A method of reporting power headroom, wherein the method comprises: determining, by a user equipment for which a plurality of serving cells controlled by different network side apparatuses are aggregated, power headroom information; and transmitting, by the user equipment, the power headroom information to the different network side apparatuses aggregated for the user equipment via one of the following schemes: scheme 1: transmitting, by the user equipment, the power headroom information of all the activated serving cells controlled by all of the different network side apparatuses to one of the network side apparatuses aggregated for the user equipment, wherein the power headroom information received by the one network side apparatus is forwarded to other network side apparatuses; scheme 2: transmitting, by the user equipment, the power headroom information of all the activated serving cells controlled by all of the different network side apparatuses to each of the network side apparatuses aggregated for the user equipment; and, scheme 3: transmitting, by the user equipment, the power headroom information of all the activated serving cells controlled by each of the network side apparatuses respectively to the corresponding network side apparatus. determining, by a user equipment for which a plurality of serving cells controlled by different network side apparatuses are aggregated, power headroom information; and transmitting, by the user equipment, the power headroom information to the different network side apparatuses aggregated for the user equipment via one of the following schemes: scheme 1: transmitting, by the user equipment, the power headroom information of all the activated serving cells controlled by all of the different network side apparatuses to one of the network side apparatuses aggregated for the user equipment, wherein the power headroom information received by the one network side apparatus is forwarded to other network side apparatuses; scheme 2: transmitting, by the user equipment, the power headroom information of all the activated serving cells controlled by all of the different network side apparatuses to each of the network side apparatuses aggregated for the user equipment; and, scheme 3: transmitting, by the user equipment, the power headroom information of all the activated serving cells controlled by each of the network side apparatuses respectively to the corresponding network side apparatus. scheme 1: transmitting, by the user equipment, the power headroom information of all the activated serving cells controlled by all of the different network side apparatuses to one of the network side apparatuses aggregated for the user equipment, wherein the power headroom information received by the one network side apparatus is forwarded to other network side apparatuses; scheme 2: transmitting, by the user equipment, the power headroom information of all the activated serving cells controlled by all of the different network side apparatuses to each of the network side apparatuses aggregated for the user equipment; and, scheme 3: transmitting, by the user equipment, the power headroom information of all the activated serving cells controlled by each of the network side apparatuses respectively to the corresponding network side apparatus.