value of the CQI parameter values of the N transmission points or the CQI parameter value corresponding to the first transmission point.
11. The CSI reporting method of claim 9, wherein the CSI information comprises a required reporting part and a selected reporting part;
when Type I CSI is adopted for reporting, the selective reporting part comprises PMI parameter values of the N transmission points, the N-1 CQI parameter values and the N-1 RI parameter values, and the part needing to be reported comprises the N CRI parameter values, the RI parameter value corresponding to the first transmission point and the preset CQI parameter value;
when Type II CSI reporting is adopted, the selection reporting part comprises PMI parameter values of the N transmission points, the N-1 CQI parameter values and the N-1 RI parameter values, and the part needing to be reported comprises the RI parameter value corresponding to the first transmission point, the number of the nonzero amplitude coefficient of each layer of the broadband corresponding to each transmission point and the preset CQI parameter value.
12. The CSI reporting method of claim 11,
when the Type I CSI is adopted for reporting, the reporting sequence of the part which needs to be reported is as follows:
the CRI parameter value corresponding to the first transmission point, the RI parameter value corresponding to the first transmission point, the CRI parameter value corresponding to the second transmission point to the Nth transmission point and the preset CQI parameter value;
when the Type II CSI is adopted for reporting, the reporting sequence of the part which needs to be reported is as follows:
the RI parameter value corresponding to the first transmission point, the number of the broadband nonzero amplitude coefficients of each layer corresponding to the first transmission point, the preset CQI parameter value and the number of the broadband nonzero amplitude coefficients of each layer corresponding to the second transmission point to the Nth transmission point.
13. The CSI reporting method of claim 1, wherein the CSI information comprises: the method comprises the following steps of carrying out Type I narrowband SP-CSI information by adopting a long PUCCH resource, and carrying out CSI information by adopting a PUSCH resource.
14. A CSI reporting apparatus, comprising:
the CSI determining module is suitable for determining CSI information to be reported to the N transmission points, wherein the CSI information comprises N CRI parameter values, N RI parameter values, PMI parameter values of the N transmission points and CQI parameter values of the N transmission points;
the discarding module is suitable for sequentially discarding a part of parameter values in the CSI information according to a preset discarding sequence when the bit number of the CSI information is larger than a preset carrying bit number;
a reporting module, adapted to report the remaining part of the CSI information to the N transmission points;
the N CRI parameter values correspond to the N transmission points one to one, the N RI parameter values correspond to the N transmission points one to one, the PMI parameter values of the N transmission points correspond to the N transmission points one to one, the CQI parameter values of the N transmission points correspond to the N transmission points one to one, and N is greater than or equal to 2.
15. A storage medium having stored thereon computer instructions, wherein the computer instructions are operable to perform the steps of the CSI reporting method according to any one of claims 1 to 13.
16. A user terminal comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor executes the computer instructions to perform the steps of the CSI reporting method according to any one of claims 1 to 13.
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