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Enhancing Application Level Multicast for P2P Conferencing

Enhancing Application Level Multicast for P2P Conferencing. Xiaotao Wu Krishna Kishore Dhara Venkatesh Krishnaswamy Avaya Labs Research. P2P Conferencing. GOAL: Scalable P2P conferencing Existing Approaches -- all participants should mix IP Multicast deployment Full Mesh

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Enhancing Application Level Multicast for P2P Conferencing

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  1. Enhancing Application Level Multicast for P2P Conferencing Xiaotao Wu Krishna Kishore Dhara Venkatesh Krishnaswamy Avaya Labs Research

  2. P2P Conferencing GOAL: Scalable P2P conferencing Existing Approaches -- all participants should mix • IP Multicast • deployment • Full Mesh • bandwidth intensive, not scalable • ALM • only considers bandwidth and transmission latency, did not consider mixing capability Our Solution – Hybrid ALM P2P Conferencing • Enhance ALM to leverage conference specific behavior – mixing capability • Three step bottom up algorithm to construct ALM tree • Performance testing that shows the scalability improvements

  3. Hybrid ALM Solution for P2P Conferencing Built a prototype to study various P2P conference architectures on Avaya 4620SW IP Phones acting as various nodes in a conference

  4. Testing results Layered Mesh Centralized Latency Quality

  5. Testing results Participants Architecture Latency (ms) Quality 9 centralized 740-1930 < 3.17 9 full-mesh 464 8.278 9 layered/hybrid 74-218 8.438-8.853 15 layered/hybrid 102-416 8.37-8.85

  6. b ab a b a ab a b Constructing a conference E A F C Nerada Bridging B D G Require global information Difficult to control Needs to know bridging nodes’ mixing capability

  7. Redefine the goal (future work) • Minimizing the number of audio mixing nodes • easier for conference control • Minimizing the number of signaling messages to establish and maintain a conference • No global information required • Acceptable latency and quality • good but not best

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