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

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

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

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