Modeling telecommunication infrastructures integrating wideband wireless and wired networks

Future telecommunication systems will integrate wireline and wireless networks in a single, advanced infrastructure. It is expected that such systems, in the wireless part, will exploit microcellular architectures in order to guarantee wideband multimedia services and to sustain the continuous growth of subscribers. In such a context, asynchronous transfer mode and Internet protocol are the basic technologies being considered by several studies and field implementations. In both cases, particular care has been devoted to cope with a large number of handoffs. This article considers some aspects of this integrated telecommunication infrastructure, proposing an improvement, for the wired part, of the virtual connection tree and shadow cluster concepts, whereas for the wireless part, a new model for the analysis of a dynamic channel allocation scheme is presented. The obtained analytical results, confirmed by simulation in a wide range of load conditions and user mobility, allow one to evaluate the main system performance parameters in terms of blocking probability of new calls, handoff-blocking probability, and forced termination probability.