WebRTC in a real Mobile Scenario

Dr. Joachim Stegmann, Telekom Innovation Laboratories

WebRTC in a real Mobile Scenario

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01 Introduction

02 Unlocking new services with WebRTC

03 WebRTC based services: What about quality?

04 Audio quality tests

05 Conclusion

WebRTC in a real Mobile Scenario

INTRODUCTION

WebRTC provides a lot of benefits to simplify communication outstanding HD user experience in desktop use @home, @office on any device with a browser that is supported

Trend is more traffic on mobile than desktop.

Need to use WebRTC in mobile environments is growing significantly In private and corporate communication: everywhere, easier and cheaper e.g. in Customer Service: Unlocking new service ideas (video support, video chat substitutes in-person interaction)

In OTT to support the change from circuit-switched call to IP/WebRTC

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Thanks to stable steady

conditions!

What about outside the

ideal world?

Challenges emerge from the mobile environment’s instability: Changes in connectivity and network load, interferences etc.

UNLOCKING NEW SERVICES WITH WebRTC

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Connecting TELCOs AND WEB

Managed OTTCore network + cloud servicesOptimized cost structure

Disruptive services

ENTERPRISE COMMUNICATION

Customer service +++ Sales & support +++ Pricing & license models +++ M2M +++ Industry 4.0 +++ Content delivery networks

Efficiency and cost savings

Makes collaboration easier, cheaper and more flexible!

Extend Telekom core offerings e.g. VoLTE

WebRTC Conferencing

http://www.immmr.com

UNLOCKING NEW SERVICES WITH WebRTCTypical Use case IN Customer Service

REMOTE VIDEO HELP

Initiates video stream from customer’s smartphone (back cam) to agent’s desktop

Live-video or single shot alternatively

Allows drawing markers by mouse pointer

Requires no installation on the agent or customer side

– pure browser-based solution (WebRTC)

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UNLOCKING NEW SERVICES WITH WebRTCENTERPRISE COMMUNICATION

WEBRTC CONFERENCING

Browser-based video call conferencing

Access from PSTN to allow participation in web-conference

Text chat

Desktop share

Whiteboard functionality with import / export

File exchange, sending files via drag & drop

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…immmr…

Immmr – A Managed ott operator

Virtualized primary number

Make / receive calls on any device

WebRTC, Wi-Fi Calling

/ GSM fallback

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WebRTC provides excellent audio quality under ideal, steady state conditions.

What is the situation under mobile conditions?

How strong is the impact of fluctuating field strength, network transitions etc.?

WebRTC based Services – What about Quality?

Audio Quality TestsTest Location And Routes

MOBILITY TESTCASES (2 hours per test case)

performed on a pre-defined route in Duesseldorf that contains many handoversand RAT changes

STATIONARY TESTING (20 min. per test case)

performed in P3 Communications Aachen office (Telekom indoor coverageinfrastructure) in static coverage condition depending on the required technology

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Evaluating voice quality of NG networks

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Perceptual Objective Listening Quality Analysis

Global standard for benchmarking voice quality of fixed, mobile and IP-based networks

Applied for classical band-limited telephony VoIP, HD Voice, 3G and 4G/VoLTE networks

© OPTICOM GmbH 2010

POLQA is suited to evaluate and monitor voice quality of NG networks.

Su

per

-wid

e-b

and

(SW

B)

14kH

z

The different bandwidths are mapped on the MOS scale 1 - 5.

WebRTC under stationary conditionS

On-net Off-net (Landline) Off-net (Mobile)

WebRTC (Wi-Fi, Opus, 40kbps) MOS 4,1 MOS 2,9 MOS 2,9

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REFERENCE

WebRTC on-net calls show significantly better audio quality than circuit-switched (CS) HD audio calls.

WebRTC off-net calls to PSTN (landline and mobile) show audio quality as good as narrow-band CS calls.

Influence of transcoding seems to be negligible.

AMR wide-band (HD voice) AMR narrow-band

Circuit-switched MOS 3,8 MOS 2,8

COMPARISON of WebRTC VS. CS Calls on Mobility

WebRTC on-net calls with

better audio quality than CS calls.

HD audio, once switched off for transition from 4G/3G to 2G, will never be

switched on again during a CS call.

WebRTC calls benefit from higher data rates in 3G/4G

after coming back from 2G.

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4

4

4

WebRTC1

WebRTC2

CS

MOS

„No audio transmitting“ cases are often caused by bearer changes between 4G/3G

COMPARISON of WebRTC VS. CS Calls on Mobility

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4

4

4

Significant problems of

WebRTC with bearer changes between 2G/3G/4G

WebRTC1

WebRTC2

CS

MOS

ConSideration of used Bitrates for WebRTC

Higher bitrates for WebRTC

result in better audio quality by decreasing stability.

Bitrate of 12 kbps shows already sufficient audio quality.

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4

4

4

MOS

WebRTC1

12 kbps

WebRTC1

20 kbps

WebRTC1

40 kbps

WebRTC in a real Mobile ScenarioConclusions

PREDICTING NETWORK CONDITONS

To avoid instabilities by high bitrates and bearer changes try to predict the network conditions to be expected

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ADAPTING BITRATES

Under mobile condition already 12 kbps with good audio quality and better stability

4G and 40 kbps in case of stationary conditions

HANDLING BEARER CHANGES

Issues observed for bearer changes between 2G, 3G and 4G under mobile condition.

Optimization of bearer changes handling on WebRTC platform side is elementary!

WebRTC on-net calls offer outstanding quality under stationary conditions. In mobile use possible instabilities caused by changing conditions can be minimized considering the influence quantities.

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WE SHAPE THE FUTURE

Telekom Innovation Laboratories