Power allocation for CoMP system with backhaul limitation

Coordinated multipoint (CoMP) is proposed recently as a promising technique to improve the performance of cellular networks and meet the increasing demand for digital service. However it faces several constraints to perform CoMP scheme in real systems. In this paper, we consider a downlink CoMP system and formulate the resource allocation problem of it in terms of resource block (RB) scheduling and power allocation (PA) under the constraints of both transmit power at each transmit point (TP) and backhaul capacity. Combining with existing scheduling methods, we propose a PA algorithm to solve the formulated problem. The proposed PA method decouples the problem into independent sub-problems in order to reduce the involved variables. Then, to further reduce the computation, suboptimal solutions are approached instead of the optimal ones. Simulation results verify that the proposed algorithm is able to improve the network throughput and save transmit power of TPs with reasonable computational complexity.