基于IEEE802.11s的多射频多信道无线mesh网络路由判据的探究

Research on Multi-radio Multi-channel Wireless Mesh Networks routing metrics based in IEEE 802.11s

无线mesh网络是下一代无线网络技术中人们研究与关注的热点技术之一。根据最新IEEE 802.11s协议,其路由判据是基于无线感知的空时链路判据(airtime link metric,ALM)。这种路由判据比传统的以跳数作为判据要好,但是当多信道或多射频条件下时,这种判据会引起信道容量的衰减,不足以满足如今的网络需求。因此,有许多新的路由判据被提出。例如,加权累计期望传输时间,干扰及信道切换,归一化的瓶颈链路容量等。本文主要定性的比较这些判据的特点,然后通过NS-2进行网络仿真,根据IEEE 802.11s协议中默认的路由协议,将这些多信道条件下的路由判据进行相互比较。由此,得出结论,明确各种路由判据所适用的不同的场合。

The wireless mesh network (WMN) is one of the technologies of the next generation of wireless network technology.According to the latest draft 802.11s,The routing metric is based on the radio-aware airtime link metric(ALM).This metric is much better than the hop-count metric.However,this metric may cause the attenuation of the link capacity when multi-channel or multi-radio conditions are used.In order to increase the capacity of the network,the new metrics had been proposed.Such as weighted cumulative expected transmission time,metric of interference and channel switching,and normalized bottlenecklink capacity.In this paper,we provide a qualitative comparison study that considers the characteristics of these metrics.According to IEEE802.11s,we evaluate the performance of these metrics though the simulation by NS-2.In the end,we can make a conclusion that the appropriate use case of each metric.