Systems and methods for motion detection using sensing transmission clusters
Systems and methods for Wi-Fi sensing are provided. A networking device is configured to transmit a sensing trigger message including information about a plurality of fast sounding sensing signals to be transmitted. The networking device receives the plurality of fast sounding sensing signals transmitted by a sensing transmitter in response to the sensing trigger message within a transmission opportunity. The networking device performs a plurality of sensing measurements on the plurality of fast sounding sensing signals wherein the plurality of sensing measurements include measurements of Doppler frequency information associated with motion in a sensing space.
1 . A method for Wi-Fi sensing carried out by a sensing initiator including at least one processor configured to execute instructions, the method comprising:
transmitting, by the sensing initiator to a sensing transmitter and a sensing receiver, a plurality of sensing sounding trigger frames, each of the plurality of sensing sounding trigger frames identifying a predefined number of high efficiency long training fields to be included within a respective sensing transmission to be transmitted by the sensing transmitter; and
receiving, by the sensing initiator from the sensing receiver, a first plurality of sensing measurements performed on one or more high efficiency long training fields included in a plurality of sensing transmissions from the sensing transmitter within one single transmission opportunity period, the one single transmission opportunity period representing an interval of time during which the sensing initiator has the right to initiate a frame exchange, each of the plurality of sensing transmissions including high efficiency long training fields corresponding to the predefined number,
wherein the first plurality of sensing measurements is used to detect a Doppler frequency of motion in a sensing space.
2 . The method of claim 1 , further comprising:
receiving, by the sensing initiator from the sensing receiver, a second plurality of sensing measurements performed on a plurality of sensing signals transmitted by the sensing transmitter, the plurality of sensing signals being transmitted in one or more availability windows and including a plurality of sensing transmissions spaced apart by at least two short interframe spaces (“SIFS”),
wherein detecting motion in the sensing space is further based on the first plurality of sensing measurements and the second plurality of sensing measurements.
3 . The method of claim 2 , wherein at least one of the plurality of sensing signals is transmitted in response to a sensing sounding trigger frame of the plurality of sensing sounding trigger frames.
4 . The method of claim 2 , further comprising receiving a time stamp associated with one or more of the second plurality of sensing measurements.
5 . The method of claim 1 , further comprising receiving a plurality of time stamps associated with respective ones of the first plurality of sensing measurements.
6 . The method of claim 1 , further comprising:
identifying, by the sensing initiator, the predefined number of high efficiency long training fields.
7 . The method of claim 1 , further comprising determining the predefined number of high efficiency long training fields to be included within the plurality of sensing transmissions to sense an object moving at at least a threshold speed within a channel of the plurality of sensing transmissions without aliasing.
8 . The method of claim 7 , wherein the threshold speed is 3.0 m/s.
9 . The method of claim 1 , further comprising detecting the Doppler frequency of motion in the sensing space according to the first plurality of sensing measurements.
10 . The method of claim 1 , wherein the predefined number of high efficiency long training fields is at least two.
11 . A system for Wi-Fi sensing comprising a sensing initiator and including at least one processor configured to execute instructions for:
transmitting a plurality of sensing sounding trigger frames, each of the plurality of sensing sounding trigger frames identifying a predefined number of high efficiency long training fields to be included within a respective sensing transmission; and
receiving a first plurality of sensing measurements, performed by a sensing receiver on one or more high efficiency long training fields included in a plurality of sensing transmissions within a transmission opportunity period, each of the plurality of sensing transmissions including high efficiency long training fields corresponding to the predefined number,
wherein the first plurality of sensing measurements is used to detect a Doppler frequency of motion in a sensing space.
12 . The system of claim 11 , wherein the processor is further configured for:
receiving a second plurality of sensing measurements performed by the sensing receiver on a plurality of sensing signals transmitted by a sensing responder, the plurality of sensing signals being received in one or more availability windows and including a plurality of sensing transmissions spaced apart by at least two short interframe spaces (“SIFS”),
wherein detecting motion in the sensing space is further based on the first plurality of sensing measurements and the second plurality of sensing measurements.
13 . The system of claim 12 , wherein at least one of the plurality of sensing signals is transmitted in response to a sensing sounding trigger frame of the plurality of sensing sounding trigger frames.
14 . The system of claim 12 , wherein the processor is further configured for receiving a time stamp associated with one or more of the second plurality of sensing measurements.
15 . The system of claim 11 , wherein the processor is further configured for receiving a plurality of time stamps associated with respective ones of the first plurality of sensing measurements.
16 . The system of claim 11 , wherein the processor is further configured for:
identifying the predefined number of high efficiency long training fields.
17 . The system of claim 11 , wherein the processor is further configured for determining the predefined number of high efficiency long training fields to be included within the plurality of sensing transmissions to sense an object moving at at least a threshold speed within a channel of the plurality of sensing transmissions without aliasing.
18 . The system of claim 17 , wherein the threshold speed is 3.0 m/s.
19 . The system of claim 11 , wherein the processor is further configured for detecting the Doppler frequency of motion in the sensing space according to the first plurality of sensing measurements.
20 . The system of claim 11 , wherein the predefined number of high efficiency long training fields is at least two.