摘要
在低轨卫星移动通信系统中 ,由于卫星和移动用户间的相对运动使得呼叫切换频繁发生 .为了降低星间切换请求到达率 ,减小系统切换开销 ,本文在距离优先接入方案基础上进一步提出了两种接入策略 :覆盖时间优先方案和仰角加权的覆盖时间优先方案 .构造了非均匀分布全球话务密度模型 .并参照某实际系统参数 ,对不同接入方案准则下的全球话务服务进行了系统仿真 。
In low earth-orbiting (LEO) satellite mobile communication systems,frequent han dover requests exist because of the relative motions between the satellites and the mobile users.In order to decrease the handover requests for systems saving,t wo access schemes besides the distance-prioritized scheme are proposed in this paper.One judges the priorities by estimating the overlaid time,the other scheme additionally considering the elevation angle performance.A non-uniform distrib uted global traffic model is also constructed.By emulating the global traffic se rvice through a LEO satellite mobile communication system under different access schemes,the performance of the networks are analyzed.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2000年第7期55-58,共4页
Acta Electronica Sinica
基金
8 63基金
中兴基金资助项目
关键词
卫星移动通信
话务模型
卫星通信
satellite mobile communication
handover
access scheme
traffic model
