Voice and Video over IP (VVoIP) Traffic Studies

We have conducted several studies to characterize and model traffic behavior of the three classes of VVoIP applications: (i) One-way (e.g. Video streaming), (ii) Interactive (e.g. Videoconferencing) and (iii) Interactive + Control (e.g. IPTV, Tele-microscopy). The characterization and modeling primarily involved studying packet-size distributions, inter-packet times and Mean Opinion Score rankings. The ultimate purpose of the above studies was to understand how the VVoIP end-user Quality of Experience (QoE) was affected by different device (e.g. codec, loss-concealment scheme) and network (e.g. bandwidth, jitter) factors. To obtain data for analysis, we setup several LAN and Internet VVoIP application testbeds. One of our notable testbeds produced a collection of over 300 videoconferencing traffic traces from 26 sites in 14 countries. We are currently leveraging our traffic characterization and modeling studies for developing objective video quality assessment techniques that enable auto-assessment of end-user QoE without actual human intervention.
Figure: End-to-End Model View of VVoIP System

Figure: End-to-End Model View of VVoIP System



Prasad Calyam, Eylem Ekici, Chang-Gun Lee, Mark Haffner, Nathan Howes, "A 'GAP-Model' based Framework for Online VVoIP QoE Measurement", Journal of Communications and Networks (JCN), 2007. [pdf]

Prasad Calyam, Mark Haffner, Eylem Ekici, Chang-Gun Lee, "Measuring Interaction QoE in Internet Videoconferencing", IEEE/IFIP Management of Multimedia and Mobile Networks and Services (MMNS), Proceedings published in Springer-Verlag Lecture Notes in Computer Science, 2007. [pdf]

Khaled Salah, Prasad Calyam, Mohammed Buhari, "Assessing Readiness of IP Networks to Support Desktop Videoconferencing using OPNET", Elsevier Journal of Network and Computer Applications (JNCA), 2006. [pdf]

Prasad Calyam, Chang-Gun Lee, “Characterizing Voice and Video Traffic Behavior on the Internet”, International Symposium on Computer and Information Sciences (ISCIS), Proceedings published by Imperial College Press in a special edition of "Advances in Computer Science and Engineering" series, 2005. [pdf]

Andrei Sukhov, Prasad Calyam, Warren Daly, Alexander Illin, “Towards an Analytical Model for characterizing behavior of High-Speed VVoIP applications",  TERENA Networking Conference (TNC), 2005. [pdf]

Andrei Sukhov, Prasad Calyam, Warren Daly, Alexander Illin, "Network Requirements for High-Speed Real-Time Multimedia Data Streams",  IPv6 Global Summit, 2004. [pdf]

Prasad Calyam, Weiping Mandrawa, Mukundan Sridharan, Arif Khan, Paul Schopis, “H.323 Beacon: An H.323 application related end-to-end performance troubleshooting tool”, ACM SIGCOMM Workshop on Network Troubleshooting (NetTs2004), 2004.[pdf]

Prasad Calyam, Mukundan Sridharan, Weiping Mandrawa, Paul Schopis “Performance Measurement and Analysis of H.323 Traffic”, Passive and Active Measurement Workshop (PAM) Proceedings published by Springer in Lecture Notes in Computer Science, 2004. [pdf]