WLAN中基于接入点的快速切换方案  

Fast Handoff Scheme Based on Access Point in WLAN

作　　者：陈圣达[1] 吴振强[1] 

机构地区：[1]陕西师范大学计算机科学学院,西安710062

出　　处：《计算机工程》2011年第18期100-102,共3页Computer Engineering

基　　金：国家"863"计划基金资助项目(2007AA01Z438200);国家级大学生创新性实验计划基金资助项目(091071811)

摘　　要：移动终端在接入点(AP)之间切换产生的时延和抖动严重影响实时业务的质量。为解决该问题,提出一种基于接入点的快速切换方案,采用两级触发机制减轻移动终端和AP的工作量,利用改进的先应式邻居缓存机制避免频繁切换导致的AP缓存溢出问题,通过邻居AP信息表和切换决策算法找到最佳目标AP。实验结果表明,该方案具有较高的安全性及较低的网络吞吐量和功耗,可以减少77.1%的切换时延。Time delay and jitter resulting from mobile termination handoff between the Access Point（AP） are serious impact on the quality of real-time business.In order to solve this problem,this paper proposes a fast handoff scheme based on access point.It uses a two-stage trigger mechanism to reduce the workload of mobile termination and AP,utilizes improved priority neighbor cache mechanism to avoid cache outflow coming from frequent switch,uses neighbor AP information table and switching decision strategy make out the best target AP.Analysis and experimental results show that this scheme has the high safety and low network throughput and power consumption,and it can effectively reduce the 77% handoff delay.

关 键 词：快速切换 IEEE802.11协议 无线局域网 接入点 切换时延 

分 类 号：TP39[自动化与计算机技术—计算机应用技术]