A new Distributed Model Comparison to Enhance VoIP QoS Performance over WLAN and WiMAX Network
The Worldwide Interoperability for Microwave Access (WiMAX) and Wireless LAN (WLAN) Network provides a solution to ever-increasing demands for wireless broadband applications that facilitated low-cost , high-quality voice services and good flexibility over IP-based networks. The Institute of Electrical and Electronics Engineers (IEEE 802.16) Standard introduces several of these network advantages one of which is Quality of Service (QoS). But the existing VoIP over WLANs and WiMAX architecture in both networks does not provide sufficient QoS. In this paper a distributed client-server model was developed to improve the efficiency of QoS for VoIP in terms of delay in the WiMAX and WLAN network in order to improve the services offered to end users. The addition of Server BSs and the introduction of OFDM technique improved QoS performance with respect to the parameter delay. The design was evaluated using the simulation tool OPNET modeler 16.0 and compared with the existing centralized model. The results obtained from the new distributed Client-Server model shows less network delay for WiMAX network and WLAN network delay compared to the existing Centralized Model. The result furthermore shows that there is less delay in WiMAX network as compared to WLAN network. Also, this Model will help the Internet Service Providers (ISPs) in term of data delivery by operating from many server BSs, and also this should reduce the cost of infrastructure development.