powerpoint presentation presentation author: amal created date: 8/6/2015 1:45:17 am
TRANSCRIPT
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Dr AMAL Punchihewa Director ABU Technology
Asia-Pacific Broadcasting Union A Vice-Chair of World Broadcasting Union – Technical Committee (WBU-TC)
Distinguished Lecturer of IEEE Broadcast Technology Society
Delivery Technologies and Business Models for Mobile Television Services
2015
Bangkok, Thailand
Dr Amal Punchihewa © Distinguished Lecturer of IEEE Broadcast Technology Society
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Session 2: Introduction on MTV standards
Dr Amal Punchihewa
Dr Amal Punchihewa © Distinguished Lecturer of IEEE Broadcast Technology Society
PhD, MEEng, BSC(Eng)Hons, CEng, FIET, FIPENZ, SMIEEE, MSLAAS, MCS Postgraduate Studies in Business Administration
Director ABU Technology Asia-Pacific Broadcasting Union, Kuala Lumpur, Malaysia
A Vice-Chair of World Broadcasting Union – Technical Committee (WBU-TC) Distinguished Lecturer of IEEE Broadcast Technology Society
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Aim To provide insight into the network architecture and functionality of the different MTV technologies
• T-DMB
• ISDB-T (OneSeg/mm)
• DVB-T2 Lite
• Wi-Fi offload
• Hybrid MB - Tower Overlay over LTE-A+
• Application in different countries - Japan, Korea, Europe….
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How to deliver content ? • Over-the-air ( OTA) – most efficient
• Over-the-cable (OTC) – most secured
• Over-the-broadband or Over-the-top (OTT) – growing form of delivery
• How to access content?
– Free-to-access
– Pay-to-access
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Casting – Information delivery • Unicast is the term used to describe communication
where a piece of information is sent from one point to another point. In this case there is just one sender, and one receiver.
• Multicast is the term used to describe communication where a piece of information is sent from one point to a set of other points.
• Broadcast is the term used to describe communication where a piece of information is sent from one point to all other points. In this case there is just one sender, but the information is sent to all receivers.
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Network Architecture • Internet - network of networks - enables P2P
Communication
• Mobile/Cellular are networks - enables P2P Communication via BS (Base Station)
• Both above networks are not designed for broadcasting
• Mobile/Cellular networks - for unicasting • Internet – for unicasting and multicasting • Broadcasting NWs has been designed to broadcast –
Radio, Television and Data Broadcasting (NWs are broadcast networks by design) – Architecture is high tower high power (in general)
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Digital Broadcasting Transmission Technologies
• DVB • ISDB • ATSC • DTMB
• Delivery
– Terrestrial – Satellite – Cable – Virtual pipe - IP
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• DAB • DAB+ • T-DMB
• Delivery
– Terrestrial – Satellite
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Media/TV consumption to be served • Stationary vs. Mobile • Linear vs. Nonlinear
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Linear Nonlinear
Sta
tiona
ry
Mob
ile
Source: Dr Amal Punchihewa © MMRG
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MTV - Mobile Television Services • T-DMB - 2005
• ISDB-Tmm - April 2012
• ATSC-M -
• DVB-T2 Lite
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DVB-T 1997, DVB-H 2004, T-DMB 2005, DVB-T2 in 2008, DVB-T2 Lite
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Video standard extension of Digital Audio Broadcasting (DAB) • Fully compatible with Eureka-147 • Provides video and data services as well as CD-quality audio service
What is T-DMB ?
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Commenced around May 2005
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T-DMB Service Features
TTI : Traffic and Travel Information, PPV: Pay Per View
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Eureka 147 Specifications
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T-DMB
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T-DMB Frequency Allocation
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T-DMB Services
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T-DMB Devices
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ISDB-Tmm - Services Services • Real-time service • Download service
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Technical Features of ISDB-Tmm
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Technical Specifications of ISDB-Tmm
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ISDB-Tmm Protocol Stack
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Tuner Hardware • Advances in chip design…
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Source: http://jp.fujitsu.com/
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ATSC-M
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OSI reference model with ATSC-M/H components
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ATSC Protocol stack
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ATSC-M Transmission
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DTV-T
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Broadcasting to Mobile - NGH
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DVB-T2 Lite
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T2 Transmission Parameters
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DVB-T2 Lite specifications • A maximum bitrate of 4 Mbits/sec for each service • Limitations on the FFT size to exclude the 1K and 32K carrier
modes • Prohibition of the use of rotated constellations in 256-QAM • Possibility for only short FEC frames (Nldpc = 16200) • Limitation of the size of the time interleaver memory
(approximately half the size of normal DVB-T2). • two new LDPC error control code rates, 1/3 and 2/5, more
options for mobile reception • Through use of FEF allowing different FFT size and Guard
interval in transmissions • T2 lite signal ignored by normal DVB-T2 receiver
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Mobile reception • The commercial focus on DVB-T2 is primarily on
stationary reception (beyond SDTV), but DVB-T2 is also designed to work well in mobile/handheld conditions – deep time interleaving
– supports power saving by time slicing
– enables the introduction of “T2-Lite” or DVB-NGH services via Future Extension Frames (FEF)
– T2-Lite is part of the DVB-T2 standard (from v.1.3.1)
– DVB-NGH is based on DVB-T2
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Reduced complexity leads to smaller silicon size (-50%) and lower power consumption
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Wide range of bitrate vs. robustness • Space division multiplexing
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Multiple PLPs • Possibility to prioritize robustness
for selected “high-priority” services - prioritized services (e.g. public service) will “serve longer” in bad reception conditions
• Capacity and coverage can be further improved by Time Frequency Slicing (TFS), which uses multiple PLPs – Each PLP is frequency hopping over
several RF channels increased frequency diversity
• Limitation different FFT size not allowed
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Multiple PLPs • Possibility to reach different
kinds of receivers and reception conditions with a single RF signal – HDTV to roof-top directional
antennas in PLPs with ”normal” robustness PLPs
– Mobile receivers with robust PLPs
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PLP for various services Power saving
PLP
Time slicing Mobile robustness
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Future Extension Frames (FEF)
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Future Extension Frames (FEFs) • A mechanism that allows a future system to be sent as
“Future Extension frames” in T2 time slots – No restrictions in the allowed content of the FEF – FEF may use DVB-T2 Lite (mobile, specified subset of DVB-T2) – Future transmission of the DVB Next Generation Handheld (DVB-
NGH) standard currently developed by DVB
• The FEF mechanism does not exist in DVB-T • Allows flexible capacity allocation to fixed and mobile
services by adjusting the size of T2 frame and FEF
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Future Broadcasting NGB • Countries starting digital should consider DVB-T2
– “no point” to start DVB-T today
• Multiple PLP:s- common infra structure for Radio and TV?
• DVB-T2 with 1.7 MHz BW to replace T-DAB
• Chinese Digital TV system standard DTMB will present a new DTMB-A , which is a similar to DVB-T2- but probably has a few years to implementation
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Classification of Media Delivery
Copyright Reserved Adapted from ITU © Amal
Dr Amal Punchihewa © Distinguished Lecturer of IEEE Broadcast Technology Society
gies an d Standards (Semi
interactive) traditional broadcast networks
( Interactive) integrated networks
(Fully interactive)
duplex networks
Video service with managed QoS Video service with unmanaged QoS
DTTB/Sat
Linear TV
DTTB
Linear VoD
Internet
Internet IPTV/HFC 3/4G
6 Linear VoD
Internet
Linear VoD Linear VoD Linear VoD
4 7 5
Linear VoD
MTV
Traditional 1
2
3/4G
3
Wireless OTT IPTV
OTT - wireless
OTT
Internet TV
Wired IBB
Wireless IBB
OTT
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• T-DMB, ISDB-Tmm, ATSC-M and DVB-T2 lite
• Efficient and effective broadcasting to mobile devices is possible
• ster innovation in Hybrid broadcasting
To summarise
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