LEO卫星网络中基于门限的切换优先资源管理机制

A Threshold-based Handover Prioritization resource management Scheme in LEO Satellite Networks

本文针对低轨道(Low Earth Orbit,LEO)卫星网络提出了一种基于门限的切换优先(Threshold-based Handover Prioritization,TBHP)资源管理算法,通过推迟信道锁定的时间来提高资源预留的精度,在保持高优先级用户强制中断概率极小的条件下改善网络用户的新呼叫阻塞概率,从而获得较高的系统无线资源利用率。建立了该算法的理论分析模型,确定了系统参数、业务条件与协议的工作参数之间的量化关系。仿真结果表明,TBHP算法在保留了经典GH算法保证高优先级用户切换过程的优点的同时,增大了系统允许接入新呼叫的概率,从而进一步提高了系统的资源利用率。

In this paper, the author proposed a threshold-based handover prioritization （TBHP） management scheme for LEO satellite networks. In order to utilize the resource more effectively, the proposed method defers the channel locking time in the Guaranteed Handover （GH） algorithm, and in this way decreases the new call blocking probability while keeping very small forced termination probability of prioritized users. The new method is evaluated through an analytical model, from which the quantitative relation between the critical operational parameters and system performance metrics is derived. Simulation results show that our scheme offers a better chance to accept a new call while guaranteeing the handover processes for prioritized calls to a certain extent. Therefore the system resource utilization is improved.