Master’s Thesis:
Performance of
Multimedia
Services in
Packet Switched
Mobile Networks
Sami Ehoniemi
sami.ehoniemi@teliasonera.com
24 July, 2016
1
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
24 July, 2016
2
Presentation Outline
• Motivation & Background
• Objectives & Methodology
• Thesis Contents
• Measurements
• Conclusions
24 July, 2016
3
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
24 July, 2016
4
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
24 July, 2016
5
Thesis Contents
1. Introduction
2. Introduction to Mobile Networks
3. Overview of Messaging Services
4. Factors Affecting MMS Performance
5. IP Multimedia Subsystem (IMS)
6. IMS Case Study: MENSA PoC
7. Measurements
8. End-user Performance Analysis
9. Conclusions
24 July, 2016
6
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
24 July, 2016
7
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
24 July, 2016
8
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
24 July, 2016
9
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
24 July, 2016
10
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
24 July, 2016
11
Thank You!
24 July, 2016
12