中文摘要：

针对Ad Hoc网络中,IEEE 802.11协议存在数据碰撞,导致网络性能大幅下降的问题,提出基于隐式Markov链概率分析模型的竞争窗口约乘退避策略。给出分布式碰撞延缓协调功能协议的隐式马尔可夫链模型及其退避状态转换过程设计。针对二进制指数等传统退避策略未考虑实时数据传输情况的问题,分情况考虑信道空闲和繁忙情况的数据传输躲避状态转换,降低数据碰撞概率,从理论上给出传输概率推导过程。仿真结果表明,所提算法相较对比算法具有更好的网络服务质量。

英文摘要：

In Ad Hoc networks, the data collision exists in the IEEE 802.11 protocol, resulting in network performance decline, so the backoff strategy of contention window based on hidden Markov chain probabilities analysis model was proposed. The distributed collision delay coordinate protocol based on the hidden Markov chain model was presented, and the backoff state con- version process was designed. The binary exponential backoff and other traditional backoff strategy fail to consider the real-time data transmission, to address this problem, considering whether the channel was idle or busy, and avoiding the state transition, the probability of data collision was reduced, and the derivation of the theory of transmission probability was given. Experimental results show the proposed algorithm has better quality of network service compared with other methods.