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Master’s Thesis:

Master’s Thesis:. Performance of Multimedia Services in Packet Switched Mobile Networks. Sami Ehoniemi sami.ehoniemi@teliasonera.com. Basic Information. Title: Performance of Multimedia Services in Packet Switched Mobile Networks Supervisor: Professor Timo Korhonen Instructor:

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Master’s Thesis:

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  1. Master’s Thesis: Performance of Multimedia Services in Packet Switched Mobile Networks Sami Ehoniemi sami.ehoniemi@teliasonera.com

  2. Basic Information • Title: Performance of Multimedia Services in Packet Switched Mobile Networks • Supervisor: Professor Timo Korhonen • Instructor: Mika Raitola, M.Sc. • Place of work: TeliaSonera Finland – Emerging Technologies and Innovations

  3. Presentation Outline • Motivation & Background • Objectives & Methodology • Thesis Contents • Measurements • Conclusions

  4. Motivation & Background • GPRS brought Packet Switched data services to GSM networks • Several new services possible • 3G UMTS developing towards an all IP network • IMS platform • Past ARPU from voice calls and SMS • Future growth from value added services incl. multimedia and messaging services • Performance acceptance of multimedia services a major challenge • Operators concerned with the proper functioning of the services and the effective use of the network

  5. Objectives & Methodology • Objective was to evaluate: • GPRS network possibilities, challenges and problems • Functioning and performance of a couple of services: MMS, Photoshare, IMS PoC, and Fastchat • Effects of the services to the mobile network (GPRS, EDGE) • Methodology: • literary study based on 3GPP, OMA, and MENSA specifications, several books and conference articles • Measurements of several services

  6. Thesis Contents • Introduction • Introduction to Mobile Networks • Overview of Messaging Services • Factors Affecting MMS Performance • IP Multimedia Subsystem (IMS) • IMS Case Study: MENSA PoC • Measurements • End-user Performance Analysis • Conclusions

  7. Measurements (1/2) • MMS performance tests with several GPRS and EDGE terminals • MMS transmission divided into several time periods (GPRS connection delays, UL and DL transmission delay, MMSC delay) • UL and DL transmission rates • MMS roaming tests • IMS Photoshare performance tests with GPRS terminals • Comparison to MMS • Session establishment and image transmission delays • Statistics of HTTP and SIP traffic

  8. Measurements (2/2) • IMS Push-to-talk over Cellular (PoC) • Two test sessions with GPRS and EDGE terminals • Session 1: Understanding of the overall PoC traffic • Session 2: MENSA consortium specified delay values (Session control establishment, floor control, voice transfer) • Fastchat Push-to-talk service • Comparison to MENSA consortium specified PoC • Voice delay values measured

  9. Conclusions (1/3) • GPRS presents a challenging environment for achieving good application performance • Long and variable network delay • Low and variable network throughput • Difficult for interactive services • EDGE brings capacity and throughput improvements, but not delay improvements • UMTS provides much smaller network latency and improved throughput

  10. Conclusions (2/3) • Main factors affecting the MMS performance: • Terminal Multislot Class (maximum number of simultaneous GPRS or EDGE timeslots), dedicated GPRS capacity • Additional transmission throughput with EDGE • Transport protocol stack (WAP 2.0 better than WAP 1.2.1) • Always GPRS attached mode cut the GPRS connection time • Notification method (SMS notification slow) • Longer GPRS connection and UL transmission delays with a roaming terminal • Measured delays within the proper limits for a non-real-time service

  11. Conclusions (3/3) • Photoshare an effective way to share media (images, etc.) • Image transmission from terminal to terminal faster than with MMS • High GPRS connection delays of MMS • Long notification delay of MMS • MENSA specified PoC delays achievable (low variance) • SIP signaling compression highly justified • IP/UDP (RFC2507) and RTP/UDP/IP (ROCH RFC3095) header compression methods should be examined • EDGE brings capacity improvement and session control • Need for GPRS QoS with PoC • Fastchat voice delays longer due to long server delay

  12. Thank You!

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