基于卫星通信的网络移动建模与性能仿真

网络移动是指一个移动IP网络能够在保证通信连接不中断的条件下改变到一个IP骨干网的连接点,从而解决整个网络在移动过程中的不间断数据传输问题.采用卫星通信网实现移动网络的数据传输可以提供足够的带宽和更大的覆盖范围,是一种比较经济、可行的解决方案.首先建立了基于卫星通信的网络移动通信系统模型并在NS2软件中实现了该模型,然后基于该模型对TCP的性能以及切换对其性能的影响进行了仿真,最后通过分析卫星通信的特点提出了一种改进的切换策略.仿真结果表明,该策略可以显著减少切换引起的TCP中断时间.

Modeling and Performance Simulating for Network Mobility Based on Satellite Communication

Network mobility (MEMO) means that it can solve the problem of mobile users in big mobile platforms changing access to IP core network while not disrupt the communication. Satellite has the characteristics of broadcasting,large scale and seamless coverage of the earth. Thus, it is an effective and feasible way to tackle the problem of MEMO with satellite communication. At first, a model of network mobility communication system based on mobile satellite communication was built up and implemented in the NS2. Then, under the model, the performance of TCP was simulated. Finally, according to the traits of satellite communication, a handoff strategy in IP layer was proposed for MEMO based on satellite communication. The strategy can reduce delay of interrupt and improve the performance of TCP.