一个具有链路层支持的快速Mobile IP切换算法  

A Fast Mobile IP Hand-off Algorithm with Link Layer Support

作　　者：熊焰[1] 郭亮[1] 顾乃杰[1] 苗付友[1] 华蓓[1] 

机构地区：[1]中国科学技术大学计算机系,安徽合肥230026

出　　处：《小型微型计算机系统》2003年第6期950-953,共4页Journal of Chinese Computer Systems

基　　金：国家 8 63重大项目 (项目编号为 863 -3 17-0 3 -0 3 -99)

摘　　要：由于目前流行的 Mobile IP切换都假定了 IP层无法得到链路层信息 ,所以 ,只能通过周期性地广播代理广告来实现位置移动检测 ,因而浪费了无线带宽 ,延长了切换时间 ,降低了 TCP性能 .一方面随着无线网络带宽的不断增高(当前的带宽已达到 2 Mbps) ,无线链路上的信息传输延迟将越来越小 ;另一方面 ,在移动计算环境中 ,如果 IP层能够及时获得一些无线链路层的信息 ,那么上述的缺点就能被有效地克服 .本文提出了一种具有链路层支持的快速 Mobile IP切换算法 ,分析了快速 Mobile IP切换算法和三个已知切换算法的切换时间 ,并在我们已完成的宽带无线 IP网络中对上述切换算法进行了对比实验 .理论分析和对比实验均表明快速 Mobile IP切换算法的延迟降低了一个数量级且极大地改善了Current Mobile IP hand off algorithms assume that the IP layer can't get link layer information. Movement detection of a Mobile Node can only be done by broadcasting agent advertisements periodically. It wastes the bandwidth of wireless links, delays mobile IP hand off, and TCP performance is lower. With increasingly growth of wireless network's bandwidth (at present, the wireless link bandwidth can reach 2M bps), delay of IP packet transmission will be lower and lower. On the other hand, in the environment of mobile computing, if the IP layer can obtain some information about wireless link layer in time, the above shortcomings will be overcome efficiently. This paper proposes a fast mobile IP hand off algorithm with link layer support and analyzes the algorithm performance. On a broadband wireless IP network, we give experimental results of the three known hand off algorithms and our algorithm. Both performance analysis and experimental results have shown that the fast Mobile IP hand off algorithm reduces the hand off delay by about 10 times and TCP performance is improved greatly, comparing to the three known Mobile IP hand off algorithms.

关 键 词：MOBILE IP 切换 宽带无线IP网络 

分 类 号：TP31[自动化与计算机技术—计算机软件与理论]