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Mobile computing is transforming how we access and use services across different demographics. With 27 million internet-capable mobile subscribers and 50,000 iMode websites as of October 2001, the iMode platform is revolutionizing mobile internet access and multimedia services. This study explores the design and deployment of mobile services, emphasizing the importance of seamless connectivity, location services, and context-aware applications. It highlights the significance of service diversity and the evolution of user needs in a post-PC world, addressing challenges like mobility, hardware heterogeneity, and connectivity variations.
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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
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
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,
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)
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
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
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?
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
Building context-aware applications? • Context is a key factor for mobile computing • Typical context: time, location coordinate, personal profile, etc.
Typically: Identity, location, time • Rest is implied • Not much else used: activity, mood, etc.
Design Process Using Tools? For your information only Not required for the exam
