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Communication within AmI

Communication within AmI. Communication as a ubiquitous activity. The Three Scenarios: Instant Messaging Integrated Traffic Information The Museum Visit Communication is a basic activity in all scenarios.

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Communication within AmI

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  1. Communication within AmI

  2. Communication as a ubiquitous activity • The Three Scenarios: • Instant Messaging • Integrated Traffic Information • The Museum Visit • Communication is a basic activity in all scenarios. • The characteristics of communication are subject to usage requirements and the context of deployment • Goal: A communication service supporting context-driven adaptation and integration with other services

  3. Communication as a ubiquitous activity • Communication Service: Properties • Message format: plain text – image – audio – video • Traffic Information: video output or text input not likely • Museum Visit: covers all multimedia aspects • Communication partners: users – devices • Instant Messaging: Friends talking to each other • Museum Visit: Automatic registration in the entrance hall • Employing different kinds of (wireless) transport media • Range • Bandwidth

  4. Communication as a ubiquitous activity • Communication Service: Properties • Uni- or bi-directional communication • Museum Visit: nowadays mostly one-way communication • Instant Messaging: real interaction • Resource requirements and current availability • Memory – processing power – bandwidth • Changes may trigger service adaptation • I/O requirements • Traffic Information: speech output is preferable • Discovery: Interoperability with other services • Traffic Information: interaction with a text-to-speech service • Instant Messaging: video streaming using a GPRS service

  5. Communication as a ubiquitous activity

  6. Communication as a ubiquitous activity • Communication Service: Example • Type of communication depends on the available bandwidth • Broadband connection is shared • Message events from the Internet Gateway Service notify all clients about a change in bandwidth • Components: • Audio Encoder and Decoder: Adaptable components for (de)compressing the audio stream (high, medium or low quality) • Video Filter: Optional component for reducing the video frame rate or resizing. • Video Encoder and Decoder: Adaptable components for (de)compressing the video stream (high, medium or low quality). • Controller: (de)multiplexes text, speech and video, and sends/receives the combined data stream.

  7. Communication as a ubiquitous activity • Communication Service: Adaptation • When? • @ Deployment time • @ Runtime • How? • Use a component-based development methodology • (Near)-optimal distributed deployment of all components • Adapt functionality: enable – disable – replace components • Relocate components • Using transparent proxies • (Strong) code mobility • Why? • Provide optimal quality of service

  8. Communication as a ubiquitous activity • Collaboration with other partners: • Who? • VUB/SSEL: Code generation of components • VUB/PROG: Proof of concept interoperability for code mobility • UGent: Performance analysis of components • LUC: User interface generation as front end for services • How? • Draco: Common component-based middleware in Java • Support for • Resource management and contract checking • Live-updates • Distributed-deployment of components

  9. Communication as a ubiquitous activity

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