一种基于TCRA的低轨星座通信系统的强占预留信道策略  

A preempting reserved channel mechanism based on TCRA in LEO constellation communication system

作　　者：刘彦辰[1] 丁丁[1] 袁琼清[1] 马东堂[1] 

机构地区：[1]国防科技大学电子科学与工程学院,湖南长沙410073

出　　处：《电子技术应用》2008年第12期124-127,共4页Application of Electronic Technique

基　　金：国防科技重点实验室基金(51435050105KG0102)

摘　　要：在基于时间信道预留算法的基础上,提出了一种改进的低轨星座通信系统信道分配策略——强占预留信道策略。讨论了策略的基本原理,并通过仿真,比较分析了该策略与 TCRA 和固定信道预留策略对系统新呼叫阻塞概率、切换失败概率和服务等级的影响。仿真结果表明,与 TCRA 策略相比,该策略有效降低了新呼叫阻塞,同时为网络提供更好的 QoS 保证。Based on time-based channel reservation algorithm （TCRA）, this paper proposes an improved channel assignment strategy in LEO constellation communication system preempting reserved channel mechanism. The basic principles of this strate- gy are discussed. And through simulation, the impacts of the proposed strategy to the new call blocking probability, the handoff failure probability and the grade of service are analyzed and compared with those of TCRA and the guard channel method.The simulation results show that, compared to TCRA, the proposed strategy can effectively decrease the new call blocking probability,and at the same time provide better QoS guarantees for the network.

关 键 词：低轨星座通信系统 信道分配 切换管理 基于时间信道预留算法 

分 类 号：TN927.23[电子电信—通信与信息系统] TN929.5[电子电信—信息与通信工程]