Abstract
Due to the advancement of technology in recent years, there has been a significant increase in the usage of bandwidth-consuming real-time applications such as VoIP, web-streaming. To cater to these ever increasing modern networking demands, Software-Defined Networking (SDN) is considered as the main structure for the future networking. We have analyzed and compared the QoS performance over conventional network and SDN, using Riverbed Modeler and Mininet Emulator, respectively, by considering eight different VoIP call scenarios based on the combination of voice codecs and call-type. The results for a single VoIP call scenarios showed 6 to 13 percent improvement in the throughput performance. In the case of concurrent VoIP calls, SDN can effectively handle congestion due to the efficient bandwidth utilization and the presence of a proactive centralized controller, resulting in improved QoS performance of VoIP in terms of throughput, jitter, packet loss and Mean Opinion Score (MOS).
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