A radio frequency identification (RFID) tag and a method of monitoring Quality of Service (QoS) of a RFID tag

A radio frequency identification (RFID) tag, said RFID tag comprising:

• a first communication module adapted and configured to receive signals from a RFID reader, said first communication module including an element for extracting energy from the received signals providing a supply voltage Vdd to the RFID tag;
• at least one energy storage module in connection with and supplied by the first communication module adapted and configured to store said extracted energy from the received signals of the RFID reader;
• a second communication module adapted and configured to communicate with at least one external device;
• and
• a power output in connection with and supplied by the second communication module adapted and configured to provide a power-supply voltage to said at least one external device using said stored energy;
• a control module in connection with the second communication module, said control module being adapted and configured to perform a tracking of said power-supply voltage provided by said power output to the at least one external device, the control module being further in connection with the first communication module
• wherein the first communication module being further adapted and configured to transmit to the RFID reader a quality indicator of an energy status of the RFID tag based on a result of said tracking.