WO2022060049A1 - Method and device for performing sensing in power saving mode in wireless lan system - Google Patents

Abstract

In a wireless local area network (WLAN) system, a transmitting STA may generate a negotiation frame. The negotiation frame may include information related to a target wake-up time (TWT) service period (SP). The TWT SP may include a first TWT SP for data transmission and WLAN sensing and a second TWT SP used only for WLAN sensing. The transmitting STA may transmit the negotiation frame to a receiving STA. The first TWT SP may include a first time interval for data transmission and a second time interval for WLAN sensing. The information related to the TWT SP may further include period information of the first TWT SP and period information of the second TWT SP. The period of the first TWT SP may be an integer multiple of the second TWT SP.

Description

Method and device for sensing in power saving mode in wireless LAN system

This specification relates to a technique for performing sensing in a wireless LAN system, and more particularly, to a procedure and a signaling method for performing sensing in a power saving mode.

A wireless local area network (WLAN) has been improved in various ways. For example, IEEE 802.11bf wireless LAN sensing is the first standard that converges communications and radar technologies. Although the demand for unlicensed frequencies is rapidly increasing in daily life and industry, there is a limit to the new supply of frequencies. In the past, sensing technology that detects movement behind a wall using a wireless LAN signal or radar technology that detects movement in a vehicle using a Frequency Modulated Continuous Wave (FMCW) signal in a millimeter band (eg, 60 GHz) has been developed. Although it is being developed, it can be of great significance in that it can raise the sensing performance to one level in connection with the IEEE 802.11bf standardization. In particular, as the importance of privacy protection is increasingly emphasized in modern society, the development of wireless LAN sensing technology that is legally free from the issue of privacy infringement is expected more unlike CCTV.

Meanwhile, the overall radar market across automobiles, defense, industry, and life is expected to grow at a CAGR of about 5% by 2025, and in particular, in the case of living sensors, the CAGR is expected to grow rapidly to 70%. . Wireless LAN sensing technology can be applied to a wide range of real life applications such as motion detection, breathing monitoring, positioning/tracking, fall detection, in-vehicle infant detection, appearance/proximity recognition, personal identification, body motion recognition, and behavior recognition, thereby promoting the growth of related new businesses and It is expected to contribute to enhancing the competitiveness of the company.

In a wireless local area network (WLAN) system according to various embodiments, the transmitting STA may generate a negotiation frame. The negotiation frame may include information related to a target wake-up time (TWT) service period (SP). The TWT SP may include a first TWT SP for data transmission and WLAN sensing and a second TWT SP used only for WLAN sensing. The transmitting STA may transmit the negotiation frame to the receiving STA. The first TWT SP may include a first time interval for data transmission and a second time interval for WLAN sensing. The information related to the TWT SP may further include period information of the first TWT SP and period information of the second TWT SP. The period of the first TWT SP may be an integer multiple of the second TWT SP.

As a method for data transmission in power save mode, Target Wake Time (TWT) is defined in IEEE 802.11ax, IEEE 802.11ah, etc. In addition, the definition of additional TWT for sensing is a frequent STA State (“Awake”, “Doze ”), it may be difficult to achieve the desired power save due to conversion.

According to an example of this specification, sensing can be performed in connection with the TWT defined for data transmission. Accordingly, it is possible to obtain a reduction in power loss that can be consumed by WLAN sensing.

1 shows an example of a transmitting apparatus and/or a receiving apparatus of the present specification.

2 shows an example of a wireless LAN sensing scenario using a multi-sensing transmission device.

3 shows an example of a wireless LAN sensing scenario using a multi-sensing receiving device.

4 shows an example of a wireless LAN sensing procedure.

5 is an example of classification of wireless LAN sensing.

6 shows indoor positioning using CSI-based WLAN sensing.

7 is an example of an implementation of a wireless LAN sensing device.

8 is a diagram briefly illustrating a PPDU structure supported by an 802.11ay wireless LAN system.

9 shows a modified example of a transmitting apparatus and/or a receiving apparatus of the present specification.

10 is a diagram illustrating an embodiment of a communication network.

11 is a diagram illustrating an example of a sensing method.

12 is a diagram illustrating an example of a sensing method.

13 is a diagram illustrating an example of a sensing method.

14 is a diagram illustrating an example of a sensing method.

15 is a diagram illustrating an example of a sensing method.

16 is a diagram illustrating an embodiment of a method of operating a transmitting STA.

17 is a diagram illustrating an embodiment of a method of operating a receiving STA.

In this specification, 'A or B (A or B)' may mean 'only A', 'only B', or 'both A and B'. In other words, 'A or B (A or B)' in the present specification may be interpreted as 'A and/or B (A and/or B)'. For example, 'A, B or C(A, B or C)' as used herein means 'only A', 'only B', 'only C', or 'any and any combination of A, B and C ( It may mean any combination of A, B and C).

A slash (/) or a comma (comma) used in this specification may mean 'and/or'. For example, 'A/B' may mean 'A and/or B'. Accordingly, 'A/B' may mean 'only A', 'only B', or 'both A and B'. For example, 'A, B, C' may mean 'A, B, or C'.

In the present specification, 'at least one of A and B' may mean 'only A', 'only B', or 'both A and B'. In addition, in this specification, the expression 'at least one of A or B' or 'at least one of A and/or B' means 'at least one It can be interpreted the same as 'A and B (at least one of A and B)'.

Also, in this specification, 'at least one of A, B and C' means 'only A', 'only B', 'only C', or 'A, B and C' It may mean any combination of A, B and C'. In addition, 'at least one of A, B or C' or 'at least one of A, B and/or C' means It may mean 'at least one of A, B and C'.

In addition, parentheses used in this specification may mean 'for example'. Specifically, when 'control information (EHT-Signal)' is displayed, 'EHT-Signal' may be proposed as an example of 'control information'. In other words, 'control information' of the present specification is not limited to 'EHT-Signal', and 'EHT-Signal' may be proposed as an example of 'control information'. Also, even when displayed as 'control information (ie, EHT-signal)', 'EHT-signal' may be proposed as an example of 'control information'.

In this specification, technical features that are individually described within one drawing may be implemented individually or simultaneously.

The following examples of the present specification may be applied to various wireless communication systems. For example, the following example of the present specification may be applied to a wireless local area network (WLAN) system. For example, the present specification may be applied to the IEEE 802.11a/g/n/ac standard or the IEEE 802.11ax standard. In addition, this specification may be applied to the newly proposed EHT standard or IEEE 802.11be standard. In addition, an example of the present specification may be applied to the EHT standard or a new wireless LAN standard that is an enhancement of IEEE 802.11be. Also, an example of the present specification may be applied to a mobile communication system. For example, it may be applied to a mobile communication system based on Long Term Evolution (LTE) and its evolution based on the 3rd Generation Partnership Project (3GPP) standard. In addition, an example of the present specification may be applied to a communication system of the 5G NR standard based on the 3GPP standard.

Hereinafter, technical features to which the present specification can be applied in order to describe the technical features of the present specification will be described.

1 shows an example of a transmitting apparatus and/or a receiving apparatus of the present specification.

The example of FIG. 1 may perform various technical features described below. 1 relates to at least one STA (station). For example, the STAs 110 and 120 of the present specification are a mobile terminal, a wireless device, a wireless transmit/receive unit (WTRU), a user equipment (UE), It may also be called by various names such as a mobile station (MS), a mobile subscriber unit, or simply a user. The STAs 110 and 120 in the present specification may be referred to by various names such as a network, a base station, a Node-B, an access point (AP), a repeater, a router, and a relay. In the present specification, the STAs 110 and 120 may be referred to by various names such as a receiving device (apparatus), a transmitting device, a receiving STA, a transmitting STA, a receiving device, and a transmitting device.

For example, the STAs 110 and 120 may perform an access point (AP) role or a non-AP role. That is, the STAs 110 and 120 of the present specification may perform AP and/or non-AP functions. In this specification, the AP may also be indicated as an AP STA.

The STAs 110 and 120 of the present specification may support various communication standards other than the IEEE 802.11 standard. For example, a communication standard (eg, LTE, LTE-A, 5G NR standard) according to the 3GPP standard may be supported. In addition, the STA of the present specification may be implemented in various devices such as a mobile phone, a vehicle, and a personal computer. In addition, the STA of the present specification may support communication for various communication services such as voice call, video call, data communication, and autonomous driving (Self-Driving, Autonomous-Driving).

In this specification, the STAs 110 and 120 may include a medium access control (MAC) conforming to the IEEE 802.11 standard and a physical layer interface for a wireless medium.

The STAs 110 and 120 will be described based on the sub-view (a) of FIG. 1 as follows.

The first STA 110 may include a processor 111 , a memory 112 , and a transceiver 113 . The illustrated processor, memory, and transceiver may each be implemented as separate chips, or at least two or more blocks/functions may be implemented through one chip.

The transceiver 113 of the first STA performs a signal transmission/reception operation. Specifically, IEEE 802.11 packets (eg, IEEE 802.11a/b/g/n/ac/ax/be, etc.) may be transmitted/received.

For example, the first STA 110 may perform an intended operation of the AP. For example, the processor 111 of the AP may receive a signal through the transceiver 113 , process the received signal, generate a transmission signal, and perform control for signal transmission. The memory 112 of the AP may store a signal (ie, a received signal) received through the transceiver 113 , and may store a signal to be transmitted through the transceiver (ie, a transmission signal).

For example, the second STA 120 may perform an intended operation of a non-AP STA. For example, the transceiver 123 of the non-AP performs a signal transmission/reception operation. Specifically, IEEE 802.11 packets (eg, IEEE 802.11a/b/g/n/ac/ax/be, etc.) may be transmitted/received.

For example, the processor 121 of the non-AP STA may receive a signal through the transceiver 123 , process the received signal, generate a transmission signal, and perform control for signal transmission. The memory 122 of the non-AP STA may store a signal (ie, a received signal) received through the transceiver 123 and may store a signal to be transmitted through the transceiver (ie, a transmission signal).

For example, an operation of a device indicated as an AP in the following specification may be performed by the first STA 110 or the second STA 120 . For example, when the first STA 110 is an AP, the operation of the device marked as AP is controlled by the processor 111 of the first STA 110 , and is controlled by the processor 111 of the first STA 110 . Relevant signals may be transmitted or received via the controlled transceiver 113 . In addition, control information related to an operation of the AP or a transmission/reception signal of the AP may be stored in the memory 112 of the first STA 110 . In addition, when the second STA 110 is an AP, the operation of the device indicated by the AP is controlled by the processor 121 of the second STA 120 and controlled by the processor 121 of the second STA 120 . A related signal may be transmitted or received via the transceiver 123 that is used. In addition, control information related to an operation of the AP or a transmission/reception signal of the AP may be stored in the memory 122 of the second STA 110 .

For example, an operation of a device indicated as a non-AP (or User-STA) in the following specification may be performed by the first STA 110 or the second STA 120 . For example, when the second STA 120 is a non-AP, the operation of the device marked as non-AP is controlled by the processor 121 of the second STA 120, and the processor ( A related signal may be transmitted or received via the transceiver 123 controlled by 121 . In addition, control information related to the operation of the non-AP or the AP transmit/receive signal may be stored in the memory 122 of the second STA 120 . For example, when the first STA 110 is a non-AP, the operation of the device marked as non-AP is controlled by the processor 111 of the first STA 110 , and the processor ( Related signals may be transmitted or received via transceiver 113 controlled by 111 . In addition, control information related to the operation of the non-AP or the AP transmission/reception signal may be stored in the memory 112 of the first STA 110 .

In the following specification (transmission / reception) STA, first STA, second STA, STA1, STA2, AP, first AP, second AP, AP1, AP2, (transmission / reception) Terminal, (transmission / reception) device , (transmitting/receiving) apparatus, a device called a network, etc. may refer to the STAs 110 and 120 of FIG. 1 . For example, without specific reference numerals (transmitting/receiving) STA, first STA, second STA, STA1, STA2, AP, first AP, second AP, AP1, AP2, (transmitting/receiving) Terminal, (transmitting) A device indicated by a /receiver) device, a (transmit/receive) apparatus, and a network may also refer to the STAs 110 and 120 of FIG. 1 . For example, in the following example, an operation in which various STAs transmit and receive signals (eg, PPDUs) may be performed by the transceivers 113 and 123 of FIG. 1 . In addition, in the following example, the operations of the various STAs generating transmission/reception signals or performing data processing or calculation in advance for the transmission/reception signals may be performed by the processors 111 and 121 of FIG. 1 . For example, an example of an operation of generating a transmission/reception signal or performing data processing or operation in advance for a transmission/reception signal is 1) Determining bit information of a subfield (SIG, STF, LTF, Data) field included in a PPDU /Acquisition/configuration/computation/decoding/encoding operation, 2) time resource or frequency resource (eg, subcarrier resource) used for the subfield (SIG, STF, LTF, Data) field included in the PPDU, etc. operation of determining / configuring / obtaining, 3) a specific sequence (eg, pilot sequence, STF / LTF sequence, SIG) used for the subfield (SIG, STF, LTF, Data) field included in the PPDU operation of determining / configuring / obtaining an extra sequence), etc., 4) a power control operation and / or a power saving operation applied to the STA, 5) an operation related to determination / acquisition / configuration / operation / decoding / encoding of the ACK signal may include In addition, in the following example, various information (eg, field/subfield/control field/parameter/power related information) used by various STAs for determination/acquisition/configuration/computation/decoding/encoding of transmit/receive signals is may be stored in the memories 112 and 122 of FIG. 1 .

The device/STA of the sub-view (a) of FIG. 1 described above may be modified as shown in the sub-view (b) of FIG. 1 . Hereinafter, the STAs 110 and 120 of the present specification will be described based on the sub-drawing (b) of FIG. 1 .

For example, the transceivers 113 and 123 illustrated in (b) of FIG. 1 may perform the same function as the transceivers illustrated in (a) of FIG. 1 . For example, the processing chips 114 and 124 illustrated in (b) of FIG. 1 may include processors 111 and 121 and memories 112 and 122 . The processors 111 and 121 and the memories 112 and 122 illustrated in (b) of FIG. 1 are the processors 111 and 121 and the memories 112 and 122 illustrated in (a) of FIG. ) can perform the same function.

As described below, a mobile terminal, a wireless device, a wireless transmit/receive unit (WTRU), a user equipment (UE), a mobile station (MS), a mobile Mobile Subscriber Unit, user, user STA, network, base station, Node-B, access point (AP), repeater, router, relay, receiving device, transmitting device, receiving STA, transmitting STA, Receiving Device, Transmitting Device, Receiving Apparatus, and/or Transmitting Apparatus means the STAs 110 and 120 shown in the sub-drawings (a)/(b) of FIG. ) may mean the processing chips 114 and 124 shown in FIG. That is, the technical features of the present specification may be performed on the STAs 110 and 120 shown in (a)/(b) of FIG. 1, and the processing chip ( 114 and 124). For example, a technical feature in which a transmitting STA transmits a control signal is that the control signals generated by the processors 111 and 121 shown in the sub-drawings (a)/(b) of FIG. 1 are (a) of FIG. ) / (b) can be understood as a technical feature transmitted through the transceivers 113 and 123 shown in (b). Alternatively, the technical feature in which the transmitting STA transmits the control signal is a technical feature in which a control signal to be transmitted to the transceivers 113 and 123 is generated from the processing chips 114 and 124 shown in the sub-view (b) of FIG. can be understood

For example, the technical feature in which the receiving STA receives the control signal may be understood as the technical feature in which the control signal is received by the transceivers 113 and 123 shown in the sub-drawing (a) of FIG. 1 . Alternatively, the technical feature that the receiving STA receives the control signal is that the control signal received by the transceivers 113 and 123 shown in the sub-drawing (a) of FIG. 1 is the processor shown in (a) of FIG. 111, 121) can be understood as a technical feature obtained by. Alternatively, the technical feature for the receiving STA to receive the control signal is that the control signal received by the transceivers 113 and 123 shown in the sub-view (b) of FIG. 1 is the processing chip shown in the sub-view (b) of FIG. It can be understood as a technical feature obtained by (114, 124).

Referring to (b) of FIG. 1 , software codes 115 and 125 may be included in the memories 112 and 122 . The software codes 115 and 125 may include instructions for controlling the operations of the processors 111 and 121 . Software code 115, 125 may be included in a variety of programming languages.

The processors 111 and 121 or the processing chips 114 and 124 shown in FIG. 1 may include an application-specific integrated circuit (ASIC), other chipsets, logic circuits, and/or data processing devices. The processor may be an application processor (AP). For example, the processors 111 and 121 or the processing chips 114 and 124 shown in FIG. 1 may include a digital signal processor (DSP), a central processing unit (CPU), a graphics processing unit (GPU), and a modem (Modem). and demodulator). For example, the processors 111, 121 or processing chips 114, 124 shown in FIG. 1 are SNAPDRAGON ^TM series processors manufactured by Qualcomm®, EXYNOS ^TM series processors manufactured by Samsung®, and Apple® It may be an A series processor manufactured by MediaTek®, a HELIO ^TM series processor manufactured by MediaTek®, an ATOM ^TM series processor manufactured by INTEL®, or an enhanced processor.

In this specification, uplink may mean a link for communication from a non-AP STA to an AP STA, and an uplink PPDU/packet/signal may be transmitted through the uplink. In addition, in this specification, downlink may mean a link for communication from an AP STA to a non-AP STA, and a downlink PPDU/packet/signal may be transmitted through the downlink.

Although the wireless LAN sensing technology is a kind of radar technology that can be implemented without a standard, it is judged that stronger performance can be obtained through standardization. The IEEE 802.11bf standard defines devices participating in wireless LAN sensing by function as shown in the table below. According to its function, it can be divided into a device that initiates wireless LAN sensing and a device that participates, and a device that transmits and receives a sensing PPDU (Physical Layer Protocol Data Unit).

Terms	function
Sensing Initiator	device that initiates sensing
Sensing Responder	Devices participating in sensing
Sensing Transmitter	A device that transmits a sensing PPDU
Sensing Receiver	A device that receives a sensing PPDU

Also, in the present invention, if the subject of signal transmission for wireless LAN sensing is an initiator, it is defined as initiator-based sensing, and if the subject of signal transmission is a responder, it is defined as responder-based sensing. 2 shows an example of a wireless LAN sensing scenario using a multi-sensing receiving device. 3 shows an example of a wireless LAN sensing scenario using a multi-sensing transmission device. 2 and 3 show sensing scenarios according to the function and arrangement of the wireless LAN sensing device. In an environment assuming one sensing start device and multiple sensing participating devices, FIG. 2 is a scenario using multiple sensing PPDU receiving devices, and FIG. 3 is a method for feeding back sensing results using a transmitting device after receiving multiple sensing PPDUs. it's a scenario Assuming that the sensing PPDU receiving device includes the sensing measurement signal processing device, in the case of FIG. 3 , a procedure for transmitting (feedback) the sensing measurement result to the sensing start device STA 5 is additionally required. 4 shows an example of a wireless LAN sensing procedure. Looking at the procedure of wireless LAN sensing, discovery, negotiation, measurement exchange, and tear down are performed between the wireless LAN sensing start device and the participating device. Discovery is a process of identifying the sensing capabilities of WLAN devices, negotiation is a process of determining a sensing parameter between a sensing start device and a participating device, measurement value exchange is a process of transmitting a sensing PPDU and transmitting a sensing measurement result, and connection Release is the process of terminating the sensing procedure. In the case of responder-based sensing, the process of transmitting the sensing measurement result may be omitted.

5 is an example of classification of wireless LAN sensing.

Wireless LAN sensing can be classified into CSI-based sensing, which uses channel state information of a signal that arrives at the receiver through a channel, from the transmitter, and radar-based sensing, which uses a signal received after a transmitted signal is reflected by an object. there is. In addition, each sensing technology includes a method in which a sensing transmitter directly participates in the sensing process (coordinated CSI, active radar) and a method in which the sensing transmitter does not participate in the sensing process, that is, there is no dedicated transmitter participating in the sensing process (un -coordinated CSI, passive radar).

6 shows indoor positioning using CSI-based WLAN sensing.

6 is a diagram that utilizes CSI-based wireless LAN sensing for indoor positioning. By using CSI to obtain an angle of arrival and a time of arrival, and converting these into orthogonal coordinates, indoor positioning information can be obtained. .

7 is an example of an implementation of a wireless LAN sensing device.

FIG. 7 shows a wireless LAN sensing device implemented by using the MATLAB toolbox, Zynq, and USRP. In the MATLAB toolbox, an IEEE 802.11ax wireless LAN signal is generated, and an RF signal is generated using Zynq Software Defined Radio (SDR). The signal passing through the channel is received by USRP SDR and sensing signal processing is performed in the MATLAB toolbox. Here, one reference channel (a channel directly receivable from the sensing transmitter) and one surveillance channel (a channel receivable by reflection from an object) are assumed. As a result of analysis using a wireless LAN sensing device, a unique characteristic that can distinguish movement or body movement was obtained.

Currently, IEEE 802.11bf wireless LAN sensing standardization is in the early development stage, and cooperative sensing technology to improve sensing accuracy is expected to be treated as important in the future. It is expected that standardization core topics include synchronization technology of sensing signals for cooperative sensing, CSI management and use technology, sensing parameter negotiation and sharing technology, and scheduling technology for CSI generation. In addition, long-distance sensing technology, low-power sensing technology, sensing security and privacy protection technology will also be considered as major agenda items.

IEEE 802.11bf wireless LAN sensing is a kind of radar technology that uses a wireless LAN signal that is commonly present anywhere at any time. The table below shows typical IEEE 802.11bf use cases, which can be used in a wide range of real-life situations, such as indoor sensing, motion recognition, health care, 3D vision, and in-vehicle sensing. Because it is mainly used indoors, the operating range is usually within 10 to 20 meters, and the maximum error of distance does not exceed 2 meters.

Name	details	Max range (m)	Key Performance Indicator	Range Accuracy (m)	Max Velocity (m/s)/Velocity Accuracy	angular Accuracy (deg)
Room Sensing	presence detection, counting the number of people in the room	15	Number of Persons in Room	0.5-2	2/0.1
Smart meeting room	presence detection, counting the number of people in the room, localization of active people	10	Location of persons in room	0.5-2	1/0.1-0.3
Motion detection in a room	Detection of motion of in a room (of Human)	10
home security	Detection of presence of intruders in a home	10	Detection of a person in a room	0.5-2	3/0.1-0.3	medium
Audio with user tracking	Tracking persons in a room and pointing the sound of an audio system at those people	6	Localization of persons to within 0.2m	0.2	0.5/0.05	3
Store Sensing	Counting number of people in a store, their location, speed of movement. Accuracy less important	20	Number and location of persons in store	0.5-2	1/0.1-0.3	3
Home Appliance Control	Tracking person and motion/ gesture detection	10	Gesture Detection	<1
Gesture recognition - short range (finger movement)	Identification of a gesture from a set of gestures - range < 0.5m	0.5	Gesture Detection		7	3
Gesture recognition - medium range (hand movement)	Indentification of a gesture from a set of gestures - range > 0.5m	2	Gesture Detection
Gesture recognition - large range (full body movement)	Indentification of a gesture from a set of gestures - range > 2m	7	Gesture Detection	0.2	2/0.1	5
Aliveliness detection	Determination whether a close by object is alive or not	One	Aliveliness Detection	0.05
Face/Body Recognition	Selection of the identity of a person from a set of known persons	One	Identity detection	0.02
Proximity Detection	Detection of object in close proximity of device	0.5	Object Detection	0.02-2	1.5/0.2	none
Home Appliance Control		Gesture Detection	3	Gesture Detection	<1	3/0.1
health care - Fall detection	Fall detection - abnormal position detection	10		0.2	3/0.1
Health case - remote diagnostics	measurements of breathing rate, heart rate etc.	5	Breating rate accuracy/Pulse Accuracy	0.5	2/0.1
Surveillance/Monitoring of elder people and/or children	Tracking person and presence detection	10	Detection and localization of person	0.2-2	3/0.1
Sneeze sensing	Detecting and localizing the target human and sneeze droplet volume	10	Detection and localization of person and sneeze droplet volume	0.2-0.5	20/0.1
3d vision	building a 3d picture of an environment, using multiple STAs	10	accuracy of 3d map (range, angle)	0.01	5/0.1	2
In car sensing - detection	detection of humans in car	5	Presence of Human in car	0.1	1/0.1	3
In car sensing	Driver sleepiness detection/detection aid	3	Fast detection of driver sleepiness	0.01	1/0.1	3

In IEEE 802.11, a technology for sensing the motion or gesture of an object (person or thing) using a wi-fi signal of 60 GHz (eg, 802.11ad or 802.11ay signal) is being discussed. In this specification, a method of configuring a frame format used for wi-fi sensing and a wi-fi sensing sequence are proposed. 8 is a diagram briefly illustrating a PPDU structure supported by an 802.11ay wireless LAN system. As shown in Figure 8, the PPDU format applicable to the 802.11ay system is L-STF, L-CEF, L-Header, EDMG-Header-A, EDMG-STF, EDMG-CEF, EDMG-Header-B, Data , TRN field, and the fields may be selectively included according to the type of PPDU (eg, SU PPDU, MU PPDU, etc.). Here, a portion including the L-STF, L-CEF, and L-Header fields may be referred to as a non-EDMG portion, and the remaining portion may be referred to as an EDMG area. In addition, the L-STF, L-CEF, L-Header, and EDMG-Header-A fields may be named pre-EDMG modulated fields, and the remaining parts may be named EDMG modulated fields. The EDMG-Header-A field includes information required to demodulate an EDMG PPDU. The definition of the EDMG-Header-A field is the same as that of the EDMG SC mode PPDU and the EDMG OFDM mode PPDU, but is different from the definition of the EDMG control mode PPDU. The structure of the EDMG-STF depends on the number of consecutive 2.16 GHz channels through which the EDMG PPDU is transmitted and the index i _STS of the i _STS -th space-time stream. For single space-time stream EDMG PPDU transmission using EDMG SC mode through one 2.16 GHz channel, the EDMG-STF field does not exist. For EDMG SC transmission, the EDMG-STF field shall be modulated using pi/2 BPSK.

The structure of the EDMG-CEF depends on the number of consecutive 2.16GHz channels through which the EDMG PPDU is transmitted and the number of space-time streams i _STSs . For single space-time stream EDMG PPDU transmission using EDMG SC mode through one 2.16 GHz channel, the EDMG-CEF field does not exist. For EDMG SC transmission, the EDMG-CEF field should be modulated using pi/2 BPSK.

The (legacy) preamble portion of the PPDU as described above includes packet detection, automatic gain control (AGC), frequency offset estimation, synchronization, modulation (SC or OFDM) indication and channel measurement. (channel estimation) can be used. The format of the preamble may be common for OFDM packet and SC packet. In this case, the preamble may include a Short Training Field (STF) and a Channel Estimation (CE) field located after the STF field.

9 shows a modified example of a transmitting apparatus and/or a receiving apparatus of the present specification.

Each device/STA of the sub-drawings (a)/(b) of FIG. 1 may be modified as shown in FIG. 9 . The transceiver 930 of FIG. 9 may be the same as the transceivers 113 and 123 of FIG. 9 . The transceiver 930 of FIG. 9 may include a receiver and a transmitter.

The processor 910 of FIG. 9 may be the same as the processors 111 and 121 of FIG. 1 . Alternatively, the processor 910 of FIG. 9 may be the same as the processing chips 114 and 124 of FIG. 1 .

The memory 150 of FIG. 9 may be the same as the memories 112 and 122 of FIG. 1 . Alternatively, the memory 150 of FIG. 9 may be a separate external memory different from the memories 112 and 122 of FIG. 1 .

Referring to FIG. 9 , the power management module 911 manages power for the processor 910 and/or the transceiver 930 . The battery 912 supplies power to the power management module 911 . The display 913 outputs the result processed by the processor 910 . Keypad 914 receives input to be used by processor 910 . A keypad 914 may be displayed on the display 913 . SIM card 915 may be an integrated circuit used to securely store an international mobile subscriber identity (IMSI) used to identify and authenticate subscribers in mobile phone devices, such as mobile phones and computers, and keys associated therewith. .

Referring to FIG. 9 , the speaker 940 may output a sound related result processed by the processor 910 . Microphone 941 may receive sound related input to be used by processor 910 .

IEEE802.11bf considers the signal transmission/reception methods of 802.11ad and 802.11ay, which are 60GHz Wi-Fi technologies, in order to sense a motion or gesture of an STA or a person using a 60GHz Wi-Fi signal. In this specification, for efficient Wi-Fi sensing, a sensing start frame, a transmission start frame, and a method for configuring a sensing signal for channel estimation between an AP and an STA or an STA and an STA. A sensing start frame, a transmission start frame, and a sensing signal We propose a sensing sequence that transmits and receives .

The STA described below may be the apparatus of FIGS. 1 and/or 9 , and the PPDU may be the PPDU of FIG. 7 . A device may be an AP or a non-AP STA.

WLAN (Wireless Local Area Network) was introduced for the purpose of short-distance data transmission using an unlicensed band. IEEE 802.11 MAC/PHY-based WLAN (eg, Wi-Fi) has become such a representative technology that it is now deployed almost everywhere.

Although WLAN (eg, Wi-Fi) is designed for data signal transmission, its use has recently been expanded for purposes other than data transmission.

A WLAN (eg, Wi-Fi) signal transmitted from the transmitter to the receiver may include information on a transmission channel environment between the two transmitters and receivers. WLAN sensing refers to a technology for obtaining cognitive information about various surrounding environments by processing information about a transmission channel environment acquired through a WLAN signal.

For example, cognitive information includes gesture recognition, fall detection by elder people, intrusion detection, human motion detection, health monitoring, It may include information obtained through a technology such as pet movement detection.

Additional services may be provided through cognitive information, and WLAN sensing may be applied and used in various forms in real life. As a method for increasing the accuracy of WLAN sensing, devices having one or more WLAN sensing functions may be used for WLAN sensing. WLAN sensing using a plurality of devices can use multiple pieces of information about the channel environment compared to a method using a single device (ie, a transceiver end), so more accurate sensing information can be obtained.

The Target Wake Time (TWT) method is proposed to IEEE 802.11ah and IEEE 802.11ax as a method to obtain power reduction by switching the STA to the awake state only for a set time for data transmission and maintaining the doze state at other times. It is a technology that has been adopted. In WLAN sensing operation, power consumption reduction can be obtained in a similar way.

The present invention proposes a method capable of reducing power consumption during WLAN sensing. In particular, we propose a method to prevent power consumption that may be caused by frequent switching to the awake state during individual TWT operations of data transmission and sensing through the TWT method designed for data transmission and operation in conjunction with the operation.

Sensing Session : A period for transmitting and receiving signals for sensing. The sensing session may be allocated periodically or as needed. A sensing session may consist of a number of sub-sessions. In this specification, a sub-session may be referred to as a “sensing burst”.

WLAN Sensing Initiator : A STA (station) that instructs devices having one or more sensing functions (ie, a WLAN Sensing responder) to initiate a sensing session using a WLAN signal. The WLAN sensing initiator may transmit a signal (eg, NDP) for sensing, and may request other STAs to transmit a signal for sensing. That is, the initiator can be either a transmitter or a receiver.

WLAN Sensing Responder : An STA capable of participating in WLAN sensing under the instruction of the WLAN sensing initiator and performing the indicated sensing, transmitting a signal to the initiator, or transmitting a signal for sensing under the instruction of the initiator.

WLAN Sensing Transmitter : STA that transmits a signal for WLAN sensing during a sensing session (or burst). When a sensing session consists of multiple sensing bursts, the sensing transmitter may be the same for all bursts, different for some bursts, or different for every burst.

WLAN Sensing Receiver : STA that receives a signal for WLAN sensing during a sensing session (or burst). When a sensing session consists of multiple sensing bursts, the sensing receiver may be the same for all bursts, different for some bursts, or different for every burst.

In the sensing session, the WLAN initiator may play the role of a WLAN sensing transmitter (“initiator-based sensing”) or a WLAN sensing receiver (“responder-based sensing”).

In the sensing session, the WLAN responder may perform the role of the WLAN sensing transmitter (“responder-based sensing”) or the role of the WLAN sensing receiver (“initiator-based sensing”).

TWT Requesting (initiating) STA: A STA that requests a TWT agreement for data transmission from another STA.

TWT Responding STA: STA that has received a TWT agreement request for data transmission from another STA.

The TWT Requesting STA may act as an initiator or responder in WLAN sensing, and may play a role as a sensing transmitter or receiver depending on whether a sensing measurement signal is transmitted.

The TWT Responding STA can act as an initiator or responder in WLAN sensing, and can play a role as a sensing transmitter or receiver depending on whether a sensing measurement signal is transmitted.

10 is a diagram illustrating an embodiment of a communication network.

Referring to FIG. 10 , STA1 and STA2 may operate as TWT Requesting STAs or TWT Responding STAs. STA1 and STA2 may exchange data and perform sensing.

Case 1: When the TWT Period defined for data transmission is shorter than or equal to the Period for supporting the sensing application.

- Some or all of the TWT service period (SP) defined for data transmission is used in connection with the TWT operation for sensing.

The TWT Period defined for data transmission may mean a period during which data transmission is performed, and the TWT Period for supporting a sensing application may mean a period during which sensing is performed.

Indication that TWT for sensing can be supported in connection with TWT for data transmission is provided in addition to existing information (eg, TWT element, field, subfield, Capability element, Operation element, Extended Capability element, etc.), or newly It may be provided as defined information (eg, New element, field, subfield, etc.).

In the TWT Negotiation process for data transmission in Power Save Mode, the TWT Initiating STA and the TWT Responding STA may proceed with the TWT Negotiation process for supporting sensing.

In addition to the TWT negotiation process for data transmission in Power Save Mode, the TWT initiating STA and the TWT responding STA may separately perform the TWT negotiation process for supporting sensing.

In the negotiation process, the period and duration of TWT for sensing support can be defined.

Individual TWT:

The TWT SP used in conjunction may consist of two parts. For example, one may be configured as a TWT part for supporting data transmission, and the other may be configured as a TWT part for supporting sensing.

The TWT part for data transmission may be temporally located first in the TWT SP, and the TWT part for supporting sensing may be located first.

The TWT Requesting STA may act as a Sensing Initiator or a Sensing Responder in the Sensing TWT part. The TWT Requesting STA may transmit a signal for sensing (Sensing Transmitter) or receive (Sensing Receiver) while serving as a sensing initiator or sensing responder.

The TWT Responding STA may act as a Sensing Initiator or a Sensing Responder in the Sensing TWT part. The TWT Responding STA may transmit (Sensing Transmitter) or receive (Sensing Receiver) signals for sensing while acting as a sensing initiator or sensing responder.

TWT-related information for sensing (eg, duration, period, etc.) is additionally provided to the existing data TWT information (eg, TWT element, field, subfield, etc.), or new information (eg, New TWT element) , field, subfield, etc.).

For example, when the TWT for sensing is located behind, the duration field of the existing TWT element indicates the TWT duration for data transmission and sensing, and may additionally inform the start time of the TWT for sensing.

The TWT operation for sensing may be started with an exchange of a control frame (eg, RTS-CTS exchange) in order to secure a stable channel.

This exchange of control frames may proceed after a predetermined time (eg, short inter-frame space (SIFS)) after the TWT duration for data transmission ends. After the TWT duration for data transmission ends and after a certain time (eg, SIFS), the operation of the TWT for sensing may start with transmission of a trigger frame.

Resources (time, frequency, and/or spatial resources, etc.) used during TWT duration for data transmission may be the same as or different from Resources used during TWT duration for sensing.

When the TWT agreement established for data transmission is teared down, the TWT agreement for sensing can be teared down or maintained.

When the TWT agreement for sensing tears down, the STA can perform sensing through channel access or negotiate a TWT agreement for new sensing.

11 is a diagram illustrating an example of a sensing method.

Referring to FIG. 11 , TWT negotiation for data transmission and TWT negotiation for sensing may be performed together. The TWT SP (service period) may be composed of two parts. One is for data communication and the other is for sensing. For example, in FIG. 11 , a TWT part for supporting data communication is located first. However, the TWT part for supporting data communication may be located at the rear. For example, in the TWT negotiation process, TWT negotiation for sensing may be performed.

12 is a diagram illustrating an example of a sensing method.

12, TWT negotiation for data transmission and TWT negotiation for sensing may be separately performed. TWT SP where TWT for data transmission and sensing overlap can be composed of 2 parts. One is for data communication and the other is for sensing.

In FIG. 12 , the TWT part for supporting data communication is located first in the TWT SP where the TWT for data transmission and sensing overlap. However, the TWT part for supporting data communication may be located at the rear. For example, in the TWT negotiation process, TWT negotiation for sensing may be performed.

Case 2: When the TWT Period defined for data transmission is longer than the Period to support the sensing application.

- Define TWT to support sensing. The TWT period for data transmission can be an integer multiple of the TWT period for sensing. In this case, TWT for data transmission and sensing can overlap regularly on the time axis.

In connection with TWT for data transmission, an indication that TWT for sensing can be supported is additionally provided to existing information (eg, TWT element, field, subfield, Capability element, Operation element, Extended Capability element, etc.), or newly It can be provided as defined information (eg, New element, field, subfield, etc.).

In the TWT negotiation process for data transmission in Power Save Mode, the TWT initiating STA and the TWT responding STA may perform the TWT negotiation process to support sensing.

The TWT initiating STA and the TWT responding STA may separately perform the TWT negotiation process for supporting sensing in addition to the TWT negotiation process for data transmission in Power Save Mode.

The TWT initiating STA and the TWT responding STA may define the period and duration of the TWT for sensing support in the negotiation process.

Individual TWT:

The TWT duration for sensing used in the non-overlapping part on the time axis may be the same as or different from the TWT duration used in the overlapping part.

The TWT SP used in overlapping may be composed of two parts. For example, one may be configured as a TWT part for supporting data transmission, and the other may be configured as a TWT part for supporting sensing.

The TWT part for supporting data communication may be located first in the TWT service period (SP), and the TWT part for supporting sensing may be located first.

The TWT Requesting STA may act as a Sensing Initiator or a Sensing Responder in the Sensing TWT part. The TWT Requesting STA may transmit a signal for sensing (Sensing Transmitter) or receive (Sensing Receiver) while serving as a sensing initiator or sensing responder.

The TWT Responding STA may act as a Sensing Initiator or a Sensing Responder in the Sensing TWT part. The TWT Responding STA may transmit (Sensing Transmitter) or receive (Sensing Receiver) signals for sensing while acting as a sensing initiator or sensing responder.

TWT-related information for sensing (eg, duration, period, etc.) is additionally provided to the existing data TWT information (eg, TWT element, field, subfield, etc.), or new information (eg, New TWT element) , field, subfield, etc.).

For example, in the case of a linked TWT SP, when the TWT for sensing is located behind, the duration field of the existing TWT element represents the sum of the TWT durations for data transmission and sensing, and is related to the start time of the TWT for sensing. Additional information may be included. The period of TWT for sensing and TWT for data transmission may have an integer multiple relationship.

The TWT operation for sensing may be started with an exchange of a control frame (eg, RTS-CTS exchange) in order to secure a stable channel.

This exchange of control frames may proceed after a predetermined time (eg, short inter-frame space (SIFS)) after the TWT duration for data transmission ends. After the TWT duration for data transmission ends and after a certain time (eg, SIFS), the operation of the TWT for sensing may start with transmission of a trigger frame.

Resources (time, frequency, and/or spatial resources, etc.) used during TWT duration for data transmission may be the same as or different from Resources used during TWT duration for sensing.

13 is a diagram illustrating an example of a sensing method.

Referring to FIG. 13 , the TWT SP in which the TWT for data transmission and sensing overlap may be composed of two parts. For example, one of the two parts of the TWT SP where the TWT for data transmission and sensing overlaps may be a part for data communication, and the other part may be a part for sensing. In FIG. 13 , the TWT part for supporting data communication is located first, but the TWT part for supporting data communication may be located later. For example, in the TWT negotiation process for data transmission, TWT negotiation for sensing may be performed. That is, TWT negotiation for data transmission and sensing may be performed together.

For example, the TWT period for data transmission may be twice the TWT period for sensing. That is, while sensing is performed twice, data transmission may be performed once. For example, the TWT SP after the TWT SP for sensing may be a TWT SP for both data transmission and sensing. For example, if data transmission is performed once while sensing is performed n times, the TWT SP for sensing may be repeated n-1 times, and then the TWT for 1 time may be a TWT for both data transmission and sensing.

14 is a diagram illustrating an example of a sensing method.

Referring to FIG. 14 , the TWT SP in which the TWT for data transmission and sensing overlap may be composed of two parts. For example, one of the two parts of the TWT SP where the TWT for data transmission and sensing overlaps may be a part for data communication, and the other part may be a part for sensing. In FIG. 14 , the TWT part for supporting data communication is located first, but the TWT part for supporting data communication may be located later. In addition to TWT negotiation for data transmission, TWT negotiation for additional sensing may be performed. TWT negotiation for data transmission and TWT negotiation for sensing may be separately performed.

For example, the TWT period for data transmission may be twice the TWT period for sensing. That is, while sensing is performed twice, data transmission may be performed once. For example, the TWT SP after the TWT SP for sensing may be a TWT SP for both data transmission and sensing. For example, if data transmission is performed once while sensing is performed n times, the TWT SP for sensing may be repeated n-1 times, and then the TWT for 1 time may be a TWT for both data transmission and sensing.

Broadcast TWT:

STAs scheduled for broadcast TWT by the AP may support sensing in conjunction with the TWT SP defined for data transmission.

Indication that TWT for sensing can be supported in connection with Broadcast TWT for data transmission is provided in addition to existing information (eg, TWT element, field, subfield, Capability element, Operation element, Extended Capability element, etc.), It may be provided as newly defined information (eg, New element, field, subfield, etc.).

Broadcast TWT SP used in conjunction may consist of two parts. One may be a TWT part for supporting data transmission (“Broadcast TWT”), and the other may be a TWT part for supporting sensing (“Sensing TWT”).

In the broadcast TWT SP used in association, the TWT part for data transmission may be located first in the TWT SP, and the TWT part for supporting sensing may be located first.

A Broadcast TWT Responding STA may act as a Sensing Initiator or a Sensing Responder in the Sensing TWT part. It can transmit (Sensing Transmitter) or receive (Sensing Receiver) signals for sensing while acting as a Sensing Initiator or Sensing Responder.

All or some of the STAs performing data transmission (transmission/reception) during the broadcast TWT SP can perform sensing during the TWT SP defined for sensing. STAs that do not participate in sensing may switch to the Doze state after the TWT SP for data transmission is terminated.

TWT-related information for sensing (eg, duration, period, etc.) is provided in addition to the existing data TWT information (TWT element, field, subfield, etc.) or provided as new information (New TWT element, field, subfield, etc.) can be

For example, when the TWT for sensing is located behind, the duration field of the existing TWT element indicates the TWT duration for data transmission and sensing, and may additionally inform the start time of the TWT for sensing.

The TWT operation for sensing may start with an exchange of a control frame (eg, RTS-CTS exchange) to secure a stable channel. When multiple STAs participate in sensing, it can start with an exchange of a control frame (eg, MU-RTS-CTS exchange) to secure a stable channel.

This exchange of control frames may be performed after a predetermined time (eg, short inter-frame space (SIFS)) after the broadcast TWT duration for data transmission ends.

After the broadcast TWT duration for data transmission ends and after a certain time (eg, SIFS), the operation of the TWT for sensing may be started by transmission of a trigger frame.

Resources (eg, time, frequency, and/or spatial resources, etc.) used during the Broadcast TWT duration for data transmission may be the same as or different from Resources used during the TWT duration for sensing.

15 is a diagram illustrating an example of a sensing method.

Referring to FIG. 15 , the TWT SP in which the TWT for data transmission and sensing overlap may be composed of two parts. For example, one of the two parts of the TWT SP where the TWT for data transmission and sensing overlaps may be a part for data communication, and the other part may be a part for sensing. In FIG. 14 , the TWT part for supporting data communication is located first, but the TWT part for supporting data communication may be located later.

As a method for data transmission in power save mode, Target Wake Time (TWT) is defined in IEEE 802.11ax, IEEE 802.11ah, etc. In addition, the definition of additional TWT for sensing is a frequent STA State (“Awake”, “Doze ”), it may be difficult to achieve the desired power save due to conversion.

According to an example of this specification, sensing can be performed in connection with the TWT defined for data transmission. Accordingly, it is possible to obtain a reduction in power loss that can be consumed by WLAN sensing.

16 is a diagram illustrating an embodiment of a method of operating a transmitting STA.

Referring to FIG. 16 , an operation of a transmitting STA may be based on technical features described in at least one of FIGS. 1 to 15 .

The transmitting STA may generate a negotiation frame (S1610). For example, the negotiation frame may include information related to a target wake-up time (TWT) service period (SP). For example, the TWT SP may include a first TWT SP for data transmission and WLAN sensing and a second TWT SP used only for WLAN sensing.

For example, the first TWT SP may include a first time interval for data transmission and a second time interval for WLAN sensing.

For example, the information related to the TWT SP may further include period information of the first TWT SP and period information of the second TWT SP.

For example, the period of the first TWT SP may be an integer multiple of the second TWT SP.

For example, the negotiation frame may further include capability information related to whether the transmitting STA can use the TWT SP for the WLAN sensing.

For example, the information related to the TWT SP may further include information related to the duration of the TWT SP.

The transmitting STA may transmit a negotiation frame (S1620). For example, the transmitting STA may transmit the negotiation frame to the receiving STA.

17 is a diagram illustrating an embodiment of a method of operating a receiving STA.

Referring to FIG. 17 , an operation of a receiving STA may be based on technical features described in at least one of FIGS. 1 to 15 .

The receiving STA may receive a negotiation frame (S1710). For example, a negotiation frame may be received from the transmitting STA. For example, the negotiation frame may include information related to a target wake-up time (TWT) service period (SP). For example, the TWT SP may include a first TWT SP for data transmission and WLAN sensing and a second TWT SP used only for WLAN sensing.

For example, the first TWT SP may include a first time interval for data transmission and a second time interval for WLAN sensing.

For example, the information related to the TWT SP may further include period information of the first TWT SP and period information of the second TWT SP.

For example, the period of the first TWT SP may be an integer multiple of the second TWT SP.

For example, the negotiation frame may further include capability information related to whether the transmitting STA can use the TWT SP for the WLAN sensing.

For example, the information related to the TWT SP may further include information related to the duration of the TWT SP.

The transmitting STA and the receiving STA may decode the negotiation frame (S1720).

Some of the detailed steps shown in the examples of FIGS. 16 and 17 may not be essential steps and may be omitted. In addition to the steps shown in FIGS. 16 and 17 , other steps may be added, and the order of the steps may vary. Some of the above steps may have their own technical meaning.

The technical features of the present specification described above may be applied to various devices and methods. For example, the above-described technical features of the present specification may be performed/supported through the apparatus of FIGS. 1 and/or 9 . For example, the technical features of the present specification described above may be applied only to a part of FIGS. 1 and/or 9 . For example, the technical features of the present specification described above are implemented based on the processing chips 114 and 124 of FIG. 1 , or implemented based on the processors 111 and 121 and the memories 112 and 122 of FIG. 1 , or , may be implemented based on the processor 910 and the memory 920 of FIG. 9 . For example, in the apparatus of the present specification, the apparatus includes: a memory; and a processor operatively coupled to the memory, wherein the processor generates a negotiation frame, wherein the negotiation frame includes information related to a target wake-up time (TWT) service period (SP). wherein the TWT SP includes a first TWT SP for data transmission and WLAN sensing and a second TWT SP used only for WLAN sensing; And it may be configured to transmit the negotiation frame to the receiving STA.

The technical features of the present specification may be implemented based on a CRM (computer readable medium). For example, CRM proposed by the present specification includes an instruction based on being executed by at least one processor of a transmitting STA (station) of a wireless local area network (Wireless Local Area Network) system. In at least one computer readable medium, a negotiation frame is generated, wherein the negotiation frame includes information related to a target wake-up time (TWT) and a service period (SP), , wherein the TWT SP includes a first TWT SP for data transmission and WLAN sensing and a second TWT SP used only for WLAN sensing; and an instruction for performing an operation including transmitting the negotiation frame to the receiving STA.

The instructions stored in the CRM of the present specification may be executed by at least one processor. At least one processor related to CRM in the present specification may be the processors 111 and 121 or the processing chips 114 and 124 of FIG. 1 , or the processor 910 of FIG. 9 . Meanwhile, the CRM of the present specification may be the memories 112 and 122 of FIG. 1 , the memory 920 of FIG. 9 , or a separate external memory/storage medium/disk.

The technical features of the present specification described above are applicable to various applications or business models. For example, the above-described technical features may be applied for wireless communication in a device supporting artificial intelligence (AI).

Artificial intelligence refers to a field that studies artificial intelligence or methodologies that can create it, and machine learning refers to a field that defines various problems dealt with in the field of artificial intelligence and studies methodologies to solve them. do. Machine learning is also defined as an algorithm that improves the performance of a certain task through constant experience.

An artificial neural network (ANN) is a model used in machine learning, and may refer to an overall model having problem-solving ability, which is composed of artificial neurons (nodes) that form a network by combining synapses. An artificial neural network may be defined by a connection pattern between neurons of different layers, a learning process that updates model parameters, and an activation function that generates an output value.

The artificial neural network may include an input layer, an output layer, and optionally one or more hidden layers. Each layer includes one or more neurons, and the artificial neural network may include neurons and synapses connecting neurons. In the artificial neural network, each neuron may output a function value of an activation function for input signals, weights, and biases input through synapses.

Model parameters refer to parameters determined through learning, and include the weight of synaptic connections and the bias of neurons. In addition, the hyperparameter refers to a parameter that must be set before learning in a machine learning algorithm, and includes a learning rate, the number of iterations, a mini-batch size, an initialization function, and the like.

The purpose of learning the artificial neural network can be seen as determining the model parameters that minimize the loss function. The loss function may be used as an index for determining optimal model parameters in the learning process of the artificial neural network.

Machine learning can be classified into supervised learning, unsupervised learning, and reinforcement learning according to a learning method.

Supervised learning refers to a method of training an artificial neural network in a state in which a label for the training data is given, and the label is the correct answer (or result value) that the artificial neural network should infer when the training data is input to the artificial neural network. can mean Unsupervised learning may refer to a method of training an artificial neural network in a state where no labels are given for training data. Reinforcement learning can refer to a learning method in which an agent defined in an environment learns to select an action or sequence of actions that maximizes the cumulative reward in each state.

Among artificial neural networks, machine learning implemented as a deep neural network (DNN) including a plurality of hidden layers is also called deep learning (deep learning), and deep learning is a part of machine learning. Hereinafter, machine learning is used in a sense including deep learning.

In addition, the above-described technical features can be applied to the wireless communication of the robot.

A robot can mean a machine that automatically handles or operates a task given by its own capabilities. In particular, a robot having a function of recognizing an environment and performing an operation by self-judgment may be referred to as an intelligent robot.

Robots can be classified into industrial, medical, home, military, etc. depending on the purpose or field of use. The robot may be provided with a driving unit including an actuator or a motor to perform various physical operations such as moving the robot joints. In addition, the movable robot includes a wheel, a brake, a propeller, and the like in the driving unit, and may travel on the ground or fly in the air through the driving unit.

In addition, the above-described technical features may be applied to a device supporting extended reality.

The extended reality is a generic term for virtual reality (VR), augmented reality (AR), and mixed reality (MR). VR technology provides only CG images of objects or backgrounds in the real world, AR technology provides virtual CG images on top of images of real objects, and MR technology is a computer that mixes and combines virtual objects in the real world. graphic technology.

MR technology is similar to AR technology in that it shows both real and virtual objects. However, there is a difference in that in AR technology, a virtual object is used in a form that complements a real object, whereas in MR technology, a virtual object and a real object are used with equal characteristics.

XR technology can be applied to HMD (Head-Mount Display), HUD (Head-Up Display), mobile phone, tablet PC, laptop, desktop, TV, digital signage, etc. can be called

The claims described herein may be combined in various ways. For example, the technical features of the method claims of the present specification may be combined and implemented as an apparatus, and the technical features of the apparatus claims of the present specification may be combined and implemented as a method. In addition, the technical features of the method claim of the present specification and the technical features of the apparatus claim may be combined to be implemented as an apparatus, and the technical features of the method claim of the present specification and the technical features of the apparatus claim may be combined and implemented as a method.

Claims (16)

1. A method performed in a transmitting STA (station) of a wireless local area network (WLAN) system, the method comprising:

   Create a negotiation frame,

   The negotiation frame includes information related to a target wake-up time (TWT) service period (SP),

   wherein the TWT SP includes a first TWT SP for data transmission and WLAN sensing and a second TWT SP used only for WLAN sensing; and

   transmitting the negotiation frame to a receiving STA;

   method.
2. The method according to claim 1,

   The first TWT SP includes a first time interval for data transmission and a second time interval for WLAN sensing,

   method.
3. The method according to claim 1,

   Information related to the TWT SP,

   Further comprising period information of the first TWT SP and period information of the second TWT SP,

   method.
4. 4. The method according to claim 3,

   The period of the first TWT SP is an integer multiple of the second TWT SP,

   method.
5. The method according to claim 1,

   The negotiation frame is

   Further comprising capability information related to whether the transmitting STA can use the TWT SP for the WLAN sensing,

   method.
6. The method according to claim 1,

   Information related to the TWT SP,

   Further comprising information related to the duration (duration) of the TWT SP,

   method.
7. In a transmitting STA (station) of a wireless local area network (WLAN) system,

   a transceiver for transmitting and receiving a radio signal; and

   a processor coupled to the transceiver, the processor comprising:

   Create a negotiation frame,

   The negotiation frame includes information related to a target wake-up time (TWT) service period (SP),

   the TWT SP includes a first TWT SP for data transmission and WLAN sensing and a second TWT SP used only for WLAN sensing; And

   configured to transmit the negotiation frame to the receiving STA;

   Transmitting STA.
8. 8. The method of claim 7,

   The first TWT SP includes a first time interval for data transmission and a second time interval for WLAN sensing,

   Transmitting STA.
9. 8. The method of claim 7,

   Information related to the TWT SP,

   Further comprising period information of the first TWT SP and period information of the second TWT SP,

   Transmitting STA.
10. 8. The method of claim 7,

    The period of the first TWT SP is an integer multiple of the second TWT SP,

    Transmitting STA.
11. 8. The method of claim 7,

    The negotiation frame is

    Further comprising capability information related to whether the transmitting STA can use the TWT SP for the WLAN sensing,

    Transmitting STA.
12. 8. The method of claim 7,

    Information related to the TWT SP,

    Further comprising information related to the duration (duration) of the TWT SP,

    Transmitting STA.
13. A method performed in a receiving STA (station) of a wireless local area network (WLAN) system, the method comprising:

    Receive a negotiation frame from the transmitting STA,

    The negotiation frame includes information related to a target wake-up time (TWT) service period (SP),

    wherein the TWT SP includes a first TWT SP for data transmission and WLAN sensing and a second TWT SP used only for WLAN sensing; and

    decoding the negotiation frame;

    method.
14. In a receiving STA (station) used in a wireless local area network (WLAN) system,

    a transceiver for transmitting and receiving a radio signal; and

    a processor coupled to the transceiver, the processor comprising:

    Receive a negotiation frame from the transmitting STA,

    The negotiation frame includes information related to a target wake-up time (TWT) service period (SP),

    the TWT SP includes a first TWT SP for data transmission and WLAN sensing and a second TWT SP used only for WLAN sensing; And

    configured to decode the negotiation frame;

    Receiving STA.
15. At least one computer readable recording medium including instructions based on being executed by at least one processor of a transmitting STA (station) of a wireless local area network (WLAN) system medium) in

    Create a negotiation frame,

    The negotiation frame includes information related to a target wake-up time (TWT) service period (SP),

    wherein the TWT SP includes a first TWT SP for data transmission and WLAN sensing and a second TWT SP used only for WLAN sensing; and

    performing an operation including transmitting the negotiation frame to the receiving STA;

    Device.
16. A device on a wireless local area network (WLAN) system, comprising:

    The device is

    Memory; and

    a processor operatively coupled with the memory, the processor comprising:

    Create a negotiation frame,

    The negotiation frame includes information related to a target wake-up time (TWT) service period (SP),

    the TWT SP includes a first TWT SP for data transmission and WLAN sensing and a second TWT SP used only for WLAN sensing; And

    configured to transmit the negotiation frame to the receiving STA;

    Device.

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