Social-Aware Relay Selection Scheme for Relay-Based D2D Communications

In order to improve the communication quality of relay-based D2D communication, this paper proposed a relay selection algorithm with the consideration of the information of the social domain and the physical domain. First, the transmission performance of D2D relay communication in the half-duplex relay mode and the full-duplex relay mode is analyzed separately in the physical domain. Second, we analyzed the user’s history check-in information to obtain the characteristics of user’s mobility and the social relationship strength between users. Finally, we proposed a relay communication gain metric to measure the extent of transmission performance improvement brought by D2D relay communication and developed a relay selection algorithm for maximizing the relay communication gain. The simulation results show that compared with the traditional D2D relay communication scheme, the transmission rate and stability of the transmission link of the D2D relay communication system using the proposed algorithm are greatly improved.