Datacast : A Scalable and Efficient Reliable Group Data Delivery Service for Data Centers
3G Multicast & IP Datacast
Transcript of 3G Multicast & IP Datacast
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Presenters:Sumanta Saha
Gorkem CakmakXirui Wang
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OverviewIPDC: IP Datacast – Sumanta Saha
3G multicast – Xirui Wang
Comparison and business models – Görkem Cakmak
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IPDC: OverviewDefinitionNeed for IPDCIPDC Network architectureUnderlying technologyPractical implementation example
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IP Datacast (IPDC): DefinitionAccording to IPDC Forum:
IP Datacasting is a broadcast technology which enables cost effective and efficient distribution of digital content to mass audiences. Technically, it makes use of the DVB networks to broadcast any IP based data.
Intuitively:It is a broadcasting technology focusing digital media on top of IP. IPDC targets to broadcast digital media as well as other services such as file, games, computer programs on top of IP, independent of access networks of the recipients.
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Why IPDC?From Operators’ point of view:
Cost effectiveEfficient way to reach mass people
From Content Providers’ point of view:Opens new way to reach mass marketCreates new business opportunities for new products
From Consumer point of view:New way to access services using various terminalsUninterrupted service over various access networks
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IPDC Layman’s Architecture
Ref: IPDC whitepaper, Nokia Corp.
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IPDC Reference Architecture
Content Creation
Service Application
Service Managem
ent
Interactive Network
Broadcast Network
Terminal
Adapted from: M Kornfeld, G may, “DVB‐H and IP datacast‐Broadcast to handheld devices”, IEEE Transactions on Broadcasting
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Content Delivery Protocols
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Content Delivery Protocols (Contd.)For convergence among bearer technologies, IPDC uses IP in network layer
Uses UDP as transport layer protocol due to its lightweight fast service
Bearer Technologies
IP
UDP
RTP
Source Coding
Real Time Content
FLUTE/ALC
Source Coding
File Based Content
Coding Encapsulation
ESG
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Content Delivery Protocols (Contd.)IPDC targets to deliver variety of service, such as, Video on demand, files, programs, gamesUDP is not enoughSeveral standard helper protocols are used
RTP for streaming dataFLUTE for file data
Bearer Technologies
IP
UDP
RTP
Source Coding
Real Time Content
FLUTE/ALC
Source Coding
File Based Content
Coding Encapsulation
ESG
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Electronic Service Guide (ESG)Metadata about the contentInforms user about the service availableInforms terminal about access rightsVery flexible: allows large number of possibilities such as description, clipart, trailers, related content linksUses PSI/SI tables of DVB‐T underneath
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Underlying Bearer technologyATSCDVB‐TDVB‐HDVB‐SHISDB‐T
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DVB‐TDeveloped by Digital Video Broadcasting (DVB) groupStands for Digital Video Broadcasting‐TerrestrialPopular broadcasting method for digital terrestrial TVTransmits in MPEG transport stream using OFDM
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DVB‐HSpin‐off of DVB‐T suitable for handheld devicesDominating underlying technology for IPDC5, 6, 7 and 8 MHz bandwidth can be usedExpects IP as upper layer protocolIncludes several diversions from DVB‐T to support handheld devices
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DVB‐H (Contd.)DVB‐H is IP based. It accepts IP packet and encapsulates it in DVB‐way (MPE=Multi Protocol Encapsulation)Two main features of DVB‐H
Time SlicingSends data in high rate bursts, in between sleep modeResulting power saving can be more than 90%
MPE‐FECExtra forward error correction for mobile environment(For extra‐enthusiastic radio guys) Combination of Reed‐Solomon code and extensive time interleaving with flexible configuration possibilities
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DVB‐H MobilityTwo types of handover
Passive: No interactivity channel. UA decides by assessing the quality of channel and PSI/SI channelActive: Interactivity channel required. IPDC subsystem offers handover. UA agrees.
Time slicing brings new opportunity for handoverLow power state can be used without disturbing userMakes smooth handover possible even with single receiver frontend
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IPDC deployment in Finland
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3G Multicast ‐ Sub AgendaAdvantages
3GPP2 – BCMCS
3GPP – MBMS
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Advantages
Enhanced Efficiency
Optimized Performance
Effective Distribution
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3GPP2 – BCMCSBroadcast and Multicast Services
A multicast‐for‐mobile solution for CDMA2000 or WCDMA networks
Flexible common radio channel suitable for point‐to‐multipoint and broadcast traffic.
EBCMCS & Media‐FLO
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BCMCS Scenario
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BCMCS Network Structure
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3GPP – MBMSMultimedia Broadcast/Multicast Service
Multicast technology in development within the 3GPP and is available for UMTS architecture.
UMTS release 6 – Two Proposed Architecture
New elements such as Broadcast Multicast ‐Serving Center (BM‐SC) and new procedures in UMTS network.
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Multicast Traffic Path Before MBMSCell Broadcast Service ‐ CBS
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WithUnicast GTP Tunnels
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WithMulticast GTP Tunnels
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MBMS – Technical FeatureSplit into the MBMS Bearer Service and the MBMS User Service
The MBMS Bearer Service includes a Multicast‐and a Broadcast Mode.
The MBMS Bearer Service uses IP Multicast addresses for the IP flows.
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MBMS Broadcast ModeA single source to multiple terminals in the associated broadcast service area.Broadcast Services = Push‐type Services
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MBMS Multicast ModeA return channel is required for interaction procedurals.
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MBMS – Technical Feature
GERAN MBMS offers between 32kbit/s and 128kbit/s. Up to 4 GSM Timeslot may be used for one MBMS bearer in downlink direction. UTRAN MBMS offers up to 256kbit/s per MBMS Bearer Service and between 800kbit/s and 1.7Mbit/s per cell/band. Multicast switch threshold: 5 – 10 terminals
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MBMS Architecture
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Two initiatives are on the track…
•Different backgrounds — digital television broadcast and ―third‐generation cellular telecommunications
•We shall provide a basic system reference model to compare architectural aspects
•Reference model of a generic end‐to‐end multicast system fits with a business model
IPDCInternet Protocol
Datacast
MBMSMultimedia Broadcast
Multicast Servicevs.
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The 3 C’s business approach for the reference model
ContentConnectionConsumption
• Business model deploys each of these domainsseparately or in a group
• Content provider operates a streaming server
• Service provider aggregates all these streams together.
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This model of a generic end‐to‐end system can be used as a baseline to compare with IP datacast and MBMS systems
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Definition: Enables programmed delivery of a broad selection of continuous mass media services over wide‐area.
Service example: 20 TV channels for mobile device available country‐wide
•Broadcast •VoD
Implementation:Networks: DVB‐S, ISDB‐T, DVB‐T, DVB‐H, DVB‐SH ATSC, DAB radio technologies.
New elements: Service system and IP encapsulator.
Definition: Efficient delivery of point‐to‐multipoint services for download and streaming. MBMS optimizes p‐t‐p services that are delivered to several receivers simultaneously.
Service example: News portal stored in the terminal ‐updated every hour
•Multicast Mode: Hot spot, large network area•Broadcast Mode
Implementation:Networks: Release 6 software updates required for GGSN, SGSN, RNC and Node‐B.
New element: BM‐SC required.
IPDC vs. MBMS
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MBMS IPDC
Infrastructure + +++Receiver +++ +Services +++ ++Regulation +++ +Complexity + +++Launch + +++
IPDC vs. MBMS
•Infrastructure:+ MBMS is more complex+ IPDC: gradual introduction throughhot spots
•Receiver:+ MBMS does not change anything to it+ IPDC: need a new receiver
•Services:+ MBMS offers more completethough integration with UMTS+ IPDC: offers full range of multicast services•Regulation:+ MBMS is very easy as this is in band regulatory rule+ IPDC: offers most uncertainties
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Business ModelsEffective business models are also an integral part in the establishment of a successful DRM system. oE‐commerseoBusiness models:
•Subscription‐based model
•Pay per view model
•Free to air model
•Promotion model
•Floating licenses model
•Challenges with pay per view and subscription models
o State Update Problem
o Digital Rights Locker
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DRM• The content and service protection picture is not clear yet
– How much service and content protection is in the broadcast
system, how much in the application / end‐to‐end service ?
– How to harmonize already defined mechanisms ?
– Likely that different broadcast systems (DVB‐H, 3GPP MBMS) will
have their own service protection mechanisms
• Where it will end up:
– Service protection: Broadcast system specific
• One for DVB/IPDC, one for MBMS, one for ….
– Content protection: OMA DRM 2.0 + broadcast extensions
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Thanks for listening
and
Questions?