Ad Hoc网络中基于DRMR协议的拥塞控制方案

近年来，Ad hoc网络的组播路由协议研究受到广泛关注，但在大规模应用之前必须解决拥塞控制问题.目前已经提出了许多组播路由协议，其中动态广播环组播路由协议（DRMR）在降低控制开销的基础上，能够取得较好的分组递交率和扩展性,但DRMR没有考虑大数据量时的拥塞控制策略，本文提出了DRMR协议上的拥塞控制方案，包括拥塞检测、反馈通知和速率控制一套完整的拥塞控制机制，给出了各参数的计算公式和算法,最后，利用NS2仿真软件对扩充的DRMR协议进行仿真，结果表明，扩充的DRMR协议较好地保证了在高负载下的服务质量．

Congestion Control Method Based on DRMR in Ad Hoc Network

Recently,the research of multicast routing protocol for the Ad hoc networks receives more attention to widely.But the problem of the congestion control must be solved before the large-scale deployment of multicast protocol.A number of multicast protocols for the Ad hoc networks have been proposed,Dynamic Ring based Multicast Routing protocol(DRMR)which is one of them,has a high data packet delivery ratio and low control overhead.But the congestion control does not be included in DRMR.In this paper,a solution of congestion control based on DRMR is presented,including congestion detection,feedback and sending packet rate controlling.The calculating formula of the control parameter and the algorithm of controlling are also given.The performances of the extended DRMR are simulated and evaluated with NS2.The results show that the extended DRMR assures preferably the quality of service in the situation of heavy load.