低轨卫星互联网多属性切换控制方法

针对低轨(low earth orbit, LEO)卫星通信系统中星间单属性切换容易造成当前属性最优而其他属性较差的问题，提出一种LEO卫星星间多属性切换路径筛选算法。该算法根据终端的运动情况以及卫星星历信息预测未来一段时间内可供终端切换的所有服务卫星。同时考虑服务时长、仰角以及空闲信道3个属性对星间切换的影响，找到一条在3种属性上都较优的切换路径。仿真结果表明，所提算法不仅可以降低切换失败率，还可以降低星上的平均负载以及新呼叫的阻塞率。

Multi-attribute Handoff Control Methodfor LEO SatelliteInternet

In order to solve the problem that single attribute handoff between satellites in low earth orbit (LEO) satellite communication systems is likely to cause the current attribute to be optimal and other attributes to be poor, this paper proposed a multi-attribute handoff path selection algorithm between LEO satellites. According to the movement of the terminal and the satellite ephemeris information, the algorithm predicted all the service satellites available to the terminal handoff in a future period of time. At the same time, considering the influence of service duration, elevation angle and idle channel on inter-satellite handoff, a handover path that was optimal in all these three attributes was found. The simulation results show that the proposed algorithm can not only reduce the handoff failure rate, but also reduce the average load on the satellite and the blocking rate of new calls.