Relay assisted cellular system for energy minimization

Relay assisted cellular system is a promising infrastructure redesign to enhance the performance of wireless systems. The use of intermediate nodes to relay information from source to destination can be efficient in eliminating black spots, extending coverage region, improving fairness in terms of capacity spread over the cell, saving power by reducing overall transmission and prolonging battery lifetime of user. This paper investigates the power saving potential of Fixed Relay Station (FRS). The basic essence of utilizing a FRS is to reduce the transmit power requirement of mobile station (MS). We assume that each wireless route includes at most one FRS. Results of theoretical analysis and computer simulation of relay assisted cellular network show more than 50% (4 to 5dB) saving in energy consumption for pathloss index of 4. Further the effects of intercell interference in a twohop cellular network is investigated in this paper. Simulation results of Long Term Evolution-Advanced (LTE-A) Urban Macro scenario with inband relays show that even after energy minimization the Signal to Interference noise ratio (SINR) of a twohop cellular network is comparable to that of a traditional cellular network.