CONNECTION ADMISSION CONTROL IN A HYBRID NETWORK (SATELLITE-WIMAX-UMTS)

Connection Admission Control is a mechanism put in place to guarantee that a call will be accepted and the associated QOS requirements can be supported for the entire duration of the call without affecting the QOS of the existing calls on the network. This paper is focused on the design, simulation and implementation of a Hybrid CAC algorithm for a Hybrid Network comprising of Satellite, UMTS, WiMAX and Wi-Fi as the underlying network entities. The performance metrics of a CAC algorithm includes: Throughput, delay, fairness, power consumption and multimedia support. An in-depth review of previous approaches to CAC policy is explored from various literatures. The past, present and future modifications on various CAC policies is also highlighted. The basic components of a CAC algorithm, as well as the features of various CAC strategies are used in making a comparative analysis of the various types of CAC algorithms; introducing the Hybrid CAC with an edge over the previous policies adopted. The Hybrid Network Architecture is realised from interconnection of the network entities, the structure of these underlying networks is also explored along with their various QOS service classes. A Framework of the Hybrid CAC is established in the simulation scenario with OPNET software. The Project Model, Node Model and Process Model is realised, compiled and simulated to yield results which were analysed, using network performance indicators. Conclusions on this thesis were based on these performance indicators. An idea of future work on the Hybrid CAC is highlighted.