Design and Analysis of a Bandwidth Management Framework for ATM-Based Broadband ISDN

When designing and configuring an ATM-based B-ISDN, it remains difficult to guarantee the Quality of Service (QoS) for different service classes, while still allowing enough statistical sharing of bandwidth so that the network is efficiently utilized. These two goals are often conflicting. Guaranteeing QoS requires traffic isolation, as well as allocation of enough network resource (e.g. buffer space and bandwidth) to each call. However, the statistical bandwidth sharing means the network resource should be occupied on-demand, leading to less traffic isolation and minimal resource allocation. We address this problem by proposing and evaluating a network-wide bandwidth management framework in which an appropriate compromise between the two conflicting goals is achieved. Specifically, the bandwidth management framework consists of a network model and a network-wide bandwidth allocation and sharing strategy. Implementation issues related to the framework are discussed. For real time applications, we obtain maximum queueing delay and queue length (CLR) which are important in buffer design and VP (Virtual Path) routing.