Is there a meeting in this room right now? Context Fabric Jason I. Hong James A. Landay or, Infrastructure Support for Context-Aware Applications http://guir.berkeley.edu/projects/cfabric What is Context-Aware Computing? Context Specification Language The goal of context-aware computing is to provide tighter ties between the physical and social worlds we live in and the virtual world in which computers operate. Context-aware computing does this by expanding the richness and diversity of inputs that computers can sense. Provide a flexible and high-level interface for declaratively stating context needs. Location "What are the five nearest movie theaters?" Activity "Turn off my cell phone when I'm in a meeting or in a restaurant." Who is <this person / that person>? Identity + Proximity "Remind me to talk to Chris about Iron Chef next time I see him." Is <person> near <person>? Is <person> currently <busy / available>? Multiple "Where on earth was that picture taken?" "Is this a photo from Phoebe's wedding?" "Who is that sitting next to Ralph?" Is <place> currently <busy / available>? Where <is / was / will> <person>? What are the <N> nearest <people> right now? Problem - Still Very Hard to Build Context-Aware Systems However, there are still high barriers to entry. App developers must deal with distributed systems issues, sensors, recognition algorithms, and so on. An infrastructure provides an always-on “context dialtone” that all apps can rely on being there. Network Services Privacy? Automatic Path Creation Agents Coordinate available sensor input and services together to address queries made with the context specification language. What are the nearby movie theaters? Diverse Platforms Diverse Context Sensor and Context Fusion Sensor Input Data Ambiguity GPS ZIP ZIP Theaters GPS Sensor Input Context Output Nearby Movie Theaters Cell ZIP ZIP Theaters Cell Location Context Streams, Events, Queries Automatic Path Creation Probabilistic Framework Recognition Algorithms Sensor Input Cell GPS GPS ZIP ZIP Theaters Problem Areas Cell Location Is there a meeting in this room right now? Precision Granularity Accuracy Metadata wav single speaker? Sensor Input Diverse Sensors Unreliable Sensors au wav Proposed Solution Sound Context Output Probability of Meeting wav audible? fusion meeting? mpeg motion? Video