中文摘要：

在簇形结构的无线传感器网络中，针对基本单元簇，在IEEE802．15．4协议的MAC层讨论查询质量的优化问题。建立了以查询质量为目标，带宽限制为约束条件的优化模型，并提出了动态规划法和查询质量因子动态更新算法相结合的动态查询质量保证算法。仿真实验表明，该方法能提高IEEE802．15．4的实时带宽利用率，减少查询响应时间．并能根据不同的查询质量要求提供相应的服务。

英文摘要：

From the point of view of MAC layer definition in IEEE802.15.4,a query quality optimization problem in a cluster-based wireless sensor network is discussed.An optimization model is presented,whose objective is to maximize the quality of query, subject to the bandwidth limitations.Combining the dynamic program method and dynamic quality of query factor updating algorithm,a Dynamic Query Quality Guaranteed（DQQG） algorithm is proposed.The simulation results show that I）QQG algorithm can improve the real-time bandwidth utility and decrease the query response time. Additionally it can provide corresponding query services according to the different service demands.