What is an RFID Tag consisting of an integrated circuit and an antenna used for in the perception layer?
RFID (Radio Frequency Identification) tags store unique identifiers read wirelessly by RFID readers, widely used in supply chain tracking, toll systems, and inventory access control.
Which type of RFID tag does NOT contain an internal battery and relies on electromagnetic energy transmitted by the RFID reader for power?
Passive RFID tags have no internal power source. They derive operating power from the radio waves emitted by an active RFID reader antenna via inductive/backscatter coupling.
What is the key advantage of Active RFID tags over Passive RFID tags?
Active RFID tags house an internal battery powering their transmitter, resulting in significantly greater signal range and continuous beaconing capability.
In ubiquitous IoT applications, what is 'Context-Awareness'?
Context-aware IoT systems gather ambient context parameters (location, ambient light, motion, temperature, user preference) to autonomously tailor services without explicit human commands.
What is the main role of a 'Digital Twin' in modern IoT architecture?
A Digital Twin is a dynamic software representation of a physical asset powered by real-time IoT data streams, allowing simulations, analytics, and fault monitoring.