video over ip goes wireless: a dvb-h tutorial
DESCRIPTION
A technical description on how to show video over wireless devices. A short description of the challenges such as power consumption, Doppler effect and the many encapsulation protocolsTRANSCRIPT
Marie Josée Drouin, VSF Meeting, June 06
© D. Tech 06
Video over IP
goes Wireless
A DVB-H Tutorial
© D. Tech 062010/02/24 - 3
Agenda
1. Video over Mobiles
2. DVB-H Technical Review
3. System Technical Review
4. Video Services on Mobile
© D. Tech 062010/02/24 - 4
Introduction
Missing Service on Mobile Phones:
VIDEO
Mobile users are ready to pay for it
Source: IPDC Forum/HPI Research (2003) & DigiTag DVB Handbook
Marie Josée Drouin, VSF Meeting, June 06
© D. Tech 06
Video Over Mobiles
© D. Tech 062010/02/24 - 6
Mobile: What’s different?
Traditional DTV Display
Uses wireline or large antennas
Has unlimited 110V/220V power
Is fixed
Methods for Video on Mobiles
Internet services
Java-based applications
2.5/3G cell technology
Parallel broadcast networks
© D. Tech 062010/02/24 - 7
Video over Mobile Standards
Standards Origin Technology Dates
T-DMB DAB (ETSI) 1,7 MHz T: ?
Korea & Int. ~1 Mbps D: Dec 05
DVB-H DVB (ETSI) 5,6,8 MHz T: Apr 04
International ~11 Mbps D: Mar 06
Single-segment
ISDB-TDiBEG (ARIB) 1/13th of 6 MHz T: Oct 04
Japan ~1 Mbps D: Mar 06
MediaFLO Qualcomm (TIA) 6 MHz T: Summer 06
US ~11 Mbps D: Q4 06
Legend: T: Public Trial, D: Commercial Deployment
© D. Tech 062010/02/24 - 8
What is DVB-H?
Built by DVB
Standardized by ETSI
Unidirectional
Based on DVB-T, used for terrestrial transport of Digital TV
Using IP packets at the Network Layer
Can be muxed with DVB-T CBR services
© D. Tech 062010/02/24 - 9
DVB-H Adoption Worldwide
Source: DVB-H website
Marie Josée Drouin, VSF Meeting, June 06
© D. Tech 06
DVB-H Technical Review
© D. Tech 062010/02/24 - 11
DVB-T OSI Layer 1
3
2
1DVB-T
Source: ETSI TR 102 377 v1.2.1 (2005-11)
© D. Tech 062010/02/24 - 12
DVB-T Modifications (L1)
DVB-H signaling in
TPS-Bits: Mandatory
Time Slicing, MPE-FEC, Interleaver
depth, Cell ID, and 4K mode
4K FFT size mode: Optional
In-depth symbol interleaver: Optional
8K interleaver for 2k and 4k modes
© D. Tech 062010/02/24 - 13
DVB-H Protocol Stack & OSI L2
DVB-H
3
2
1DVB-T
Source: ETSI TR 102 377 v1.2.1 (2005-11)
© D. Tech 062010/02/24 - 14
DVB-H Innovations (L2)
Time-slicing: Mandatory
Power reduction
MPE-FEC: Optional
C/N
Doppler
Impulse interference
© D. Tech 062010/02/24 - 15
DVB-H System
* Inspired by ETSI TR 102 377 v1.2.1 (2005-11)
IP Backbone
Video
IPMPEG4
Encoder
NIT
Video
DVB-H Receiver
IRD
DVB-T Receiver
PSI/SI
RF
RF
INTTS
RF
MPEG4
EncoderMPEG4
Encoder
© D. Tech 062010/02/24 - 16
Solving the Layer 1&2 Issues
Mobility:
Doppler 4K FFT size
Power consumption:
Time Slicing
© D. Tech 062010/02/24 - 17
Doppler Effect (L1)
Source: ETSI TR 102 377 v1.2.1 (2005-11)
© D. Tech 062010/02/24 - 18
FFT Size Impacts (L1)
FFT size Impacts on RF performance Doppler Frequency – Mobility Echo delay – Maximum SFN radius area Channel estimation – Demodulator complexity & power Phase noise resistance – Robustness
Source: ETSI TR 102 377 v1.2.1 (2005-11) & ETSI EN 300 744 V.1.5.1 (2004-11)
OFDM parameters, 16QAM, GI 1/4, 6MHz
FFT symbol size characteristics 2K 4K 8K
Number of Carriers (K) 1705 3409 6817
Duration of symbol - Tu (µsec) 299 597 1195
Carrier Spacing - 1/Tu (Hz) 3348 1674 837
Duration of guard interval - Δ (µsec) 75 149 299
Modes, FFT size
© D. Tech 062010/02/24 - 19
Power Consumption
Source: ETSI TR 102 377 v1.2.1 (2005-11)
© D. Tech 062010/02/24 - 20
Time-Slicing (L2)
Source: ETSI TR 102 377 v1.2.1 (2005-11)
MPE Sections
© D. Tech 062010/02/24 - 21
Solving the Layer 2&3 Issues
Multi Protocol Encapsulation
with FEC (MPE-FEC)
IP Datagrams
© D. Tech 062010/02/24 - 22
Multi Protocol Encapsulation (L2)
Source: ETSI TR 102 377 v1.2.1 (2005-11)
© D. Tech 062010/02/24 - 23
IP (L3) -> MPE-FEC (L2)
Source: ETSI TR 102 377 v1.2.1 (2005-11)
Marie Josée Drouin, VSF Meeting, June 06
© D. Tech 06
System Technical Review
© D. Tech 062010/02/24 - 25
Solving the Layer 3&4 Issues
IP DataCasting (IPDC)
Convergence of Broadcast and Mobile
Services (DVB-CBMS)
© D. Tech 062010/02/24 - 26
IPDC OSI Layer 3
DV
B-H
3
2
1
IPDC
DVB-T
Source: ETSI TR 102 377 v1.2.1 (2005-11)
© D. Tech 062010/02/24 - 27
IPDC Protocol Stack (L3&4)
Source: ETSI TS 102 472 V1.1.1 (2006-06)
© D. Tech 062010/02/24 - 28
IPDC Protocol Stack (L3&4)
Source: ETSI TS 102 469 V1.1.1 (2006-06)
© D. Tech 062010/02/24 - 29
Putting it together: DVB-CBMS
Source: ETSI TR 102 469 v1.1.1 (2006-5)
© D. Tech 062010/02/24 - 30
System Summary
DVB-SFNTS 101 191
DVB-ESGTS 102 471
DVB-HEN 302 304
TR 102 377
DVB-CBMSTR 102 469
DVB-TEN 300 744
TR 101 190
DVB-CDPTS 102 472
DVB-SPPTS 102 474
DVB-DataEN 301 192
TR 101 202
DVB-SIEN 300 468
TS 102 470
Mobile
Video
Marie Josée Drouin, VSF Meeting, June 06
© D. Tech 06
Video Services on
Mobiles
© D. Tech 062010/02/24 - 32
DVB-H Services
Hierarchical
offerings
Parallel Services
Typical
configuration
© D. Tech 062010/02/24 - 33
Hierarchical Services (L1)
Source: Hierarchical modulation — the transmission of two independent DVB-T multiplexes on a single frequency by
Alexander Schertz and Chris Weck (2003)
© D. Tech 062010/02/24 - 34
Parallel services (L2)
Source: ETSI TR 102 377 v1.2.1 (2005-11)
© D. Tech 062010/02/24 - 35
Typical Configuration
Code-rate:
½ (9,95Mbps*)
2/3 (13,27Mbps*)
FFT size: 4K
GI = ¼ or 112 µsec
16-QAM
* for 6MHz channel
© D. Tech 062010/02/24 - 36
DVB-H in North-America
Modeo: Formerly known as Crown Castle Mobile Media,
Announced in Jan 06 for this year roll-out of DVB-H services in top 30 markets in USA,
Testing DVB-H in Pittsburgh since June 04.
LookTV Mobile high-speed and high-traffic environment,
Testing DVB-H with 2 transmitters in Milton, Ontario,
Since Jan 2006.
HiWire Subsidiary of Aloha Partners,
Will launch mobile TV trial in autumn 06,
Aloha owns 12MHz / 700 MHz spectrum across US,
Partnered with SES Americom,
Testing DVB-H in Las Vegas since Jan 06.
Source: DVB-H and Mobile TV Alliance Web sites
© D. Tech 062010/02/24 - 37
Conclusion: DVB-H
Fully Standardized End-to-End Service
Backward Compatible
Developed new Features for Mobiles
IP Based Service
Services are tested and rolled-out all
over the World & North-America
-> WATCH OUT !
© D. Tech 062010/02/24 - 38
References
www.ipdc-forum.org
www.dvb-h.org
www.etsi.org
http://www.rfc-editor.org
www.mdtvalliance.org
© D. Tech 062010/02/24 - 39
Main Documents
ETSI TR 102 377 V1.2.1 (2005-11)
Digital Video Broadcasting (DVB);DVB-H Implementation Guidelines
DVB Bluebook A101 (2005-12)
IP Datacast over DVB-H: Content Delivery Protocols (CDP)
ETSI TR 102 469 V1.1.1 (2006-05)
Digital Video Broadcasting (DVB); IP Datacast over DVB-H: Architecture
