1. A method for reporting power headroom, comprising the following steps:
judging whether power headroom reporting (PHR) is triggered by a user equipment;
If PHR is triggered, said user equipment reporting power headroom independently or associatively based on component carrier CC or power amplifier PA;
wherein, before said user equipment judging whether PHR is triggered, further comprising:
a base station equipment configuring PHR-related parameters for each CC or PA, and informing said PHR-related parameters to said user equipment;
Said user equipment judging whether power headroom reporting is triggered, comprising:
Said user equipment judging whether there is any PHR trigger condition is satisfied according to the PHR-related parameters configured for CC or PA.', 'judging whether power headroom reporting (PHR) is triggered by a user equipment;', 'If PHR is triggered, said user equipment reporting power headroom independently or associatively based on component carrier CC or power amplifier PA;', 'wherein, before said user equipment judging whether PHR is triggered, further comprising:', 'a base station equipment configuring PHR-related parameters for each CC or PA, and informing said PHR-related parameters to said user equipment;', 'Said user equipment judging whether power headroom reporting is triggered, comprising:', 'Said user equipment judging whether there is any PHR trigger condition is satisfied according to the PHR-related parameters configured for CC or PA.

2. The method according to claim 1, wherein, said PHR-related parameters are included in radio resource control signaling.

3. The method according to claim 1, wherein, said PHR-related parameters comprise at least one of the following:
The period of periodicPHR-Timer, the length of prohibitPHR-Timer, and the dl-Pathloss Change parameter for triggering PHR.', 'The period of periodicPHR-Timer, the length of prohibitPHR-Timer, and the dl-Pathloss Change parameter for triggering PHR.

4. The method according to claim 3, wherein, said the trigger conditions comprising at least one of the following:
ProhibitPHR-Timer expires or has expired and the path loss has changed more than dl -PathlossChange dB since the last transmission of a PHR when the UE has UL resources for new transmission;
ProhibitPHR-Timer expires;
upon initial configuration or reconfiguration of the power headroom reporting functionality by upper layers.', 'ProhibitPHR-Timer expires or has expired and the path loss has changed more than dl -PathlossChange dB since the last transmission of a PHR when the UE has UL resources for new transmission;', 'ProhibitPHR-Timer expires;', 'upon initial configuration or reconfiguration of the power headroom reporting functionality by upper layers.

5. The method according to claim 4, wherein, when said user equipment judging whether there is any trigger condition is satisfied according to the PHR-related parameters configured for PA, the pathloss change from the most recent PHR comprising at least one of the following:
The average pathloss change of all CCs supported by said PA, the greatest pathloss change amongst all CCs supported by said PA, the smallest pathloss change amongst all CCs supported by said PA, and the pathloss change of the primary carrier defined for the said PA.', 'The average pathloss change of all CCs supported by said PA, the greatest pathloss change amongst all CCs supported by said PA, the smallest pathloss change amongst all CCs supported by said PA, and the pathloss change of the primary carrier defined for the said PA.

6. The method according to claim 1, wherein, said user equipment reporting power headroom independently based on CC, comprising:
Said user equipment confirming the uplink resources indicated by UL grant in said CC can accommodate said PHR, calculating the power headroom PH value of said CC, generating PHR media access control element MAC CE according to said PH value, and sending said PHR MAC CE in said uplink resources indicated by UL grant of said CC which can accommodate said PHR.', 'Said user equipment confirming the uplink resources indicated by UL grant in said CC can accommodate said PHR, calculating the power headroom PH value of said CC, generating PHR media access control element MAC CE according to said PH value, and sending said PHR MAC CE in said uplink resources indicated by UL grant of said CC which can accommodate said PHR.

7. The method according to claim 6, wherein, said PH value is calculated in reference to at least one of the following:
The maximum transmitting power of said CC, maximum transmitting power of PA which includes said CC, and maximum transmitting power of said user equipment.', 'The maximum transmitting power of said CC, maximum transmitting power of PA which includes said CC, and maximum transmitting power of said user equipment.

8. The method according to claim 7, wherein, when said PH value is calculated according to the maximum transmitting power of said CC, before said user equipment reporting power headroom independently or associatively based on CC, further comprising:
Said base station equipment distributing power between CC supported by said PA according to maximum transmitting power of PA, informing said maximum transmitting power of each CC to said user equipment, said maximum transmitting power of each CC is included in control signaling, said control signaling includes RRC signaling or L1/L2 signaling.', 'Said base station equipment distributing power between CC supported by said PA according to maximum transmitting power of PA, informing said maximum transmitting power of each CC to said user equipment, said maximum transmitting power of each CC is included in control signaling, said control signaling includes RRC signaling or L1/L2 signaling.

9. The method according to claim 1, wherein, said user equipment reporting power headroom associatively based on CC, comprising:
Said user equipment confirming the uplink resources indicated by UL grant of said CC, which can accommodate PHR of all CC, calculating PH value of all CC, generating PHR MAC CE according to said PH value, and sending said PHR MAC CE in said uplink resources indicated by UL grant in any said CC which can accommodate said PHR.', 'Said user equipment confirming the uplink resources indicated by UL grant of said CC, which can accommodate PHR of all CC, calculating PH value of all CC, generating PHR MAC CE according to said PH value, and sending said PHR MAC CE in said uplink resources indicated by UL grant in any said CC which can accommodate said PHR

10. The method according to claim 1, wherein, said user equipment reporting power headroom independently based on PA, comprising:
Said user equipment confirming the uplink resources, which is indicated by UL grant in said CC supported by said PA, can accommodate said PHR, calculating PH value in said PA, generating PHR MAC CE according to said PH value, and sending said PHR MAC CE in said uplink resources indicated by UL grant of said CC which can accommodate said PHR.', 'Said user equipment confirming the uplink resources, which is indicated by UL grant in said CC supported by said PA, can accommodate said PHR, calculating PH value in said PA, generating PHR MAC CE according to said PH value, and sending said PHR MAC CE in said uplink resources indicated by UL grant of said CC which can accommodate said PHR

11. The method according to claim 10, wherein, said PH value is calculated according to the maximum transmitting power of PA

12. The method according to claim 1, wherein, said user equipment reporting power headroom associatively based on PA, comprising:
Said user equipment confirming the uplink resources indicated by UL grant of said CC can accommodate PHR of all PA, calculating PH value for all PA, generating PHR MAC CE according to said PH value, and sending said PHR MAC CE in said uplink resources indicated by UL grant in any said CC which can accommodate said PHR.', 'Said user equipment confirming the uplink resources indicated by UL grant of said CC can accommodate PHR of all PA, calculating PH value for all PA, generating PHR MAC CE according to said PH value, and sending said PHR MAC CE in said uplink resources indicated by UL grant in any said CC which can accommodate said PHR.13. A user equipment, comprising:
A judging module, is used for judging whether power headroom reporting PHR is triggered;
A reporting module, is used for reporting power headroom independently or associatively based on component carrier CC or power amplifier PA, when said judging module judging triggering PHR;
wherein, said judging module is specifically used for judging whether there is any PHR trigger condition is satisfied according to the PHR-related s parameters configured in CC or PA.', 'A judging module, is used for judging whether power headroom reporting PHR is triggered;', 'A reporting module, is used for reporting power headroom independently or associatively based on component carrier CC or power amplifier PA, when said judging module judging triggering PHR;', 'wherein, said judging module is specifically used for judging whether there is any PHR trigger condition is satisfied according to the PHR-related s parameters configured in CC or PA.14. The user equipment according to claim 13, wherein, when said reporting module reporting power headroom independently based on CC, is specifically used for judging whether the uplink resources indicated by UL grant in said CC can accommodate said PHR, if so, calculating the power headroom PH value in said CC, generating PHR media access control element MAC CE according to said PH value, and sending said PHR MAC CE in said uplink resources indicated by UL grant of said CC which can accommodate said PHR.15. The user equipment according to claim 13, wherein, when said reporting module reporting power headroom associatively based on CC, is specifically used for judging whether the uplink resources indicated by UL grant of said CC can accommodate PHR of all CC, if so, calculating PH value in all CC, generating PHR MAC CE according to said PH value, and sending said PHR MAC CE in said uplink resources indicated by UL grant in any said CC which can accommodate said PHR.16. The user equipment according to claim 13, wherein, when said reporting module reporting power headroom independently based on PA, is specifically used for judging whether the uplink resources indicated by UL grant in said CC supported by said PA can accommodate said PHR, if so, calculating PH value in said PA, generating PHR MAC CE according to said PH value, and sending said PHR MAC CE in said uplink resources indicated by UL grant of said CC which can accommodate said PHR.17. The user equipment according to claim 13, wherein, when said reporting module reporting power headroom associatively based on PA, is specifically used for judging whether the uplink resources indicated by UL grant of said CC can accommodate PHR of all PA, if so, calculating PH value for all PA, generating PHR MAC CE according to said PH value, and sending said PHR MAC CE in said uplink resources indicated by UL grant in any said CC which is accommodate said PHR.18. A system for reporting power headroom, comprising a user equipment of claim 13 and a base station equipment, said system cell uplink includes at least two component carrier CC, said user equipment includes at least one power amplifier PA, wherein,
Said base station equipment, is used for configuring PHR-related parameters for each CC or PA, and informing said PHR-related parameters to said user equipment by radio resource control RRC signaling;
Said user equipment, is used for judging whether power headroom reporting PHR is triggered, when trigging PHR, reporting power headroom independently or associatively based on CC or PA.', 'Said base station equipment, is used for configuring PHR-related parameters for each CC or PA, and informing said PHR-related parameters to said user equipment by radio resource control RRC signaling;', 'Said user equipment, is used for judging whether power headroom reporting PHR is triggered, when trigging PHR, reporting power headroom independently or associatively based on CC or PA.']