Optimal Energy Saving Through Joint Deployment of Relay Station and Sleep Mode Activation in 4G LTE-A Network

The advancement of information and communication technology (ICT) facilitates high-speed data rate centric real-time applications including streaming of video and instant chat. More number of macrobase stations (BSs) are required to accommodate fast growing number of users which constitute for a radical increase in energy consumption of the network. In order to mitigate this problem, a sleep mode algorithm for evolved NodeB (eNBs) of LTE-A networks with simultaneously powering relay stations (RSs) is the key trends in 4G networks. The sleep mode algorithm for base station is mathematically modeled with set theory. In proposed system model, each eNB is interconnected through X2 links and with RSs deployed in the transmission areas of selected eNB. The real-time network traffic of base station is estimated by a two-way handshake process between eNBs and mobile station. The control server (CS) is placed in the selected eNB which will decide to activate the sleep mode for RSs and eNB based on the estimated real-time network traffic profile. The comparison of optimal power consumption of BSs with RS is extensively simulated. The performance of sleep mode algorithm considering temporal variations of real-time network traffic is validated on hourly based scenario using MATLAB R2013a. The simulation results of the proposed work prove that there is an enormous power saving per eNB per hour. This proposed scheme is well suited for suburban area with temporal variations of network traffic.