Uplink transmit power determining method and terminal device

Patent metadata

Field	Value
Publication number	US-12075360-B2
Application number	US-202117402020-A
Country	US
Kind code	B2
Filing date	Aug 13, 2021
Priority date	Feb 15, 2019
Publication date	Aug 27, 2024
Grant date	Aug 27, 2024

Abstract

This application provides example uplink transmit power determining methods and example terminal devices. One example method includes receiving, by a terminal device, a broadcast message that is sent by an access network device and that carries first power control information, where the first power control information is used to determine a modulation and coding scheme (MCS) compensation factor. The terminal device can then determine the MCS compensation factor based on the first power control information. The terminal device can then determine a first candidate uplink transmit power based on the MCS compensation factor. The terminal device can then determine a smaller value in the first candidate uplink transmit power and a second candidate uplink transmit power as a physical uplink shared channel (PUSCH) transmit power. The terminal device can then send PUSCH information in a random access message based on the PUSCH transmit power.

First claim

What is claimed is:

1. An uplink transmit power determining method, comprising:
determining, by a communications apparatus, a power control adjustment amount, based on a type of physical uplink shared channel (PUSCH) information, wherein the type of the PUSCH information includes PUSCH information in a first-type retransmitted random access message and PUSCH information in a second-type retransmitted random access message, wherein the first-type retransmitted random access message carries PUSCH information without a random access preamble, and the second-type retransmitted random access message carries a random access preamble and PUSCH information;
determining, by the communications apparatus, a first candidate uplink transmit power based on the power control adjustment amount;
determining, by the communications apparatus, a smaller value in the first candidate uplink transmit power and a second candidate uplink transmit power as a PUSCH transmit power, wherein the second candidate uplink transmit power is determined based on a maximum transmit power supported by the communications apparatus; and
sending, by the communications apparatus, PUSCH information in a random access message based on the PUSCH transmit power.

2. The method according to claim 1 , wherein the method further comprises:
when the type of the PUSCH information is the PUSCH information in the first-type retransmitted random access message, determining, by the communications apparatus, the power control adjustment amount based on a random access preamble ramp power and a transmit power adjustment indication information carried in a random access response; or
when the type of the PUSCH information is the PUSCH information in the second-type retransmitted random access message, determining, by the communications apparatus, the power control adjustment amount based on the random access preamble ramp power; wherein
the random access preamble ramp power indicates a power that is increased for the random access preamble from an initial transmission to a previous transmission.

3. The method according to claim 2 , wherein the random access preamble ramp power is equal to a multiplication of a value on a random access preamble power ramping counter and a random access preamble power ramp step.

4. The method according to claim 3 , wherein
when a first beam for a (N+1) th random access preamble transmission is same as a second beam for a N th random access preamble transmission, a first quantity of power ramping times of the random access preamble power ramping counter is a second quantity of power ramping times of the random access preamble power ramping counter corresponding to the N th random access preamble transmission plus one; or
when the first beam for the (N+1) th random access preamble transmission is different from the second beam for the N th random access preamble transmission, the first quantity of power ramping times of the random access preamble power ramping counter is same as the second quantity of power ramping times of the random access preamble power ramping counter corresponding to the N th random access preamble transmission.

5. The method according to claim 1 , wherein the method further comprises:
when the type of the PUSCH information is the PUSCH information in the first-type retransmitted random access message, determining, by the communications apparatus, the power control adjustment amount according to a first formula; or
when the type of the PUSCH information is the PUSCH information in the second-type retransmitted random access message, determining, by the communications apparatus, the power control adjustment amount according to a second formula; wherein
the first formula is different from the second formula.

6. The method according to claim 1 , wherein when the type of the PUSCH information is the PUSCH information in the second-type retransmitted random access message, the method further comprises:
determining, by the communications apparatus, the power control adjustment amount based on a following formula:

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Assignees

• Huawei Tech Co Ltd

Inventors

• Zhang Lei
• Wu Yiqun
• Gong Zhengwei
• Chen Yan

Classifications

• H04W52/367

  Power values between minimum and maximum limits, e.g. dynamic range · CPC title

• H04W74/004

  in the uplink, i.e. towards network · CPC title

• H04W52/50

  at the moment of starting communication in a multiple access environment · CPC title

• H04W52/327

  Power control of multicast channels · CPC title

• H04W52/262

  taking into account adaptive modulation and coding [AMC] scheme · CPC title