US-12625251-B2 - Method and apparatus for performing sensing in wireless LAN system

US12625251B2US 12625251 B2US12625251 B2US 12625251B2US-12625251-B2

Abstract

A transmitting STA can transmit a sensing initiation frame to a first receiving STA in a wireless local area network (wireless LAN) system. The sensing initiation frame can include information related to an STA for transmitting a sounding frame and a session identifier (ID) related to an STA group that is to perform sensing. The transmitting STA can transmit the sounding frame to the first receiving STA. The transmitting STA can receive a first feedback frame for the sounding frame from the first receiving STA. The sounding frame can be a frame transmitted to identify a target. The first feedback frame can include information about a channel changed by means of the target. The sounding frame can include a null data packet announcement (NDPA) frame and a null data packet (NDP) frame.

Inventors

Insun JANG
Jeongki Kim
Jinsoo Choi
Dongguk Lim
Sanggook KIM

Assignees

LG ELECTRONICS INC.

Dates

Publication Date: 20260512
Application Date: 20210603

Claims (4)

1 . A method in a wireless local area network (WLAN) system, the method comprising: transmitting, by a sensing initiator, a sensing frame to at least one sensing responder, wherein the sensing frame includes a sensing session identifier (ID) identifying a sensing session to perform sensing, wherein the sensing frame further includes responder information identifying the at least one sensing responder and initiator information identifying the sensing initiator, wherein the sensing frame further includes type information related to a sounding frame which follows the sensing frame, wherein the type information has a first value based on the sensing frame being followed by a null data physical protocol data unit (NDP) frame transmitted by the sensing initiator, wherein the type information has a second value based on the sensing frame being followed by an NDP announcement (NDPA) frame transmitted by the sensing initiator, and the NDPA frame is followed by a null data physical protocol data unit (NDP) frame transmitted by the sensing initiator; transmitting, by the sensing initiator, the sounding frame based on the sensing frame, wherein a type of the sounding frame is determined based on the sensing frame type information; and receiving, by the sensing initiator, a feedback frame based on the sounding frame.
2 . The method of claim 1 , wherein the sensing frame further includes resource allocation information for transmitting the feedback frame.
3 . A sensing initiator in a wireless local area network (WLAN) system, comprising: a transceiver for transmitting and receiving a radio signal; and a processor coupled to the transceiver, the processor is adapted to perform: transmit a sensing frame to at least one sensing responder, wherein the sensing frame includes a sensing session identifier (ID) identifying a sensing session to perform sensing, wherein the sensing frame further includes responder information identifying the at least one sensing responder and initiator information identifying the sensing initiator, wherein the sensing frame further includes type information related to a sounding frame which follows the sensing frame, wherein the type information has a first value based on the sensing frame being followed by a null data physical protocol data unit (NDP) frame transmitted by the sensing initiator, wherein the type information has a second value based on the sensing frame being followed by an NDP announcement (NDPA) frame transmitted by the sensing initiator, and the NDPA frame is followed by a null data physical protocol data unit (NDP) frame transmitted by the sensing initiator; transmit the sounding frame based on the sensing frame, wherein a type of the sounding frame is determined based on the sensing frame type information; and receive a feedback frame based on the sounding frame.
4 . The sensing initiator of claim 3 , wherein the sensing initiation frame further includes resource allocation information for transmitting the feedback frame.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application is the National Stage filing under 35 U.S.C. 371 of International Application No. PCT/KR2021/006958, filed Jun. 3, 2021, which claims the benefit of U.S. Provisional Application No. 63/034,994, filed Jun. 5, 2020, the contents of which are all hereby incorporated by reference herein in their entirety. TECHNICAL FIELD The present specification relates to a sensing technique in a wireless LAN system, and more particularly, to a procedure and a signaling method for performing the sensing. BACKGROUND A wireless local area network (WLAN) has been improved in various ways. For example, IEEE 802.11bf WLAN sensing is the first standard which converges communication and radar technologies. Although there is a rapid increase in a demand for unlicensed frequencies in daily life throughout overall industries, due to a limitation in frequencies to be newly provided, it is very preferable to develop the technology of converging the communication and the radar in terms of increasing frequency utilization efficiency. A sensing technology which detects a movement behind a wall by using a WLAN signal or a radar technology which detects an in-vehicle movement by using a frequency modulated continuous wave (FMCW) signal at a 70 GHz band has been conventionally developed, but it may have significant meaning in that sensing performance can be raised up by one step in association with the IEEE 802.11bf standard. In particular, since privacy protection is increasingly emphasized in modern society, a WLAN sensing technology which is legally freer from invasion of privacy is more expected, unlike CCTV. Meanwhile, an overall radar market throughout automobiles, national defense, industries, daily life, or the like is expected to grow until an average annual growth rate reaches up to a level of about 5% by 2025. In particular, in case of a sensor used in daily life, it is expected to rapidly grow up to a level of 70%. Since the WLAN sensing technology is applicable to a wide range of daily life such as motion detection, breathing monitoring, positioning/tracking, fall detection, in-vehicle infant detection, appearance/proximity recognition, personal identification, body motion recognition, behavior recognition, or the like, it is expected to contribute to enhancing competitiveness of companies. SUMMARY In a wireless local area network (WLAN) system according to various embodiments, a transmitting STA may transmit a sensing initiation frame to a first receiving STA. The sensing initiation frame may include a session identifier (ID) related to an STA group to perform sensing and information related to an STA transmitting a sounding frame. The transmitting STA may transmit the sounding frame to the first receiving STA. The transmitting STA may receive a first feedback frame for the sounding frame from the first receiving STA. The sounding frame may be a frame transmitted to identify a target. The first feedback frame may include information related to a channel changed by the target. The sounding frame may include a null data packet announcement (NDPA) frame and a null data packet (NDP) frame. According to an example of the present specification, WLAN sensing may be performed by selecting STAs to participate in sensing. By defining a frame and a procedure necessary for the WLAN sensing, a specific sensing operation can be prepared. By dividing the sensing initiation frame and the sounding signal for actual sensing, control information required for the sensing and a signal used for actual sensing may be distinguished. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates an example of a transmitting apparatus and/or receiving apparatus of the present specification. FIG. 2 illustrates an example of a WLAN sensing scenario using multiple sensing transmitting apparatuses. FIG. 3 illustrates an example of a WLAN sensing scenario using multiple sensing receiving apparatuses. FIG. 4 illustrates an example of a WLAN sensing procedure. FIG. 5 is an example of classifying WLAN sensing. FIG. 6 illustrates indoor positioning which uses CSI-based WLAN sensing. FIG. 7 is an example of implementing a WLAN sensing apparatus. FIG. 8 briefly illustrates a PPDU structure supported in an 802.11ay WLAN system. FIG. 9 illustrates an example of a PPDU used in the present specification. FIG. 10 illustrates an embodiment of WLAN sensing. FIG. 11 is a diagram illustrating an embodiment of a method for a Sensing initiator to transmit a Sounding frame. FIG. 12 is a diagram illustrating an embodiment of a method for transmitting a feedback frame. FIG. 13 is a diagram illustrating an embodiment of a method for transmitting a feedback frame. FIG. 14 is a diagram illustrating an embodiment of a method for a sensing responder to transmit a sounding frame. FIG. 15 is a diagram illustrating an embodiment of a method for transmitting a sounding frame. FIG. 16 is a diagram illustrating an embodiment of a method for tran