Feedback indication method and apparatus

A feedback indication method, comprising:

• receiving, by a second device, a sensing request message sent by a first device, wherein the second device is connected to a third device, and wherein the sensing request message instructs the second device to send a null data packet announcement (NDPA), a null data packet (NDP) and a feedback request message to the third device;
• sending, by the second device, the null data packet announcement (NDPA), the null data packet (NDP) and the feedback request message to the third device after the second device receives the sensing request message, wherein the sensing request message comprises one or more first configuration parameters of the NDPA as well as information instructing the second device to determine one or more second configuration parameters of the NDPA, and the one or more first configuration parameters of the NDPA include a feedback time limit indicating that the first device will trigger a next feedback within a preset subsequent time period;
• receiving, by the second device, a first feedback of a sensing measurement result from the third device;
• sending, by the second device, a second feedback of the sensing measurement result to the first device, wherein the second feedback is sent by the second device after the first feedback is sent by the third device to the second device, and the first feedback of the sensing measurement result is sent from the third device to the second device after the third device receives the feedback request message.

A feedback indication apparatus, comprising:

• a processor, and
• a memory coupled to the processor to store instructions, which when executed by the processor, cause the feedback indication apparatus to perform operations, the operations comprising:
• sending a sensing request message to a second device connected to a third device, the sensing request message instructing the second device to send a null data packet announcement (NDPA), a null data packet (NDP) and a feedback request message to the third device after the second device receives the sensing request message, wherein the sensing request message comprises one or more first configuration parameters of the NDPA as well as information instructing the second device to determine one or more second configuration parameters of the NDPA, and the one or more first configuration parameters of the NDPA include a feedback time limit indicating that the feedback indication apparatus will trigger a next feedback within a preset subsequent time period;
• receiving a second feedback of a sensing measurement result sent by the second device, wherein the second feedback is sent by the second device after a first feedback of the sensing measurement result is sent by the third device to the second device, and the first feedback of the sensing measurement result is sent from the third device to the second device after the third device receives the feedback request message.