Channel state information measurement method and apparatus and network side device

Patent metadata

Field	Value
Publication number	US-2022014250-A1
Application number	US-202117484936-A
Country	US
Kind code	A1
Filing date	Sep 24, 2021
Priority date	Mar 25, 2019
Publication date	Jan 13, 2022
Grant date	—

Abstract

A channel state information measurement method and apparatus and a network side device are described. The measurement method includes configuring, by a network side device, channel state information reference signal (CSI-RS) transmit information of M access points. The CSI-RS transmit information is used to indicate the M access points to periodically send a CSI-RS to a first user equipment at a preset interval. The preset interval is a time interval and/or a subband interval, and M is an integer greater than 1. The network side device obtains channel state information (CSI) corresponding to each of the M access points. The CSI corresponding to the access point includes first CSI, and the first CSI is information that is measured based on the CSI-RS corresponding to the access point and fed back by the first user equipment.

First claim

What is claimed is:

1 . A channel state information measurement method, comprising:
configuring, by a network side device, channel state information reference signal (CSI-RS) transmit information of M access points, wherein the CSI-RS transmit information is used to indicate the M access points to periodically send a CSI-RS to a first user equipment at a preset interval, the preset interval is a time interval and/or a subband interval, and M is an integer greater than 1; and obtaining, by the network side device, channel state information (CSI) corresponding to each of the M access points, wherein the CSI corresponding to the access point comprises first CSI, and the first CSI is information that is measured based on the CSI-RS corresponding to the access point and fed back by the first user equipment, wherein when the preset interval is the subband interval, a precoding matrix indicator (PMI) in the CSI corresponding to the access point is fed back at a granularity of a subband.

2 . The measurement method according to claim 1 , wherein when the preset interval is the subband interval, periodically sending, by the M access points, the CSI-RS to the first user equipment at the preset interval comprises:
sending, by the M access points, the CSI-RS in polling mode in any system bandwidth at the subband interval.

3 . The measurement method according to claim 1 , wherein periodically sending, by the M access points, the CSI-RS to the first user equipment at the preset interval comprises: periodically sending, by the M access points or K joint access point groups, the CSI-RS to the first user equipment at the preset interval, wherein the K joint access point groups are obtained by dividing the M access points into K groups, access points in any one of the K joint access point groups are configured to jointly send the CSI-RS, and K is a positive integer.

4 . The measurement method according to claim 3 , wherein when the preset interval is the subband interval, the periodically sending, by the M access points or K joint access point groups, the CSI-RS to the first user equipment at the preset interval comprises:
sending, by the M access points or the K joint access point groups, the CSI-RS in polling mode in any system bandwidth at the subband interval.

5 . The measurement method according to claim 3 , wherein the periodically sending, by the M access points or K joint access point groups, the CSI-RS to the first user equipment at the preset interval comprises:
determining a reference antenna of each access point in a first joint access point group; and mapping each port in a first CSI-RS to the reference antenna of the access point in the first joint access point group, wherein the reference antenna of the access point in the first joint access point group is mapped to at least one port.

6 . The measurement method according to claim 3 , wherein the obtaining, by the network side device, channel state information CSI corresponding to each of the M access points comprises:
obtaining, by the network side device, first joint CSI, wherein the first joint CSI is information that is measured based on a first joint CSI-RS and fed back by the first user equipment, and the first joint CSI-RS is a CSI-RS jointly sent by access points in a first joint access point group in the K joint access point groups; and the measurement method comprises: determining, based on rank indicators (RIs) and precoding matrix indicators (PMIs) in CSI corresponding to access points in a working set corresponding to the first user equipment and a PMI in CSI corresponding to the first joint access point group, a joint weight of coherent joint transmission corresponding to the working set, wherein the first joint access point group comprises the access points in the working set.

7 . A channel state information measurement apparatus, comprising:
a configuration unit, configured to configure channel state information reference signal (CSI-RS) transmit information of M access points, wherein the CSI-RS transmit information is used to indicate the M access points to periodically send a CSI-RS to a first user equipment at a preset interval, the preset interval is a time interval and/or a subband interval, and M is an integer greater than 1; and an obtaining unit, configured to obtain channel state information (CSI) corresponding to each of the M access points, wherein the CSI corresponding to the access point comprises first CSI, and the first CSI is information that is measured based on the CSI-RS corresponding to the access point and fed back by the first user equipment, wherein when the preset interval is the subband interval, a precoding matrix indicator (PMI) in the CSI corresponding to the access point is fed back at a granularity of a subband.

8 . The measurement apparatus according to claim 7 , wherein when the preset interval is the subband interval, periodically sending, by the M access points, the CSI-RS to the first user equipment at the preset interval comprises:
sending, by the M access points, the CSI-RS in polling mode in any system bandwidth at the subband interval.

9 . The measurement apparatus according to claim 7 , wherein periodically sending, by the M access points, the CSI-RS to the first user equipment at the preset interval comprises: periodically sending, by the M access points or K joint access point groups, the CSI-RS to the first user equipment at the preset interval, wherein the K joint access point groups are obtained by dividing the M access points into K groups, access points in any one of the K joint access point groups are configured to jointly send the CSI-RS, and K is a positive integer.

10 . The measurement apparatus according to claim 9 , wherein when the preset interval is the subband interval, the periodically sending, by the M access points or K joint access point groups, the CSI-RS to the first user equipment at the preset interval comprises:
sending, by the M access points or the K joint access point groups, the CSI-RS in polling mode in any system bandwidth at the subband interval.

11 . The measurement apparatus according to claim 9 , wherein the periodically sending, by the M access points or K joint access point groups, the CSI-RS to the first user equipment at the preset interval comprises:
determining a reference antenna of each access point in a first joint access point group; and mapping each port in a first CSI-RS to the reference antenna of the access point in the first joint access point group, wherein the reference antenna of the access point in the first joint access point group is mapped to at least one port.

12 . The measurement apparatus according to claim 9 , wherein the obtaining unit is configured to obtain first joint CSI, wherein the first joint CSI is information that is measured based on a first joint CSI-RS and fed back by the first user equipment, and the first joint CSI-RS is a CSI-RS jointly sent by access points in a first joint access point group in the K joint access point groups; and
the measurement apparatus further comprises a first determining unit, configured to determine, based on rank indicators (RIs) and precoding matrix indicators (PMIs) in CSI corresponding to access points in a working set corresponding to the first user equipment and a PMI in CSI corresponding to the first joint access point group, a joint weight of coherent joint transmission corresponding to the working set, wherein the first joint access point group comprises the access points in the working set.

13 . A non-transitory memory storage medium comprising computer-executable instructions that, when executed, facilitate

Assignees

• Huawei Tech Co Ltd

Inventors

• Sun Yunfeng
• Li Guibao
• Lu Chenhong
• Lou Qunfang
• Wang Zhiying
• Li Feng

Classifications

• H04B7/0478

  Special codebook structures directed to feedback optimisation · CPC title

• H04W24/02 Primary

  Arrangements for optimising operational condition · CPC title

• H04W24/10

  Scheduling measurement reports {; Arrangements for measurement reports} · CPC title

• H04B7/024 Primary

  Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems · CPC title

• H04W24/08

  Testing, {supervising or monitoring} using real traffic · CPC title