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中文摘要：
对于移动卫星网络，合理的星地链路切换方案需要在保证最小切换时延的同时，能够最优地使用网络资源。该文通过引入业务的中断概率和费用模型，给出了切换过程中重路由的最优触发条件，提出一种基于最小费用的切换（SMCH）算法。该算法可在保证切换业务通信的连续性和时延等指标不被破坏的基础上，通过适当的触发重路由来降低切换费用。仿真表明该算法在保证切换业务的QoS，降低切换费用以及适应性、灵活性等方面都优于同类切换算法。
英文摘要：
In mobile satellite networks, for the aim of shortening handover delay while using network resource efficiently, a proper handover scheme should be given. In this paper, by introducing the interrupting probability and the cost model of service, triggering schemes for path optimization in handover is given. Here, a novel mobile Satellite networks Minimum Cost Handover （SMCH） algorithm is proposed. This algorithm can assure the Quality of Service （QoS） parameters （such as delay） during the handover, as well as can minimize the handover cost. So it can use the network resource efficiently after the handover. Correlative simulation indicates that this novel algorithm is superior to other current algorithm in respect of guaranteeing the QoS and decreasing handover cost. Besides, it also has more adaptability and more practicability.
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