Specific buffer-aided full duplex relaying over LTE advanced networks

Abstract

Full duplex relaying is an emerging technique to transmit and receive simultaneously at the same frequency for enhancing the attainable spectral efficiency in long term evolution advanced (LTE-A) network. The adoption of buffering over relay network outperforms and achieves better outage probability than the conventional relaying. In case of full duplex relaying (FDR) both transmission and reception are happening in same orthogonal channels, the increase in buffer length and higher delay deteriorates the system quality of service (QoS). To achieve both spectral efficiency and QoS, full duplex relay with the separate buffers for receiving and re-transmitting is proposed. The optimal trusted relay selection scheme is incorporated for maximising the security with effective signal-to-interference and noise ratio, which significantly improves the relaying transmission and further Tabu search-based metaheuristic algorithm is used for dealing with the trusted relay selection problem. The performance of three models, i.e., FDR without buffer-aided (conventional FDR), FDR with general buffer and FDR with specific buffer is investigated and compared in terms of outage probability and throughput. The simulation results revealed that the proposed FDR with specific buffer-aided scheme provides better performance compared with other FDR methods.