Performance of VoIP in Wired-Cum-Wireless Ethernet Network

Performance of VoIP in Wired-Cum-Wireless Ethernet Network

Nurul I. Sarkar (School of Computing and Mathematical Sciences, Auckland University of Technology, Auckland, New Zealand) and Kashif Nisar (School of Computing InterNetWorks Research Laboratory, University Utara Malaysia and School of Computing and Mathematical Sciences, Auckland University of Technology, Auckland, New Zealand)
DOI: 10.4018/jitn.2012100101
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The Voice over Internet Protocol (VoIP) is a rapidly growing technology that enables transport of voice over data networks such as Ethernet Local Area Networks (LANs). This growth is due to the integration of voice and data traffic over the existing network infrastructure, low cost, and improved network management offered by the technology. This paper reports on the performance of VoIP traffic characteristics in a wired-cum-wireless Ethernet LAN. The effect of increasing the number of VoIP wireless clients, different voice codec schemes, and packet arrival distributions on system performance is investigated. Through various simulation experiments under realistic network scenarios, such as Small Office Home Office (SOHO) and campus networks, this paper provides an insight into the performance of VoIP over Ethernet LANs. Simulation results show that VoIP clients and voice codec schemes have significant effect on system performance. The authors preformed OPNET-based simulations to validate their experiments.
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Voice codec generally provide a compression capability to save network bandwidth. Currently, there are various types of audio codecs available for voice applications. The simplest and most widely used codecs are G.711, G.723 and G.729 (Nguyen, Yegenoglu, Sciuto, & Subbarayan, 2001). The simplest encoder scheme is G.711 (64 kb/s). G.711 is the sample base which uses the Pulse Code Modulation (PCM). The acceptable packet loss factor of G.711 is up to 0.928%. In this paper, we consider a simulation scenario to study the performance of G.711, G.723, and G.729.

In reference (Zeadally, Siddiqui, & Kubher, 2004), the authors have studied a large scale WLAN system with about 2000 nodes and have presented most comprehensive trace of network activity. This study can help understand usage patterns in WLANs which are critical for those who develop, deploy, and manage wireless technologies as well as those who develop systems and application software for wireless networks (Salah & Alkhoraidly, 2006; Chou, 2007; Walsh & Kuhn, 2005; Huijie & Xiaokang, 2005; Van de Capelle, Van Lil, Theunis, Potemans, & Teughels, 2001; Baratvand, Tabandeh, Behboodi, & Ahmadi, 2008).

Table 1 lists the key researchers and their main contributions in the performance studies of VoIP over wired and wireless networks.

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