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Research Projects (1) FutureComm: Serving Society (http://futurecomm.tssg.org) funded by the Higher Education Authority (HEA) under the Programme for Research in Third-Level Institutions (PRTLI) Cycle 4, Ireland (2009 April - To date) Peer-to-Peer Streaming • Develop new algorithms to improve performance of mesh-based (hybrid pull-push) P2P streaming using network-level performance parameters (as a desirable factor). User's participation history is also considered to stabilise the overlay structure (as a time decaying factor). Currently simulate a congestion-aware parent-initiated peer adaptation algorithm against the block-aware child-initiated peer adaptation algorithms Download OMNET++ simulation code: Sub-streamed P2P • Examine a system to profitably share long-lived high-bandwidth IP sessions like linear HDTV channels among geographically proximate users. Proximate users in a community will be awaken by the participation of others with incentives. Media delivery technologies be used are P2P in the public Internet and IP multicast in IPTV networks. It is expected to minimise traffic in the Internet core and access networks. IP-based TV customers in user-provided networking, which is becoming a major networking paradigm to federate the inner network requirements, will directly be beneficial and provide opportunities to deploy this system. Research Interests • IP-based Video Transport My broad research interest in IP-based video transport currently focuses on multiparty communication using peer-to-peer in the public internet and multicast in IPTV networks. I am conducting research under the themes of congestion control and quality of service using simulations and testbed investigations. I am working on sub-stream based video delivery approach (used in CoolStreaming) and traffic optimisation in peer-to-peer networking. Congestion-aware parent-initiated peer adaptation techniques are being investigated against block-aware child-initiated techniques. In-network capability of IP multicast is explored for service proximity discovery in IPTV networks, which could enhance opportunities in QoS, Social TV and user-provided networking. An ISP edge-supported protocol mechanism to enforce layered multicast congestion control (IETF ALC framework) using ECN-nonce has been implemented protecting the network from misbehaving receivers. In addition some issues like excessive overshoot problem in single-rate multicast congestion control (TFMCC in NORM framework), unnecessary congestion responses in layered multicast and multicast congestion control in fast-long distance networks have been introduced and investigated. A topology-aware admission control system, which was a centralised approach using a Bandwidth Broker, has been prototyped for QoS networks using IETF DiffServ architecture. • Wireless Sensor and Actuator Networks My main interest is to exercise wireless sensor and actuator networks in novel applications for energy efficiency and healthcare. User awareness and pre-preparation is in current focus. Experiment and re-design of TCP/IP protocols for the low-power low-rate networks like IEEE 802.15.4 is also a focal point (in an embedded systems environment). Useful Resources • Tutorial: Experimental Data Analysis for Network Researchers Publications Journals: 1. Elsevier Computer Networks, “Enforcing Layered Multicast Congestion Control using ECN-Nonce”, vol 55(3), pp 489-505, February 2010, Chamil Kulatunga, Gorry Fairhurst Conferences: 1. International Conference on Broadband Communications, Networks, and Systems (ICST/BroadNets 2010), Athens, Greece, "Analysis of Block-aware Peer Adaptations in Substream-based P2P”, Chamil Kulatunga, Dmitri Botvich, Sasitharan Balasubramaniam, William Donnelly 2. International Workshop on Satellite and Space Communications (IEEE/IWSSC 2009), Siena-Tuscany, Italy, "Performance Impact of ECN on Multimedia Traffic with Satellite Delay”, Nimbe Ewald, Chamil Kulatunga, Gorry Fairhurst 3. International Conference on Communications (IEEE/ICC 2008), Beijing, China, “TESLA with FLUTE over Satellite Networks”, Lei Liang, Haitham Cruickshank, Zhili Sun, Chamil Kulatunga, Gorry Fairhurst 4. International Workshop on Protocols for FAST Long-Distance Networks (IRTF/PFLDnet 2008), Manchester, UK, “Nonlinear Adaptive Layered Multicast Congestion Control for Fast Long-Distance Networks”, Chamil Kulatunga, Gorry Fairhurst 5. International Workshop on Satellite and Space Communications (IEEE/IWSSC 2007), Salzburg, Austria, “Delay-based Sub-grouping for NORM in Heterogeneous Networks”, Chamil Kulatunga, Gorry Fairhurst 6. International Workshop on Satellite and Space Communications (IEEE/IWSSC 2006), Madrid, Spain, “TFMCC Protocol Behaviour in Satellite Multicast with Variable Return Path Delays”, Chamil Kulatunga, Gorry Fairhurst 7. Postgraduate Symposium in the Convergence of Telecommunications, Networking and Broadcasting (EPSRC/PGNet 2006), Liverpool, UK, “Avoiding Unnecessary Congestion Responses in Layered Multicast with Heterogeneous Receivers”, Chamil Kulatunga, Gorry Fairhurst 8. International Workshop on Inter-domain Performance and Simulation (IPS 2004), Budapest, Hungary, “Implementation of a Simple Bandwidth Broker for DiffServ Networks”, Chamil Kulatunga, Jesse Kielthy, Paul Malone, Micheal O Foghlu 9. Information Technology and Telecommunication Conference (IT&T 2003), Letterkenny, Ireland, “An Evaluation of QoS Provisioning for UBR Applications in a DiffServ Network”, Jesse Kielthy, Chamil Kulatunga, Richard Frisby, Micheal O Foghlu 10. International Workshop on Inter-domain Performance and Simulation (IPS 2003), Salzburg, Austria, “Measurement based Adaptive QoS Management in DiffServ Networks”, Chamil Kulatunga, Paul Malone, Micheal O Foghlu 11. Information Technology and Telecommunication Conference (IT&T 2002), Waterford, Ireland, “Quality of Service and Security in IP-Based Telecommunications Services”, Marry Nolan, Chamil Kulatunga, Micheal O Foghlu Book Chapters: 1. “After the Tsunami: Relief and Rehabilitation in Sri Lanka” edited by Manfred Domroes, “Regional Disaster Communications Network”, Chapter 14, pp 202-217, Kandasami Pirapaharan, Chamil Kulatunga, Thambu Kuganeshwaran, Mosaic Books, New Delhi, India, 2006 Education • PhD, Electronics Research Group, School of Engineering, University of Aberdeen, UK, May 2009, Thesis: "Enforcing Receiver-driven Multicast Congestion Control using ECN-Nonce" (Supervised by Prof. Gorry Fairhurst) • MSc, Telecommunications Software and Systems Group, Waterford Institute of Technology, Ireland, September 2003, Thesis: "Ensuring End-to-end QoS in IP Networks: Design and Implementation of a DiffServ Bandwidth Broker" (Supervised by Dr. Willie Donnelly) • BSc in Engineering, Department of Electronic and Telecommunication Engineering, University of Moratuwa, Sri Lanka, January 1999 Past Projects 1. SatNex: Satellite Communications Network of Excellence, funded by the European Commission IST FP6 (2008-2009) 2. HMCast: Satellite-based Secure Multicast Employing Hybrid Reliability, funded by the Engineering and Physical Sciences Research Council, UK (2005-2008) 3. Converge: QoS, Security and Accounting, funded by the Council of Directors of Institutes of Technology, Ireland (2001-2004) Past Experiences • Lecturer, Department of Electrical and Information Engineering, University of Ruhuna, Galle, Sri Lanka (2001-2005) • Systems Engineer, IT Division (Billing), Suntel Limited, Colombo, Sri Lanka (2000) Related Links • Internet Engineering Task Force (IETF) • European Future Internet Portal • Science Foundation Ireland (SFI) • OMNET++
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