Method and apparatus for performing sensing procedure in wireless LAN system

Abstract

Disclosed are a method and an apparatus for performing sensing measurement in a wireless LAN system. In one embodiment of the present disclosure, a method for performing sensing measurement in a wireless LAN system comprises the steps of: receiving a sensing measurement setting request frame including a sensing measurement parameter element from a second STA; transmitting a sensing measurement setting response frame to the second STA in response to the measurement setting request frame; and performing a sensing measurement at a sensing measurement instance based on a sensing measurement parameter element, where the sensing measurement parameter element can include: i) first information indicating whether the sensing measurement instance is a trigger (TB)-based sensing measurement instance or a non-TB sensing measurement instance; and ii) second information indicating a configuration of the sensing measurement instance based on the first information.

Description

Technical Field

[0001] The present disclosure relates to a method and apparatus for performing communication in a wireless local area network (WLAN) system, and more particularly, to a method and apparatus for indicating a configuration of a sensing measurement instance in a next generation wireless LAN system. Background Art

[0002] New technologies have been introduced for wireless LAN (WLAN) to improve transmission rates, increase bandwidth, improve reliability, reduce errors, and reduce latency. Among WLAN technologies, the Institute of Electrical and Electronics Engineers (IEEE) 802.11 series of standards may be referred to as Wi-Fi. For example, technologies recently introduced to WLAN include enhancements to the Very High Throughput (VHT) standard of the 802.11ac standard and enhancements to High Efficiency (HE) of the IEEE 802.11ax standard.

[0003] Improved technologies for providing sensing for devices using wireless LAN signals are being discussed. For example, in the IEEE802.11 Task Group (TG) bf, standard technologies for performing object (e.g., person, object, etc.) sensing based on channel estimation using wireless LAN signals between devices operating in frequency bands below 7 GHz are being developed. Object sensing based on wireless LAN signals has the advantage of utilizing existing frequency bands and has a lower potential for privacy violation compared to existing sensing technologies. As the frequency range used in wireless LAN technology increases, accurate sensing information can be obtained, and technologies for reducing power consumption to effectively support accurate sensing processes are being studied. Summary of the invention

[0004] Technical issues

[0005] A technical problem of the present disclosure is to provide a method and apparatus for performing a sensing process in a wireless LAN system.

[0006] An additional technical problem of the present disclosure is to provide a method and apparatus for indicating configuration of a sensing measurement instance in a sensing measurement setup phase when performing TB (trigger based) sensing measurement.

[0007] The technical objectives achieved by the present disclosure are not limited to the above-mentioned technical objectives, and other technical objectives not described herein will be clearly understood by those skilled in the relevant art from the following description.

[0008] Technical Solution

[0009] According to one embodiment of the present disclosure, a method for performing sensing measurement by a first STA may include: receiving a sensing measurement setup request frame including a sensing measurement parameter element from a second STA; sending a sensing measurement setup response frame to the second STA in response to the measurement setup request frame; and performing sensing measurement in a sensing measurement instance based on the sensing measurement parameter element, and the sensing measurement parameter element may include i) first information indicating whether the sensing measurement instance is a TB (trigger-based) sensing measurement instance or a non-TB sensing measurement instance, and ii) second information indicating the configuration of the sensing measurement instance based on the first information.

[0010] According to one embodiment of the present disclosure, a method for performing sensing measurement by a second STA may include: sending a sensing measurement setup request frame including a sensing measurement parameter element to a first STA; receiving a sensing measurement setup response frame in response to the measurement setup request frame from the first STA; and performing sensing measurement in a sensing measurement instance based on the sensing measurement parameter element, and the sensing measurement parameter element may include i) first information indicating whether the sensing measurement instance is a TB (trigger-based) sensing measurement instance or a non-TB sensing measurement instance, and ii) second information indicating the configuration of the sensing measurement instance based on the first information.

[0011] Beneficial Effects

[0012] According to the present disclosure, a method and apparatus for performing a sensing process in a wireless LAN system may be provided.

[0013] According to various embodiments of the present disclosure, a method and apparatus for indicating a configuration of a sensing measurement instance in a sensing measurement setting phase when performing a TB sensing measurement may be provided.

[0014] According to various embodiments of the present disclosure, a sensing responder can correctly understand configuration information of a sensing measurement instance and perform efficient sensing measurement.

[0015] Effects achievable by the present disclosure are not limited to the above-described effects, and other effects not described herein may be clearly understood by those skilled in the art through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are included as a part of the detailed description for understanding the present disclosure, provide embodiments of the present disclosure and describe technical features of the present disclosure through the detailed description.

[0017] Figure 1 A block configuration diagram of a wireless communication device according to an embodiment of the present disclosure is illustrated.

[0018] Figure 2 is a diagram illustrating an exemplary structure of a WLAN system to which the present disclosure can be applied.

[0019] Figure 3 is a diagram for explaining a link setting process to which the present disclosure can be applied.

[0020] Figure 4 is a diagram for explaining a backoff process to which the present disclosure can be applied.

[0021] Figure 5 is a diagram for explaining a CSMA / CA-based frame transmission operation to which the present disclosure can be applied.

[0022] Figure 6 is a diagram for explaining an example of a frame structure used in a WLAN system to which the present disclosure can be applied.

[0023] Figure 7 is a diagram illustrating an example of a PPDU defined in the IEEE 802.11 standard to which the present disclosure can be applied.

[0024] Figures 8 to 10 is a diagram for explaining an example of a resource unit of a WLAN system to which the present disclosure can be applied.

[0025] Fig.11 An example structure of the HE-SIG-B field is shown.

[0026] Fig.12 is a diagram for explaining a MU-MIMO method in which multiple users / STAs are assigned to one RU.

[0027] Fig.13 An example of a PPDU format to which the present disclosure can be applied is illustrated.

[0028] Fig.14 is a diagram showing an illustrative format of a trigger frame to which the present disclosure may be applied.

[0029] Fig.15 is a diagram for describing a HE non-TB / TB detection process to which the present disclosure may be applied.

[0030] Fig.16 An example of a trigger frame detection step and an NDPA detection step performed in a sensing process according to an embodiment of the present disclosure is illustrated.

[0031] Fig.17 is a diagram for describing an example of a configuration of a sensing measurement instance according to an embodiment of the present disclosure.

[0032] Fig.18 is a diagram for describing a process in which a first STA performs a sensing process according to an embodiment of the present disclosure.

[0033] Fig.19is a diagram for describing a process in which a second STA performs a sensing process according to an embodiment of the present disclosure.

[0034] Fig. 20 2 is a diagram for describing a sensing measurement setting step and a sensing measurement step according to an embodiment of the present disclosure.

[0035] Fig.21 is a diagram for describing a TF detection process to which the present disclosure may be applied. DETAILED DESCRIPTION

[0036] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. The detailed description to be disclosed by the accompanying drawings is intended to describe exemplary embodiments of the present disclosure, rather than to represent the only embodiment in which the present disclosure can be implemented. The following detailed description includes specific details to provide a complete understanding of the present disclosure. However, those skilled in the relevant art will appreciate that the present disclosure can be implemented without these specific details.

[0037] In some cases, well-known structures and devices may be omitted, or may be shown in the form of a block diagram based on the core functions of each structure and device in order to prevent ambiguity in the concepts of the present disclosure.

[0038] In the present disclosure, when an element is referred to as being "connected", "combined" or "linked" to another element, it may include an indirect connection relationship between another element and a direct connection relationship. In addition, in the present disclosure, the term "comprising" or "having" specifies the presence of the mentioned features, steps, operations, components and / or elements, but does not exclude the presence or addition of one or more other features, stages, operations, components, elements and / or groups thereof.

[0039] In the present invention, terms such as "first", "second", etc. are only used to distinguish one element from another element and are not used to limit the elements, and unless otherwise specified, they do not limit the order or importance between the elements. Therefore, within the scope of the present disclosure, the first element in an embodiment may be referred to as the second element in another embodiment, and similarly, the second element in an embodiment may be referred to as the first element in another embodiment.

[0040] The terms used in this disclosure are intended to describe specific embodiments rather than to limit the claims. As used in the description of the embodiments and the appended claims, the singular form is intended to include the plural form unless the context clearly indicates otherwise. The term "and / or" used in this disclosure may refer to one of the related enumerated items, or mean that it refers to and includes any and all possible combinations of two or more of them. In addition, unless otherwise stated, the " / " between words in this disclosure has the same meaning as "and / or".

[0041] Examples of the present disclosure may be applied to various wireless communication systems. For example, examples of the present disclosure may be applied to wireless LAN systems. For example, examples of the present disclosure may be applied to wireless LANs based on IEEE 802.11a / g / n / ac / ax standards. In addition, examples of the present disclosure may be applied to wireless LANs based on the newly proposed IEEE 802.11be (or EHT) standard. Examples of the present disclosure may be applied to wireless LANs based on the IEEE 802.11be version-2 standard corresponding to additional enhanced technologies of the IEEE 802.11be version-1 standard. In addition, examples of the present disclosure may be applied to next-generation standard-based wireless LANs after IEEE 802.11be. In addition, examples of the present disclosure may be applied to cellular wireless communication systems. For example, it may be applied to cellular wireless communication systems based on technologies based on long term evolution (LTE) and technologies based on 5G new radio (NR) based on the third generation partnership project (3GPP) standard.

[0042] Hereinafter, technical features to which examples of the present disclosure can be applied will be described.

[0043] Figure 1 A block diagram of a wireless communication device according to an embodiment of the present disclosure is illustrated.

[0044] Figure 1 The first device 100 and the second device 200 illustrated in the figure may be replaced by various terms, such as terminal, wireless device, wireless transmit / receive unit (WTRU), user equipment (UE), mobile station (MS), user terminal (UT), mobile subscriber station (MSS), mobile subscriber unit (MSU), subscriber station (SS), advanced mobile station (AMS), wireless terminal (WT) or simple user, etc. In addition, the first device 100 and the second device 200 may include an access point (AP), a base station (BS), a fixed station, a node B, a base transceiver system (BTS), a network. It may be replaced by various terms such as an artificial intelligence (AI) system, a road side unit (RSU), a repeater, a router, a repeater and a gateway.

[0045] Figure 1 The devices 100 and 200 illustrated in FIG. 1 may be referred to as stations (STAs). For example, Figure 1The devices 100 and 200 illustrated in the figure may be referred to by various terms such as a transmitting device, a receiving device, a transmitting STA, and a receiving STA. For example, STA110 and 200 may perform an access point (AP) role or a non-AP role. That is, in the present disclosure, STA 110 and 200 may perform the functions of an AP and / or a non-AP. When STA 110 and 200 perform an AP function, they may be referred to as AP for short, and when STA 110 and 200 perform a non-AP function, they may be referred to as STA for short. In addition, in the present disclosure, an AP may also be indicated as an APSTA.

[0046] refer to Figure 1 , the first device 100 and the second device 200 can send and receive radio signals through various wireless LAN technologies (eg, IEEE802.11 series). The first device 100 and the second device 200 may include interfaces for a media access control (MAC) layer and a physical layer (PHY) conforming to the IEEE802.11 standard.

[0047] In addition, the first device 100 and the second device 200 may additionally support various communication standards (e.g., 3GPP LTE series, 5G NR series standards, etc.) technologies other than wireless LAN technology. In addition, the device of the present disclosure may be implemented in various devices, such as mobile phones, vehicles, personal computers, augmented reality (AR) devices, virtual reality (VR) devices, etc. In addition, the STA of the present specification may support various communication services, such as voice calls, video calls, data communications, autonomous driving, machine type communications (MTC), machine to machine (M2M), device to device (D2D), IoT (Internet of Things), etc.

[0048] The first device 100 may include one or more processors 102 and one or more memories 104, and may further include one or more transceivers 106 and / or one or more antennas 108. The processor 102 may control the memory 104 and / or the transceiver 106 and may be configured to implement the description, function, process, proposal, method and / or operation flow chart disclosed in the present disclosure. For example, the processor 102 may send a wireless signal including the first information / signal through the transceiver 106 after generating the first information / signal by processing the information in the memory 104. In addition, the processor 102 may receive a wireless signal including the second information / signal through the transceiver 106, and then store the information obtained by the signal processing of the second information / signal in the memory 104. The memory 104 may be connected to the processor 102 and may store various information related to the operation of the processor 102. For example, the memory 104 may store software code including instructions for executing all or part of the process controlled by the processor 102 or for executing the description, function, process, proposal, method and / or operation flow chart disclosed in the present disclosure. Here, the processor 102 and the memory 104 may be part of a communication modem / circuit / chip designed to implement wireless LAN technology (e.g., LTE 802.11 series). The transceiver 106 may be connected to the processor 102 and may send and / or receive wireless signals through one or more antennas 108. The transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be used in conjunction with an RF (radio frequency) unit. In the present disclosure, a device may refer to a communication modem / circuit / chip.

[0049] The second device 200 may include one or more processors 202 and one or more memories 204, and may further include one or more transceivers 206 and / or one or more antennas 208. The processor 202 may control the memory 204 and / or the transceiver 206 and may be configured to implement the description, function, process, proposal, method and / or operation flow chart disclosed in the present disclosure. For example, the processor 202 may generate third information / signal by processing the information in the memory 204, and then send a wireless signal including the third information / signal through the transceiver 206. In addition, the processor 202 may receive a wireless signal including fourth information / signal through the transceiver 206, and then store the information obtained by signal processing of the fourth information / signal in the memory 204. The memory 204 may be connected to the processor 202 and may store various information related to the operation of the processor 202. For example, the memory 204 may store software code including instructions for executing all or part of the process controlled by the processor 202 or for executing the description, function, process, proposal, method and / or operation flow chart disclosed in the present disclosure. Here, the processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement wireless LAN technology (e.g., IEEE 802.11 series). The transceiver 206 may be connected to the processor 202 and may send and / or receive wireless signals through one or more antennas 208. The transceiver 206 may include a transmitter and / or a receiver. The transceiver 206 may be used in conjunction with an RF unit. In the present disclosure, a device may refer to a communication modem / circuit / chip.

[0050] In the following, the hardware elements of the device 100, 200 will be described in more detail. It is not limited thereto, but one or more protocol layers may be implemented by one or more processors 102, 202. For example, one or more processors 102, 202 may implement one or more layers (e.g., functional layers such as PHY, MAC). One or more processors 102, 202 may generate one or more PDUs (protocol data units) and / or one or more SDUs (service data units) according to the description, function, process, proposal, method, and / or operation flow chart disclosed in the present disclosure. One or more processors 102, 202 may generate messages, control information, data, or information according to the description, function, process, proposal, method, and / or operation flow chart disclosed in the present disclosure. One or more processors 102, 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the functions, processes, proposals, and / or methods disclosed in the present disclosure to provide them to one or more transceivers 106, 206. The one or more processors 102, 202 may receive signals (e.g., baseband signals) from the one or more transceivers 106, 206 and obtain PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operational flow charts disclosed in the present disclosure.

[0051] One or more processors 102, 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102, 202 may be implemented by hardware, firmware, software, or a combination thereof. In an example, one or more ASICs (Application Specific Integrated Circuits), one or more DSPs (Digital Signal Processors), one or more DSPDs (Digital Signal Processing Devices), one or more PLDs (Programmable Logic Devices), or one or more FPGAs (Field Programmable Gate Arrays) may be included in one or more processors 102, 202. The descriptions, functions, processes, proposals, methods, and / or operational flowcharts included in the present disclosure may be implemented using firmware or software and the firmware or software may be implemented to include modules, processes, functions, etc. Firmware or software configured to execute the descriptions, functions, processes, proposals, methods, and / or operational flowcharts included in the present disclosure may be included in one or more processors 102, 202 or may be stored in one or more memories 104, 204 and driven by one or more processors 102, 202. The descriptions, functions, processes, proposals, methods, and / or operational flowcharts included in the present disclosure may be implemented by firmware or software in the form of codes, commands, and / or command sets.

[0052] One or more memories 104, 204 may be connected to one or more processors 102, 202 and may store data, signals, messages, information, programs, codes, instructions, and / or commands in various forms. One or more memories 104, 204 may be configured with ROM, RAM, EPROM, flash memory, hard drive, registers, cache memory, computer-readable storage media, and / or combinations thereof. One or more memories 104, 204 may be located inside and / or outside one or more processors 102, 202. In addition, one or more memories 104, 204 may be connected to one or more processors 102, 202 via a variety of technologies such as wired or wireless connections.

[0053] One or more transceivers 106, 206 may send user data, control information, wireless signals / channels, etc. mentioned in the methods and / or operation flow charts, etc. of the present disclosure to one or more other devices. One or more transceivers 106, 206 may receive user data, control information, wireless signals / channels, etc. mentioned in the descriptions, functions, processes, proposals, methods, and / or operation flow charts, etc. included in the present disclosure from one or more other devices. For example, one or more transceivers 106, 206 may be connected to one or more processors 102, 202 and may send and receive wireless signals. For example, one or more processors 102, 202 may control one or more transceivers 106, 206 to send user data, control information, or wireless signals to one or more other devices. In addition, one or more processors 102, 202 may control one or more transceivers 106, 206 to receive user data, control information, or wireless signals from one or more other devices. In addition, one or more transceivers 106, 206 may be connected to one or more antennas 108, 208, and one or more transceivers 106, 206 may be configured to send and receive user data, control information, wireless signals / channels, etc. mentioned in the description, functions, processes, proposals, methods and / or operation flow charts, etc. included in the present disclosure through one or more antennas 108, 208. In the present invention, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106, 206 may convert received wireless signals / channels, etc. from RF band signals to baseband signals by using one or more processors 102, 202 to process received user data, control information, wireless signals / channels, etc. One or more transceivers 106, 206 may convert user data, control information, wireless signals / channels, etc. processed by using one or more processors 102, 202 from baseband signals to RF band signals. Therefore, one or more transceivers 106, 206 may include (analog) oscillators and / or filters.

[0054] For example, one of the STAs 100 and 200 may perform the intended operation of an AP, and the other of the STAs 100 and 200 may perform the intended operation of a non-AP STA. Figure 1 The transceivers 106 and 206 of the present invention may perform transmission and reception operations of signals (e.g., packets or physical layer protocol data units (PPDUs) compliant with IEEE 802.11a / b / g / n / ac / ax / be). In addition, in the present disclosure, operations in which various STAs generate transmission / reception signals or perform data processing or calculation on transmission / reception signals in advance may be performed by Figure 1 The processors 102 and 202 are executed. For example, examples of operations of generating a transmit / receive signal or performing data processing or calculation on the transmit / receive signal in advance may include 1) determining / obtaining / configuring / calculating / decoding / encoding bit information of fields (signal (SIG), short training field (STF), long training field (LTF), data, etc.) included in the PPDU, 2) determining / configuring / obtaining time resources or frequency resources (e.g., subcarrier resources) used for fields (SIG, STF, LTF, data, etc.) included in the PPDU; 3) determining / configuring / obtaining a specific sequence (e.g., pilot sequence, STF / LTF sequence, additional sequence applied to SIG) for fields (SIG, STF, LTF, data, etc.) included in the PPDU action, 4) power control operations and / or power saving operations applied to STAs, 5) operations related to ACK signal determination / obtaining / configuring / calculating / decoding / encoding, etc. In addition, in the following examples, various information used by various STAs to determine / acquire / configure / calculate / decode / encode transmission and reception signals (e.g., information related to fields / subfields / control fields / parameters / power, etc.) may be stored in Figure 1 in the memories 104 and 204.

[0055] Hereinafter, downlink (DL) may mean a link for communication from an AP STA to a non-AP STA, and a DL PPDU / packet / signal may be transmitted and received through the DL. In DL communication, a transmitter may be a part of an AP STA, and a receiver may be a part of a non-AP STA. An uplink (UL) may mean a link for communication from a non-AP STA to an AP STA, and a UL PPDU / packet / signal may be transmitted and received through the UL. In UL communication, a transmitter may be a part of a non-AP STA, and a receiver may be a part of an AP STA.

[0056] Figure 2 is a diagram illustrating an exemplary structure of a wireless LAN system to which the present disclosure can be applied.

[0057] The structure of a wireless LAN system may consist of multiple components. A wireless LAN that supports STA mobility transparent to upper layers may be provided through the interaction of multiple components. A basic service set (BSS) corresponds to a basic building block of a wireless LAN. Figure 2 It is exemplarily shown that two BSSs (BSS1 and BSS2) exist and two STAs are included as members of each BSS (STA1 and STA2 are included in BSS1, and STA3 and STA4 are included in BSS2). Figure 2 The ellipse representing the BSS in FIG. 1 may also be understood to represent a coverage area in which the STAs included in the corresponding BSS maintain communication. This area may be referred to as a basic service area (BSA). When a STA moves out of a BSA, it cannot directly communicate with other STAs in the BSA.

[0058] If you don't consider Figure 2 , the most basic type of BSS in a wireless LAN is an independent BSS (IBSS), if the DS shown in is included. For example, an IBSS may have a minimal form containing only two STAs. For example, assuming that other components are omitted, BSS1 containing only STA1 and STA2 or BSS2 containing only STA3 and STA4 may correspond to representative examples of IBSSs, respectively. This configuration is possible when STAs can communicate directly without an AP. In addition, in this type of wireless LAN, it is not configured in advance but can be configured when a LAN is needed, and this may be referred to as a self-organizing network. Because the IBSS does not include an AP, there is no centralized management entity. That is, in the IBSS, STAs are managed in a distributed manner. In an IBSS, all STAs may be composed of mobile STAs, and access to a distributed system (DS) is not allowed, thereby forming a self-contained network.

[0059] The membership of a STA in a BSS can be changed dynamically by turning the STA on or off, entering or exiting a BSS region, etc. To become a member of a BSS, a STA can join the BSS using a synchronization process. In order to access all services of the BSS infrastructure, a STA should be associated with the BSS. This association can be established dynamically and can include the use of distributed system services (DSS).

[0060] The direct STA-to-STA distance in a wireless LAN may be limited by PHY performance. In some cases, this distance limitation may be sufficient, but in some cases, communication between STAs at greater distances may be required. A distributed system (DS) can be configured to support extended coverage.

[0061] DS means a structure in which BSSs are interconnected. Specifically, Figure 2As shown in , the BSS can exist as an extended form of a network composed of multiple BSSs. DS is a logical concept and can be specified by the characteristics of the distributed system medium (DSM). In this regard, the wireless medium (WM) and the DSM can be logically separated. Each logical medium is used for a different purpose and is used by different components. These media are not limited to being the same or different. In this way, the flexibility of the wireless LAN structure (DS structure or other network structure) can be explained by the logical difference of multiple media. That is, the wireless LAN structure can be implemented in various ways, and the corresponding wireless LAN structure can be independently specified by the physical characteristics of each embodiment.

[0062] DS can support mobile devices by providing seamless integration of multiple BSSs and providing logical services necessary to address addresses to destinations. In addition, DS can further include a component called a portal, which serves as a bridge for connection between wireless LAN and other networks (e.g., IEEE 802.X).

[0063] The AP enables access to the DS through the WM for the associated non-AP STAs and means an entity that also has the functionality of a STA. Data movement between the BSS and the DS can be performed by the AP. For example, Figure 2 STA2 and STA3 shown in the figure have the functionality of STA and provide the function of allowing the associated non-AP STA (STA1 and STA4) to access the DS. In addition, because all APs basically correspond to STAs, all APs are addressable entities. The address used by the AP for communication on the WM and the address used by the AP for communication on the DSM are not necessarily the same. A BSS composed of an AP and one or more STAs can be called an infrastructure BSS.

[0064] Data sent from one of the STAs associated with an AP to the STA address of the corresponding AP can always be received on an uncontrolled port and can be processed by the IEEE 802.1X port access entity. In addition, when the controlled port is authenticated, the transmission data (or frame) can be delivered to the DS.

[0065] In addition to the above structure of DS, an extended service set (ESS) can also be configured to provide wide coverage.

[0066] ESS means a network in which a network of arbitrary size and complexity is composed of DS and BSS. ESS may correspond to a set of BSSs connected to one DS. However, ESS does not include DS. The ESS network is characterized by being regarded as an IBSS in the logical link control (LLC) layer. STAs included in the ESS can communicate with each other, and a mobile STA can move from one BSS to another BSS (within the same ESS) which is transparent to LLC. APs included in one ESS may have the same service set identifier (SSID). SSID is distinguished from BSSID, which is an identifier of BSS.

[0067] The wireless LAN system does not assume anything about the relative physical location of the BSS, and all of the following forms are possible. BSSs may partially overlap, which is a form commonly used to provide continuous coverage. In addition, the BSSs may not be physically connected, and logically, there is no limit to the distance between the BSSs. In addition, the BSSs may be physically located in the same location, which can be used to provide redundancy. In addition, one (or more) IBSSs or ESS networks may physically exist in the same space as one (or more) ESS networks. When an ad hoc network operates in a location where an ESS network exists, when physically overlapping wireless networks are configured by different organizations, or when two or more different access and security policies are required in the same location, this can be similar to the form corresponding to an ESS network.

[0068] Figure 3 is a diagram for explaining a link setting process to which the present disclosure can be applied.

[0069] In order for a STA to establish a link with respect to a network and send / receive data, it first discovers the network, performs authentication, establishes association, and needs to perform an authentication process for security. The link establishment process may also be referred to as a session initiation process or a session establishment process. In addition, the processes of discovery, authentication, association, and security settings of the link establishment process may be collectively referred to as an association process.

[0070] In step S310, the STA may perform a network discovery operation. The network discovery operation may include a scanning operation of the STA. That is, in order for the STA to access the network, it needs to find a network that it can participate in. The STA should identify compatible networks before participating in a wireless network, and the process of identifying networks existing in a specific area is called scanning.

[0071] Scanning schemes include active scanning and passive scanning. Figure 3The network discovery operation including the active scanning process is exemplarily illustrated. In active scanning, the STA performing the scan sends a probe request frame while moving the channel to find out which APs exist around it and wait for a response thereto. The responder sends a probe response frame to the STA that has sent the probe request frame as a response to the probe request frame. Here, the responder may be the STA that last sent a beacon frame in the BSS of the scanned channel. In the BSS, because the AP sends a beacon frame, the AP becomes the responder, and in the IBSS, the STAs in the IBSS take turns sending beacon frames, so the responder is not constant. For example, a STA that sends a probe request frame on channel 1 and receives a probe response frame on channel 1 may store the BSS-related information included in the received probe response frame, and may move to the next channel (e.g., channel 2) and perform scanning in the same manner (i.e., transmission / reception of probe requests / responses on channel 2).

[0072] Although Figure 3 Although not shown in the figure, the scanning operation can be performed in a passive scanning manner. In passive scanning, the STA performing the scan waits for a beacon frame while moving the channel. The beacon frame is one of the management frames defined in IEEE 802.11, and is sent periodically to notify the existence of a wireless network and allow the STA performing the scan to find the wireless network and participate in the wireless network. In the BSS, the AP is used to send beacon frames periodically, and in the IBSS, the STAs within the IBSS take turns to send beacon frames. When the STA performing the scan receives the beacon frame, the STA stores the information for the BSS included in the beacon frame and records the beacon frame information in each channel while moving to another channel. The STA receiving the beacon frame can store the BSS-related information included in the received beacon frame, move to the next channel, and perform scanning in the next channel in the same manner. Comparing active scanning and passive scanning, active scanning has the advantages of less delay and lower power consumption than passive scanning.

[0073] After the STA discovers the network, an authentication process may be performed in step S320. In order to clearly distinguish it from the security setup operation of step S340 to be described later, this authentication process may be referred to as a first authentication process.

[0074] The authentication process includes a process in which the STA sends an authentication request frame to the AP, and in response thereto, the AP sends an authentication response frame to the STA. The authentication frame for authentication request / response corresponds to a management frame.

[0075] The authentication frame includes an authentication algorithm number, an authentication transaction sequence number, a status code, a challenge text, a robust security network (RSN), and a limited cycle group, etc. This corresponds to some examples of information that can be included in the authentication request / response frame, and can be replaced with other information or can further include additional information.

[0076] The STA may send an authentication request frame to the AP. The AP may determine whether to allow authentication of the corresponding STA based on the information included in the received authentication request frame. The AP may provide the result of the authentication process to the STA through an authentication response frame.

[0077] After the STA is successfully authenticated, an association process may be performed in step S330. The association process includes a process in which the STA sends an association request frame to the AP, and in response, the AP sends an association response frame to the STA.

[0078] For example, the association request frame may include information related to various capabilities, beacon listening interval, service set identifier (SSID), supported rates, supported channels, RSN, mobile domain, supported operation category, traffic indication map broadcast request (TIM broadcast request), interworking service capabilities, etc. For example, the association response frame may include information related to various capabilities, status code, association ID (AID), supported rates, enhanced distributed channel access (EDCA) parameter set, received channel power indicator (RCPI), received signal-to-noise ratio indicator (RSNI), mobile domain, timeout interval (e.g., association recovery time), overlapping BSS scanning parameters, TIM broadcast response, quality of service (QoS) map, etc. This corresponds to some examples of information that may be included in the association request / response frame, and may be replaced with other information, or may further include additional information.

[0079] After the STA successfully associates with the network, a security setup process may be performed in step S340. The security setup process of step S340 may be referred to as an authentication process through a robust security network association (RSNA) request / response, and the authentication process of step S320 may be referred to as a first authentication process, and the security setup process of step S340 may also be referred to simply as an authentication process.

[0080] The security setup process of step S340 may include, for example, a process of establishing a private key through a 4-way handshake of an Extensible Authentication Protocol over LAN (EAPOL) frame. In addition, the security setup process may be performed according to a security scheme not defined in the IEEE 802.11 standard.

[0081] Figure 4 is a diagram for explaining a backoff process to which the present disclosure can be applied.

[0082] In a wireless LAN system, the basic access mechanism of the medium access control (MAC) is the carrier sense multiple access with collision avoidance (CSMA / CA) mechanism. The CSMA / CA mechanism is also called the distributed coordination function (DCF) of the IEEE 802.11 MAC, and basically adopts a "listen before talk" access mechanism. According to this type of access mechanism, the AP and / or STA may perform a clear channel assessment (CCA) for sensing a wireless channel or medium within a predetermined time interval (e.g., a DCF interframe space (DIFS)) before starting transmission. As a result of the sensing, if it is determined that the medium is in an idle state, frame transmission is started through the corresponding medium. On the other hand, if it is detected that the medium is occupied or busy, the corresponding AP and / or STA does not start its own transmission, and a delay period (e.g., a random backoff period) for medium intervention may be set and frame transmission may be attempted after waiting. By applying a random backoff period, collisions can be minimized because several STAs are expected to attempt frame transmission after waiting for different time periods.

[0083] In addition, the IEEE 802.11 MAC protocol provides a hybrid coordination function (HCF). HCF is based on DCF and point coordination function (PCF). PCF is a polling-based synchronous access method, and refers to a method in which all receiving APs and / or STAs periodically poll to receive data frames. In addition, HCF has enhanced distributed channel access (EDCA) and HCF-controlled channel access (HCCA). EDCA is a contention-based access method for a provider to provide data frames to multiple users, and HCCA uses a non-contention-based channel access method using a polling mechanism. In addition, HCF includes a media access mechanism for improving the QoS (Quality of Service) of a wireless LAN, and QoS data can be sent in both a contention period (CP) and a contention-free period (CFP).

[0084] refer to Figure 4, the operation based on the random backoff period will be described. When an occupied / busy medium becomes idle, several STAs may attempt to send data (or frames). As a method for minimizing conflicts, each STA may select a random backoff count and attempt to transmit after waiting for the corresponding time slot time. The random backoff count has a pseudo-random integer value and can be determined as one of the values ​​ranging from 0 to CW. Here, CW is the contention window parameter value. The CW parameter is assigned CWmin as an initial value, but if a transmission failure occurs (for example, when an ACK for a sent frame is not received), it can take a value twice as large. When the CW parameter value reaches CWmax, data transmission can be attempted while maintaining the CWmax value until data transmission is successful, and when data transmission is successful, the CWmin value is reset. The values ​​of CW, CWmin, and CWmax are preferably set to 2n-1 (n = 0, 1, 2, ...).

[0085] When the random backoff process starts, the STA continuously monitors the medium while counting down the backoff slot according to the determined backoff count value. When it detects that the medium is occupied, it stops the countdown and waits, and when the medium becomes idle, it resumes the remaining countdown.

[0086] exist Figure 4 In the example of , when the packet to be sent arrives at the MAC of STA3, STA3 can send the frame immediately after confirming that the medium is idle for as much as DIFS. The remaining STAs monitor and wait for the medium to be occupied / busy. At the same time, data to be sent may also occur in each of STA1, STA2 and STA5, and when the medium is monitored as idle, each STA waits as long as DIFS, and then the backoff slot can be counted down according to the random backoff count value selected by each STA. Assume that STA2 selects the minimum backoff count value and STA1 selects the maximum backoff count value. That is, the case where the remaining backoff time of STA5 is less than the remaining backoff time of STA1 when STA2 completes the backoff count and starts frame transmission is illustrated. STA1 and STA5 temporarily stop the countdown and wait while STA2 occupies the medium. When STA2 occupancy ends and the medium becomes idle again, STA1 and STA5 wait for DIFS and resume the stopped backoff count. That is, after counting down the remaining backoff slot within the remaining backoff time, frame transmission can be started. Because the remaining backoff time of STA5 is less than that of STA1, STA5 starts frame transmission. While STA2 occupies the medium, data to be sent may also appear in STA4. From the perspective of STA4, when the medium becomes idle, STA4 can wait for DIFS, and then perform a countdown according to the random backoff count value selected by STA4 and start sending frames. Figure 4The example shows a case where the remaining backoff time of STA5 coincides with the random backoff count value of STA4. In this case, a collision may occur between STA4 and STA5. When a collision occurs, neither STA4 nor STA5 receives an ACK, so data transmission fails. In this case, STA4 and STA5 can double the CW value, select a random backoff count value, and perform a countdown. STA1 waits while the medium is occupied due to the transmission of STA4 and STA5, waits for DIFS when the medium becomes idle, and then starts frame transmission after the remaining backoff time has elapsed.

[0087] like Figure 4 As shown in the example of , a data frame is a frame for transmitting data forwarded to a higher layer, and may be sent after performing a backoff after DIFS has elapsed from when the medium becomes idle. In addition, a management frame is a frame for exchanging management information that is not forwarded to a higher layer, and is sent after performing a backoff after an IFS such as DIFS or a point coordination function IFS (PIFS). As subtype frames of the management frame, there are beacons, association request / responses, reassociation request / responses, probe request / responses, authentication request / responses, and the like. A control frame is a frame for controlling access to a medium. As subtype frames of the control frame, there are request to send (RTS), clear to send (CTS), acknowledgement (ACK), power save poll (PS-Poll), block ACK (BlockAck), block ACK request (BlockACKReq), empty data packet announcement (NDP announcement), and triggers, and the like. If the control frame is not a response frame of a previous frame, it is sent after performing a backoff after DIFS has elapsed, and if it is a response frame of a previous frame, it is sent without performing a backoff after a short IFS (SIFS) has elapsed. The type and subtype of a frame can be identified by the type field and subtype field in the frame control (FC) field.

[0088] Quality of Service (QoS) STA can perform a backoff performed after the arbitration IFS (AIFS) of the access category (AC) to which the frame belongs, that is, AIFS [i] (where i is a value determined by AC), and then can transmit the frame. Here, the frame that can use AIFS [i] may be a data frame, a management frame, or a control frame other than a response frame.

[0089] Figure 5 is a diagram for explaining a CSMA / CA-based frame transmission operation to which the present disclosure can be applied.

[0090] As described above, the CSMA / CA mechanism includes virtual carrier sensing in addition to the physical carrier sensing in which the STA directly senses the medium. Virtual carrier sensing is intended to compensate for problems that may occur in media access, such as hidden node problems. For virtual carrier sensing, the STA's MAC can use a network allocation vector (NAV). NAV is a value that indicates to other STAs the remaining time until the medium is available for use by the STA that is currently using or has the right to use the medium. Therefore, the value set to NAV corresponds to the period in which the medium is scheduled for use by the STA that sends the frame, and the STA that receives the NAV value is prohibited from accessing the medium during the corresponding period. For example, the NAV can be configured based on the value of the "Duration" field of the MAC header of the frame.

[0091] exist Figure 5 In the example of FIG. 1 , it is assumed that STA1 intends to send data to STA2, and STA3 is in a position to eavesdrop on some or all frames sent and received between STA1 and STA2.

[0092] In order to reduce the possibility of transmission conflicts between multiple STAs in CSMA / CA-based frame transmission operations, a mechanism using RTS / CTS frames can be applied. Figure 5 In the example of , while STA1's transmission is being performed, as a result of STA3's carrier sensing, it can be determined that the medium is in an idle state. That is, STA1 may correspond to a hidden node of STA3. Alternatively, Figure 5 In the example of , it can be determined that the carrier sensing result medium of STA3 is in an idle state while the transmission of STA2 is performed. That is, STA2 may correspond to a hidden node of STA3. By performing the exchange of RTS / CTS frames before data transmission and reception between STA1 and STA2, STAs outside the transmission range of one of STA1 or STA2, or STAs outside the carrier sensing range for transmission from STA1 or STA3 may not attempt to occupy the channel during data transmission and reception between STA1 and STA2.

[0093] Specifically, STA1 can determine whether the channel is in use through carrier sensing. In terms of physical carrier sensing, STA1 can determine the channel occupancy idle state based on the energy level or signal correlation detected in the channel. In addition, in terms of virtual carrier sensing, STA1 can use the network allocation vector (NAV) timer to determine the channel occupancy state.

[0094] When the channel is idle during DIFS, STA1 may send an RTS frame to STA2 after performing backoff. When STA2 receives the RTS frame, STA2 may send a CTS frame to STA1 after SIFS as a response to the RTS frame.

[0095] If STA3 cannot eavesdrop on the CTS frame from STA2 but can eavesdrop on the RTS frame from STA1, STA3 can set the NAV timer for the subsequent consecutively transmitted frame transmission period (e.g., SIFS+CTS frame+SIFS+data frame+SIFS+ACK frame) using the duration information included in the RTS frame. Alternatively, if STA3 can eavesdrop on the CTS frame from STA2, although STA3 cannot eavesdrop on the RTS frame from STA1, STA3 can set the NAV timer for the subsequent consecutively transmitted frame transmission period (e.g., SIFS+data frame+SIFS+ACK frame) using the duration information included in the CTS frame. That is, if STA3 can eavesdrop on one or more of the RTS or CTS frames from one or more of STA1 or STA2, STA3 can set the NAV accordingly. When STA3 receives a new frame before the NAV timer expires, STA3 can update the NAV timer using the duration information included in the new frame. STA3 does not attempt channel access before the NAV timer expires.

[0096] When STA1 receives a CTS frame from STA2, STA1 may send a data frame to STA2 after SIFS from the time point when reception of the CTS frame is completed. When STA2 successfully receives the data frame, STA2 may send an ACK frame to STA1 as a response to the data frame after SIFS. STA3 may determine whether the channel is being used by carrier sensing when the NAV timer expires. When STA3 determines that the channel is not being used by other terminals during DIFS after the NAV timer expires, STA3 may attempt channel access after a contention window (CW) according to random backoff has elapsed.

[0097] Figure 6 is a diagram for explaining an example of a frame structure used in a WLAN system to which the present disclosure can be applied.

[0098] With the help of instructions or primitives (meaning a set of instructions or parameters) from the MAC layer, the PHY layer can prepare the MAC PDU (MPDU) to be sent. For example, when receiving a command requesting the PHY layer to start transmission from the MAC layer, the PHY layer switches to the transmission mode and configures the information (e.g., data) provided from the MAC layer in the form of a frame and sends it. In addition, when the PHY layer detects a valid preamble of the received frame, the PHY layer monitors the header of the preamble and sends a command to the MAC layer notifying the PHY layer of the start of reception.

[0099] In this manner, information transmission / reception in the wireless LAN system is performed in the form of a frame, and for this purpose, a PHY layer protocol data unit (PPDU) frame format is defined.

[0100] The basic PPDU frame may include a short training field (STF), a long training field (LTF), a signal (SIG) field, and a data field. The most basic (e.g., non-high throughput (HT)) PPDU frame format may consist of only L-STF (legacy STF), L-LTF (legacy LTF), SIG field, and data field. In addition, depending on the type of PPDU frame format (e.g., HT mixed format PPDU, HT-greenfield format PPDU, VHT (very high throughput) PPDU, etc.), additional (or different types of) STF, LTF, and SIG fields may be included between the SIG field and the data field (this will be referred to later). Figure 7 for description).

[0101] STF is a signal used for signal detection, automatic gain control (AGC), diversity selection, precise time synchronization, etc., and LTF is a signal used for channel estimation and frequency error estimation. STF and LTF may be referred to as signals for synchronization and channel estimation of the OFDM physical layer.

[0102] The SIG field may include a RATE field and a LENGTH field. The RATE field may include information about the modulation and coding rate of the data. The LENGTH field may include information about the length of the data. In addition, the SIG field may include a parity bit, a SIG TAIL bit, etc.

[0103] The data field may include a SERVICE field, a physical layer service data unit (PSDU), and a PPDU TAIL bit, and may also include padding bits if necessary. Some bits of the SERVICE field may be used for synchronization of the descrambler at the receiving end. The PSDU corresponds to the MAC PDU defined in the MAC layer and may include data generated / used in the upper layer. The PPDU TAIL bit may be used to return the encoder to the 0 state. The padding bit may be used to adjust the length of the data field in predetermined units.

[0104] MAC PDU is defined according to various MAC frame formats, and a basic MAC frame consists of a MAC header, a frame body, and a frame check sequence (FCS). A MAC frame can be composed of a MAC PDU and transmitted / received through a PSDU of the data portion of a PPDU frame format.

[0105] The MAC header includes a frame control field, a duration / ID field, an address field, etc. The frame control field may include control information required for frame transmission / reception. The duration / ID field may be set to the time for transmitting the corresponding frame, etc. For detailed information on the sequence control, QoS control, and HT control subfields of the MAC header, please refer to the IEEE 802.11 standard document.

[0106] The Null Data Packet (NDP) frame format means a frame format that does not include a data packet. That is, the NDP frame refers to a frame format that includes a physical layer convergence procedure (PLCP) header portion (ie, STF, LTF, and SIG fields) in a general PPDU frame format and does not include the remaining portion (ie, data field). The NDP frame may also be referred to as a short frame format.

[0107] Figure 7 is a diagram illustrating an example of a PPDU defined in the IEEE 802.11 standard to which the present disclosure can be applied.

[0108] In standards such as IEEE 802.11a / g / n / ac / ax, various types of PPDUs have been used. The basic PPDU format (IEEE 802.11a / g) includes L-LTF, L-STF, L-SIG, and data fields. The basic PPDU format may also be referred to as a non-HT PPDU format.

[0109] The HT PPDU format (IEEE 802.11n) includes HT-SIG, HT-STF, and HT-LFT fields in addition to the basic PPDU format. Figure 7 The HT PPDU format shown in may be referred to as an HT-mixed format. In addition, an HT-greenfield format PPDU may be defined, and this corresponds to a format consisting of an HT-GF-STF, HT-LTF1, HT-SIG, one or more HT-LTFs, and a data field, excluding L-STF, L-LTF, and L-SIG (not shown).

[0110] An example of a VHT PPDU format (IEEE 802.11ac) includes VHT SIG-A, VHT-STF, VHT-LTF, and VHT-SIG-B fields in addition to the basic PPDU format.

[0111] An example of the HE PPDU format (IEEE 802.11ax) includes repeated L-SIG (RL-SIG), HE-SIG-A, HE-SIG-B, HE-STF, HE-LTF (s), and packet extension (PE) fields in addition to the basic PPDU format. According to the detailed example of the HE PPDU format, some fields may be excluded or their lengths may vary. For example, the HE-SIG-B field is included in the HE PPDU format for multi-user (MU), and the HE-SIG-B field is not included in the HE PPDU format for single user (SU). In addition, the PPDU format based on the HE trigger (TB) does not include the HE-SIG-B, and the length of the HE-STF field may vary to 8us. The extended range (HE ER) SU PPDU format does not include the HE-SIG-B field, and the length of the HE-SIG-A field may vary to 16us.

[0112] Figures 8 to 10 is a diagram for explaining an example of a resource unit of a WLAN system to which the present disclosure can be applied.

[0113] refer to Figures 8 to 10 , a resource unit (RU) defined in a wireless LAN system will be described. A RU may include multiple subcarriers (or tones). When a signal is transmitted to multiple STAs based on an OFDMA scheme, the RU may be used. In addition, even when a signal is transmitted to one STA, the RU may be defined. The RU may be used for a data field of an STF, an LTF, a PPDU, etc.

[0114] like Figures 8 to 10 As shown, RUs corresponding to different numbers of tones (i.e., subcarriers) are used to construct some fields of a 20 MHz, 40 MHz, or 80 MHz X-PPDU (X is HE, EHT, etc.). For example, resources can be allocated in RU units as shown for the X-STF, X-LTF, and data fields.

[0115] Figure 8 is a diagram illustrating an exemplary allocation of resource units (RUs) used on a 20 MHz band.

[0116] like Figure 8As shown at the top of , 26 units (i.e., units corresponding to 26 tones) can be allocated. 6 tones can be used as a guard band in the leftmost band of the 20MHz band, and 5 tones can be used as a guard band in the rightmost band of the 20MHz band. In addition, 7 DC tones are inserted in the center band, i.e., the DC band, and 26 units corresponding to each of the 13 tones can exist on the left and right sides of the DC band. In addition, 26 units, 52 units, and 106 units can be allocated to other bands. Each unit can be allocated for an STA or a user.

[0117] Figure 8 The RU allocation is utilized not only in the case of multi-user (MU) but also in the case of single user (SU), and in this case, a 242 unit can be used, such as Figure 8 In this case, three DC tones can be inserted.

[0118] exist Figure 8 In the examples of the present disclosure, various sizes of RUs, i.e., 26-RU, 52-RU, 106-RU, 242-RU, etc., are illustrated, but the specific sizes of these RUs may be reduced or enlarged. Therefore, in the present disclosure, the specific size of each RU (i.e., the number of corresponding tones) is exemplary and not restrictive. In addition, within the predetermined bandwidth (e.g., 20, 40, 80, 160, 320 MHz, ...) of the present disclosure, the number of RUs may vary according to the size of the RU. In the following description, Fig. 9 and / or Fig.10 The fact that the size and / or number of RUs can vary is related to Figure 8 The same example.

[0119] Fig. 9 is a diagram illustrating an exemplary allocation of resource units (RUs) used on a 40 MHz band.

[0120] As in Figure 8 As in the example using various RU sizes, Fig. 9 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, etc. may also be used in the example. In addition, 5 DC tones may be inserted at the center frequency, 12 tones may be used as a guard band in the leftmost band of the 40 MHz band, and 11 tones may be used as a guard band in the rightmost band of the 40 MHz band.

[0121] Additionally, as shown, when used for a single user, 484-RU may be used.

[0122] Fig.10is a diagram illustrating an exemplary allocation of resource units (RUs) used on an 80 MHz band.

[0123] Just like in Figure 8 and Fig. 9 As in the example using various RU sizes, Fig.10 In the example of 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, 996-RU, etc., can also be used. In addition, in the case of 80MHz PPDU, the RU allocation of HE PPDU and EHT PPDU may be different, and Fig.10 The example of FIG. 1 shows an example of RU allocation for an 80 MHz EHT PPDU. Fig.10 The scheme of using 12 tones as a guard band in the leftmost band of the 80MHz band and 11 tones as a guard band in the rightmost band of the 80MHz band in the example is the same in the HE PPDU and the EHT PPDU. Unlike the HE PPDU, 7 DC tones are inserted in the DC band and there is one 26-RU corresponding to each of the 13 tones on the left and right sides of the DC band, in the EHT PPDU, 23 DC tones are inserted in the DC band, and there is one 26-RU on the left and right sides of the DC band. Unlike the HE PPDU, there are five empty subcarriers in the EHT PPDU, where there is one empty subcarrier between 242-RUs instead of between the center bands. In the HE PPDU, one 484-RU does not include an empty subcarrier, but in the EHT PPDU, one 484-RU includes 5 empty subcarriers.

[0124] Additionally, as shown, when used for a single user, 996-RU may be used, and in this case, 5 DC tones are inserted together with the HEPPDU and EHT PPDU.

[0125] The 160MHz EHT PPDU can be configured with Fig.10 The RU allocation for each 80MHz sub-block can be Fig.10 If the 80 MHz sub-block of a 160 MHz or 320 MHz EHT PPDU is not punctured and the entire 80 MHz sub-block is used as a RU or part of multiple RUs (MRUs), the 80 MHz sub-block can be used Fig.10 The 996-RU.

[0126] Here, the MRU corresponds to a group of subcarriers (or tones) composed of multiple RUs, and the multiple RUs constituting the MRU may be RUs of the same size or RUs of different sizes. For example, a single MRU may be defined as 52+26 tones, 106+26 tones, 484+242 tones, 996+484 tones, 996+484+242 tones, 2Х996+484 tones, 3Х996 tones, or 3Х996+484 tones. Here, the multiple RUs constituting one MRU may correspond to a small-size (e.g., 26, 52, or 106) RU or a large-size (e.g., 242, 484, or 996) RU. That is, one MRU including a small-size RU and a large-size RU may not be configured / defined. In addition, the multiple RUs constituting one MRU may be continuous in the frequency domain, or may not be continuous.

[0127] When an 80 MHz sub-block includes RUs of less than 996 tones or a portion of the 80 MHz sub-block is punctured, the 80 MHz sub-block may use RU allocations other than the 996-tone RUs.

[0128] The RU of the present disclosure may be used for uplink (UL) and / or downlink (DL) communication. For example, when trigger-based UL-MU communication is performed, the STA (e.g., AP) that sends the trigger may allocate a first RU (e.g., 26 / 52 / 106 / 242-RU, etc.) to the first STA through trigger information (e.g., a trigger frame or a triggered response schedule (TRS)), and allocate a second RU (e.g., 26 / 52 / 106 / 242-RU, etc.) to the second STA. Thereafter, the first STA may send a first trigger-based (TB) PPDU based on the first RU, and the second STA may send a second TB PPDU based on the second RU. The first / second TB PPDU may be sent to the AP in the same time period.

[0129] For example, when configuring a DL MU PPDU, the STA (e.g., AP) that transmits the DL MU PPDU may allocate a first RU (e.g., 26 / 52 / 106 / 242-RU, etc.) to the first STA, and allocate a second RU (e.g., 26 / 52 / 106 / 242-RU, etc.) to the second STA. That is, in one MU PPDU, the transmitting STA (e.g., AP) may transmit the HE-STF, HE-LTF, and data fields for the first STA through the first RU, and transmit the HE-STF, HE-LTF, and data fields for the second STA through the second RU.

[0130] Information about RU allocation may be signaled in HE PPDU format via HE-SIG-B.

[0131] Fig.11 An example structure of the HE-SIG-B field is shown.

[0132] As shown, the HE-SIG-B field may include common fields and user-specific fields. If HE-SIG-B compression is applied (e.g., full bandwidth MU-MIMO transmission), the common fields may not be included in the HE-SIG-B, and the HE-SIG-B content channel may include only user-specific fields. If HE-SIG-B compression is not applied, the common fields may be included in the HE-SIG-B.

[0133] The common field may include information about RU allocation (eg, RU assignment, RUs allocated for MU-MIMO, the number of MU-MIMO users (STAs), etc.).

[0134] The common field may include N*8 RU allocation subfields. Here, N is the number of subfields, N = 1 in the case of 20 or 40 MHz MU PPDU, N = 2 in the case of 80 MHz MU PPDU, N = 4 in the case of 160 MHz or 80 + 80 MHz MU PPDU, etc. One 8-bit RU allocation subfield may indicate the size (26, 52, 106, etc.) and frequency position (or RU index) of the RU included in the 20 MHz band.

[0135] For example, if the value of the 8-bit RU Allocation subfield is 00000000, it can indicate Figure 8 In the example, 9 26-RUs are allocated from the leftmost to the rightmost; if the value is 00000001, it can indicate that 7 26-RUs and 1 52-RU are allocated from the leftmost to the rightmost; and if the value is 00000010, it can indicate that 5 26-RUs, 1 52-RU, and 2 26-RUs are allocated from the leftmost to the rightmost.

[0136] As an additional example, if the value of the 8-bit RU Allocation subfield is 01000y2y1y0, it may indicate that Figure 8 In the example of , one 106-RU and five 26-RUs are allocated from the leftmost to the rightmost. In this case, in the MU-MIMO scheme, multiple users / STAs can be allocated to the 106-RU. Specifically, up to 8 users / STAs can be allocated to the 106-RU, and the number of users / STAs allocated to the 106-RU is determined based on the 3-bit information (ie, y2y1y0). For example, when the 3-bit information (y2y1y0) corresponds to the decimal value N, the number of users / STAs allocated to the 106-RU can be N+1.

[0137] Basically, one user / STA can be assigned to each of multiple RUs, and different users / STAs can be assigned to different RUs. For RUs larger than a predetermined size (e.g., 106, 242, 484, 996 tones, ...), multiple users / STAs can be assigned to one RU, and the MU-MIMO scheme can be applied to multiple users / STAs.

[0138] The set of user-specific fields includes information about how all users (STAs) of the corresponding PPDU decode their payloads. The user-specific field may contain zero or more user block fields. The non-end-user block field includes two user fields (ie, information to be used for decoding in two STAs). The end-user block field contains one or two user fields. The number of user fields may be indicated by the RU allocation subfield of the HE-SIG-B, the number of symbols of the HE-SIG-B, or the MU-MIMO user field of the HE-SIG-A. The user-specific field may be encoded separately or independently from the common field.

[0139] Fig.12 is a diagram for explaining a MU-MIMO method in which a plurality of users / STAs are assigned to one RU.

[0140] exist Fig.12 In the example of , assume that the value of the RU allocation subfield is 01000010. This corresponds to the case where y2y1y0 = 010 in 01000y2y1y0. 010 corresponds to 2 in decimal (i.e., N = 2) and may indicate that 3 (= N + 1) users are allocated to one RU. In this case, one 106-RU and five 26-RUs may be allocated sequentially from the leftmost to the rightmost of a specific 20 MHz band / channel. Three users / STAs can be allocated to the 106-RU in MU-MIMO manner. Therefore, a total of 8 users / STAs are allocated to the 20 MHz band / channel, and the user-specific field of the HE-SIG-B may include 8 user fields (i.e., 4 user block fields). Eight user fields may be assigned to a RU, as shown in FIG. Fig.12 shown.

[0141] The user field may be constructed based on two formats. The user field for MU-MIMO allocation may be constructed using a first format, and the user field for non-MU-MIMO allocation may be constructed using a second format. Fig.12 For example, user fields 1 to 3 may be based on a first format, and user fields 4 to 8 may be based on a second format. The first format and the second format may contain bit information of the same length (eg, 21 bits).

[0142] The user field of the first format (ie, the format for MU-MIMO allocation) may be constructed as follows. For example, among all 21 bits of one user field, B0-B10 include identification information of the user (eg, STA-ID, AID, partial AID, etc.), B11-14 include spatial configuration information such as the number of spatial streams for the corresponding user, B15-B18 include modulation and coding scheme (MCS) information applied to the data field of the corresponding PPDU, B19 is defined as a reserved field, and B20 may include information on the coding type (eg, binary convolutional coding (BCC) or low-density parity check (LDPC)) applied to the data field of the corresponding PPDU.

[0143] The user field of the second format (ie, the format for non-MU-MIMO allocation) may be constructed as follows. For example, among all 21 bits of one user field, B0-B10 include identification information of the user (eg, STA-ID, AID, partial AID, etc.), B11-13 include information about the number of spatial streams (NSTS) applied to the corresponding RU, B14 includes information indicating whether beamforming is performed (or whether a beamforming control matrix is ​​applied), B15-B18 include modulation and coding scheme (MCS) information applied to the data field of the corresponding PPDU, B19 includes information indicating whether DCM (dual carrier modulation) is applied, and B20 may include information about the coding type (eg, BCC or LDPC) applied to the data field of the corresponding PPDU.

[0144] The MCS, MCS information, MCS index, MCS field, etc. used in the present disclosure may be indicated by a specific index value. For example, the MCS information may be indicated as index 0 to index 11. The MCS information includes information on the constellation modulation type (e.g., BPSK, QPSK, 16-QAM, 64-QAM, 256-QAM, 1024-QAM, etc.) and the coding rate (e.g., 1 / 2, 2 / 3, 3 / 4, 5 / 6, etc.). Information on the channel coding type (e.g., BCC or LDPC) may be excluded from the MCS information.

[0145] Fig.13 An example of a PPDU format to which the present disclosure can be applied is illustrated.

[0146] Fig.13The PPDU of the present disclosure may be referred to by various names, such as EHT PPDU, transmitted PPDU, received PPDU, first type or Nth type PPDU. For example, the PPDU or EHT PPDU of the present disclosure may be referred to by various names, such as transmitted PPDU, received PPDU, first type or Nth type PPDU. In addition, the EHT PPU may be used in the EHT system and / or a new wireless LAN system in which the EHT system is improved.

[0147] Fig.13 The EHT MU PPDU corresponds to a PPDU that carries one or more data (or PSDU) for one or more users. That is, the EHT MU PPDU can be used for both SU transmission and MU transmission. For example, the EHT MU PPDU can correspond to a PPDU for one receiving STA or multiple receiving STAs.

[0148] exist Fig.13 In the EHT TB PPDU, the EHT-SIG is omitted compared to the EHT MU PPDU. When a trigger (eg, a trigger frame or TRS) for ULMU transmission is received, the STA may perform UL transmission based on the EHT TB PPDU format.

[0149] exist Fig.13 In the example of the EHT PPDU format, L-STF to EHT-LTF correspond to a preamble or a physical preamble and can be generated / transmitted / received / acquired / decoded in a physical layer.

[0150] The subcarrier frequency spacing of the L-STF, L-LTF, L-SIG, RL-SIG, Universal Signal (U-SIG), EHT-SIG fields (these are called pre-EHT modulation fields) can be set to 312.5kHz. The subcarrier frequency spacing of the EHT-STF, EHT-LTF, data, and PE fields (these are called EHT modulation fields) can be set to 78.125kHz. That is, the tone / subcarrier index of the L-STF, L-LTF, L-SIG, RL-SIG, U-SIG, and EHT-SIG fields can be indicated in units of 312.5kHz, and the tone / subcarrier index of the EHT-STF, EHT-LTF, data, and PE fields can be indicated in units of 78.125kHz.

[0151] Fig.13 The L-LTF and L-STF can be used with Figure 6 to Figure 7 The corresponding fields of the PPDU described in are constructed identically.

[0152] Fig.13The L-SIG field may be constructed using 24 bits and may be used to convey rate and length information. For example, the L-SIG field may include a 4-bit rate field, a 1-bit reserved bit, a 12-bit length field, a 1-bit parity field, and a 6-bit tail field. For example, the 12-bit length field may include information about the time duration or length of the PPDU. For example, the value of the 12-bit length field may be determined based on the type of the PPDU. For example, for a non-HT, HT, VHT, or EHT PPDU, the value of the length field may be determined as a multiple of 3. For example, for an HE PPDU, the value of the length field may be determined as a multiple of 3+1 or a multiple of 3+2.

[0153] For example, the transmitting STA may apply BCC encoding based on a coding rate of 1 / 2 to the 24-bit information of the L-SIG field. Thereafter, the transmitting STA may obtain 48-bit BCC-coded bits. BPSK modulation may be applied to the 48-bit coded bits to generate 48 BPSK symbols. The transmitting STA may map the 48 BPSK symbols to any position except the pilot subcarrier (e.g., {subcarrier index -21, -7, +7, +21}) and the DC subcarrier (e.g., {subcarrier index 0}). Thus, the 48 BPSK symbols may be mapped to subcarrier indexes -26 to -22, -20 to -8, -6 to -1, +1 to +6, +8 to +20, and +22 to +26. The transmitting STA may also map the signal of {-1, -1, -1, 1} to the subcarrier index {-28, -27, +27, +28}. The above signal can be used for channel estimation in the frequency domain corresponding to {-28, -27, +27, +28}.

[0154] The transmitting STA may construct the RL-SIG in the same manner as the L-SIG. For the RL-SIG, BPSK modulation is applied. The receiving STA may recognize that the received PPDU is a HE PPDU or an EHT PPDU based on the presence of the RL-SIG.

[0155] exist Fig.13 After the RL-SIG, a universal SIG (U-SIG) may be inserted. The U-SIG may be referred to by various names, such as a first SIG field, a first SIG, a first type SIG, a control signal, a control signal field, and a first (type) control signal.

[0156] The U-SIG may include N bits of information and may include information for identifying the type of the EHT PPDU. For example, the U-SIG may be configured based on two symbols (e.g., two consecutive OFDM symbols). Each symbol (e.g., OFDM symbol) used for the U-SIG may have a duration of 4us, and the U-SIG may have a total duration of 8us. Each symbol of the U-SIG may be used to send 26 bits of information. For example, each symbol of the U-SIG may be sent and received based on 52 data tones and 4 pilot tones.

[0157] Through the U-SIG (or U-SIG field), for example, A-bit information (e.g., 52 uncoded bits) may be transmitted, the first symbol of the U-SIG (e.g., U-SIG-1) may transmit the first X-bit information (e.g., 26 uncoded bits) of the total A-bit information, and the second symbol of the U-SIG (e.g., U-SIG-2) may transmit the remaining Y-bit information (e.g., 26 uncoded bits) of the total A-bit information. For example, the transmitting STA may obtain 26 uncoded bits included in each U-SIG symbol. The transmitting STA may generate 52 coded bits by performing convolution encoding (e.g., BCC encoding) based on a rate of R=1 / 2, and perform interleaving on the 52 coded bits. The transmitting STA may generate 52 BPSK symbols allocated to each U-SIG symbol by performing BPSK modulation on the interleaved 52 coded bits. One U-SIG symbol may be transmitted based on 56 tones (subcarriers) from subcarrier index -28 to subcarrier index +28, excluding DC index 0. The 52 BPSK symbols generated by the transmitting STA may be transmitted based on the remaining tones (subcarriers) except for the pilot tones -21, -7, +7, and +21 tones.

[0158] For example, the A-bit information (e.g., 52 uncoded bits) sent by the U-SIG includes a CRC field (e.g., a 4-bit field) and a tail field (e.g., a 6-bit length field). The CRC field and the tail field can be sent through the second symbol of the U-SIG. The CRC field can be constructed based on the 26 bits of the first symbol allocated to the U-SIG and the remaining 16 bits in the second symbol except the CRC / tail field, and can be constructed based on a conventional CRC calculation algorithm. In addition, the tail field can be used to terminate the grid of the convolutional decoder, and, for example, the tail field can be set to 0.

[0159] The bit information (e.g., 52 uncoded bits) transmitted by the U-SIG (or U-SIG field) may be separated into version-independent bits and version-dependent bits. For example, the size of the version-independent bits may be fixed or variable. For example, the version-independent bits may be allocated only to the first symbol of the U-SIG, or the version-independent bits may be allocated to both the first symbol and the second symbol of the U-SIG. For example, the version-independent bits and the version-dependent bits may be referred to by various names, such as a first control bit and a second control bit, etc.

[0160] For example, the version-independent bit of the U-SIG may include a 3-bit physical layer version identifier (PHY version identifier). For example, the 3-bit PHY version identifier may include information related to the PHY version of the transmitted / received PPDU. For example, the first value of the 3-bit PHY version identifier may indicate that the transmitted / received PPDU is an EHT PPDU. In other words, when transmitting an EHT PPDU, the transmitting STA may set the 3-bit PHY version identifier to a first value. In other words, the receiving STA may determine that the received PPDU is an EHT PPDU based on the PHY version identifier having the first value.

[0161] For example, the version-independent bits of the U-SIG may include a 1-bit UL / DL Flag field. A first value of the 1-bit UL / DL Flag field is associated with UL communication, and a second value of the UL / DL Flag field is associated with DL communication.

[0162] For example, the version independent bits of the U-SIG may include information about the length of a transmission opportunity (TXOP) and information about a BSS color ID.

[0163] For example, if the EHT PPDU is classified into various types (e.g., EHT PPDU associated with SU mode, EHT PPDU associated with MU mode, EHT PPDU associated with TB mode, EHT PPDU associated with extended range transmission, etc.), information about the EHT PPDU type may be included in the version-dependent bit of the U-SIG.

[0164] For example, the U-SIG may include the following information: 1) a bandwidth field containing information about the bandwidth, 2) a field containing information about the MCS scheme applied to the EHT-SIG, 3) an indication field containing information related to whether the DCM technology is applied to the EHT-SIG, 4) a field containing information on the number of symbols used for the EHT-SIG, 5) a field containing information on whether the EHT-SIG is constructed over all bands, 6) a field containing information on the type of EHT-LTF / STF, and 7) a field indicating the length of the EHT-LTF and the CP length.

[0165] The leading hole can be applied to Fig.13 Preamble puncturing means that puncturing is applied to some bands (e.g., the secondary 20 MHz band) among the entire band of the PPDU. For example, when sending an 80 MHz PPDU, the STA may apply puncturing to the secondary 20 MHz band in the 80 MHz band, and may send the PPDU only through the primary 20 MHz band and the secondary 40 MHz band.

[0166] For example, the pattern of the leading puncture may be set in advance. For example, when the first puncture pattern is applied, the puncture may be applied only to the auxiliary 20 MHz band within the 80 MHz band. For example, when the second puncture pattern is applied, the puncture may be applied only to one of the two auxiliary 20 MHz bands included in the auxiliary 40 MHz band within the 80 MHz band. For example, when the third puncture pattern is applied, the puncture may be applied only to the auxiliary 20 MHz band included in the main 80 MHz band within the 160 MHz band (or the 80+80 MHz band). For example, when the fourth puncture pattern is applied, within the 160 MHz band (or the 80+80 MHz band), there is a main 40 MHz band included in the main 80 MHz band, and the puncture may be applied to at least one 20 MHz channel that does not belong to the main 40 MHz band.

[0167] Information about the preamble puncturing applied to the PPDU may be included in the U-SIG and / or the EHT-SIG. For example, the first field of the U-SIG may include information about the continuous bandwidth of the PPDU, and the second field of the U-SIG may include information about the preamble puncturing applied to the PPDU.

[0168] For example, the U-SIG and the EHT-SIG may include information about the preamble puncture based on the following method. If the bandwidth of the PPDU exceeds 80 MHz, the U-SIG can be constructed separately in units of 80 MHz. For example, if the bandwidth of the PPDU is 160 MHz, the PPDU may include a first U-SIG for a first 80 MHz band and a second U-SIG for a second 80 MHz band. In this case, the first field of the first U-SIG includes information about the 160 MHz bandwidth, and the second field of the first U-SIG includes information about the preamble puncture applied to the first 80 MHz band (ie, information about the preamble puncture pattern). In addition, the first field of the second U-SIG includes information about the 160 MHz bandwidth, and the second field of the second U-SIG includes information about the preamble puncture applied to the second 80 MHz band (ie, information about the preamble puncture pattern). The EHT-SIG following the first U-SIG may include information about preamble puncturing applied to the second 80 MHz band (ie, information about the preamble puncturing pattern), and the EHT-SIG following the second U-SIG may include information about preamble puncturing applied to the first 80 MHz band (ie, information about the preamble puncturing pattern).

[0169] Additionally or alternatively, the U-SIG and the EHT-SIG may include information about preamble puncturing based on the following method. The U-SIG may include information about preamble puncturing for all bands (ie, information about preamble puncturing patterns). That is, the EHT-SIG does not include information about preamble puncturing, and only the U-SIG may include information about preamble puncturing (ie, information about preamble puncturing patterns).

[0170] The U-SIG can be constructed in units of 20 MHz. For example, if an 80 MHz PPDU is constructed, the U-SIG may be repeated. That is, the same 4 U-SIGs may be included in the 80 MHz PPDU. A PPDU with a bandwidth exceeding 80 MHz may include different U-SIGs.

[0171] Fig.13 The EHT-SIG may include control information for receiving STAs. The EHT-SIG may be transmitted through at least one symbol, and one symbol may have a length of 4us. Information on the number of symbols used for the EHT-SIG may be included in the U-SIG.

[0172] EHT-SIG may include Fig.11 and Fig.12 The technical features of HE-SIG-B described in Figure 8As in the example of , the EHT-SIG may include a common field and a user-specific field. The common field of the EHT-SIG may be omitted, and the number of user-specific fields may be determined based on the number of users.

[0173] like Fig.11 As shown in the example of , the common field of EHT-SIG and the user-specific field of EHT-SIG can be compiled separately. One user block field included in the user-specific field may include information for two user fields, but the last user block field included in the user-specific field may include one or two user fields. That is, one user block field of EHT-SIG may include up to two user fields. Fig.12 As shown in the example of , each user field can be associated with a MU-MIMO allocation or a non-MU-MIMO allocation.

[0174] and Fig.11 Same as the example of , the common field of the EHT-SIG may include CRC bits and tail bits, the length of the CRC bits may be determined as 4 bits, and the length of the tail bits may be determined by 6 bits and may be set to 000000.

[0175] As in Fig.11 In an example of , the common field of the EHT-SIG may include RU allocation information. The RU allocation information may mean information about the locations of RUs to which multiple users (ie, multiple receiving STAs) are allocated. The RU allocation information may be configured in units of 9 bits (or N bits).

[0176] A mode in which the common field of the EHT-SIG is omitted may be supported. The mode in which the common field of the EHT-SIG is omitted may be referred to as a compressed mode. When the compressed mode is used, multiple users of the EHT PPDU (i.e., multiple receiving STAs) may decode the PPDU (e.g., the data field of the PPDU) based on non-OFDMA. That is, multiple users of the EHT PPDU may decode the PPDU (e.g., the data field of the PPDU) received via the same frequency band. When the non-compressed mode is used, multiple users of the EHT PPDU may decode the PPDU (e.g., the data field of the PPDU) based on OFDMA. That is, multiple users of the EHT PPDU may receive the PPDU (e.g., the data field of the PPDU) via different frequency bands.

[0177] The EHT-SIG can be constructed based on various MCS schemes. As described above, information related to the MCS scheme applied to the EHT-SIG can be included in the U-SIG. The EHT-SIG can be constructed based on the DCM scheme. The DCM scheme can reuse the same signal on two subcarriers to provide an effect similar to frequency diversity, reduce interference and improve coverage. For example, modulation symbols applying the same modulation scheme can be repeatedly mapped to available tones / subcarriers. For example, a modulation symbol (e.g., a BPSK modulation symbol) applying a specific modulation scheme can be mapped to the first continuous half tone (e.g., the 1st to the 26th tone) among the N data tones (e.g., 52 data tones) allocated to the EHT-SIG, and a modulation symbol (e.g., a BPSK modulation symbol) applying the same specific modulation scheme is mapped to the remaining continuous half tones (e.g., the 27th to the 52nd tone). That is, the modulation symbol mapped to the 1st tone and the modulation symbol mapped to the 27th tone are the same. As described above, information related to whether the DCM scheme is applied to the EHT-SIG (eg, a 1-bit field) may be included in the U-SIG. Fig.13 The EHT-STF can be used to enhance the automatic gain control (AGC) estimation in a MIMO environment or an OFDMA environment. Fig.13 The EHT-LTF can be used to estimate the channel in a MIMO environment or an OFDMA environment.

[0178] Information about the type of STF and / or LTF (including information about a guard interval (GI) applied to LTF) may be included in Fig.13 The U-SIG field and / or EHT-SIG field of the RFID tag may be used.

[0179] Fig.13 The PPDU (ie, EHT PPDU) can be based on Figures 8 to 10 An example of RU allocation is constructed.

[0180] For example, an EHT PPDU transmitted in a 20 MHz band, that is, a 20 MHz EHT PPDU may be based on Figure 8 That is, the RU positions of the EHT-STF, EHT-LTF and data fields included in the EHT PPDU can be as follows: Figure 8 The EHT PPDU sent in the 40MHz band, that is, the 40MHz EHT PPDU can be determined based on Fig. 9 That is, the RU positions of the EHT-STF, EHT-LTF and data fields included in the EHT PPDU may be as follows: Fig. 9 shown is determined.

[0181] The EHT PPDU sent in the 80 MHz band, that is, the 80 MHz EHT PPDU can be based on Fig.10 That is, the RU positions of the EHT-STF, EHT-LTF and data fields included in the EHT PPDU can be as follows: Fig.10 shown is determined. Fig.10 The tone plan for 80 MHz in may correspond to Fig. 9 Two repetitions of the tone plan for 40 MHz.

[0182] The tone plan for 160 / 240 / 320MHz can be repeated Fig. 9 Or 10 patterns are configured several times.

[0183] Based on the following method Fig.13 The PPDU is identified as EHT PPDU.

[0184] The receiving STA may determine the type of the received PPDU as an EHT PPDU based on the following. For example, when 1) the first symbol after the L-LTF signal of the received PPDU is BPSK, 2) an RL-SIG in which the L-SIG of the received PPDU is repeated is detected, and 3) the result of applying the modulo 3 calculation to the value of the length field of the L-SIG of the received PPDU (i.e., the remainder after division by 3) is detected as 0, the received PPDU may be determined to be an EHT PPDU. When determining that the received PPDU is an EHT PPDU, the receiving STA may determine the type of the received PPDU as an EHT PPDU based on the following Fig.13 In other words, the receiving STA can determine the type of the EHT PPDU based on 1) the first symbol after the L-LTF signal as the BSPK, 2) the RL-SIG is adjacent to the L-SIG field and is the same as the L-SIG, and 3) the L-SIG including the length field in which the result of applying modulo 3 is set to 0.

[0185] For example, the receiving STA may determine the type of the received PPDU as the HE PPDU according to the following. For example, when 1) the first symbol after the L-LTF signal is BPSK, 2) the RL-SIG repeating the L-SIG is detected, and 3) the result of applying modulo 3 to the length value of the L-SIG is detected to be 1 or 2, the received PPDU may be determined as the HE PPDU.

[0186] For example, the receiving STA may determine the type of the received PPDU as non-HT, HT, and VHT PPDU based on the following: For example, when 1) the first symbol after the L-LTF signal is BPSK and 2) the RL-SIG in which the L-SIG is repeated is not detected, the received PPDU may be determined as non-HT, HT, and VHT PPDU.

[0187] Fig.13 The PPDU can be used to send and receive various types of frames. For example, Fig.13 The PPDU can be used to (simultaneously) send and receive one or more of control frames, management frames, or data frames.

[0188] Trigger Frame

[0189] Fig.14 is a diagram illustrating an example format of a trigger frame to which the present disclosure may be applied.

[0190] The trigger frame may allocate resources for transmission of one or more TB PPDUs and request transmission of a TB PPDU. The trigger frame may also include other information required by the STA, which sends a TB PPDU in response.

[0191] Fig.14 (a) exemplarily shows an HE variant trigger frame. The trigger frame may include a common information field and a user information list field in the frame body.

[0192] Fig.14 The common information field shown as an example in (b) may include information that is generally applied to the transmission of one or more TB PPDUs requested by the trigger frame, such as the trigger type, UL length, the presence of subsequent trigger frames (e.g., more TFs), whether CS (channel sensing) is required, UL BW (bandwidth), etc.

[0193] For example, the encoding of the trigger type subfield indicating the trigger type may be implemented as shown in Table 1 below, but is not limited thereto.

[0194]

Table 1

[0195]

[0196] A user info list includes zero or more user info fields. Fig.14(c) exemplarily shows the format of the HE variant user information field. For example, the user information field may include an AID12 subfield, an RU allocation subfield, a UL FEC coding type subfield, a trigger-related user field, etc. The RU allocation subfield may indicate the size and location of the RU / MRU. To this end, the RU allocation subfield may be interpreted together with the PS160 (primary / secondary 160 MHz) subfield of the user information field and the UL BW subfield of the common information field.

[0197] Fig.14 (d) exemplarily shows the trigger-related user information field on the basic trigger frame. The MPDU MU interval factor subfield may be used to calculate a value to be multiplied by the minimum MPDU start interval. The TID aggregation limit subfield may indicate the maximum number of MPDUs allowed in an A-MPDU that a STA may carry in an HE TB PPDU and the maximum number of TIDs aggregated in the A-MPDU. The preferred AC subfield may indicate the minimum AC recommended for MPDU consolidation of the A-MPDU included in the HE TB PPDU sent in response to the trigger frame.

[0198] Probe Protocol Sequence

[0199] like Fig.15 As shown in (a), the HE non-trigger (non-TB) based sounding sequence is initiated by the HE beamformer (HEbeamformer) using a single addressed HE NDP announcement frame including a STA information field, and after SIFS, the HE sounding NDP may be sent to the (single) HE beamformee (HE beamformee). The HE beamformee may receive the HE sounding NDP from the HE beamformer and, after SIFS, respond by sending a HE compressed beamforming / CQI frame to the HE beamformer.

[0200] If the STA identified by the RA (Receiver Address) field is a mesh STA, AP, or IBSS STA, the AID11 subfield of the STA Information field may be set to 0 or the AID of the STA identified by the RA field of the HE NDP Announcement frame.

[0201] Specifically, a HE beamformer that initiates a HE non-TB sounding sequence must send a HE NDP announcement frame with a single STA Information (Info) field, and if the STA identified by the RA field is a mesh STA, AP, or IBSS member STA, the AID11 field value of the corresponding STA Information field may be set to 0 or the AID of the STA identified by the RA field instead of 2047. The HE beamformer may initiate a HE non-TB sounding sequence with the HE beamsetter to request SU feedback across the entire bandwidth. The HE beamformer may not initiate HE non-TB using a HE NDP announcement frame with a partial BW information subfield indicating less than the full bandwidth.

[0202] like Fig.15 As shown in (b) of FIG. 1 , the HE TB sounding sequence may be initiated by a HE beamformer, a HE sounding NDP after SIFS, and a BFRP trigger frame after SIFS, using a broadcast HE NDP announcement frame with two or more STA information fields. One or more HE beamformers may receive the BFPR trigger frame and respond with a HE compressed beamforming / CQI frame after SIFS. Here, the BFRQ trigger frame may include one or more user info fields identifying the HE beamformer.

[0203] The HE beamformer that starts the HE TB sounding sequence may send a HE NDP announcement frame including two or more STA information fields and a RA field set to the broadcast address. The HE beamformer may initiate the HE TB sounding sequence to request MU feedback across the entire bandwidth.

[0204] The HE beamformer may initiate a HE TB sounding sequence to request feedback variables only if the feedback variables are calculated based on parameters supported by the HE beamformer. Otherwise, the HE beamformer may not request feedback variables calculated based on parameters not supported by the HE beamformer.

[0205] A HE beamformer that sends a HE NDP announcement frame to a HE beam receiver that is an AP TDLS peer STA, mesh STA, or IBSS STA may include a STA information (info) field in the HE NDP announcement frame and set the AID11 field to 0 in the STA information field of the frame.

[0206] A HE beamformer that acts as an AP and sends a HE NDP announcement frame to one or more HE beamformers may set the AID11 field of the STA information field identifying the non-AP STA to the 11 LSB of the AID of the non-AP STA. The HE NDP announcement frame may not include multiple STA information fields with the same value in the AID11 subfield.

[0207] The HE beamformer that sends the HE NDP announcement frame to start the HE TB sounding sequence may include the STA Information field with the AID11 subfield value of 2047 to indicate that subchannels are not allowed during the punctured channel operation. If the STA Information field is present, the STA Information field with the AID11 value of 2047 may be the first STA Information field of the frame. The HE beamformer that sends the HE NDP announcement frame may not include one or more STA Information fields with the AID11 subfield value of 2047.

[0208] like Fig.15 As shown in (b) of FIG. 1 , the HE beamformer that initiates the HE TB sounding sequence may send another BFRP trigger frame in the same TXOP. The HE beamformer may, initiated by the HE beamsetter, use an additional BFRP trigger frame to request HE compressed beamforming / CQI reports that were not processed in the previous BFRP trigger frame, or to request retransmission of HE compressed beamforming / CQI reports. The HE beamformer may not send a BFRP trigger frame for the STA identified in the HE NDP announcement frame identifying the HE TB sounding sequence unless it is in the same TXOP as the HE TB sounding sequence.

[0209] In the HE TB sounding sequence, the STA Information field in the HE NDP announcement frame requesting SU or MU feedback may indicate the subcarrier grouping (Ng), codebook size, and number of columns (Nc) to be used by the HE beam receiver identified by the STA Information field to generate SU or MU feedback. Also, in the HE TB sounding sequence, the STA Information field of the HE NDP announcement frame requesting CQI feedback may indicate Nc to be used by the HE beam receiver identified by the STA Information field to generate CQI feedback.

[0210] In addition, the trigger-related common information subfield may not exist in the BFRQ trigger frame. The trigger-related user information subfield of the BFRQ trigger frame may indicate feedback segment retransmission, and the bitmap subfield may indicate the requested feedback segment of the HE compressed beamforming report.

[0211] If the bit at position n (n=0 for LSB, n=7 for MSB) in the subfield is 1, then the remaining feedback fragments subfield of the HE MIMO Control field with n feedback fragments may be requested. If the bit at position n in the subfield is 0, then the remaining feedback fragments subfield of the HE MIMO Control field with n feedback fragments may be requested.

[0212] Wireless LAN (WLAN) Sensing Process

[0213] The sensing process refers to a process of obtaining information about the surrounding environment based on information about the channel environment (or state) included in the signal transmitted from the transmitter to the receiver. Each STA can provide additional services that can be applied in various forms in real life based on the information about the surrounding environment acquired through the sensing process.

[0214] Here, the information about the surrounding environment may include, for example, gesture recognition information, fall detection information, intrusion detection information, user motion detection, health monitoring information, or pet motion detection.

[0215] The sensing process may consist of at least one of a sensing session setup phase, a sensing measurement setup phase, a sensing measurement instance phase, a sensing measurement setup termination phase, and a sensing session termination phase.

[0216] Here, a sensing session may be defined as a period of receiving / measuring a sensing signal after the sensing signal is transmitted, and may consist of one or more sensing measurement instances.

[0217] A sensing session may consist of multiple subsessions, each of which may include a measurement phase and a reporting phase. Here, a subsession may be expressed as a sensing burst, a (sensing) measurement instance, or a measurement burst.

[0218] A STA that initiates a sensing process by transmitting a sensing measurement setup request frame or the like may be referred to as a sensing initiator, and a STA that participates in a sensing process (or a sensing session) in response to the sensing initiator may be referred to as a sensing responder.

[0219] The role of the STA that initiates the sensing process or participates in the sensing process can be a sensing transmitter and / or a sensing receiver. The sensing transmitter refers to the STA that sends the PPDU for measurement in the sensing process, and the sensing receiver refers to the STA that receives the PPDU received from the sensing transmitter in the sensing process and obtains the measurement result based on it.

[0220] Operation of TB (Trigger-Based) Sensing Process

[0221] A TB sensing measurement instance may be defined as performing a sensing measurement (or channel measurement) during a sensing process. A TB sensing measurement may consist of a TF (ie, trigger frame) probing phase and a NDPA (NDP announcement) probing phase.

[0222] Here, the TF detection phase used in the TB sensing measurement example can be configured as follows Fig.16 Specifically, the TF detection phase can be configured as an operation in which an AP (e.g., a sensing initiator / receiver) sends a trigger frame to request NDP transmission from one or more STAs (e.g., a sensing responder / transmitter), and an operation in which one or more STAs receive the trigger frame and send NDP after SIFS.

[0223] That is, the sensing initiator may request NDP frame transmission to one or more sensing responders participating in the sensing measurement through a trigger frame. The NDP frame may be transmitted through an OFDMA transmission scheme or a MU-MIMO transmission scheme.

[0224] Additionally or alternatively, if Fig.16 As shown in (b), the sensing responders participating in the sensing process that receive the trigger frame may sequentially send NDPs. That is, one or more sensing responders may sequentially send NDPs to the sensing initiator at SIFS intervals.

[0225] Here, one or more sensing responders may receive information from the sensing initiator regarding the order in which they transmit the NDP via the trigger frame. Fig.16 The NDP illustrated in (b) can be sent by one or more sensing responders through a BW indicated via a trigger frame.

[0226] The NDPA detection phase used within the TB sensing measurement instance can be as follows Fig.16 The NDPA detection phase may be configured as a phase in which the AP sends a sensing NDP announcement frame and a phase in which the AP sends a sensing NDP announcement frame and sends an NDP after a SIFS.

[0227] Here, the NDPA detection phase may also be used by the STA before the HE STA. That is, the NDPA detection phase may be performed by the pre-HE STA as well as the HE STA or / and the EHT STA.

[0228] In this disclosure, it is assumed that Fig.16 In (a), (b) and (c) of FIG. 1 , the STA that sends the trigger frame / NDP announcement frame is the AP. However, this is just an example, and a non-AP STA may also send a trigger frame / NDP announcement frame.

[0229] As an example of the present disclosure, Fig.17 Configuration shown is an example of a TB sensing measurement.

[0230] For example, a TF probing process (or phase), such as TB sensing measurement instance 1, may be performed after sending and receiving a polling frame.

[0231] As another example, such as TB sensing measurement instance 2, after sending and receiving the polling frame, the TF detection process and the NDP announcement frame detection process (or phase) can be performed.

[0232] As another example, a detection process based on an NDP announcement frame, such as TB sensing measurement instance 3, may be performed after sending and receiving a polling frame.

[0233] As another example, such as TB sensing measurement instance 4, after sending and receiving the polling frame, the NDP announcement frame detection process and the TF detection process can be performed.

[0234] exist Fig.17 In each TB sensing measurement example illustrated in , the reporting phase is omitted and may be performed after TF detection / NDPA detection.

[0235] And, in addition to Fig.17 In addition to the example of the TB sensing measurement instance illustrated in FIG. 1 , various types of TB sensing measurement instances may be configured. That is, the TB sensing measurement instance may be configured according to various combinations of the TF detection phase and the NDPA detection phase.

[0236] That is, configuration information for a TB sensing measurement instance and / or configuration information for a probing phase can be sent from a sensing initiator to a sensing responder via a sensing measurement setup phase.

[0237] Hereinafter, when channel measurement is performed using a TB sensing measurement instance, a method of indicating information on a probe constituting a TB sensing measurement through a sensing measurement setting phase as a sensing responder is described.

[0238] For a basic wireless LAN system, the operation of a sensing initiator instructing a sensing responder about the type of a sensing measurement instance and the configuration of the sensing measurement instance in a sensing measurement setup phase, and the operation of a sensing responder performing sensing measurement on the sensing measurement instance according to the indicated information, have not yet been defined.

[0239] That is, the present disclosure describes a method for enabling a sensing responder to perform efficient sensing measurements by having a sensing initiator instruct a sensing responder on the type and configuration of measurement instances.

[0240] Fig.18 is a diagram for describing a process in which a first STA performs sensing measurement according to one embodiment of the present disclosure.

[0241] exist Fig.18 and 19 In the embodiment, the first STA may be a sensing responder, and the second STA may be a sensing initiator, but is not limited thereto. Fig.18 and 19 In the embodiment, the first STA may be a non-AP STA, and the second STA may be an AP, but is not limited thereto.

[0242] The first STA may receive a sensing measurement setup request frame including a sensing measurement parameter element from the second STA ( S1810 ).

[0243] Here, the sensing measurement parameter element may include i) first information indicating whether the sensing measurement instance is a triggered sensing measurement instance or a non-TB sensing measurement instance; and ii) second information indicating configuration of the sensing measurement instance based on the first information.

[0244] For example, the first information may be indicated by a first field (eg, a sub-element ID field) included in the sensing measurement parameter element.

[0245] If the first field is a sub-element ID field, the sub-element ID field may be included in a sensing sub-element field included in the sensing measurement parameter element.

[0246] For example, based on the first field value being set to 0, the first field may indicate that the sensing measurement instance is a non-TB sensing measurement instance. And based on the first field value being set to 1, the first field may indicate that the sensing measurement instance is a TB sensing measurement instance.

[0247] And, based on the first field value being set to 0, the second information may indicate the configuration of the non-TB sensing measurement instance. Based on the first field value being set to 1, the second information may indicate the configuration of the TB sensing measurement instance.

[0248] For example, a TB sensing measurement instance may include at least one of a polling phase, a TF probing phase, an NDPA (ie, NDP announcement frame) probing phase, or a reporting phase.

[0249] That is, the configuration of the TB measurement instance can be directed to a combination of at least one of the polling phase, the TF detection phase, the NDPA detection phase, or the reporting phase through the second information.

[0250] As an example of the present disclosure, second information indicating the configuration of a TB sensing measurement instance may be indicated by a second field (e.g., 2 bits) included in a sensing measurement parameter element, and second information indicating the configuration of a non-TB sensing measurement instance may be indicated by a third field (e.g., 2 bits) included in the sensing measurement parameter element.

[0251] However, this is merely one embodiment, and the second information indicating the configuration of the TB / non-TB sensing measurement instance may also be indicated by a single field (eg, 3 bits).

[0252] In addition, the sensing measurement parameter element may include a sensing measurement parameter field. The sensing measurement parameter field may include information indicating whether the role of the first STA is a sensing transmitter or a sensing receiver.

[0253] The first STA may transmit a sensing measurement setup response frame to the second STA in response to the measurement setup request frame ( S1820 ).

[0254] As an example, the sensing measurement setup response frame may include information indicating configuration of the sensing measurement instance requested by the second STA or the first STA.

[0255] That is, if the configuration of the sensing measurement instance indicated by the second information of the sensing measurement setup request frame is accepted, the first STA may send the sensing measurement setup response frame including the second information to the second STA as it is.

[0256] As another example, if the configuration of the sensing measurement instance indicated by the second information of the sensing measurement setup request frame is accepted, the first STA may transmit a sensing measurement setup response frame including information indicating acceptance of the configuration of the sensing measurement instance to the second STA.

[0257] As another example, if the configuration of the sensing measurement instance indicated by the second information of the sensing measurement setup request frame is not accepted, the first STA may send a sensing measurement setup response frame including information indicating the configuration of the sensing measurement instance requested by the first STA to the second STA.

[0258] The first STA may perform sensing measurement in the sensing measurement instance based on the sensing measurement parameter element ( S1830 ).

[0259] Specifically, if the configuration of the sensing measurement instance indicated by the second information of the sensing measurement setting request frame is accepted, the first STA may perform the sensing measurement on the indicated sensing measurement instance.

[0260] As another example, if the configuration of the sensing measurement instance indicated by the second information of the sensing measurement setting request frame is not accepted, the first STA may perform sensing measurement based on the configuration of the sensing measurement instance requested by it or the configuration of the sensing measurement instance agreed with the second STA.

[0261] For example, if the second information indicates a configuration of a TB sensing measurement instance including a TF probing phase, the first STA may send an NDP to the second STA using a bandwidth (BW) indicated via a trigger frame.

[0262] Additionally or alternatively, it is assumed that a trigger frame is sent from the second STA to a plurality of STAs (i.e., a plurality of sensing responders) including the first STA. In this case, the trigger frame may include information about the order in which each of the plurality of STAs sends an NDP. The first STA may send an NDP to the second STA according to the information about the order.

[0263] Fig.18 The trigger frame described in the example of (ie, the sensing trigger frame sent from the TB sensing measurement instance) can be implemented as Fig.14 As an example, the trigger-related public information subfield of the sensing trigger frame may include a sensing trigger subtype field, a sensing subtype field, and a token field.

[0264] and, Fig.18 The NDP described in the example can be based on Figure 6 , Figure 7 or Fig.13 For example, the NDP sent by the first STA or / and the second STA may be configured in the following format: Figure 6 , Figure 7 or Fig.13 However, this is only one embodiment, and the NDP sent by the first STA or / and the second STA may be configured based on PPDUs of different formats.

[0265] Fig.18 The method performed by the first STA described in the example may be performed by Figure 1 The first device (100) performs. For example, Figure 1 One or more processors (102) of a first device (100) may be configured to receive a sensing measurement setup request frame from one or more STAs (e.g., a second STA) (200) via one or more transceivers (106). And, the one or more processors (102) may be configured to send a sensing measurement setup response frame to the one or more STAs (200). The one or more processors (102) may perform sensing measurement based on a sensing measurement parameter element included in the sensing measurement setup request frame.

[0266] In addition, the one or more memories (104) of the first device (100) may store instructions for executing, when executed by the one or more processors (102), Fig.18 The method described in the example.

[0267] Fig.19 is a diagram for explaining a process in which a second STA performs sensing measurement according to one embodiment of the present disclosure.

[0268] The second STA may send a sensing measurement setting request frame including a sensing measurement parameter element to the first STA (S1910). The configuration of the sensing measurement setting request frame has been referred to in Fig.18 Description has been made, so duplicate description will be omitted.

[0269] For example, the second STA may send a sensing measurement setup request frame to one or more sensing responders including the first STA. The second STA may send a sensing measurement setup request frame to one or more sensing responders in a broadcast manner and an OFDMA manner.

[0270] The second STA may receive a sensing measurement setup response frame in response to the measurement setup request frame from the first STA ( S1920 ).

[0271] For example, the sensing measurement setup response frame may include the same information as the information related to the configuration of the sensing measurement instance indicated via the sensing measurement setup request frame. However, this is merely an embodiment, and the sensing measurement setup response frame may include information related to the sensing measurement instance requested by the first STA.

[0272] The second STA may receive a sensing measurement setup response frame from one or more sensing responders including the first STA.

[0273] The second STA may perform sensing measurement in the sensing measurement instance based on the sensing measurement parameter element ( S1930 ).

[0274] For example, if the sensing measurement instance is a TB sensing measurement instance, the second STA may send at least one of a polling frame, a trigger frame, or an NDP announcement frame to at least one STA including the first STA (ie, one or more sensing responders that have performed the sensing measurement setup phase).

[0275] The second STA may send or receive an NDP to at least one STA based on at least one of a polling frame, a trigger frame, or an NDP announcement frame. The second STA may receive a sensing measurement result for the NDP from at least one STA.

[0276] Fig.19 The method performed by the second STA described in the example may be performed by Figure 1 The second device (200) executes. For example, Figure 1The one or more processors (202) of the second device (200) may be configured to send a sensing measurement setup request frame to one or more STAs including the first STA via one or more transceivers (206). The one or more processors (202) may be configured to receive the sensing measurement setup request frame from the one or more STAs including the first STA via the one or more transceivers (206). And, the one or more processors (202) may be configured to perform sensing measurement based on the sensing measurement parameter element included in the sensing measurement setup request frame.

[0277] In addition, the one or more memories (204) of the second device (200) may store instructions for executing, when executed by the one or more processors (202), Fig.19 The method described in the example.

[0278] Hereinafter, an operation of the sensing initiator instructing the sensing responder about the configuration information of the TB measurement instance will be described in more detail.

[0279] Example 1

[0280] Embodiment 1 relates to a sensing measurement setup phase for performing a sensing measurement.

[0281] like Fig. 20 As shown in FIG. 1 , in the sensing measurement setup step, a sensing measurement setup request / response frame can be exchanged between the sensing initiator and the sensing responder.

[0282] Specifically, the sensing initiator may send a sensing measurement setup request frame to the sensing responder in the sensing measurement setup phase. That is, the sensing initiator may send the sensing measurement setup request frame to the sensing responder so as to perform sensing measurement with the sensing responder.

[0283] Here, the sensing measurement setup request frame may include information about sensing measurement parameters for performing sensing measurement. As an example, the sensing measurement parameters may include configuration information about TB sensing support and TB sensing measurement instance.

[0284] Here, the sensing responder (eg, non-AP STSA) having received the sensing measurement setup request frame including the sensing measurement parameter may transmit a sensing measurement setup response frame including whether the sensing measurement parameter is allowed to the sensing initiator (eg, AP).

[0285] Example 1-1

[0286] Embodiment 1-1 relates to a configuration of a sensing measurement parameter element included in a sensing measurement setup request frame and a method for indicating information about a TB sensing measurement through the sensing measurement parameter element.

[0287] Specifically, the sensing initiator may send information about the TB sensing measurement to one or more sensing responders via a sensing measurement parameter element included in a sensing measurement setup request frame.

[0288] The sensing measurement parameter element included in the sensing measurement setup request frame may be as follows: Fig.21 Specifically, the sensing measurement setting request frame may include an element ID field, a length field, an element ID extension field, a sensing measurement information field, and a sensing measurement parameter field.

[0289] For example, the sensing measurement parameter element may include a sensing measurement information field consisting of 1 octet. The sensing measurement information field may be positioned before the sensing measurement parameter field on the sensing measurement parameter element.

[0290] However, this is only one embodiment, and the sensing measurement information field may be located after the sensing measurement parameter field on the sensing measurement parameter element. That is, the location of the sensing measurement information field on the sensing measurement parameter element may be implemented in various ways.

[0291] For example, the sensing measurement information field may include a TB support (sub)field and a sensing measurement configuration (sub)field.

[0292] The TB support field may include information indicating whether the sensing measurement instance is a TB sensing measurement instance or a non-TB sensing measurement instance. The TB support field may also be expressed as a trigger support field, etc., or may be expressed with other names.

[0293] For example, the TB support field may consist of 1 bit. For example, when the TB support field value is set to 1 (or 0), this may indicate that the sensing measurement instance is a TB sensing measurement instance. As another example, when the TB support field value is set to 0 (or 1), this may indicate that the sensing measurement instance is a non-TB sensing measurement instance.

[0294] The sensing measurement configuration field may indicate configuration information for a sensing measurement instance.

[0295] The information indicated by the Sensing Measurement Configuration field may vary depending on the setting of the TB Support field. That is, the Sensing Measurement Configuration field may indicate different information depending on the value setting of the TB Support field.

[0296] For example, when the TB Support field value is set to 1, the Sensing Measurement Configuration field can indicate the configuration of the TB sensing measurement instance. When the Sensing Measurement Configuration field consists of 2 bits, the Sensing Measurement Configuration field can be configured as shown in Table 2.

[0297]

Table 2

[0298]

[0299] However, Table 2 is only an example, and the value (or bit) indicated by the sensing measurement configuration field and the corresponding content may be set differently. As another example, if the TB support field value is set to 0, the sensing measurement configuration field may indicate the configuration of the non-TB sensing measurement instance. If the sensing measurement configuration field is configured with 2 bits, the sensing measurement configuration field may be configured as shown in Table 3.

[0300]

Table 3

[0301]

[0302] However, Table 3 is only an example, and the value (or bit) indicated by the sensing measurement configuration field and the corresponding content may be set differently. As an example of the present disclosure, the sensing measurement configuration field may have bits of different sizes, as well as 2 bits. As an example, the sensing measurement configuration field may have 3 bits, and may include all information according to Table 2 and Table 3. If the sensing measurement configuration field is configured with 3 bits, the sensing measurement configuration field may be configured as shown in Table 4.

[0303]

Table 4

[0304]

[0305] Here, if the TB support value is set to 1, the value of the sensing measurement configuration field may be set to one of 0 to 3. And, if the TB support value is set to 0, the value of the sensing measurement configuration field may be set to one of 4 to 6. However, Table 4 is only one embodiment, and the value (or bit) indicated by the sensing measurement configuration field and the corresponding content may be set differently.

[0306] Example 1-2

[0307] Embodiments 1-2 relate to a method for transmitting information on TB sensing measurement through a sensing measurement parameter field of a sensing measurement parameter element included in a configuration of a sensing measurement setting request frame and a sensing measurement parameter element.

[0308] Specifically, the sensing measurement parameter field in the sensing measurement parameter element included in the sensing measurement setup request frame may be as follows: Fig.21 The configuration is shown in (b).

[0309] For example, the sensing measurement parameter field may include at least one of a sensing transmitter subfield, a sensing receiver subfield, a sensing measurement report subfield, a measurement report type subfield, a TB support field, a sensing measurement configuration subfield, or a delay support subfield.

[0310] The Sensing Transmitter subfield may indicate whether the role of the sensing responder is a sensing transmitter. The Sensing Receiver subfield may indicate whether the role of the sensing responder is a sensing receiver. The Sensing Measurement Report subfield may indicate whether a sensing measurement report frame is transmitted.

[0311] The TB support field may include information indicating whether the sensing measurement instance is a TB sensing measurement instance or a non-TB sensing measurement instance. The TB support field may also be expressed as a trigger support field, etc., or may be expressed with other names.

[0312] For example, the TB support field may consist of 1 bit. For example, if the TB support field value is set to 1 (or 0), it may indicate that the sensing measurement instance is a TB sensing measurement instance. As another example, if the TB support field value is set to 0 (or 1), this may indicate that the sensing measurement instance is a non-TB sensing measurement instance.

[0313] The sensing measurement configuration field may indicate configuration information for a sensing measurement instance. The sensing measurement configuration field may be set to a specific bit among the sensing measurement parameter field.

[0314] Depending on the setting of the TB Support field, the information indicated by the Sensing Measurement Configuration field may vary. That is, the Sensing Measurement Configuration field may indicate different information depending on the value setting of the TB Support field.

[0315] For example, when the TB Support field value is set to 1, the Sensing Measurement Configuration field may indicate the configuration of the TB sensing measurement instance. When the Sensing Measurement Configuration field consists of 2 bits, the Sensing Measurement Configuration field may be configured as shown in Table 2.

[0316] However, Table 2 is only an example, and the value (or bit) indicated by the sensing measurement configuration field and the corresponding content may be set differently.

[0317] As another example, when the TB Support field value is set to 0, the Sensing Measurement Configuration field may indicate the configuration of a non-TB sensing measurement instance. When the Sensing Measurement Configuration field consists of 2 bits, the Sensing Measurement Configuration field may be configured as shown in Table 3.

[0318] However, Table 3 is only an example, and the value (or bit) indicated by the sensing measurement configuration field and the corresponding content may be set differently.

[0319] As an example of the present disclosure, the sensing measurement configuration field may have bits of different sizes, not just 2 bits. As an example, the sensing measurement configuration field may have 3 bits and may include all information according to Table 2 and Table 3. When the sensing measurement configuration field is configured with 3 bits, the sensing measurement configuration field may be configured as shown in Table 4.

[0320] Here, when the TB support value is set to 1, the value of the sensing measurement configuration field can be set to one of 0 to 3. And, when the TB support value is set to 0, the value of the sensing measurement configuration field can be set to one of 4 to 6.

[0321] However, Table 4 is only an example, and the value (or bit) indicated by the Sensing Measurement Configuration field and the corresponding content may be set differently.

[0322] Examples 1-3

[0323] Embodiments 1-3 relate to the configuration of a sensing measurement setup response frame.

[0324] The configuration information for the sensing measurement instance included in the sensing measurement setup request frame described in Embodiments 1-1 and 1-2 may also be included in the sensing measurement setup response frame.

[0325] That is, as described in Embodiment 1-1 and Embodiment 1-2, configuration information for a sensing measurement instance may be transmitted through a sensing measurement parameter element included in a sensing measurement setup response frame or a sensing measurement parameter field included in a sensing measurement parameter element.

[0326] Configuration information for the sensing measurement instance carried in the sensing measurement setup response frame may be the same as the information sent through the sensing measurement setup request frame.

[0327] Additionally or alternatively, the configuration information for the sensing measurement instance carried in the sensing measurement setup response frame may include configuration information for the sensing measurement instance requested by the sensing responder. That is, the sensing responder may reject the configuration information for the sensing measurement instance included in the sensing measurement setup response frame and send the configuration information for the sensing measurement instance requested by the sensing responder.

[0328] The above-mentioned embodiments are elements and features of the present disclosure combined in a predetermined form. Unless otherwise explicitly mentioned, each element or feature should be considered optional. Each element or feature can be implemented in a form that is not combined with other elements or features. In addition, the embodiments of the present disclosure may include combined partial elements and / or features. The order of the operations described in the embodiments of the present disclosure may be changed. Some elements or features of an embodiment may be included in other embodiments, or may be replaced by corresponding elements or features of other embodiments. It is clear that an embodiment may include a combined claim without an explicit dependency in the claim, or may be included as a new claim by modification after application.

[0329] It is clear to those skilled in the art that the present disclosure can be implemented in other specific forms within the scope of the essential features of the present disclosure. Therefore, the above detailed description should not be interpreted restrictively in every aspect, but should be considered as illustrative. The scope of the present invention should be determined by the reasonable interpretation of the attached claims, and all changes within the equivalent scope of the present disclosure are included in the scope of the present invention.

[0330] The scope of the present disclosure includes software or machine executable commands (e.g., operating systems, applications, firmware, programs, etc.) that perform operations in a device or computer according to the methods of various embodiments, and non-transitory computer-readable media that store such software or commands, etc. and can be executed in a device or computer. Commands that can be used to program a processing system that performs the features described in the present disclosure can be stored in a storage medium or a computer-readable storage medium, and the features described in the present disclosure can be implemented by using a computer program product that includes such a storage medium. The storage medium may include a high-speed random access memory, such as DRAM, SRAM, DDR RAM, or other random access solid-state storage devices, but is not limited thereto, and it may include non-volatile memory, such as one or more magnetic disk storage devices, optical disk storage devices, flash memory devices, or other non-volatile solid-state storage devices. The memory optionally includes one or more storage devices located away from the processor. The memory or alternatively, the non-volatile memory device in the memory includes a non-transitory computer-readable storage medium. The features described in this disclosure may be stored in any machine-readable medium to control the hardware of a processing system, and may be integrated into software and / or firmware that allows the processing system to interact with other mechanisms using the results from embodiments of the present disclosure. Such software or firmware may include, but is not limited to, application code, device drivers, operating systems, and execution environments / containers.

[0331] [Industrial Applicability]

[0332] The method proposed by the present disclosure is mainly described based on an example of being applied to an IEEE 802.11-based system and a 5G system, but can also be applied to various WLAN or wireless communication systems other than the IEEE 802.11-based system.

Claims

1. A method for performing sensing measurements by a first station (STA) in a wireless LAN system, the method comprising: receiving, from the second STA, a sensing measurement setup request frame including a sensing measurement parameter element; In response to the measurement setup request frame, sending a sensing measurement setup response frame to the second STA; as well as performing a sensing measurement in a sensing measurement instance based on the sensing measurement parameter element, The sensing measurement parameter element includes i) first information indicating whether the sensing measurement instance is a TB (trigger-based) sensing measurement instance or a non-TB sensing measurement instance, and ii) second information indicating configuration of the sensing measurement instance based on the first information.

2. The method according to claim 1, wherein: The first information is indicated by a first field included in the sensing measurement parameter element, Based on the first field value being set to 0, the sensing measurement instance is indicated by the first field as the non-TB sensing measurement instance, and Based on the first field value being set to 1, the sensing measurement instance is indicated by the first field as the TB sensing measurement instance.

3. The method according to claim 2, wherein: Based on the first field value being set to 0, the configuration of the non-TB sensing measurement instance is indicated by the second information, Based on the first field value being set to 1, the configuration of the TB sensing measurement instance is indicated by the second information.

4. The method according to claim 2, wherein: The TB sensing measurement instance includes at least one of a polling phase, a trigger frame (TF) detection phase, a null data physical protocol data unit (PPDU) (NDP) announcement detection phase, or a reporting phase.

5. The method according to claim 1, wherein: The sensing measurement setup response frame includes information indicating configuration of the sensing measurement instance requested by the second STA or the first STA.

6. The method according to claim 3, wherein: The second information indicating the configuration of the TB sensing measurement instance is indicated by a second field included in the sensing measurement parameter element, and The second information indicating the configuration of the non-TB sensing measurement instance is indicated by a third field included in the sensing measurement parameter element.

7. The method according to claim 1, wherein: The sensing measurement parameter element includes a sensing measurement parameter field, and The sensing measurement parameter field includes information indicating whether a role of the first STA is a sensing transmitter or a sensing receiver.

8. The method according to claim 4, wherein: Based on a trigger frame received from the second STA during the TF probing phase, an NDP is sent to the second STA in a bandwidth (BW) indicated by the trigger frame.

9. The method according to claim 8, wherein: Based on transmitting the trigger frame from the second STA to a plurality of STAs including the first STA, the trigger frame includes information on an order in which each of the plurality of STAs transmits the NDP.

10. The method according to claim 9, wherein: The plurality of STAs are non-AP (Access Point) STAs, and The second STA is an AP.

11. The method according to claim 1, wherein: The first STA is a sensing responder, and The second STA is a sensing initiator.

12. A first station (STA) for performing sensing measurement in a wireless LAN system, the first STA comprising: at least one transceiver; as well as at least one processor connected to the at least one transceiver, Wherein, the at least one processor is configured to: receiving, by the at least one transceiver, a sensing measurement setup request frame including a sensing measurement parameter element from a second STA; In response to the measurement setup request frame, sending a sensing measurement setup response frame to the second STA through the at least one transceiver; and performing a sensing measurement in a sensing measurement instance based on the sensing measurement parameter element, The sensing measurement parameter element includes i) first information indicating whether the sensing measurement instance is a TB (trigger-based) sensing measurement instance or a non-TB sensing measurement instance, and ii) second information indicating configuration of the sensing measurement instance based on the first information.

13. A method for performing sensing measurements by a second station (STA) in a wireless LAN system, the method comprising: Sending a sensing measurement setup request frame including a sensing measurement parameter element to the first STA; receiving, from the first STA, a sensing measurement setup response frame in response to the measurement setup request frame; as well as performing a sensing measurement in a sensing measurement instance based on the sensing measurement parameter element, The sensing measurement parameter element includes i) first information indicating whether the sensing measurement instance is a TB (trigger-based) sensing measurement instance or a non-TB sensing measurement instance, and ii) second information indicating configuration of the sensing measurement instance based on the first information.

14. A second station (STA) for performing sensing measurement in a wireless LAN system, the second STA comprising: at least one transceiver; as well as at least one processor connected to the at least one transceiver, Wherein, the at least one processor is configured to: sending, by the at least one transceiver, a sensing measurement setup request frame including a sensing measurement parameter element to the first STA; receiving, by the at least one transceiver, a sensing measurement setup response frame in response to the measurement setup request frame from the first STA; and performing a sensing measurement in a sensing measurement instance based on the sensing measurement parameter element, The sensing measurement parameter element includes i) first information indicating whether the sensing measurement instance is a TB (trigger-based) sensing measurement instance or a non-TB sensing measurement instance, and ii) second information indicating configuration of the sensing measurement instance based on the first information.

15. A processing device, the processing device being configured to control a first station (STA) to perform sensing measurements in a wireless LAN system, the processing device comprising: at least one processor; as well as At least one computer memory operably connected to the at least one processor and storing instructions that upon execution by the at least one processor perform operations comprising: receiving, from the second STA, a sensing measurement setup request frame including a sensing measurement parameter element; In response to the measurement setup request frame, sending a sensing measurement setup response frame to the second STA; as well as performing a sensing measurement in a sensing measurement instance based on the sensing measurement parameter element, The sensing measurement parameter element includes i) first information indicating whether the sensing measurement instance is a TB (trigger-based) sensing measurement instance or a non-TB sensing measurement instance, and ii) second information indicating configuration of the sensing measurement instance based on the first information.

16. At least one non-transitory computer-readable medium storing at least one instruction, in, The at least one instruction executable by the at least one processor controls a device performing sensing measurements in a wireless LAN system to: receiving, from the second STA, a sensing measurement setup request frame including a sensing measurement parameter element; In response to the measurement setup request frame, sending a sensing measurement setup response frame to the second STA; and performing a sensing measurement in a sensing measurement instance based on the sensing measurement parameter element, The sensing measurement parameter element includes i) first information indicating whether the sensing measurement instance is a TB (trigger-based) sensing measurement instance or a non-TB sensing measurement instance, and ii) second information indicating configuration of the sensing measurement instance based on the first information.

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