Method for controlling power of carrier signal, user equipment, and base station

• US 10,251,135 B2
• Filed: 11/08/2016
• Issued: 04/02/2019
• Est. Priority Date: 05/09/2014
• 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: Wu, Tong, Li, Hong, Li, Anjian, Cui, Jie
• Primary Examiner(s): Tran, Phuc H
• Application Number:
  US15/346,196
• Publication Number:
  US 20170055227A1
• Time in Patent Office: 875 Days
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/242 taking into account path loss
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/267 taking into account the information rate
• CPC Class Codes: H04W 52/281 taking into account user or data type priority
• CPC Class Codes: H04W 52/34 TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 76/15 Setup of multiple wireless link connections

Abstract

Embodiments of the present invention provide a method for controlling power of a carrier signal, user equipment, and a base station. The method includes: receiving, by user equipment, power control parameters, sent by at least one base station, of at least two carrier signals, where the at least two carrier signals are signals sent on at least two aggregation carriers; determining, by the user equipment according to the power control parameters, channel gain reference quantities corresponding to the at least two carrier signals, where the channel gain reference quantities are used to represent a magnitude of a channel gain; and controlling, by the user equipment, power of the at least two carrier signals according to the channel gain reference quantities. According to the technical solutions of the present invention, a power resource of user equipment can be effectively utilized, and network performance can be improved.

Claims

1. A method for controlling power, comprising:

receiving, by a user equipment, power control parameters, from at least one base station, of at least two carrier signals, wherein the at least two carrier signals are signals carried on at least two aggregation carriers;

determining, by the user equipment according to the power control parameters, channel gain reference quantities corresponding to the at least two carrier signals, to represent a magnitude of a channel gain according to a comparison of the channel gain reference quantities; and

controlling, by the user equipment, power of the at least two carrier signals according to the magnitude of the channel gain.

2. The method according to claim 1, before the determining, by the user equipment according to the power control parameters, channel gain reference quantities corresponding to the at least two carrier signals, further comprising:

determining, by the user equipment, that a sum of the power of the at least two carrier signals is greater than a maximum transmit power supported by the user equipment.

3. The method according to claim 1, wherein the controlling, by the user equipment, power of the at least two carrier signals according to the magnitude of the channel gain comprises:

determining, by the user equipment, a carrier signal among the at last two carrier signals corresponding to a minimum channel gain reference quantity; and

determining, by the user equipment, a power corresponding to a minimum bit error ratio that meets transmission of the carrier signal as a power of the carrier signal.

4. The method according to claim 1, wherein the at least one base station comprises a primary base station, the at least two carrier signals comprise a first carrier signal and a second carrier signal, and the receiving, by user equipment, power control parameters comprises:

receiving, by the user equipment, a power control parameter of the first carrier signal and a power control parameter of the second carrier signal that are sent by the primary base station, wherein

the power control parameter of the first carrier signal and the power control parameter of the second carrier signal are determined by the primary base station, or

the power control parameter of the first carrier signal is determined by the primary base station, and the power control parameter of the second carrier signal is determined by a secondary base station and is sent to the primary base station.

5. The method according to claim 1, wherein the at least one base station comprises a primary base station and a secondary base station, the at least two carrier signals comprise a first carrier signal and a second carrier signal, and the receiving, by user equipment, power control parameters comprises:

receiving, by the user equipment, a power control parameter, sent by the primary base station, of the first carrier signal; and

receiving, by the user equipment, a power control parameter, sent by the secondary base station, of the second carrier signal.

6. The method according to claim 1, wherein the channel gain reference quantities corresponding to the at least two carrier signals comprise a first channel gain reference quantity corresponding to the first carrier signal and a second channel gain reference quantity corresponding to the second carrier signal;

the power control parameters comprise I_psd_1, G1, I_psd_2, and G2, wherein G1 is a first path loss from the user equipment to the base station, I_psd_1 is an interference power spectrum of the user equipment on a first carrier frequency, G2 is a second path loss from the user equipment to the base station, and I_psd_2 is an interference power spectrum of the user equipment on a second carrier frequency; and

the determining, by the user equipment according to the power control parameters, channel gain reference quantities corresponding to the at least two carrier signals comprises;

determining, by the user equipment, the first channel gain reference quantity according to the following formula;

α

1=G1/(I_psd_1*γ

1)

wherein α

1 is the first channel gain reference quantity, and γ

1 is a first bit error ratio that meets transmission of the first carrier signal; and

determining, by the user equipment, the second channel gain reference quantity according to the following formula;

α

2=G2/(I_psd_2*γ

2)

wherein α

2 is the second channel gain reference quantity, and γ

2 is a second bit error ratio that meets transmission of the second carrier signal.

7. The method according to claim 6, wherein the controlling, by the user equipment, power of the at least two carrier signals according to the magnitude of the channel gain comprises:

determining that the first channel gain reference quantity is less than the second channel gain reference quantity;

determining a power of the first carrier signal according to the following formula;

P1=P1_min=P₀₁*(1−

γ

1)/G1

wherein P1 is the power of the first carrier signal, P1_min is a power corresponding to a minimum bit error ratio that meets transmission of the first carrier signal, and P₀₁ is an expected power value of the first carrier signal; and

determining a power of the second carrier signal according to the following formula;

P2=P_ue_max−

P1

wherein P2 is the power of the second carrier signal, and P_ue_max is the maximum transmit power supported by the user equipment.

8. The method according to claim 6, wherein the controlling, by the user equipment, power of the at least two carrier signals according to the magnitude of the channel gain comprises:

determining that the first channel gain reference quantity is equal to the second channel gain reference quantity; and

determining a power of the first carrier signal and a power of the second carrier signal according to the following formula;

P1=P2·

P_ue_max/2

wherein P1 is the power of the first carrier signal, P2 is the power of the second carrier signal, and P_ue_max is the maximum transmit power supported by the user equipment.

9. The method according to claim 1, wherein the at least two carrier signals are carrier signals of different radio access technology.

10. A user equipment, comprising:

a transceiver to receive power control parameters, from at least one base station, of at least two carrier signals, wherein the at least two carrier signals are signals sent on at least two aggregation carriers;

a processor to,

determine, according to the power control parameters, channel gain reference quantities corresponding to the at least two carrier signals to represent a magnitude of a channel gain according to a comparison of the channel gain reference quantities; and

control power of the at least two carrier signals according a comparison of to the magnitude of the channel gain.

11. The user equipment according to claim 10, wherein:

the processor is to determine that a sum of the power of the at least two carrier signals is greater than a maximum transmit power supported by the user equipment.

12. The user equipment according to claim 10, wherein to control the power of the at least two carrier signals, the processor determines a carrier signal among the at least two carrier signals corresponding to a minimum channel gain reference quantity, and determines a power corresponding to a minimum bit error ratio that meets transmission of the carrier signal as a power of the carrier signal.

13. The user equipment according to claim 10, wherein the at least one base station comprises a primary base station, the at least two carrier signals comprise a first carrier signal and a second carrier signal, and

the transceiver is to receive a power control parameter of the first carrier signal and a power control parameter of the second carrier signal that are sent by the primary base station, wherein

the power control parameter of the first carrier signal and the power control parameter of the second carrier signal are determined by the primary base station, or

the power control parameter of the first carrier signal is determined by the primary base station, and the power control parameter of the second carrier signal is determined by a secondary base station and is sent to the primary base station.

14. The user equipment according to claim 10, wherein the at least one base station comprises a primary base station and a secondary base station, the at least two carrier signals comprise a first carrier signal and a second carrier signal, and

the transceiver is to receive a power control parameter, sent by the primary base station, of the first carrier signal, and receive a power control parameter sent by the secondary base station, of the second carrier signal.

15. The user equipment according to claim 10, wherein the channel gain reference quantities corresponding to the at least two carrier signals comprise a first channel gain reference quantity corresponding to the first carrier signal and a second channel gain reference quantity corresponding to the second carrier signal;

the power control parameters comprise I_psd_1, G1, I_psd_2, and G2, wherein G1 is a first path loss from the user equipment to the base station, I_psd_1 is an interference power spectrum of the user equipment on a first carrier frequency, G2 is a second path loss from the user equipment to the base station, and I_psd_2 is an interference power spectrum of the user equipment on a second carrier frequency;

the processor determines the first channel gain reference quantity according to the following formula;

α

1=G1/(I_psd_1*γ

1)

wherein α

1 is the first channel gain reference quantity, and γ

1 is a first bit error ratio that meets transmission of the first carrier signal; and

the processor determines the second channel gain reference quantity according to the following formula;

α

2=G2/(I_psd_2*γ

2)

wherein α

2 is the second channel gain reference quantity, and γ

2 is a second bit error ratio that meets transmission of the second carrier signal.

16. The user equipment according to claim 15, wherein to control the power of the at least two carrier signals, the processor determines that the first channel gain reference quantity is less than the second channel gain reference quantity;

determines a power of the first carrier signal according to the following formula;

P1=P1_min=P₀₁*(1−

γ

1)/G1

wherein P1 is the power of the first carrier signal, P1_min is a power corresponding to a minimum bit error ratio that meets transmission of the first carrier signal, and Poi is an expected power value of the first carrier signal; and

determines a power of the second carrier signal according to the following formula;

P2=P_ue_max−

P1

wherein P2 is the power of the second carrier signal, and P_ue_max is the maximum transmit power supported by the user equipment.

17. The user equipment according to claim 15, wherein to control the power of the at least two carrier signals, the processor determines that the first channel gain reference quantity is equal to the second channel gain reference quantity, and determines a power of the first carrier signal and a power of the second carrier signal according to the following formula:

P1=P2=P_ue_max/2

wherein P1 is the power of the first carrier signal, P2 is the power of the second carrier signal, and P_ue_max is the maximum transmit power supported by the user equipment.

18. The user equipment according to claim 10, wherein the at least two carrier signals are carrier signals of different radio access technology.

19. A base station, comprising:

a processor to determine a power control parameter of at least one carrier signal of at least two carrier signals, wherein the at least two carrier signals are signals sent on at least two aggregation carriers; and

a transceiver to send the power control parameter of the at least one carrier signal to a user equipment (UE), wherein the power control parameter of the at least one carrier signal comprises at least an interference power spectrum corresponding to the at least one carrier signal, to control the UE to determine channel gain reference quantities corresponding to the at least two carrier signals to perform a comparison of the channel gain reference quantities to represent a magnitude of the channel gain used to control power of the at least two carrier signals.

20. The base station according to claim 19, wherein the at least two carrier signals comprise a first carrier signal and a second carrier signal, the power control parameter of the at least one carrier signal comprises a power control parameter of the first carrier signal and a power control parameter of the second carrier signal, and

the processor is to determine the power control parameter of the first carrier signal, and receive the power control parameter, from a second base station, of the second carrier signal.