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1. WO2021061108 - DÉTECTION DE RADIOFRÉQUENCE PENDANT UN ESPACE ENTRE TRAME DANS UN SYSTÈME WI-FI

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WHAT IS CLAIMED IS:

1. An apparatus comprising:

a transceiver configured to transmit during a first frame in a first time interval and a second frame in a second time interval, wherein the first and second time intervals are separated by an interframe space (IFS); and

a processor configured to generate a sensing waveform, wherein the transceiver transmits the sensing waveform during the IFS.

2. The apparatus of any previous claim, wherein the IFS has a duration sufficient to receive a last symbol of the first frame, process the first frame, and respond with a first symbol of an earliest possible response frame.

3. The apparatus of any previous claim, wherein the sensing waveform is at least one of an orthogonal frequency division multiplexing (OFDM) signal, a Wi-Fi training sequence, a Zadoff Chu sequence, and a Gold Code.

4. The apparatus of any previous claim, wherein the transceiver is configured to transmit the sensing waveform after a transition time interval at the beginning of the IFS, wherein the transition time interval has a duration sufficient to allow the transceiver to transition from a transmit mode to a receive mode.

5. The apparatus of any previous claim, wherein the transceiver is configured to:

transmit a request for a measurement signal from a wireless node;

receive, at a first reception time, the measurement signal from the wireless node in response to the request;

transmit, at a first transmission time, an acknowledgment signal in response to receiving the measurement signal; and

receive a result signal in response to the acknowledgment signal, wherein the result signal includes information indicating a second transmission time of the measurement signal and a second reception time of the acknowledgment signal.

6. The apparatus of any previous claim, wherein the processor is configured to determine a round-trip time between the apparatus and the wireless node based on the first and second reception times and the first and second transmission times.

7. The apparatus of any previous claim, wherein the transceiver is configured to transmit the sensing waveform during the IFS in response to instructions received from a controller.

8. The apparatus of any previous claim, wherein the transceiver is configured to determine a transmission power for the sensing waveform based on topology information for other wireless nodes.

9. An apparatus comprising:

a transceiver configured to transmit during a first frame in a first time interval and a second frame in a second time interval, wherein the first and second time intervals are separated by an interframe space (IFS); and a processor configured to switch the transceiver from a transmit mode during the first time interval to a receive mode during the IFS, wherein the transceiver receives a sensing waveform from a wireless node during the IFS.

10. The apparatus of any previous claim, wherein the IFS has a duration sufficient to receive a last symbol of the first frame, process the first frame, and respond with a first symbol of an earliest possible response frame.

11. The apparatus of any previous claim, wherein the sensing waveform is at least one of an orthogonal Frequency division multiplexing (OFDM) signal, a Wi-Fi training sequence, a Zadoff Chu sequence, and a Gold Code.

12. The apparatus of any previous claim, wherein the transceiver is configured to switch from the transmit mode to the receive mode during a transition time interval at the beginning of the IFS.

13. The apparatus of any previous claim, wherein the transceiver is configured to: receive a request for a measurement signal from a wireless node;

transmit, at a transmission time, the measurement signal from the wireless node in response to the request;

receive, at a reception time, an acknowledgment signal in response to transmitting the measurement signal; and

transmit a result signal in response to the acknowledgment signal, wherein the result signal includes information indicating the transmission time and the reception time.

15. The apparatus of any previous claim, wherein the processor is configured to switch the transceiver from the transmit mode to the receive mode in response to instructions received from a controller.

16. The apparatus of any previous claim, wherein the processor is configured to determine at least one of presence of an object or person, a range of the object or person, an angle of the object or person, and a velocity of the object or person.

17. The apparatus of any previous claim, wherein the processor is configured to transmit information representative of the received sensing waveform to a controller, which uses the transmitted information to determine at least one of presence of an object or person, a range of the object or person, an angle of the object or person, and a velocity of the object or person.

18. An apparatus comprising:

a transceiver configured to exchange signals with a plurality of wireless nodes that are configured transmit or receive in frames during time intervals, wherein the time intervals are separated by an interframe space (IFS), and

a processor configured to select a first subset of the plurality of wireless nodes to operate in a transmit mode during the IFS and a second subset of the plurality of wireless nodes to operate in a receive mode during the IFS, wherein the first subset transmits a sensing waveform during the IFS.

19. The apparatus of any previous claim, wherein the IFS has a duration sufficient to receive a last symbol of the first frame, process the first frame, and respond with a first symbol of an earliest possible response frame.

20. The apparatus of any previous claim, wherein the sensing waveform is at least one of an orthogonal Frequency division multiplexing (OFDM) signal, a Wi-Fi training sequence, a Zadoff Chu sequence, and a Gold Code.

21. The apparatus of any previous claim, wherein the transceiver is configured to transmit the sensing waveform after a transition time interval at the beginning of the IFS, wherein the transition time interval has a duration sufficient to allow the transceiver to transition from a transmit mode to a receive mode.

22. The apparatus of any previous claim, wherein the transceiver is configured to instruct at least one of the plurality of wireless nodes to switch from a transmit mode to a receive mode or from a receive mode to a transmit mode.

23. The apparatus of any previous claim, wherein the processor is configured to modify members of the first subset and the second subset in a subsequent IFS.

24. The apparatus of any previous claim, wherein the processor is configured to perform at least one of randomly assigning the plurality of wireless nodes to the first subset or the second subset or using a round-robin scheduling technique to assign the plurality of wireless nodes to the first subset or the second subset.

25. The apparatus of any previous claim, wherein the processor is configured to interrupt transmission of the sensing waveform during the subsequent IFS.

26. The apparatus of any previous claim, wherein the transceiver is configured to receive information representative of the sensing waveform received by the second subset, and wherein the processor is configured to determine at least one of presence of an object or person, a range of the object or person, an angle of the object or person, and a velocity of the object or person based on the received information.