Definition of QoE Interfaces for Virtual Networks. Selami Ciftci September 2011

Transcription

1 Definition of QoE Interfaces for Virtual Networks Selami Ciftci September

2 Agenda 2

3 Network Virtualization Concept Management of Virtual Networks Virtual Networks Provisioning of Virtual Networks Virtualized Substrate Virtualization of Resources Physical Infrastructure 3

4 Roles and Players End User Virtual Network Operator (VNO) Service Providers (SP) Virtual Network Provider (VNP)) Infrastructure Provider (InP) Infrastructure Provider (InP) Infrastructure Provider (InP) 4

5 What QoE means Definition overall acceptability of an application or service, as perceived subjectively by the end-user. Quality of Experience includes the complete end-to-end system effects (client, terminal, network, services infrastructure, etc.). Overall acceptability may be influenced by user expectations and context QoE for operators Less customer churn Optimum usage of resources QoE instead of QoS based charging Differentiating services and requirements Better suited for end user centric pricing 5

6 Dimensions of QoE Quality of Service (QoS) Application Layer QoS Network Layer QoS MAC Layer QoS End User s Subjective Preferences/Evaluations Personal quality preferences/expectations Context Environment Access device Content 6

7 QoE Centric Virtual Networks The decoupling nature of virtual networks Functional separation of infrastructure and virtual network Running isolated multiple networks at the same time over a shared substrate Dynamic resource allocation Instantiation of virtual networks tailored to a particular service and/or end user along with efficient usage of resources Adaptation to changing network conditions in different virtual networks sharing the same substrate NV standardization efforts in their infancy 7

8 Definition of QoE Interfaces VNO / InP QoE - Network Layer QoS Mapping Network Layer parameters: packet loss, bandwidth, delay, jitter Adjusting end-to-end routes of virtual networks based on network conditions VNO / SP QoE - Application Layer QoS Mapping Application Layer parameters: content resolution, frame rate, codec type VNO / End User Getting end user s subjective preferences/evaluations Capturing contextual information Determining the level of quality satisfying end user 8

9 QoE Interfaces End User SP VNO VNP InP InP InP 9

10 Challenges Virtual Networks Accountability who is responsible for what Isolation of resources and scalability QoE will increase the tension between two Heterogeneity of infrastructure domains positive or negative from QoE perspective Configuration and operation complexity proportional to varying QoE levels QoE Gaps between network measured quality and user perceived experience Mechanisms to take into account end user s subjective preferences/evaluations in QoE metric Mechanisms, procedures and tools to continuously monitor, operate and report QoE indicators 10

11 Standardization Efforts IRTF Virtual Networks Research Group (VNRG) The initial set of work items includes topics such as concepts/background/terminology, common parts of VN architectures and common problems/challenges in VNs. ITU-T Focus Group on Future Networks Isolation, Performance, Scalability, Flexibility, Evolvability, Management and Security are the identified problem spaces. 11

12 What could be standardized The interface between VNO / End User to get contextual information and feedback QoE as a combination of QoS The interfaces between VNO / InP and VNO / SP Mechanisms, procedures and tools to continuously monitor, operate and report QoE indicators in virtual networks 12

13 TT s Plan Closely following advances in network virtualization technology From business and operations perspective, Turk Telekom will look for emergence of sound business models sufficient number of vendors investing in interoperable products seamless transition from legacy networks to virtual networks is possible 13

14 References R. Bless, S. Baucke, Network Virtualization within FP7 EU Project 4WARD Network of the Future ITU-T SG 12 (2007) Definition of quality of experience. COM12-LS 62-E, TD 109rev2 (PLEN/12). Geneva, Switzerland, Jan 2007 D. Soldani, M. Li and R. Cuny, QoS and QoE Management in UMTS Cellular Networks, John Wiley & Sons (2006) P. Reichl, From charging for Quality of Service to Charging for Quality of Experience, Annals of Telecommun., vol. 65, no. 3 4, Apr , pp J. Carapinha, P. Feil, P. Weissmann, S.E. Thorsteinsson, C. Etemoglu, O. Ingprsson, S. Ciftci, M. Melo, Network virtualization - opportunities and challenges for operators", Proceedings of the Third future internet conference on Future internet, Berlin, Germany, 2010 Internet Research Task Force (IRTF) Virtual Networks Research Group (VNRG) Terms of Reference of ITU-T Focus Group on Future Networks, 14

15 Thank you 15