Method and apparatus for transmitting and receiving PPDU based on trigger frame in wireless LAN system

Abstract

Disclosed are a method and apparatus for transmitting and receiving a PPDU based on a trigger frame in a wireless LAN system. A method performed by a station (STA) in a wireless LAN system according to an embodiment of the present disclosure may comprise the steps of: receiving a trigger frame including a user information field (user info field) from an access point (AP); and transmitting a trigger-based (TB) physical layer protocol data unit (PPDU) triggered by the trigger frame to the AP. Here, the user information field may include first information and second information related to the channel indication, each of the first information and the second information may be composed of one-bit information, and the first information and the second information may be composed of one-bit information based on a bandwidth for the STA that is greater than 320 MHz. A combination of the first information and the second information may indicate a location of a channel to which resources for the TB PPDU have been allocated within a bandwidth exceeding 320 MHz.

Description

Technical Field

[0001] The present disclosure relates to a method and apparatus for transmitting or receiving a physical layer protocol data unit (PPDU) based on a trigger frame in a wireless local area network (WLAN) system. Background Art

[0002] New technologies have been introduced for wireless LAN (WLAN) to increase 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 the Very High Throughput (VHT) enhancements of the 802.11ac standard and the High Efficiency (HE) enhancements of the IEEE 802.11ax standard.

[0003] In order to provide a further improved wireless communication environment, improved technologies for extremely high throughput (EHT) are being discussed. For example, technologies supporting multiple-input multiple-output (MIMO) and multiple access point (AP) coordination of increased bandwidth, efficient use of multiple frequency bands, and increased spatial streams are being studied, and specifically, various technologies for supporting services with low latency or real-time characteristics are being studied. In addition, new technologies are being discussed to support ultra-high reliability (UHR), including improvements or extensions to EHT technologies. Summary of the invention

[0004] Technical issues

[0005] The technical object of the present disclosure is to provide a method and apparatus for transmitting or receiving a physical layer protocol data unit (PPDU) based on a trigger frame in a wireless LAN system.

[0006] A technical object of the present disclosure is to provide a method and apparatus for indicating resource allocation information by considering an extended bandwidth when a trigger-based (TB) PPDU is triggered based on a trigger frame.

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

[0008] Technical Solution

[0009] A method performed by a station (STA) in a wireless LAN system according to an aspect of the present disclosure may include: receiving a trigger frame including a user information field from an access point (AP); and sending a trigger-based physical layer protocol data unit (TB PPDU) triggered by the trigger frame to the AP. Here, the user information field may include first information and second information related to channel indication, each of the first information and the second information may be composed of 1-bit information, and based on the bandwidth for the STA exceeding 320 MHz, the combination of the first information and the second information may indicate the location of the channel to which the resources for the TB PPDU are allocated within the bandwidth exceeding 320 MHz.

[0010] According to another aspect of the present disclosure, a method performed by an access point (AP) in a wireless LAN system may include: sending a trigger frame including a user information field to a station (STA); and receiving a trigger-based physical layer protocol data unit (TB PPDU) triggered by the trigger frame from the STA. Here, the user information field may include first information and second information related to channel indication, each of the first information and the second information may be composed of 1-bit information, and based on the bandwidth for the STA exceeding 320 MHz, the combination of the first information and the second information may indicate the location of the channel to which the resources for the TB PPDU are allocated within the bandwidth exceeding 320 MHz.

[0011] Beneficial Effects

[0012] According to the present disclosure, a method and apparatus for allocating resource units in a wireless LAN system may be provided.

[0013] According to the present disclosure, a method and apparatus for indicating resource allocation information by considering an extended bandwidth when a trigger-based (TB) PPDU is triggered based on a trigger frame may be provided.

[0014] According to the present disclosure, resource units (RUs) and / or multiple resource units (MRUs) existing within an extended bandwidth may be efficiently allocated to non-AP STAs, thereby improving UL transmission efficiency and throughput.

[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 relevant art through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are included as a part of the detailed description to assist in understanding the present disclosure, provide embodiments of the present disclosure and describe technical features of the present disclosure together with the detailed description.

[0017] Figure 1 A configuration block 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 It is a diagram for explaining a link establishment process to which the present disclosure can be applied.

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

[0021] Figure 5 It is a diagram for explaining a frame transmission operation based on CSMA / CA 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 illustrated.

[0026] Fig.12 It is a diagram for explaining the 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 example format of a trigger frame to which the present disclosure may be applied.

[0029] Fig.15 An example of a user field of a trigger frame considering extended BW support according to an embodiment of the present disclosure is illustrated.

[0030] Fig.16 Another example of a user field of a trigger frame considering extended BW support according to an embodiment of the present disclosure is illustrated.

[0031] Fig.17 is a flowchart for illustrating the operation of a STA based on a trigger frame according to the present disclosure.

[0032] Fig.18 is a flowchart for illustrating the operation of an AP based on a trigger frame according to the present disclosure. DETAILED DESCRIPTION

[0033] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. The detailed description 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 know that the present disclosure can be implemented without these specific details.

[0034] 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 of the concepts of the present disclosure.

[0035] 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.

[0036] In the present disclosure, 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 elements, etc. 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.

[0037] 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".

[0038] Examples of the present disclosure can be applied to various wireless communication systems. For example, examples of the present disclosure can be applied to wireless LAN systems. For example, examples of the present disclosure can be applied to wireless LANs based on IEEE 802.11a / g / n / ac / ax standards. In addition, examples of the present disclosure can be applied to wireless LANs based on the newly proposed IEEE 802.11be (or EHT) standard. Examples of the present disclosure can be applied to wireless LANs based on the IEEE802.11be version 2 standard corresponding to the additional enhanced technology of the IEEE 802.11be version 1 standard. In addition, examples of the present disclosure can be applied to wireless LANs based on next-generation standards after IEEE 802.11be. In addition, examples of the present disclosure can be applied to cellular wireless communication systems. For example, it can be applied to cellular wireless communication systems based on long term evolution (LTE) technology and 5G new radio (NR) technology based on the third generation partnership project (3GPP) standard.

[0039] Hereinafter, technical features of examples to which the present disclosure can be applied will be described.

[0040] Figure 1 A block diagram of a wireless communication device according to an embodiment of the present disclosure is illustrated.

[0041] Figure 1 The first device 100 and the second device 200 illustrated in the figure may be replaced with 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 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 with various terms such as an artificial intelligence (AI) system, a roadside unit (RSU), a repeater, a router, a relay and a gateway.

[0042] Figure 1 The devices 100 and 200 illustrated in the example may be referred to as stations (STAs). 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, STA110 and 200 may perform the functions of an AP and / or a non-AP. When STA110 and 200 perform an AP function, they may be simply referred to as an AP, and when STA110 and 200 perform a non-AP function, they may be simply referred to as a STA. In addition, in the present disclosure, an AP may also be indicated as an AP STA.

[0043] Reference Figure 1 , the first device 100 and the second device 200 can send and receive radio signals through various wireless LAN technologies (e.g., 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) that conform to the IEEE802.11 standard.

[0044] In addition, in addition to the wireless LAN technology, the first device 100 and the second device 200 may further support various communication standards (e.g., 3GPP LTE series, 5G NR series standards, etc.) technologies. 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, and virtual reality (VR) devices. 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.

[0045] 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 descriptions, functions, processes, suggestions, methods, and / or operational flowcharts included 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 codes including instructions for executing all or part of the processing controlled by the processor 102 or for executing the descriptions, functions, processes, suggestions, methods, and / or operational flowcharts included 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., IEEE 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 wireless device may refer to a communication modem / circuit / chip.

[0046] 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 descriptions, functions, processes, suggestions, methods, and / or operation flowcharts included in the present disclosure. For example, the processor 202 may generate third information / signals 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 / signals through the transceiver 206, and then store 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 codes including instructions for executing all or part of the processing controlled by the processor 202 or for executing the descriptions, functions, processes, suggestions, methods, and / or operation flowcharts included 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.

[0047] In the following, the hardware elements of the apparatus 100, 200 will be described in more detail. Without limitation thereto, 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, suggestion, 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, suggestion, 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, suggestions, and / or methods disclosed in the present disclosure to provide them to one or more transceivers 106, 206. One or more processors 102, 202 may receive a signal (e.g., a baseband signal) from one or more transceivers 106, 206 according to the descriptions, functions, processes, suggestions, methods, and / or operational flow charts included in the present disclosure and obtain a PDU, SDU, message, control information, data, or information.

[0048] 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. For 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, suggestions, methods, and / or operational flow charts 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, and the like. Firmware or software configured to execute the descriptions, functions, processes, suggestions, methods, and / or operational flow charts 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, suggestions, methods and / or operational flow charts included in the present disclosure may be implemented using firmware or software in the form of codes, instructions and / or instruction sets.

[0049] 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 various technologies such as wired or wireless connections.

[0050] One or more transceivers 106, 206 may send user data, control information, wireless signals / channels, etc. mentioned in the method and / or operation flow chart 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 description, function, process, suggestion, method and / or operation flow chart, 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, suggestions, methods and / or operation flow charts, etc. included in the present disclosure through one or more antennas 108, 208. In the present disclosure, one or more antennas may be multiple physical antennas or more logical antennas (e.g., antenna ports). One or more transceivers 106, 206 may convert received wireless signals / channels, etc. from RF band signals into baseband signals to process received user data, control information, wireless signals / channels, etc. by using one or more processors 102, 202. 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 into RF band signals. Thus, one or more of the transceivers 106 , 206 may include (analog) oscillators and / or filters.

[0051] For example, one of the STAs 100 and 200 may perform the expected operation of an AP, and the other of the STAs 100 and 200 may perform the expected 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 of various STAs generating transmission / reception signals or performing data processing or calculations on transmission / reception signals in advance may be performed by Figure 1The processors 102 and 202 are executed. For example, examples of operations of generating a transmit / receive signal or performing data processing or calculation for a 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) 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 example, various information used by various STAs to determine / acquire / configure / calculate / decode / encode transmission signals 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.

[0052] Hereinafter, a 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.

[0053] Figure 2 is a diagram illustrating an exemplary structure of a wireless LAN system to which the present disclosure can be applied.

[0054] The structure of the wireless LAN system may be composed of a plurality of components. A wireless LAN supporting STA mobility transparent to an upper layer may be provided through the interaction of the plurality of 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 (STA1 and STA2 are included in BSS1, and STA3 and STA4 are included in BSS2) are included as members of each BSS. Figure 2The ellipse representing the BSS in the figure can also be understood as representing the coverage area in which the STAs included in the corresponding BSS maintain communication. This area can be called a basic service area (BSA). When a STA moves outside the BSA, it cannot communicate directly with other STAs in the BSA.

[0055] If you don't consider Figure 2 , the most basic BSS type in the wireless LAN is an independent BSS (IBSS), if the DS is shown in FIG. 1 . For example, an IBSS may have a minimum form containing only two STAs. For example, assuming that other components are omitted, a BSS1 containing only STA1 and STA2 or a 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 pre-configured but can be configured when a LAN is needed, and this may be referred to as an ad-hoc network. Since 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 the IBSS, all STAs may be composed of mobile STAs, and access to the distributed system (DS) is not allowed, thereby forming a self-contained network.

[0056] 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. In order 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 associate with the BSS. This association can be established dynamically and can include the use of a distributed system service (DSS).

[0057] 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 longer distances may be required. A distributed system (DS) can be configured to support extended coverage.

[0058] DS refers to the structure of BSS interconnection. Specifically, Figure 2As shown, 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 a distributed system medium (DSM). In this regard, the wireless medium (WM) and the DSM can be logically separated. Each logical medium is used for different purposes and is used by different components. These media are not limited to being the same, nor are they limited to being different. In this way, the flexibility of the wireless LAN structure (DS structure or other network structure) can be interpreted as multiple media being logically different. 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 implementation.

[0059] DS can support mobile devices by providing seamless integration of multiple BSSs and providing logical services necessary to address the address leading to the destination. In addition, DS can also include a component called a portal, which is used as a bridge for connection between wireless LAN and other networks (e.g., IEEE 802.X).

[0060] The AP enables access to the DS through the WM for associated non-AP STAs and means an entity that also has STA functionality. Data movement between the BSS and the DS can be performed through the AP. For example, Figure 2 STA2 and STA3 shown in the figure have the function of STA and provide the function of allowing the associated non-AP STA (STA1 and STA4) to access the DS. In addition, since all APs basically correspond to STAs, all APs are addressable entities. The address used by the AP to communicate on the WM is not necessarily the same as the address used by the AP to communicate on the DSM. A BSS composed of an AP and one or more STAs may be referred to as an infrastructure BSS.

[0061] Data sent from one of the STAs associated with the AP to the STA address of the corresponding AP can always be received at the uncontrolled port and can be processed by the IEEE 802.1X port access entity. In addition, when the controlled port is authenticated, the transmitted data (or frame) can be delivered to the DS.

[0062] In addition to the above-mentioned structure of the DS, an extended service set (ESS) may also be configured to provide wide coverage.

[0063] ESS means a network with arbitrary size and complexity consisting 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. The STAs included in the ESS can communicate with each other, and the mobile STA can move from one BSS to another (within the same ESS) transparently for LLC. The APs included in one ESS may have the same service set identifier (SSID). SSID is distinguished from BSSID, which is an identifier of BSS.

[0064] 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 on 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 than one) IBSS or ESS network may physically exist in the same space as one (or more than one) ESS network. 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 may correspond to the form of an ESS network, etc.

[0065] Figure 3 is a diagram for explaining a link establishment process to which the present disclosure can be applied.

[0066] 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 authentication processing for security. The link establishment processing may also be referred to as a session initiation processing or a session establishment processing. In addition, the discovery, authentication, association, and security establishment processing of the link establishment processing may be collectively referred to as an association processing.

[0067] 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 a 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 present in a specific area is called scanning.

[0068] Scanning schemes include active scanning and passive scanning. Figure 3The network discovery operation including active scanning processing is exemplarily illustrated. In active scanning, the STA performing the scan sends a probe request frame to discover which APs exist around it while the channel moves and waits for a response thereto. The responder sends a probe response frame as a response to the probe request frame to the STA that has sent the probe request frame. Here, the responder may be the STA that last sent a beacon frame in the BSS of the channel being scanned. In the BSS, since the AP sends a beacon frame, the AP becomes the responder, and in the IBSS, the STAs in the IBSS rotate to send 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., sending and receiving probe requests / responses on channel 2).

[0069] Although not in Figure 3 , but 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 the channel moves. The beacon frame is one of the management frames defined in IEEE 802.11, and is periodically sent 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 periodically send beacon frames, and in the IBSS, the STAs within the IBSS rotate to send beacon frames. When the STA performing the scan receives the beacon frame, the STA stores the information of 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 with passive scanning, the advantage of active scanning is that it has less delay and less power consumption than passive scanning.

[0070] After the STA discovers the network, an authentication process may be performed at step S320. In order to clearly distinguish from the security establishment operation of step S340 to be described later, this authentication process may be referred to as a first authentication process.

[0071] The authentication process includes the following process: 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.

[0072] The authentication frame includes an authentication algorithm number, an authentication transaction sequence number, a status code, a challenge text, a robust security network (RSN), 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 additional information can also be included.

[0073] 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 via an authentication response frame.

[0074] After the STA is successfully authenticated, an association process may be performed at step S330. The association process includes the following processes: the STA sends an association request frame to the AP, and in response, the AP sends an association response frame to the STA.

[0075] For example, the association request frame may include information related to various capabilities, a beacon listening interval, a service set identifier (SSID), supported rates, supported channels, RSN, a mobile domain, supported operation categories, a 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, a status code, an association ID (AID), supported rates, an enhanced distributed channel access (EDCA) parameter set, a received channel power indicator (RCPI), a received signal-to-noise ratio indicator (RSNI), a mobile domain, a timeout interval (e.g., an association recovery time), an overlapping BSS scanning parameter, a TIM broadcast response, a quality of service (QoS) map, etc. This corresponds to some examples of information that may be included in an association request / response frame, and may be replaced with other information, or additional information may also be included.

[0076] After the STA successfully associates with the network, a security establishment process may be performed at step S340. The security establishment process at step S340 may be referred to as an authentication process through a robust security network association (RSNA) request / response, the authentication process at step S320 may be referred to as a first authentication process, and the security establishment process at step S340 may also be referred to simply as an authentication process.

[0077] The security establishment process of step S340 may include, for example, a process of establishing a private key through an Extensible Authentication Protocol over LAN (EAPOL) frame using a four-way handshake. In addition, the security establishment process may be performed according to a security scheme not defined in the IEEE 802.11 standard.

[0078] Figure 4 It is a diagram for explaining a backoff process to which the present disclosure can be applied.

[0079] In a wireless LAN system, the basic access mechanism of the medium access control (MAC) is a carrier sense multiple access with collision avoidance (CSMA / CA) mechanism. The CSMA / CA mechanism is also known as 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, before starting to send, the AP and / or STA may perform a clear channel assessment (CCA) of sensing the radio channel or medium during a predetermined time interval (e.g., DCF interframe space (DIFS)). 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 access may be set and frame transmission may be attempted after waiting. By applying a random backoff period, since multiple STAs are expected to attempt frame transmission after waiting for different time periods, conflicts can be minimized.

[0080] 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 synchronous access method based on polling, 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 that provides data frames to multiple users in a direction, and HCCA uses a non-contention-based channel access method that utilizes a polling mechanism. In addition, HCF includes a medium access mechanism for improving the QoS (quality of service) of a wireless LAN, and QoS data can be sent during a contention period (CP) and a contention-free period (CFP).

[0081] Reference Figure 4, the operation based on the random backoff period will be described. When the occupied / busy medium becomes idle, multiple STAs may attempt to send data (or frames). As a method of minimizing conflicts, each of the STAs may select a random backoff count respectively and attempt to send after waiting for the corresponding time slot time. The random backoff count has a pseudo-random integer value and may be determined as one of the values ​​ranging from 0 to CW. Here, CW is a contention window parameter value. The CW parameter is assigned CWmin as an initial value, but may take a value twice as large in the event of a transmission failure (e.g., when an ACK for a transmitted frame is not received). When the CW parameter value reaches CWmax, data transmission may 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, ...).

[0082] When the random backoff process starts, the STA continuously monitors the medium in the backoff slot countdown according to the determined backoff count value. When the medium is monitored for occupancy, it stops the countdown and waits, and restarts the remaining part of the countdown when the medium becomes idle.

[0083] exist Figure 4 In the example of , when the packet to be sent arrives at the MAC of STA 3, STA3 can send the frame immediately after confirming that the medium has been idle for up to DIFS. The remaining STAs monitor and wait for the medium to be occupied / busy. At the same time, the data to be sent can also occur in each of STA1, STA2 and STA5, and when the medium is monitored as idle, each STA waits for up to DIFS, and then the countdown of the backoff slot can be performed 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 example illustrates the case where the remaining backoff time of STA5 is shorter than the remaining backoff time of STA1 when STA2 completes the backoff count and starts frame transmission. STA1 and STA5 temporarily stop the countdown and wait when STA2 occupies the medium. When STA2's occupation ends and the medium becomes idle again, STA1 and STA5 wait for DIFS and restart the stopped backoff count. That is, frame transmission can start after counting down the remaining backoff slot for the remaining backoff time. Since the remaining backoff time of STA5 is shorter than that of STA1, STA5 starts frame transmission. The data to be transmitted may also occur in STA4 while STA2 occupies the medium. From the perspective of STA4, when the medium becomes idle, STA4 may wait for DIFS, and then may perform a countdown according to a random backoff count value selected by STA4, and start transmitting frames. Figure 4The example shows a case where the remaining backoff time of STA5 accidentally collides 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. While the medium is occupied due to the transmission of STA4 and STA5, STA1 waits, and when the medium becomes idle, STA1 waits DIFS, and then starts frame transmission after the remaining backoff time has passed.

[0084] As in Figure 4 In the example of , a data frame is a frame for sending data forwarded to a higher layer, and may be sent after a backoff performed after DIFS has passed since the medium became 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 a backoff is performed after an IFS such as DIFS or a point coordination function IFS (PIFS). As subtype frames of the management frame, there are beacons, association requests / responses, reassociation requests / responses, probe requests / responses, authentication requests / 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 trigger, and the like. If the control frame is not a response frame of the previous frame, it is sent after a backoff is performed after DIFS has passed, and if it is a response frame of the previous frame, it is sent without performing a backoff after a short IFS (SIFS). The type and subtype of a frame may be identified by the type field and subtype field in the frame control (FC) field.

[0085] Quality of Service (QoS) STA can perform a backoff performed after arbitration IFS (AIFS) (i.e., AIFS (where i is a value determined by AC)) for the access category (AC) to which the frame belongs, and then can send the frame. Here, the frame that can use AIFS may be a data frame, a management frame, or a control frame instead of a response frame.

[0086] Figure 5 is a diagram for explaining a frame transmission operation based on CSMA / CA to which the present disclosure can be applied.

[0087] As described above, in addition to the physical carrier sensing in which the STA directly senses the medium, the CSMA / CA mechanism also includes virtual carrier sensing. Virtual carrier sensing is intended to compensate for problems such as hidden node problems that may occur in medium access. For virtual carrier sensing, the MAC of the STA 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 during which the STA sending the frame plans to use the medium, and during the corresponding period, the STA receiving the NAV value is prohibited from accessing the medium. For example, the NAV can be configured based on the value of the "Duration" field of the MAC header of the frame.

[0088] 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 be able to eavesdrop on some or all frames sent and received between STA1 and STA2.

[0089] In order to reduce the possibility of transmission conflicts among multiple STAs in the frame transmission operation based on CSMA / CA, a mechanism using RTS / CTS frames can be applied. Figure 5 In the example of , when 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 with respect to STA3. Alternatively, in 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 being performed. That is, STA2 may correspond to a hidden node with respect to STA3. By exchanging RTS / CTS frames before performing 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 of the transmission from STA1 or STA3 may not attempt to occupy the channel during data transmission and reception between STA1 and STA2.

[0090] Specifically, STA1 can determine whether the channel is being used by 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.

[0091] When the channel is in an idle state 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 as a response to the RTS frame after SIFS.

[0092] 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 frame transmission period (e.g., SIFS+CTS frame+SIFS+data frame+SIFS+ACK frame) that is continuously transmitted thereafter using the duration information included in the RTS frame. Alternatively, if STA3 can eavesdrop on the CTS frame from STA2, STA3 can set the NAV timer for the frame transmission period (e.g., SIFS+data frame+SIFS+ACK frame) that is continuously transmitted thereafter using the duration information included in the CTS frame even though STA3 cannot eavesdrop on the RTS frame from STA1. That is, if STA3 can eavesdrop on one or more of the RTS frame or the CTS frame 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 until the NAV timer expires.

[0093] When STA1 receives a CTS frame from STA2, STA1 may send a data frame to STA2 after SIFS, starting 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 after SIFS as a response to the data frame. When the NAV timer expires, STA3 may determine whether the channel is being used by carrier sensing. When STA3 determines that the channel is not being used by other terminals during the DIFS period after the NAV timer expires, STA3 may attempt channel access after the contention window (CW) according to the random backoff has passed.

[0094] 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.

[0095] With the help of instructions or primitives (meaning a set of instructions or parameters) from the MAC layer, the PHY layer can prepare a MAC PDU (MPDU) to be transmitted. For example, when a command requesting the PHY layer to start transmitting is received from the MAC layer, the PHY layer switches to a transmission mode, and configures information (e.g., data) provided from the MAC layer in the form of a frame and transmits it. In addition, when the PHY layer detects a valid preamble of a received frame, the PHY layer monitors the header of the preamble and transmits a command notifying the start of reception of the PHY layer to the MAC layer.

[0096] In this manner, information transmission / reception in the wireless LAN system is performed in the form of frames, and for this purpose, a PHY layer protocol data unit (PPDU) frame format is defined.

[0097] 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), a SIG field, and a 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 (to be referred to later). Figure 7 Describe this).

[0098] 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 can be called signals for synchronization and channel estimation of the OFDM physical layer.

[0099] The SIG field may include a rate field and a length field, etc. 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.

[0100] The data field may include a service (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.

[0101] 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 may consist of a MAC PDU and be transmitted / received through a PSDU of a data portion of a PPDU frame format.

[0102] 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 details of the sequence control, QoS control, and HT control subfields of the MAC header, refer to the IEEE 802.11 standard document.

[0103] 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 (i.e., STF, LTF, and SIG fields) in a common PPDU frame format and does not include the remaining portion (i.e., data field). The NDP frame may also be referred to as a short frame format.

[0104] 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.

[0105] 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.

[0106] The HT PPDU format (IEEE 802.11n) additionally includes HT-SIG, HT-STF, and HT-LFT fields with respect to the basic PPDU format. Figure 7 The HT PPDU format shown in the figure 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 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).

[0107] An example of a VHT PPDU format (IEEE 802.11ac) additionally includes VHT SIG-A, VHT-STF, VHT-LTF, and VHT-SIG-B fields for the basic PPDU format.

[0108] Examples of HE PPDU formats (IEEE 802.11ax) additionally include repeated L-SIG (RL-SIG), HE-SIG-A, HE-SIG-B, HE-STF, HE-LTF, and packet extension (PE) fields with respect to the basic PPDU format. According to the detailed examples 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), while the HE-SIG-B is not included in the HE PPDU format for single user (SU). In addition, the PPDU format based on 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.

[0109] 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.

[0110] Reference 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, an RU may be used. In addition, an RU may be defined even when a signal is transmitted to one STA. An RU may be used for a data field, an STF, an LTF, etc. of a PPDU.

[0111] like Figures 8 to 10 As shown in , 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 may be allocated in RU units as shown for the X-STF, X-LTF, and data fields.

[0112] Figure 8 is a diagram illustrating exemplary allocation of resource units (RUs) used on a 20 MHz frequency band.

[0113] like Figure 8As shown at the top of , 26-units (i.e., units corresponding to 26 tones) may be allocated. 6 tones may be used as a guard band in the leftmost band of the 20 MHz band, and 5 tones may be used as a guard band in the rightmost band of the 20 MHz band. In addition, 7 DC tones are inserted into the center band (that is, the DC band), and 26-units corresponding to each of the 13 tones may exist on the left and right sides of the DC band. In addition, 26-units, 52-units, and 106-units may be allocated to other bands. Each unit may be allocated for STA or user.

[0114] Figure 8 The RU allocation is used not only for the multi-user (MU) case but also for the single-user (SU) case, and in this case, a 242-unit can be used, such as Figure 8 In this case, three DC tones can be inserted.

[0115] exist Figure 8 In the examples, various sizes of RUs are illustrated, that is, 26-RU, 52-RU, 106-RU, 242-RU, etc., but the specific sizes of these RUs can be reduced or expanded. 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 a predetermined bandwidth (e.g., 20 MHz, 40 MHz, 80 MHz, 160 MHz, 320 MHz, ...) in the present disclosure, the number of RUs can 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.

[0116] Fig. 9 is a diagram illustrating exemplary allocation of resource units (RUs) used on a 40 MHz frequency band.

[0117] As in Figure 8 As in the example using various RU sizes, you can also Fig. 9 In the example of , 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, etc. are used. In addition, 5 DC tones can be inserted at the center frequency, 12 tones can be used as a guard band in the leftmost band of the 40 MHz band, and 11 tones can be used as a guard band in the rightmost band of the 40 MHz band.

[0118] Additionally, as shown, when used for a single user, a 484-RU may be used.

[0119] Fig.10 is a diagram illustrating exemplary allocation of resource units (RUs) used on an 80 MHz frequency band.

[0120] As in Figure 8 and Fig. 9 As in the example using various RU sizes, you can also Fig.10 In the example of 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, 996-RU, etc. are used. In addition, in the case of 80MHz PPDU, the RU allocation of HE PPDU and EHT PPDU can be different, and Fig.10 The example of FIG. 4 shows an example of RU allocation for an 80 MHz EHT PPDU. Fig.10 The scheme in which 12 tones in the example are used as a guard band in the leftmost band of the 80 MHz band and 11 tones are used as a guard band in the rightmost band of the 80 MHz band is the same as in the HE PPDU and the EHT PPDU. Unlike the HE PPDU in which 7 DC tones are inserted in the DC band and there is a 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 a 26-RU on the left and right sides of the DC band. Unlike the HE PPDU in which one empty subcarrier exists between the 242-RUs instead of the center band, there are five empty subcarriers in the EHT PPDU. 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.

[0121] Additionally, as shown, when used for a single user, 996-RU may be used, and in this case, 5 DC tones are inserted as with HEPPDU and EHT PPDU.

[0122] exist Fig.10 In the example, the EHT PPDU on 160MHz can be configured with multiple 80MHz sub-blocks. The RU allocation for each 80MHz sub-block can be the same as 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 more than one RU (MRU), the 80 MHz sub-block can be used. Fig.10 The 996-RU.

[0123] Here, the MRU corresponds to a group of subcarriers (or tones) consisting 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, 2×996+484-tones, 3×996-tones, or 3×996+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.

[0124] When an 80 MHz sub-block includes RUs 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.

[0125] 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 trigger 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.

[0126] For example, when a DL MU PPDU is configured, 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, the transmitting STA (e.g., AP) may transmit the HE-STF, HE-LTF, and data fields for the first STA through the first RU in one MU PPDU, and transmit the HE-STF, HE-LTF, and data fields for the second STA through the second RU.

[0127] Information about the allocation of RUs may be signaled in HE PPDU format through HE-SIG-B.

[0128] Fig.11 An example structure of the HE-SIG-B field is illustrated.

[0129] 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.

[0130] 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.).

[0131] 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 40MHz MU PPDU, N=2 in the case of 80MHz MU PPDU, N=4 in the case of 160MHz or 80+80MHz MU PPDU, and so on. An 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 20MHz band.

[0132] For example, if the value of the 8-bit RU Allocation subfield is 00000000, this may indicate that Figure 8 In the example, nine 26-RUs are allocated in sequence from the leftmost side to the rightmost side, if the value is 00000001, this may indicate that seven 26-RUs and one 52-RU are allocated in sequence from the leftmost side to the rightmost side, and if the value is 00000010, this may indicate that five 26-RUs, one 52-RU, and two 26-RUs are allocated in sequence from the leftmost side to the rightmost side.

[0133] As an additional example, if the value of the 8-bit RU Allocation subfield is 01000y2y1y0, this may indicate that Figure 8 In the example, 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 (i.e., y2y1y0). For example, when the 3-bit information (y2y1y0) corresponds to a decimal value N, the number of users / STAs allocated to the 106-RU can be N+1.

[0134] 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.

[0135] 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 from the common field or independently of the common field.

[0136] Fig.12 is a diagram for explaining a MU-MIMO method in which multiple users / STAs are assigned to one RU.

[0137] exist Fig.12 In the example, 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 may be allocated to the 106-RU in a MU-MIMO manner. As a result, 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 an RU, such as Fig.12 shown.

[0138] The user field may be constructed based on two formats. The user field for MU-MIMO allocation may be constructed in a first format, and the user field for non-MU-MIMO allocation may be constructed in 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).

[0139] The user field of the first format (i.e., the format allocated for MU-MIMO) may be constructed as follows. For example, among all 21 bits of a user field, B0-B10 include identification information of the user (e.g., STA-ID, AID, partial AID, etc.), B11-B14 include spatial configuration information such as the number of spatial streams of 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 about the coding type (e.g., binary convolutional coding (BCC) or low-density parity check (LDPC)) applied to the data field of the corresponding PPDU.

[0140] The user field of the second format (i.e., the format for non-MU-MIMO allocation) can be constructed as follows. For example, among all 21 bits of a user field, B0-B10 include identification information of the user (e.g., STA-ID, AID, partial AID, etc.), B11-B13 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 (e.g., BCC or LDPC) applied to the data field of the corresponding PPDU.

[0141] 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 about 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 about the channel coding type (e.g., BCC or LDPC) may be excluded from the MCS information.

[0142] Fig.13 An example of a PPDU format to which the present disclosure can be applied is illustrated.

[0143] Fig.13The PPDU of the present disclosure may be referred to as 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 as various names such as transmitted PPDU, received PPDU, first type or Nth type PPDU. In addition, the EHT PPU may be used in an EHT system and / or a new wireless LAN system in which the EHT system is improved.

[0144] Fig.13 The EHT MU PPDU corresponds to a PPDU carrying one or more data (or PSDU) for one or more users. That is, the EHT MU PPDU can be used for SU transmission and MU transmission. For example, the EHT MU PPDU can correspond to a PPDU for one receiving STA or more receiving STAs.

[0145] exist Fig.13 In the EHT TB PPDU, the EHT-SIG is omitted compared to the EHT MU PPDU. Upon receiving a trigger for ULMU transmission (eg, a trigger frame or TRS), the STA may perform UL transmission based on the EHT TB PPDU format.

[0146] 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.

[0147] 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.

[0148] 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.

[0149] Fig.13The L-SIG field may consist of 24 bits and may be used to transmit rate and length information. For example, the L-SIG field includes 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 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 non-HT, HT, VHT, or EHT PPDUs, the value of the length field may be determined as a multiple of 3. For example, for HE PPDUs, the value of the length field may be determined as a multiple of 3 + 1 or a multiple of 3 + 2.

[0150] For example, the transmitting STA may apply BCC encoding based on the coding rate of 1 / 2 to 24 bits of information of the L-SIG field. Thereafter, the transmitting STA may obtain 48 BCC coded bits. BPSK modulation may be applied to the 48 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}). As a result, 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 additionally 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}.

[0151] The transmitting STA can construct the RL-SIG with the same structure as the L-SIG. BPSK modulation is applied to the RL-SIG. Based on the existence of the RL-SIG, the receiving STA can identify whether the received PPDU is a HE PPDU or an EHT PPDU.

[0152] 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.

[0153] The U-SIG may include N bits of information and may include information for identifying the EHT PPDU type. For example, the U-SIG may be configured based on two symbols (e.g., two consecutive OFDM symbols). Each symbol of the U-SIG (e.g., OFDM symbol) 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.

[0154] For example, through U-SIG (or U-SIG field), A-bit information (e.g., 52 uncoded bits) may be transmitted, the first symbol of 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 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 the 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 assigned to each U-SIG symbol by performing BPSK modulation on the interleaved 52 coded bits. Except for DC index 0, one U-SIG symbol may be transmitted based on 56 tones (subcarriers) from subcarrier index -28 to subcarrier index +28. 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.

[0155] 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 may be sent through the second symbol of the U-SIG. The CRC field may 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 excluding the CRC / tail field, and may be constructed based on a conventional CRC calculation algorithm. In addition, the tail field may be used to terminate the trellis of the convolutional decoder, and, for example, the tail field may be set to 0.

[0156] The bit information (e.g., 52 uncoded bits) transmitted by the U-SIG (or U-SIG field) may be divided into version-dependent bits and version-independent bits. For example, the size of the version-independent bits may be fixed or variable. For example, the version-independent bits may be assigned only to the first symbol of the U-SIG, or the version-independent bits may be assigned to 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 as various names such as the first control bit and the second control bit.

[0157] 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.

[0158] 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.

[0159] For example, the version-independent bits of the U-SIG may include information about a transmit opportunity length (TXOP) and information about a BSS color ID.

[0160] 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-related bit of the U-SIG.

[0161] For example, U-SIG may include information about the following items: 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 about the number of symbols used for the EHT-SIG, 5) a field containing information about whether the EHT-SIG is constructed on all frequency bands, 6) a field containing information about the type of EHT-LTF / STF, and 7) a field indicating the EHT-LTF length and the CP length.

[0162] Can Fig.13 Preamble puncturing may be applied to a PPDU that is sent to one or more users. Preamble puncturing may mean the transmission of a PPDU in which no signal exists in one or more 20 MHz subchannels in the bandwidth of the PPDU. Preamble puncturing may be applied to a PPDU that is sent to one or more users. For example, for an EHT MU PPDU in OFDMA transmission with a bandwidth greater than 40 MHz and a non-OFDMA transmission with a bandwidth of 80 MHz and 160 MHz, the resolution of preamble puncturing may be 20 MHz. That is, in the above case, puncturing on a subchannel smaller than 242-tone RUs may not be allowed. In addition, for an EHT MU PPDU in a non-OFDMA transmission with a bandwidth of 320 MHz, the resolution of preamble puncturing may be 40 MHz. That is, puncturing of a subchannel smaller than 484-tone RUs in a 320 MHz bandwidth may not be allowed. In addition, preamble puncturing may not be applied to the primary 20 MHz channel in the EHT MU PPDU.

[0163] For example, for an EHT MU PPDU, information about preamble puncturing 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.

[0164] For example, the U-SIG and the EHT-SIG may include information about preamble puncturing based on the following method. If the bandwidth of the PPDU exceeds 80 MHz, the U-SIG may be independently constructed 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 puncturing applied to the first 80 MHz band (i.e., information about the preamble puncturing 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 puncturing applied to the second 80 MHz band (i.e., information about the preamble puncturing pattern). The EHT-SIG after the first U-SIG may include information about preamble puncturing applied to the second 80 MHz frequency band (i.e., information about the preamble puncturing pattern), and the EHT-SIG after the second U-SIG may include information about preamble puncturing applied to the first 80 MHz frequency band (i.e., information about the preamble puncturing pattern).

[0165] 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 of all bands (i.e., 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 (i.e., information about preamble puncturing patterns).

[0166] The U-SIG can be constructed in units of 20MHz. For example, if an 80MHz PPDU is constructed, the U-SIG can be duplicated. That is, the same 4 U-SIGs can be included in the 80MHz PPDU. PPDUs with bandwidths exceeding 80MHz can include different U-SIGs.

[0167] Fig.13 The EHT-SIG may include control information for the receiving STA. 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.

[0168] EHT-SIG may include Fig.11 and Fig.12 The technical features of HE-SIG-B are described. For example, Figure 8 As 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.

[0169] As in Fig.11 As in the example of , the common field of EHT-SIG and the user-specific field of EHT-SIG can be encoded separately. One user block field included in the user-specific field can contain information for two user fields, but the last user block field included in the user-specific field can contain one or two user fields. That is, one user block field of EHT-SIG can contain up to two user fields. As in Fig.12 As in the example of , each user field may be associated with a MU-MIMO allocation or a non-MU-MIMO allocation.

[0170] With Fig.11 In the same manner as in the example of , the common field of the EHT-SIG may include a CRC bit and a tail bit. The length of the CRC bit may be determined as 4 bits, and the length of the tail bit may be determined as 6 bits and may be set to 000000.

[0171] As in Fig.11As in the example of , the common field of the EHT-SIG may include RU allocation information. The RU allocation information may be information about the locations of the 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).

[0172] A mode in which the common field of the EHT-SIG is omitted may be supported. A 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 (ie, multiple receiving STAs) may decode the PPDU (eg, the data field of the PPDU) based on non-OFDMA. That is, multiple users of the EHT PPDU may decode the PPDU (eg, 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 (eg, the data field of the PPDU) based on OFDMA. That is, multiple users of the EHT PPDU may receive the PPDU (eg, the data field of the PPDU) via different frequency bands.

[0173] The EHT-SIG may be constructed based on various MCS schemes. As described above, information related to the MCS scheme applied to the EHT-SIG may be included in the U-SIG. The EHT-SIG may be constructed based on the DCM scheme. The DCM scheme may 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 may be repeatedly mapped on available tones / subcarriers. For example, a modulation symbol (e.g., a BPSK modulation symbol) applying a specific modulation scheme may 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 for the EHT-SIG, and a modulation symbol (e.g., a BPSK modulation symbol) applying the same specific modulation scheme may be 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 automatic gain control (AGC) estimation in a MIMO environment or an OFDMA environment. Fig.13 The EHT-LTF can be used to estimate channels in a MIMO environment or an OFDMA environment.

[0174] Information about the type of STF and / or LTF (including information about a guard interval (GI) applied to LTF) may be included in Fig.13The U-SIG field and / or EHT-SIG field of the RFID tag may be used.

[0175] Can be based on Figures 8 to 10 Example construction of RU allocation Fig.13 PPDU (ie, EHT PPDU).

[0176] For example, based on Figure 8 The RU constructs an EHT PPDU to be sent on the 20 MHz band, that is, a 20 MHz EHT PPDU. Figure 8 As shown in , the RU positions of the EHT-STF, EHT-LTF, and data fields included in the EHT PPDU can be determined. Fig. 9 The RU constructs an EHT PPDU to be sent on the 40 MHz band, that is, a 40 MHz EHT PPDU. Fig. 9 As shown in , RU positions of EHT-STF, EHT-LTF, and data fields included in the EHT PPDU may be determined.

[0177] Can be based on Fig.10 The RU constructs an EHT PPDU to be sent on the 80 MHz band, that is, an 80 MHz EHT PPDU. Fig.10 As shown in , RU positions of EHT-STF, EHT-LTF, and data fields included in the EHT PPDU may be determined. Fig.10 The tone plan for 80 MHz in may correspond to Fig. 9 Two repetitions of the tone plan for 40 MHz.

[0178] The tone plan for 160 / 240 / 320MHz can be repeated multiple times Fig. 9 or Fig.10 The mode is configured in the form of.

[0179] Fig.13 A PPDU can be identified as an EHT PPDU based on the following method.

[0180] 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) the RL-SIG that repeats the L-SIG of the received PPDU 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 the received PPDU is determined to be an EHT PPDU, the receiving STA may determine the type of the received PPDU as an EHT PPDU based on Fig.13 In other words, the receiving STA can determine that the received PPDU is an EHT PPDU based on 1) the first symbol (BSPK) after the L-LTF signal, 2) the RL-SIG that 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.

[0181] For example, the receiving STA may determine the type of the received PPDU as the HE PPDU based on 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 as 1 or 2, the received PPDU may be determined as the HE PPDU.

[0182] 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 repeating the L-SIG is not detected, the received PPDU may be determined as non-HT, HT, and VHT PPDU.

[0183] In addition, when the receiving STA detects the RL-SIG that repeats the L-SIG in the received PPDU, it can be determined whether the received PPDU is a HE PPDU or an EHT PPDU. In this case, if the rate (6Mbps) check fails, the received PPDU can be determined as a non-HT, HT, or VHT PPDU. If the rate (6Mbps) check and parity check pass, when the result of applying modulo 3 to the length value of the L-SIG is detected as 0, the received PPDU can be determined as an EHT PPDU, and when the result of length mod 3 is not 0, it can be determined as an HE PPDU.

[0184] 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.

[0185] Fig.14 is a diagram showing an example format of a trigger frame to which the present disclosure may be applied.

[0186] The trigger frame may allocate resources for at least one TB PPDU transmission and request TB PPDU transmission. The trigger frame may also include other information required by the STA, in response to which the STA transmits the TB PPDU. The trigger frame may include common information and user information list fields in the frame body.

[0187] The common information field may include information commonly used for at least one TB PPDU sent for a triggered frame request, such as trigger type, UL length, whether there are subsequent trigger frames (e.g., more TFs), whether channel sensing (CS) is required, UL bandwidth (BW), etc. Fig.14 The EHT variant common information field format is exemplarily shown.

[0188] The 4-bit Trigger Type subfield may have a value from 0 to 15. Among them, the values ​​0, 1, 2, 3, 4, 5, 6, and 7 of the Trigger Type subfield are defined to correspond to Basic, Beamforming Report Poll (BFRP), Multi-User Block Acknowledgement Request (MU-BAR), Multi-User Request to Send (MU-RTS), Buffer Status Report Poll (BSRP), Multicast with Retry (GCR) MU-BAR, Bandwidth Query Report Poll (BQRP), and NDP Feedback Report Poll (NFRP), and values ​​8-15 are defined to be reserved.

[0189] In the common information, the trigger-related common information subfield may include information selectively included based on the trigger type.

[0190] A special user information field may be included in the trigger frame. The special user information field does not include user-specific information, but includes extended common information that is not provided in the common information field.

[0191] The user information list includes at least 0 user information fields. Fig.14 The EHT variant user information field format is exemplarily shown.

[0192] It indicates that the AID12 subfield is basically a user information field of the STA with the corresponding AID. In addition, when the AID12 field has a predetermined specific value, it can be used for other purposes, including allocating a random access (RA)-RU or configuring in the form of a special user information field. The special user information field is a user information field that does not include user-specific information but includes extended public information that is not provided in the public information field. For example, the special user information field can be identified by the AID12 value 2007, and the special user information field flag subfield in the public information field can indicate whether the special user information field is included.

[0193] The RU allocation subfield may indicate the size and location of the RU / MRU. For this purpose, the RU allocation subfield may be interpreted with the PS160 (primary / secondary 160 MHz) subfield of the user information field, the UL BW subfield of the common information field, and the like.

[0194] In addition, in the present disclosure, a tone plan may be associated with a rule for determining the size and / or location of a resource unit (RU). In the following, a tone plan applied to a HE PPDU (i.e., a PPDU according to the IEEE 802.11ax standard) is described as an example. Specifically, the RU size / location applied to the HE PPDU and control information related to the RU applied to the HE PPDU are described.

[0195] In the present disclosure, the control information related to the RU (or the control information related to the tone plan) may include control information about the size and position of the RU, information about the user STA assigned to a specific RU, the frequency bandwidth of the PPDU including the RU, and / or the modulation scheme applied to the specific RU. The control information related to the RU may be included in the SIG field. For example, the control information related to the RU may be included in the HE-SIG-B field. That is, in the process of generating a transmitted PPDU, the transmitting STA may include control information about the RU included in the PPDU in the HE-SIG-B field. In addition, the receiving STA may receive the HE-SIG-B included in the received PPDU, obtain the control information included in the HE-SIG-B, determine whether there is an RU assigned to the corresponding receiving STA, and decode the allocated RU based on the HE-SIG-B.

[0196] In an existing wireless LAN system (e.g., IEEE 802.11ax standard), HE-STF, HE-LTF, and data fields may be configured in units of RUs. That is, when a first RU for a first receiving STA is configured, the STF / LTF / data fields for the first receiving STA may be sent and received through the first RU.

[0197] In an existing wireless LAN system (eg, IEEE 802.11ax standard), a PPDU for one receiving STA (ie, SU PPDU) and a PPDU for multiple receiving STAs (ie, MU PPDU) may be separately defined, and a tone plan for each receiving STA may be separately defined.

[0198] Specifically, the RU may include multiple subcarriers. For example, if the RU includes N subcarriers, it may be represented as an N-tone RU or N RU. The location of a specific RU may be indicated by a subcarrier index. Here, the subcarrier index may be defined in units of subcarrier frequency intervals. For example, in a wireless LAN system, the subcarrier frequency interval may be 312.5kHz or 78.125kHz, and the subcarrier frequency interval for the RU may be 78.125kHz. That is, the subcarrier index "+1" for the RU may represent a position where 78.125kHz is added to the DC tone, and the subcarrier index "-1" for the RU may represent a position where 78.125kHz is reduced from the DC tone. For example, if the location of a specific RU is represented as [-121:-96], the RU is located in the region from subcarrier index -121 to subcarrier index -96, and as a result, the RU may include 26 subcarriers. In addition, the N-tone RU may include a preconfigured pilot tone.

[0199] Method for indicating allocated RU / MRU within extended BW

[0200] In the next generation wireless LAN system, an extended BW may be used to transmit and receive signals. For example, the extended BW may correspond to a 480 MHz bandwidth, a 560 MHz bandwidth, and / or a 640 MHz bandwidth.

[0201] In contrast, in existing wireless LAN systems (e.g., IEEE 802.11be), only triggered-based (TB) PPDU transmission using a maximum bandwidth of 320 MHz is considered. Therefore, when an extended BW is used in a next-generation wireless LAN system, a method for indicating resource unit allocation (RU allocation) for TB PPDU transmission for the extended BW may be required.

[0202] Hereinafter, the present disclosure proposes a method of indicating an allocated RU / multiple RUs (MRUs) within an extended BW to trigger / soliciting a TB PPDU to a non-AP STA using the extended BW.

[0203] In this regard, the extended BW may be configured with the following channel combinations for RU / MRU allocation.

[0204] For example, if the extended BW corresponds to a 480MHz bandwidth, the 480MHz bandwidth may be configured with a 320MHz channel and a 160MHz channel. Here, the 320MHz channel may be configured as a primary channel. Here, the primary channel may mean a 320MHz channel in a relatively high frequency range within the 480MHz bandwidth. Alternatively, considering the case where the bandwidth is configured with a channel of a 160MHz unit, the 480MHz bandwidth may be configured with three 160MHz channels. In this case, the 160MHz channel may be configured as a primary (or first) 160MHz channel, a secondary 160MHz channel, and a third 160MHz channel (or a 160MHz channel in a relatively low frequency range within the secondary 320MHz), respectively.

[0205] For another example, if the extended BW corresponds to a 560MHz bandwidth, the 560MHz bandwidth may be configured with a 320MHz channel and a 240MHz channel. Here, the 320MHz channel may be configured as a primary channel. Alternatively, considering the case where the bandwidth is configured with a 160MHz unit, the 560MHz bandwidth may be configured with three 160MHz channels and one 80MHz channel. In this case, the 160MHz channel may be represented as a primary (or first) 160MHz channel, an auxiliary 160MHz channel, and a third 160MHz channel (or a 160MHz channel in a relatively low frequency range within the auxiliary 320MHz), and the 80MHz channel may be represented as a fourth channel, an 80MHz channel in a relatively low frequency range.

[0206] For another example, when the extended BW corresponds to a 640MHz bandwidth, the 640MHz bandwidth may be composed of a 320MHz channel and a 320MHz channel. Here, two 320MHz channels may be configured as a main channel and a secondary channel, respectively. Here, the secondary channel may represent a 320MHz channel in a relatively low frequency range within the 640MHz bandwidth. Alternatively, considering the situation where the bandwidth is composed of channels of 160MHz units, the 640MHz bandwidth may be composed of four 160MHz channels. In this case, the 160MHz channels may be represented as a main (or first) 160MHz channel, a secondary 160MHz channel, a third 160MHz channel, and a fourth 160MHz channel, respectively.

[0207] Considering the channel configuration of the extended BW as described above, RU / MRU allocation for triggering / requesting TB PPDU transmission on the extended BW may be configured / indicated based on at least one of the following embodiments.

[0208] The embodiments described in the present disclosure below are distinguished only for clarity of explanation, and the configurations described in some embodiments may be applied merged / replaced / combined with the configurations of other embodiments, or may be applied independently.

[0209] Implementation Method 1

[0210] The present embodiment relates to a method for indicating RU / MRU allocation for a TB PPDU based on a 160 MHz channel.

[0211] Specifically, in order to indicate an added / extended 160 MHz channel in the extended BW, 1 bit of additional signaling may be allocated and used to indicate the extended channel.

[0212] For the above 1-bit additional signaling, the trigger frame in the existing wireless LAN system (for example, Fig.14 A reserved bit in a user field (e.g., a user information field) of a trigger frame in the trigger frame may be used for the above indication. Here, the bit used for the indication may be B25 of the user field in the trigger frame.

[0213] For example, B25 may be defined as a 160 extension field, and B25 may be used to indicate the location of a 160 MHz channel. Here, the field name is an example and may be redefined with another field name.

[0214] Fig.15 An example of a user field of a trigger frame considering extended BW support according to an embodiment of the present disclosure is illustrated.

[0215] Reference Fig.15 As described above, B25 of the user field in the trigger frame can be defined as an extended field 160. That is, the trigger frame exemplifies a trigger frame in a next generation wireless LAN system supporting an extended BW.

[0216] In the case of a TB PPDU in a triggered / requested extended BW, the RU / MRU allocation (field) sent through the trigger frame can indicate the 160MHz channel to which the RU / MRU is allocated by using B25 (i.e., 160 extension field) and B39 (i.e., PS160 field) included in the user field.

[0217] In this regard, the information of B25 and B39 can be used to indicate in which 160MHz channel the RU / MRU for the TB PPDU is located / included. At this time, by using the B0 bit of the allocation field (i.e., the RU allocation field), information about which 80MHz channel position within the 160MHz indicated by the above two bits (i.e., B25 and B39) the allocated RU / MRU exists can be indicated.

[0218] For example, B25 and B39 may be defined / set as shown in Table 1 below, and the location of the 160 MHz channel may be indicated by B25 and B39.

[0219] [Table 1]

[0220]

[0221] For another example, the values ​​in Table 1 above may also be configured in a combination of (B25 B39).

[0222] If the bandwidth is less than 160 MHz, 2 bits (B39 B25) can always be set to (0,0).

[0223] If the bandwidth is 320 MHz, B25 may be set to a value of 0. At this time, B39 may be set to a value of 0 if the RU / MRU is located in a primary 160 MHz channel, and may be set to a value of 1 if the RU / MRU is located in a secondary 160 MHz channel.

[0224] If the bandwidth is an extended BW greater than 320 MHz, the allocation information for RU / MRU allocated within the extended BW may be confirmed / identified using the BW information set according to the 160 MHz channel where the RU / MRU is located and the (B39 B25) information as shown in Table 1.

[0225] Implementation Method 2

[0226] The present embodiment relates to a method of performing RU / MRU allocation for an extended BW using 2-bit information.

[0227] At this time, the trigger frame of the existing wireless LAN system (for example, Fig.14 The user field of the trigger frame in the example may be restated with respect to the corresponding 2-bit information field.

[0228] For example, 2 bits of information may be defined as a 160 MHz indication field. A combination of 2 bits may indicate a 160 MHz channel containing a RU / MRU allocated for transmitting a TB PPDU in a BW including an extended BW.

[0229] Table 2 shows the indication of the 160 MHz channel according to the above 2-bit 160 MHz indication field.

[0230] [Table 2]

[0231]

[0232] If BW is less than 160MHz, the value of the field can be set to 0.

[0233] B0 of the RU allocation field may be used to indicate the position of the 80 MHz channel to which the RU / MRU is allocated within the 160 MHz channel.

[0234] In this regard, the 160 MHz indication field may be located before the RU allocation field in the user field of the restated trigger frame. The location of this field is an example, and considering the size of other information fields, this field may be located within the user field.

[0235] Implementation 3

[0236] The present embodiment relates to a method of indicating a channel including a RU / MRU for a TB PPDU by adding an indication based on a 320 MHz channel.

[0237] As in the above channel configuration, the extended BW may be configured based on a 320 MHz channel. Therefore, RU allocation for TB PPDU may be performed as follows.

[0238] Specifically, the PS320 field may be defined to indicate 320 MHz in the extended BW, and the PS320 field may be composed of 1 bit of information. The 1 bit of information may be B25 of the user field in the trigger frame. Here, the field name is an example and may be redefined with another field name.

[0239] Fig.16 Another example of a user field of a trigger frame considering extended BW support according to an embodiment of the present disclosure is illustrated.

[0240] Reference Fig.16 , B25 of the user field in the trigger frame can be defined as the PS320 field as described above. That is, the trigger frame exemplifies the trigger frame in the next generation wireless LAN system supporting the extended BW.

[0241] The PS320 field may be used to indicate the location of the 320 MHz channel. Specifically, a value of 0 in the field may be set / defined to indicate a primary 320 MHz channel, and a value of 1 may be set / defined to indicate a secondary 320 MHz channel.

[0242] In this regard, for a BW of 320 MHz or less, the PS320 field may always be set to a value of 0. To indicate a 160 MHz channel or an 80 MHz channel with RU / MRU, the PS160 field and B0 of the RU allocation field may be used.

[0243] In addition, for an extended BW greater than 320 MHz, the PS320 field may be used to indicate the 320 MHz channel where the RU / MRU allocated for the TB PPDU is located. For each BW, the value of the PS320 field may be set as follows.

[0244] When the extended BW corresponds to a 480MHz bandwidth, the extended BW may be configured as a combination of a 320MHz channel and a 160MHz channel. In this case, when the RU / MRU is present in the primary 320MHz channel, the PS320 field may be set to a value of 0, and when the RU / MRU is present in a 160MHz channel (e.g., a relatively lower 160MHz channel within a secondary 320MHz channel), the PS320 field may be set to a value of 1.

[0245] Alternatively, the 480MHz bandwidth can be configured as a combination of a primary 160MHz channel and a secondary 320MHz channel. In this case, if the RU / MRU is present in the primary 160MHz channel (e.g., a 160MHz channel within the primary 320MHz channel), the PS320 field can be set to a value of 0, and if the RU / MRU is present in the secondary 320MHz channel, the PS320 field can be set to a value of 1.

[0246] The RU allocation field and the B0 bit of the PS160 field may be used to indicate information on which 160 MHz channel or 80 MHz channel the allocated RU / MRU is located within 320 MHz indicated by the above-mentioned PS320 field.

[0247] Additionally or alternatively, when the extended BW corresponds to a 560 MHz bandwidth, the extended BW may be configured with a combination of a 320 MHz channel and a 240 MHz channel, or a combination of a 320 MHz channel, a 160 MHz channel, and an 80 MHz channel.

[0248] At this time, the combination of 240MHz channel / 160MHz channel and 80MHz channel can be considered as a channel configuration included in one of the two 320MHz channels. Therefore, the combination of 240MHz channel / 160MHz channel and 80MHz channel can be indicated via the PS320 field. Here, since the 560MHz bandwidth is indicated via the BW information / field, the PS320 field / bit can be used to set / indicate one of the two 320MHz according to the position of the allocated RU / MRU.

[0249] For example, if the RU / MRU allocated for the TB PPDU corresponds to a 320 MHz channel, the PS320 field may be set to a value of 0. Conversely, if the RU / MRU is included in a combination of a 240 MHz channel / 160 MHz channel and an 80 MHz channel, the PS320 field may be set to a value of 1. This is merely an example, and the corresponding bit setting may be set in the opposite direction for the above indication. This may be accomplished by using a trigger frame of an existing wireless LAN system (e.g., Fig.14 ) is used to indicate the location of the RU / MRU allocated to a 160MHz channel or an 80MHz channel that is smaller than a 320MHz channel.

[0250] Since the 560 MHz bandwidth is indicated by the BW information / field, the PS320 field / bit may be used to set / indicate one of the two 320 MHz according to the location of the allocated MRU.

[0251] Additionally or alternatively, if the extended BW corresponds to a 640 MHz bandwidth, the extended BW may be configured with two 320 MHz channels. Therefore, the PS320 field may be set / defined to indicate information about which 320 MHz channel the allocated RU / MRU is located on.

[0252] For example, if the allocated RU / MRU is located in the primary 320MHz channel, the corresponding field / bit may be set to a value of 0 to indicate the corresponding information. On the other hand, if the allocated RU / MRU is located in the secondary 320MHz channel, the corresponding field / bit may be set to a value of 1 to indicate the corresponding information.

[0253] For a 160 MHz channel or an 80 MHz channel that is smaller than a 320 MHz channel, a trigger frame of an existing wireless LAN system (eg, Fig.14 )’s user field and the B0 bit of the RU allocation field to perform location indication of the allocated RU / MRU.

[0254] Implementation 4

[0255] In the case of the above-mentioned Embodiments 1 to 3, the present disclosure relates to a method of triggering / requesting a TB PPDU using an extended BW using a trigger frame.

[0256] In contrast, in the present embodiment, a case where a TB PPDU is triggered / requested using a triggered response scheduling (TRS) control field included in a frame is considered.

[0257] In order to indicate information about a 320 MHz / 160 MHz channel for RU / MRU allocated in an extended BW when a TRS Control field is used to trigger / request a TB PPDU, the TRS Control field may be configured to include the following information.

[0258] Similar to the aforementioned embodiment 1, the TRS control field may include a 160 extension bit (1 bit) for indicating a 160 MHz channel unit. At this time, by utilizing / using the 160 extension bit and PS160 related information, information about which 160 MHz channel the allocated RU / MRU is located on within the extended BW may be indicated.

[0259] Similar to the above-mentioned Embodiment 2, the TRS control field may include a 160 indication field consisting of 2 bits. Using a 2-bit value, a 160 MHz channel including the allocated RU / MRU as described above may be indicated.

[0260] Similar to the above embodiment 3, the TRS control field may include a 320MHz indication. Here, the PS320 field may indicate information about which 320MHz channel the allocated RU / MRU is located on. In addition, the PS160 field may be used to indicate the 160MHz channel of the allocated RU / MRU within 320MHz.

[0261] Fig.17 is a flowchart for illustrating the operation of a STA based on a trigger frame according to the present disclosure.

[0262] In step S1710, the STA may receive a trigger frame including a user information field (user info field) from the AP.

[0263] Here, as in the above-mentioned embodiment of the present disclosure, the user information field may include first information and second information related to the channel indication. The first information and the second information may each consist of 1-bit information.

[0264] In this case, based on the bandwidth for the STA exceeding 320 MHz, a combination of the first information and the second information may indicate a location of a channel to which resources for the TB PPDU are allocated within the bandwidth exceeding 320 MHz.

[0265] In this regard, the location of the channel may be indicated in units of 160 MHz channels. Additionally, the location of the 80 MHz channel within the 160 MHz channel associated with allocation of resources for the TB PPDU may be based on a value of the resource unit allocation subfield included in the user information field.

[0266] For example, if the bandwidth exceeding 320 MHz is a 480 MHz bandwidth, the combination may indicate one of: a first 160 MHz channel within the primary 320 MHz channel, a second 160 MHz channel within the primary 320 MHz channel, or a first 160 MHz channel within the secondary 320 MHz channel.

[0267] For example, if the bandwidth exceeding 320 MHz is a 560 MHz bandwidth or a 640 MHz bandwidth, the combination may indicate one of: a first 160 MHz channel within a primary 320 MHz channel, a second 160 MHz channel within a primary 320 MHz channel, a first 160 MHz channel within a secondary 320 MHz channel, or a second 160 MHz channel within a secondary 320 MHz channel.

[0268] For example, the first information may correspond to information indicating whether it is a primary 320 MHz channel or a secondary 320 MHz channel (e.g., bit B39 of the user information field). The second information may correspond to information indicating the location of the 160 MHz channel within the primary channel or the secondary channel (e.g., bit B25 of the user information field).

[0269] In this regard, as in the above-mentioned embodiment of the present disclosure, the first value of the combination may indicate the first 160MHz channel within the primary 320MHz channel, the second value of the combination may indicate the second 160MHz channel within the primary 320MHz channel, the third value of the combination may indicate the first 160MHz channel within the secondary 320MHz channel, and the fourth value of the combination may indicate the second 160MHz channel within the secondary 320MHz channel.

[0270] Additionally or alternatively, both the first information and the second information may be set to a value of 0 based on a bandwidth for the STA being less than or equal to 160 MHz.

[0271] Additionally or alternatively, based on the bandwidth for the STA being the 320 MHz bandwidth, the first information may indicate whether the location of the channel is a primary 160 MHz channel or a secondary 160 MHz channel, and the second information may be set to a value of 0.

[0272] Additionally or alternatively, resources for the TB PPDU may be allocated in resource units (RU) or multiple RU (MRU) units.

[0273] In step S1720, the STA may send a TB PPDU triggered by a trigger frame to the AP.

[0274] exist Fig.17 The method performed by STA described in the example of Figure 1 The first device (100) performs. For example, Figure 1 The one or more processors (102) of the first device (100) may be configured to receive a trigger frame including a user information field from the AP (200) through one or more transceivers (106), and send a TBPPDU triggered by the trigger frame to the AP (200). In addition, the one or more memories (104) of the first device (100) may store a method for executing the method when executed by the one or more processors (102). Fig.17 The commands for the methods described in the examples.

[0275] Fig.18 is a flowchart for illustrating the operation of an AP based on a trigger frame according to the present disclosure.

[0276] In step S1810, the AP may send a trigger frame including a user information field (user info field) to the STA.

[0277] Here, as in the above-mentioned embodiment of the present disclosure, the user information field may include first information and second information related to the channel indication. The first information and the second information may each be composed of 1-bit information.

[0278] In this case, based on the fact that the bandwidth for the STA exceeds 320 MHz, the combination of the first information and the second information may indicate the location of a channel to which resources for the TB PPDU are allocated within the bandwidth exceeding 320 MHz.

[0279] In step S1820 , the AP may receive a TB PPDU triggered by a trigger frame from the STA.

[0280] The specific details of the channel position indication method and the information included in the user information field are the same as those mentioned above. Fig.17 The descriptions are the same, so redundant descriptions are omitted.

[0281] exist Fig.18 The method performed by the AP described in the example may be performed by Figure 1 The second device (200) is executed. For example, Figure 1 The one or more processors (202) of the second device (200) may be configured to send a trigger frame including a user information field to the STA (100) through one or more transceivers (206), and receive a TB PPDU triggered by the trigger frame from the STA (100). In addition, the one or more memories (204) of the second device (200) may store a method for executing the method when executed by the one or more processors (202). Fig.18 The commands for the methods described in the examples.

[0282] As described above, compared with the trigger frame for triggering TB PPDU (e.g., HE TB PPDU, EHT TB PPDU) in the existing wireless LAN system, the trigger frame proposed in the present disclosure has the following new features: it also includes information for indicating the location of the channel to which RU / MRU resources are allocated taking into account the extended BW.

[0283] By supporting triggering / request for a new version of TB PPDU, ie, a next generation wireless LAN system considering an extended BW through a trigger frame proposed in the present disclosure, throughput and efficiency aspects in a wireless LAN system may be enhanced.

[0284] The above-mentioned embodiments are to combine the elements and features of the present disclosure in a predetermined form. Unless otherwise explicitly mentioned, each element or feature should be considered as 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. Obviously, the embodiments may include claims that do not have a clear reference relationship in the combined claims, or may be included as new claims by modification after application.

[0285] It is clear to those skilled in the relevant 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 disclosure 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 disclosure.

[0286] 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 enable software or commands, etc. to be stored and executable 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 the embodiments of this disclosure. Such software or firmware may include, but is not limited to, application code, device drivers, operating systems, and execution environments / containers.

[0287] Industrial Applicability

[0288] The method proposed in the present disclosure is mainly described based on an example applied to a system based on IEEE 802.11 (5G system), but can be applied to various WLAN or wireless communication systems other than the system based on IEEE 802.11.

Claims

1. A method performed by a station STA in a wireless LAN system, the method comprising the following steps: receiving a trigger frame including a user information field from an access point AP; as well as sending a trigger-based physical layer protocol data unit TB PPDU triggered by the trigger frame to the AP, The user information field includes first information and second information related to the channel indication. wherein each of the first information and the second information consists of 1 bit of information, and Wherein, based on the fact that the bandwidth used for the STA exceeds 320 MHz, the combination of the first information and the second information indicates a position of a channel to which resources for the TB PPDU are allocated within the bandwidth exceeding 320 MHz.

2. The method according to claim 1, in, The location of the channel is indicated in units of 160 MHz channels.

3. The method according to claim 2, in, The location of the 80 MHz channel within the 160 MHz channel associated with the allocation of resources for the TB PPDU is based on a value of the resource unit allocation subfield included in the user information field.

4. The method according to claim 1, in, Based on the bandwidth exceeding 320 MHz being a 480 MHz bandwidth, the combination indicates one of a first 160 MHz channel within a primary 320 MHz channel, a second 160 MHz channel within the primary 320 MHz channel, or a first 160 MHz channel within a secondary 320 MHz channel.

5. The method according to claim 1, in, Based on the bandwidth exceeding 320 MHz being a 560 MHz bandwidth or a 640 MHz bandwidth, the combination indicates one of a first 160 MHz channel within a primary 320 MHz channel, a second 160 MHz channel within the primary 320 MHz channel, a first 160 MHz channel within a secondary 320 MHz channel, or a second 160 MHz channel within a secondary 320 MHz channel.

6. The method according to claim 1, in, The first information corresponds to information indicating whether it is a primary 320 MHz channel or a secondary 320 MHz channel, and The second information corresponds to information indicating a location of a 160 MHz channel within a primary channel or a secondary channel.

7. The method according to claim 6, in, The combined first value indicates a first 160 MHz channel within the primary 320 MHz channel, wherein the second value of the combination indicates a second 160 MHz channel within the primary 320 MHz channel, wherein the third value of the combination indicates a first 160 MHz channel within the secondary 320 MHz channel, and The fourth value of the combination indicates a second 160 MHz channel within the secondary 320 MHz channel.

8. The method according to claim 1, in, Based on the bandwidth for the STA being less than or equal to 160 MHz, both the first information and the second information are set to a value of 0.

9. The method according to claim 1, in, Based on the bandwidth for the STA being a 320 MHz bandwidth, the first information indicates that the location of the channel is a primary 160 MHz channel or a secondary 160 MHz channel, and the second information is set to a value of 0.

10. The method according to claim 1, in, The resources used for the TB PPDU are allocated in units of resource units RU or multiple resource units MRU.

11. A station STA device operating in a wireless local area network (WLAN) system, the device comprising: at least one transceiver; as well as at least one processor coupled to the at least one transceiver, Wherein, the at least one processor is configured to: receiving a trigger frame including a user information field from an access point AP; and sending a trigger-based physical layer protocol data unit TB PPDU triggered by the trigger frame to the AP, The user information field includes first information and second information related to the channel indication. wherein each of the first information and the second information consists of 1 bit of information, and Wherein, based on the fact that the bandwidth used for the STA exceeds 320 MHz, the combination of the first information and the second information indicates a position of a channel to which resources for the TB PPDU are allocated within the bandwidth exceeding 320 MHz.

12. A processing unit configured to control a station STA in a wireless local area network (WLAN) system, the processing unit comprising: at least one processor; as well as At least one computer memory operatively connected to the at least one processor and storing instructions for performing the method according to any one of claims 1 to 10 upon execution by the at least one processor.

13. At least one non-transitory computer-readable medium storing at least one instruction, wherein: The at least one instruction is executed by at least one processor to control a station STA device to perform the method according to any one of claims 1 to 10 in a wireless local area network WLAN system.

14. A method performed by an access point (AP) in a wireless LAN system, the method comprising the following steps: Sending a trigger frame including a user information field to the station STA; as well as receiving a trigger-based physical layer protocol data unit (TB PPDU) triggered by the trigger frame from the STA, The user information field includes first information and second information related to the channel indication. wherein each of the first information and the second information consists of 1 bit of information, and Wherein, based on the fact that the bandwidth used for the STA exceeds 320 MHz, the combination of the first information and the second information indicates a position of a channel to which resources for the TB PPDU are allocated within the bandwidth exceeding 320 MHz.

15. An access point (AP) device operating in a wireless local area network (WLAN) system, the device comprising: at least one transceiver; as well as at least one processor coupled to the at least one transceiver, Wherein, the at least one processor is configured to: Sending a trigger frame including a user information field to the station STA; and receiving a trigger-based physical layer protocol data unit (TB PPDU) triggered by the trigger frame from the STA, The user information field includes first information and second information related to the channel indication. wherein each of the first information and the second information consists of 1 bit of information, and Wherein, based on the fact that the bandwidth used for the STA exceeds 320 MHz, the combination of the first information and the second information indicates a position of a channel to which resources for the TB PPDU are allocated within the bandwidth exceeding 320 MHz.

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