一种802.11s无线Mesh网络快速切换方案

802.11s Based Fast Transition Scheme for Wireless Mesh Network

在无线Mesh网络中,为保证无Mesh功能移动终端在无线接入点之间快速移动时,仍能保持高速数据传输,提出了一种基于802.11s的无线Mesh网络二层快速切换机制.该机制采用跨层设计的思想,整个切换过程均在二层实现,兼顾了LLC子层和MAC子层的信息,融合并改进了802.11s的相关机制,极大地提高了切换效率.仿真结果表明,与802.11s草案定义的切换方案相比,采用该快速切换机制时,切换延时可缩短2-4倍,丢包数可降低2-8倍.

In order to guarantee that a mobile station without mesh function can still keep a high transmission rate while it moves fast between wireless access points in the wireless mesh network（WMN）,a layer two（L2） fast transition scheme based on 802.11s WMN was proposed.This scheme employs the idea of cross-layer design,and the whole transition process is implemented at L2.It considers the information both from LLC（logic link control） sub-layer and from MAC（medium access control） sub-layer,combines and improves the related 802.11s schemes to greatly raise the efficiency of the transition.The simulation results show that compared with the transition scheme defined in the 802.11s draft,the fast transition scheme can decrease the transition delay by 2 to 4 times and the number of packet drop by 2 to 8 times.