Channel information feedback method and communication apparatus
This application describes a channel information feedback method and a communication apparatus. The method includes a terminal device that receives configuration information sent by a network device, where the configuration information is used to configure a feedback mode of channel information. The terminal device may feed back current channel information to the network device when the feedback mode configured by using the configuration information is a first mode. The terminal device may alternatively feeds back predicted channel information to the network device when the feedback mode configured by using the configuration information is a second mode. System performance is therefore improved by the method described in this application because channel information feedback requirements in different scenarios can be met. In particular, a problem that data transmission performance deteriorates because channel information expires in a moving scenario can be resolved by feeding back the predicted channel information.
1 . A channel information feedback method, comprising:
transmitting, by a communication apparatus, first configuration information, wherein the first configuration information is used to configure a first feedback mode indicating that first to-be-fed-back information is a predicted PMI; and
receiving, by the communication apparatus, the predicted PMI, wherein the predicted PMI is related to a time offset T, window duration, and a time domain feedback granularity, wherein the time offset T is a period of time starting from a slot for channel information feedback, the time domain feedback granularity is N slots, and the window duration is Q*N slots, the Q*N slots are associated with predicted channel matrices used for determining the predicted PMI, wherein N and Q are integers.
2 . The method according to claim 1 , wherein the method further comprises:
transmitting, by the communication apparatus, second configuration information, wherein the second configuration information is used to configure a second feedback mode indicating that second to-be-fed-back information is a current PMI.
3 . The method according to claim 1 , wherein the first configuration information is further used to configure the time offset T.
4 . The method according to claim 1 , wherein the receiving, by the communication apparatus, the predicted PMI comprises:
receiving, by the communication apparatus, PMI obtained through processing of a codebook that is based on a time domain dimension, and the PMI obtained through processing of the codebook represents predicted channel information.
5 . A communication apparatus, comprising:
at least one processor; and
one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor causing the communication apparatus to perform operations comprising:
transmitting first configuration information, wherein the first configuration information is used to configure a first feedback mode indicating that first to-be-fed-back information is a predicted PMI, and
receiving the predicted PMI, wherein the predicted PMI is related to a time offset T, window duration, and a time domain feedback granularity, wherein the time offset T is a period of time starting from a slot for channel information feedback, the time domain feedback granularity is N slots, and the window duration is Q*N slots, the Q*N slots are associated with predicted channel matrices used for determining the predicted PMI, wherein N and Q are integers.
6 . The communication apparatus according to claim 5 , wherein the communications apparatus is further caused to perform operations, comprising:
transmitting second configuration information, wherein the second configuration information is used to configure a second feedback mode indicating that second to-be-fed-back information is a current PMI.
7 . The communication apparatus according to claim 5 , wherein the first configuration information is further used to configure the time offset T.
8 . The communication apparatus according to claim 5 , wherein the operation for receiving the predicted PMI comprises operation for:
receiving PMI obtained through processing of a codebook that is based on a time domain dimension, and the PMI obtained through processing of the codebook represents predicted channel information.
9 . A non-transitory computer-readable storage medium, wherein the computer-readable storage medium stores a program or instructions for being executed by at least one processor of a communications apparatus, and causes the communications apparatus to perform operations comprising:
transmitting first configuration information, wherein the first configuration information is used to configure a first feedback mode indicating that first to-be-fed-back information is a predicted PMI; and
receiving the predicted PMI, wherein the predicted PMI is related to a time offset T, window duration, and a time domain feedback granularity, wherein the time offset T is a period of time starting from a slot for channel information feedback, the time domain feedback granularity is N slots, and the window duration is Q*N slots, the Q*N slots are associated with predicted channel matrices used for determining the predicted PMI, wherein N and Q are integers.
10 . The non-transitory computer-readable storage medium according to claim 9 , wherein the communications apparatus is further caused to perform operations, comprising:
transmitting second configuration information, wherein the second configuration information is used to configure a second feedback mode indicating that second to-be-fed-back information is a current PMI.
11 . The non-transitory computer-readable storage medium according to claim 9 , wherein the first configuration information is further used to configure the time offset T.
12 . The non-transitory computer-readable storage medium according to claim 9 , wherein the communications apparatus caused to perform the operation for receiving the predicted PMI comprises the communications apparatus further caused to perform operations for:
receiving PMI obtained through processing of a codebook that is based on a time domain dimension, and the PMI obtained through processing of the codebook represents predicted channel information.