一种基于模糊逻辑的多媒体组播准入控制机制

Fuzzy-logic-based call admission control scheme for multimedia multicast application

组播呼叫准入控制(CAC)是下一代网络(NGN)QoS的关键问题,在分析已有CAC机制的基础上,提出一种基于模糊逻辑的组播准入控制机制(FMAC),以服务质量、网络拥塞状态参数、可用容量和等效带宽作为模糊输入,经过模糊推理判断是否接受新的组播呼叫。仿真结果表明,FMAC在保持高的网络利用率的同时,能满足用户的QoS要求,并能保持较低的阻塞率,具有扩展性好、实现简单的特点。

Multicast Call Admission Control （CAC） is the key issue of NGN QoS. Based on the analysis of existing CAC mechanisms, a fuzzy-logic-controlled multicast call admission control mechanism was proposed, termed FMAC. FMAC considered four parameters, including quality of service, network congestion status parameters, available capacity and equivalent bandwidth, as fuzzy input for CAC. with fuzzy inference, the decision of acceptance of new muhicast call was obtained. FMAC was proved to be scalable, easy to implement, and suitable for both unicast and multicast. Simulations with multicast services show that, FMAC can reach high network exploitation while statistically meet the needs of users on QoS, and can keep low values of blocking frequency when the network is correctly dimensioned.