Traffic analysis of integrated satellite-terrestrial cellular networks using DS/CDMA

The continuous growth of subscribers and the large variety of requested services in cellular communication networks are driving the telecommunication industry to provide ubiquitous information access and diversified services by requiring different bandwidth and Quality of Service (QoS). Proposals being pursued in several studies and field implementations address these needs using hierarchical architectures integrating satellite and terrestrial networks in a single advanced infrastructure. In this paper a two levels hierarchical cellular communication network has been analyzed, integrating Low Earth Orbit (LEO) satellite and terrestrial layers. DS/CDMA multiple access is employed in both layers of this integrated telecommunication infrastructure. An original analytical model, based on queueing networks, has been developed for analysis of traffic. Analytical results evaluate the main system performance parameters in terms of new calls blocking probability and forced termination probability, for two classes of users.