Download - Lecture slides
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IPTV
IP + TVProviding television over IP networks
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Television is still a major media type
• What users expect? - They switch on and select TV channels The goal of IPTV is to provide this but using IP network, instead of traditional broadcast over the air, cable, satellite. The difference from the ”Internet TV” is that there
is no waiting, buffering and QoS is like normal TV.
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How to make IPTV system?
• One has to define the requirements• On has to develop architecture for it satisfying the requirements This has been done in by Open IPTV forum, organisation grouping major industry interested
in this area. In March 2008 they released specifications for IPTV standard
We use it as an example of multimedia system design
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IPTV features
• Nowadays the features can not be only TV, IP networking and digital media offer much more possibilities, e.g. VOD – Video on Demand
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Basic architecture
• From the features the basic architecture follows
This is singel architecture supporting multiple services, there is managedpart and open Internet part. There are different providers in the system.
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What this architecture offers?• IPTV with Interactive Services
• Integration of Communication Services
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What this architecture offers cont.?
• Integration of Mobile & Fixed TV
There is a forecast the the number of users will grow fast, especially in Europe
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Conten Value Chain
• Who is involved in making the IPTV possible?
Standart TV
IPTV
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Key technology components
• The system can be realized if these components are defined
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Managed part of th system
These interfaces have to be defined
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Open Internet Part
No operator is needed
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The high-level architecture for both parts
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What this diagram means?
Functional entity performs certain functionrequired for the system operationThis function should be available at specificreference point. Reference points are markedBy their location and function e.g.UNI – User to Network InterfaceUNIT- UN Transport Interface
These elements have to be precisely definedfor the system
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Description- better text in specs, please look• Functional entities
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Description of reference points
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Architecture overview • High-level is not enough, we should have
architectural models of operation
OITF – Open Terminal Functional Entity – it is what terminal does
MANAGED CASE
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Unmanaged Internet case
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System logical operation
• Service Discovery and Service Access
Imagine there can bemany service providersand many services
This is managed Internet case
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System logical operation
• Service Discovery and Service Access
Imagine there can bemany service providersand many services
This is unmanaged Internet case
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Service provider and service discovery
Standard Web http calls
Service access
UNMANAGED CASE
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Service provider and service discovery
Standard Web http requestSIP SUBSCRIBE
MANAGED CASE
Service provider info
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Service provider and service discovery
SIP NOTIFY
MANAGED CASE
Service discovery info
Internet Gateway
Option: Using Multicast:
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Conclusion
• The Open IPTV architecture is very comprehensive• The standard is presented in a way typical for modern telecommunication systems: functional entities and reference points are defined and described
in detail. Next the system operation is explained using diagrams.• Open IPTV uses the concept of ”managed” and open
Internet. The managed part provides guarantees for content delivery and defines sets of protocols for
achieving this.