针对无线Ad Hoc嘲络不能区分数据流优先级的问题,提出一种基千802.11DCF退避算法的改进机制,该机制通过减少高优先级数据流的MAC层重传次数,使发送高优先级数据流(如实时数据流)的节点更容易连接信道,高优先级数据流占有更多带宽资源,从而减少传输时延.分析结果表明,该算法能有效提高高优先级数据流的传输性能.%Aiming at the problem that wireless Ad Hoc networks can not provide any priority scheme, this paper proposes a proved mechanism based on 802.11DCF back-off algorithm. The new mechanism, by reducing the retransmission number of high-priority data flows at the data link layer, can make high-priority data flow(such as Real-time data flow) access channel more easily, the high-priority data flow can obtain more bandwidth, and the average end-to-end delay is reduced as well. Analysis results show that the new algorithm can improve the transmission performance of data flows in high priority significantly.
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