iffServ网络架构中基于带宽代理的QoS接纳控制机制的研究

Nowadays, as the Internet technology and real time services requirements rapidly increased, the related technologies that could supply an end to end QoS guarantee have become the research hotspot in current industry in order to meet with the QoS requirement of services on bandwidth, delay and delay jitter. In this paper, we focus on the problem and present a resolution to implement a distributed QoS admission control mechanism based on the construction of hierarchical Bandwidth Broker(BB) in the Differentiated Service(DiffServ) architecture. The paper is commenced with the introduction of DiffServ network model and the sort of admission control mechanism. Afterwards, the function structure of centralized BB and distributed hierarchical BB is put forward. Eventually, after analyzing the message process procedure, it comes up with four kinds of admission control algorithm based on the hierarchical BB analyzed and are compared and validated in the acceptance rate, network utilization and average waiting time using the NS-2 simulation.