Distributed Opportunistic Channel Access in Wireless Relay Networks
In this paper, the problem of distributed opportunistic channel access in wireless relaying is investigated. A relay network with multiple source-destination pairs and multiple relays is considered. All source nodes contend through a random access procedure. A winner source may give up its transmission opportunity if its link quality is poor. In this paper, the authors apply the optimal stopping theory to analyze when a winner source should give up its transmission opportunity. By assuming the winner source has Channel State Information (CSI) of links from itself to relays and from relays to its destination, the existence of an optimal stopping strategy is rigorously proved. The optimal stopping strategy has a pure-threshold structure.