子网移动性管理及其性能优化研究

Subnet Mobility Management and Performance Optimization

子网移动性管理的最终目标是移动网络中的所有节点都可以通过一个永久的IP地址被访问,并且当移动网络的路由器改变接入点时,内部节点仍然可以保持连续的通信。但当前的移动性管理方案由于其基本协议的切换时延较大,丢包率较高而不能适应实时业务和移动通信的要求,需要对移动性管理策略进行改善。文中介绍一种基于SIP和SCTP协议的混合方法Hybrid-NEMO,解决基于MIPv6的NEMO所存在的问题。通过建立相应模型并进行仿真对比分析,该方案能够保证网络移动切换过程中零丢包率和可控制的时延抖动,完全可以实现网络无缝移动的有关性能指标,从而较好地解决了现有移动网络模型实现无缝移动过程中的不足。

The ultimate goal of subnet mobility management is that all the nodes in mobile network can be accessed through a permanent IP addresses, and when mobile network touters change their access points, internal nodes could still maintain continuous communications. However, existing schemes of mobility management could not meet the requirements of real time services and mobile telecommunications, because of their latency time of handover procedure and high loss of data packet. Thus the strategy of mobility management should be improved. This paper presents a hybrid method called Hybrid-NEMO, which is based on SIP and SCTP protocol, in order to solve the existent problem in MIPv6-based of NEMO. The corresponding simulation model and simulation analysis indicates that this scheme could ensure no packet loss and controllable delay jitter in the switching process of mobile network, and is fully capable of achieving the relevant performance indexes of seamless mobile network. Thus the deficiency in realizing seamless mobility of the existing mobile network model is fairly avoided.