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- 1. Adaptive High-quality Video Service for Network-based Multi-party Collaboration 19 th Oct 2005 Sangwoo Han [email_address] Networked Media Lab., Dept. of Information and Communications Gwangju Institute of Science and Technology (GIST), Korea Graduate Workshop on Networking
- 2. Contents Introduction Background AG Media architecture Evaluation Conclusion Q & A
- 3. Introduction Terminologies Advanced Collaborative Environments (ACE) Bring together the right people and the right data at the right time to perform a task, solve a problem, or simply discuss something of common interest. Quality of Experience (QoE) A factor to evaluate satisfaction of the users in the context of the collaboration tasks. Motivations How to improve QoE in ACE? High-quality video support How to remove barriers preventing high-quality video support, such as network variation and heterogeneity problem? Network monitoring and adaptation
- 4. Target Application: Access Grid What is Access Grid (AG)? (from the Access Grid web site) An ensemble of resources including multimedia large-format displays, presentation and interactive environments, and interfaces to Grid middleware and to visualization environments. These resources are used to support group-to-group interactions. The Access Grid thus differs from desktop-to-desktop tools that focus on individual communication. Features Multiple video/audio streams and unlimited number of participants (in theory) Open source software Centralized and (mostly) public meeting “locations” Uses multicast-enabled networks Shared applications, data, and services
- 5. Access Grid in Action Smart AG node AG Node architecture
- 6. Design of AG Media Architecture Design consideration Service-capability negotiation defines a protocol of exchanging service capabilities between participants. Application-layer QoS control resolves network problem points by rate control Main components AG Media Arbitrator manages AG media interfaces, negotiates service capabilities between AG media arbitrators, and achieves QoS control AG Media Interface accesses to the video resources provided by adaptive video applications on a local machine
- 8. AG Media Arbitrator and Interface
- 9. Adaptation Manager of AG Media Arbitrator
- 10. Implementation Service-capability negotiation Session description by SDP (session description protocol) Session announcement by SAP (session announcement protocol) Versatile video support DV and its application 720x480 DV-encoded 30Mbps digital video by using DVTS HDV and its application 1280x720 MPEG2-encoded 19.2Mbps high-definition digital video by using VLC
- 11. Implementation (cont’) Application-layer QoS control Principle of one-to-one performance evaluation If packet loss rate of each receiver is greater than a pre-defined loss threshold, the receiver suffers quality deterioration. By this simple principle, every receiver is classified into two nodes having overload or proper load. Guide to rate control considering one-to-many video distribution If the proportion overloaded nodes to total nodes is not less then the pre-defined threshold TH max , frame rate is reduces. If the proportion of loaded nodes to total nodes is not less than the pre-defined threshold TH min , the frame rate is increased. Execution of adaptive transmission The adaptation manager allows adapative video applications to regulate drop rate – 0%, 33%, and 50%, and the adaptive video applications control frame rate by frame dropping.
- 12. Sequence diagram of network adaptation
- 13. Implementation results AG node enabling HDV service AG with AG Media
- 14. Test bed for network-adaptation experiments DV sender DV receiver 1 DV receiver 2
- 15. Experiment environments Experiment scenario No condition Network load Experiment parameters loss threshold = 15% TH max = 0 and TH min = 100 Test machine specifications DV sender Desktop equipped with Intel 2.8GHz CPU and 512MB RAM DV receiver 1, 2 DELL D800 laptop equipped with Intel 1.7GHz mobile CPU and 512MB RAM
- 16. Experiment result Network load No condition No condition
- 17. Conclusion Conclusion Designing AG Media Architecture to enabled DV and HDV support with application QoS. Implementing the prototype associated with Access Grid. Verifying better users’ quality of experience by demonstration on the test bed. One-to-many network adaptation scheme conceals quality variation resulted from network problems.
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- 19. Q & A High-quality video service on AG is available from http:// nm.gist.ac.kr/agdv