DVB-x © Mika Grundström 7/15/20151 DVB-x for delivering services Mika Grundström...

DVB-x © Mika Grundström 04/19/23 1

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 Delivery of video services but... Broadcast is :

– video

– audio

– data


Services

Traditional service:– Broadcast video (MPEG-2 TS)

Newer services:– Enhanced/interactive television

– VoD

– KoD

– MoD

– Internet access


The use of DVB containers


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-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 used in the world


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

Developing broadcast video service Big potential in Internet access offering Bit rates about 34 Mbps Requires network update in many cases


DVB-T

Trial phase, three transmitters Bandwidth capacity 20-32 Mbps Mobile reception possible Unidirectional Data services limited (regulations)


DVB-T radio


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


Packetisation


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


5

DVB SI Model

Satellite Cable Terrestrial

Transponder1

Transponder1 Transponder

2


3


T

TransponderT Channel

1

Channel1 Channel

2

Channel2 Channel

C

ChannelC Channel

1

Channel1 Channel

2

Channel2 Channel

C

ChannelC

Service1

Service1 Service

2

Service2 Service

3

Service3 Service

S

ServiceS

Service1

Service1 Service

2

Service2 Service

S

ServiceS Service

1

Service1 Service

2

Service2 Service

S

ServiceS

VideoVideo

Audio 1Audio 1

Audio 2Audio 2

DataData

Bouquet

Networks

Transport Streams

Services

Components


6

SI Features: NIT

Network Information TableIdentification of transmission as a member of a

group of multiplexes - “Network”

Network Name

Tuning parameters with support for variousdelivery media• List of additional frequencies for terrestrial

transmission

Designed for simple transcoding of transportstreams


Providing data services

Sharing downstream large bandwidth Requires return channel Routing problem Spectrum allocation management Location based services


DVB-S data reception


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


Data packetisation options


DVB data encapsulation options

MPEG-2 Transport Stream

Data Piping

ServiceAdaptation

PES

Data Streaming

Section

ServiceSpecificDSM-CC

Private Data

MultiprotocolEncapsulation

Datagram IPServiceAdaptation

ServiceAdaptation

ServiceAdaptation

Application


MAC address structure

1 2 3 4 5 648-bit MAC address:

tableid

.... sectionlength

MACaddress

6… …

MACaddress

5

MACaddress

4

MACaddress

3

MACaddress

2

MACaddress

1

LLC_SNAP_flag

Datagram,stuffing and

CRC

SectionSyntax :

MSB LSB

8 Bytes


DVB data broadcast system

demux & descra.mux & scrambling

Broadcast operatornetwork

Broadcastsubnet

Internet

Feed sender( IP router )

Optional MpegTS Mux & Scrambling

Homesubnet

DVB broadcast network

Feed receiver(e.g. STB)

IP

DVB mpe

DVBphy

MPEG TS

X X

DVB phyDVBphy

MPEG TS

IP

X

IP

DVB mpe

MPEG TS

DVB phy(interface)


Data delivery using multicast in DVB

demux & descra.mux & scrambling

Broadcastsubnet

Internet

Feed sender(router)

Optional MpegTS Mux & Scrambling DVB broadcast network

Feed receiver(e.g. STB)

IP

DVB mpe

DVBphy

MPEG TS

X X

DVBphy

DVBphy

MPEG TS

X

IP

DVB mpe

MPEG TS

DVB phy

IP

X

UDP

uHTTP

IGM

P

Broadcast control &management station

IP

UDP

uHTTP

UDP

uHTTP

jshfjhsdfgjhsbhsdf

jshfjhsdf

Multicast dataserver

IGMP IGMPIGMP


Data delivery to portable device

demux & descra.

mux & scrambling

Broadcastsubnet

Internet

Feed sender(router)

Optional MpegTS Mux & Scrambling DVB broadcast network

IP

DVB mpe

DVBphy

MPEG TS

X

DVBphy

DVBphy

MPEG TS

IP

DVB mpe

MPEG TS

DVB phy

IP

X

UDP

uHTTP

IGM

P

Broadcast control &management station

UDP

uHTTP

Multicast dataserver

IGMP


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

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

DVB-x © Mika Grundström 7/15/20151 DVB-x for delivering services Mika Grundström...

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