Method for determining transmit power and user equipment

• US 9,832,742 B2
• Filed: 12/13/2016
• Issued: 11/28/2017
• Est. Priority Date: 06/13/2014
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Jin, Hui, Shen, Li, Li, Zhe, Tang, Nengfu
• Primary Examiner(s): Lee, John J
• Application Number:
  US15/377,342
• Publication Number:
  US 20170094613A1
• Time in Patent Office: 350 Days
• Field of Search: 455522, 455 69, 4554521, 455509
• CPC Class Codes: H04W 52/00 Power management, e.g. TPC [Transmission Power Control], power saving or power classes gain control in transmitters or power amplifiers H03G3/3042
• CPC Class Codes: H04W 52/06 TPC algorithms
• CPC Class Codes: H04W 52/242 taking into account path loss
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

The present disclosure discloses a method for determining transmit power and a user equipment, which relates to the field of information technologies, and can improve a success rate of establishing a connection between the user equipment and a base station. The method includes: determining, according to a preconfigured rule, a transmit power used for sending a random access message; and, sending the random access message to a base station by using the determined transmit power. The present disclosure is applicable to establishment of the connection between the user equipment and the base station.

Claims

1. A method for determining a transmit power, comprising:

determining by a processor included in a user equipment, according to a preconfigured rule, a transmit power used for sending a random access message; and

sending, by the processor included in the user equipment, the random access message to a base station by using the transmit power,

wherein the determining, according to the preconfigured rule, the transmit power used for sending the random access message comprises determining a minimum value of;

a maximum transmit power value, and

a value computed based on an initial transmit power and an added value of transmit power for sending the random access message two consecutive times in a process of a current round of a random access attempt.

2. The method according to claim 1, wherein the determining, according to the preconfigured rule, the transmit power used for sending the random access message comprises:

determining, according to P={P_MAX P_{initial value} (N_pre−

1)*Δ

P_rampup (N−

1)*P_compensation}, the transmit power used for sending the random access message, wherein P_compensation is compensation power, P is the transmit power used for sending the random access message, P_MAX is a maximum transmit power, P_{initial value} is an initial transmit power, Δ

P_rampup is an added value of transmit power for sending the random access message two consecutive times in a process of a current round of a random access attempt, N_pre a quantity of times for sending the random access message in the process of the current round of the random access attempt, N_pre is integer greater than or equal to 1 and less than or equal to N_{pre max}, N_{pre max} is a maximum quantity of attempts in the process of the current round of the random access attempt, N is a quantity of attempt rounds for the random access message, and N is an integer greater than or equal to 1.

3. The method according to claim 2, wherein P_compensation is preconfigured;

and

before the determining, according to P=min {P_MAX, P_{initial value}+(N_pre−

1)*Δ

P_rampup+(N−

1)*P_compensation}, the transmit power used for sending the random access message, the method further comprises;

acquiring P_compensation from a nonvolatile entry.

4. The method according to claim 2, wherein before the determining, according to P=min {P_MAX, P_{initial value}+(N_pre−

1)*Δ

P_rampup+(N−

1)*P_compensation} the transmit power used for sending the random access message, the method further comprises;

determining P_compensation, wherein determining P_compensation comprises;

determining P_compensation according to P_compensation=P_MAX−

[P_{initial value}+(N_{pre max}−

1)*Δ

P_rampup], wherein P_MAX≧

P_{initial value}+(N_{pre max}−

1)*Δ

P_rampup;

or

determining P_compensation according to P_compensation=P_MAX−

[P_{initial value}+(N_{pre max}−

X)*Δ

P_rampup], wherein P_MAX≧

P_{initial value}+(N_{pre max}−

1)*Δ

P_rampup, and X is a quantity of times for sending according to the maximum transmit power in the process of the current round of the random access attempt.

5. The method according to claim 2, wherein P_{initial value} is determined according to P_{initial value}=PL+P_{o_pre}+Δ

_pre, wherein PL is a downlink path loss, P_{o_pre} is initial target receive power for a preamble code carried in the random access message, and Δ

_pre is a format offset of the preamble code.

6. The method according to claim 1, wherein the determining, according to the preconfigured rule, the transmit power used for sending the random access message comprises:

determining, according to P=min{P_MAX, P_{inital value}+(N_pre−

1)*[Δ

P_rampup+(N−

1)*(N_pre−

1)*P_{step compensation}]}, the transmit power used for sending the random access message, wherein P_{step compensation} is step compensation power, P is the transmit power used for sending the random access message, P_MAX is a maximum transmit power, P_{initial value} is an initial transmit power, Δ

P_rampup is an added value of transmit power for sending the random access message two consecutive times in a process of a current round of a random access attempt, N_pre is a quantity of times for sending the random access message in the process of the current round of the random access attempt, N_pre is an integer greater than or equal to 1 and less than or equal to N_{pre max}, N_{pre max} is a maximum quantity of attempts in the process of the current round of the random access attempt, N is a quantity of attempt rounds for the random access message, and N is an integer greater than or equal to 1.

7. The method according to claim 6, wherein P_{step compensation} is preconfigured;

and

before the determining, according to P=min{P_MAX, P_{initial value}+(N_pre−

1)*[Δ

P_rampup+(N−

1)*(N_pre−

1)*P_{step compensation}]}, the transmit power used for sending the random access message, the method further comprises;

acquiring P_{step compensation} from a nonvolatile entry.

8. The method according to claim 6, wherein before the determining, according to P=min {P_MAX, P_{intial value}+(N_pre−

1)*[Δ

P_rampup+(N−

1)*(N_pre−

1)*P_{step compensation}]}, the transmit power used for sending the random access message, the method further comprises;

determining P_{step copensation}, wherein determining P_{step compensation} comprises;

determining P_{step compensation} according to P_{step compensation}={P_MAX−

[P_{initial value}+(N_{pre max}−

1)*Δ

P_rampup]}/(N_{pre max}−

1) wherein P_MAX≧

P_{initial value}+(N_{pre max}−

1)*Δ

P_rampup;

or

determining P_{step compensation} according to P_{step compensation} {P_MAX [P_{initial value}+(N_{pre max}−

X)*Δ

P_rampup]}/(N_{pre max}−

X), wherein P_MAX≧

P_{initial value}+(N_{pre max}−

1)*Δ

P_rampup and X is a quantity of times for sending according to the maximum transmit power in the process of the current round of the random access attempt.

9. The method according to claim 1, wherein the determining, according to the preconfigured rule, the transmit power used for sending the random access message comprises:

determining, according to P=min {P_MAX, P_{initial value}+PL*(N−

1)*X_PL+(N_pre−

1)*Δ

P_rampup} the transmit power used for sending the random access message, wherein X_PL is a path loss compensation coefficient, P is the transmit power used for sending the random access message, P_MAX is a maximum transmit power, P_{initial value} is an initial transmit power, Δ

P_rampup is an added value of transmit power for sending the random access message two consecutive times in a process of a current round of a random access attempt, N_pre is a quantity of times for sending the random access message in the process of the current round of the random access attempt, N_pre is integer greater than or equal to 1 and less than or equal to N_{pre max}, N_{pre max} is a maximum quantity of attempts in the process of the current round of the random access attempt, N is a quantity of attempt rounds for the random access message, and N is an integer greater than or equal to 1.

10. The method according to claim 1, wherein the determining, according to the preconfigured rule, the transmit power used for sending the random access message comprises:

determining, according to P=min {P_MAX, P_{initial value}+(N_pre−

1)*[Δ

P_rampup+Δ

P_rampup*(N−

1)*X<sub>Δ

P</sub>]}, the transmit power used for sending the random access message, wherein X<sub>Δ

P</sub> is a step compensation coefficient, P is the transmit power used for sending the random access message, P_MAX is a maximum transmit power, P_{initial value} is an initial transmit power, Δ

P_rampup is an added value of transmit power for sending the random access message two consecutive times in a process of a current round of a random access attempt, N_pre is a quantity of times for sending the random access message in the process of the current round of the random access attempt, N_pre is an integer greater than or equal to 1 and less than or equal to N_{pre max}, N_{pre max} is a maximum quantity of attempts in the process of the current round of the random access attempt, N is a quantity of attempt rounds for the random access message, and N is an integer greater than or equal to 1.

11. A user equipment, comprising:

a processor, configured to determine, according to a preconfigured rule, a transmit power used for sending a random access message; and

a transceiver, configured to send the random access message to a base station by using the transmit power determined by the processor,

wherein the processor is configured to determine, according to the preconfigured rule, the transmit power used for sending the random access message based on determining a minimum value of;

a maximum transmit power value, and

a value computed based on an initial transmit power and an added value of transmit power for sending the random access message two consecutive times in a process of a current round of a random access attempt.

12. The user equipment according to claim 11, wherein

the processor is configured to determine, according to P=min {P_MAX, P_{initial value}+(N_pre−

1)*Δ

P_rampup+(N−

1)*P_compensation}, the transmit power used for sending the random access message, wherein P_compensation is compensation power, P is the transmit power used for sending the random access message, P_MAX is a maximum transmit power, P_{initial value} is an initial transmit power, Δ

P_rampup is an added value of transmit power for sending the random access message two consecutive times in a process of a current round of a random access attempt, N_pre is a quantity of times for sending the random access message in the process of the current round of the random access attempt, N_pre is an integer greater than or equal to 1 and less than or equal to N_{pre max}, N_{pre max} is a maximum quantity of attempts in the process of the current round of the random access attempt, N is a quantity of attempt rounds for the random access message, and N is an integer greater than or equal to 1.

13. The user equipment according to claim 12, wherein

P_compensation is preconfigured;

and

P_compensation acquired by the processor from a nonvolatile entry.

14. The user equipment according to claim 12, wherein

P_compensation determined by the processor according to P_compensation=P_MAX−

[P_{initial value}+(N_{pre max}−

1)*Δ

P_rampup], wherein P_MAX≧

P_{initial value}+(N_{pre max}−

1)*Δ

P_rampup;

or

P_compensation determined by the processor according to P_compensation=P_MAX−

[P_{initial value}+(N_{pre max}−

X)*Δ

_rampup], wherein P_MAX≧

P_{initial value}+(N_{pre max}−

1)*Δ

P_rampup, and X is a quantity of times for sending according to the maximum transmit power in the process of the current round of the random access attempt.

15. The user equipment according to claim 11, wherein

the processor is configured to determine, according to P=min {P_MAX, P_{initial value}+PL*(N−

1)*X_PL+(N_pre−

1)*Δ

P_rampup}, the transmit power used for sending the random access message, wherein X_PL is a path loss compensation coefficient, P is the transmit power used for sending the random access message, P_MAX is a maximum transmit power, P_{initial value} is an initial transmit power, Δ

P_rampup is an added value of transmit power for sending the random access message two consecutive times in a process of a current round of a random access attempt, N_pre is a quantity of times for sending the random access message in the process of the current round of the random access attempt, N_pre is integer greater than or equal to 1 and less than or equal to N_{pre max}, N_{pre max} is a maximum quantity of attempts in the process of the current round of the random access attempt, N is a quantity of attempt rounds for the random access message, and N is an integer greater than or equal to 1.

16. The user equipment according to claim 12, wherein P_{initial value} is determined by the processor according to P_{initial value}=PL+P_{o_pre}+Δ

_pre, wherein PL is a downlink path loss, P_{o_pre} is initial target receive power for a preamble code carried in the random access message, and Δ

_pre is a format offset of the preamble code.

17. The user equipment according to claim 11, wherein

the processor is configured to determine, according to P=min {P_MAX, P_{initial value}+(N_pre−

1)*[Δ

P_rampup+(N−

1)*(N_pre−

1)*P_compensation]}, the transmit power used for sending the random access message, wherein P_{step compensation} is step compensation power, P is the transmit power used for sending the random access message, P_MAX is a maximum transmit power, P_{initial value} is an initial transmit power, Δ

P_rampup is an added value of transmit power for sending the random access message two consecutive times in a process of a current round of a random access attempt, N_pre is a quantity of times for sending the random access message in the process of the current round of the random access attempt, N_pre is an integer greater than or equal to 1 and less than or equal to N_{pre max}, N_{pre max} is a maximum quantity of attempts in the process of the current round of the random access attempt, N is a quantity of attempt rounds for the random access message, and N is an integer greater than or equal to 1.

18. The user equipment according to claim 17, wherein P_{step compensation} is preconfigured;

and

P_{step compensation} is acquired by the processor from a nonvolatile entry.

19. The user equipment according to claim 17, wherein

P_compensation is determined by the processor according to P_compensation={P_MAX−

[P_{initial value}+(N_{pre max}−

1)*Δ

P_rampup]}/(N_{pre max}−

1), wherein P_MAX≧

P_{intial value}+(N_{pre max}−

1)*Δ

P_rampup;

or

P_{step compensation} determined by the processor according to P_{step compensation}={P_MAX−

[P_{initial value}+(N_{pre max}−

X)*Δ

P_rampup]}/(N_{pre max}−

X), wherein P_MAX≧

P_{initial value}+(N_{pre max}−

1)*Δ

P_rampup, and X is a quantity of times for sending according to the maximum transmit power in the process of the current round of the random access attempt.

20. The user equipment according to claim 11, wherein

the processor is configured to determine, according to P=min{P_MAX, P_{initial value}+(N_pre−

1)*[Δ

P_rampup+Δ

P_rampup*(N−

1)*X<sub>Δ

P</sub>]}, the transmit power used for sending the random access message, wherein X<sub>Δ

P</sub> is a step compensation coefficient, P is the transmit power used for sending the random access message, P_MAX is a maximum transmit power, P_{initial value} is an initial transmit power, Δ

P_rampup is an added value of transmit power for sending the random access message two consecutive times in a process of a current round of a random access attempt, N_pre a quantity of times for sending the random access message in the process of the current round of the random access attempt, N_pre is an integer greater than or equal to 1 and less than or equal to N_{pre max}, N_{pre max} is a maximum quantity of attempts in the process of the current round of the random access attempt, N is a quantity of attempt rounds for the random access message, and N is an integer greater than or equal to 1.