-- QoE Workshop QoE Quantification & Feedback Markus Fiedler, Blekinge Institute of Technology, Dept. of Computing (COM), Karlskrona, Sweden

Who we are COM/CCS Markus Fiedler Patrik Arlos Lars Lundberg ING Hans-Jürgen Zepernick Ph.D. COM/CCS Charlott Eliasson Alex Popescu Tahir Nawaz Minhas Junaid Shaikh Hussein Aziz Ph.D. ING Ulrich Engelke et al.. 2

Our current QoE-related projects QoEMoVi/QoEMoS– mobile video/streaming QoEWeb– user patience (Euro-NF) –Testbed available Mobicome– authentication EViMonA– seamless communication PERIMETER– seamless communication Euro-NF –IA.7.5 workshop on socio-economic issues 3

Recent and upcoming activities 18 th ITC Specialist Seminar on QoE Annals of Telecommunications Special Issue on QoE and socio-economic issues of network- based services (to be finalised) Dagstuhl seminar From QoS to QoE/QoX Euro-NF Ph.D. course in January 2010 Euro-NF Workshop on Socio-Economic Issues in NF (autumn 2010) 4

Areas of interest Real-life QoE assessment (new) QoE–QoS relationships –How to quantify QoE as function of QoS? –dQoE/dQoS ~  QoE  exponential function Improvement of QoE –Cross-layer approaches –Choice of networks (seamless communications) –Service chains –QoE feedback 5

Some recent ”exponentials” for surfing Download time T ~ a 1 exp(b 1 L) L = loss ratio Throughput R ~ a 2 exp(–b 2 L) QoE ~ a 3 – b 3 L or QoE ~ a 4 exp(–b 4 L) QoE ~ a 5 exp(– b 5 T) or QoE ~ a 6 – ln(b 6 L) QoE ~ a 7 + b 7 ln(R)

QoE feedback In case of problems Mostly implicit –Organised? –Trustworthy? Origin: work within EuroNGI [D.WP.JRA.6.1.1]

8 … and its importance [HP study 2000] Understanding that there’s a lot of people coming together on the process makes us more tolerant I think it’s great...saying we are unusually busy, there may be some delays, you might want to visit later. You’ve told me now. It I decide to go ahead, that’s my choice. As long as you see things coming up it’s not nearly as bad as just sitting there waiting and again you don’t know whether you’re stuck

Specific topic: QoE feedback Towards users –When? How? Effects? Trust? Towards providers/regulators –When? How? Use? Economics? From the user (end) –When? Where? How? Implicit? Explicit? Physiological? Economic feedback –Interest? Basis? Instruments? Misuse? 9

-- Questions and Discussion QoE Quantification & Feedback Markus Fiedler, Blekinge Institute of Technology, Dept. of Computing (COM), Karlskrona, Sweden