Optimization of concurrent VOIP calls across Wireless Mesh Networks
Olorunnisola, Olusola
Olorunnisola, Olusola
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Abstract
Voice over IP (VoIP) is an emerging technology with huge potential. The need for wider coverage which we are accustomed to in circuit-switching telephone communications i.e., Global System for Mobile communication (GSM) and Code-Division Multiple Access (CDMA) has brought about transmission of the Voice over Wireless Mesh Networks (VoWMN). The VoWMN implementation faces many problems due to limited bandwidth availability, jitter, and interference (both internal and external). Even so, it has some benefits such as the ease of deployment, expansion, wider coverage, and reduction in cost over voice communication. In this study, the adaptive VOIP optimization algorithm was designed, implemented, and evaluated based on the following parameters, namely, packet loss, network throughput, jitter, and latency. The proposed algorithm was compared with three existing VoIP schemes: 1) end-to-end aggregated traffic, 2) ROHC compressed-only traffic, and 3) plain traffic without aggregation or compression. The various performance measurements in the experiments were captured using the seventh.cc data-capture module which was introduced in Network Simulator - 3 (NS-3). Data analysis was achieved using Python, and the metrics were then plotted using Gnuplot.The proposed algorithm performed better than all other algorithms in the following test categories: jitter, packet loss, and throughput. However, the algorithm had the lowest performance in latency, with the highest latency at 31.59; whilst the scheme with the lowest had 18.43, a difference of 13.16mbps. Packet loss was lower than the compared algorithms. The algorithm had only 1.4% packet loss and jitter of 0.62435ms which was also the lowest among the schemes. The adaptive VOIP optimization algorithm produced a better network throughput than the other schemes. In this study, the mean opinion score (MOS) was calculated. The MOS measures the quality of the call using packet loss rate, latency, the R-factor, and jitter. The proposed algorithm scored 4.103 which is very good VoIP quality. Thus, we believe that we have achieved the main objective of this study; hence, the work will find applications in industries, society, and academia.
Description
Submitted in partial fulfilment of the requirements for the degree of Master of Computing in Information Technology, Department of Information Technology in the Faculty of Information and Communication Technology at the Tshwane University of Technology.
Date
2022-11-01
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Keywords
Adaptive VOIP optimization algorithm., Compression, Aggregation., MOS., GSM., ROHC., VoWMN.