基于集中式带宽代理的区分服务网络接纳控制

Admission Control Based on Centralized Bandwidth Broker for Differentiated Service Networks

基于集中式带宽代理(BB)的接纳控制是区分服务网络提供端到端服务质量(QoS)保证的有效手段.文中针对目前带宽代理不能有效地支持端到端的QoS信令、难以解决重路由时的状态管理和拥塞控制的问题,设计了一种基于集中式带宽代理的接纳控制方案,给出了QoS状态信息库的定义及相应的接纳控制和状态管理算法,提出了重路由时的状态管理和拥塞控制策略,最后采用网络仿真软件NS-2对方案的有效性进行了验证.

The admission control schemes based on the centralized BB （Bandwidth Broker） are effective approaches to the providing of End-to-End QoS （ Quality of Service） guarantee for differentiated service networks. Unfortunately, the existing schemes cannot effectively support the End-to-End QoS signaling and cannot solve such problems as the state management and the congestion control when rerouting occurs. To solve these problems, an admission control scheme based on the centralized BB is designed. The architecture of the QoS state information base and the algorithms for admission control and state management are then given, and the policies for the state management and the congestion control when rerouting occurs are presented. The effectiveness of the proposed scheme is finally demonstrated by means of the network simulation software NS-2.