Multi-user cooperative diversity for energy conservation in green mobile networks

In recent years, green communication has been studied as a promising technology to conserve energy consumption, reduce radio emission and ensure sustainable development of wireless communication systems. A green mobile network will be integrated with the state-of-art advanced wireless networking technologies to fulfill end-to-end green communications. Cooperative communication has been widely utilized to significantly improve system performance and decrease power consumption. In this paper, we utilize cooperative relay to conserve energy consumption in green mobile networks. The relay selection and power allocation are investigated. The theoretical analysis is carried out under different number of cooperative users. We derive the explicit expression of energy consumption for the Amplify-and-Forward (AF) protocol with multiuser diversity. Simulation results demonstrate that the proposed relay selection and power allocation schemes significantly reduce energy consumption in green mobile networks.