摘要
IEEE 80 2 11无线局域网 (WLAN)规范包括MAC子层和物理层 (PHY)两个协议层 ,支持结点的移动通信 ,但它并没有提供移动主机 (MH)的无缝切换算法 当MH从当前的接入点 (AP)覆盖小区移动到另一个AP小区时 ,由于通信的暂时中断会对系统的性能造成一定的影响 目前的切换算法包括硬切换 (hard handoff)和平滑切换 (smooth handoff)等 ,这些算法要么丢包率大 ,要么切换延迟长 ,对切换的性能改善程度并不是很高 从切换延迟和丢包率两方面入手 ,提出了一种AP预先转发的WLAN切换算法 ,并对其进行了仿真实验研究 ,实验结果表明 。
The IEEE 802.11 wireless LAN protocol includes sub-MAC layer and PHY layer. It supports mobile communication of a host, but a handoff algorithm is not supplied. When a mobile host (MH) moves from one AP coverage to another, the performance will be effected by the connection disruption. Some handoff methods are supplied by literatures, such as hard-handoff and smooth-handoff. But the performance of them are not high. From the aspects of handoff latency and loss rate, a novel handoff scheme based on AP pre-forward is proposed and its simulation is carried out. The simulation result shows that the whole performance of the proposed algorithm is higher than others.
出处
《计算机研究与发展》
EI
CSCD
北大核心
2004年第8期1376-1381,共6页
Journal of Computer Research and Development
