DIMENSIONING AND COMPUTATIONAL RESULTS FOR WIDE-AREA BROAD-BAND NETWORKS WITH 2-LEVEL DYNAMIC ROUTING

The Virtual Path (VP) concept is one of the versatile features of ATM/ B-ISDN. Using the VP concept, a bundle of virtual circuits can be grou ped together between any two switching nodes in the network. Further, the VP bandwidth and routing can be dynamic. Building on this idea, a dynamically reconfigurable, dynamic call routing wide area (backbone) broadband network concept is proposed. Specifically, this provides dyn amism at two levels: at the VP level and at the connection level. For an incoming connection request, at most two logical virtual path conne ctions (VPCs) are allowed between the origin and the destination; thes e logical VPCs are defined by setting virtual paths links (VPLs) which are, in turn, physically mapped to the transmission network. Based on the traffic pattern during the day, the bandwidth of such VPCs and th eir routing, as well as call routing, changes so that the maximum numb er of connection requests can be granted while maintaining acceptable quality of service (QoS) for various services. Within this framework, we present a mathematical model for network design (dimensioning) taki ng into account the variation of traffic during the day in a heterogen eous multi-service environment. We present computational results for v arious cost parameter values to show the effectiveness of such network s compared to static-VP based networks in terms of network cost.