Is Wireless (Data) Dead?
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Is Wireless (Data) Dead?
Heilmeier’s Vision
Marconi’s Vision
Presentation Outline
The Wireless Universe
Radio Basics
Radio Basics
Wireless Spectrum
Presentation Outline
Wireless Telephony not Dead!
Proliferation of Wireless Telephony
Cellular Phone Growth
Japan Unplugged
The Lessons of the Japanese Cellular Phone System
PCS = “Pretty Crazy Situation”?
Presentation Outline
Mobile Computing is theNatural Evolution of Computing
Global Markets for Portable Computers
Laptop Sales, Jan-Sept 1995
A Short History of Wireless Data
A Short History of Wireless Data
A Short History of Wireless Data
Some Observations
Technical and Economic Challenges
Promising Developments
Promising Developments
Promising Developments: GPRS
Promising Developments: Wireless Cable
Wireless ATM
What Every Happened to Ubiquitous Computing?
Wireless Data Success Story: UPS
Presentation Outline
Access is the Killer App
Overlay Network Challenge
Application Support Challenge
Wireless Overlay Networks
Proxy Architecture
BARWAN Architecture
BARWAN Architecture
Presentation Outline
Summary
Conclusions