The architecture consists of three tiers: sensing, communication, and application. Physically, the sensing tier includes smart sensing devices installed on buses. The communication tier incorporates the infrastructure for data transmission between the monitoring devices and the servers located in the application tier.
- The sensing tier is responsible for sensing the air quality and reporting the sensed data. The monitoring devices measure the air quality at predefined positions on the bus routes. The devices also collect RSSI information that will be used to determine the bus locations.
- The communication tier is in charge of transferring the sensed data and the RSSI information measured by the monitoring devices to the servers. Fi-Mi plans to leverage a new form of opportunistic communication to balance between communication quality and cost.
- The application tier is imperative for controlling the behaviors of the monitoring devices, processing the sensed data, and providing interactive services to users.