基于双动态门限保护信道的接入策略  

Scheme of Dual Dynamic Threshold Guard Channel(DDT-GC) for Access Control

作　　者：付立[1] 荆涛[1] 刘莉[1] 冯玉珉[1] 

机构地区：[1]北京交通大学电子信息工程学院,北京100044

出　　处：《铁道学报》2007年第4期48-51,共4页Journal of the China Railway Society

基　　金：国家自然科学基金资助项目(60472034)

摘　　要：随着移动业务用户数量和业务种类的快速增加,如何更加合理地分配多业务移动通信系统中的有限资源成为非常重要的问题。现有文献对于该问题进行的研究和讨论,是采用合理的呼叫接纳控制策略能有效地改善系统资源利用的合理性和系统性能。针对多业务移动通信系统的特点和现有接入策略中存在的不足,本文提出双动态门限保护信道接入(DDT-GC)策略。该方案通过动态调整门限值,合理地对资源进行分配,采用二维Markov过程对系统进行建模和性能分析,并与静态双门限保护信道策略及无预留方案进行了比较。数值仿真结果表明,DDT-GC策略既保证了系统的服务质量,又有效地降低了系统的切换中断率和呼叫阻塞率,同时提高了系统资源的利用率。Along with fast increasing of the number of mobile users and the kind of services, how to allocate the limited system resources more efficiently has become very important. Some research results are available in the current documents, where the system resource utilization is able to be improved efficiently by adoption of the rational call access control scheme. The Dual Dynamic Threshold Guard Channel （DDT-GC） scheme is proposed in this paper in view of the characters of the multi-service mobile communication system and the shortcomings of the existing access control scheme. By dynamically adjusting the values of both thresholds, the system resource utilization is improved and a better overall system performance is achieved. The two-dimensional Markov process traffic models for cellular mobile systems are formulated and analyzed. It is verified by numerical simulations that the DDT-GC scheme is able to guarantee the quality of services, decrease the handoff dropping probability and forced termination probability, and improve the system resource utilization.

关 键 词：呼叫接纳控制 保护信道 MARKOV过程 

分 类 号：TN915.01[电子电信—通信与信息系统]