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Content Delivery Networks in ‘Share it’ TV Systems A complementary distribution chain to TV broadcast using networked Personal Video Recorders The Share it! project: 

Content Delivery Networks in ‘Share it’ TV Systems A complementary distribution chain to TV broadcast using networked Personal Video Recorders The Share it! project Bostjan Marusic*, John Morris** *Faculty of Electrical Engineering, University of Ljubljana ** Philips Research Laboratories

Talk outline: 

Talk outline Trends and drivers Overview of the state-of-the-art The Share it! Project and its approach P2P networking Usage scenarios enabled by Share it! Physical and logical network architecture Bandwidth and transcoding issues Challenges Conclusion

The changing world of television: 

The changing world of television Trends and drivers: “watch it when you want” Your own personal channel Interactivity (selection mechanisms, downloadable applications) Users taking an active role in the content creation Always on (24/7) broadband Internet becoming a reality Challenges for the traditional broadcast distribution model

The changing world of television: 

The changing world of television PVRs promise to revolutionize the way TV is watched: “The death of prime-time” - Broadcast times and schedules become less relevant to the user Users can use Metadata to search for programmes New convenient ways to record programmes From the promotional trailer Direct recording of a series (a programme group) Watch segmented programmes (eg highlights) Interactive content selection (eg browse the News)

Personal Video Recorders: 

Personal Video Recorders PVR = local storage + personalization Powerful signal processing, cheap mass storage devices (over 100 hours), always-on Internet access Personalization based on User profiling In respect to content type (genre) In respect to content acquisition mechanisms, presentation Automatic selection and storage of content according to user’s preference (profiles) Agent Recommendations Content aggregation into personalised “virtual channels” Mixing of broadcast and locally stored content

State-of-the-art in PVR technology: 

State-of-the-art in PVR technology TV-Anytime standardization efforts The TV-Anytime Forum is a global association of organizations that develops specifications to enable audio-visual and other services based on mass-market high volume digital storage in consumer platforms – simply referred to as local storage (see Four key specifications, which cover metadata, content referencing and location resolution, rights management and protection, and an overall systems specification. Interoperability Multimedia Home Platform MHP A standard for downloadable java applications

State-of-the-art in PVR technology: 

State-of-the-art in PVR technology PVRs have an IP connection Remote management (remote recording) Enables 3rd party service provision (additional metadata)

The Share it! Project: 

The Share it! Project ShareIt! An IST funded project - Consisting of: CE manufacturers (Philips) Broadcasters (BBC, NOB), Network providers (KPN, Elisa) and Research Organisations (FhG, UoL) The partners worked together on the myTV project developing the first TV-Anytime implementation ShareIt! takes the next step in the PVR revolution A distributed storage networking of PVRs – using P2P mechanisms Provides a complementary programme distribution mechanism Lets users become content and service providers Enhances the user experience as well as providing

The Share it! System: 

The Share it! System

P2P networking – A new style of distributed computing: 

P2P networking – A new style of distributed computing P2P is a new style of distributed computing in which: networked nodes share resources (content, bandwidth) The network topology is decentralized Easy deployment Fault tolerance In general all nodes in the network are equal Some may provide some additional services Every node can communicate with any other node No intermediate servers. Originally publicised by content exchange New developments aim to provide professional grade solutions: Standardising P2P communication protocols Performance Security

Scenarios Enabled by Share it!: 

Scenarios Enabled by Share it! An end-user can search for content Regardless of the source (broadcast or network storage) If a programme has been stored in the network the user can access it An end user can connects to the system remotely and can view and manipulate stored content. An end user grants access to a limited set of his own content to another user of the Share it! system, possibly in another home. Users form groups of users based on their interests. Personalized virtual channels can be created mixing broadcast local and network stored content

P2P Functionality in Share it!: 

P2P Functionality in Share it! Discovery of devices/users in the network No central directory required Search for Content Search queries and responses are propagated through the network on a hop-by-hop basis Advantages Alternative content sources Load balancing Insensitivity to node failure - fault tolerance Things that are not P2P in Share it! Once content is located the actual transfer is achieved by conventional CS mechanisms Some rights management models require a centralized entity (rights broker)

The Share it! network: 

The Share it! network Logical level Users self organize into user groups – interest groups User groups are the logical context in which content is being exchanged Groups provide a means to authenticate users joining groups A user can join multiple groups simultaneously Network organization (topology and protocols) Is a home-to-home network In-home devices use the same protocols They are behind a gateway (assumed to be not aware of Share it!) In-home devices have different access privileges

Bandwidth assumptions and transcoding: 

Bandwidth assumptions and transcoding The available bandwidth to the Share It! depends on the physical connection - typically for ADSL upload (from the box) 200 kbit/s, download (to the box) 1 Mbit/s Inside the home bandwidth (symmetric): 10 Mbit/s


Challenges Content identification and acquisition in the P2P world Rights Management and protection of distributed content Bandwidth considerations and transcoding Seamless integration of broadcast and stored content Scalability of P2P networking solutions


Conclusion Networking PVRs complement and enhance traditional broadcast models End users benefit from a richer experience Enables consumer and community content creation New types of service combining stored and broadcast content and using new distribution methods are enabled Network operators, content creators, equipment manufacturers and other players in the chain will benefit from the increased demand for their products and services generated by the enhanced system capabilities.

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