多业务CDMA系统中呼叫接纳控制算法的改进

An Improved Adaptive call Admission Control Arithmetic in Multi-traffic CDMA System

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,有效的CAC算法能满足各类业务的不同QOS要求的同时,还能提高资源利用率.在CDMA系统多业务情况下,已有文献提出一种基于门限比较的接纳控制算法,但是该策略考虑的是在理想条件下.本文对其进行改进,使门限不是一个常数;小区移动台分布不均匀;门限的大小随着系统业务负荷变化自适应的调节.MATLAB仿真结果显示,改进后的方案比以前有较好的性能.

As one of the most important function entity of RRM （Radio Resource Management） in CDMA system, an efficient CAC （Call Admission Control）arithmetic is essential to provide QOS guarantee of different services to enhance the utilization of radio resource. The existing papers have proposed the CAC arithmetic based on threshold, which was only considered for ideal environment. This paper extends the arithmetic to multi-traffic environment to make the arithmetic more practical. The threshold is not a constant and it can be adaptively adjusted according to the traffic load. This paper researches an improved that the improved arithmetic is better. adaptive CAC arithmetic. Simulation results by MATLAB verify that the improved arithmetic is better.