Analysis of the integration of WiMAX and cellular networks

Next-generation IP-based wireless network environments (NGN) will allow users to freely switch between different network technologies while preserving connectivity. Therefore, integrating heterogeneous networks is fundamental to the development of NGN models. In this article we present an analysis of the integration of WiMAX and cellular networks, specifically UMTS. We opted to use a multi-layer integration solution based on MIH, MIP and SIP. MIH facilitates media-independent handover preparation procedures, while MIP and SIP are responsible, respectively, for network and application layer mobility. The goal of the analysis is to evaluate the continuity of service during and after network transitions, and also to assure that minimum quality levels for the 3GPP QoS classes (streaming, conversational, interactive and background) are respected. Simulations were conducted to assess service continuity and evaluate QoS parameters. Data on average network delay, jitter and throughput were collected, and average handover time was measured. Results showed that network transitions occurred in a seamless manner and minimum quality levels were attained for all four QoS classes.