A Distributed Model to Compare QoS Performance For VoIP Over WLAN And WiMAX Network With Respect to Delay Parameter

Abstract

Worldwide Interoperability for Microwave Access (WiMAX) and Wireless LAN (WLAN) provides a solution to the increasing demands for wireless broadband Network which provide high-rate voice services at low cost and flexibility over IP-based networks. The Institute of Electrical and Electronics Engineers (IEEE 802.16) Standard introduces several advantages; one of them is Quality of Service (QoS) which is an important metric for transmission capacity requesting applications in WiMAX and WLAN Network. Despite the fact that it permits the Subscriber Station (SS) to change the saved transmission capacity through transfer speed demands in every edge, it cannot keep away from the danger of neglecting to fulfil the QoS prerequisites support at the Media Access Control (MAC) level. However, the existing VoIP over WLANs and WiMAX architecture does not provide sufficient QoS in both networks. In this paper a new Distributed Client-Server model to improve QoS performance for VoIP over WLAN and WiMAX network with respect to Delay parameter was developed. The model was simulated in the OPNET modeller (16.0) with Multiple Access Points (APs), Base Stations (BSs) as well as Subscribers Stations (SSs), and some selected server BSs that were selected using Nearest Neighbourhood Algorithm and Orthogonal Frequency Division Multiplexing (OFDM) techniques. The results obtained from this proposed model showed significant performance improvement in network Delay. The result furthermore shows that there is less delay in WiMAX network as compared to WLAN network.