MPSSF:一种低失序的缓存转发移动切换方案

全IP无线移动网络的微移动协议在无线接入网采用快速切换技术降低移动切换时延，同时采用了数据包缓存转发技术来解决切换过程中的丢包。多流转发方案存在较多的失序，使上层的TCP协议不适当地启动拥塞控制机制而降低吞吐量。单流转发方案虽然没有失序，但是会占用较多的网络资源并增加数据包的时延。提出一种多径单流转发方案MPSSF，较好地解决了移动切换过程中数据包的丢失与失序问题，同时网络资源消耗以及数据包时延也比单流转发方案显著减小。网络模拟实验表明，MPSSF在移动切换时避免了数据包失序，保持了TCP的拥塞窗口，对TCP性能的改善效果优于多流转发方案及单流转发方案。

MPSSF:A Buffering & Forwarding Handover Scheme Reducing Out-of-Sequence Packets

In order to minimize packets loss during handover, fast handover technique as well as packet buffering & forwarding techniques are adopted by micro mobility protocols in All IP wireless mobile network There are mainly two kinds of buffering & forwarding schemes, that is, multiple stream and single stream The multiple stream scheme is simple but can lead to the creation of out of sequence packets As an alternation without out of sequence packets, the single stream scheme consumes extra network resources A new scheme called MPSSF (multiple path single stream forwarding) is proposed in this paper It features less out of sequence over the single stream scheme and remarkable reduction of extra consuming of network resources Simulation results show that fast retransmission triggered by out of sequence packets is avoided in MPSSF, and thus the TCP performance is better than that of the multiple stream scheme or single stream scheme