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移动性管理是LEO(低轨卫星(low earth orbit))卫星网络通信系统中的一个重要问题.提出了LEO网络中一种改进的基于移动的位置更新和寻呼方案.在这种方法中我们引入了元小区概念,它由两个相邻波束组成.首先阐述了基于元小区模型的位置管理策略,然后推导了基于移动的动态位置管理的数学模型,并利用该模型分别计算了LEO网络中单位呼叫的位置更新和寻呼代价.通过元小区方案和普通小区的在各种网络参数环境下的性能比较证明了元小区方法的有效性和健壮性.最后为了进一步减小元小区方法中的寻呼代价,提出了强制更新策略,它强制移动终端在穿越两颗卫星覆盖区的边界时进行位置更新操作.
Mobility management is an important issue in the LEO (low earth orbit) satellite network communication system and proposes an improved mobile-based location update and paging scheme in the LEO network in which we This paper introduces the concept of meta-cell, which consists of two adjacent beams.First, the location-based management strategy based on meta-cell model is introduced, then the mathematical model of mobile-based dynamic location management is deduced, and the LEO model The location update and the paging cost of unit call.Comparing the performance of meta-cell scheme and common cell in various network parameters environment, the effectiveness and robustness of meta-cell method are proved.Finally, in order to further reduce the cost of meta-cell method Paging costs, a forced update strategy was proposed that forces mobile terminals to perform location updates as they traverse the boundaries of the two satellite coverage areas.