Abstract: In view of the minimum node energy，the energy-consumption on path，delay and channel error in wireless sensor networks，the paper adopts QoS routing to provide the differentiated services for both real-time traffic and best-effort traffic and it is the key technology to provide differential services and utilize the whole resource effectively for wireless sensor networks.At the precondition of ensuring the QoS request such as reliability，a new distributed QoS routing algorithm according to“the minimum node energies on path / the path’s consumption” and “minimum hop counts” has been proposed by extending Directed Diffusion.Based on the analysis of result about the simulation，both the reliability of the two traffics is achieved，furthermore the new routing protocol balances the energy-cost of wireless sensor networks greatly.

Key words: wireless sensor network, QoS routing, reliability, best effort, real time

摘要： 综合考虑无线传感器网络的路径节点最小能量、路径能耗、延迟、信道错误率等因素，采用QoS路由对不同的查询业务实现区分服务。通过对传统的定向扩散路由算法的扩展，在保证业务可靠性要求的前提下，组合利用“路径节点最小能量/路径能耗”和“最小跳数”信息，提出了一种针对尽力而为业务和实时业务的QoS路由算法。仿真结果表明，扩展后的算法能满足业务的可靠性要求，随信道错误率的增加，它能更好地均衡网络各节点的能耗。

关键词: 无线传感器网络, QoS路由, 可靠性, 尽力而为, 实时