基于虚拟接口的802．11网络切换技术  

Handoff Technology Based on Virtual Interface in 802.11 Wireless Network

作　　者：时振宇[1] 李昭[2] 徐恪[2] 

机构地区：[1]清华大学软件学院,北京100084 [2]清华大学计算机科学与技术系,北京100084

出　　处：《计算机工程》2008年第1期111-113,共3页Computer Engineering

摘　　要：802.11网络现有的切换方案可以解决域内切换问题,域间切换涉及网络层切换操作,导致较大的网络延迟和大量的分组丢失。该文提出一种基于虚拟接口的802.11网络切换方法,通过对一个物理接口设备分时使用,使得无线终端在保证现有通信质量的情况下,平滑地完成与新无线访问点AP建立无线链路的过程。该方法具有实现简单、不用修改现有的Mobile IP协议等优点,在NS系统上的模拟表明,该方法能够满足实时交互式应用对移动切换过程中的网络质量需求。Existing schemes in IEEE 802.11 network can only resolve the problems of inner ESS domain, but cannot effectively resolve that of inter ESS domains because the handoff between two ESS domains involve network layer operations. This paper proposes a smooth handoff scheme based on virtual interface in wireless network. This scheme applies a time-sharing policy on physical wireless interface, which enables mobile station to establish new wireless link with the right new access point and to keep normal communication in present wireless link with the previous access point at the same time, so it can perfectly resolve the problems of packet latency and loss ratio for both inner ESS domain handoff and inter ESS domain handoff. Simulation results on NS2 confirmes that it can satisfy the demand of interactive real-time applications in wireless mobile network.

关 键 词：802.11网络 移动IP 平滑切换 虚拟设备 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]