Method and device for performing sensing in wireless LAN system
In a wireless local area network system, a transmission STA may transmit a sensing start frame. The sensing start frame may include information related to the entire band in which WLAN sensing is performed, information related to a reception STA participating in the WLAN sensing, and information related to the number of bands K sensed by each reception STA and the bandwidth of the band sensed by the each reception STA. A transmission STA may transmit a sounding signal to the reception STA. A transmission STA may receive a feedback frame for the sounding signal from the reception STA. The feedback frame may include channel state information for K bands in the order of better channel state among the entire band.
1 . A method performed by a transmitting station (STA) in a wireless local area network (WLAN) system, the method comprising:
transmitting a data unit related to sensing initiation,
wherein the data unit related to sensing initiation includes information related to entire bands in which WLAN sensing is performed, information related to a receiving STA participating in the WLAN sensing, the number K of bands sensed by each receiving STA, and information related to a bandwidth of a band sensed by each receiving STA,
wherein the data unit related to sensing initiation includes a null data packet announcement (NDPA) frame;
transmitting a null data packet (NDP) frame to the receiving STA; and
receiving a feedback frame for the NDP frame from the receiving STA,
wherein the data unit related to sensing initiation further includes information related to a number of transmissions of the NDP frames, and
wherein the feedback frame includes channel state information obtained based on the NDP frame.
2 . The method of claim 1 ,
wherein the data unit related to sensing initiation further includes information related to how many subcarriers a channel state information is measured in units of.
3 . The method of claim 1 ,
wherein the data unit related to sensing initiation further includes band allocation information related to a band in which each receiving STA performs sensing.
4 . The method of claim 1 ,
wherein the feedback frame includes channel state information for K bands in order of good channel states among the entire bands.
5 . The method of claim 1 , wherein the method further comprises,
transmitting, by the transmitting STA, a trigger frame requesting the feedback frame to the receiving STA.
6 . A transmitting station (STA) configured to operate in a wireless local area network (WLAN) system, the transmitting STA comprising:
a transceiver transmitting and receiving a radio signal; and
a processor connected to the transceiver, wherein the processor is adapted to:
transmit a data unit related to sensing initiation,
wherein the data unit related to sensing initiation includes information related to entire bands in which WLAN sensing is performed, information related to a receiving STA participating in the WLAN sensing, the number K of bands sensed by each receiving STA, and information related to a bandwidth of a band sensed by each receiving STA,
wherein the data unit related to sensing initiation includes a null data packet announcement (NDPA) frame;
transmit a null data packet (NDP) frame to the receiving STA; and
receive a feedback frame for the NDP frame from the receiving STA,
wherein the data unit related to sensing initiation further includes information related to a number of transmissions of the NDP frames, and
wherein the feedback frame includes channel state information obtained based on the NDP frame.
7 . The transmitting STA of claim 6 ,
wherein the data unit related to sensing initiation further includes information related to how many subcarriers a channel state information is measured in units of.
8 . The transmitting STA of claim 6 ,
wherein the data unit related to sensing initiation further includes band allocation information related to a band in which each receiving STA performs sensing.
9 . The transmitting STA of claim 7 ,
wherein the feedback frame includes channel state information for K bands in order of good channel states among the entire bands.
10 . The transmitting STA of claim 6 , the processor is further adapted to,
transmit, by the transmitting STA, a trigger frame requesting the feedback frame to the receiving STA.
11 . A method performed by a sensing station (STA) in a wireless local area network (WLAN) system, the method comprising:
receiving a data unit related to sensing initiation from a transmitting STA,
wherein the data unit related to sensing initiation includes information related to entire bands in which WLAN sensing is performed, information related to a receiving STA participating in the WLAN sensing, the number K of bands sensed by each receiving STA, and information related to a bandwidth of a band sensed by each receiving STA,
wherein the data unit related to sensing initiation includes a null data packet announcement (NDPA) frame;
transmitting a null data packet (NDP) frame; and
transmitting a feedback frame for the NDP frame to the transmitting STA,
wherein the data unit related to sensing initiation further includes information related to a number of transmissions of the NDP frames, and
wherein the feedback frame includes channel state information obtained based on the NDP frame.