File:Gsi.pdf

Wireless sensor networks can potentially become larger, more prevalent, and interconnected via the Internet, forming a global sensing infrastructure that serves many users. In order to realize this and maximize its utility, it is necessary to develop a software architecture that enables new components to be integrated, multiple applications to share the same sensing substrate, and the integration of sensor and IP networks. We propose one such architecture that encodes applications as malleable, platform-independent, highlevel mobile scripts. Multiple users are supported by allowing these scripts to execute concurrently, while flexibility is achieved by having them invoke platform-specific services. Services provide reusable functional capabilities that may vary across platforms and environmental conditions. They are platform-specific and may be discovered and redeployed on-demand at runtime. Service provision allows applications to exploit whatever computational capabilities are available, and new services to be added in response to changing application needs, resource availability, or environmental conditions. Our approach allows applications to function in diverse settings by employing dynamic rebinding of mobile scripts to different services as they execute over extended intervals across different types of networks.