Joint Power and Spectrum Allocation for Relay Stations in Mobile Relay Networks

Abstract

Mobile phones are among the most popular consumer devices with the recent development of 4G networks. The ubiquity of mobile phones have resulted in increasing capacity demands and extended more and more pressures on the limited spectrum resources (Lin and Liu, IEEE T Image Process 21(5):2667–2680, 2012). Recently, relay communications with the aid of Relay Stations (RSs) have emerged as a solution to improve transmission rate between the Base Station (BS) and Mobile Station (MS). In this paper, we investigate the joint power and spectrum allocation for RSs in mobile relay networks. We first study the joint power and spectrum allocation for RSs without individual power constraint and propose an optimal power and spectrum allocation strategy. The scenario with individual power constraint is further explored. We prove that all selected RSs should adjust the transmission power in a descending order according to the channel gain, and for the selected RSs with full power allocation, the optimal spectrum allocation is proportional to the channel gain. The theoretical results obtained are instrumental to the future mobile relay network modeling and design.