Energy efficiency based on relay station deployment and sleep mode activation of eNBs for 4G LTE-A network

The energy efficiency is considered as a major issue due to large power consumption of eNBs in heterogeneous cellular networks. In this paper, a novel relay station (RS) deployment scheme and base station (BS) sleep mode algorithm is proposed to minimize the power consumption of eNBs. The relay stations are deployed to cover the entire transmission area of a cell to provide service when the eNBs are in sleep mode. The network traffic of each cell is considered with Erlang B and C probability measure and sleep mode is activated for eNBs, during the low network traffic intervals which reduces the total power consumption. The network traffic is estimated for each RSs also and the RS without MU association becomes sleep mode in order to reduce power consumption further. The simulation results of proposed work and when it compared with the existing network shows good saving in power consumption. An intra-cell BS-RS handover scheme for our work is also described in this paper. The evaluation results show the efficiency of our proposed work.