A communication apparatus comprises primary connectivity radio (PCR) circuitry which, in operation, exchanges a wake up radio (WUR) mode setup frame with a communication partner apparatus in awake state; and wake up radio (WUR) circuitry which, in operation, receives a wake-up frame from the communication partner apparatus, wherein upon successful completion of the WUR mode setup frame exchange in mode other than WUR mode, the communication apparatus enters the WUR mode in which the WUR circuitry is in state to receive a WUR frame, and wherein upon receiving the wake-up frame by the WUR circuitry in the WUR mode, the PCR circuitry changes current state to the awake state.