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DVB-x for delivering services. Mika Grundström [email protected] tel. 03-272 5894. Outline. Introduction Services DVB-x specifications MPEG over DVB-x Delivering data (IP) services Conclusions. Introduction. DVB project ETSI specified standards

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Dvb x for delivering services

DVB-x for delivering services

Mika Grundström

[email protected]

tel. 03-272 5894


Outline
Outline

  • Introduction

  • Services

  • DVB-x specifications

  • MPEG over DVB-x

  • Delivering data (IP) services

  • Conclusions


Introduction
Introduction

  • DVB project

  • ETSI specified standards

  • Delivery of video services but...

  • Broadcast is :

    • video

    • audio

    • data


Services
Services

  • Traditional service:

    • Broadcast video (MPEG-2 TS)

  • Newer services:

    • Enhanced/interactive television

    • VoD

    • KoD

    • MoD

    • Internet access



Dvb broadcast channels
DVB Broadcast Channels

  • There are number of broadcast channels:

    • DVB-S : Satellite

    • DVB-T : Terrestrial

    • DVB-C : Cable

  • Traditionally the use have been video broadcasting

  • In the future also data

  • Economical and massive bandwidth pipe for citizen’s Internet access


Dvb x standards
DVB-x standards

  • DVB-S

    • Satellite service and on-going

    • Video and data (uni-directionality)

  • DVB-C

    • Cable service, on-going

    • Video and Internet access (bi-directionality)

  • DVB-T

    • Terrestrial service , analog switch off

    • Broadcast video (regulatory issues)



Dvb s
DVB-S

  • Mature broadcast video service via satellite

  • Bit rate varies max 40 Mbps

  • Continental scope

  • Internet access and data services

  • Requires out-of-band return channel


Dvb c
DVB-C

  • Developing broadcast video service

  • Big potential in Internet access offering

  • Bit rates about 34 Mbps

  • Requires network update in many cases


Dvb t
DVB-T

  • Trial phase, three transmitters

  • Bandwidth capacity 20-32 Mbps

  • Mobile reception possible

  • Unidirectional

  • Data services limited (regulations)



Mpeg over dvb
MPEG over DVB

  • Traditionally MPEG-2 TS over DVB-x

  • Broadcast service

  • Other services - MPEG-2 TS is framing

  • How about Video over IP over MPEG-2 TS over DVB-x?

  • Multiplexing dilemma



Mpeg over dvb1
MPEG over DVB

  • Problem with the service provider

  • Duplicated service infrastructure

  • Content management problem

  • Service Information (SI) needed

    • User and Program information

    • Automatic tuning to TS

  • DVB Multimedia Home Platform (Java based)

    • Service creation


Providing data services
Providing data services

  • Sharing downstream large bandwidth

  • Requires return channel

  • Routing problem

  • Spectrum allocation management

  • Location based services



Data broadcasting
Data Broadcasting

  • DVB defined encapsulation

  • Multiprotocol encapsulation over MPEG-2 TS

  • Does not define a complete system model

  • Network operator has an option with the use of different technologies

  • Linking the Internet (bi-directional) and broadcast (unidirectional) channels is a challenge

    • routing issues

    • TCP acknowledgements

    • HTTP and other protocol support



Dvb data encapsulation options
DVB data encapsulation options

Application

Service

Adaptation

Service

Adaptation

Service

Adaptation

Service

Adaptation

Datagram IP

Service

Specific

Multiprotocol

Encapsulation

Data Streaming

DSM-CC

Private Data

Data Piping

PES

Section

MPEG-2 Transport Stream





Data delivery to portable device

demux & descra.

Data delivery to portable device

Optional MpegTS

DVB broadcast network

Multicast data

Mux & Scrambling

Feed sender

server

(router)

Broadcast

subnet

IGMP

Internet

Broadcast control &

management station

uHTTP

uHTTP

UDP

UDP

IP

IP

IP

IGMP

DVB mpe

X

X

DVB mpe

mux & scrambling

MPEG TS

MPEG TS

MPEG TS

DVB

DVB

DVB

DVB phy

phy

phy

phy


Protocol issues
Protocol issues

  • Service Announcement Protocol

    • Simple protocol for informing of multicast sessions

  • Service Description Protocol

    • Describes multimedia session properties

  • Uni-directional Link Routing

    • Routing over broadcast links

    • Currently not applicable

  • Unidirectional Hyper Text Transfer Protocol

    • Robust protocol to transfer HTTP

    • retransmissions and error correction


Conclusions
Conclusions

  • DVB Broadcast channels are cost-effective way providing Fast Internet Access

  • Content packaging is in key role

  • Mobile reception using DVB-T increases the number of users and possible applications

  • Technical solutions exist

  • Maturity to be achieved

  • Large scale deployment can be started today


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