基于WMN的链路质量测量方案与路由尺度性能研究

无线网格网（WMN）骨干网的静态特性与Ad Hoc的动态特性完全不同，所以把Ad Hoc路由协议移植到WMN上并不适用。因而出现了为类似的静态无线网络开发的多波链路质量源路由协议MR LQSR。该协议是链路质量源路由协议（LQSR）协议与累积权期望传输时间（WCETT）的结合。WCETT作为链路质量尺度，必须能够精确反映真实的链路质量。为了尽可能在系统容量损耗和链路质量衡量方式的精确性间做一个折中，将更精确的链路质量测量技术EAR引用到ETT的计算中，以此来提高WCETT参数的准确性并提高MR LQSR的性能。最后的仿真结果表明，该方案在降低系统容量损耗的同时，对链路质量测量的精确性有一定的提高。

Study on routing metric and accurate measurement of link quality in wireless mesh network

The routing technology based on Ad Hoc was introduced into Wireless Mesh Network (WMN) as the default routing standard described in IEEE 802.11s. But the backbone of WMN is different from Ad Hoc, the topology of WMN is more static than that of Ad Hoc. MR LQSR developed for relatively static WMN, combining the LQSR and WCETT, shows the better performance for WMN than pure routing of Ad Hoc. WCETT is the link-quality metric. An efficient and accurate measurement (EAR) for wireless link-quality was proposed. Accurate link-quality measurement is essential to the routing performance associated with link-quality-awareness routing protocol in WMN. The link-quality factors, such as link bandwidth and loss rate were discussed, and the utilization of link capacity improved by EAR was evaluated. The simulation results show that ETT and ETX with EAR significantly outperform original ETT&ETX with BAP.