1. Models and Infrastructure for Pervasive Computing
Wang-Chien Lee
Penn State University
NSF Worshop 1/24/02
Wang-Chien Lee

2. Pervasive Computing
Computing environment which contains billions of computing devices or information appliances, embedded in our living environment.
Applications
Smart home
Traveler guide
Weather Service
Challenges
Services (and modeling)
Infrastructures
Characteristics
Moving
Massive
Invisible
NSF Worshop 1/24/02
Wang-Chien Lee

3. Models New object classes Logical model of a device Context awareness
E.g., moving objects, personalization objects, and resource objects.
Semantically very rich
Logical model of a device
Including, capabilities, services offered, services subleased to other services, location, and temporal/spatial constraints.
Context awareness
Temporal and location properties of a device and other devices in the neighborhood, and the communities it established relationships with.
NSF Worshop 1/24/02
Wang-Chien Lee

4. Infrastructures
needed to link up information appliances and services on the network.
Web approach (i.e., URL/HTTP)
Difficult for clients to know the address of services that meets their needs
Expensive to implement
Service model for pervasive computing
A request is made when a device can’t answer it
The device doesn’t need to know the addresses of services, doesn’t care who provides them, don’t expect perfect/exact answers.
Implications
Look up services
Recursive composition of services
Communities
Active directories
NSF Worshop 1/24/02
Wang-Chien Lee