基于预测与优先级缓存的MIPv6切换算法

为了提升移动IPv6的切换性能,保证实时性要求高的音频、视频等业务的服务质量,针对去除DAD过程的RDMIPv6方案未考虑在传输速率相对较慢的无线信道中,移动节点向NAR本地注册所产生的时延以及切换过程中引入的丢包问题,提出一种优化方案PCRD-MIPv6。PCRD-MIPv6方案结合基于L2触发的切换预测和数据包优先级缓存机制,在L2切换完成之前向移动节点MN维护的接入路由器缓存列表T_AR中的所有AR发送MOA实现本地注册,与此同时,将切换过程中的数据包按优先级缓存在PAR中,在切换完成后发往移动节点,从而减少切换过程中的丢包率。NS-2仿真结果表明,PCRD-MIPv6方案有效地减少了切换时延,降低了切换过程中的丢包率。

MIPv6 Handover Algorithm Based on Forecast and Priority Cache Mechanism

In order to improve the performance of handover in MIPv6,ensure the service quality of high real- time requirements service like audio,video and so on,aiming at the problem that the mobile node registering to the NAR may get time delay and packet loss in the handover progress has not been taken into consideration in the wireless channel of which the transmission rate is relatively slowin the DAD- less scheme RD- M IPv6,an optimization scheme PCRD- MIPv6 has been proposed. The PCRD- MIPv6 combined handover prediction triggered by L2 and packets priority caching mechanism,the mobile node register to all the AR in access router cache list T_AR by sending M OA address to them before the L2 handover completed,meanwhile,the packets are cached in the PAR according to the priority during the handover progress and send to the mobile node after the handover progress is finished in order to reduce the packet loss rate. The NS- 2 simulation results showthat the PCRD- MIPv6 scheme can effectively shorten the handover delay and reduce the rate of packets loss.