Energy efficient power allocation and backhaul design in heterogeneous small cell networks

Energy-efficient power allocation and wireless backhaul bandwidth allocation are studied for orthogonal frequency division multiple access heterogeneous small cell networks. Different from the existing resource allocation schemes that maximize the throughput, the studied scheme maximizes energy efficiency by allocating both transmit power of each small cell to users and bandwidth for backhauling, according to the channel state information and the circuit power consumption. The problem is formulated as a non-convex nonlinear programming problem which is then decomposed into two convex subproblems. A near optimal iterative resource allocation algorithm is designed to solve the resource allocation problem. We also develop a suboptimal but low-complexity approach by fixing bandwidth allocation factor. Simulation results demonstrate the effectiveness of the proposed algorithm.