LoRaWAN Device Classes

·        The LoRaWAN specification defines three device classes.

Class A

·        At any time an end node can broadcast a signal. After this uplink transmission (tx) the end node will listen for a response from the gateway.

·        The end node opens two receive slots at t1 and t2 seconds after an uplink transmission. The gateway can respond within the first receive slot or the second receive slot, but not both.

·        Class B and C devices must also support class A functionality.

Class B

·        In addition to Class A receive slots, class B devices opens extra receive slots at scheduled times.

·        The end node receives a time synchronized beacon from the gateway, allowing the gateway to know when the node is listening.

·        Class B device does not support device C functionality.

Class C

·        In addition to Class A receive slots a class C device will listen continuously for responses from the gateway.

·        A class C device does not support device B functionality.