摘要
对于低轨卫星通信系统(LEO)的每个小区来说,随时都有大量的新呼叫切换呼叫到达,并要求在本小区内分配有限的信道资源进行通信。这就需要一种呼叫接入算法具有优化系统性能,改善呼叫阻塞率和信道利用率等参数,因此提出了一种呼叫接入控制算法PGC(partguardchannels),即部分接入算法,此算法除吸取传统的预留信道GC(guardchannels)算法已有的优点外,还进行了一些改进,使系统的新呼叫阻塞率和切换呼叫掉话率得到了更好的平衡,在分析GC和PGC的几种子算法的基础上,进行计算机仿真,并给出了相应的仿真结果,最后在服务等级、信道占用率等重要参数方面对2种算法进行了对比分析。
Because of the frequent arrivals of new and handover call requests and limited channel resource in Low Earth Orbit (LEO) satellite system, it's necessary to adopt a call admission control(CAC) algorithm to avoid the call blockings, especially the handover call dropping probability. In this paper, a PGC scheme, which means part guard channels algorithm is introduced on the basis of traditional guard channel algorithm and keeps the better blocking probability and dropping probability on balance. Properties of the two algorithms are studied in some important aspects. Finally, computer simulation results are given and analyzed.
出处
《重庆邮电学院学报（自然科学版）》
2005年第2期184-187,共4页
Journal of Chongqing University of Posts and Telecommunications(Natural Sciences Edition)
基金
国家自然科学基金资助项目 (60 3 72 0 1 3 )~~
关键词
呼叫接入控制
阻塞率
掉话率
信道利用率
call admission control
blocking probability
dropping probability
channels utilization
