Security Enhanced Indoor Location Tracking System for Ubiquitous Home Healthcare

Advances in sensor networking and location tracking technology enable many location-based applications but they create significant privacy risks. This paper describes our study on design of security enhanced indoor location-tracking system for in-building, ambient discovery application, location-dependent healthcare applications. Ceiling-mounted beacons are spread throughout the building which publish location information on RF and ultrasonic signals and allows applications running on mobile and static nodes to learn their physical location. The object to be tracked carries listener node, this node listens the beacons information as they arrived and forwards these beacons signals to the base station. A listener computes its position within the coordinate system, using the distances from multiple beacons with known beacon coordinates. This paper concentrates on privacy problem location aware sensor networks, since location information is especially privacy sensitive and potentially specific enough to reveal the identity of individuals. Also describe two ubiquitous home healthcare applications that use the location-tracking problem which we have implemented.