Method and device for performing improved beam tracking in next-generation wireless communication system

Patent metadata

Field	Value
Publication number	US-2023421224-A1
Application number	US-202118254411-A
Country	US
Kind code	A1
Filing date	Dec 6, 2021
Priority date	Dec 10, 2020
Publication date	Dec 28, 2023
Grant date	—

Abstract

The present disclosure relates to a 6G communication system for accomplishing ultra-low delay time and a data transmission rate higher than that of 4G and 5G communication systems. According to embodiments of the present disclosure, a base station can match (or map), to a channel state information-reference signal (CSI-RS), beams having a high probability of being selected as the beam with the best performance at the location of a terminal, and can provide the CSI-RS to the terminal. Therefore, the possibility of the inclusion of the beams with the best performance from among the beams corresponding to the CSI-RS can be increased. Thus, beam tracking with more improved performance can be performed when a beamforming technology is operated in millimeter wave and terahertz bands, or ultrahigh frequency bands or higher.

First claim

1 . A method performed by a terminal in a communication system, the method comprising:
receiving a message including cluster information from a first base station; identifying whether a cluster corresponding to the location of the terminal is changed, based on the cluster information and location information of the terminal; and in case that the cluster is changed, transmitting a channel state information (CSI) report including information about the changed cluster to the first base station, wherein the cluster information comprises information about at least one cluster identified based on a location-specific beam pattern, and wherein the location-specific beam pattern is identified based on information about a best beam and location information for each of a plurality of terminals served by the first base station.

2 . The method of claim 1 , wherein the at least one cluster corresponds to at least one beam pattern identified according to a result of clustering the location-specific beam pattern,
wherein the location information of the terminal is identified based on global positioning system (GPS) information, and wherein the best beam is identified based on at least one of reference signal received power (RSRP) or channel quality, among a plurality of beams.

3 . The method of claim 1 , wherein the location information of the terminal is identified based on a result of measuring reference signal received power (RSRP) of a reference signal, and
wherein the reference signal is transmitted by a second base station.

4 . The method of claim 1 , further comprising receiving a CSI-RS identified based on the information about the changed cluster,
wherein the CSI-RS corresponds to at least one beam identified based on a beam pattern corresponding to the changed cluster, and wherein the information on the CSI-RS is identified based on information about a transmission configuration indicator (TCI) state related to the at least one beam corresponding to the CSI-RS.

5 . A method performed by a first base station in a communication system, the method comprising:
transmitting a message including cluster information to a terminal; in case that a cluster corresponding to the location of the terminal is changed, receiving a channel state information (CSI) report including information about the changed cluster from the terminal; identifying at least one beam corresponding to a channel state information-reference signal (CSI-RS) based on the information about the changed cluster; and based on the identified at least one beam, transmitting the CSI-RS to the terminal, wherein the cluster information comprises information about at least one cluster identified based on a location-specific beam pattern, and wherein the location-specific beam pattern is identified based on information about a best beam and location information for each of a plurality of terminals served by the first base station.

6 . The method of claim 5 , wherein the at least one cluster corresponds to at least one beam pattern identified according to a result of clustering the location-specific beam pattern,
wherein the location-specific beam pattern is clustered based on a predetermined criterion, wherein the location information of the terminal is identified based on global positioning system (GPS) information, whether the cluster corresponding to the location of the terminal is changed is identified based on the location information of the terminal and the cluster information, and wherein the best beam is identified based on at least one of reference signal received power (RSRP) or channel quality, among a plurality of beams.

7 . The method of claim 5 , wherein the location information of the terminal is identified based on a result of measuring reference signal received power (RSRP) of a reference signal, and
wherein the reference signal is transmitted by a second base station.

8 . The method of claim 5 , wherein the information on the CSI-RS is identified based on information on a transmission configuration indicator (TCI) state related to the at least one beam corresponding to the CSI-RS.

9 . A terminal of a communication system, the terminal comprising:
a transceiver; and a controller connected to the transceiver, wherein the controller is configured to: receive a message including cluster information from a first base station; based on the cluster information and location information of the terminal, identify whether a cluster corresponding to the location of the terminal is changed; and in case that the cluster is changed, transmit a channel state information (CSI) report including information about the changed cluster to the first base station, wherein the cluster information comprises information about at least one cluster identified based on a location-specific beam pattern, and wherein the location-specific beam pattern is identified based on information about a best beam and location information for each of a plurality of terminals served by the first base station.

10 . The terminal of claim 9 , wherein the at least one cluster corresponds to at least one beam pattern identified according to a result of clustering the location-specific beam pattern,
wherein the location information of the terminal is identified based on global positioning system (GPS) information, and wherein the best beam is identified based on at least one of reference signal received power (RSRP) or channel quality, among a plurality of beams.

11 . The terminal of claim 9 , wherein the location information of the terminal is identified based on a result of measuring reference signal received power (RSRP) of a reference signal, and
wherein the reference signal is transmitted by a second base station.

12 . The terminal of claim 9 , wherein the controller is configured to receive a CSI-RS identified based on the information about the changed cluster,
wherein the CSI-RS corresponds to at least one beam identified based on a beam pattern corresponding to the changed cluster, and wherein the information on the CSI-RS is identified based on information on a transmission configuration indicator (TCI) state related to the at least one beam corresponding to the CSI-RS.

13 . A first base station of a communication system, the first base station comprising:
a transceiver; and a controller connected to the transceiver, wherein the controller is configured to: transmit a message including cluster information to a terminal; in case that the cluster corresponding to the location of the terminal is changed, receive a channel state information (CSI) report including information about the changed cluster from the terminal; identify at least one beam corresponding to a channel state information-reference signal (CSI-RS) based on the information about the changed cluster; and transmit the CSI-RS to the terminal based on the identified at least one beam, wherein the cluster information comprises information about at least one cluster identified based on a location-specific beam pattern, and wherein the location-specific beam pattern is identified based on information about a best beam and location information for each of a plurality of terminals served by the first base station.

14 . The first base station of claim 13 , wherein the at least one cluster corresponds to at least one beam pattern identified according to a result of clustering the location-specific beam pattern,
wherein the location-specific beam pattern is clustered based on a predetermined criterion, wherein the location information of the terminal is identified based on global positioni

Assignees

• Samsung Electronics Co Ltd

Inventors

• Lee Sangho
• Shin Sungjin
• Lee Byunghyun
• Jung Jungsoo

Classifications

• H04B17/328

  Reference signal received power [RSRP]; Reference signal received quality [RSRQ] · CPC title

• H04B7/0639

  Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection · CPC title

• H04B7/0632

  Channel quality parameters, e.g. channel quality indicator [CQI] · CPC title

• H04B7/0626 Primary

  Channel coefficients, e.g. channel state information [CSI] · CPC title

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title