ATM用户接入系统中呼叫接纳控制的实现

The Implementation of CAC Scheme in ATM Access System

以ATM用户接入系统为背景,介绍呼叫接纳控制(CAC)的实现方法和工作过程.呼叫接纳控制是ATM网络流量控制的基础.呼叫接纳控制模块收到呼叫接纳请求后,根据新连接的流量和业务质量要求以及现有网络资源情况,决定是否接受这一新连接.如果接受,就通知网络为新连接分配网络资源,同时把新连接的流量参数送交用法参数控制(UPC)模块进行流量监控和计费.呼叫接纳控制尚无一种完美的算法,等效带宽法因叠加性和可操作性较好而应用较广;快速缓冲区/带宽分配法对突发性强的信元有良好的表现.

The implementation of Call Admission Control scheme in ATM access system is introduced in this paper. CAC is the base of ATM traffic control. After receiving the call admission request, CAC module decides whether to admit this new connection according to the flow, QoS requirement of the new connection and the current network resource scenario. If to admit this call, the network is notified to allocate network resource to the new connection and submit the new connection's flow parameters to Usage Parameter Control module for flow monitoring and billing. The CAC algorithms are also introduced in this paper, but no one is perfect for CAC.