EP-4738944-A1 - POWER CONTROL METHOD AND APPARATUS

EP4738944A1EP 4738944 A1EP4738944 A1EP 4738944A1EP-4738944-A1

Abstract

This application discloses a power control method and apparatus. This application may be applied to a wireless communication system. The method includes: generating first information, where the first information includes precoding information, the precoding information is used to determine an uplink precoding matrix and power control information to be used by a terminal device, and the power control information is used to determine an uplink transmit power of the terminal device; and sending the first information. The precoding information is used to determine the power control information to be used by the terminal device, and the power control information may not be explicitly sent. In this way, signaling overheads can be reduced. Because the power control information is not carried by using a TPC command, precision of the power control information may not be limited by the signaling overheads, so that a corresponding design may be performed based on a system requirement. Therefore, the precision of the power control information determined by using the precoding information may be higher than precision obtained by adjusting the uplink transmit power by using the TPC command.

Inventors

JIN, YU
TIAN, Yang
CHAI, Xiaomeng
SUN, YAN
JIN, Huangping

Assignees

Huawei Technologies Co., Ltd.

Dates

Publication Date: 20260506
Application Date: 20240711

Claims (17)

A power control method, comprising: generating first information, wherein the first information comprises precoding information, the precoding information is used to determine an uplink precoding matrix and power control information to be used by a terminal device, and the power control information is used to determine an uplink transmit power of the terminal device; and sending the first information.
The method according to claim 1, wherein a modulus of the uplink precoding matrix is associated with the power control information.
The method according to claim 1 or 2, wherein before generating the first information, the method further comprises: compressing second information by using a precoding compression model, to obtain the precoding information, wherein the second information comprises the uplink precoding matrix.
The method according to claim 3, wherein the method further comprises: receiving capability information from the terminal device; and obtaining, based on the capability information, a precoding recovery model to be used by the terminal device, and sending model information to the terminal device, wherein the model information is used for constructing the precoding recovery model, and the precoding recovery model corresponds to the precoding compression model.
The method according to claim 3, wherein the method further comprises: receiving indication information from the terminal device, wherein the indication information indicates a precoding recovery model used by the terminal device; and obtaining, based on the indication information, the precoding compression model corresponding to the precoding recovery model.
The method according to any one of claims 1 to 5, wherein the method further comprises: sending third information, wherein the third information comprises a threshold, and the threshold is used to determine a path loss used by the terminal device.
A power control method, comprising: receiving first information, wherein the first information comprises precoding information, the precoding information is used to determine an uplink precoding matrix and power control information to be used by a terminal device, and the power control information is used to determine an uplink transmit power of the terminal device; and obtaining the uplink precoding matrix and the power control information based on the first information.
The method according to claim 7, wherein a modulus of the uplink precoding matrix is associated with the power control information.
The method according to claim 8, wherein obtaining the uplink precoding matrix and the power control information based on the first information comprises: parsing the first information to obtain the uplink precoding matrix; and obtaining the power control information based on the uplink precoding matrix.
The method according to claim 8, wherein obtaining the uplink precoding matrix and the power control information based on the first information comprises: processing the precoding information by using a precoding recovery model, to obtain the uplink precoding matrix, wherein the precoding information is obtained by compressing second information by using a precoding compression model, the second information comprises the uplink precoding matrix, and the precoding recovery model corresponds to the precoding compression model; and obtaining the power control information based on the uplink precoding matrix.
The method according to claim 10, wherein the method further comprises: sending capability information, wherein the capability information is used to determine the precoding recovery model used by the terminal device; and receiving model information, wherein the model information is used to construct the precoding recovery model used by the terminal device.
The method according to claim 10, wherein the method further comprises: sending indication information, wherein the indication information indicates the precoding recovery model used by the terminal device.
The method according to any one of claims 7 to 12, wherein a path loss used to determine the uplink transmit power of the terminal device is related to the power control information.
The method according to claim 13, wherein the method further comprises: obtaining, through measurement, reference signal received powers RSRPs of a plurality of downlink reference signals; and when the power control information is less than or equal to a threshold, determining the path loss in a first manner, and determining the uplink transmit power based on the path loss and the power control information; or when the power control information is greater than the threshold, determining the path loss in a second manner, and determining the uplink transmit power based on the path loss and the power control information, wherein the second manner is different from the first manner.
The method according to claim 14, wherein the method further comprises: receiving third information comprising the threshold.
A communication apparatus, comprising a module configured to implement the method according to any one of claims 1 to 6 or any one of claims 7 to 15.
A computer program product, wherein when the computer program product runs on a computer, the computer is enabled to perform the method according to any one of claims 1 to 6 or the method according to any one of claims 7 to 15.

Description

This application claims priority to Chinese Patent Application No. 202310882514.3, filed with the China National Intellectual Property Administration on July 18, 2023 and entitled "POWER CONTROL METHOD AND APPARATUS", which is incorporated herein by reference in its entirety. TECHNICAL FIELD This application relates to the communication field, and in particular, to a power control method and apparatus. BACKGROUND Uplink power control in a new radio (new radio, NR) system uses a technical solution combining open-loop power control with partial path loss compensation and fast closed-loop power control. Open-loop power control means that a terminal performs, without feedback information of a base station, partial compensation based on a path loss and shadow fading of the terminal, to control an overall interference level. In a full path loss compensation manner, a higher transmit power may be provided for the terminal to compensate for the path loss, but inter-cell interference, especially a level of interference to a neighboring cell when the terminal is at a cell edge, may also increase. A function of a path loss compensation factor α is to allow the terminal to perform partial compensation on the path loss to reduce interference to the neighboring cell and intra-cell interference, to make a compromise between a maximum system capacity and transmission performance at the cell edge. When α=1, it means that the terminal performs full path loss compensation on a transmitted uplink signal, so that signal-to-noise ratios of all user signals are as close as possible at a receive end. In this case, an overall capacity of the cell is reduced, but a transmission rate at the cell edge is high. To balance the overall cell capacity and the transmission performance at the cell edge, an appropriate path loss compensation factor can be selected in 0<α<1. The closed-loop power control means that the terminal dynamically adjusts a transmit power according to a modulation and coding scheme (modulation and coding scheme, MCS) selected by the base station. The MCS of the terminal is scheduled by the base station. Setting the MCS of the terminal can quickly adjust transmit power spectrum density to achieve an effect similar to an effect of fast power control. In addition, the terminal adjusts an uplink transmit signal power by using a transmit power control (transmit power control, TPC) command carried in downlink control information (downlink control information, DCI). A currently used closed-loop power control solution has a problem of low power control precision. Therefore, a power control solution with higher power control precision needs to be studied. SUMMARY Embodiments of this application disclose a power control method and apparatus, to improve precision of uplink transmit power control. According to a first aspect, an embodiment of this application provides a power control method, where the method includes: generating first information, where the first information includes precoding information, the precoding information is used to determine an uplink precoding matrix and power control information to be used by a terminal device, and the power control information is used to determine an uplink transmit power of the terminal device; and sending the first information. In this embodiment of this application, the precoding information is used to determine the uplink precoding matrix and the power control information to be used by the terminal device. The precoding information is used to determine the power control information to be used by the terminal device, and the power control information may not be explicitly sent. In this way, signaling overheads can be reduced. Because the power control information is not carried by using a TPC command, precision of the power control information may not be limited by the signaling overheads, so that a corresponding design may be performed based on a system requirement. Therefore, the precision of the power control information determined by using the precoding information may be higher than precision obtained by adjusting the uplink transmit power by using the TPC command. In this way, precision of uplink transmit power control can be improved. In a possible implementation, precision of the power control information is higher than the precision threshold. The precision threshold is greater than or equal to the precision of adjusting the uplink transmit power by using the TPC command. For example, the precision of the power control information may be configured based on an actual requirement. This is not limited herein. In this implementation, the precision of the power control information is higher than the precision threshold, and the uplink transmit power of the terminal device is determined by using the power control information, so that precision of uplink transmit power control can be improved. In a possible implementation, a modulus of the uplink precoding matrix is associated