摘要
通过分析GEO卫星与地面移动通信网络多覆盖下的信号分布特点和终端运动特点,提出了终端在通话过程中切换次数的估计方法。利用切换过程中产生的信令数目、切换延迟、信号质量和丢包情况建立了切换代价模型,以量化切换对通话质量的影响。在此基础上提出了基于代价估计的切换判决算法。仿真结果表明,该算法相比于传统算法,能显著降低高速终端的切换次数和切换延迟,提高了切换效率。
By analyzing the receiving signal strength and mobility of terminals in GEO satellite and terrestrial networks,a method to estimate times of handover is derived.Then the number of handover signals,handover delay,signal quality and packet loss are used to form a model of handover cost.Based on the model,a handover strategy is proposed to choose different network to handover by different mobile terminals.Simulation results demonstrate that the strategy based on the model reduces handover times and delay in high speed terminal compared with the traditional methods.
出处
《计算机工程与设计》
CSCD
北大核心
2013年第10期3361-3365,共5页
Computer Engineering and Design
基金
国家共性软件预研基金项目(615010305)
