Achieving energy-efficiency in two-tiers wireless backhaul HetNets
We consider a model of two-tier heterogeneous cellular networks (HetNets), with wireless backhaul communication (WBC), consisting of a macrocell and a small cell tiers. A joint design of transmit beamforming, power allocation and bandwidth partitioning for both uplink (UL) and downlink (DL) transmissions is considered in this work. By proposing a strategy to partition the bandwidth for two consecutive time slots by two separate partitioning factors, we formulate a constrained optimization problem with the objective of maximizing the total energy efficiency of the small cells considering both UL and DL. For this non-convex problem, we leverage the sequential parametric convex approximation (SPCA) method to develop an efficient iterative algorithm to find the local optimal solution. Numerical simulations corroborate the convergence of our proposed algorithm and their performance gains compared to the previous work.