多媒体低轨卫星系统中改进的有优先权的动态信道预留策略研究
首发时间:2016-12-26
摘要:本文为多媒体低轨卫星系统提出了一种改进的有优先权的动态信道预留(UDCRP)策略。为了获取最佳的系统平均服务质量,UDCRP策略重新研究了预留信道阈值分布情况和动态阈值的求解方法。接着,对UDCRP策略进行了理论分析,包括LEO卫星系统移动性模型,基于马尔科夫链的信道分配模型和使用遗传与粒子群混合算法(GA-PSO)的阈值求解方法。仿真结果表明所提出的策略能够为多类型业务提供更加准确和灵活的动态信道预留,在有效降低切换呼叫阻塞率的同时,提升了系统整体的服务质量。
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Updated Dynamic Channel Reservation Scheme based on Priorities for Multimedia LEO Satellite Systems
Abstract:An updated dynamic channel reservation scheme based on priorities(UDCRP), which works for multimedia LEO satellite system, is proposed in this paper. To obtain the overall system's optimal quality of service, the proposed scheme redefines the thresholds distribution for reserved channels and the method for solving the dynamic thresholds. Then, the analytical approach is described including the LEO satellite mobility model, the channel allocation model based on Markov chain and the solution of the thresholds with the method of genetic-particle swarm optimization hybrid algorithm(GA-PSO). It has been proved by simulation results that the proposed scheme has the capability of offering more accuracy and flexibility for the dynamic channel reservation of different classes of service as well as effectively reduce handover failures. Moreover, the quality of service for the overall system has been improved
Keywords: satellite communication low earth orbit (LEO) handover dynamic channel reservation
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No.4714611117451614****
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