CDMA系统中基于剩余容量的呼叫接纳控制

Residual Capacity-Based Call Admission Control for CDMA Systems

呼叫接纳控制是CDMA 蜂窝系统无线资源管理的重要功能实体,文章首先根据不同接纳准则简单介绍了当前几种呼叫接纳控制算法并进行性能分析,然后提出CDMA 系统中基于剩余容量的呼叫接纳控制算法,算法中通过改变可变系数β动态调整系统为切换请求用户预留容量,降低了切换请求用户掉线概率,且充分利用系统资源,大大提高了系统总体性能. 最后结合当前研究热点及CDMA 蜂窝系统特征分析了呼叫接纳控制算法的发展趋势,以期对其最近和将来的研究给出必要的背景.

Call admission control(CAC)is becoming an important function entity of CDMA cellular systems in radio resource management. In accordance with different admission rules, several CAC algorithms are introduced and an analysis of their performance is made. Then a residual capacity- based CAC scheme is proposed for CDMA systems. In this scheme, the residual capacity for handoff users by means of a changeable parameter( β ) can be regulated. As a result, handoff drop probability is reduced, system resource is utilized efficiently, and the systems’ total performance is increased. Finally, in light of current academic hotspots and the properties of CDMA cellular systems, development trends of CAC algorithm are analyzed. This paper is intended to introduce the necessary background of recent and ongoing research into this issue.