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End-to-End Quality of Service in Distributed Information Systems

End-to-End Quality of Service in Distributed Information Systems. Marco Alfano Marco.Alfano@cselt.it. QUTE’98 Workshop. Heidelberg, 14-15 October 1998. Outline. QoS Present Issues Qos Trends Possible QoS Solutions: The CME project A possible new EURESCOM project on QoS Conclusions.

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End-to-End Quality of Service in Distributed Information Systems

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  1. End-to-End Quality of Service in Distributed Information Systems Marco Alfano Marco.Alfano@cselt.it QUTE’98 Workshop Heidelberg, 14-15 October 1998

  2. Outline • QoS Present Issues • Qos Trends • Possible QoS Solutions: • The CME project • A possible new EURESCOM project on QoS • Conclusions

  3. QoS Present Issues • Present technology makes implementation of QoS feasible • Main costs involved are not fixed costs (lines, devices) but recurring costs (signalling, routing, policy, billing, accounting, etc.) • QoS parameters should be minimised • it is complex specifying them, monitoring them, enforcing them, etc. • Still high uncertainty on QoS cost/benefit ratio

  4. Edge Network Edge Network Backbone Network QoS Trends • Performance guarantees on the edge networks (e.g., RSVP) • Prioritisation of traffic on the backbone (e.g., IETF differentiated services)

  5. QoS Trends (cont’d) • Services/applications characterised by a few QoS classes • QoS classes mapped to network-service classes (e.g., IETF differentiated services) • Different classes must entail different prices Charging can make QoS to become a reality!

  6. Possible QoS Solutions • Cooperative Multimedia Environment (CME) Project (ICSI, Berkeley, 1996) • A potential new EURESCOM project on QoS: QoS methodologies and solutions within the service framework: Measuring, managing and charging QoS (September 1998)

  7. CME Project: Motivations • World-wide collaboration: Universities, research institutes, companies • Videoconferences and shared applications (e.g., Mbone Tools) • Problems: • No common user interface • No integrated management • No QoS guarantees

  8. CME Project: Main Features • A Cooperative Multimedia Environment (CME): • Common graphical user interface • Support of QoS requirements • Application sharing and audio/video communication • Integrated management of host and network resources

  9. User User Connection Interface Manager Media Service 1 User Host COMMA QoS Mapper/ Service Host Media Service 2 Controller Manager COMMA Network . . Resource . User Monitor/Controller Media Service n Host COMMA CME Project: CME Architecture COMMA : Cooperative MultiMedia Application

  10. User High or Low Quality Video Application Video Frame Rate Network Host % CPU Bandwidth CME Project: QoS Model • Users must be able to express QoS requirements in familiar terms • A three layers model

  11. CME Project: QoS Model • User level • User expectations should be expressed in quantitative terms • Analysis on user expectations is highly subjective • A five-level scale can be used for quality rating • The scale is based on double stimulus methods

  12. CME Project: QoS Model • User level • One global requirement, Quality, for each media (e.g., video quality) • Quality is a repository of more specific requirements (e.g., spatial and temporal vision quality) • User-Application Mapping • Tests must be executed to rate quality of video and audio sequences • Application-Resource Mapping • Only an estimation is possible

  13. CME Project: QoS Mapping • User-Application Mapping Video (JPEG) Audio

  14. CME Project: QoS Mapping • User-Application-Resource Mapping Video (JPEG) Audio

  15. CME Project: CME Prototype • Connection Manager • Unix Sockets • Resource Monitoring • Iostat for CPU load • RTP for network bandwidth • Distributed Platform • Sun Solaris and TCP/IP • COMMA Database • Mini SQL • Media Services • MBone Tools (vic, vat, wb) • User Interface • Tcl/Tk

  16. CME Project: CME Prototype • User Interface for connection mangement

  17. CME Project: CME Prototype • User interface for session control

  18. Open Issues • Better understanding of user requirements • QoS specification by the user in terms of QoS Classes? • Mapping of user requirements into application parameters and system resources • How network (and hosts) guarantee the QoS levels (classes)? • QoS charging

  19. A possible new EURESCOM project on QoS • QoS methodologies and solutions within the service framework: Measuring, managing and charging QoS • The title should become: • QUASIMODO (QUAlity of ServIce MethODOlogies and solutions): Measuring, managing and charging QoS

  20. User QoS Classes Application Measurements Application Resource Measurements Network Host Project Proposal: Objectives • QoS model definition • Different QoS Classes for different applications, users

  21. Project Proposal: Objectives • Parameters correlation for some meaningful applications • Methodologies and tools for QoS measurement and management • Charging methodologies and policies for QoS charging • Experimental evaluation and validation of QoS solutions Integrated QoS measurement, management and charging

  22. PPD Supporting Shareholders • CSELT (IT) • Deutsche Telekom AG (DT) • Telecom Ireland (TI) • Finnet Group (AF) • Portugal Telecom (PT) • MATAV Hungarian Telecom (HT) • British Telecom (BT)

  23. Conclusions • QoS present issues • QoS trends • A Cooperative Multimedia Environment (CME) • QoS specifications by the user • A potential new EURESCOM project on QoS • A three layers QoS model • Integrated QoS measurement, management and charging

  24. For Further Information • CME Project • Web Site: http://www.icsi.berkeley.edu/~alfano/cme/cme.html • Paper: Design and Implementation of a Cooperative Multimedia Environment with QoS Control, Computer Communications, Vol. 21, pp 350-361 • PP9212 (PPD) • QoS methodologies and solutions within the service framework: Measuring, managing and charging QoS

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