Welcome to the. «DVB-H for TV on Mobiles» Gerard FARIA de SOUZA NEVES Teamcast
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1 Welcome to the «DVB-H for TV on Mobiles» Gerard FARIA de SOUZA NEVES DVB-H Workshop -SET'05 - Sao Paulo - 22 September
2 Technologies fight to serve TV on Mobile But numerous challenges have to be took over! UMTS (MBMS) (MBMS) DAB-T (T-DMB) (T-DMB) GSM (GP) (GP) DVB-T (DVB-H) (DVB-H) CDMA (MediaFLO (MediaFLO) MediaFLO) ISDB-T (SS) (SS) DVB-H Workshop -SET'05 - Sao Paulo - 22 September
3 Digital TV to Handhelds: A challenge of integration Gerard FARIA de SOUZA NEVES (gerard.faria@teamcast.com) DVB-H Workshop -SET'05 - Sao Paulo - 22 September
4 Mobile Phones aggregate lot of features GSM 900 GSM 1800 UMTS 2300 CDMA 800/1900 WiMax (WMAN) WiFi (WLAN) Blue Tooth (WPAN) Wireless Network World Mobile Telecom World Don t t forget THE fashionable option: our elegant BACKPACK to carry battery Terrestrial Broadcast World T-DMB (DAB) DVB-H (DVB) T-SS (ISDB) GPS MP3 Player FM Radio DVB-H Workshop -SET'05 - Sao Paulo - 22 September
5 Digital TV to Handhelds: A challenge to reduce power consumption Gerard FARIA de SOUZA NEVES (gerard.faria@teamcast.com) DVB-H Workshop -SET'05 - Sao Paulo - 22 September
6 But Features need to be Powered! DVB-T Single Antenna Reception GSM Interaction Channel Battery Pack Mediascreen remained a «concept terminal» because battery! DVB-H Workshop -SET'05 - Sao Paulo - 22 September
7 Power is a generic problem for TV on Mobile Power Consumption is also an issue For ISDB-T 6 MHz Channel BW Center Segment for Mobile Physical Layer 432 KHz / 400 kbps Selected solution: to reduce channel bandwidth and bitrate! DVB-H Workshop -SET'05 - Sao Paulo - 22 September
8 Digital TV to Handhelds: A challenge for network planning Gerard FARIA de SOUZA NEVES (gerard.faria@teamcast.com) DVB-H Workshop -SET'05 - Sao Paulo - 22 September
9 Broadcasts to Handhelds differ from broadcasts to fix TV sets Digital TV transmitter PLUS Outdoor To Indoor Penetration Loss: 8 db FOR FIX But for NOMADIC RECEPTION: RECEPTION: Field Strength Field Strength Is Planned Shall be For given C/N available At 10 meters At 1 meter Above Above Ground. Ground Level PENALTY: 12 db Broadcast to NOMADIC handhelds Terminals: - Ground level penalty = 12 db - Indoor OR (AND) Mobile penalty = 8 db (16 db) DVB-H Workshop -SET'05 - Sao Paulo - 22 September
10 Broadcast to Mobile Handhelds should imply Single Frequency Networks Equalising the Field Strength with Single Frequency Network is THE major advantage of the COFDM broadcasting technologies! DVB-H Workshop -SET'05 - Sao Paulo - 22 September
11 Digital TV to Handhelds: A challenge to cope with Mobile Reception Gerard FARIA de SOUZA NEVES (gerard.faria@teamcast.com) DVB-H Workshop -SET'05 - Sao Paulo - 22 September
12 Mobile Performances : C/N versus Doppler 50,0 db 40,0 db DVB-T vs DVB-H (8K - gi 1/4-16QAM 2/3 - MPE-FEC 3/4) 13,27 Mbps f D = V f rf C cos(φ) FER 5% MFER 5% DVB-T "Rayleigh" 30,0 db 20,0 db Christian Andreas DOPPLER ( ) 1853) 64QAM 2/3 (20 Mbps) DVB-H MPE-FEC GAIN : 2 to 5 db (Pedestrian) DVB-H MPE-FEC GAIN : 5 to 9 db (Mobile) DVB-H H Gain Area Flat Behaviour 10,0 db 0,0 db 0 Hz 1 Hz 10 Hz 100 Hz 1000 Hz 470 MHz UHF Band IV (21) 16QAM 2/3 (13 Mbps) QPSK 1/2 (5 Mbps) 854 MHz UHF Band V (69) 1 km/h 0,4 km/h DVB-T Mobile Penalty 6 to 12 db Until Max Speed 2 km/h 7 km/h 23 km/h 69 km/h 230 km/h 689 km/h TU6 1 km/h DVB-H Workshop 4 km/h -SET'05-13 Sao km/h Paulo - 22 September 38 km/h km/h 379 km/h 12
13 Digital TV to Handhelds: All competing technologies are using COFDM transmission WHY? Gerard FARIA de SOUZA NEVES DVB-H Workshop -SET'05 - Sao Paulo - 22 September
14 DIGITAL TERRESTRIAL BROADCAST DAB / DVB-H H / ISDB-T T / MediaFLO make use of Coded Orthogonal Frequency Division Multiplex (COFDM) modulation... Distant transmitter Nearest transmitter COFDM is the alone transmission system embedding features to cope with Terrestrial Multi-pathes DVB-H Workshop propagation -SET'05 - Sao Paulo - 22 AND September 2005 Mobile Doppler effects 14
15 COFDM Transmission: How does it work? 1 Time-Frequency cells / Orthogonal carriers / Guard Interval DAB DVB ISDB FLO Orthogonal Carrier Spacing OFDM symbol 1,5 MHz 2K 1K 5/6/7/8 MHz 8K 4K 2K 6/7/8 MHz 8K 4K 2K 6 MHZ 4K Guard Interval Useful Period Time 2K 4K 8K Offers the SAME Bitrate range! frequency frequency frequency Guard Interval is this necessary evil which consumes transmission capacities, respectively 25%, 12.5%, 6.25%, 3.12% for GI= 1/4, 1/8, 1/16, 1/32 DVB-H Workshop -SET'05 - Sao Paulo - 22 September
16 COFDM Transmission: How does it work? 2.1 (DAB / T-DMB) T Time Domain Synchronisation [no channel estimation as Differential QPSK modulation] Frame duration Null FFT symbol window Synchronization symbol (TFPR) time frequency FFT time windows for receivers DVB-H Workshop -SET'05 - Sao Paulo - 22 September
17 COFDM Transmission: How does it work? 2.2 (Others) Time & Frequency Domains Synchronisation + Channel Estimation OFDM symbol FFT window Guard Interval Useful Period Time frequency frequency frequency Pilots & TPS consume transmission capacities (8% & 1%), But Pilots are needed to perform channel error estimation! DVB-H Workshop -SET'05 - Sao Paulo - 22 September
18 COFDM Transmission: How does it work? 3.1 (DAB/T-DMB) DMB) Channel Coding to Protect Data [ISDB-T T & MediaFLO also uses Time-Interleaved Logical Sub-Channels] DATA to broadcast (up to 1.5 Mbps) Inner FEC coding and Inter-frame Time Interleave [*] (up to 2.3 Mbps) time frequency [*] Frame is divided in sub-channels (i.e. set of adjacent OFDM symbols) And FEC is applied individually per sub-channel as the time interleave among 16 successive frames DVB-H Workshop -SET'05 - Sao Paulo - 22 September
19 COFDM Transmission: How does it work? 3.2 (Others) Channel Coding to Protect Data Data to Broadcast Concatenated (Outer & Inner) FECs + Interleavers (Bytes & Bits) Time frequency frequency frequency Protection coding consumes bitrate but allows to reconstruct lost t data! Respectively 50%, 33%, 17%, 13% for 1/2, 2/3, 3/4, 5/6, 7/8 DVB-H Workshop -SET'05 - Sao Paulo - 22 September
20 Digital TV to Handhelds: DVB-H H is THE future proof solution! Gerard FARIA de SOUZA NEVES (gerard.faria@teamcast.com) DVB-H Workshop -SET'05 - Sao Paulo - 22 September
21 DVB-H H targets Handheld Battery Powered Terminals HTHT HTHT H DVB-H Workshop -SET'05 - Sao Paulo - 22 September Every Time, Every Where (Nomadic) On the Move (Mobile) AT HOME (Fix)
22 With the introduction of TV on Mobile, some Protocol Stacks evolve to convergence! MULTIMEDIA CONTENTS MediaFlo Multimedia Services ISDB-T Digital TV Services ISDB-T Multimedia Services DAB Digital RADIO Services T-DMB Multimedia Services CBMS: Service Convergence IPDC: Transport Convergence IP MAC LAYER IP Digital TV Services DVB frame TS TS circuit TS packet TS TS FLO PL ISDB-T Physical Layer T-DAB Physical Layer PHYSICAL LAYER DVB-T Physical Layer DVB-H Workshop -SET'05 - Sao Paulo - 22 September
23 DVB-H a collection of enabler technical features Time Time Slicing Slicing Time Slicing: : a transmission method to allow battery saving in receivers, FEC FEC (Reed (Reed Solomon) Solomon) MPE-FEC: FEC: : an additional protection at the DATA link layer level, 4K 4K fft fft (8K, (8K, 2K) 2K) Enhanced Enhanced TPS TPS signaling signaling 4K: : a new trade-off (coverage vs speed) for network planning flexibility, TPS : signalling data in the channel to speed-up DVB-H H services discovery, In-depth interleaver: : a free feature to improve impulse noise resilience for 2K & 4K transmissions. DVB-H Workshop -SET'05 - Sao Paulo - 22 September
24 DVB-H MPE-FEC protection with virtual TI 192 columns (bytes) 64 columns (bytes) IP Header IP Datagram 1 IP Header IP Datagram 2 IP Header IP Datagram 3 IP Datagram 3 IP Header IP Datagram 4 Application Frame Header Padding IP Header IP Datagram n PADDING Padding (=00) code word on Row 0 code word on Row 1 column 1 column 2 Etc FEC Frame Etc Etc Etc column n-1 n column n PUNCTUNRING code word on Row n-1n code word on Row n FEC FEC section section n-1 n-1 FEC FEC section section FEC FEC section section 2 FEC FEC section section 1 MPE MPE section section N MPE MPE section section 3 MPE MPE section section 2 MPE MPE section section 1 To TS packet slicer DVB-H Workshop -SET'05 - Sao Paulo - 22 September
25 DVB-H H data at IP level DVB-H Time Slicing for Battery saving IP datagrams of Service 3 IP datagrams of Service 2 IP datagrams of Service 1 DVB-H H data in MPE sections Service 1 IP in Section Service 2 IP in Section Service 3 IP in Section Service 1 IP in Section Service 2 IP in Section Service 3 IP in Section DVB-H H MPE-data sections in TS Service 1 Section in TS Service 2 Section in TS Service 3 Section in TS Service 1 Section in TS Service 2 Section in TS Service 3 Section in TS TS onto OFDM Time frequency frequency frequency Time-Sliced Burst Service 2 Time-Sliced Burst Service 2 DVB-H Workshop -SET'05 - Sao Paulo - 22 September
26 DVB-H Globally Helps Receivers & Networks! Power Consumption & Handover Power Consumption Reduction up to 90% Requires a 2 Mbits buffer Seamless Handover possible during off time DVB-H Demodulator IP TS Time Slicing MPE Power Control MPE FEC 8k DVB-T Demodulator ETS k 2k DVB-H H TPS RF (Receiver) C/N Performance for additional service robustness Virtual time interleaver Doppler & C/N improvements Impulse Noise interference tolerance Variable levels of robustness Network Design Flexibility & Signalling Very low additional complexity Doppler resilience improvment SFNs possible (4K equals twice 2K) Additional robust DVB-H H signalling DVB-H Workshop -SET'05 - Sao Paulo - 22 September
27 validated within the DVB-H H Validation Task Force October 2004: December 2004: Laboratory Tests in T-Systems T (Berlin) Field Trials in Telediffusion de France (Metz) May 2005: VTF report published by ETSI as TR Gerard FARIA de SOUZA NEVES (gerard.faria@teamcast.com) DVB-H Workshop -SET'05 - Sao Paulo - 22 September
28 Digital TV to Handhelds: A challenge to access Spectrum Gerard FARIA de SOUZA NEVES (gerard.faria@teamcast.com) DVB-H Workshop -SET'05 - Sao Paulo - 22 September
29 km/h MACH ONE MACH ONE km/h 100 km/h 10 km/h URBAN HIGHWAY TRAIN AIRCRAFT Band III COFDM can perform wonderfully in any RF Band and any Signal Bandwidth! DVB-H versus T-DMB (Max RF bands) Band IV HTHT Band V DAB III (192, ICS: 8 KHz) 2K, gi: 1/4, QPSK, cr: 1/2, 4,98 Mbps 2K, gi: 1/4, 16QAM, cr: 2/3, 13,27 Mbps DAB II (384, ICS: 4 KHz) 4K, gi: 1/4, QPSK, cr: 1/2, 4,98 Mbps 4K, gi: 1/4, 16QAM, cr: 2/3, 13,27 Mbps DAB VI (768, ICS: 2 KHz) 8K, gi: 1/4, QPSK, cr: 1/2, 4,98 Mbps 8K, gi: 1/4, 16QAM, cr: 2/3, 13,27 Mbps DAB I (1536, ICS: 1KHz) 100 MHz MHz MHz L-Band Figures from the Typical Typical DVB-H H Reference Receiver (Existing Enhanced Receiver runs at 30% higher speeds!) DVB-H Workshop -SET'05 - Sao Paulo - 22 September
30 The DVB-H H Mobile Performance Evaluation Mobile Performance Evaluator Select Channel Parameters RF Channel Bandwidth 8 MHz Segmented Bandwidth (only 1/1 1/1 standardised) Select Transmission Mode Transmission Mode 8K Elementary Period (T) 7/64 ( 109,38 ns ) ( 9,14 MHz ) RF signal Bandwidth 7,61 MHz ( Hz ) Total Symbol µs (Ts=Tu+Tg) Useful Symbol Part 896 µs (Tu) Guard Interval 224 µs (Tg) Max Differential Path 67 km (SFN TX distance) Inter Carrier Spacing 1,1 KHz ( Hz ) 50,0 db 40,0 db 30,0 db 20,0 db 10,0 db frf f D = V cos(φ) C 14,2 db DVB-T / DVB-H Mobile Performance (C/N versus Doppler) 79 Hz; 26,4 db 106 Hz; 19,6 db Rayleigh DVB-T DVB-H Guard Interval 1/4 Select Modulation DVB-T Bitrate 13,3 Mbps ( 13,271 Mbps ) DVB-T Spectrum Efficiency 1,74 b/s/hz DVB-H Bitrate 10,0 Mbps ( 9,953 Mbps ) DVB-H Spectrum Efficiency 1,31 b/s/hz TU km/h 10 Hz 100 Hz 1000 Hz Hz DVB-T / DVB-H Mobile Perfomance (Max Speed versus RF band) frf f D = V cos(φ) C DVB-T DVB-H Constellation Code Rate (available as DVB-H DVB-H H calculator on 16 QAM 2/3 QEF 14,2 db (DVB-T in Rayleigh) Mobile Penalty -9,2 db * FER 5% 23,4 db * (DVB-T in TU6) MPE-FEC Gain +6,8 db * MFER 5% 16,6 db * (DVB-H in TU6) km/h 174 MHz; 651 km/h 174 MHz; 731 km/h 470 MHz; 241 km/h 862 MHz; 131 km/h 470 MHz; 271 km/h MHz; 78 km/h 862 MHz; 148 km/h MHz; 47 km/h MHz; 88 km/h MHz; 53 km/h MHz; 29 km/h MHz; 33 km/h Select DVB-H Protection DVB-T Max Doppler 105 Hz * ( 105,01 Hz ) MPE-FEC Code Rate 3/4 MPE-FEC Gain +13 Hz * 10 km/h III IV V L S DVB-H Max Doppler 118 Hz * ( 117,91 Hz ) TU6 100 MHz MHz MHz DATA in Italic are extrapolated from other measurements. Copyright TeamCast 2005 TeamCast & DiBcom decline all responsabilities resulting from the usage of the indications provided by this Copyright DiBcom km/h DVB-H Workshop -SET'05 - Sao Paulo - 22 September MACH1 URBAN HIGHWAY TRAIN AIRCRAFT
31 Sorry, but I can t t honestly find another conclusion DVB-H Workshop -SET'05 - Sao Paulo - 22 September
32 Espace Performance F35769 SAINT GREGOIRE (FRANCE) gerard.faria@teamcast.com Paris Rennes Thank You for Your Attention DVB-H Workshop -SET'05 - Sao Paulo - 22 September
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