协作网络中基于DTR协议的改进算法

Improved Algorithm Based on DTR Protocol in Cooperative Networks

针对分布式无线协作网络中多中继接入信道的复杂频谱管理问题,提出了一种基于DTR协议的改进算法.该算法采取局部博弈的方式选择单个接入信道的中继节点,避免了DTR协议中随机接入带来的大量退避或碰撞时延消耗;同时,采用门限策略灵活控制接入信道的标准和中继与源节点局部交互信息的方式,取代了基站或AP选择最优中继的集中式控制,使算法适用于分布式网络,所需通信开销也远小于退避或碰撞传输所付出的代价.分析与仿真结果表明,在未明显增加网络开销的情况下,新算法在减少端到端平均传输时延和改善系统吞吐量方面比传统DTR算法具有更优异的性能.

In order to implement the complex spectrum management in multi-relay channel accesses for distributed wireless cooperative networks,an improved algorithm based on the DTR protocol is proposed,which selects the best relay node offering cooperation based on the local game,thus avoiding the large delay due to the backoff or collision caused by the random access in the DTR protocol.Moreover,in this algorithm,each source controls its standard of accessing 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-end delay and increase the system throughput without significantly increasing the network overhead.