A QoS guaranteed Tight coupled WiMAX-3G-WLAN convergence using IMS signaling analysis

The IP Multimedia Subsystem (IMS) seems to be the technology that will prevail in Next Generation Networks (NGN s), since the interworking environment and the service flexibility that this technology offers to the currently deployed wireless broadband technologies makes it appealing to users, service developers and network operators. In this paper a heterogeneous network model based on the IMS that integrates the Worldwide Interoperability for Microwave Access (WiMAX), Universal Mobile Telecommunications System (UMTS) and Wireless Local Area Network (WLAN) technologies is proposed and provides it provides guaranteed QoS. The proposed Tight coupled WiMAX-UMTS-WLAN convergence architecture using IMS QoS provisioning algorithm is compared with interworking of WiMAX-UMTS interworking architecture using IMS QoS provisioning algorithm. The QoS performance metrics such as Email upload and download response time, Email traffic received, RIP (routing information protocol) traffic received and sent, TCP delay, TCP retransmission count, Transmission delay, Processing delay and Queuing delay were simulated using Opnet 14.5.