2 IPTV BC en IPTV Related Technologies 1 PPT 201008(Draft) 36p

7/31/2019 2 IPTV BC en IPTV Related Technologies 1 PPT 201008(Draft) 36p

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IPTV Related Technolo ies

ZTE University

Contents

Digital TV Technology

Video Encoding/Decoding Technology

Streaming Media Technology

IPTV Bearer Network Technology

Digital Right Management (DRM) Technology


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En c o d e r

Headend

Service Operation Platform

DTV source

CA\ DRM

IPTV Architecture

CDN edge nodeCDN edge node

IP Networks

DTV

Technology

CDN edge node

Access network

Access networkAccess network

STB

STB

STB

Digital TV Technology Definition

Digital Television (DTV) technology is a new generationtelevision technology that adopts digital encoding andranspor ng ec no og es or e co ec ng, recor ng,broadcasting, transmitting and receiving of the TVprograms. It includes three parts: information source(transmitting end), information channel(transporting/storing) and information destination (receivingend).

DTV Categories

,categorized into Standard Definition Television (SDTV)and High Definition Television (HDTV). SDTV and HDTVwill coexist for quite a long period to satisfy differentcustomers demands.


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DTV's Advantages

Compared with analog TV, DTV has followingadvantages:

High-resolution TV image: comparable with DVD(lowest: 1280x720, highest: 1920x1080)

High quality acoustics

Rich of programs, high usage rate of wired network

High anti-interference ability, stable image

, ,stock information, online trade, distant learning, etc.

What is Standard Definition? SDTV

Standard Definition Television

Resolution and aspect ratio format are similar to analog TV

Aspect ratio 4:3 with resolution of 480i or 480p

Analog TV

PAL: 625 lines 25 frames/s

NTSC: 525 lines 30 frames/s

Full D1

PAL720x576Phase Alternating Line


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Bandwidth of High-definition Video

High-definition video source 1920x1080i/1080p

1280x720p

Bandwidth

MPEG212~20 Mbps

MPEG4 or WMV98~12 Mbps

H.2647~8 Mbps

Sub-conclusion

DTV includes: SDTV, HDTV

SDTV: 480i, 480P

HDTV: 720P, 1080i, 1080P


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Contents





Huge data of informationHuge data of information

Features of Video Services

288 lines288 lines

288 lines288 lines

ne:ne:

360 pixels360 pixels

ne:ne:

360 pixels360 pixelsPixel:Pixel:

24 bits24 bits

Pixel:Pixel:

24 bits24 bitsFrame rateFrame rate

30fps30fps

Frame rateFrame rate

30fps30fps

288X360X24X30=

174.65Mbit


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MPEG-2: Popularly used internationally

MPEG-4: Popularly used domestically

WMV9: Internationally

H.264: Mainstream of the future

AVS: China Standard

Evolution of Video Encoding/Decoding Standards


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H.264

Compared with other standards, saved ratio of bitrate

Video Encoding/Decoding Technology-AVS

AVS is a proprietary intellectual property of China.Its coding efficiency is 2~3 times higher than

- , equ va en o . . n a on, sbased on a concise technology design, and therealization complexity of chips is lower than that ofH.264.

H.264 is only a video codec standard. While AVS

, ,audio, and copyright management, which canprovide comprehensive solutions for digital video& audio industry.


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China Standard AVS

Disadvantages of AVS: MPEG-4 and H.264 are mature standards that have

een commerc a y app e on a arge sca e ointernational market and domestic IPTV industry.Therefore, it is very important to increase theindustrialization speed of AVS.

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At the narrow band time, due to slow Internet speed, video files have tobe downloaded to local before playing. It not only wastes time and diskspace, but also cannot meet the demand of play continuity.

Based on this demand, streaming media appears. It solves the play

continuity problem by simultaneously downloading, buffering andplaying the video file.

Download: File File

Streaming media:Frame 1Frame 2Frame 3Frame 4Frame 5

Transport Protocols of Streaming Media

RTP: Real Time Transport Protocol

RTCPReal Time Control Protocol

RTSPReal Time Streaming Protocol

RSVPResource ReSerVation Protocol

UDP User Datagram Protocol


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RTP/RTCP

RTP is a transport protocol of multimedia dataflow used for Internet/Intranet

RTP is used for the one-to-one or one-to-manytransport, providing time information andsynchronization of media streams.

Generally, RTP adopts UDP to transport data,especially for wireless environment.

RTP can be applied on TCP or ATM protocol as

well.

RTP/RTCP

RTP does not guarantee the sequencing deliveryof packets, neither does it provide traffic andconges on con ro . owever, oes.

RTCP together with RTP provides traffic controland congestion control services.

RTP cooperating with RTCP optimizes thetransport efficiency based on effective feedbacks

an m n m ze expenses, w c s su ta e orreal-time data transport on Internet.


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RSVP

Compared with traditional data transport, thetransport of streaming media data is much moresens t ve to atency. ere ore, guaranteebandwidth is not enough for the transport of highquality audio & video data.

RSVP is designed to reserve resources acrossnetwork.

can reserve a ract on o networ resources

(bandwidth) to provide QoS for the transport ofstreaming media.

RTSP RTSP was introduced by Real Networks and Netscape together. It

defines how to effectively transport media data for one-to-manyapplication. RTSP adopts TCP or RTP to complete data transport.

Compared with HTTP, RTSP is suitable for the transport of multimedia

data, while HTTP is suitable for the transport of HTML text. In addition,HTTP is a uni-directional service (The client machine sends the HTTP

request and the server responses the request). While RTSP is a bi-directional service, both the client machine and server can send therequest.


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Sub-conclusion

Streaming media technology is different from filedownload technology.

Streaming media technology is used tocontinuously deliver frames of video over IPnetwork, so that end-user can enjoy the videocontinuously without waiting and hard diskoccupying.

as c protoco : , ,

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Bandwidth

MPEG4: 1.2~1.5M per stream

. : per s ream

At least 2M per user

Channel switching delay

Multicast

IPTV Bearer Network Technology (Multicast)

Multicast network structure

ServerUser

Packet (sent once)

UserBroadcast TV vs VOD

Multicast vs Unicast

UserUser


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IPTV Bearer Network Technology (Multicast)

Static Multicast VS Dynamic Multicast For static multicast, the multicast distribution tree (MDT) is

established statically. The multicast stream is transported along the.

For dynamic multicast, the MDT is established according to theIGMP request from users, based on the multicast routing protocol.

Static multicast has less delay than that of dynamic multicast. It issuitable for IPTV.

Multicast Management

Controllable management on multicast data received by users

Management of multicast source

IPTV Bearer Network Technology (Multicast) Multicast QoS

Multicast is based on UDP. Hence, there is no re-transport

mechanism for lost ackets.

The upgrading of the routers in the backbone network and MANincreases the Qos capability, which guarantees the QoS of the

multicast services.

To guarantee the QoS of multicast services, generally, the abroadcarriers separate IPTV services from normal PC Internet services.Thus, multicast QoS is guaranteed by establishing a dedicated

channel for multicast stream.

Multicast duplication point

To save bandwidth, the duplication point should be placed near to

the end users. For ADSL, the duplication point can be placed atBAS or DSLAM.


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Sub-conclusion

Basic requirement for IP bearer network is:

Enough bandwidth

Supporting multicast

Better QoS guarantee

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DRM Technology

DRM technologies control use of digital media by preventing access, copyingor conversion to other formats by unauthorized end users. Firstly, DRM

encrypts video contents, then releases the contents through IPTV platform to

. ,system and then decrypt and decode the program.

DRM technologies involve standards of authorized language, encryption,encryption key management and architecture, etc. So far, there is no unified

standards suitable for operators. And the application of DRM must be

approved by the content providers.

The Principle of DRM

MediaServer

CopyrightServer

Web Server

Streaming

media

User


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DRM Technology

DRM is designed to suppress piracy to some extent. However, due to thefact that there is no effective cooperative mechanism between broadbandoperators and media content providers, there is no progress on the piracyproblem.

Under the broadband network environment, it is not suitable to keep theregulations of traditional copyright management by DRM technology.Actually, it attempts to realize a charge mode of traditional video servicethrough the approach of electronic commerce.

To absolutely solve the copyright problem, it is required to research a newcooperation method to realize a win-win situation under new commerceenvironment.

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2 IPTV BC en IPTV Related Technologies 1 PPT 201008(Draft) 36p