Joint relay-pair selection for buffer-aided successive opportunistic relaying

In this work, we present a buffer-aided successive opportunistic relaying scheme that aims at improving the average capacity of the network when inter-relay interference arises between relays that are selected for simultaneous transmission and reception. We propose a relay selection policy that, by exploiting the benefits of buffering at the relays, decouples the receiving relay at the previous time slot to be the transmitting relay at the next slot. Furthermore, we impose an interference cancellation threshold allowing the relay that is selected for reception to decode and subtract the inter-relay interference. The proposed relaying scheme selects the relaying pair that maximises the average capacity of the relay network. Its performance is evaluated through simulations and comparisons with other state-of-the-art half-duplex and full-duplex relay selection schemes, in terms of outage probability, average capacity and average delay. The results reveal that a trade-off has to be made between improving the outage at the cost of reduced capacity and increased delay and vice versa. Finally, conclusions are drawn and future directions are discussed, including the need for a hybrid scheme incorporating both half-duplex and full-duplex characteristics. Copyright © 2013 John Wiley & Sons, Ltd. *Correspondence C. Skianis, Department of Information and Communication Systems Engineering, University of the Aegean, Karlovasi 83200, Samos, Greece. E-mail: [email protected] Preliminary results of this work have been presented as a conference paper at the Global Wireless Summit 2013 (GWS-2013). Received 19 March 2013; Revised 16 August 2013; Accepted 17 August 2013