Method and device for performing sensing in wireless LAN system
In a wireless local area network (LAN) system, a sensing session may comprise a first burst and a second burst. A transmitting STA may transmit a sensing negotiation frame to a receiving STA. The transmitting STA may transmit a first sensing polling frame, associated with the sensing participation intention of the receiving STA, to the receiving STA in the first burst. The transmitting STA may receive a first response signal, associated with the first sensing polling frame, from the receiving STA in the first burst. The transmitting STA may transmit a first sensing frame to the receiving STA in the first burst. The transmitting STA may transmit a feedback request signal to the receiving STA in the first burst. The transmitting STA may receive a feedback signal from the receiving STA in the first burst.
1 . A method in a wireless local area network (WLAN) system, the method comprising:
transmitting, by an access point (AP) in a first phase, a sensing polling trigger frame to a plurality of stations (STAs);
receiving, by the AP in the first phase, clear to send to self (CTS-to-self) frames from the plurality of STAs,
wherein an interframe space (IFS) between the sensing polling trigger frame and the CTS-to-self frames is a short IFS (SIFS);
transmitting, by the AP in a second phase, a sensing null data packet announcement (NDPA) frame to a first STA related to a sensing measurement report, wherein an IFS between the CTS-to-self frames and the sensing NDPA frame is a SIFS;
transmitting, by the AP in the second phase, a first null data packet (NDP) frame to the first STA,
wherein an IFS between the sensing NDPA frame and the first NDP frame is a SIFS, and
wherein the sensing measurement report is received by the AP from the first STA;
transmitting, by the AP in a third phase, a sensing sounding trigger frame to a second STA; and
receiving, by the AP in the third phase, a second NDP frame from the second STA based on the sensing sounding trigger frame,
wherein an IFS between the sensing sounding trigger frame and the second NDP frame is a SIFS.
2 . The method of claim 1 , wherein the sensing sounding trigger frame is transmitted to a third STA, wherein a third NDP frame is received by the AP from the third STA based on the sensing sounding trigger frame, and wherein the second NDP frame and the third NDP frame are multiplexed in a spatial domain.
3 . An access point (AP) in a wireless local area network (WLAN) system, the AP comprising:
at least one processor; and
at least one computer memory operatively connected to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising:
transmitting, in a first phase, a sensing polling trigger frame to a plurality of stations (STAs);
receiving, in the first phase, clear to send to self (CTS-to-self) frames from the plurality of STAs,
wherein an interframe space (IFS) between the sensing polling trigger frame and the CTS-to-self frames is a short IFS (SIFS);
transmitting, in a second phase, a sensing null data packet announcement (NDPA) frame to a first STA related to a sensing measurement report, wherein an IFS between the CTS-to-self frames and the sensing NDPA frame is a SIFS;
transmitting, in the second phase, a first null data packet (NDP) frame to the first STA,
wherein an IFS between the sensing NDPA frame and the first NDP frame is a SIFS, and
wherein the sensing measurement report is received by the AP from the first STA;
transmitting, in a third phase, a sensing sounding trigger frame to a second STA; and
receiving, in the third phase, a second NDP frame from the second STA based on the sensing sounding trigger frame,
wherein an IFS between the sensing sounding trigger frame and the second NDP frame is a SIFS.
4 . The AP of claim 3 , wherein the sensing sounding trigger frame is transmitted to a third STA, wherein a third NDP frame is received by the AP from the third STA based on the sensing sounding trigger frame, and wherein the second NDP frame and the third NDP frame are multiplexed in a spatial domain.