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

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 , G 1 , I_psd_ 2 , and G 2 , wherein G 1 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, G 2 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:

α1= G 1/( I _ psd _1*γ1)

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:

α2= G 2/( I _ psd _2*γ2)

wherein α 2 is the second channel gain reference quantity, and γ2 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:

P 1= P 1_min= P 01 *(1−γ1)/ G 1

wherein P 1 is the power of the first carrier signal, P 1 _min is a power corresponding to a minimum bit error ratio that meets transmission of the first carrier signal, and P 01 is an expected power value of the first carrier signal; and

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

P 2= P _ ue _max− P 1

wherein P 2 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:

P 1= P 2· P _ ue _max/2

wherein P 1 is the power of the first carrier signal, P 2 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, G 1 , I_psd_ 2 , and G 2 , wherein G 1 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, G 2 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:

α1= G 1/( I _ psd _1*γ1)

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:

α2= G 2/( I _ psd _2*γ2)

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:

P 1= P 1_min= P 01 *(1−γ1)/ G 1

wherein P 1 is the power of the first carrier signal, P 1 _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:

P 2= P _ ue _max− P 1

wherein P 2 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:

P 1= P 2= P _ ue _max/2

wherein P 1 is the power of the first carrier signal, P 2 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.