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与地面蜂窝系统相比,GEO卫星移动通信系统具有波束覆盖大、信号传输时延长、星上资源受限和终端移动速度分布跨度大的特点。为此,从GEO卫星移动通信系统的特点出发,提出一种根据导频信号接收强度和移动终端速度估计,对平均窗口长度和滞后余量取值进行自适应调整,且易于实现的动态切换算法。系统建模仿真结果表明,与传统算法相比,该切换算法降低了链路衰落率和切换时延,避免了不必要的切换,对高速终端具有较好的适应性。
Compared with the terrestrial cellular system, the GEO satellite mobile communication system has the characteristics of large beam coverage, prolonged signal transmission, limited resources on the satellite, and large terminal spanning speed distribution. Therefore, based on the characteristics of the GEO satellite mobile communication system, a dynamic handover algorithm based on the pilot signal reception strength and mobile terminal speed estimation is proposed, which adjusts the average window length and the hysteresis margin adaptively, and is easy to implement . The results of system modeling and simulation show that the proposed algorithm can reduce the link fading rate and handover delay compared with traditional algorithms, avoid unnecessary handovers and has good adaptability to high-speed terminals.