Method and apparatus for performing trigger-based sounding for SU transmission by applying UEQM in wireless LAN system

Abstract

Proposed are a method and an apparatus for performing trigger-based sounding for SU transmission by applying UEQM in a wireless LAN system. Specifically, a receiving STA receives PHY capability information from a transmitting STA. The receiving STA receives an NDPA frame from the transmitting STA on the basis of the PHY capability information. The PHY capability information includes first and second fields. The first field includes information related to whether UEQM is supported. The second field includes information related to whether trigger-based sounding is performed for a single STA.

Description

Method and device for performing trigger-based sounding for SU transmission by applying UEQM in a wireless LAN system

[0001] The present specification relates to a technique for performing trigger-based sounding for SU transmission by applying UEQM in a wireless LAN system, and more specifically, to a method and device for defining an NPDA frame by including a field capable of performing a trigger-based sounding procedure for one non-AP STA to which UEQM is applied in PHY capability information.

[0002] Wireless local area networks (WLANs) have been improved in various ways. For example, the Extreme High Throughput (EHT) standard can utilize newly proposed increased bandwidth, an improved PHY layer protocol data unit (PPDU) structure, improved sequences, and Hybrid Automatic Repeat Request (HARQ) techniques. The EHT standard can also be referred to as the IEEE 802.11be standard.

[0003] The EHT specification supports high throughput and high data rates, which may include wide bandwidth (e.g., 160 / 320 MHz), 16 streams, and / or multi-link (or multi-band) operation.

[0004] In the EHT specification, wide bandwidth (e.g., 160 / 240 / 320 MHz) can be used to achieve high throughput. Preamble puncturing and multiple RU transmissions can also be used to efficiently utilize bandwidth.

[0005] WLAN systems can be further improved through the Ultra High Reliability (UHR) standard. The UHR system, also known as the IEEE 802.11bn standard, aims to support ultra-high reliability when transmitting signals to STAs. To achieve this, various technologies are being considered for UHR systems, including high throughput, low latency, and extended range support.

[0006] WLAN systems perform media access based on primary channels. For example, information about a primary channel with a bandwidth of 20 MHz is transmitted to multiple STAs via management frames, and any STA attempting to exchange frames can access the primary channel.

[0007] This specification proposes a method and device for performing trigger-based sounding for SU transmission by applying UEQM in a wireless LAN system.

[0008] An example of this specification proposes a method for performing trigger-based sounding for SU transmission using UEQM.

[0009] The present embodiment can be performed in a network environment that supports a next-generation wireless LAN system (UHR (Ultra High Reliability) wireless LAN system or next wi-fi). The next-generation wireless LAN system is a wireless LAN system that improves the 802.11be system and can satisfy backward compatibility with the 802.11be system.

[0010] The present embodiment is performed in a receiving STA, and the receiving STA may correspond to at least one STA (station) or non-AP MLD (non-access point Multi-link Device). The transmitting STA of the present embodiment may correspond to an AP (access point) or AP MLD.

[0011] This embodiment proposes a method for defining a trigger-based sounding procedure for measuring appropriate channel conditions during single-user (SU) transmission using Unequal modulation (UEQM). Specifically, this embodiment proposes a method for defining an NPDA frame by including a field in PHY capability information that can perform a trigger-based sounding procedure for a non-AP STA to which UEQM is applied.

[0012] A receiving STA (station) receives PHY (physical) capabilities information from a transmitting STA.

[0013] The receiving STA receives an NDPA (Null Data Packet Announcement) frame from the transmitting STA based on the PHY capability information.

[0014] The above PHY capability information (UHR PHY capabilities information field) includes first and second fields.

[0015] The first field includes information regarding whether UEQM (Unequal modulation) is supported. For example, based on the first field being set to 1, the first field may indicate that UEQM is applied. Based on the first field being set to 0, the first field may indicate that UEQM is not applied.

[0016] The second field includes information regarding whether trigger-based sounding is performed for one STA. For example, based on the second field being set to 1, the second field may indicate that trigger-based sounding is performed for the one STA (or one non-AP STA). Based on the second field being set to 0, the second field may indicate that trigger-based sounding is not performed for the one STA.

[0017] The above NPDA frame includes a RA (Receiver Address) field and a STA information field.

[0018] Based on the second field being set to 1, the RA field is set to an AID (Association Identifier) ​​for the addressed STA, and the STA information field consists of only one STA information field.

[0019] That is, the present embodiment defines capability information for indicating whether a trigger-based sounding procedure is performed for one STA, and proposes a method for configuring an NPDA frame to perform a trigger-based sounding procedure based on the capability information.

[0020] Accordingly, based on the first field being set to 1, the second field may be used. Conversely, based on the first field being set to 0, the second field may not be used.

[0021] That is, the present embodiment proposes a method for exchanging PHY capability information between an AP and a non-AP STA, configuring an NDPA frame based on the PHY capability information, and performing a trigger-based sounding procedure for measuring a channel state per spatial stream when transmitting SU to one STA.

[0022] According to the method proposed in this embodiment, the trigger-based sounding procedure enables efficient UEQM transmission suitable for channel conditions during SU transmission, thereby improving the overall throughput and reception performance.

[0023] Figure 1 illustrates an example of a transmitting device and / or a receiving device of the present specification.

[0024] Figure 2 is a conceptual diagram showing the structure of a wireless local area network (WLAN).

[0025] Figure 3 is a diagram illustrating a general link setup process.

[0026] Figure 4 illustrates one embodiment of a multi-link (ML).

[0027] FIG. 5 illustrates a PPDU (physical protocol data unit or physical layer (PHY) protocol data unit) transmitted / received by an STA of this specification.

[0028] Figure 6 is a diagram showing the layout of resource units (RUs) used for 20MHz PPDU.

[0029] Figure 7 is a diagram showing the layout of resource units (RUs) used for 40MHz PPDU.

[0030] Figure 8 is a diagram showing the layout of resource units (RUs) used for 80MHz PPDU.

[0031] Figure 9 shows the operation according to UL-MU.

[0032] Figure 10 shows an example of channels used / supported / defined within the 2.4 GHz band.

[0033] Figure 11 illustrates an example of channels used / supported / defined within the 5 GHz band.

[0034] Figure 12 illustrates an example of channels used / supported / defined within the 6 GHz band.

[0035] Figure 13 shows an example of a header of a MAC frame.

[0036] FIG. 14 illustrates a modified example of a transmitting device and / or a receiving device of the present specification.

[0037] Figures 15 and 16 are drawings illustrating an imbalance that occurs for at least one SS.

[0038] Figure 17 illustrates an example of a PHY capabilities information field format including a UEQM support field.

[0039] Figure 18 illustrates an example of a PHY capabilities information field format including a Trigger based sounding for single STA field.

[0040] Figure 19 illustrates an example of a UHR TB sounding procedure for a single STA.

[0041] Figure 20 illustrates an example of a UHR NDPA frame format.

[0042] Fig. 21 is a flowchart illustrating the operation of a transmitting device according to the present embodiment.

[0043] Fig. 22 is a flowchart illustrating the operation of a receiving device according to the present embodiment.

[0044] FIG. 23 is a flowchart illustrating a trigger-based sounding procedure for a transmitting STA to transmit SU by applying UEQM according to the present embodiment.

[0045] FIG. 24 is a flowchart illustrating a trigger-based sounding procedure for a receiving STA to transmit SU by applying UEQM according to the present embodiment.

[0046] In this specification, “A or B” can mean “only A,” “only B,” or “both A and B.” In other words, “A or B” in this specification can be interpreted as “A and / or B.” For example, “A, B or C” in this specification can mean “only A,” “only B,” “only C,” or “any combination of A, B, and C.”

[0047] As used herein, a slash ( / ) or a comma can mean "and / or." For example, "A / B" can mean "and / or B." Accordingly, "A / B" can mean "only A," "only B," or "both A and B." For example, "A, B, C" can mean "A, B, or C."

[0048] In this specification, “at least one of A and B” can mean “only A,” “only B,” or “both A and B.” Additionally, in this specification, the expressions “at least one of A or B” or “at least one of A and / or B” can be interpreted identically to “at least one of A and B.”

[0049] In addition, parentheses used in this specification may mean “for example.” Specifically, when “control information (UHR-Signal field)” is indicated, the “UHR-Signal field” may be suggested as an example of “control information.” In other words, the “control information” in this specification is not limited to the “UHR-Signal field,” and the “UHR-Signal field” may be suggested as an example of “control information.” In addition, even when indicated as “control information (UHR-Signal field),” the “UHR-Signal field” may be suggested as an example of “control information.”

[0050] Additionally, as used herein, “a / an” can mean “at least one” or “one or more.” Additionally, terms ending in “(s)” can mean “at least one” or “one or more.”

[0051] Additionally, the expressions “based on” or “on the basis of” or “according to” used herein mean “based at least in part on” and not “based solely on.”

[0052] Technical features individually described in a single drawing in this specification may be implemented individually or simultaneously.

[0053] The following examples of this specification can be applied to various wireless communication systems. For example, the following examples of this specification can be applied to wireless local area network (WLAN) systems. For example, the following examples of this specification can be applied to the IEEE 802.11a / g / n / ac / ax / be / bn standards. In addition, the examples of this specification can be applied to the Ultra High Reliability (UHR) standard or the next-generation wireless LAN standard that enhances IEEE 802.11bn. In addition, the examples of this specification can be applied to mobile communication systems. For example, the following examples of this specification can be applied to mobile communication systems based on the Long Term Evolution (LTE) and its evolution based on the 3rd Generation Partnership Project (3GPP) standard.

[0054] In order to explain the technical features of this specification, the technical features to which this specification can be applied are described below.

[0055] Figure 1 illustrates an example of a transmitting device and / or a receiving device of the present specification.

[0056] An example of FIG. 1 can perform various technical features described below. FIG. 1 relates to at least one STA (station). For example, the STA (110, 120) of the present specification may also be referred to by various names such as a mobile terminal, a wireless device, a Wireless Transmit / Receive Unit (WTRU), a User Equipment (UE), a Mobile Station (MS), a Mobile Subscriber Unit, or simply a user. The STA (110, 120) of the present specification may also be referred to by various names such as a network, a base station, a Node-B, an access point (AP), a repeater, a router, a relay, etc. The STA (110, 120) of the present specification may also be referred to by various names such as a receiving apparatus, a transmitting apparatus, a receiving STA, a transmitting STA, a receiving device, a transmitting device, etc.

[0057] For example, STA (110, 120) may perform the role of an AP (access point) or a non-AP role. That is, STA (110, 120) of the present specification may perform the functions of an AP and / or a non-AP. In the present specification, AP may also be indicated as an AP STA.

[0058] The STA (110, 120) of this specification can support various communication standards other than the IEEE 802.11 standard. For example, it can support communication standards according to the 3GPP standard (e.g., LTE, LTE-A, 5G NR standard). In addition, the STA of this specification can be implemented in various devices such as a mobile phone, a vehicle, a personal computer, etc. In addition, the STA of this specification can support communication for various communication services such as voice calls, video calls, data communications, and autonomous driving (self-driving, autonomous-driving).

[0059] In this specification, STA (110, 120) may include a medium access control (MAC) and a physical layer interface for a wireless medium that follow the provisions of the IEEE 802.11 standard.

[0060] Based on the sub-drawing (a) of Fig. 1, STA (110, 120) is described as follows.

[0061] The first STA (110) may include a processor (111), a memory (112), and a transceiver (113). The illustrated processor, memory, and transceiver may each be implemented as separate chips, or at least two blocks / functions may be implemented through a single chip.

[0062] The transceiver (113) of the first STA performs signal transmission and reception operations. Specifically, it can transmit and receive IEEE 802.11 packets (e.g., IEEE 802.11a / b / g / n / ac / ax / be, etc.).

[0063] For example, the first STA (110) can perform the intended operation of the AP. For example, the processor (111) of the AP can receive a signal through the transceiver (113), process the received signal, generate a transmission signal, and perform control for signal transmission. The memory (112) of the AP can store a signal received through the transceiver (113) (i.e., a reception signal) and store a signal to be transmitted through the transceiver (i.e., a transmission signal).

[0064] For example, the second STA (120) can perform the intended operation of a non-AP STA. For example, the transceiver (123) of the non-AP performs signal transmission and reception operations. Specifically, it can transmit and receive IEEE 802.11 packets (e.g., IEEE 802.11a / b / g / n / ac / ax / be, etc.).

[0065] For example, the processor (121) of the Non-AP STA can receive a signal through the transceiver (123), process the received signal, generate a transmission signal, and perform control for signal transmission. The memory (122) of the Non-AP STA can store a signal received through the transceiver (123) (i.e., a reception signal) and store a signal to be transmitted through the transceiver (i.e., a transmission signal).

[0066] For example, in the specification below, the operation of a device indicated as AP may be performed in the first STA (110) or the second STA (120). For example, if the first STA (110) is an AP, the operation of the device indicated as AP may be controlled by the processor (111) of the first STA (110), and a related signal may be transmitted or received through a transceiver (113) controlled by the processor (111) of the first STA (110). In addition, control information related to the operation of the AP or a transmission / reception signal of the AP may be stored in the memory (112) of the first STA (110). In addition, when the second STA (110) is an AP, the operation of the device indicated as an AP is controlled by the processor (121) of the second STA (120), and a related signal can be transmitted or received through a transceiver (123) controlled by the processor (121) of the second STA (120). In addition, control information related to the operation of the AP or the transmission / reception signal of the AP can be stored in the memory (122) of the second STA (110).

[0067] For example, in the specification below, the operation of a device indicated as a non-AP (or User-STA) may be performed in the STA (110) or the second STA (120). For example, if the second STA (120) is a non-AP, the operation of the device indicated as a non-AP may be controlled by the processor (121) of the second STA (120), and a related signal may be transmitted or received through a transceiver (123) controlled by the processor (121) of the second STA (120). In addition, control information related to the operation of the non-AP or the transmission / reception signal of the AP may be stored in the memory (122) of the second STA (120). For example, if the first STA (110) is a non-AP, the operation of a device indicated as a non-AP is controlled by the processor (111) of the first STA (110), and a related signal may be transmitted or received through a transceiver (113) controlled by the processor (111) of the first STA (120). In addition, control information related to the operation of the non-AP or the transmission / reception signal of the AP may be stored in the memory (112) of the first STA (110).

[0068] In the following specification, devices called (transmitting / receiving) STA, first STA, second STA, STA1, STA2, AP, first AP, second AP, AP1, AP2, (transmitting / receiving) Terminal, (transmitting / receiving) device, (transmitting / receiving) apparatus, network, etc. may refer to the STA (110, 120) of FIG. 1. For example, devices indicated as (transmitting / receiving) STA, first STA, second STA, STA1, STA2, AP, first AP, second AP, AP1, AP2, (transmitting / receiving) Terminal, (transmitting / receiving) device, (transmitting / receiving) apparatus, network, etc. without specific drawing symbols may also refer to the STA (110, 120) of FIG. 1. For example, in the example below, the operation of various STAs transmitting and receiving signals (e.g., PPPDU) may be performed by the transceiver (113, 123) of FIG. 1. In addition, in the example below, the operation of various STAs generating transmission and reception signals or performing data processing or calculations in advance for transmission and reception signals may be performed by the processor (111, 121) of FIG. 1.For example, an example of an operation that generates a transmission / reception signal or performs data processing or operation in advance for a transmission / reception signal may include 1) an operation of determining / obtaining / configuring / computing / decoding / encoding bit information of a subfield (SIG, STF, LTF, Data) field included in a PPDU, 2) an operation of determining / configuring / obtaining time resources or frequency resources (e.g., subcarrier resources) used for a subfield (SIG, STF, LTF, Data) field included in a PPDU, 3) an operation of determining / configuring / obtaining a specific sequence (e.g., a pilot sequence, an STF / LTF sequence, an extra sequence applied to SIG) used for a subfield (SIG, STF, LTF, Data) field included in a PPDU, 4) a power control operation and / or a power saving operation applied to an STA, 5) an operation related to determining / obtaining / configuring / computing / decoding / encoding an ACK signal, etc. Additionally, in the examples below, various information (e.g., information related to fields / subfields / control fields / parameters / power, etc.) used by various STAs for determining / acquiring / configuring / computing / decoding / encoding transmission / reception signals can be stored in the memory (112, 122) of FIG. 1.

[0069] The device / STA of the sub-drawing (a) of the above-described FIG. 1 can be modified as in the sub-drawing (b) of FIG. 1. Hereinafter, the STA (110, 120) of the present specification will be described based on the sub-drawing (b) of FIG. 1.

[0070] For example, the transceiver (113, 123) illustrated in sub-drawing (b) of FIG. 1 may perform the same function as the transceiver illustrated in sub-drawing (a) of FIG. 1 described above. For example, the processing chip (114, 124) illustrated in sub-drawing (b) of FIG. 1 may include a processor (111, 121) and a memory (112, 122). The processor (111, 121) and the memory (112, 122) illustrated in sub-drawing (b) of FIG. 1 may perform the same function as the processor (111, 121) and the memory (112, 122) illustrated in sub-drawing (a) of FIG. 1 described above.

[0071] The mobile terminal, wireless device, Wireless Transmit / Receive Unit (WTRU), User Equipment (UE), Mobile Station (MS), Mobile Subscriber Unit, user, user STA, network, Base Station, Node-B, Access Point (AP), repeater, router, relay, receiving device, transmitting device, receiving STA, transmitting STA, receiving Device, transmitting Device, receiving Apparatus, and / or transmitting Apparatus described below may refer to the STA (110, 120) illustrated in the sub-drawings (a) / (b) of FIG. 1, or may refer to the processing chip (114, 124) illustrated in the sub-drawing (b) of FIG. 1. That is, the technical feature of the present specification may be performed in the STA (110, 120) illustrated in the sub-drawings (a) / (b) of FIG. 1, or may be performed only in the processing chip (114, 124) illustrated in the sub-drawings (b) of FIG. 1. For example, the technical feature that the transmitting STA transmits a control signal may be understood as a technical feature that the control signal generated in the processor (111, 121) illustrated in the sub-drawings (a) / (b) of FIG. 1 is transmitted through the transceiver (113, 123) illustrated in the sub-drawings (a) / (b) of FIG. 1. Alternatively, the technical feature that the transmitting STA transmits a control signal may be understood as a technical feature that the control signal to be transmitted to the transceiver (113, 123) is generated in the processing chip (114, 124) illustrated in the sub-drawings (b) of FIG. 1.

[0072] For example, the technical feature of a receiving STA receiving a control signal can be understood as a technical feature of a control signal being received by a transceiver (113, 123) illustrated in sub-drawing (a) of FIG. 1. Alternatively, the technical feature of a receiving STA receiving a control signal can be understood as a technical feature of a control signal received by a transceiver (113, 123) illustrated in sub-drawing (a) of FIG. 1 being acquired by a processor (111, 121) illustrated in sub-drawing (a) of FIG. 1. Alternatively, the technical feature of a receiving STA receiving a control signal can be understood as a technical feature of a control signal received by a transceiver (113, 123) illustrated in sub-drawing (b) of FIG. 1 being acquired by a processing chip (114, 124) illustrated in sub-drawing (b) of FIG.

[0073] Referring to the sub-drawing (b) of FIG. 1, software code (115, 125) may be included in the memory (112, 122). The software code (115, 125) may include instructions that control the operation of the processor (111, 121). The software code (115, 125) may be included in various programming languages.

[0074] The processor (111, 121) or processing chip (114, 124) illustrated in FIG. 1 may include an application-specific integrated circuit (ASIC), another chipset, a logic circuit, and / or a data processing device. The processor may be an application processor (AP). For example, the processor (111, 121) or processing chip (114, 124) illustrated in FIG. 1 may include at least one of a digital signal processor (DSP), a central processing unit (CPU), a graphics processing unit (GPU), and a modem (modulator and demodulator). For example, the processor (111, 121) or processing chip (114, 124) illustrated in FIG. 1 may be a SNAPDRAGON™ series processor manufactured by Qualcomm®, an EXYNOSTM series processor manufactured by Samsung®, an A series processor manufactured by Apple®, a HELIO™ series processor manufactured by MediaTek®, an ATOM™ series processor manufactured by INTEL®, or an enhanced processor thereof.

[0075] In this specification, uplink may mean a link for communication from a non-AP STA to an AP STA, and uplink PPDU / packet / signal, etc. may be transmitted through the uplink. In addition, in this specification, downlink may mean a link for communication from an AP STA to a non-AP STA, and downlink PPDU / packet / signal, etc. may be transmitted through the downlink.

[0076] Figure 2 is a conceptual diagram showing the structure of a wireless local area network (WLAN).

[0077] The upper part of Figure 2 shows the structure of the infrastructure BSS (basic service set) of IEEE (institute of electrical and electronic engineers) 802.11.

[0078] The upper part of Figure 2 shows the structure of the infrastructure BSS (basic service set) of IEEE (institute of electrical and electronic engineers) 802.11.

[0079] Referring to the top of FIG. 2, the wireless LAN system may include one or more infrastructure BSSs (200, 205) (hereinafter, BSS). The BSSs (200, 205) are a collection of APs and STAs, such as an access point (AP) 225 and a station (STA1, 200-1), that have successfully synchronized and can communicate with each other, and are not a concept that designates a specific area. The BSS (205) may also include one or more STAs (205-1, 205-2) that can be associated with one AP (230).

[0080] The BSS may include at least one STA, an AP (225, 230) providing a distribution service, and a distribution system (DS, 210) connecting multiple APs.

[0081] A distributed system (210) can connect multiple BSSs (200, 205) to implement an extended service set (ESS, 240). An ESS (240) can be used as a term to indicate a network formed by connecting one or more APs through the distributed system (210). APs included in a single ESS (240) can have the same SSID (service set identification).

[0082] The portal (portal, 220) can act as a bridge to connect a wireless LAN network (IEEE 802.11) to another network (e.g., 802.X).

[0083] In a BSS such as the upper part of Fig. 2, a network between APs (225, 230) and a network between APs (225, 230) and STAs (200-1, 205-1, 205-2) can be implemented. However, it may also be possible to establish a network and perform communication between STAs without an AP (225, 230). A network that establishes a network and performs communication between STAs without an AP (225, 230) is defined as an ad-hoc network or an independent basic service set (IBSS).

[0084] The bottom of Figure 2 is a conceptual diagram showing IBSS.

[0085] Referring to the bottom of Fig. 2, the IBSS is a BSS that operates in ad-hoc mode. Since the IBSS does not include an AP, there is no centralized management entity. That is, in the IBSS, the STAs (250-1, 250-2, 250-3, 255-4, 255-5) are managed in a distributed manner. In the IBSS, all STAs (250-1, 250-2, 250-3, 255-4, 255-5) can be mobile STAs, and access to the distributed system is not permitted, forming a self-contained network.

[0086] Figure 3 is a diagram illustrating a general link setup process.

[0087] In step S310, the STA may perform a network discovery operation. This network discovery operation may include scanning by the STA. That is, for the STA to access the network, it must find a network it can join. Before joining a wireless network, the STA must identify compatible networks. The process of identifying networks in a specific area is called scanning. Scanning methods include active scanning and passive scanning.

[0088] Figure 3 illustrates a network discovery operation that includes an active scanning process as an example. In active scanning, an STA performing scanning transmits a probe request frame to discover which APs exist in the vicinity while moving between channels and waits for a response. A responder transmits a probe response frame to the STA that transmitted the probe request frame in response to the probe request frame. Here, the responder may be the STA that last transmitted a beacon frame in the BSS of the channel being scanned. In a BSS, the AP transmits the beacon frame, so the AP becomes the responder. In an IBSS, the STAs within the IBSS take turns transmitting beacon frames, so the responder is not constant. For example, an STA that transmits a probe request frame on channel 1 and receives a probe response frame on channel 1 can store BSS-related information included in the received probe response frame and move to the next channel (e.g., channel 2) to perform scanning (i.e., transmitting and receiving probe requests / responses on channel 2) in the same manner.

[0089] Although not shown in the example of FIG. 3, the scanning operation can also be performed in a passive scanning manner. An STA performing scanning based on passive scanning can wait for a beacon frame while moving between channels. A beacon frame is one of the management frames in IEEE 802.11. It announces the presence of a wireless network and is periodically transmitted so that the scanning STA can find the wireless network and participate in the wireless network. In the BSS, the AP periodically transmits the beacon frame, and in the IBSS, the STAs within the IBSS take turns transmitting the beacon frame. When the scanning STA receives a beacon frame, it stores the information about the BSS included in the beacon frame and moves to another channel, recording the beacon frame information on each channel. An STA that receives a beacon frame can store the BSS-related information included in the received beacon frame, move to the next channel, and perform scanning on the next channel in the same manner.

[0090] An STA that discovers a network can perform an authentication process through step S320. This authentication process may be referred to as the first authentication process to clearly distinguish it from the security setup operation of step S340 described below. The authentication process of S320 may include a process in which the STA transmits an authentication request frame to the AP, and the AP responds by transmitting an authentication response frame to the STA. The authentication frame used for the authentication request / response corresponds to a management frame.

[0091] The authentication frame may include information such as an authentication algorithm number, an authentication transaction sequence number, a status code, a challenge text, a Robust Security Network (RSN), and a Finite Cyclic Group.

[0092] An STA can transmit an authentication request frame to an AP. The AP can determine whether to grant authentication to the STA based on the information contained in the received authentication request frame. The AP can provide the result of the authentication process to the STA via an authentication response frame.

[0093] A successfully authenticated STA may perform an association process based on step S330. The association process includes a process in which the STA transmits an association request frame to the AP, and the AP transmits an association response frame to the STA in response. For example, the association request frame may include information related to various capabilities, such as a beacon listen interval, a service set identifier (SSID), supported rates, supported channels, RSN, mobility domain, supported operating classes, a Traffic Indication Map Broadcast request, and interworking service capabilities. For example, the association response frame may contain information related to various capabilities, status codes, Association ID (AID), supported rates, Enhanced Distributed Channel Access (EDCA) parameter sets, Received Channel Power Indicator (RCPI), Received Signal to Noise Indicator (RSNI), mobility domains, timeout interval (association comeback time), overlapping BSS scan parameters, TIM broadcast response, QoS maps, etc.

[0094] In step S340, the STA may perform a security setup process. The security setup process of step S340 may include, for example, a process of setting up a private key through a four-way handshaking using an Extensible Authentication Protocol over LAN (EAPOL) frame.

[0095] Figure 4 illustrates one embodiment of a multi-link (ML).

[0096] As illustrated in FIG. 4, multiple multi-link devices (MLDs) can communicate over a remote link. The MLDs can be categorized into AP MLDs including multiple AP STAs and non-AP MLDs including multiple non-AP STAs. That is, the AP MLD can include affiliated APs (i.e., AP STAs), and the non-AP MLD can include affiliated STAs (i.e., non-AP STAs, or user-STAs).

[0097] A multilink may include a first link and a second link, and different channels / subchannels / frequency resources may be allocated to the first and second links. The first and second multilinks may be identified through a link ID of 4 bits (or other n bits). The first and second links may be configured in the same 2.4 GHz, 5 GHz, or 6 GHz band. Alternatively, the first link and the second link may be configured in different bands.

[0098] The AP MLD of FIG. 4 includes three affiliated APs. In the example of FIG. 4, AP1 may operate in the 2.4 GHz band, AP2 may operate in the 5 GHz band, and AP3 may operate in the 6 GHz band. In the example of FIG. 4, the first link in which AP1 and non-AP1 operate may be defined as a channel / subchannel / frequency resource within the 2.4 GHz band. Furthermore, in the example of FIG. 4, the second link in which AP2 and non-AP2 operate may be defined as a channel / subchannel / frequency resource within the 5 GHz band. Furthermore, in the example of FIG. 4, the third link in which AP3 and non-AP3 operate may be defined as a channel / subchannel / frequency resource within the 6 GHz band.

[0099] In the example of FIG. 4, AP1 may initiate a multi-link setup procedure (ML setup procedure) by transmitting an Association Request frame to non-AP STA1. In the example of FIG. 4, non-AP STA1 may transmit an Association Response frame in response to the Association Request frame. Each AP (e.g., AP1 / 2 / 3) illustrated in FIG. 4 may be identical to the AP illustrated in FIG. 1 and / or FIG. 2, and each non-AP (e.g., non-AP1 / 2 / 3) illustrated in FIG. 4 may be identical to the STA (i.e., user-STA or non-AP STA) illustrated in FIG. 1 and / or FIG. 2.

[0100] The specific features of this specification are not limited to the specific features of FIG. 4. That is, the number of links can be defined in various ways, and multiple links can be defined in various ways within at least one band.

[0101] FIG. 5 illustrates a PPDU (physical protocol data unit or physical layer (PHY) protocol data unit) transmitted / received by an STA of this specification.

[0102] The STA (e.g., AP STA, non-AP STA, AP MLD, non-AP MLD) of the present specification can transmit and / or receive the PPDU of FIG. 5. The PPDU described in the present specification may have, for example, the structure of FIG. 5. In addition, the PPDU described in the present specification may be called by various names such as a transmission PPDU, a reception PPDU, a first type PPDU, or an Nth type PPDU, etc. The PPDU described in the present specification can be used in a WLAN system defined according to IEEE 802.11bn and / or a next-generation WLAN system that improves IEEE 802.11bn.

[0103] The PPDU of FIG. 5 may be related to various PPDU types used in a UHR system. For example, the example of FIG. 5 may be used for at least one of a single-user (SU) mode / type / transmission, a multi-user (MU) mode / type / transmission, and a null data packet (NDP) mode / type / transmission related to channel sounding. For example, if the example of FIG. 5 is related to NDP, the Data field illustrated may be omitted. If the PPDU of FIG. 5 is used for a trigger-based (TB) mode, the UHR-SIG of FIG. 5 may be omitted. In other words, an STA that has received a trigger frame for UL-MU (Uplink-MU) communication may transmit a PPDU with the UHR-SIG omitted in the example of FIG. 5.

[0104] In FIG. 5, L-STF or UHR-LTF may be called a preamble or physical preamble, and may be generated / transmitted / received / acquired / decoded in the physical layer (included in the transmitting / receiving STA).

[0105] Each block illustrated in Fig. 5 may be called a field / subfield / signal, etc. The names of these fields / subfields / signals may be, as illustrated in Fig. 5, L-STF (legacy short training field), L-LTF (legacy long training field), L-SIG (legacy signal), RL-SIG (repeated L-SIG), U-SIG (Universal Signal), UHR-SIG (UHR-signal), etc.

[0106] The subcarrier spacing of the L-STF, L-LTF, L-SIG, RL-SIG, U-SIG, and UHR-SIG fields in FIG. 5 may be set to 312.5 kHz, and the subcarrier spacing of the UHR-STF, UHR-LTF, and Data fields may be set to 78.125 kHz. That is, the tone index (or subcarrier index) of the L-STF, L-LTF, L-SIG, RL-SIG, U-SIG, and UHR-SIG fields may be expressed in units of 312.5 kHz, and the tone index (or subcarrier index) of the UHR-STF, UHR-LTF, and Data fields may be expressed in units of 78.125 kHz.

[0107] In the PPDU of Fig. 5, L-LTF and L-STF may be identical to conventional fields (e.g., non-HT LTF and non-HT STF defined in conventional WLAN standards).

[0108] The L-SIG field of FIG. 5 may include, for example, 24 bits of bit information. For example, the 24 bits of information may include a 4 bit Rate field, a 1 bit Reserved bit, a 12 bit Length field, a 1 bit Parity bit, and a 6 bit Tail bit. For example, the 12 bit Length field may include information about the length or time duration 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, if the PPDU is a non-HT (non-High Throughput), HT (High Throughput), VHT (Very High Throughput) PPDU, or an EHT (extremely high throughput) PPDU or UHR PPDU, the value of the Length field may be determined as a multiple of 3. For example, if the PPDU is a HE PPDU, the value of the Length field may be determined as "a multiple of 3 + 1" or "a multiple of 3 + 2". In other words, for non-HT, HT, VHT PPDU, EHT PPDU, UHR PPDU, the value of the Length field can be determined as a multiple of 3, and for HE (High-Efficiency) PPDU, the value of the Length field can be determined as "a multiple of 3 + 1" or "a multiple of 3 + 2". In other words, the Length field in an UHR PPDU is set to a value satisfying the condition that the remainder is zero when LENGTH is divided by 3.

[0109] For example, (non-AP and AP) STAs can apply BCC encoding based on a code rate of 1 / 2 to the 24 bits of information in the L-SIG field. Then, the transmitting STA can obtain 48 BCC coded bits. BPSK modulation can be applied to the 48 coded bits to generate 48 BPSK symbols. The transmitting STA can map the 48 BPSK symbols to positions excluding the pilot subcarriers {subcarrier index -21, -7, +7, +21} and the DC subcarrier {subcarrier index 0}. As a result, the 48 BPSK symbols can be mapped to subcarrier indices -26 to -22, -20 to -8, -6 to -1, +1 to +6, +8 to +20, and +22 to +26. The transmitting STA can additionally map the signal {-1, -1, -1, 1} to the subcarrier indices {-28, -27, +27, +28}. The above signal can be used for channel estimation for the frequency domain corresponding to {-28, -27, +27, +28}.

[0110] For example, (non-AP and AP) STA can generate RL-SIG, which is generated in the same manner as L-SIG. BPSK modulation can be applied to RL-SIG. Receiving (non-AP and AP) STA can determine whether the received PPDU is a HE PPDU, EHT PPDU, or UHR PPDU based on the presence of RL-SIG. In other words, if RL-SIG is present, receiving (non-AP and AP) STA can determine whether the received PPDU is one of HE PPDU, EHT PPDU, or UHR PPDU. In other words, if RL-SIG is not present, receiving (non-AP and AP) STA can determine whether the received PPDU is one of non-HT PPDU, HT PPDU, or VHT PPDU. In other words, the RL-SIG field is a repeat of the L-SIG field and is used to differentiate an UHR PPDU from a non-HT PPDU, HT PPDU, and VHT PPDU.

[0111] After the RL-SIG in Fig. 5, a U-SIG (Universal SIG) may be inserted. The U-SIG may be called by various names such as the first SIG field, the first SIG, the first type SIG, the control signal, the control signal field, the first (type) control signal, the common control field, and the common control signal.

[0112] A U-SIG can contain N bits of information and can include information for identifying the type of EHT PPDU. For example, a U-SIG can be formed based on two symbols (e.g., two consecutive OFDM symbols). Each symbol (e.g., an OFDM symbol) for a U-SIG can have a duration of 4 microseconds. Each symbol of a U-SIG can be used to transmit 26 bits of information. For example, each symbol of a U-SIG can be transmitted and received based on 52 data tones and 4 pilot tones.

[0113] For example, A bit information (e.g., 52 uncoded bits) can be transmitted through U-SIG, and the first symbol of U-SIG can transmit the first X bits of information (e.g., 26 uncoded bits) out of the total A bit information, and the second symbol of U-SIG can transmit the remaining Y bits of information (e.g., 26 uncoded bits) out of the total A bit information. For example, the transmitting STA can obtain 26 uncoded bits included in each U-SIG symbol. The transmitting STA can perform convolutional encoding (i.e., BCC encoding) based on a rate of R=1 / 2 to generate 52 coded bits, and perform interleaving on the 52 coded bits. The transmitting STA can perform BPSK modulation on the interleaved 52 coded bits to generate 52 BPSK symbols allocated to each U-SIG symbol. A single U-SIG symbol can be transmitted based on 56 tones (subcarriers) from subcarrier index -28 to subcarrier index +28, excluding DC index 0. The 52 BPSK symbols generated by the transmitting STA can be transmitted based on the remaining tones (subcarriers) excluding the pilot tones -21, -7, +7, and +21.

[0114] For example, A bit information (e.g., 52 uncoded bits) transmitted by U-SIG may include a CRC field (e.g., a 4-bit long field) and a tail field (e.g., a 6-bit long field). The CRC field and the tail field may be transmitted through the second symbol of the U-SIG. The CRC field may be generated based on 26 bits allocated to the first symbol of the U-SIG and the remaining 16 bits excluding the CRC / tail field within the second symbol, and may be generated based on a conventional CRC calculation algorithm. In addition, the tail field may be used to terminate the trellis of the convolutional decoder and may be set to, for example, "000000".

[0115] The A bit information (e.g., 52 uncoded bits) transmitted by the U-SIG (or U-SIG field) can be divided into version-independent bits and version-dependent bits. For example, the size of the version-independent bits can be fixed or variable. For example, the version-independent bits can be assigned only to the first symbol of the U-SIG, or the version-independent bits can be assigned to both the first symbol and the second symbol of the U-SIG. For example, the version-independent bits and the version-dependent bits can be called by various names, such as the first control bit and the second control bit.

[0116] For example, the version-independent bits of the U-SIG may include a 3-bit PHY version identifier. For example, the 3-bit PHY version identifier may include information related to the PHY version of the transmitted and received PPDU. For example, a first value (e.g., a value of 000) of the 3-bit PHY version identifier may indicate that the transmitted and received PPDU is an EHT PPDU. In addition, a second value (e.g., a value of 001) of the 3-bit PHY version identifier may indicate that the transmitted and received PPDU is an UHR PPDU.

[0117] In other words, when the (AP / non-AP) STA transmits an EHT PPDU, it can set the 3-bit PHY version identifier to the first value. In other words, the receiving (AP / non-AP) STA can determine that the received PPDU is an EHT PPDU based on the PHY version identifier having the first value, and can determine that the received PPDU is an UHR PPDU based on the PHY version identifier having the second value.

[0118] For example, the version-independent bits of U-SIG may include a 1-bit UL / DL flag field. The first value of the 1-bit UL / DL flag field relates to UL communication, and the second value of the UL / DL flag field relates to DL communication.

[0119] For example, the version-independent bits of U-SIG may include information about the length of a transmission opportunity (TXOP) and information about the BSS color ID.

[0120] For example, if a UHR PPDU is classified into various types (e.g., a type related to SU transmission (performed based on UL or DL), a type related to DL transmission, a type related to NDP transmission, a type related to DL non-MU-MIMO, a type related to DL MU-MIMO, a type related to Multi-AP operation, a type related to CBF (Coordinated beamforming), SR (Spatial Reuse), a type related to C-OFDMA (Coordinated OFDMA), a type related to C-TDMA (Coordinated TDMA)), information about the type of the EHT PPDU (e.g., 2-bit or 3-bit information) can be included in the version-dependent bits of the U-SIG.

[0121] For example, a U-SIG may include information about 1) a bandwidth field including information about a bandwidth, 2) a field including information about an MCS technique applied to the UHR-SIG, 3) an indication field including information about whether a dual subcarrier modulation (DCM) technique is applied to the UHR-SIG, 4) a field including information about the number of symbols used for the UHR-SIG, 5) a field including information about whether the UHR-SIG is generated over the entire band, 6) a field including information about the type of UHR-LTF / STF, and 7) a field indicating the length of the UHR-LTF and the CP length.

[0122] Preamble puncturing may be applied to the PPDU of FIG. 5. Preamble puncturing refers to applying puncturing to a portion of the entire bandwidth of the PPDU (e.g., the secondary 20 MHz band). For example, when an 80 MHz PPDU is transmitted, the STA applies puncturing to the secondary 20 MHz band within the 80 MHz band, and can transmit the PPDU only through the primary 20 MHz band and the secondary 40 MHz band.

[0123] For example, the pattern of preamble puncturing can be preset. For example, when the first puncturing pattern is applied, puncturing can be applied only to the secondary 20 MHz band within the 80 MHz band. For example, when the second puncturing pattern is applied, puncturing can be applied only to one of the two secondary 20 MHz bands included in the secondary 40 MHz band within the 80 MHz band. For example, when the third puncturing pattern is applied, puncturing can be applied only to the secondary 20 MHz band included in the primary 80 MHz band within the 160 MHz band (or 80+80 MHz band). For example, when the fourth puncturing pattern is applied, a primary 40 MHz band included in the primary 80 MHz band within the 160 MHz band (or 80+80 MHz band) may be present, and puncturing may be applied to at least one 20 MHz channel that does not belong to the primary 40 MHz band.

[0124] Information regarding preamble puncturing applied to the PPDU may be included in the U-SIG and / or UHR-SIG. For example, the first field of the U-SIG may include information regarding the contiguous bandwidth of the PPDU, and the second field of the U-SIG may include information regarding preamble puncturing applied to the PPDU.

[0125] For example, U-SIG and UHR-SIG may include information regarding preamble puncturing based on the following method. If the bandwidth of the PPDU exceeds 80 MHz, the U-SIG may be individually configured 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 the first 80 MHz band and a second U-SIG for the second 80 MHz band. In this case, the first field of the first U-SIG may include information regarding the 160 MHz bandwidth, and the second field of the first U-SIG may include information regarding preamble puncturing applied to the first 80 MHz band (i.e., information regarding the preamble puncturing pattern). Additionally, the first field of the second U-SIG may include information about a 160 MHz bandwidth, and the second field of the second U-SIG may include information about preamble puncturing applied to the second 80 MHz band (i.e., information about a preamble puncturing pattern). Meanwhile, the UHR-SIG consecutive to the first U-SIG may include information about preamble puncturing applied to the second 80 MHz band (i.e., information about a preamble puncturing pattern), and the UHR-SIG consecutive to the second U-SIG may include information about preamble puncturing applied to the first 80 MHz band (i.e., information about a preamble puncturing pattern).

[0126] Additionally or alternatively, U-SIG and UHR-SIG may include information regarding preamble puncturing based on the following methods. U-SIG may include information regarding preamble puncturing for all bands (i.e., information regarding preamble puncturing patterns). That is, UHR-SIG may not include information regarding preamble puncturing, and only U-SIG may include information regarding preamble puncturing (i.e., information regarding preamble puncturing patterns).

[0127] U-SIGs can be configured in 20 MHz units. For example, if an 80 MHz PPDU is configured, U-SIGs can be duplicated. That is, four identical U-SIGs can be included within an 80 MHz PPDU. PPDUs exceeding the 80 MHz bandwidth can contain different U-SIGs.

[0128] The UHR-SIG of FIG. 5 may include control information for a receiving STA. The UHR-SIG may be transmitted via at least one symbol, and each symbol may have a length of 4 us. Information regarding the number of symbols used for the UHR-SIG may be included in the U-SIG.

[0129] UHR-SIG provides additional signals to the U-SIG field to enable STAs to interpret / decode UHR PPDUs. The UHR-SIG field may contain U-SIG overflow bits that are common to all users. The UHR-SIG field also contains resource allocation information, allowing STAs to look up resources used in fields containing data fields / UHR-STF / UHR-LTF (i.e., UHR modulated fields of an UHR PPDU).

[0130] The frequency resources of the UHR-LTF, UHR-STF, and data fields illustrated in FIG. 5 can be determined based on RUs (resource units) defined by multiple subcarriers / tones. That is, the UHR-LTF, UHR-STF, and data fields of this specification can be transmitted / received through RUs (resource units) defined by multiple subcarriers / tones.

[0131] FIG. 6 is a diagram illustrating the layout of resource units (RUs) used for a 20 MHz PPDU. That is, the UHR-LTF, UHR-STF, and / or data fields included in the 20 MHz PPDU can be transmitted / received through at least one of the various RUs defined in FIG. 6.

[0132] As shown at the top of Fig. 6, 26 units (i.e., units corresponding to 26 tones) can be arranged. Six tones can be used as a guard band in the leftmost band of the 20 MHz band, and five tones can be used as a guard band in the rightmost band of the 20 MHz band. In addition, seven DC tones can be inserted in the center band, i.e., the DC band, and 26 units corresponding to 13 tones can exist on each side of the DC band. In addition, 26 units, 52 units, and 106 units can be allocated to other bands. Each unit can be allocated for a receiving station, i.e., a user.

[0133] Meanwhile, the RU arrangement of FIG. 6 is utilized not only in a situation for multiple users (MUs) but also in a situation for a single user (SU), in which case it is possible to use one 242-unit as shown at the bottom of FIG. 4, in which case three DC tones can be inserted.

[0134] In the example of Fig. 6, RUs of various sizes, such as 26-RU, 52-RU, 106-RU, and 242-RU, are proposed. Since the specific sizes of these RUs can be expanded or increased, the present embodiment is not limited to the specific size of each RU (i.e., the number of corresponding tones). In this specification, N-RU may be represented as N-tone RU, etc. For example, 26-RU may be represented as 26-tone RU.

[0135] Figure 7 is a diagram showing the layout of resource units (RUs) used for 40MHz PPDU.

[0136] As in the example of Fig. 6 where RUs of various sizes were used, the example of Fig. 7 can also use 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, etc. 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.

[0137] Additionally, as illustrated, 484 RUs may be used when used for a single user. Meanwhile, the specific number of RUs may be changed, as in the example of FIG. 6.

[0138] Figure 8 is a diagram illustrating the layout of resource units (RUs) used for an 80MHz PPDU. The layout of resource units (RUs) used in this specification may vary. For example, the layout of resource units (RUs) used in the 80MHz band may vary.

[0139] Figure 9 illustrates an operation according to UL-MU. As illustrated, a transmitting STA (e.g., AP) may perform channel access through contending (i.e., backoff operation) and transmit a trigger frame (930). That is, the transmitting STA (e.g., AP) may transmit a PPDU including a trigger frame (930). When a PPDU including a trigger frame is received, a TB (trigger-based) PPDU is transmitted after a delay of SIFS.

[0140] TB PPDUs (941, 942) are transmitted at the same time and can be transmitted from multiple STAs (e.g., User STAs) whose AIDs are indicated in the Trigger frame (930). The ACK frame (950) for the TB PPDU can be implemented in various forms.

[0141] Figure 10 shows an example of channels used / supported / defined within the 2.4 GHz band.

[0142] The 2.4 GHz band may be referred to by other names, such as the first band (band). Furthermore, the 2.4 GHz band may refer to a frequency range in which channels with a center frequency adjacent to 2.4 GHz (e.g., channels with a center frequency between 2.4 and 2.5 GHz) are used / supported / defined.

[0143] The 2.4 GHz band may include multiple 20 MHz channels. The 20 MHz within the 2.4 GHz band may have multiple channel indices (e.g., indices 1 through 14). For example, the center frequency of a 20 MHz channel assigned channel index 1 may be 2.412 GHz, the center frequency of a 20 MHz channel assigned channel index 2 may be 2.417 GHz, and the center frequency of a 20 MHz channel assigned channel index N may be (2.407 + 0.005*N) GHz. The channel indices may be referred to by various names, such as channel numbers. The specific numerical values ​​of the channel indices and center frequencies may change.

[0144] Figure 10 exemplarily illustrates four channels within the 2.4 GHz band. The illustrated first frequency region (1010) to fourth frequency region (1040) may each include one channel. For example, the first frequency region (1010) may include channel 1 (a 20 MHz channel having an index of 1). In this case, the center frequency of channel 1 may be set to 2412 MHz. The second frequency region (1020) may include channel 6. In this case, the center frequency of channel 6 may be set to 2437 MHz. The third frequency region (1030) may include channel 11. In this case, the center frequency of channel 11 may be set to 2462 MHz. The fourth frequency region (1040) may include channel 14. In this case, the center frequency of channel 14 may be set to 2484 MHz.

[0145] Figure 11 illustrates an example of channels used / supported / defined within the 5 GHz band.

[0146] The 5 GHz band may be referred to by other names, such as a second band / band, etc. The 5 GHz band may refer to a frequency range in which channels with a center frequency greater than or equal to 5 GHz and less than 6 GHz (or less than 5.9 GHz) are used / supported / defined. Alternatively, the 5 GHz band may include multiple channels between 4.5 GHz and 5.5 GHz. The specific figures shown in FIG. 11 are subject to change.

[0147] Multiple channels within the 5 GHz band include Unlicensed National Information Infrastructure (UNII)-1, UNII-2, UNII-3, and ISM. UNII-1 may be referred to as UNII Low. UNII-2 may include frequency ranges called UNII Mid and UNII-2Extended. UNII-3 may be referred to as UNII-Upper.

[0148] Within the 5 GHz band, multiple channels can be configured, and the bandwidth of each channel can be variously configured, such as 20 MHz, 40 MHz, 80 MHz, or 160 MHz. For example, the 5170 MHz to 5330 MHz frequency domain / range within UNII-1 and UNII-2 can be divided into eight 20 MHz channels. The 5170 MHz to 5330 MHz frequency domain / range can be divided into four channels through a 40 MHz frequency domain. The 5170 MHz to 5330 MHz frequency domain / range can be divided into two channels through an 80 MHz frequency domain. Alternatively, the 5170 MHz to 5330 MHz frequency domain / range can be divided into one channel through a 160 MHz frequency domain.

[0149] Figure 12 illustrates an example of channels used / supported / defined within the 6 GHz band.

[0150] The 6 GHz band may also be referred to by other names, such as the third band / band. The 6 GHz band may refer to the frequency range in which channels with center frequencies above 5.9 GHz are used, supported, or defined. The specific figures shown in Figure 12 are subject to change.

[0151] For example, the 20 MHz channel of FIG. 12 can be defined from 5.940 GHz. Specifically, the leftmost channel among the 20 MHz channels of FIG. 12 can have an index of 1 (or channel index, channel number, etc.), and a center frequency of 5.945 GHz can be assigned. That is, the center frequency of the indexed channel N can be determined as (5.940 + 0.005*N) GHz.

[0152] Accordingly, the indexes (or channel numbers) of the 20 MHz channels of FIG. 12 are 1, 5, 9, 13, 17, 21, 25, 29, 33, 37, 41, 45, 49, 53, 57, 61, 65, 69, 73, 77, 81, 85, 89, 93, 97, 101, 105, 109, 113, 117, 121, 125, 129, 133, 137, 141, 145, 149, 153, 157, 161, 165, 169, 173, 177, 181, 185, 189, 193, It can be 197, 201, 205, 209, 213, 217, 221, 225, 229, 233. Also, according to the (5.940 + 0.005*N) GHz rule mentioned above, the indices of the 40 MHz channels in Fig. 12 can be 3, 11, 19, 27, 35, 43, 51, 59, 67, 75, 83, 91, 99, 107, 115, 123, 131, 139, 147, 155, 163, 171, 179, 187, 195, 203, 211, 219, 227.

[0153] Below, the structure and types / subtypes of MAC frames are described.

[0154] Fig. 13 illustrates an example of a header of a MAC frame. As illustrated, the MAC frame may include a frame control field / information of 2 octets in length, a duration field / information of 2 octets in length, a RA (Receiver Address) field / information of 6 octets in length, and a TA (Transmitter Address) field / information of 6 octets in length. As illustrated in Fig. 13, the four fields may be consecutive to each other. The MAC header of Fig. 13 may be modified in various ways, and a new field may be inserted between the four illustrated fields, or at least one of the illustrated fields may be omitted.

[0155] The MAC header illustrated in Fig. 13 may be positioned at the very front of a MAC frame. That is, the MAC frame may include a MAC header as illustrated in Fig. 13 and MAC body fields / information subsequent to the MAC header. The MAC frame including the MAC header of Fig. 13 is inserted / included in the data field of the PPDU (e.g., UHR PPDU) illustrated in Fig. 5.

[0156] The MAC frames included in the data field of the PPDU of this specification can be classified into various types. For example, the MAC frames of this specification can be classified into control frames, management frames, and data frames.

[0157] For example, the management frame includes Association Request, Association Response, Reassociation Request, Reassociation Response, Probe Request, Probe Response, Beacon, Disassociation, Authentication, and Deauthentication frames / signals defined in conventional WLAN. For the management frame, the values ​​of the type fields (B3 and B2) in FIG. 13 are set to 00. In addition, the values ​​of the subtype fields (B7, B6, B5, B4) in FIG. 13 are as follows: Association Request (0000), Association Response (0001), Reassociation Request (0010), Reassociation Response (0011), Probe Request (0100), Probe Response (0101), Beacon (1000), Disassociation (1010), Authentication (1011), Deauthentication (1100).

[0158] For example, the control frame includes Trigger Beamforming Report Poll, NDP Announcement (NDPA), Control Frame Extension, Control Wrapper, Block Ack Request (BlockAckReq), Block Ack (BlockAck), PS-Poll, RTS, CTS, Ack, and CF-End frames / signals defined in conventional WLAN. For the control frame, the value of the type field (B3 and B2) in FIG. 13 is set to 01. Also, the values ​​of the subtype fields (B7, B6, B5, B4) of FIG. 13 are as follows: Trigger (0010), Beamforming Report Poll (0100), NDP Announcement (0101), Control Frame Extension (0110), Control Wrapper (0111), BlockAckReq (1000), BlockAck (1001), PS-Poll (1010), RTS (1011), CTS (1100), Ack (1101), CF-End (1110).

[0159] For example, the data frame includes (QoS) Data, (QoS) Null, etc. defined in conventional WLAN. For the management frame, the value of the type field (B3 and B2) of Fig. 13 is set to 10.

[0160] The MAC frame / signal used in this specification can be identified through the type field / information and subtype field / information described above. For example, “frame” in this specification can mean a MAC frame in which the type bits B3 and B2 bits in the frame control field of the MAC header are set to 01, and the subtype bits B7, B6, B5, and B4 bits in the frame control field are set to 0010. Various MAC frames described in this specification are inserted / included in the data fields of various PPDUs (e.g., HE / VHT / HE / EHT / UHR PPDUs).

[0161] FIG. 14 illustrates a modified example of a transmitting device and / or a receiving device of the present specification.

[0162] The devices (e.g., AP STA, non-AP STA) illustrated in FIGS. 1 to 4 may be modified as illustrated in FIG. 14. The transceiver (630) of FIG. 14 may be identical to the transceivers (113, 123) of FIG. 1. The transceiver (630) of FIG. 14 may include a receiver and a transmitter.

[0163] The processor (610) of FIG. 14 may be identical to the processor (111, 121) of FIG. 1. Alternatively, the processor (610) of FIG. 14 may be identical to the processing chip (114, 124) of FIG. 1.

[0164] The memory (150) of FIG. 14 may be the same as the memory (112, 122) of FIG. 1. Alternatively, the memory (150) of FIG. 14 may be a separate external memory different from the memory (112, 122) of FIG. 1.

[0165] Referring to FIG. 14, a power management module (611) manages power to a processor (610) and / or a transceiver (630). A battery (612) supplies power to the power management module (611). A display (613) outputs results processed by the processor (610). A keypad (614) receives input to be used by the processor (610). The keypad (614) may be displayed on the display (613). A SIM card (615) may be an integrated circuit used to securely store an international mobile subscriber identity (IMSI) and an associated key used to identify and authenticate a subscriber in a mobile phone device, such as a mobile phone or computer.

[0166] Referring to FIG. 14, the speaker (640) can output sound-related results processed by the processor (610). The microphone (641) can receive sound-related input to be used by the processor (610).

[0167] 1. Definition of a new code rate and modulation combination for applying UEQM (unequal modulation).

[0168] Next Wi-Fi (beyond 802.11be) aims to support ultra-high reliability (UHR) when transmitting signals to STAs. To support this UHR, various technologies are being considered, including high throughput, low latency, and extended range. To achieve this, additional MCS may be considered to improve throughput by increasing spectral efficiency during signal transmission and reception. Additionally or alternatively, unequal modulation (UEQM) technology may be considered. UEQM technology is a technology that considers SNR imbalance across two or more spatial streams (SSs) during MIMO / beamforming transmission. For example, UEQM technology can refer to a technique that uses different modulations (e.g., different constellation mappings) for each SS.

[0169] For example, this specification may propose various technical features related to UEQM technology. Such UEQM technology may be used together with an enhanced / improved MCS set proposed in this specification. Additionally or alternatively, the MCS set proposed in this specification may be used independently of the UEQM technology. That is, the technical operations related to the MCS set of this specification may operate independently of the UEQM technology, and the operations related to the UEQM technology of this specification may operate independently of the MCS set proposed in this specification.

[0170] Below, UEQM technology is described.

[0171] For example, in MIMO / Beamforming transmission, since a signal is transmitted using a beamforming matrix formed based on singular value decomposition (SVD), when transmitting a signal using multiple spatial streams (SS), the MIMO gain or SNR may be concentrated on a limited number of SSs, including the first SS (e.g., the 1st SS). In other words, an imbalance may occur in which the MIMO gain or SNR is concentrated only on at least one SS (or some SSs) including the first SS.

[0172] Below, we explain the imbalance that occurs for a specific SS (e.g., some SS including the first SS) based on channel information formed based on SVD.

[0173] [Mathematical Formula 1]

[0174]

[0175] The singular values ​​(e.g., singular values) of the diagonal matrix of mathematical expression 1 are arranged in descending order of non-zero values. Therefore, when using multiple spatial streams (SS) in this way, a difference in SNR occurs between the SS (spatial streams).

[0176] Figures 15 and 16 are diagrams illustrating an imbalance occurring for at least one SS. An example of Figures 15 and 16 is that when two SSs or four SSs are used at 80 MHz, the first SS (1 st It is related to the SNR difference between the first SS and the remaining SS (e.g., 2nd / 3rd / 4th SS).

[0177] For example, as illustrated in Fig. 15, when Nss (i.e., Number of SS) is 2, the range of the SNR gap between the first SS and the second SS is 7 to 15 dB, and the median value is approximately 10 dB. For example, as illustrated in Fig. 16, when Nss is 4, it can be seen that the second SS has a difference of approximately 5 dB, the third SS has a difference of 11 dB, and the fourth SS has a difference of 18 dB based on the median value.

[0178] When MIMO / beamforming transmission based on multiple SSs is performed as described above, it can be confirmed that an SNR gap occurs between SSs (spatial streams). Since each SS has a different SNR, when transmitting a signal by applying the same MCS during MIMO / beamforming transmission, the signal transmission efficiency may decrease due to the SNR gap. Therefore, it is technically advantageous to consider the SNR gap for each SS during MIMO or beamforming transmission and apply different modulations suitable for the SNR of each SS. In other words, by applying UEQM, it is possible to apply modulations suitable for the individual SNRs of SSs (spatial streams), and based on this, signal transmission efficiency and throughput can be improved.

[0179] For example, UEQM in this specification means applying a first MCS technique to a first SS and applying a second MCS technique to a second SS. For example, the first MCS technique may be the same as or different from the second MCS technique. In other words, MCS techniques applied to different SSs can be individually set. For example, a plurality of MCS techniques related to UEQM (e.g., the first MCS technique and the second MCS technique) can be configured / set based on the same code rate. For example, a plurality of MCS techniques related to UEQM (e.g., the first MCS technique and the second MCS technique) can be based on a constellation mapping technique / technology that is based on the same code rate, but is individually set.

[0180] In other words, when applying different modulations to different SSs (e.g., applying the first MCS technique to the first SS and the second MCS technique to the second SS), the code rate can be fixed to the same value as described above to reduce implementation complexity without requiring an additional encoder. Accordingly, multiple MCS techniques (e.g., the first MCS technique and the second MCS technique) can be based on the same code rate, but can apply modulations (e.g., constellation mapping technique / technique) that are individually set.

[0181] For example, the UEQM described below can be used for SU / MU transmission (or reception), SU-MIMO / MU-MIMO / non-MU-MIMO transmission (or reception), and OFDMA / non-OFDMA transmission (or reception). Additionally or alternatively, the UEQM described below can be applied to RUs of various sizes (e.g., 26 / 52 / 106 / 242 / 484 / 996 / n*996-tone RUs). For example, the UEQM described below can be applied to RRUs (regular RUs), DRUs (distributed RUs), and / or MRUs (e.g., small / large size MRUs).

[0182] For example, a new set of MCS parameters (or indices / levels) can be defined with respect to the UEQM of this specification (or independently of the UEQM). For example, a new combination of code rate and modulation (i.e., constellation mapping) that was not previously applied can be defined, as follows.

[0183] For example, with respect to the UEQM of this specification, the MCS parameter set based on code rate 1 / 2 may be at least one of the following MCS parameters.

[0184] 1A parameter: 1 / 2 + 64 QAM (Quadrature Amplitude Modulation)

[0185] 2A parameter: 1 / 2 + 256 QAM

[0186] 3A parameter: 1 / 2 + 1024 QAM

[0187] 4A parameter: 1 / 2 + 4096 QAM

[0188] For example, with respect to the UEQM of this specification, a set of MCS parameters based on code rate 2 / 3 may be at least one of the following MCS parameters.

[0189] 1B parameter: 2 / 3 + QPSK (Quadrature Phase Shift Keying)

[0190] 2B parameter: 2 / 3 + 16 QAM

[0191] 3B parameter: 2 / 3 + 256 QAM

[0192] 4B parameter: 2 / 3 + 1024 QAM

[0193] Parameter 5B: 2 / 3 + 4096 QAM

[0194] For example, with respect to the UEQM of this specification, the MCS parameter set based on code rate 5 / 6 may be at least one of the following MCS parameters.

[0195] 1C parameter: 5 / 6 + 16 QAM

[0196] The various parameters described above can be used for UEQM. Additionally or alternatively, the various parameters described above can be used independently of UEQM. For example, at least one of the various MCS parameters described above can be allocated / used for a single SS (spatial stream) in relation to SU / OFDMA transmission / reception.

[0197] Among the various MCS parameters described above, it is also possible to utilize only some of the MCS parameters considering throughput gain and spectral efficiency. For example, the following four MCS parameters can be additionally used in the IEEE 802.11bn system (or UHR system). Additionally or alternatively, the following four MCS parameters can also be additionally used in the next-generation WLAN / WIFI system that further improves the IEEE 802.11bn system. The following four MCS parameters can be called by various names such as extended / enhanced / improved / UHR-MCS parameter / index, etc. The number of extended MCS parameters can be four or more.

[0198] Additionally or alternatively, examples of Extended MCS parameters proposed in the present specification may be QPSK-2 / 3, 16QAM-2 / 3, 16QAM-5 / 6, 256QAM-2 / 3. In addition to the 16 MCS parameters (MCS0 to MCS15 in Table 1 below) proposed in conventional wireless LAN standards, four Extended MCS parameters of the present specification are represented in a table as follows. Additionally or alternatively, Modulation related to MCS parameters / indexes / levels in Table 1 below and the present specification may mean constellation mapping, and may mean, for example, Binary Phase Shift Keying (BPSK), QPSK, 16QAM, 64QAM, 256QAM, 1024QAM, and / or 4096QAM. Additionally or alternatively, in Table 1 below and in the present specification, code rate represents the ratio of the actual information bit length k to the encoded codeword length n, and may be expressed as, for example, k / n, and may mean, for example, 1 / 2, 3 / 4, 2 / 3, and / or 5 / 6.

[0199] MCS indexModulationCode rateMCS0BPSK1 / 2MCS1QPSK1 / 2MCS2QPSK3 / 4MCS316QAM1 / 2MCS416QAM3 / 4MCS564QAM2 / 3MCS664QAM3 / 4MCS764QAM5 / 6MCS8256QAM3 / 4MCS9256QAM5 / 6MCS101024QAM 3 / 4MCS111024QAM5 / 6MCS124096QAM3 / 4MCS134096QAM5 / 6MCS14BPSK-DCM+DUP1 / 2MCS15BPSK-DCM1 / 2MCS16QPSK2 / 3MCS1716QAM2 / 3MCS1816QAM5 / 6MCS19256QAM2 / 3

[0200] The four newly proposed MCS parameters are expressed as MCS16 to MCS19 in Table 1. That is, MCS0 to MCS15 are the same as the existing EHT MCS table. However, the order of the various MCS parameters expressed in Table 1 may be changed in consideration of various factors such as data rate and / or throughput. In particular, MCS16 to MCS 19 may have new indices. For example, MCS17 may be QPSK-2 / 3, MCS19 may be 16QAM-2 / 3, MCS20 may be 16QAM-5 / 6, and MCS23 may be 256QAM-2 / 3. Table 2 below is an MCS table expressing the four newly proposed MCS parameters as MCS17, MCS19, MCS20, and MCS23.

[0201] MCS indexModulationCode rateMCS0BPSK1 / 2MCS1QPSK1 / 2MCS2QPSK3 / 4MCS316QAM1 / 2MCS416QAM3 / 4MCS564QAM2 / 3MCS664QAM3 / 4MCS764QAM5 / 6MCS8256QAM3 / 4MCS9256QAM5 / 6MCS101024QAM 3 / 4MCS111024QAM5 / 6MCS124096QAM3 / 4MCS134096QAM5 / 6MCS14BPSK-DCM+DUP1 / 2MCS15BPSK-DCM1 / 2MCS17QPSK2 / 3MCS1916QAM2 / 3MCS2016QAM5 / 6MCS23256QAM2 / 3

[0202] Additionally, Table 3 below is an MCS table expressing the four newly proposed MCS parameters as MCS2, MCS5, MCS7, and MCS11.

[0203] MCS indexModulationNbpscsCode rateMCS0BPSK11 / 2MCS1QPSK21 / 2MCS2QPSK22 / 3MCS3QPSK23 / 4MCS416QAM41 / 2MCS516QA M42 / 3MCS616QAM43 / 4MCS716QAM45 / 6MCS864QAM62 / 3MCS964QAM63 / 4MCS1064QAM65 / 6MCS 11256QAM82 / 3MCS12256QAM83 / 4MCS13256QAM85 / 6MCS141024QAM103 / 4MCS151024QAM105 / 6MCS164096QAM123 / 4MCS174096QAM125 / 6MCS18BPSK-DCM+DUP11 / 2MCS19BPSK-DCM11 / 2

[0204] Below, UEQM technology / transmission is described in relation to MCS parameters.

[0205] For example, UEQM transmission can be considered when NSS is 1, 2, 3, or 4. Additionally, the number of NSS can be varied in general. UEQM transmission can support different numbers of NSS for DL ​​transmission and UL transmission. For example, UEQM related to DL can support up to 4 NSS, UEQM related to UL can support up to 2 / 3 / 4 NSS. For example, UEQM related to DL can support up to 5 / 6 / 7 / 8 NSS, UEQM related to UL can support up to 2 / 3 / 4 / 5 / 6 / 7 / 8 NSS.

[0206] For example, Table 4 below relates to UEQM supporting up to 4 NSSs. For example, if 2 NSSs are supported, a modulation (e.g., constellation mapping) indicated by M may be applied to the first SS as shown in the table below. In this case, a modulation (e.g., constellation mapping) indicated by M-1 or M-2 may be applied to the second SS.

[0207] For example, if three NSSs are supported, a modulation (e.g., constellation mapping) indicated by M may be applied to the first SS, as shown in the table below. In this case, a modulation (e.g., constellation mapping) indicated by M or M-1 may be applied to the second SS. In this case, a modulation (e.g., constellation mapping) indicated by M-1 or M-2 may be applied to the third SS.

[0208] For example, if up to 4 Nss are supported, the modulation for the 1st / 2nd / 3rd / 4th SS can be set / configured based on M, M-1, and M-2 in the manner shown in Table 4 below based on the above-described method.

[0209] Total Nss1st ss2nd ss3rd ss4th ss2ssMM-1 MM-2 3ssMMM-1 MMM-2 MM-1M-2 4ssMMMM-1MMMM-2MMM-1M-2MM-1M-1M-2

[0210] Applying individual constellations to different SSs, as described above, can be called UEQM. For example, when UEQM is applied, the constellations (or constellation indices / parameters) applied to different SSs can be identical. However, even when UEQM is applied, it is desirable for the code rates applied to different SSs to be identical.

[0211] With respect to the above UEQM pattern field, the M is a constellation index indicated by a separate MCS field (e.g., a 5-bit field included in a SIG field or a Trigger frame, etc.), and the M-1 may be a constellation that is one order lower than M, and the M-2 may be a constellation that is two orders lower than M. For example, if M is 4096QAM, M-1 may mean 1024QAM, and M-2 may mean 256QAM. For example, if M is 1024QAM, M-1 may mean 256QAM, and M-2 may mean 64QAM. For example, if M is 256QAM, M-1 may mean 64QAM, and M-2 may mean 16QAM. For example, M could mean 16QAM, M-1 could mean QPSK, and M-2 could mean BPSK. For example, if M is QPSK, M-1 could mean BPSK.

[0212] Additionally or alternatively, M in the present specification and / or Table 4 above may be a constellation index / parameter greater than or equal to 16QAM and less than or equal to 1024QAM (or 4096 QAM).

[0213] As described above, the newly defined MCS and UEQM signal transmission and reception using it can be defined according to the STA's capabilities. To efficiently utilize the new MCS and UEQM according to the STA's capabilities, UHR or next Wi-Fi defines the STA capabilities as follows to improve the reliability of signal transmission using the new MCS and UEQM.

[0214] 2. Include the UEQM support field in the PHY capabilities information field.

[0215] Next Wi-Fi (beyond 802.11be) aims to support ultra-high reliability when transmitting signals to STAs, and various technologies are being considered for high throughput, low latency, and extended range support. To this end, next Wi-Fi / 802.11bn is considering applying unequal modulation (i.e., UEQM), which considers SNR imbalance of each spatial stream when transmitting MIMO / beamforming using two or more spatial streams and transmits signals by applying different modulations to each spatial stream. In this specification, we define a method for performing a TB (Trigger Based) sounding sequence to obtain information about the modulation applied to each spatial stream when transmitting and receiving signals using UEQM during SU transmission.

[0216] In order to transmit and receive signals using UEQM in 802.11bn or next Wi-Fi, support for UEQM can be determined between the AP and STA through a capability exchange, and the STA's support for UEQM can be defined through a capability. For example, support for UEQM can be defined as follows through the PHY capability of UHR or next Wi-Fi.

[0217] 2-1) Extend the PHY Capabilities Information field of EHT to include the UEQM support field.

[0218] For example, the PHY Capabilities Information field of UHR or next wi-fi can be configured by extending the PHY Capabilities Information field of EHT, and at this time, it can be configured by including the UEQM support field as shown in Fig. 17.

[0219] Figure 17 illustrates an example of a PHY capabilities information field format including a UEQM support field.

[0220] Referring to Figure 17, when the UEQM (UnEqualModulation) Support field is set to 1, it indicates UEQM support, and when the UEQM Support field is set to 0, it indicates that UEQM is not applied. This is an example and can be set in reverse.

[0221] The above is an example, and whether UEQM is supported can be defined as a subfield of the PHY capabilities information field of the newly defined UHR / next Wi-Fi.

[0222] The UEQM (UnEqualModulation) Support field is an example and can be defined with other field names.

[0223] The above frame exchange is performed through an Association request / response or probe request / response frame, and whether UEQM is supported can be determined through the above frame exchange.

[0224] 2-2) Defined as a subfield of the UHR PHY capabilities information field of the newly defined UHR / next Wi-Fi

[0225] As another example, the proposed UEQM (UnEqualModulation) Support field can be transmitted by being included in a separately configured UHR PHY Capabilities Information field. That is, the present specification can propose a UHR PHY capabilities information field that includes the UEQM support field. Alternatively, the present specification can propose a field that extends the EHT PHY Capabilities Information field that includes the UEQM support field.

[0226] 3. Define capability information to indicate whether trigger-based sounding sequence is supported for a single STA.

[0227] As described above, whether to transmit UEQM is set through association or capabilities negotiation with the AP, and the AP can transmit signals by applying different modulations for each SS when transmitting SU or MU using UEQM. In order to apply different modulations for each SS during MIMO transmission, the AP can perform sounding to measure the channel status for each SS with the STA. In this specification, a method for using a TB sounding sequence to efficiently apply UEQM during SU transmission is proposed.

[0228] In order to define a trigger-based sounding sequence for a single STA, information about whether it is supported can be defined as capability information.

[0229] The above capability information may be defined as Trigger based sounding for single STA, and the above capability information may be included in the PHY capabilities information field.

[0230] For example, the above information may be configured to be included in a UHR PHY Capabilities Information field or an EHT PHY Capabilities Information field.

[0231] Trigger based sounding for single STA defined as above can be composed of 1 bit, and when the Trigger based sounding for single STA field is set to 1, it can indicate that TB sounding sequence performance for single STA is supported.

[0232] The above Trigger based sounding for single STA field may be used only when the UEQM (UnEqualModulation) Support field included in the capabilities information field is set to 1, or may be used regardless of the setting of the UEQM (UnEqualModulation) Support field.

[0233] When used in conjunction with the UEQM (UnEqualModulation) Support field, if the UEQM (UnEqualModulation) Support field is set to 1 to support UEQM, the Trigger based sounding for single STA field can be used to indicate whether a non-AP STA supports a TB sounding sequence for UEQM transmission when transmitting SU.

[0234] For example, the PHY Capabilities Information field of UHR or next Wi-Fi can be configured by extending the PHY Capabilities Information field of EHT, and at this time, it can be configured as in Fig. 18, including the proposed fields.

[0235] Figure 18 illustrates an example of a PHY capabilities information field format including a Trigger based sounding for single STA field.

[0236] As shown in Fig. 18, when the Trigger based sounding for single STA field included in the capabilities information field is set to 1, the AP can perform sounding to measure channel status using the TB sounding sequence when performing sounding for a single STA.

[0237] 4. Performing a TB sounding sequence for a single STA

[0238] The TB sounding sequence for a single STA is defined as in Fig. 19.

[0239] Figure 19 illustrates an example of a UHR TB sounding procedure for a single STA.

[0240] As shown in Fig. 19, when performing TB sounding for a single STA, the NDPA (Null Data Packet Announcement) transmitted by the UHR beamformer is configured as shown in Fig. 20.

[0241] Figure 20 illustrates an example of a UHR NDPA frame format.

[0242] Referring to Figure 20, the RA (Receiver Address) field of NDPA is configured with an AID (Association Identifier) ​​for the addressed STA.

[0243] NDPA consists of one STA info field.

[0244] One STA info field included in NDPA consists of an AID for the addressed STA.

[0245] The above one STA info field includes measurement information or FB (Feedback) information of a single STA during sounding. That is, the above one STA info field is transmitted including information about FB type, Ng, and codebook size.

[0246] After transmitting the above NDPA, the beamformer transmits the NDP to the beamformee after a SIFS (Short Inter Frame Space). The beamformee estimates the channel through the NDP using the information in the received NDPA, and transmits the measured information to the beamformer after receiving the BFRP (Beamforming Report Poll) trigger frame transmitted by the beamformer.

[0247] As an example, the beamformer can be an AP, and the beamformee can be a non-AP STA.

[0248] As described above, by accurately signaling the information the AP needs to obtain by using the TB sounding sequence to perform UEQM transmission during SU transmission, the efficiency of UEQM transmission can be improved. Furthermore, by reusing the existing sounding sequence and feedback information when defining sounding for SU UEQM transmission, this can be accomplished without additional overhead.

[0249] Fig. 21 is a flowchart illustrating the operation of a transmitting device according to the present embodiment.

[0250] An example of FIG. 21 may be performed at a transmitting STA or transmitting device (AP and / or non-AP STA).

[0251] Some of the steps (or detailed sub-steps described below) in the example of Fig. 21 may be omitted or changed.

[0252] Through step S2110, the transmitting device (transmitting STA) can obtain information regarding the aforementioned Tone Plan. As described above, the information regarding the Tone Plan includes the size and location of the RU, control information related to the RU, information regarding the frequency band in which the RU is included, information regarding the STA receiving the RU, etc.

[0253] Through step S2120, the transmitting device can configure / generate a PPDU based on the acquired control information. The step of configuring / generating the PPDU may include a step of configuring / generating each field of the PPDU. That is, step S2120 may include a step of configuring a UHR-SIG field including control information regarding a Tone Plan. That is, step S2120 may include a step of configuring a field including control information indicating the size / position of the RU (e.g., an N bitmap) and / or a step of configuring a field including an identifier (e.g., an AID) of an STA receiving the RU.

[0254] Additionally, step S2120 may include a step of generating an STF / LTF sequence to be transmitted through a specific RU. The STF / LTF sequence may be generated based on a preset STF generation sequence / LTF generation sequence.

[0255] Additionally, step S2120 may include a step of generating a data field (i.e., an MPDU) to be transmitted via a specific RU. The step of generating the data field may include a step of configuring it by applying UEQM / EQM.

[0256] The transmitting device can transmit the PPDU configured through step S2120 to the receiving device based on step S2130.

[0257] While performing step S2130, the transmitting device may perform at least one of operations such as CSD, Spatial Mapping, IDFT / IFFT operation, and GI insertion.

[0258] A signal / field / sequence configured according to this specification can be transmitted in the form of FIG. 5.

[0259] Fig. 22 is a flowchart illustrating the operation of a receiving device according to the present embodiment.

[0260] The above-described PPDU can be received according to an example of FIG. 25.

[0261] An example of FIG. 22 may be performed at a receiving STA or receiving device (AP and / or non-AP STA).

[0262] Some of the steps (or detailed sub-steps described below) in the example of Fig. 22 may be omitted.

[0263] A receiving device (receiving STA) may receive all or part of a PPDU through step S2210. The received signal may have the form of FIG. 5.

[0264] The sub-step of step S2210 can be determined based on step S2130 of Fig. 21. That is, step S2210 can perform an operation to restore the results of the CSD, Spatial Mapping, IDFT / IFFT operations, and GI insert operations applied in step S2130.

[0265] At step S2220, the receiving device can decode all or part of the PPDU. Additionally, the receiving device can obtain control information related to the Tone Plan (i.e., RU) from the decoded PPDU.

[0266] More specifically, the receiving device can decode the L-SIG, U-SIG, and UHR-SIG of the PPDU based on the Legacy STF / LTF, and obtain information included in the L-SIG, U-SIG, and UHR SIG fields. Information regarding various Tone Plans (i.e., RUs) described herein can be included in the UHR-SIG, and the receiving STA can obtain information regarding the Tone Plan (i.e., RUs) through the UHR-SIG. In addition, information regarding the application of UEQM / EQM can be obtained through the UHR-SIG.

[0267] In step S2230, the receiving device can decode the remaining portion of the PPDU based on the information about the Tone Plan (i.e., RU) and UEQM / EQM acquired through step S2220. For example, the receiving STA can decode the STF / LTF field of the PPDU based on the information about one Plan (i.e., RU). In addition, the receiving STA can decode the data field of the PPDU based on the information about the Tone Plan (i.e., RU) and the UEQM / EQM information, and acquire the MPDU included in the data field.

[0268] Additionally, the receiving device may perform a processing operation to transmit the decoded data to a higher layer (e.g., MAC layer) through step S2230. Furthermore, if the generation of a signal is instructed from the higher layer to the PHY layer in response to the data transmitted to the higher layer, a subsequent operation may be performed.

[0269] Hereinafter, the above-described embodiment will be described with reference to FIGS. 1 to 22.

[0270] FIG. 23 is a flowchart illustrating a trigger-based sounding procedure for a transmitting STA to transmit SU by applying UEQM according to the present embodiment.

[0271] An example of FIG. 23 can be performed in a network environment that supports a next-generation wireless LAN system (UHR (Ultra High Reliability) wireless LAN system or next wi-fi). The next-generation wireless LAN system is a wireless LAN system that improves on the 802.11be system and can satisfy backward compatibility with the 802.11be system.

[0272] An example of FIG. 23 is performed at a transmitting STA, which may correspond to an access point (AP) or an AP Multi-link Device (AP MLD). The receiving STA of FIG. 23 may correspond to at least one STA (station) or non-AP MLD.

[0273] This embodiment proposes a method for defining a trigger-based sounding procedure for measuring appropriate channel conditions during single-user (SU) transmission using Unequal modulation (UEQM). Specifically, this embodiment proposes a method for defining an NPDA frame by including a field in PHY capability information that can perform a trigger-based sounding procedure for a non-AP STA to which UEQM is applied.

[0274] In step S2310, the transmitting STA (station) generates PHY (Physical) capabilities information and transmits the PHY capabilities information to the receiving STA.

[0275] In step S2320, the transmitting STA transmits an NDPA (Null Data Packet Announcement) frame to the receiving STA based on the PHY capability information.

[0276] The above PHY capability information (UHR PHY capabilities information field) includes first and second fields.

[0277] The first field includes information regarding whether UEQM (Unequal modulation) is supported. For example, based on the first field being set to 1, the first field may indicate that UEQM is applied. Based on the first field being set to 0, the first field may indicate that UEQM is not applied.

[0278] The second field includes information regarding whether trigger-based sounding is performed for one STA. For example, based on the second field being set to 1, the second field may indicate that trigger-based sounding is performed for the one STA (or one non-AP STA). Based on the second field being set to 0, the second field may indicate that trigger-based sounding is not performed for the one STA.

[0279] The above NPDA frame includes a RA (Receiver Address) field and a STA information field.

[0280] Based on the second field being set to 1, the RA field is set to an AID (Association Identifier) ​​for the addressed STA, and the STA information field consists of only one STA information field.

[0281] That is, the present embodiment defines capability information for indicating whether a trigger-based sounding procedure is performed for one STA, and proposes a method for configuring an NPDA frame to perform a trigger-based sounding procedure based on the capability information.

[0282] Accordingly, based on the first field being set to 1, the second field may be used. Conversely, based on the first field being set to 0, the second field may not be used.

[0283] The transmitting STA may transmit an NDP (Null Data Packet) frame to the receiving STA. The transmitting STA may transmit a BFRP (Beamforming Report Poll) trigger frame to the receiving STA. The transmitting STA may receive feedback information triggered based on the BFRP trigger frame from the receiving STA. (The receiving STA may receive an NDP (Null Data Packet) frame from the transmitting STA. The receiving STA may receive a BFRP (Beamforming Report Poll) trigger frame from the transmitting STA. The receiving STA may transmit feedback information triggered based on the BFRP trigger frame to the transmitting STA.)

[0284] The above feedback information may include measurement information on channel states for two or more spatial streams.

[0285] UEQM technology refers to a method of applying different modulations appropriate for the SNR of each spatial stream to prevent imbalance caused by the SNR gap of each spatial stream for multiple spatial streams (for example, when there are two spatial streams, a first MCS is applied to the first spatial stream, and a second MCS is applied to the second spatial stream). By applying the UEQM technology, it is possible to apply modulations appropriate for the individual SNRs of the spatial streams, which has the effect of improving signal transmission efficiency and throughput.

[0286] Accordingly, transmission and reception of signals using the above UEQM can support at least two spatial streams and up to four (or eight) spatial streams.

[0287] The above one STA information field may include an AID for the addressed STA. The addressed STA may be a non-AP (non-access point) STA to which the UEQM is applied.

[0288] The above one STA information field may further include measurement information or feedback information for the addressed STA. The measurement information or feedback information may include information about a feedback type, a feedback subcarrier spacing, and a codebook size.

[0289] That is, the present embodiment proposes a method for exchanging PHY capability information between an AP and a non-AP STA, constructing an NDPA frame based on the PHY capability information, and performing a trigger-based sounding procedure for measuring a channel state for each spatial stream when transmitting SU to one STA. As a result, the trigger-based sounding procedure enables efficient UEQM transmission suitable for the channel condition when transmitting SU, thereby improving the overall throughput and reception performance.

[0290] The above PHY capability information may be defined by adding the first and second fields to the EHT (Extreme High Throughput) capability information field, or may be defined as a UHR (Ultra High Reliability) capability information field.

[0291] The transmitting STA may transmit and receive signals using UEQM with the receiving STA (or one non-AP STA) based on the PHY capability information. For example, if the transmitting STA and the receiving STA support first and second spatial streams, the signals may be transmitted and received by applying a first MCS to the first spatial stream and a second MCS to the second spatial stream. The first MCS and the second MCS may be set to different modulation values.

[0292] The MCS to which the above UEQM is applied may be QPSK (Quadrature Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), 64QAM, 256QAM, 1024QAM, or 4096QAM, and the above UEQM may support code rates of 1 / 2, 3 / 4, or 5 / 6.

[0293] FIG. 24 is a flowchart illustrating a trigger-based sounding procedure for a receiving STA to transmit SU by applying UEQM according to the present embodiment.

[0294] An example of FIG. 24 can be performed in a network environment that supports a next-generation wireless LAN system (UHR (Ultra High Reliability) wireless LAN system or next wi-fi). The next-generation wireless LAN system is a wireless LAN system that improves on the 802.11be system and can satisfy backward compatibility with the 802.11be system.

[0295] An example of FIG. 24 is performed at a receiving STA, which may correspond to at least one STA (station) or non-AP MLD (non-access point Multi-link Device). The transmitting STA of FIG. 24 may correspond to an AP (access point) or AP MLD.

[0296] This embodiment proposes a method for defining a trigger-based sounding procedure for measuring appropriate channel conditions during single-user (SU) transmission using Unequal modulation (UEQM). Specifically, this embodiment proposes a method for defining an NPDA frame by including a field in PHY capability information that can perform a trigger-based sounding procedure for a non-AP STA to which UEQM is applied.

[0297] In step S2410, the receiving STA (station) receives PHY (physical) capabilities information from the transmitting STA.

[0298] In step S2420, the receiving STA receives an NDPA (Null Data Packet Announcement) frame from the transmitting STA based on the PHY capability information.

[0299] The above PHY capability information (UHR PHY capabilities information field) includes first and second fields.

[0300] The first field includes information regarding whether UEQM (Unequal modulation) is supported. For example, based on the first field being set to 1, the first field may indicate that UEQM is applied. Based on the first field being set to 0, the first field may indicate that UEQM is not applied.

[0301] The second field includes information regarding whether trigger-based sounding is performed for one STA. For example, based on the second field being set to 1, the second field may indicate that trigger-based sounding is performed for the one STA (or one non-AP STA). Based on the second field being set to 0, the second field may indicate that trigger-based sounding is not performed for the one STA.

[0302] The above NPDA frame includes a RA (Receiver Address) field and a STA information field.

[0303] Based on the second field being set to 1, the RA field is set to an AID (Association Identifier) ​​for the addressed STA, and the STA information field consists of only one STA information field.

[0304] That is, the present embodiment defines capability information for indicating whether a trigger-based sounding procedure is performed for one STA, and proposes a method for configuring an NPDA frame to perform a trigger-based sounding procedure based on the capability information.

[0305] Accordingly, based on the first field being set to 1, the second field may be used. Conversely, based on the first field being set to 0, the second field may not be used.

[0306] The transmitting STA may transmit an NDP (Null Data Packet) frame to the receiving STA. The transmitting STA may transmit a BFRP (Beamforming Report Poll) trigger frame to the receiving STA. The transmitting STA may receive feedback information triggered based on the BFRP trigger frame from the receiving STA. (The receiving STA may receive an NDP (Null Data Packet) frame from the transmitting STA. The receiving STA may receive a BFRP (Beamforming Report Poll) trigger frame from the transmitting STA. The receiving STA may transmit feedback information triggered based on the BFRP trigger frame to the transmitting STA.)

[0307] The above feedback information may include measurement information on channel states for two or more spatial streams.

[0308] UEQM technology refers to a method of applying different modulations appropriate for the SNR of each spatial stream to prevent imbalance caused by the SNR gap of each spatial stream for multiple spatial streams (for example, when there are two spatial streams, a first MCS is applied to the first spatial stream, and a second MCS is applied to the second spatial stream). By applying the UEQM technology, it is possible to apply modulations appropriate for the individual SNRs of the spatial streams, which has the effect of improving signal transmission efficiency and throughput.

[0309] Accordingly, transmission and reception of signals using the above UEQM can support at least two spatial streams and up to four (or eight) spatial streams.

[0310] The above one STA information field may include an AID for the addressed STA. The addressed STA may be a non-AP (non-access point) STA to which the UEQM is applied.

[0311] The above one STA information field may further include measurement information or feedback information for the addressed STA. The measurement information or feedback information may include information about a feedback type, a feedback subcarrier spacing, and a codebook size.

[0312] That is, the present embodiment proposes a method for exchanging PHY capability information between an AP and a non-AP STA, constructing an NDPA frame based on the PHY capability information, and performing a trigger-based sounding procedure for measuring a channel state for each spatial stream when transmitting SU to one STA. As a result, the trigger-based sounding procedure enables efficient UEQM transmission suitable for the channel condition when transmitting SU, thereby improving the overall throughput and reception performance.

[0313] The above PHY capability information may be defined by adding the first and second fields to the EHT (Extreme High Throughput) capability information field, or may be defined as a UHR (Ultra High Reliability) capability information field.

[0314] The transmitting STA may transmit and receive signals using UEQM with the receiving STA (or one non-AP STA) based on the PHY capability information. For example, if the transmitting STA and the receiving STA support first and second spatial streams, the signals may be transmitted and received by applying a first MCS to the first spatial stream and a second MCS to the second spatial stream. The first MCS and the second MCS may be set to different modulation values.

[0315] The MCS to which the above UEQM is applied may be QPSK (Quadrature Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), 64QAM, 256QAM, 1024QAM, or 4096QAM, and the above UEQM may support code rates of 1 / 2, 3 / 4, or 5 / 6.

[0316] <Device Configuration>

[0317] The technical features of the present specification described above can be applied to various devices and methods. For example, the technical features of the present specification described above can be performed / supported by the devices of FIG. 1 and / or FIG. 14. For example, the technical features of the present specification described above can be applied only to a part of FIG. 1 and / or FIG. 14. For example, the technical features of the present specification described above can be implemented based on the processing chip (114, 124) of FIG. 1, or based on the processor (111, 121) and the memory (112, 122) of FIG. 1, or based on the processor (610) and the memory (620) of FIG. 14. For example, the device of the present specification receives PHY (Physical) capabilities information from a transmitting STA (station); and receives an NDPA (Null Data Packet Announcement) frame from the transmitting STA based on the PHY capabilities information.

[0318] The technical features of this specification can be implemented based on a computer-readable medium (CRM). For example, the CRM proposed by this specification is at least one computer-readable recording medium containing instructions that are executed by at least one processor.

[0319] The CRM may store instructions for performing operations including: receiving PHY (Physical) capabilities information from a transmitting STA (station); and receiving an NDPA (Null Data Packet Announcement) frame based on the PHY capabilities information from the transmitting STA. The instructions stored in the CRM of the present specification may be executed by at least one processor. At least one processor related to the CRM of the present specification may be the processor (111, 121) or the processing chip (114, 124) of FIG. 1, or the processor (610) of FIG. 14. Meanwhile, the CRM of the present specification may be the memory (112, 122) of FIG. 1, the memory (620) of FIG. 14, or a separate external memory / storage medium / disk, etc.

[0320] The technical features of this specification described above are applicable to various applications and business models. For example, the technical features described above can be applied to wireless communication in devices that support artificial intelligence (AI).

[0321] Artificial intelligence (AI) is the study of artificial intelligence or the methodologies for creating it, while machine learning (ML) defines various problems in the field of AI and studies the methodologies for solving them. Machine learning is also defined as an algorithm that improves performance on a task through consistent experience.

[0322] An artificial neural network (ANN) is a model used in machine learning. It can refer to a model with problem-solving capabilities, comprised of artificial neurons (nodes) that form a network through the connection of synapses. An ANN can be defined by the connection patterns between neurons in different layers, the learning process that updates model parameters, and the activation function that generates output values.

[0323] An artificial neural network may include an input layer, an output layer, and optionally one or more hidden layers. Each layer contains one or more neurons, and the artificial neural network may include synapses connecting neurons. In an artificial neural network, each neuron can output a function value of an activation function based on input signals, weights, and biases received through the synapses.

[0324] Model parameters are parameters determined through learning, including synaptic connection weights and neuron biases. Hyperparameters are parameters that must be set before learning in machine learning algorithms, including the learning rate, number of iterations, mini-batch size, and initialization function.

[0325] The goal of artificial neural network training can be seen as determining model parameters that minimize a loss function. The loss function can be used as an indicator for determining optimal model parameters during the artificial neural network training process.

[0326] Machine learning can be classified into supervised learning, unsupervised learning, and reinforcement learning depending on the learning method.

[0327] Supervised learning refers to a method for training an artificial neural network when given labels for the training data. The labels can refer to the correct answer (or output value) that the artificial neural network must infer when the training data is input to the artificial neural network. Unsupervised learning can refer to a method for training an artificial neural network when the training data is not given labels. Reinforcement learning can refer to a learning method in which an agent defined within a certain environment is taught to select actions or action sequences that maximize cumulative rewards in each state.

[0328] Machine learning implemented with a deep neural network (DNN) containing multiple hidden layers among artificial neural networks is also called deep learning, and deep learning is a subset of machine learning. Hereinafter, the term "machine learning" is used to encompass deep learning.

[0329] Additionally, the above-described technical features can be applied to wireless communication of robots.

[0330] A robot can be defined as a machine that automatically performs or operates a given task based on its own capabilities. Specifically, a robot capable of perceiving its environment, making independent judgments, and performing actions can be called an intelligent robot.

[0331] Robots can be categorized into industrial, medical, household, and military applications based on their intended use or field. Robots are equipped with actuators or motors, enabling them to perform various physical actions, such as moving robot joints. Furthermore, mobile robots incorporate wheels, brakes, and propellers into their actuators, enabling them to move on the ground or fly in the air.

[0332] Additionally, the above-described technical features can be applied to devices that support extended reality.

[0333] Extended reality is a general term for virtual reality (VR), augmented reality (AR), and mixed reality (MR). VR technology presents real-world objects and backgrounds as CG images only, AR technology presents virtual CG images over images of real objects, and MR technology is a computer graphics technology that blends and combines virtual objects with the real world.

[0334] MR technology is similar to AR in that it presents both real and virtual objects simultaneously. However, while AR uses virtual objects to complement real objects, MR uses virtual and real objects on an equal footing.

[0335] XR technology can be applied to HMD (Head-Mount Display), HUD (Head-Up Display), mobile phones, tablet PCs, laptops, desktops, TVs, digital signage, etc., and devices to which XR technology is applied can be called XR devices.

[0336] The claims set forth in this specification may be combined in various ways. For example, the technical features of the method claims of this specification may be combined and implemented as a device, and the technical features of the device claims of this specification may be combined and implemented as a method. Furthermore, the technical features of the method claims and the technical features of the device claims of this specification may be combined and implemented as a device, and the technical features of the method claims and the technical features of the device claims of this specification may be combined and implemented as a method.

Claims

1. In a wireless LAN system, A step in which a receiving STA (station) receives PHY (physical) capabilities information from a transmitting STA; and The receiving STA comprises a step of receiving an NDPA (Null Data Packet Announcement) frame from the transmitting STA based on the PHY capability information, The above PHY capability information includes first and second fields, The first field above contains information related to whether UEQM (Unequal modulation) is supported, The second field contains information regarding whether trigger-based sounding is performed for one STA, The above NPDA frame includes an RA (Receiver Address) field and an STA information field, and Based on the second field being set to 1, the RA field is set to an AID (Association Identifier) ​​for the addressed STA, and the STA information field is composed of only one STA information field. method.

2. In paragraph 1, Based on the first field being set to 1, the second field is used method.

3. In paragraph 1, A step in which the receiving STA receives an NDP (Null Data Packet) frame from the transmitting STA; A step in which the receiving STA receives a BFRP (Beamforming Report Poll) trigger frame from the transmitting STA; and The receiving STA further includes a step of transmitting, to the transmitting STA, feedback information triggered based on the BFRP trigger frame, The above feedback information includes measurement information on channel states for two or more spatial streams. method.

4. In paragraph 1, The above one STA information field includes an AID for the addressed STA, The above addressed STA is a non-AP (non-access point) STA to which the UEQM is applied. method.

5. In paragraph 4, The above one STA information field further includes measurement information or feedback information for the addressed STA, The above measurement information or feedback information includes information about the feedback type, the spacing between feedback subcarriers, and the codebook size. method.

6. In paragraph 1, The above PHY capability information is defined by adding the first and second fields to the EHT (Extreme High Throughput) capability information field or defined as the UHR (Ultra High Reliability) capability information field. method.

7. In a wireless LAN system, a receiving STA (station) memory; transceiver; and A processor operatively coupled to the memory and the transceiver, the processor comprising: Receive PHY (Physical) capabilities information from a transmitting STA; and Receive an NDPA (Null Data Packet Announcement) frame based on the PHY capability information from the transmitting STA. The above PHY capability information includes first and second fields, The first field above contains information related to whether UEQM (Unequal modulation) is supported, The second field contains information regarding whether trigger-based sounding is performed for one STA, The above NPDA frame includes an RA (Receiver Address) field and an STA information field, and Based on the second field being set to 1, the RA field is set to an AID (Association Identifier) ​​for the addressed STA, and the STA information field is composed of only one STA information field. Receiving STA.

8. In a wireless LAN system, A step in which a transmitting STA (station) transmits PHY (physical) capabilities information to a receiving STA; and The transmitting STA comprises a step of transmitting an NDPA (Null Data Packet Announcement) frame to the receiving STA based on the PHY capability information, The above PHY capability information includes first and second fields, The first field above contains information related to whether UEQM (Unequal modulation) is supported, The second field contains information regarding whether trigger-based sounding is performed for one STA, The above NPDA frame includes an RA (Receiver Address) field and an STA information field, and Based on the second field being set to 1, the RA field is set to an AID (Association Identifier) ​​for the addressed STA, and the STA information field is composed of only one STA information field. method.

9. In paragraph 8, Based on the first field being set to 1, the second field is used method.

10. In paragraph 8, A step in which the transmitting STA transmits an NDP (Null Data Packet) frame to the receiving STA; The step of the transmitting STA transmitting a BFRP (Beamforming Report Poll) trigger frame to the receiving STA; and The transmitting STA further includes a step of receiving feedback information triggered based on the BFRP trigger frame from the receiving STA, The above feedback information includes measurement information on channel states for two or more spatial streams. method.

11. In paragraph 8, The above one STA information field includes an AID for the addressed STA, The above addressed STA is a non-AP (non-access point) STA to which the UEQM is applied. method.

12. In paragraph 11, The above one STA information field further includes measurement information or feedback information for the addressed STA, The above measurement information or feedback information includes information about the feedback type, the spacing between feedback subcarriers, and the codebook size. method.

13. In paragraph 8, The above PHY capability information is defined by adding the first and second fields to the EHT (Extreme High Throughput) capability information field or defined as the UHR (Ultra High Reliability) capability information field. method.

14. In a wireless LAN system, a transmitting STA (station) memory; transceiver; and A processor operatively coupled to the memory and the transceiver, the processor comprising: Transmit PHY (Physical) capabilities information to the receiving STA; and Transmit an NDPA (Null Data Packet Announcement) frame to the receiving STA based on the PHY capability information. The above PHY capability information includes first and second fields, The first field above contains information related to whether UEQM (Unequal modulation) is supported, The second field contains information regarding whether trigger-based sounding is performed for one STA, The above NPDA frame includes an RA (Receiver Address) field and an STA information field, and Based on the second field being set to 1, the RA field is set to an AID (Association Identifier) ​​for the addressed STA, and the STA information field is composed of only one STA information field. Transmitting STA.

15. At least one computer-readable medium containing instructions based on being executed by at least one processor, A step of receiving PHY (Physical) capabilities information from a transmitting STA (station); and Including a step of receiving an NDPA (Null Data Packet Announcement) frame based on the PHY capability information from the transmitting STA, The above PHY capability information includes first and second fields, The first field above contains information related to whether UEQM (Unequal modulation) is supported, The second field contains information regarding whether trigger-based sounding is performed for one STA, The above NPDA frame includes an RA (Receiver Address) field and an STA information field, and Based on the second field being set to 1, the RA field is set to an AID (Association Identifier) ​​for the addressed STA, and the STA information field is composed of only one STA information field. Recording medium.

16. In a wireless LAN system, in the device, memory; and A processor operatively coupled to the memory, the processor comprising: Receive PHY (Physical) capabilities information from a transmitting STA (station); and Receive an NDPA (Null Data Packet Announcement) frame based on the PHY capability information from the transmitting STA. The above PHY capability information includes first and second fields, The first field above contains information related to whether UEQM (Unequal modulation) is supported, The second field contains information regarding whether trigger-based sounding is performed for one STA, The above NPDA frame includes an RA (Receiver Address) field and an STA information field, and Based on the second field being set to 1, the RA field is set to an AID (Association Identifier) ​​for the addressed STA, and the STA information field is composed of only one STA information field. device.

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