Energy Efficient Performance Analysis of Downlink CoMP with BSs Switch-Off in Heterogeneous Wireless Network

Abstract

In CoMP, simultaneous transmission from several neighboring base stations (BS) in heterogeneous network can exploit the interference to enhance system performance. Simultaneously, participation of several BSs will also increase the energy consumption of network. Therefore, this technique needs to be analyzed properly for energy saving, especially for heterogeneous scenario, where different BSs have different characteristics. In this paper, we have analyzed the performance of wireless system in heterogeneous environment without and with CoMP in terms of outage probability and energy efficiency by changing coverage range. Switching under loaded base stations (BSs) to off is considered as a promising approach to reduce energy consumption of cellular networks, but it may increase the transmit power of remaining active BSs to guarantee service coverage. CoMP can reduce transmit power of BSs through BS cooperation but requiring extra power consumption due to extra signal processing and backhaul traffic. In this paper, we also investigate the energy efficiency of BS switching off combined with CoMP without increasing the transmit powers of the active cells.