IP Library › Granted Patent US 12,477,481

Granted Patent B2

US 12,477,481 · App. 18/343,755 · Granted Nov 18, 2025

Power determining method, apparatus, and system

Inventor: Mao Yan (Chengdu, CN)

Assignee: HUAWEI TECHNOLOGIES CO., LTD.

H04W52/367 H04W74/0833 H04W74/0836 H04W74/0838

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Quick Facts

Patent No.: US 12,477,481
App. No.: 18/343,755
Granted: Nov 18, 2025
Kind: B2

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Abstract

Embodiments of this application provide a power determining method, an apparatus, and a system, to resolve a problem of how to determine transmit power of sending a plurality of random access preambles. The method includes: determining first transmit power of N random access preambles to be sent to a network device, where the first transmit power is related to a quantity N of the random access preambles, and N is an integer greater than 1; and sending the N random access preambles to the network device at the first transmit power. This application is applicable to the field of communication technologies.

Claims (117)

1 . A power determining method, wherein the method comprises:

determining a first transmit power of N random access preambles to be sent to a network device,

wherein the first transmit power is based on the quantity N of the random-access preambles, and N is an integer greater than 1; and

sending the N random access preambles to the network device at the first transmit power,

wherein the first transmit power satisfies one of the following relationships:

P PRACH,b,f,c ( i )=min{ P CMAX,f,c ( i ), P PRACH,target,f,c +Δ( N )+PL b,f,c } [dBm], wherein

P PRACH,b,f,c (i) represents the transmit power; P CMAX,f,c (i) represents maximum transmit power allowed by the terminal device; P PRACH,target,f,c represents preamble received target power; PL b,f,c represents a path loss estimated by the terminal device; Δ(N) represents a power offset, and P PRACH,target,f,c satisfies the following relationship:

P RACH,target,f,c =preambleReceivedTargetPower+DELTA_PREAMBLE+(PREAMBLE_POWER_RAMPING_COUNTER−1)×PREAMBLE_POWER_RAMPING_STEP+POWER_OFFSET_2STEP_RA, wherein

preambleReceivedTargetPower represents initial preamble received target power;

DELTA_PREAMBLE represents a power offset corresponding to a random-access preamble format;

PREAMBLE_POWER_RAMPING_COUNTER represents a quantity of preamble power ramping times;

PREAMBLE_POWER_RAMPING_STEP represents a preamble power ramping step; and

POWER_OFFSET_2STEP_RA represents a power difference between two-step random access and four-step random access,

P PRACH,b,f,c ( i )=min{ P CMAX,f,c ( i ), P PRACH,target,f,c +PL b,f,c } [dBm], wherein

P PRACH,b,f,c (i) represents the first transmit power; P CMAX,f,c (i) represents maximum transmit power allowed by the terminal device; P PRACH,target,f,c represents preamble received target power; PL b,f,c represents a path loss estimated by the terminal device; and P PRACH,target,f,c satisfies the following relationship:

P RACH,target,f,c =preambleReceivedTargetPower+Δ( N )+DELTA_PREAMBLE+(PREAMBLE_POWER_RAMPING_COUNTER−1)×PREAMBLE_POWER_RAMPING_STEP+POWER_OFFSET_2STEP_RA, wherein

preamble ReceivedTargetPower represents initial preamble received target power;

DELTA_PREAMBLE represents a power offset corresponding to a random-access preamble format;

PREAMBLE_POWER_RAMPING_COUNTER represents a quantity of preamble power ramping times;

PREAMBLE_POWER_RAMPING_STEP represents a preamble power ramping step;

Δ(N) represents a power offset; and POWER_OFFSET_2STEP_RA represents a power difference between two-step random access and four-step random access,

P PRACH,b,f,c ( i )=min{ P CMAX,f,c ( i ), P PRACH,target,f,c +PL b,f,c } [dBm], wherein

P RACH,target,f,c =preambleReceivedTargetPower+DELTA_PREAMBLE+(PREAMBLE_POWER_RAMPING_COUNTER−1)×PREAMBLE_POWER_RAMPING_STEP+POWER_OFFSET_2STEP_RA, wherein

preamble ReceivedTargetPower represents initial preamble received target power;

DELTA_PREAMBLE represents a power offset corresponding to a random-access preamble format;

PREAMBLE_POWER_RAMPING_COUNTER represents a quantity of preamble power ramping times;

PREAMBLE_POWER_RAMPING_STEP represents a preamble power ramping step;

POWER_OFFSET_2STEP_RA represents a power difference between two-step random access and four-step random access; and DELTA_PREAMBLE is determined based on Δ(N), and Δ(N) represents a power offset.

2 . The method according to claim 1 , wherein that the first transmit power is based on the quantity N of the random-access preambles comprises:

the first transmit power is determined based on the power offset Δ(N) determined based on the quantity N of the random-access preambles.

3 . The method according to claim 2 , wherein the power offset Δ(N) satisfies the following relationship:

Δ( N )=10 log 10 ( N ), where log 10 ( N ) represents a logarithm of N to base 10;

Δ( N )=└10 log 10 ( N )┘, where └ ┘ represents rounding down;

Δ( N )=┌10 log 10 ( N )┐, where ┌ ┐ represents rounding up;

Δ( N )=round(10 log 10 ( N )), where round represents rounding off;

Δ( N )=−10 log 10 ( N );

Δ( N )=−└10 log 10 ( N )┘, where └ ┘ represents rounding down;

Δ( N )=−┌10 log 10 ( N )┐, where ┌ ┐ represents rounding up; or

Δ( N )=−round(10 log 10 ( N )), where round represents rounding off.

4 . The method according to claim 1 , wherein the first transmit power determined based on a sending manner of the N random access preambles.

5 . The method according to claim 4 , wherein the sending manner of the N random access preambles comprises:

the N random access preambles correspond to a same random access channel occasion (RO);

the N random access preambles correspond to a same random access time domain resource and different random access frequency domain resources; or

the N random access preambles correspond to different random access time domain resources.

6 . A power determining method, wherein the method comprises:

determining a first transmit power of N random access preambles to be sent to a network device,

wherein the first transmit power is based on a transmit power parameter corresponding to the N random access preambles, and N is an integer greater than 1;

sending the N random access preambles to the network device at the first transmit power multiple times, wherein:

each time the N random access preambles are sent,

a quantity of preamble power ramping times corresponding to the N random access preambles is increased by X1,

wherein X1 is a positive integer greater than 1; or

the quantity of preamble power ramping times corresponding to the N random access preambles is determined based on a sending manner of the N random access preambles.

7 . The method according to claim 6 , wherein the transmit power parameter corresponding to the N random access preambles comprises at least one of the following:

the quantity of preamble power ramping times corresponding to the N random access preambles;

a quantity of preamble transmission times corresponding to the N random access preambles;

initial preamble received target power corresponding to the N random access preambles;

a preamble power ramping step corresponding to the N random access preambles; or

a difference between a power ramping step corresponding to the N random access preambles and a power ramping step corresponding to a single random-access preamble.

8 . The method according to claim 6 , wherein that the quantity of preamble power ramping times corresponding to the N random access preambles is determined based on the sending manner of the N random access preambles comprises:

each time the N random access preambles are sent in a first manner, the quantity of preamble power ramping times corresponding to the N random access preambles is increased by X2; and each time the N random access preambles are sent in a second manner, the quantity of preamble power ramping times corresponding to the N random access preambles is increased by 1, wherein X2 is a positive integer greater than 1.

9 . The method according to claim 8 , wherein the first manner comprises: the N random access preambles correspond to a same random access channel occasion (RO); or the N random access preambles correspond to a same random access time domain resource and different random access frequency domain resources; and the second manner comprises: the N random access preambles correspond to different random access time domain resources; or

the first manner comprises: the N random access preambles correspond to different random access time domain resources; and the second manner comprises: the N random access preambles correspond to a same RO; or the N random access preambles correspond to a same random access time domain resource and different random access frequency domain resources.

10 . The method according to claim 6 , wherein the first transmit power is determined based on the sending manner of the N random access preambles.

11 . The method according to claim 6 , wherein the sending manner of the N random access preambles comprises:

the N random access preambles correspond to the same RO;

the N random access preambles correspond to the same random access time domain resource and the different random access frequency domain resources; or

the N random access preambles correspond to the different random access time domain resources.

12 . A communication apparatus, wherein the communication apparatus comprises a processor and a transceiver;

the processor is configured to determine first transmit power of N random access preambles to be sent to a network device,

wherein the first transmit power is based on the quantity N of the random-access preambles, and N is an integer greater than 1; and

the transceiver is configured to send the N random access preambles to the network device at the first transmit power;