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ECET 581/CPET/ECET 499 Mobile Computing Technologies & Apps

ECET 581/CPET/ECET 499 Mobile Computing Technologies & Apps. Introduction to Mobile Computing & Technologies Lecture 1 Paul I-Hai Lin, Professor Electrical and Computer Engineering Technology Indiana University-Purdue University Fort Wayne. Mobile Computing?.

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ECET 581/CPET/ECET 499 Mobile Computing Technologies & Apps

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  1. ECET 581/CPET/ECET 499Mobile Computing Technologies & Apps Introduction to Mobile Computing & Technologies Lecture 1 Paul I-Hai Lin, Professor Electrical and Computer Engineering Technology Indiana University-Purdue University Fort Wayne

  2. Mobile Computing? • Computer History & Applicationshttp://www.ecet.ipfw.edu/~lin/Presentation/CompNetApps11_17_files/frame.htm • Mainframe (IBM 360) • Microcomputers • Microcontrollers • Networking • Dialup, TCP/IP, Ethernet LAN, WAN, Wi-Fi, WLAN • Client-Server Computing • Web server • File Server • Database server • Distributed Computing • Mobile Computing • Peer-to-peer Computing • Grid Computing • Wireless Communication

  3. Distributed Computing

  4. What is Mobile Computing? • Mobile Computing • Computing Platforms: PDAs, Smartphone, Pocket PCs, Tablet PCs, Laptops • Networked embedded processors & apps • Information & computing anytime, anywhere • Distributed computing • Nodes (computers) • Communications • Computing tasks • Wireless communication

  5. Mobile Computing Applications User Groups • Cellular phone/VoIP • Personal Information Management (PIM) • Mobile Internet Access • Mobile Multimedia Entertainment • Business User Applications • Mobile Enterprise • Retail/Supply Chain • Intelligent Transportation • Maintenance and Field Service • Healthcare • Homeland Security/Emergency • Military

  6. Mobile Computing Applications • Email • Internet access • Personal Information Management (PIM) • Instant Messaging • Data & information access • Context-aware applications • Audio streaming • Video streaming • Cell phone • VoIP via WiFi

  7. Mobile Computing Constraints • Resource-poor • Battery packs • Hardware: Memory, CPU, peripherals • Software – Middleware • Less secure and less reliable • Lost or stolen • Hostile or unfriendly environment • Mobile connectivity • Dynamic changes in environment: infrastructure • Highly variable: bandwidth, latency • Reliability: disconnections

  8. Adaptability – the Key to Mobile Computing • Vision • Dynamic changes in computing environment • System agility • Roam seamlessly • Perform computing and communication task uninterrupted • A scenario • Video streaming application • Routing video stream packets • Access points • New IP address

  9. Mobility Transparency • Mobile computing - a form of distributed computing • Application-Transparent Adaptation • Access transparency • Location transparency • Failure transparency • Adaptive system is responsible for adaptation (sufficient?)

  10. Application-Aware Adaptation • Multimedia Application • Video Conferencing • Mobile devices • Remote server • Operating condition changes • Move/bandwidth changes • Request other peer/server • Lower quality video • Battery power level changes • Conserve energy • Reducing the intensity of the back light (display)

  11. Mechanism for Adaptation • Adapting Functionality of Mobile Application • Adapting Data – delivered • Partition of duties • Connected - Client-Server (CS) model • Disconnected – Mobile client works autonomously

  12. Adapting Functionality • Change dynamically the functionality of the computational entities • Client/Server • Resource-poor mobile client requests a resource-rich server to perform expensive computation • Request-Response model • Persistent connection state model

  13. Adapting Functionality • Extended Client/Server • Maintain the state of the clients: hard state, soft state • Request service → Sleep (conserve energy) → Wake up (get result) • Resource Reservation Protocol (RSVP, RFC 4604, 4605) • Internet Group Management • Middleware request services • Web pages ← Web servers • Database server • Temporary IP addresses • Name translation

  14. Adapting Data • Information Quality • Performance • Latency: from the Mobile client’s perspective • Throughput: from the system’s perspective • Data maintained at remote server • Reference copy • Up-to-date • Mobile client – may choose to access or manipulate data item of lower fidelity

  15. Adapting Data • Fidelity • Agility • Consistency • Data quality • Video data – frame rate and image quality • Spatial data such as topographic maps – minimum feature size • Telemetry data – sampling rate and timeliness

  16. Adaptations How To • Software • Middleware layers • Operating system • State Transitions • Strongly connected • Weak connectivity • Weak connectivity/Disconnected → Strong connectivity • Disconnected

  17. Where ? Adaptations • Client /Proxy/Server • Proxies: • Filtering data • Connections (security firewalls) • Modifying control data (network address translator) • Transcoding (converting data, content transformation) • Adapting to the hardware/software capabilities – in the proxy and/or at the server • Adapting to the connectivity of the mobile device: at the server and/or the client • Adapting to the resource availability at the mobile device: at the client

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