A Congestion Control Framework for

In this paper, we propose a congestion control framework for ATM networks that requires simple protocols and that provides guaranteed grade of service. We suggest that the network provides two different services: express service and first-class service. Express service is appropriate for real-time applications (e.g., voice and video) whereas first-class service is appropriate for nonreal-time applications (e.g., data). To provide such services, the proposed congestion control scheme prevents congestion inside the network by controlling the congestion at two levels: VC (virtual circuit) level and cell level. The VC-level control takes place during the call setup in the form of (logical) bandwidth reservation for individual VC's. This control limits the maximum bandwidth reservation levels of linkslnodes on the route by way of call blocking, so as to prevent congestion inside the network due to VC traffic over- load. On the other hand, the cell-level control is exercised across the network interface in the form of chokingkelieving of only first-class VC traffic in case of congestion. We analyze the per- formance of the proposed scheme, and show how to engineer various parameters to satisfy cell-level performance require- ments (e.g., cell delay and loss).

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