EP-4738752-A1 - COMMUNICATION METHOD AND APPARATUS

EP4738752A1EP 4738752 A1EP4738752 A1EP 4738752A1EP-4738752-A1

Abstract

This application provides a communication method and apparatus, to improve communication performance of a terminal device. The method includes: A terminal device camps on a first cell in an idle state or an inactive state; the terminal device measures the first cell based on a first NCD-SSB frequency, and measures a second cell based on the first NCD-SSB frequency and/or a CD-SSB frequency; and the terminal device performs cell reselection based on a measurement result of the first cell and a measurement result of the second cell. In this manner, when no CD-SSB frequency is configured or cell reselection cannot be performed based on the CD-SSB frequency, the terminal device can perform cell reselection based on the NCD-SSB frequency. In this manner, flexibility of the cell reselection can be improved, and further, communication performance of the terminal device can be improved.

Inventors

LI, Chenwan
CHEN, LEI
LI, BINGZHAO
SHI, Yulong

Assignees

Huawei Technologies Co., Ltd.

Dates

Publication Date: 20260506
Application Date: 20230220

Claims (15)

A communication method, the terminal device camps on a first cell in an idle state or an inactive state, and the method comprises: measuring, the first cell based on a first non-cell defining synchronization signal/physical broadcast channel block, NCD-SSB, frequency; measuring, a second cell based on the first NCD-SSB frequency and/or a cell defining synchronization signal/physical broadcast channel block, CD-SSB, frequency; and performing, cell reselection based on a measurement result of the first cell and a measurement result of the second cell.
The method according to claim 1, wherein the measuring, a second cell based on the first NCD-SSB frequency comprises: measuring, based on first information from a network device, the second cell based on the first NCD-SSB frequency, wherein the first information indicates that the first NCD-SSB frequency can be used for neighboring cell measurement.
The method according to claim 1, wherein the measuring, a second cell based on the first NCD-SSB frequency and a CD-SSB frequency comprises: measuring, the second cell based on the first NCD-SSB frequency; determining, based on the measurement result of the second cell, that the second cell cannot be used as a target cell for reselection; and measuring, the second cell based on the CD-SSB frequency.
The method according to claim 3, wherein before the measuring, the second cell based on the first NCD-SSB frequency, the method further comprises: receiving, second information from a network device, wherein the second information indicates that a neighboring cell is measured based on the CD-SSB frequency.
The method according to claim 1, wherein the measuring, a second cell based on a CD-SSB frequency comprises: measuring, based on third information from a network device, the second cell based on the CD-SSB frequency, wherein the third information indicates that neighboring cell measurement can be performed only based on the CD-SSB frequency.
The method according to any one of claims 1 to 5, wherein before the measuring, a second cell based on the first NCD-SSB frequency and/or a CD-SSB frequency, the method further comprises: determining, that the measurement result of the first cell satisfies a threshold corresponding to the first NCD-SSB frequency, wherein the threshold corresponding to the first NCD-SSB frequency is configured by the network device, or the threshold corresponding to the first NCD-SSB frequency is determined based on a threshold corresponding to the CD-SSB frequency and a power compensation value of the first cell.
The method according to any one of claims 1 to 6, wherein the performing, cell reselection based on a measurement result of the first cell and a measurement result of the second cell comprises: determining, an R value of the first cell based on the measurement result of the first cell; determining, an R value of the second cell based on the measurement result of the second cell; and performing, cell reselection based on the R value of the first cell and the R value of the second cell.
The method according to claim 7, wherein the determining, an R value of the first cell based on the measurement result of the first cell comprises: determining, the R value of the first cell based on the measurement result of the first cell and the power compensation value of the first cell.
The method according to claim 7 or 8, wherein the determining, an R value of the second cell based on the measurement result of the second cell comprises: determining, the R value of the second cell based on the measurement result of the second cell and a power compensation value of the second cell.
A communication method, comprising: determining, indication information based on a configuration of a non-cell defining synchronization signal/physical broadcast channel block, NCD-SSB, frequency of a second cell, wherein the indication information indicates that a first NCD-SSB frequency and/or a cell defining synchronization signal/physical broadcast channel block, CD-SSB, frequency are/is used by a terminal device to measure the second cell, and the terminal device camps on a first cell in an idle state or an inactive state; and sending, the indication information to the terminal device.
The method according to claim 10, wherein that the indication information indicates that a first NCD-SSB frequency is used by a terminal device to measure the second cell specifically comprises: the indication information indicates that the first NCD-SSB frequency can be used for neighboring cell measurement; that the indication information indicates that a first NCD-SSB frequency and a CD-SSB frequency are used by a terminal device to measure the second cell specifically comprises: the indication information indicates that a neighboring cell is measured based on the CD-SSB frequency; or that the indication information indicates that a CD-SSB frequency is used by a terminal device to measure the second cell specifically comprises: the indication information indicates that neighboring cell measurement can be performed only based on the CD-SSB frequency.
The method according to claim 10 or 11, wherein the method further comprises: sending, fourth information and/or fifth information to the terminal device, wherein the fourth information indicates a power compensation value of the first cell, and the fifth information indicates a power compensation value of the second cell.
A communication apparatus, configured to perform the method according to any one of claims 1 to 9.
A communication apparatus, configured to perform the method according to any one of claims 10 to 12.
A computer-readable storage medium, wherein the computer-readable storage medium is configured to store computer instructions; and when the computer instructions are run on a computer, the computer is enabled to perform the method according to any one of claims 1 to 9 or the method according to any one of claims 10 to 12.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to Chinese Patent Application No. 202210211027.X, filed with the China National Intellectual Property Administration on March 4, 2022 and entitled "COMMUNICATION METHOD AND APPARATUS", which is incorporated herein by reference in its entirety. TECHNICAL FIELD This application relates to the field of communication technologies, and in particular, to a communication method and apparatus. BACKGROUND Currently, in a new radio system, a terminal device in an idle state can perform cell reselection based on a synchronization signal block (synchronization signal block, SSB). When the terminal device performs cell reselection based on the SSB, cell reselection is performed based on a cell defining synchronization signal/physical broadcast channel block (cell defining synchronization signal block, CD-SSB). However, there may be no CD-SSB on an initial bandwidth part (bandwidth part, BWP) of the terminal device. Consequently, the terminal device cannot normally perform cell reselection, and a problem such as communication interruption or poor communication quality is caused. Therefore, how to improve communication performance of the terminal device becomes an urgent technical problem to be resolved. SUMMARY This application provides a communication method and apparatus, to improve communication performance of a terminal device. According to a first aspect, this application provides a communication method. The method may be performed by a terminal device, or may be performed by a chip or a circuit in a terminal device. Using the terminal device as an example, the terminal device camps on a first cell in an idle state or an inactive state, and the method includes: The terminal device measures the first cell based on a first NCD-SSB frequency, and measures a second cell based on the first NCD-SSB frequency and/or a CD-SSB frequency; and the terminal device performs cell reselection based on a measurement result of the first cell and a measurement result of the second cell. This embodiment of this application provides an NCD-SSB frequency-based measurement manner, so that when no CD-SSB frequency is configured or cell reselection cannot be performed based on the CD-SSB frequency, the terminal device can perform cell reselection based on the NCD-SSB frequency. This can avoid a problem that communication performance of the terminal device is poor because cell reselection cannot be performed. Therefore, according to the method provided in this embodiment of this application, flexibility of the cell reselection can be improved, and further, the communication performance of the terminal device can be improved. In a possible design, that the terminal device measures a second cell based on the first NCD-SSB frequency includes: The terminal device measures, based on first information from a network device, the second cell based on the first NCD-SSB frequency, where the first information indicates that the first NCD-SSB frequency can be used for neighboring cell measurement. In the foregoing manner, the terminal device can perform neighboring cell measurement based on an indication of the network device, so that flexibility of the cell reselection can be improved. In a possible design, that the terminal device measures a second cell based on the first NCD-SSB frequency and a CD-SSB frequency includes: The terminal device measures the second cell based on the first NCD-SSB frequency; the terminal device determines, based on the measurement result of the second cell, that the second cell cannot be used as a target cell for reselection; and the terminal device measures the second cell based on the CD-SSB frequency. According to the foregoing design, when cell reselection cannot be performed based on the first NCD-SSB frequency, cell reselection can be performed based on the CD-SSB frequency, so that a problem that the communication performance of the terminal device is poor because cell reselection cannot be performed can be avoided. In a possible design, before the terminal device measures the second cell based on the first NCD-SSB frequency, the method further includes: The terminal device receives second information from a network device, where the second information indicates that a neighboring cell is measured based on the CD-SSB frequency. In the foregoing manner, the terminal device can perform neighboring cell measurement based on an indication of the network device, so that the flexibility of the cell reselection can be improved. In a possible design, that the terminal device measures a second cell based on a CD-SSB frequency includes: The terminal device measures, based on third information from a network device, the second cell based on the CD-SSB frequency, where the third information indicates that neighboring cell measurement can be performed only based on the CD-SSB frequency. In the foregoing manner, the terminal device can perform neighboring c