Abstract:

In order to implement the complex spectrum management in multi- relay channel accesses for distributedwireless cooperative networks,an improved algorithm based on the DTR protocol is proposed,which selects the bestrelay node offering cooperation based on the local game,thus avoiding the large delay due to the backoff or collisioncaused by the random access in the DTR protocol.Moreover,in this algorithm,each source controls its standard ofaccessing channel with threshold scheme adaptively,and the information between relay and source nodes is locally exchanged,thus substituting the centralized control mode for the best relay selection of base station or AP and exten-ding the algorithm to distributed systems.As compared with the backoff and collision transmission in DTR protocol,the proposed algorithm results in less communication overhead.Analytical and simulated results show that the pro-posed algorithm is superior to the traditional DTR- based algorithm because it helps to reduce the average end- to- enddelay and increase the system throughput without significantly increasing the network overhead.

Key words: cooperative network, random channel access, local game, threshold scheme, delay