基于WiFi的漫游切换无缝接入技术研究

分析了传统的WiFi网络漫游切换的原理,指出身份验证过程是造成切换时间长的主要因素,进而提出了阈值切换策略和预先身份验证机制,即在工作站发起切换决策之前进行预先身份验证,将获取的AP信息缓存,在工作站正常通信的过程中,实时地监测当前AP的连接状况,根据阈值切换策略作出判断,确保切换发起的必要性和可靠性。该策略和机制可以有效缩短切换时间,较好地实现了工作站在AP之间的无缝接入,为WiFi的推广应用提供了技术保障。

Research of Technology of Seamless Access in Roaming Handoff Based on WiFi

The paper analyzed principle of traditional roaming handoff of WiFi network,pointed out that authentication process is a main factor of long handoff time,and proposed a roaming handoff scheme of threshold handoff strategy and pre-authentication mechanism,namely pre-authentication is made before workstation does handoff,and gained AP information is stored in cache;connection status of AP is monitored in real time in course of normal communication of workstation;workstation will make judgment according to the threshold handoff strategy to ensure necessity and reliability of the handoff.The strategy and mechanism can shorten handoff time effectively,realize seamless access of workstation in APs,which provides technical support for promotion and application of WiFi.