Router Virtualization as an Enabler for Future Internet Multimedia … · 2010-11-24 · Streaming...

KOM - Multimedia Communications Lab

Prof. Dr.-Ing. Ralf Steinmetz (Director)

Dept. of Electrical Engineering and Information Technology

Dept. of Computer Science (adjunct Professor)

TUD – Technische Universität Darmstadt

Rundeturmstr. 10, D-64283 Darmstadt, Germany

Tel.+49 6151 166150, Fax. +49 6151 166152

www.KOM.tu-darmstadt.de

© 2010 author(s) of these slides including research results from the KOM research network and TU Darmstadt. Otherwise it is specified at the respective slide

httc –

Hessian Telemedia Technology

Competence-Center e.V - www.httc.de

Osama Abboud, M.Sc

Prof. Dr.–Ing Ralf Steinmetz

[email protected]

Tel.+49 6151 16 4115

23. November 2010Future_Internet_Hannover___2010.11.22.ppt

Router Virtualization as an Enabler for

Future Internet Multimedia

Applications

KOM – Multimedia Communications Lab 2

Motivation

Evolution of the Internet

Multimedia apps getting more popular

Cisco VNI predicts in 2014: Video

will be 70% of all Internet traffic

More powerful devices with increasing

connection speeds

High definition and 3D content

More load on central instances

Routers, backbones, servers

Media-oriented networks will

become necessary

Source: Cisco Visual Networking Index Forecast 2010


Outline

Motivation

Future Multimedia Systems

System Overview

Scalable Video Coding

Media-aware Networking

Router Virtualization

Data Prioritizing

Evaluation

Scenario

Results

Conclusion


Streaming System - Overview

Peer-assisted architecture

Hybrid server/P2P solution

Tracker with contact information of the peers

Video streaming

Uses the H.264 Scalable Video Coding (SVC)

Video divided into many parts (chunks)

Each chunk consists of multiple video blocks

More blocks are requested to get higher quality

Osama Abboud et al : Quality Adaptive Peer-to-Peer Streaming using Scalable Video CodingIn the Proceedings of the 12th IFIP/IEEE MMNS09 Conference



Video file encoded only once but with different quality levels

Different quality can be requested independently

Scalability in 3 dimensions

Temporal: Frames per second

Spatial: Resolution of the picture

Quality: Quantization levels, sharpness

Enables quality adaptation

Received quality level adjustable according to

Device and connection properties (e.g. resources, screen size, bandwidth)

Network status (congestions, system capacity, availability of required quality blocks,…)


Quality Adaptation

Osama Abboud et al : Quality Adaptive Peer-to-Peer Streaming using Scalable Video CodingIn the Proceedings of the 12th IFIP/IEEE MMNS09 Conference


Why do we need Media Awareness?

Media-aware

Intelligence

Media-aware

Intelligence


Outline

Motivation

Future Multimedia Systems

System Overview


Media-aware Networking


Data Prioritizing

Evaluation

Scenario

Results

Conclusion


Media-aware Multimedia Networks –


Media awareness can be introduced using router virtualization

Why router virtualization?

Quality of service at the application level (optimize (QoE) )

Efficient and custom-made QoS solutions (e.g. live and on-demand streaming)

Enables the gradual development of media aware solutions

Efficient architectures being developed: e.g. Using OpenFlow

Why not classical QoS management solutions, e.g. DiffServ?

QoS controlled by the network provider not the content provider

Heterogeneous QoS algorithms across networks make traffic handling complex

How?

During bottlenecks, the virtual router prioritizes and controls block transfers

Block priority calculated based on various important QoS/QoE metrics


SVC Video Block Prioritization (1)

Temporal aspect reflecting the real time properties of streaming

How soon is the block needed?

Video block near the playback positions are more important

The least need block is the first to be slowed down upon congestions


SVC Video Block Prioritization (2)

Quality aspect reflecting the interdependencies between the layers

How many block depend on a certain block?

E.g. Base layer: all blocks depend on it

The more a block is needed by lower layer, the more priority it gets

BaseTier (0)

Tier 2

Tier 2

Tier 3

Tier 3 Tie

r 3

Tier 1 Tier 2

Tier 1 Tier 1 Tier 2

Tier 3 Tier 3 Tier 3

Spat

ial R

eso

luti

on

(D

)

Temporal Resolution (T)


Media Aware Networking - Virtual Router

Intelligence

The priority of a block calculated by the virtual router is

P = t * T + q * Q

t: weight of temporal aspect

q: weight for quality aspect

T: block temporal priority

Q: block quality priority


Simulation Setup

Typical peer-assisted video-on-demand system

100 Peers with 8 seeders (2 per subnetwork)

SVC video with 8 layers

Scenario 1

10 minute bandwidth bottleneck of the virtual router (3000 kbps)

Router configuration

T100, T70/Q30, T50/Q50, T30/Q70, Q100

Compared to a media agnostic router (random packet drop)

Scenario 2:

10 minute bandwidth bottleneck of the virtual router (3000 & 4000 kbps)

Different quality adaptation intervals: 5, 10, 20, 30, 45 seconds

Router configuration

T100 compared to media agnostic router (random packet drop)


Evaluation Metrics

Perceived Quality of Service

Session Quality

Startup time and number and duration of playback stalls

The shorter and fewer are the stalls, the better is the session quality

Video Quality

Number of quality changers

Constant received level Better user experience

Received quality level (compared to the maximal level)

Higher quality level Better user experience


Simulation Results – Scenario 1

Session Quality

45% smoother playback during

bottelnecks



Video Quality

20% less quality swtiches during

bottelnecks



Session Quality Video Quality

More predictable impact of quality

adaptation


Conclusion

Media-awareness achieves better perceived QoS without any

additional traffic costs

Evolution of internet applications

Media-aware networking will become a must to better handle the enormous

amount of video traffic.

Future Work

Integrate the algorithms into a real virtual router

Perform prototpye evaluation

Develop more sophisticated prioritization algorithms

Build more advanced control and management mechanisms

Security issues when reporting high priority for many blocks.


Thank you for your attention

Router Virtualization as an Enabler for Future Internet Multimedia … · 2010-11-24 · Streaming...

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