Heterogeneous wireless data transmission network

A heterogeneous wireless data transmission network comprising:

• a first master node;
• a second master node;
• a passive slave node including a first passive receiver and a first passive transmitter configured to modulate and reflect external RF signals, said passive slave node being configured to transmit data to the first master node by modulated backscatter (MBS) communication using the first passive transmitter;
• and
• an active slave node including a second passive transmitter configured to modulate and reflect external RF signals and a first active transmitter configured to transmit a modulated signal independently, said active slave node being configured to transmit data to the passive slave node using the first active transmitter, wherein
• one of the first and second master nodes is configured to wake up the passive slave node or the active slave node from a sleep state at any time by transmitting a wake-up signal to the passive slave node or the active slave node,
• the first passive receiver is configured to receive the wake-up signal and the first passive transmitter is configured to transmit data after the passive slave node is woken up from the sleep state,
• the second master node is configured to provide an electromagnetic field to allow MBS communication and does not take part in the MBS communication while providing the electromagnetic field, and
• only the first master node is configured to receive the data from the first passive transmitter when the second master node provides the electromagnetic field.