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Network topology construction method and its support system

This paper describes a network toplogy construction method for current and nearfuture telecommunication networks. The current telecommunication network is in a transitional period, and the wide range of telecommunication services and their usage patterns, as well as the appearance of new common carriers, is creating greater and more complex traffic variations. The introduction of dynamic routing, the transition to SDH-based transmission systems, switching-system renewal and upgrading, and network reconfiguration all necessitate various changes every day, and these changes cause changes in requirements for network design. The backbone network, that is, the basic network structure that provides connections between cities is determined based on long-term traffic prediction or strategic policy. In general, there are several switching units called nodes in a city. As the capacity of new switching systems and transmission systems increases, the number of network facilities, such as nodes and circuit-switched links, can be decreased. However, it will take a long time to renew all the facilities in a telecommunication network. Network control and management capabilities are being improved to effectively handle unplanned or unforeseen traffic and to improve network survivability[2]. Dynamic routing is an effective way to meet these requirements. It connects calls that have overflown from the direct route via two-link alternate routes. In other words, each link between nodes is used as a two-link alternate route as well as the direct route. The removal of the direct route between a node-pair affects the number of selectable two-link routes between other node-pairs. Therefore, a network design method is required to make efficient use of dynamic routing even under transitional conditions, as mentioned above. This paper describes a new network topology construction method for maximizing