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中文摘要：
在原有无线环境区分服务的体系结构中,通过在一个域内扩大了每个外地代理的服务范围,将移动节点的三层切换和二层切换分开,使得每个移动节点可以被多外地代理所覆盖.同时由网络来决定移动节点切换的外地代理,减少了移动节点切换时间以及三层切换的次数.对改进前后移动节点在切换时的丢包率以及延迟等试验数据进行的比较表明,改进后系统的性能有很明显的提高.
英文摘要：
How to offer QoS guarantee in wireless mobile environment becomes one of the research hotspots. Wireless network has many differences with wired network at access characteristic and the movement of user. The introduction of QoS mechanism in mobile environment will bring a series of new problems. Differential service is one of the main solutions to offer QoS guarantee in the wireless mobile environment. This article expands the service range of Foreign Agent （FA） in the existing differential service wireless mobile system, each mobile node can be served by more than one Foreign Agent. This can decouple the layer 2 and layer 3 handoffs, and let the network to decide which FA that the mobile node should handoff to educe the handoff time and also reduce the layer 3 handoff times. At last, this paper analyzes and compares the packet loss and latency before and after improving during handoff by simulation. And it shows that system performance has been obvious improved after improved.
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