A MODEL FOR DYNAMIC CHANNEL ALLOCATION IN AN ISDN

Integrated services digital network (ISDN) is an attempt to integrate different types of communication networks (e.g., packet switching, circuit switching) to provide services (e.g., voice, video, and data) on a demand basis. Traffic requirements from heterogeneous users in ISDN vary in their data rate, arrival rate, and service time distribution. To provide efficient service, we propose a dynamic channel allocation strategy based on traffic characteristics and channel utilization. Conventional channel allocation schemes such as complete sharing channel allocation, complete partition channel allocation, complete competition channel allocation, and moving boundary channel allocation are examined and compared with the proposed dynamic channel allocation scheme. An analytic model is developed and a solution based on the moment-generating function technique is given. Numerical examples are also presented. The result shows that the scheme improves the system performance.