US-12628095-B2 - Transmit power control method and apparatus

US12628095B2US 12628095 B2US12628095 B2US 12628095B2US-12628095-B2

Abstract

The present disclosure relates to transmit power control methods and apparatuses. In one example method, a network device determines a transmit power threshold corresponding to a spatial grid. The network device schedules a resource block (RB) or a carrier of one or more terminal devices corresponding to the spatial grid to control a transmit power corresponding to the spatial grid to be less than or equal to the transmit power threshold corresponding to the spatial grid.

Inventors

Tao Jin
Lin Huang
Chunlin XUE
Yunhan ZHANG

Assignees

HUAWEI TECHNOLOGIES CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20230328
Priority Date: 20200929

Claims (18)

1 . A method, comprising: dividing, by a network device, space into a plurality of spatial grids; for each spatial grid of the plurality of spatial grids, determining, by the network device, a transmit power threshold corresponding to the spatial grid; and scheduling, by the network device, a resource block (RB) of one or more terminal devices corresponding to the spatial grid to control a transmit power corresponding to the spatial grid to be less than or equal to the transmit power threshold corresponding to the spatial grid, wherein scheduling the RB of the one or more terminal devices corresponding to the spatial grid comprises: enabling, by the network device, a plurality of terminal devices corresponding to the spatial grid to share the RB; reducing, by the network device, a power spectral density of the RB of the one or more terminal devices corresponding to the spatial grid; or reducing, by the network device, a quantity of RBs of the one or more terminal devices corresponding to the spatial grid.
2 . The method according to claim 1 , wherein the network device determines the transmit power corresponding to the spatial grid based on a sum of projected powers that are on the spatial grid and that are of power weight vectors corresponding to the one or more terminal devices communicating with the network device.
3 . The method according to claim 1 , wherein the transmit power threshold corresponding to the spatial grid satisfies E=4πR 2 S, and wherein E is the transmit power threshold corresponding to the spatial grid, S is a power spectral density limit, and R is a safety distance corresponding to the spatial grid.
4 . The method according to claim 1 , wherein reducing, by the network device, the quantity of RBs of the one or more terminal devices corresponding to the spatial grid comprises: scheduling, by the network device, RBs at an interval for the one or more terminal devices corresponding to the spatial grid.
5 . The method according to claim 1 , wherein scheduling, by the network device, the RB of the one or more terminal devices corresponding to the spatial grid comprises: performing, by the network device, at least one of power back-off or beam gain suppression on a beam corresponding to the spatial grid.
6 . The method according to claim 1 , wherein dividing, by the network device, the space into the plurality of spatial grids comprises: performing, by the network device, spatial grid division based on an antenna pattern.
7 . A non-transitory computer-readable storage medium, wherein the storage medium stores a computer program or instructions which, when executed by a transmit power control apparatus, cause the transmit power control apparatus to perform operations comprising: dividing space into a plurality of spatial grids; for each spatial grid of the plurality of spatial grids, determining a transmit power threshold corresponding to the spatial grid; and scheduling a resource block (RB) of one or more terminal devices corresponding to the spatial grid to control a transmit power corresponding to the spatial grid to be less than or equal to the transmit power threshold corresponding to the spatial grid, wherein scheduling the RB of the one or more terminal devices corresponding to the spatial grid comprises: enabling a plurality of terminal devices corresponding to the spatial grid to share the RB; reducing a power spectral density of the RB of the one or more terminal devices corresponding to the spatial grid; or reducing a quantity of RBs of the one or more terminal devices corresponding to the spatial grid.
8 . The non-transitory computer-readable storage medium according to claim 7 , wherein reducing the quantity of RBs of the one or more terminal devices corresponding to the spatial grid comprises: scheduling RBs at an interval for the one or more terminal devices corresponding to the spatial grid.
9 . The non-transitory computer-readable storage medium according to claim 7 , wherein scheduling the RB of the one or more terminal devices corresponding to the spatial grid comprises: performing at least one of power back-off or beam gain suppression on a beam corresponding to the spatial grid.
10 . The non-transitory computer-readable storage medium according to claim 7 , wherein the transmit power control apparatus determines the transmit power corresponding to the spatial grid based on a sum of projected powers that are on the spatial grid and that are of power weight vectors corresponding to the one or more terminal devices communicating with the transmit power control apparatus.
11 . The non-transitory computer-readable storage medium according to claim 7 , wherein the transmit power threshold corresponding to the spatial grid satisfies E=4πR 2 S, and wherein E is the transmit power threshold corresponding to the spatial grid, S is a power spectral density limit, and R is a safety distance corresponding to the spatial grid.
12 . The non-transitory computer-readable storage medium according to claim 7 , wherein dividing the space into the plurality of spatial grids comprises: performing spatial grid division based on an antenna pattern.
13 . An apparatus, comprising: at least one processor; a transceiver; and one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor to cause the apparatus to: divide space into a plurality of spatial grids; for each spatial grid of the plurality of spatial grids, determine a transmit power threshold corresponding to the spatial grid; and schedule a resource block (RB) of one or more terminal devices corresponding to the spatial grid to control a transmit power corresponding to the spatial grid to be less than or equal to the transmit power threshold corresponding to the spatial grid, wherein scheduling the RB of the one or more terminal devices corresponding to the spatial grid comprises: enabling a plurality of terminal devices corresponding to the spatial grid to share the RB; reducing a power spectral density of the RB of the one or more terminal devices corresponding to the spatial grid; or reducing a quantity of RBs of the one or more terminal devices corresponding to the spatial grid.
14 . The apparatus according to claim 13 , wherein when scheduling the RB of the one or more terminal devices corresponding to the spatial grid, the programming instructions are for execution by the at least one processor to cause the apparatus to perform at least one of power back-off or beam gain suppression on a beam corresponding to the spatial grid.
15 . The apparatus according to claim 13 , wherein when reducing the quantity of RBs of the one or more terminal devices corresponding to the spatial grid, the programming instructions are for execution by the at least one processor to cause the apparatus to schedule RBs at an interval for the one or more terminal devices corresponding to the spatial grid.
16 . The apparatus according to claim 13 , wherein the programming instructions are for execution by the at least one processor to cause the apparatus to determine the transmit power corresponding to the spatial grid based on a sum of projected powers that are on the spatial grid and that are of power weight vectors corresponding to the one or more terminal devices communicating with the apparatus.
17 . The apparatus according to claim 13 , wherein the transmit power threshold corresponding to the spatial grid satisfies E=4πR 2 S, and wherein E is the transmit power threshold corresponding to the spatial grid, S is a power spectral density limit, and R is a safety distance corresponding to the spatial grid.
18 . The apparatus according to claim 13 , wherein the programming instructions are for execution by the at least one processor to cause the apparatus to perform spatial grid division based on an antenna pattern.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application is a continuation of International Application No. PCT/CN2021/119277, filed on Sep. 18, 2021, which claims priority to Chinese Patent Application No. 202011051583.2, filed on Sep. 29, 2020. The disclosures of the aforementioned applications are hereby incorporated by reference in their entireties. TECHNICAL FIELD Embodiments of this application relate to the field of communication technologies, and in particular, to a transmit power control method and apparatus. BACKGROUND Non-ionizing radiation (NIR) in an electromagnetic field (EMF) is harmful to organisms mainly in terms of a thermal effect, a non-thermal effect, a cumulative effect, and the like. To protect from the NIR, the International Commission on Non-Ionizing Radiation Protection (ICNIRP) specifies different power spectral density limits for different frequencies. A power spectral density refers to a power value per unit area. Currently, a network device performs extensive overall transmit power control on a cell, and transmit power utilization is not high. However, a value of a transmit power directly affects quality of a downlink channel, a received signal-to-noise ratio, and the like, and further affects a downlink throughput and user experience. In addition, with an increase in a bandwidth of a communication system, an increase in a quantity of users, and a higher requirement for low-latency real-time performance, there is an increasing demand for power resources, and a performance problem caused by insufficient power resources is further prominent. Therefore, a transmit power control solution is required, to improve the transmit power utilization of the network device, alleviate a problem of power resource limitation in a large-bandwidth multi-user scenario, improve performance of the downlink throughput, and meet a requirement for safety of radio wave electromagnetic radiation. SUMMARY Embodiments of this application provide a transmit power control method and apparatus, to resolve an existing problem that transmit power utilization is not high when a network device performs extensive overall transmit power control on a cell. According to a first aspect, this application provides a transmit power control method. The method includes: A network device determines a transmit power threshold corresponding to a spatial grid. The network device schedules a resource block RB or a carrier of one or more terminal devices corresponding to the spatial grid, to control a transmit power corresponding to the spatial grid to be less than or equal to the transmit power threshold corresponding to the spatial grid. Optionally, a quantity of spatial grids is N, and N is a positive integer greater than or equal to 2. According to the foregoing method, the network device may divide space into a plurality of spatial grids, and control, by using the spatial grid (an angle range) as a granularity, a transmit power corresponding to each spatial grid to not exceed a transmit power threshold corresponding to the spatial grid. In this way, a full transmit power can be achieved in each angle range, and transmit power utilization is improved, to avoid a problem in a conventional technology that transmit power utilization is not high when extensive overall transmit power control is performed on a cell, for example, transmit power control is performed based on a minimum safety distance for the entire cell. In a possible design, that the network device schedules an RB of one or more terminal devices corresponding to the spatial grid includes: The network device enables a plurality of terminal devices corresponding to the spatial grid to share the RB. Alternatively, the network device reduces a power spectral density of the RB of the one or more terminal devices corresponding to the spatial grid. Alternatively, the network device reduces a quantity of RBs of the one or more terminal devices corresponding to the spatial grid. That the network device reduces a quantity of RBs of the one or more terminal devices corresponding to the spatial grid includes: The network device schedules RBs at an interval for the one or more terminal devices corresponding to the spatial grid. In the foregoing design, when a transmit power corresponding to a spatial grid exceeds a transmit power threshold corresponding to the spatial grid, the network device may back off, in the foregoing plurality of RB scheduling manners, only the transmit power corresponding to the spatial grid, to avoid back-off of overall transmit powers of the cell. This helps improve the transmit power utilization. In a possible design, that the network device schedules an RB of one or more terminal devices corresponding to the spatial grid includes: The network device performs power back-off and/or beam gain suppression on a beam corresponding to the spatial grid. In the foregoing design, when a transmit power corresponding to a spatial grid exceeds a transmit power thr