Proposed an adaptive backoff algorithm which is based on congestion avoidance over Binary Exponential Backoff. The new algorithm introduces NTS frame which transmitter can reject the transmission request. It will also piggyback the congestion status of receiver to transmitter, based on the congestion status transmitter will adjust the backoff parameters adaptively. The purpose of above two approaches is trying to protect the QoS parameters of high priority data flow over wireless mesh networks. The simulation result shows that the new backoff mechanism will improve QoS parameters of high priority data flow significantly.%本文在二进制指数退避算法基础上提出一种基于拥塞避免的自适应退避算法.该算法引入了拒绝帧NTS,使接收节点具有拒绝发送节点发送请求的能力;另外通过将接收节点的拥塞状况反馈到发送节点,使发送节点可以根据自身待发送数据流的QoS属性和接收节点的拥塞状况自适应地调整退避参数,最终实现对高优先级数据流的保护.仿真结果表明,该算法能有效地保护高优先级数据流的端到端吞吐量、减小其分组重传次数以及分组时延,从而达到提高系统性能的目的.
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