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Overview of Mobile Computing (2): Applications and Services

Overview of Mobile Computing (2): Applications and Services. The iMode Story: It is About Services!. 27M Internet-capable cell phone sub-scribers (10/01); 50K iMode Web Sites World’s largest ISP, first to deploy 3G “Freedom of Multimedia Access” (FOMA) Not just about Japanese teenagers.

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Overview of Mobile Computing (2): Applications and Services

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  1. Overview of Mobile Computing (2): Applications and Services

  2. The iMode Story: It is About Services! • 27M Internet-capable cell phone sub-scribers (10/01); 50K iMode Web Sites • World’s largest ISP, first to deploy 3G“Freedom of Multimedia Access” (FOMA) • Not just about Japanese teenagers Applications Used User Ages Economist Magazine, 13 Oct 2001

  3. In the post-PC age… • Not just about gadgets or access technologies • About services and applications,and how the network can best support them • Increasing, not decreasing, diversity • Bottlenecks moving from core towards edge • Enabled by computing embedded in communications fabric: wide-area, topology-aware, distributed computing

  4. Services for Mobile Networks • How to build services for end users in a mobile and wireless networking environment: • Issues and service types • One example: universal interactor,

  5. Grand Goal of “AAA” Mobile Services AAA Service: “Any time, Any where, Any form” service • Any time: it is about wireless (time-domain quality) • Any where: it is about mobility (space-domain quality) • Any form: it is about device diversity (systems quality)

  6. Issues in building mobile services • Mobility induced issues: • Seamless services: service migration • Location services: location itself is a service • Heterogeneity induced issues: • Hardware diversity • Client devices & different networks • Software diversity • System software: OS, networking protocols • Application software • Wireless induced issues: • Time-varying network connectivity: disconnection, partial connection, full connection

  7. Possible services types • Location service • Location-transparent services • Hide locations from users: same as old Internet • Location-dependent services • Services “local” to a geographic location • Not available globally • Location-aware services • Services are globally available, but multiple instantiations of the same service are a function of locations • Service adapts to a location

  8. How to Provide Location Services • GPS at every node • GPS at a few reference points • Build recursive location services through reference hierarchy • Geometric triangle computation • Cricket system • Identify the current cell • What about location tracking?

  9. Services • Location transparent services: • If lower-layer provides mobility support, this is not a big issue • Location-dependent services: • Local currency exchange when visiting foreign country • Location aware services: • example: finding a nearby bookstore while driving • Issue: service migration from old server to the new server • Solution: location-adaptive

  10. Building context-aware applications? • Context is a key factor for mobile computing • Typical context: time, location coordinate, personal profile, etc.

  11. Typically: Identity, location, time • Rest is implied • Not much else used: activity, mood, etc.

  12. Design Process Using Tools? For your information only Not required for the exam

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