Joint Social, Energy and Buffer to Select Relay in Relay-Aided D2D Communications

摘要

Device-to-device (D2D) communications is conceived as an effective technique to improve the performance on overall throughput and enhance system capacity in cellular networks. However, it is hard to establish a reliable direct transmission link when there is a long distance between source user device (SUD) and destination user device (DUD). Thus, it is necessary to take advantage of Relay-assisted D2D communications to solve the problem. In this paper, a relay selection method is proposed to improve the performance of D2D communications. Firstly, the success probability of transmission and the average transmission delay between SUD and DUD in one-hop D2D communications are derived. Secondly, a relay selection mathematical utility model is formed which jointly considers the interest similarity among users, the surplus energy, buffer state of candidate relay users, and the channel condition in each communication phase. Finally, a relay selection strategy is proposed which selects the link with the maximum utility for data transmission. Simulation results demonstrate the effectiveness of the proposed scheme.