Abstract:

The admission control schemes based on the centralized BB(Bandwidth Broker)are effective approa-ches 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 admis-sion 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.Th e effectiveness of the proposed scheme is finally demonstrated by means of the network simulation software NS-2.

Key words: quality of service, differentiated service, bandwidth broker, admission control, resource reservation