关键词: 卫星通信，网络移动，传输控制协议，切换

Abstract: 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.

Key words: Satellite communication, Network mobility, TCP, Handoff