A mobile user's presence and location information often forms important input for those applications and services that must anticipate on the user's context. Additionally, the ability to let a mobile device determine its location in an indoor environment at a fine-grained level supports the creation of a new range of personalized mobile Internet applications. The framework described here joins the concepts of presence, location and instant messaging (PLIM) in an extended existing instant messaging system, and uses a Bluetooth network infrastructure to let a mobile device determine its indoor position. Experiments show that location determination can be realized with a room level granularity. 1
['Arjan J. H. Peddemors', 'Marc M. Lankhorst', 'Johan de Heer']
Presence, location, and instant messaging in a context-aware application framework