低轨星座卫星通信系统中多业务条件下的非充分保证切换策略
doi: 10.3724/SP.J.1146.2008.01241
An Insufficiently Guaranteed Handover Scheme Used in Multi-service LEO Constellation Communication System
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摘要: 该文提出了一种适用于低轨星座卫星通信系统多业务条件下的非充分保证切换策略。该策略在小于一个小区最大驻留时间的时间间隔内为到达小区的呼叫安排和预定信道，在呼叫结束环节作为补充策略对存在切换失败风险的信道进行调整。提出了策略在多业务条件下具体的实施方法，根据实时的切换呼叫性能调整策略的非充分程度。通过仿真，分析比较了不同程度非充分保证切换策略的QoS性能，验证了动态自适应调整非充分程度值的IGH策略的有效性。仿真结果表明，相对于保证切换策略，新策略以存在微小切换失败概率为代价，换取了新呼叫阻塞概率的显著降低，是一种适用于多业务低轨卫星通信系统的信道分配策略。Abstract: A non-sufficiently guaranteed handover scheme for multiple services is proposed in this paper. Under this scheme, the channels will be allocated and reserved for the arriving calls to be served when an interval is less than the maximum cell residence time. And when the calls are terminated, the allocation strategy will be adjusted for those associated channels facing the risk of handover failure. At the mean time, the degree of non-sufficient guarantee is adjusted periodically according to real-time performance of the handover calls. Through simulation, the QoSs of the proposed strategy are analyzed under different degrees of non-sufficient guarantee, and the efficiency for multiple services is thus verified. The simulation results show that, the proposed channel allocation strategy (IGH) can significantly reduce the new call blocking probability, at the expense of slight handover failure probability. Therefore, compared with the guaranteed handover scheme, IGH is more suitable for multi-service LEO constellation communication system.
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