Patent ID: 8811147

Claim:
A method for allocating downlink transmission power of coordinated transmission devices in a coordinated multi-point transmission system, the method comprising: Step (S 10 ), the coordinated transmission devices receiving feedback, from a terminal, channel state information of sub-channels occupied by the terminal, wherein the channel state information includes channel phase information and channel amplitude information, and each of the coordinated transmission device is for providing wireless access for the terminal in the coordinated multi-point transmission system; Step (S 20 ), each of the coordinated transmission devices adjusts phases of its sending signals over its sub-channels respectively so as to make a phase difference of the sending signals, which are received by the terminal from the coordinated transmission devices via a same sub-channel, to be; and Step (S 30 ), each of the coordinated transmission devices determines its power allocation proportions for the sub-channels on the basis of feedback of channel amplitude information from the terminal and the adjusted phases of the sending signals, wherein, when a bit number of the feedback of the phase information of the sub-channels is zero, a power allocation proportions for the sub-channels of the coordinated transmission devices are determined by steps as follows: Step ( 321 ), each of the coordinated transmission devices performing equal power allocation on its sub-channels so as to determine its power allocation proportions for the sub-channels; Step ( 322 ), each of the coordinated transmission devices in turn determining their power allocation proportions for the sub-channels, on a basis of power allocation proportions for the sub-channels of other coordinated transmission devices before performing Step ( 322 ) this time, feedback of channel amplitude information from the terminal and an adjusted phase of sending signals; Step ( 323 ), for each of the coordinated transmission devices, determining whether its power allocation proportions satisfy a predefined convergence condition respectively, when all of the coordinated transmission devices satisfy the predefined convergence condition, Step (S 30 ) ends; otherwise, go back to Step ( 322 ) for performing next iteration.