Channel status information feedback and control method and device

• US 10,461,832 B2
• Filed: 07/19/2016
• Issued: 10/29/2019
• Est. Priority Date: 07/20/2015
• Status: Active Grant

• Current Assignee: Datang Mobile Communications Equipment Company Limited (China Information Communication Technology Group Co. Ltd.)
• Original Assignee: China Academy of Telecom Technology (China Information Communication Technology Group Co. Ltd.)
• Inventors: Chen, Wenhong, Gao, Qiubin, Li, Hui, Rakesh, Tamrakar, Chen, Runhua
• Primary Examiner(s): Phan, Man U
• Application Number:
  US15/745,122
• Publication Number:
  US 20180205439A1
• Time in Patent Office: 1,197 Days
• Field of Search: 370252, 370329
• CPC Class Codes: H04B 7/04 using two or more spaced independent antennas
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/0643 Feedback on request
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network

Abstract

Disclosed are a channel status information (CSI) feedback and control method and device. The method comprises: a terminal receives trigger signaling sent by a base station, the trigger signaling being used for instructing the terminal to report CSI obtained within a specified measurement window; and the terminal reports the CSI that is measured by the terminal within the specified measurement window to the base station. Because a terminal reports only CSI that is measured by the terminal within a specified measurement window, the frequency of feeding back CSI by the terminal is reduced, and CSI feedback overheads are also reduced.

Claims

1. A method for feeding back channel state information, the method comprising:

receiving, by a user equipment, a trigger signaling transmitted by a base station, wherein the trigger signaling is configured to indicate the user equipment to report Channel State Information (CSI) obtained in a specified measurement window; and

reporting, by the user equipment, the CSI measured by the user equipment in the measurement window to the base station;

wherein reporting, by the user equipment, the CSI measured in the measurement window to the base station comprises;

reporting, by the user equipment, CSI measured by the user equipment in a first measurement window to the base station after M sub-frames elapse since the trigger signaling is received, wherein the first measurement window is a measurement window before the trigger signaling is received and closest to a sub-frame in which the trigger signaling is received, and M is an integer more than or equal to 0;

or

reporting, by the user equipment, CSI measured by the user equipment in a second measurement window to the base station after M sub-frames elapse following the end of the second measurement window, wherein the second measurement window is a specified measurement window after the trigger signaling is received and closest to a sub-frame in which the trigger signaling is received, and M is an integer more than or equal to 0;

or

reporting, by the user equipment, CSI measured by the user equipment in a second measurement window to the base station after M sub-frames elapse since the trigger signaling is received, wherein the second measurement window is a specified measurement window after the trigger signaling is received and closest to a sub-frame in which the trigger signaling is received, and M is an integer more than or equal to 0.

2. The method according to claim 1, wherein the length of the measurement window is predefined;

or

the length of the measurement window is informed by the base station to the user equipment via higher-layer signaling;

or

the trigger signaling comprises information about the length of the measurement window, wherein the information about the length of the measurement window is the length of the measurement window, or is indication information indicating that the length of the measurement window is a predefined fixed length or a length indicated in higher-layer signaling.

3. The method according to claim 2, wherein the length of the measurement window is the number of sub-frames for CSI measurement in the measurement window;

or the length of the measurement window is the number of consecutive sub-frames in the measurement window;

wherein the number of consecutive sub-frames in the measurement window is a value less than or equal to N, wherein N is the number of consecutive sub-frames between a sub-frame in which the user equipment receives the trigger signaling and a sub-frame in which the user equipment reports the CSI.

4. The method according to claim 1, wherein the user equipment reports the CSI measured in the first measurement window to the base station over the latest Physical Uplink Control Channel (PUCCH) resource after M sub-frames elapse since the trigger signaling is received;

or

the user equipment reports the CSI measured in the first measurement window to the base station over a Physical Uplink Shared Channel (PUSCH) resource in the M-th sub-frame after the trigger signaling is received.

5. The method according to claim 1, wherein the user equipment reports the CSI measured by the user equipment in the second measurement window to the base station over the latest PUCCH resource after M sub-frames elapse following the end of the second measurement window;

or

the user equipment reports the CSI measured by the user equipment in the second measurement window to the base station over a PUSCH resource in the M-th sub-frame following the end of the second measurement window;

or

the user equipment reports the CSI measured by the user equipment in the second measurement window to the base station over the latest PUCCH resource after M sub-frames elapse since the trigger signaling is received;

or

the user equipment reports the CSI measured by the user equipment in the second measurement window to the base station over a PUSCH resource in the M-th sub-frame after the trigger signaling is received.

6. The method according to claim 1, wherein the trigger signaling comprises configuration information indicating downlink reference signals corresponding to CSI measurement by the user equipment, or indication information of a set of configuration information of downlink reference signals corresponding to CSI measurement by the user equipment.

7. A method for controlling feedback of channel state information, the method comprising:

transmitting, by a base station, a trigger signaling to a user equipment to indicate the user equipment to report Chanel State Information (CSI) measured in a specified measurement window; and

receiving, by the base station, the CSI, reported by the user equipment, measured in the measurement window;

wherein receiving, by the base station, the CSI, reported by the user equipment, measured in the measurement window comprises;

receiving, by the base station, CSI, reported by the user equipment, measured in a first measurement window after M sub-frames elapse since the trigger signaling is transmitted, wherein the first measurement window is a specified measurement window before the trigger signaling is transmitted and closest to a sub-frame in which the trigger signaling is transmitted, and M is an integer more than or equal to 0;

or

receiving, by the base station, CSI, reported by the user equipment, measured in a second measurement window after M sub-frames elapse following the end of the second measurement window, wherein the second measurement window is a specified measurement window after the trigger signaling is transmitted and closest to a sub-frame in which the trigger signaling is transmitted, and M is an integer more than or equal to 0;

or

receiving, by the base station, CSI, reported by the user equipment, measured in a second measurement window after M sub-frames elapse since the trigger signaling is transmitted, wherein the second measurement window is a specified measurement window after the trigger signaling is transmitted and closest to a sub-frame in which the trigger signaling is transmitted, and M is an integer more than or equal to 0.

8. The method according to claim 7, wherein the length of the measurement window is predefined;

or

the length of the measurement window is informed by the base station to the user equipment via higher-layer signaling;

or

the trigger signaling comprises information about the length of the measurement window, wherein the information about the length of the measurement window is the length of the measurement window, or is indication information indicating that the length of the measurement window is a predefined fixed length or a length indicated in higher-layer signaling.

9. The method according to claim 8, wherein the length of the measurement window is the number of sub-frames for CSI measurement in the measurement window;

or the length of the measurement window is the number of consecutive sub-frames in the measurement window;

wherein the number of consecutive sub-frames in the measurement window is a value less than or equal to N, wherein N is the number of consecutive sub-frames between a sub-frame in which the base station transmits the trigger signaling and a sub-frame in which the base station receives the CSI reported by the user equipment.

10. The method according to claim 7, wherein the base station receives the CSI, reported by the user equipment, measured in the first measurement window over the latest PUCCH resource after M sub-frames elapse since the trigger signaling is transmitted;

or

the base station receives the CSI, reported by the user equipment, measured in the first measurement window over a PUSCH resource in the M-th sub-frame after the trigger signaling is transmitted.

11. The method according to claim 7, wherein the base station receives the CSI, reported by the user equipment, measured in the second measurement window over the latest PUCCH resource after M sub-frames elapse following the end of the second measurement window;

or

the base station receives the CSI, reported by the user equipment, measured in the second measurement window over a PUSCH resource in the M-th sub-frame following the end of the second measurement window;

or

the base station receives the CSI, reported by the user equipment, measured in the second measurement window over the latest PUCCH resource after M sub-frames elapse since the trigger signaling is transmitted;

or

the base station receives the CSI, reported by the user equipment, measured in the second measurement window over a PUSCH resource in the M-th sub-frame after the trigger signaling is transmitted.

12. A device for feeding back channel state information, the device comprising:

a processor, a memory, a receiver and a transmitter;

wherein the transmitter is controlled by the processor to transmit data, the receiver is controlled by the processor to receive data, the memory stores preset program, and the processor reads the program in the memory, and to execute the program;

to receive a trigger signaling transmitted by a base station, wherein the trigger signaling indicates the device to report Channel State Information (CSI) obtained in a specified measurement window; and

to report the CSI measured by the device in the measurement window to the base station;

wherein the processor;

reports CSI measured by the device in a first measurement window to the base station after M sub-frames elapse since the trigger signaling is received, wherein the first measurement window is a measurement window before the trigger signaling is received and closest to a sub-frame in which the trigger signaling is received, and M is an integer more than or equal to 0;

or

reports CSI measured by the device in a second measurement window to the base station after M sub-frames elapse following the end of the second measurement window, wherein the second measurement window is a specified measurement window after the trigger signaling is received and closest to a sub-frame in which the trigger signaling is received, and M is an integer more than or equal to 0;

or

reports CSI measured by the device in a second measurement window to the base station after M sub-frames elapse since the trigger signaling is received, wherein the second measurement window is a specified measurement window after the trigger signaling is received and closest to a sub-frame in which the trigger signaling is received, and M is an integer more than or equal to 0.

13. The device according to claim 12, wherein the processor:

reports the CSI measured by the device in the first measurement window to the base station over the latest PUCCH resource after M sub-frames elapse since the receiving module receives the trigger signaling;

or to report the CSI measured by the device in the first measurement window to the base station over a PUSCH resource in the M-th sub-frame after the receiving module receives the trigger signaling.

14. The device according to claim 12, wherein the processor:

reports the CSI measured by the device in the second measurement window to the base station over the latest PUCCH resource after M sub-frames elapse following the end of the second measurement window;

or

reports the CSI measured by the device in the second measurement window to the base station over a PUSCH resource in the M-th sub-frame following the end of the second measurement window;

or

reports the CSI measured by the device in the second measurement window to the base station over the latest PUCCH resource after M sub-frames elapse since the receiving module receives the trigger signaling;

or

reports the CSI measured by the device in the second measurement window to the base station over a PUSCH resource in the M-th sub-frame after the receiving module receives the trigger signaling.