Method and apparatus for reporting channel state information (CSI) based on physical uplink shared channel (PUSCH)
A method and apparatus for reporting channel state information (CSI) based on a physical uplink shared channel (PUSCH) are used to realize correct reporting of the CSI based on double code books. The method includes the following steps: a reporting mode configuration signaling for the CSI sent from a network side is received, and said reporting mode configuration signaling for the CSI at least carries a designated reporting mode identifier; a first CSI aiming at the whole bandwidth of a system is established according to a reporting type corresponding to said reporting mode identifier; the whole bandwidth of the system is divided into at least two frequency band subclasses, and a second CSI aiming at a designated frequency band subclass is established according to the reporting type corresponding to said reporting mode identifier; and when a reporting indication signaling sent from the network side is received, said first CSI and said second CSI are transmitted to the network side. Therefore, when a user equipment (UE) reports the CSI, a long-term/wideband CSI and a short-term/frequency selective CSI could be considered comprehensively, then a two-level feedback mechanism based on the PUSCH double code books is realized.
1. A method for reporting channel state information on a physical uplink shared channel, comprising:
receiving Channel State Information, CSI, reporting mode configuration signaling transmitted from a network side, wherein the CSI reporting mode configuration signaling carries at least a specified reporting mode identifier;
creating first CSI for entire bandwidth of a system according to a report type corresponding to the reporting mode identifier, dividing the entire bandwidth of the system into at least two subsets of bands and creating second CSI for a specified subset of bands among divided-into subsets of bands according to the report type corresponding to the reporting mode identifier; and
transmitting the first CSI and the second CSI to the network side upon reception of report instruction signaling transmitted from the network side,
wherein the first CSI and the second CSI respectively comprises at least one of a Rank Indicator, RI, a Pre-coding Matrix Indicator, PMI, or Channel Quality Information, CQI,
wherein the first CSI is created and the second CSI is created by:
obtaining a first PMI for the entire bandwidth of the system according to a channel characteristic of the entire bandwidth of the system;
obtaining a second PMI for each of the subsets of bands according to a channel characteristic of the subset of bands; and
obtaining first CQI of each codeword over the entire bandwidth of the system according to a downlink channel characteristic and the first PMI and second PMI:
or
obtaining a first PMI for the entire bandwidth of the system according to a channel characteristic of the entire bandwidth of the system and a local receiving algorithm;
obtaining a second PMI for a part of the subsets of bands according to channel characteristics of the part of the subsets of bands and the local receiving algorithm;
obtaining first CQI of each codeword over the entire bandwidth of the system according to a downlink channel characteristic and the first PMI; and
obtaining second CQI of each codeword over the part of the subsets of bands according to the downlink channel characteristic and the first PMI and second PMI;
or
obtaining a first PMI for the entire bandwidth of the system according to a channel characteristic of the entire bandwidth of the system and a local receiving algorithm;
obtaining a second PMI for each of the subsets of bands according to a channel characteristic of the subset of bands and the local receiving algorithm;
obtaining first CQI of each codeword over the entire bandwidth of the system according to a downlink channel characteristic and the first PMI and second PMI; and
obtaining second CQI of each codeword over the each of the subsets of bands according to the downlink channel characteristic and the first PMI and second PMI.
2. The method according to claim 1 , wherein the subsets of bands comprise at least two Physical Resource Blocks, PRBs, at least two sub-bands or at least two bandwidth parts.
3. An apparatus for reporting channel state information on a physical uplink shared channel, comprising:
a first communicating unit configured to receive Channel State Information, CSI, reporting mode configuration signaling transmitted from a network side, wherein the CSI reporting mode configuration signaling carries at least a specified reporting mode identifier;
a processing unit configured to create first CSI for entire bandwidth of a system according to a report type corresponding to the reporting mode identifier, to divide the entire bandwidth of the system into at least two subsets of bands and to create second CSI for a specified subset of bands among divided-into subsets of bands according to the report type corresponding to the reporting mode identifier; and
a second communicating unit configured to transmit the first CSI and the second CSI to the network side upon reception of report instruction signaling transmitted from the network side,
wherein the processing unit is configured:
to create the first CSI for the entire bandwidth of the system according to the report type corresponding to the reporting mode identifier and to create the second CSI for the specified subset of bands according to the report type corresponding to the reporting mode identifier by obtaining a first Pre-coding Matrix Indicator, PMI, for the entire bandwidth of the system according to a channel characteristic of the entire bandwidth of the system, obtaining a second PMI for each of the subsets of bands according to a channel characteristic of the subset of bands and a local receiving algorithm and obtaining first Channel Quality Information, CQI, of each codeword over the entire bandwidth of the system according to a downlink channel characteristic and the first PMI and second PMI; or
to create the first CSI for the entire bandwidth of the system according to the report type corresponding to the reporting mode identifier and to create the second CSI for the specified subset of bands according to the report type corresponding to the reporting mode identifier by obtaining a first Pre-coding Matrix Indicator, PMI, for the entire bandwidth of the system according to a channel characteristic of the entire bandwidth of the system and a local receiving algorithm, obtaining a second PMI for a part of the subsets of bands according to channel characteristics of the part of the subsets of bands, obtaining first Channel Quality Information, CQI, of each codeword over the entire bandwidth of the system according to a downlink channel characteristic and the first PMI and obtaining second CQI of each codeword over the part of the subsets of bands according to the downlink channel characteristic and the first PMI and second PMI; or
to create the first CSI for the entire bandwidth of the system according to the report type corresponding to the reporting mode identifier and to create the second CSI for the specified subset of bands according to the report type corresponding to the reporting mode identifier by obtaining a first Pre-coding Matrix Indicator, PMI, for the entire bandwidth of the system according to a channel characteristic of the entire bandwidth of the system, obtaining a second PMI for each of the subsets of bands according to a channel characteristic of the subset of bands, obtaining first Channel Quality Information, CQI, of each codeword over the entire bandwidth of the system according to a downlink channel characteristic and the first PMI and second PMI and obtaining second CQI of each codeword over the each of the subsets of bands according to the downlink channel characteristic and the first PMI and second PMI.
4. A user equipment, comprising an apparatus for reporting channel state information on a physical uplink shared channel, the apparatus comprising:
a first communicating unit configured to receive Channel State Information, CSI, reporting mode configuration signaling transmitted from a network side, wherein the CSI reporting mode configuration signaling carries at least a specified reporting mode identifier;
a processing unit configured to create first CSI for entire bandwidth of a system according to a report type corresponding to the reporting mode identifier, to divide the entire bandwidth of the system into at least two subsets of bands and to create second CSI for a specified subset of bands among divided-into subsets of bands according to the report type corresponding to the reporting mode identifier; and
a second communicating unit configured to transmit the first CSI and the second CSI to the network side upon reception of report instruction signaling transmitted from the network side,
wherein the processing unit is configured:
to create the first CSI for the entire bandwidth of the system according to the report type corresponding to the reporting mode identifier and to create the second CSI for the specified subset of bands according to the report type corresponding to the reporting mode identifier by obtaining a first Pre-coding Matrix Indicator, PMI, for the entire bandwidth of the system according to a channel characteristic of the entire bandwidth of the system, obtaining a second PMI for each of the subsets of bands according to a channel characteristic of the subset of bands and a local receiving algorithm and obtaining first Channel Quality Information, CQI, of each codeword over the entire bandwidth of the system according to a downlink channel characteristic and the first PMI and second PMI; or
to create the first CSI for the entire bandwidth of the system according to the report type corresponding to the reporting mode identifier and to create the second CSI for the specified subset of bands according to the report type corresponding to the reporting mode identifier by obtaining a first Pre-coding Matrix Indicator, PMI, for the entire bandwidth of the system according to a channel characteristic of the entire bandwidth of the system and a local receiving algorithm, obtaining a second PMI for a part of the subsets of bands according to channel characteristics of the part of the subsets of bands, obtaining first Channel Quality Information, CQI, of each codeword over the entire bandwidth of the system according to a downlink channel characteristic and the first PMI and obtaining second CQI of each codeword over the part of the subsets of bands according to the downlink channel characteristic and the first PMI and second PMI; or
to create the first CSI for the entire bandwidth of the system according to the report type corresponding to the reporting mode identifier and to create the second CSI for the specified subset of bands according to the report type corresponding to the reporting mode identifier by obtaining a first Pre-coding Matrix Indicator, PMI, for the entire bandwidth of the system according to a channel characteristic of the entire bandwidth of the system, obtaining a second PMI for each of the subsets of bands according to a channel characteristic of the subset of bands, obtaining first Channel Quality Information, CQI, of each codeword over the entire bandwidth of the system according to a downlink channel characteristic and the first PMI and second PMI and obtaining second CQI of each codeword over the each of the subsets of bands according to the downlink channel characteristic and the first PMI and second PMI.