dvb-sh esa workshop2008 preso · 2020. 7. 19. · march 2008 : “dvb-sh implementation guidelines...

Nghia PHAM ESA WORKSHOP – Ground Segment Technology, Nordwijk, 5/6 June 2008

DVB-SH … among others

AgendaTerminology

Background on DVB-SH

Highlights of Technical features

Conclusions

Nghia PHAM, [email protected]


TERMINOLOGY

What is Mobile TV ?� A system of TV and infos delivery that adapts itself to your receive

environment and timing constraints;

� A system that let you select content, choose format, pause, forward, “start from the beginning”, fast forward, in the best way depending on where you are.

What is a standard ?

� A set of specifications produced by a representative committee with a clear rule for timely initiating the process and concluding it in a consensus-building manner.

What is an open standard ?

� A standard that is royalty-free (or practically so!)

� A standard that is not controlled by a dominant player and is maintained by a representative committee in a participative way.

DVB Satellite to Handheld DVB Satellite to Handheld

Special thanks to the following companies:


DVB-SH is about…

� Delivering IP-based media content to handheld and vehicular terminals at frequencies below 3 GHz

� (Unlike any other terrestrial-based solutions)

� providing nationwide coverage

� using harmonised frequencies assigned to Satellite for complementary coverage by terrestrial gapfillers

� Leveraging DVB-H “ecosystem” for joint deploymentMADE IN D

VB

MADE IN D

VB

MADE IN D

VB

MADE IN D

VB


BACKGROUND

� Hybrid broadcast already in use : SDARS (US), S-DMB (South Korea & Japan). Together these proprietary satellite systems served >13 Mi users (2006).

� 100…150+ Mi is the estimated number of MobileTV users in the 2010 horizon (e.g. Northern Sky Research, “Enabling Rich Video On the Go”, Feb. 2006)

� June 2006: TM-SSP (Satellite Systems for Portable devices) created, at the initiative of Alcatel with backing from Eutelsat, SES-Astra and others.

� Oct 2006 : Eutelsat & SES-Astra announced the creation of SOLARIS.� S-band GEO satellite scheduled for Q1/09 launch.

� Feb. 2007: DVB-SH normative texts delivered to ETSI. EC directive designates S-band for satellite priority use.

� Jul. 2007 : ALU tests DVB-SH with SFR (french 3G operator).

� IBC Amsterdam 2007 : DVB-SH products advertised by Dibcom, UDcast, Teamcast, Uniquesys, Enensys, SIDSA, Samsung, Sagem, Archos.

� March 2008 : “DVB-SH Implementation Guidelines V1” delivered to ETSI

� April 2008 : ICO G-1 satellite launched, partner with Delphi for terminals, ALU fornetwork (US market). ETSI approved DVB-SH standards


‘system’ specificationsTS 102585

WaveformDefinition

EN 302583

ImplementationGuidelines

prTS 102584

DVB-SIEN 300468SH Descriptors

Link layer:EN 301192

MPE-iFEC

SH specifications Collateral specification effort

Synchronization

MIP: ETSI EN101191

updates

references

Synchronization

MIP: ETSI EN101191

ModifiesAndIncludes

SH Specifications within DVB framework

CBMS

Mobility IGIPDC for SH


ARCHITECTURE

� Satellite Component (SC) covers mainly rural areas

� Complementary Ground Component (CGC) covers mainly urban areas, including indoor.

� Seamless transitions between - and constructive addition of - signals in overlapping areas, e.g. suburban areas.

� CGC must replicate SC content (“Common Content”). Local content can be offered in addition.

DVB-SH SatelliteDVB-SH Signal

Content

Head-endSatelliteEarthStation

BroadcastDistributionNetwork

PersonalGap-fillers

TerrestrialTransmitters

MobileTransmitters

Distribution signal


Complementary Ground Component

Complementary Ground Component (CGC) consists of terrestrial repeaters (TR). Three types can be distinguished:

TR(a): Leverage existing networks infrastructures (e.g. 3G BS, broadcast towers), especially in urban areas . Local content insertion is possible, relying on frequency planning, hierarchical modulation and/or modulation/coding optimisations.

TR(b): Personal gap-fillers of limited coverage providing mainly on-frequency re-transmission; typical application is helper for indoor usage under satellite-only coverage; no local content insertion.

TR(c): Mobile transmitters creating a “moving complementary infrastructure”. Depending on waveform configuration and radio frequency planning, local content insertion may be possible.


A challenging obligation: maximise spectral efficie ncy

� Available bandwidth is limited (as always).

� How many Mbits can be offered in the satellite coverage and how many Mbits can be offered in the terrestrial coverage?

� To be competitive, a minimum of 20-30 programs (at QVGA resolution) must be offered per country in urban areas and a minimum of 7-10 programs over 100% of territory.

� In Europe, linguistic zones exist. A multi-beam satellite system allows frequency reuse between satellite beams as well as between satellite beams and terrestrial repeaters.


A challenging task: several terminal types & use cases

G/T ~ -21 dB/K

Vehicular

Doppler = 230 Hz

(130Km/h)

G/T ~ [-25,-29] dB/K G/T ~ -32 dB/K

Embedded

antenna

Enhanced

antenna

Handheld

Small antenna(s). Small form factor

Battery conservation

User cooperation may be required

for satellite direct reception

Personal gap-filler

G/T ~ -19dB/K

High gain antenna

Used mostly indoor

No time diversity

Dual antenna (circular &

vertical polarisation)

Harsh environments in satellite-

only reception

Large display


A challenging environment: direct satellite recepti on

S a te llited irec t p a th s

IM R

e .g . K u /K a -b a nd sa te lliteIM R fe eds ig na l

S a te llitee c ho p a th s

IM R e c hop a th /s c a tte r

P re d o m inan tIM R d ire c tp a th

S c a tte r o f IM Rd irec t p a th

D iffra c tion

S -b a nds a te llite s ig na l

S -b a n d IM Rs ig na l

E IR P TE IR P S

S c a tte r

L o S

� The satellite signal can occasionally experience deep and long fades (overpasses, trees, tunnels,..) . Unlike terrestrial networks, it is not economical to mitigate these effects by sheer increase of power.

� It is not economical to deploy terrestrial gapfillers everywhere.

� Time diversity is the solution.


MAIN CONFIGURATIONS CHOICES

� Waveform : SH-A (OFDM-sat/OFDM-ter) or SH-B (TDM-sat/OFDM-ter)

SH-A allows SFN operation between satellite and terrestrial (sat+ter).

SH-B cannot offer SFN (sat+ter) but more resilient to non-linearity. Requires at least 2 demodulators, but receivers can work in both SH-B network and SH-A network.

� Frequency : SFN (sat+ter) or MFN

SFN maximizes global capacity, easier for handover. Can be used only with SH-A.

MFN allows independent optimisation of satellite and terrestrial PHY parameters. Allows also independent optimisation of clusters of terrestrial transmitters and/or staged deployment of gapfillers.

� Physical Time interleaver : Short (~ 200-300 ms; Class-1 ) or Long (~10-30 sec; Class-2 )

“Short” is adapted to terrestrial propagation, requires less memory (4 Mbits)

“Long” is necessary for certain satellite conditions (long fades). Necessitates ~256 Mbits (Class-2)

“Long” can be configured to contain “Short” as a compatible sub-set. Compatible means receivers with limited memory (Class-1) can operate with “Long”, but with margin degradation.

� Link-layer FEC : MPE-IFEC extends MPE-FEC to provide protection against multi-burst losses.

Can be applied service-by-service


DO I HEAR ANY BETTER OFFERS ?

� Use state-of-the-art & proven waveform for multipath channels

� Use state-of-the-art & proven waveform for satellite nonlinearity

� Use state-of-the-art & proven FEC

� Optimised for Land Mobile Satellite channels

� Allows Single Frequency Network operation

� Allows receiver battery conservation

� Allows Statistical Multiplexing

� Allows Hierarchical modulation (OFDM only)

� Allows per-service differential protection (at Link-Layer)

� Co-existence with 2/3G

� Spectrum efficient


AT THE CONVERGENCE OF 3 WORLDS

SATELLITE

SATELLITE

BROADCASTER MOBILE OPERATOR


SHOULD I ENTER THIS….?

S-TIMI" 相符的内容相符的内容相符的内容相符的内容

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ISMACryp?

dvb-sh esa workshop2008 preso · 2020. 7. 19. · march 2008 : “dvb-sh implementation guidelines...

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