GMR-1卫星通信系统中的降低切换时延算法

相对于地面移动通信系统,高轨道静止卫星系统(high orbit geostationary satellite system,GEO)具有波束覆盖大、信号传输时延长、星上资源受限等特点.当前地面移动通信系统切换算法不能满足GEO卫星移动通信系统实时性要求.提出了一种降低卫星通信系统切换时延算法,该算法利用卫星通信移动终端位置信息和历史测量信息获得切换位置区域,根据规划导航路径是否经过切换位置区域进行切换预判,结合移动终端移动矢量和移动速度对可能跨越切换位置区域进行更精确切换判决.与现有地面移动通信系统切换算法相比,该算法不仅利用了移动终端的功率测量和接收信号质量等传统参量,而且综合考虑了移动终端位置以及移动矢量信息.仿真结果表明,该算法不但可以大幅降低卫星波束切换的时延,而且降低切换的乒乓效应.

Low handover delay algorithm on GMR 1 satellite communication system

Compared with the ground mobile communication system, GEO satellite mobile communication system has the features of a large beam coverage, extended signal transmission, and limited satellite resources. Therefore, the existing satellite handover algorithm cannot meet the real-time requirements of GEO satellite mobile communication system. For this reason, we propose an algorithm to reduce the handover delay of satellite communication system. The position information of the satellite communication terminal and the historical measurement information are used to get the handover location area. Then according to whether planning navigation path through the handover position area to make handover prejudgment. Finally we make a more accurate handover decision that is combined with the terminal mobile vector and the moving speed of the possible cross handover location area. Compared with the existing ground mobile communication system handover algorithm, this algorithm not only makes use of the traditional parameters such as the power measurement of the terminal and the quality of the received signal, but also gives an overall consideration to the location of the terminal and the mobile vector information. Simulation results show that the proposed handover algorithm not only can reduce the delay of the satellite spot beam handover, but also can lower the ping pong effect.