Performance Of Voice Over Internet Protocol (VOIP) In Wireless Local Area Network (WLAN)

Ong , Jaw Feei (2007) Performance Of Voice Over Internet Protocol (VOIP) In Wireless Local Area Network (WLAN). Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

In this project, the suitability of 802.11 b networks to carry real time voice traffic communication will be assessed using the Internet Protocol, where in the network the voice session have to share the link with data, video and voice. Measurements of the quality of voice are performed in the 802.11 wireless networks compared to the wired kind of network. Measurements are focused on the three major Voice over Internet Protocol (V oiP) parameters: loss, delay and jitter. The environment factors such as the distance between nodes, network traffic and other obstacles are also being considered when carrying out this research. Due to the unpredictable nature of the wireless environment, providing Quality of Service (QoS) service is a challenging task. Voice traffic is more susceptible to the three major performance QoS parameters: delay, jitter and packet loss in the wireless domain than data traffic. In order to ensure the QoS of VoiP in wireless LAN, some experimental investigations have been carried out to test on the performance limitations in establishing VoiP in wireless LAN. All these experimental testing have been done under three varying scenarios network which are working under an ideal and real condition. The analysis is based upon the software that are being used in this project, ClearSight analyzer and Ethereal, from packet loss, jitter and delay measurements. According to the results, measures and graphs of packet delay, packet jitter and lost packet rate show the performance limitations when VoiP runs in wireless LAN. VoiP is a multimedia application that requires timely servicing of the voice traffic even when using QoS enforcement. As a result, a dedicated bandwidth with several time constraints is the main conditions for VoiP in wireless LAN environment to avoid the degradation of performance of VoiP service in the received signal.

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