This paper proposes an algorithm for cooperative control over both logical (switching) and physical (transmission) networks for multiservice environments. The control of the logical networks, which conduct traffic routing in response to demands for grades of service, is cooperatively performed with the control of the physical network, which allocates capacity based on the network topology and its resources. A case study is carried out to evaluate the usefulness of the proposed cooperative control method. The case study results show the proposed method provides grade of service satisfaction for a wider range of network condition and improvements in throughput compared with the separate logical or physical network control method. In addition, the application of the proposed control method to ATM networks is discussed.

This paper describes a planning method for ATM networks. The method is based on evaluation of two design items, VC routing and VP routing, as well as on consideration of VPI constraints. In the evaluation, VC routing is compared with VP routing in separate case studies undertaken from the point of view of various parameters such as traffic volume, cost function and network scale. The results suggest the vertical relationship between VC and VP levels in optimally designed ATM networks. VC and VP network levels are then studied separately, and design methods are proposed for individual levels. In addition a perturbation method is proposed for the VC and VP routing use, whose optimum is varied as a function of the parameters described above. Evaluation results show the proposed perturbation method provides cost-effective networks.