Efficient concurrent transmission of a wake-up signal and user data

A method at a receiving device having a wake-up receiver (WUR) and a main transceiver, wherein the WUR uses less power than the main transceiver to listen for a wake-up signature (WUS) in order to wake up the main transceiver to receive user data, the method comprising:

• detecting, at the WUR, a WUS targeted for the WUR in a received signal,
• wherein the WUS is frequency-division multiplexed with user data for one or more other receiving devices by allocating, in the frequency domain, multiple resource units for sending the WUS that are not contiguous in the frequency domain, and
• wherein a number of the multiple resource units for sending the WUS change from one packet to the next depending on channel conditions experienced by the WUR and a number of users that need to be served;
• and
• waking up the main transceiver in response to detecting the WUS.

A transmitting device, comprising:

• transceiver circuitry configured to receive and transmit signals;
• and
• processing circuitry operatively associated with the transceiver circuitry and configured to:
• frequency-division multiplex a wake-up signature (WUS) targeted to a wake-up receiver (WUR) of a first receiving device with user data targeted to a main transceiver of each of one or more other receiving devices into an output signal,
• wherein the frequency-division multiplexing comprises allocating, in the frequency domain, multiple resource units for sending the WUS that are not contiguous in the frequency domain, and
• wherein a number of the multiple resource units for sending the WUS change from one packet to the next depending on channel conditions experienced by the WUR and a number of users that need to be served;
• and
• transmit the output signal.

A receiving device, comprising:

• main transceiver circuitry;
• wake-up receiver (WUR) circuitry, wherein the WUR circuitry uses less power than the main transceiver circuitry to listen for a wake-up signature (WUS) in order to wake up the main transceiver circuitry to receive user data;
• and
• processing circuitry operatively associated with the main transceiver circuitry and the WUR circuitry, and configured to:
• detect, at the WUR circuitry, a WUS targeted for the WUR circuitry,
• wherein the WUS is frequency-division multiplexed with user data for one or more other receiving devices in the received signal by allocating, in the frequency domain, multiple resource units for sending the WUS that are not contiguous in the frequency domain,
• wherein a number of the multiple resource units for sending the WUS change from one packet to the next depending on channel conditions experienced by the WUR and a number of users that need to be served;
• and
• wake up the main transceiver circuitry in response to detecting the WUS.