Adhoc网络双忙音多址访问协议的研究与仿真磁

摘要

由于移动Ad hoc网络没有固定控制中心，信道访问冲突十分严重。论文通过对双忙音多址访问（DBTMA）协议的仿真，发现当网络中存在暴露接收节点时，DBTMA协议出现了严重的不公平性问题，有些节点甚至可以垄断信道。论文提出了一种针对DBTMA协议不足进行改进的策略，该策略通过设计一种基于竞争节点数目的自适应竞争窗口调整因子，以达到根据网络竞争状况动态调整退避窗口的目的。仿真结果表明，改进后的DBTMA协议有效地解决了原协议存在的不公平性问题。%Channel access conflict is very serious as mobile Ad hoc network has no fixed control center .By emulating dual busy tone multiple access(DBTMA) protocol ,it is found that when there is receiving node in the network ,DBTMA a‐greement appeared a serious problem of unfairness ,some node can even monopolize the channel .An improve strategy is pro‐posed in this paper aiming at the shtorage if the DBTMA protocol .By designing a kind of adaptive contention window adju‐ment factor based on the number of node ,in order to adjust the backoff window according to dynamic network competition . The simulation results show that the improved DBTMA agreement effectively solve the unfairness problem exists in orginal agrement .