Green Heterogeneous Wireless Networks

Chapter 8Greening the Cell Edges

Heterogeneous networks (HetNets) are envisioned to enable the next-generation cellular networks with higher spectral and energy efficiency. This chapter presents a two-tier HetNet, where small-cell BSs (SBSs) are arranged around the edge of the reference macro-cell such that the resultant configuration is referred to as cell-on-edge (COE). Each mobile user in a small-cell is considered to be capable of adapting its uplink transmission power according to a location-based slow power control (PC) mechanism. The COE configuration is observed to increase the uplink area spectral efficiency (ASE) and energy efficiency, while reducing the co-channel interference power. A moment-generating function (MGF)-based approach is presented to derive the analytical bounds on the uplink ASE of the COE configuration. The derived expressions are generalized to any composite fading distribution and closed-form expressions are presented for the generalized- fading channels. Simulation results are included to support the analysis and show the spectral and energy efficiency improvements of the COE configuration. A comparative performance analysis is also provided to demonstrate the improvement in the performance of cell-edge users of the COE configuration compared to macro-only networks and other unplanned deployment strategies. Moreover, the COE deployment guarantees ...