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中文摘要：
针对无线传感器网络不能提供数据流优先级区分的问题，提出了一种基于IEEE802．11MAC协议的改进机制。该机制通过引入新的控制分组，使目的节点可以拒绝接收来自低优先级节点的数据，从而确保了高优先级数据业务的服务质量。数学分析表明，该机制能够使高优先级数据流占用更多的带宽，并且降低了高优先级数据流的分组丢弃概率。能耗分析表明，高优先级数据业务能耗低于低优先级数据业务，随着节点密度的增加，该机制节能效果逐渐明显，适合于节点密度高的无线传感器网络。
英文摘要：
Considering that IEEE802.11 wireless sensor networks can not provide any priority scheme, this paper proposes a new scheme based on the 802.11 MAC protocol. The main idea is that, by introducing new types of control frames, receiving nodes may refuse to accept data of low-priority nodes. As a result, the QoS of high-priority data flow is effectively improved. Our mathematical analyses demonstrate that the new mechanism can make the high-priority data flow obtain more bandwidth, and frame dropping probability. Through performance analysis and simulation, the result shows that the energy efficient of high-priority data flow is lower than one of low-priority data flow, especially the energy efficient of the improved MAC protocol is obvious along with the increasing sensor density gradually.
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