A Three-Tier Architecture for User-Centric Ubiquitous Networked Sensing

Figure 1

UNETS environment: federated sensor networks. Sensor networks are installed everywhere, and users go through them with their own body-worn sensor network and the core device. Each sensor network has its own sensor database to which the data are accumulated. This picture contains four networks of static sensor nodes (SSNs) and two of mobile sensor nodes (MSNs). The user USER1 walks through this environment collecting the sensor data from surrounding nodes in his handheld device. After a series of activities, he goes back home where his permanent storage is located. The data are transferred from the core to the storage and accumulated there.