Threshold Based Relay Selection Protocol for Wireless Relay Networks with Interference

In cooperative wireless networks, relay selection plays a significant role in the system performance. In this paper, with the presence of interferences, we firstly propose two relay selection protocols according to the forms of the interferences. Then considering that the interference caused by the selected relay has an effect on other transmissions, a threshold based relay selection protocol is proposed to select one best relay forwarding the message, where the interference caused by the selected relay is below than a predetermined threshold. Furthermore, in the proposed protocols, all the relays and the destination are subject to the interferences from other transmissions. The exact outage probabilities for the protocols are derived over the Rayleigh fading channels. Finally, simulation results validate our analysis,and show that our proposed relay selection protocols are better than the available relay selection protocols in terms of outage probability.