Network Working GroupM. McRoberts
Internet-DraftProject Baird
Intended status: InformationalJuly 4, 2010
Expires: January 5, 2011 

Project Baird: General System Overview


Project Baird is a collection of specifications defining means by which Internet-based services can be associated to television and radio broadcasts in a variety of deployment scenarios. This document provides a general overview of the project and system architecture.

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1.  Introduction

Project Baird is the name given to an effort intended to collate specifications in order to define an architecture by which broadcast television and radio programming can be augmented by Internet-based services.

Where possible, Project Baird makes use of existing standards - the intent is not to invent an entire ecosystem, but to bring together specifications which already exist in order to create a coherent environment.

Project Baird is deliberately agnostic in as many respects as possible: for example, any broadcasting system can be used provided services (stations) and events (programmes) can be uniquely identified in the form of fully-qualified domain names and URIs respectively.

The below sections outline expected deployment scenarios in general terms, followed by an brief overview of each of the different aspects of the Baird environment.

2.  Deployment scenarios

Project Baird is not a single specification to a particular environment either conforms or does not in a simple binary fashion: there are a range of different configurations with varying levels of functionality all of which fall within the scope of the project.

Project Baird is structured in this manner to allow for gradual adoption on the parts of both consumers and broadcasters: wholesale upgrades, while feasible to an extent on the part of broadcasters (cost permitting) is rarely a realistic proposition for consumers. For this reason, the first scenario described here involves no new reception hardware.

As Project Baird's aims are, first and foremost, to provide an open-ended architecture -- frameworks upon which applications can be developed -- the services which can be made available will only grow over time. Moreover, by specifying how existing systems can be augmented in order to make this possible, rather than seeking to define every aspect of a hybrid TV/Internet environment, it does not restrict the applications which can be developed: there is no central authority which must grant approval to content providers, independent developers or hardware vendors before applications, products and devices can be distributed -- each party only has to conform to the specifications for the functionality they implement.

2.1.  Traditional receiver with secondary devices

In this scenario, a consumer has a traditional receiver, for example a television with an integrated receiver, or some kind of set-top device; the receiver is not connected to the consumer's local network or the Internet at all.

However, the consumer does, have other devices which are Internet-connected: perhaps a laptop or a smartphone. An application or website can, once informed by the consumer as to which channel their receiver is tuned to, provide related content (including secondary audio/visual streams, timed events, or even a simulcast of the broadcast programme). Although the secondary device will not automatically be notified if the user switches channels, for example, there remains a broad set of functionality which can be made available.

If there are multiple devices operating on the local network, then they will be able to communicate and co-ordinate with one another regarding the programmes being received: for example, "household recommendations" could be presented which are intended to be appropriate not just to the single user but to the entire household based upon the presence of multiple devices.

2.2.  Hybrid receiver

An alternate scenario is one where a receiver is itself Internet-connected but does not communicate with any secondary devices. Many modern cable TV set-top boxes fall in to this category today.

As compared to the previous scenario, some aspects of the available functionality are enhanced, while others are handicapped. For example, the receiver holds the information regarding the current programme being received, and can communicate with Internet-based services directly in order to obtain secondary content, interactive applications, and some social features.

A hybrid receiver can be capable of whole range of applications, allowing delivery of content from both Internet-based and broadcast sources. Service discovery allows for applications and content related specifically to services and programmes (whether they're delivered via linear broadcast or via the Internet) to be automatically located and presented.

2.3.  Hybrid receiver with secondary devices

A consumer who has both a hybrid receiver and secondary devices is afforded the benefits of both of the preceding scenarios. This scenario offers a wealth of opportunities: rather than simply being disjoint collections of devices which happen to join the same network (and even then, only to access the Internet), devices can work together and coordinate in order to provide services to the consumer.

When combined with secondary devices, a hybrid receiver can act as a conduit, as well as a local -- private -- server for protocols such as XMPP upon which a range of highly localised and targeted applications could be developed (for example, programme recommendations with the benefit of context in the form of presence information).

Multiple devices working in tandem in this way leads to a vast range of possible applications from the comparatively basic -- such as remote control and inquiry over the network -- to the more complete, such as delivery of personalised, interactive, context-dependent content to secondary devices.

Secondary devices which have the ability to communicate with the receiver also allow applications to be implemented which, although theoretically possible with a stand-alone hybrid receiver, would suffer from usability issues when put into practice.

Author's Address

  Mo McRoberts
  Project Baird