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System Support for Mobile Adaptive Applications

Explore the challenges of pervasive networking, fluctuating connectivity for mobile users, and strategies for adaptive mobile applications. Learn about application-aware adaptation, fidelity measurement, agility, stability, and collaborative adaptation models. Discover how Odyssey's architecture enables resource control and adaptive decision-making.

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System Support for Mobile Adaptive Applications

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  1. System Support for Mobile, Adaptive Applications 2003. 4.8 Brian Noble, University of Michigan Presented by Hyeeun Choi

  2. Contents • Introduction • Application Vs. OS • Fidelity • Agility • Stability • Future Work • Conclusion System Support for Mobile, Adaptive Applications

  3. Introduction • Difficulty of pervasive networking • Quality of network connectivity afforded mobile users is extremely turbulent • Mobile application must deal with such fluctuation • How can deal with such fluctuation? • Ideal • Take advantage of high–quality connectivity • Behave reasonably with poor performance • What to do • To monitor and control resource • To make adaptive decision System Support for Mobile, Adaptive Applications

  4. Application Vs. OS • Application-Aware Adaptation • Odyssey’s approach : Collaborative Model • Policy decision to Application • Resource control to Operating System • The OS on the mobile node is wholly responsible for making adaptation decisions for applications. • Applications cannot choose to make their own adaptive decisions • Each application must inferthe resource consumption of the others. • Without a common point of resource control, cannot have accurate knowledge of one another Application-aware collaboration Application-transparent System Laissez-faire application System Support for Mobile, Adaptive Applications

  5. Architecture of Adaptive Client • Viceroy • Manage type independent task on client • Resource usage/availability monitoring • Notifying application of changes in resource availability • Single point of resource control Figure 3. Odyssey Client Architecture • Wardens • One per type • Provide all type specific functionality • Manage communication between client & server • Offer menu of fidelity to application System Support for Mobile, Adaptive Applications

  6. Fidelity • Measure of data quality • The degree to which a data item used by a mobile client • It is per type , not per application. • Some different dimension is possible • Related to adaptation policy • Require knowledge of item or type’s structure Figure 1. Fidelity dimensions for images System Support for Mobile, Adaptive Applications

  7. Agility • Agility • The Limit on Adaptation • Detecting change of resource availability • Viceroy’s role • By passive observation of network • Trace network RPC latency & bulk transfer rate • Estimate available bandwidth to server & notify application • Application can adapt changed environment via adaptive decision loop System Support for Mobile, Adaptive Applications

  8. Stability • Stability • Improving the use experience • If perceived difference between some fidelities is too large, • User can’t tolerate of frequent, perceptual large changes • Application must be skeptical of an increase in resource availability • Viceroy’s role VS Application’s role • Add information about expected variance of availability • Application can decide their own stability System Support for Mobile, Adaptive Applications

  9. Conclusion • Collaborative adaptation model • OS : adaptation mechanism • Application : adaptation policy • Powerful model • Consideration about • Agility • Stability System Support for Mobile, Adaptive Applications

  10. Extras

  11. Programming model • Programming model • A decision loop • Adaptive applications are equipped to handle different fidelities • proxy Figure 4. Adaptive Decision Loop System Support for Mobile, Adaptive Applications

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