Research Article
Shivani Koul and Sandeep Singh
Abstract
The use of wireless networks has widely increased beyond simple text and data transmission. With the increasing need for transmission of audio and video data across networks (wired and wireless alike), the need to enhance the Quality of Service (QoS) of multimedia transmission has also increased. Wireless networks offer the benefits of increased productivity, easier network expansion, flexibility, and lower the cost of ownership. On the other hand, wireless data networks present a more constrained communication environment compared to wired networks. Because of fundamental limitations of power, available spectrum and mobility, wireless data networks tend to have less bandwidth, more latency, less connection stability, and less predictable availability. While fundamentals of communication and security of wired and wireless networks are largely similar, the limitations of WLANs impose more constraints on the quality of service and security of wireless networks. The deployment of VoIP over WLANs however poses significant challenges and may raise several deployment issues. In this paper, two different experimental scenarios have been considered and various observations have been made during the course of simulation. These two experimental scenarios are based on horizontal and vertical handoff. These two scenarios have been simulated using OPNET simulator.