Method and apparatus for allocating resources by restricting RUs and MRUs for an STA operating only at 20 MHz in a wireless LAN system

Abstract

A method and apparatus for setting limited RUs and MRUs in a wireless LAN system are proposed. Specifically, a receiving STA receives a PPDU from a transmitting STA via a pre-configured frequency band and decodes the PPDU. The receiving STA operates only in the 20 MHz band. The PPDU includes a preamble and a data field. The data field is received in resources within the pre-configured frequency band excluding the first RU and the first MRU.

Description

Technical Field

[0001] This specification relates to a technique for restricting and allocating resources in a wireless LAN system, and more specifically, to a method and apparatus for restricting and allocating resources by restricting RU and MRU for a STA that operates only at 20 MHz.

Background Art

[0002] WLAN (wireless local area network) has been improved in various ways. For example, the IEEE802.11ax standard proposed an improved communication environment using OFDMA (orthogonal frequency division multiple access) and DL MU MIMO (downlink multi-user multiple input, multiple output) technologies.

[0003] This specification proposes technical features that can be utilized in new communication standards. For example, the new communication standard is the recently discussed EHT (Extreme high throughput) standard. The EHT standard can use newly proposed increased bandwidth, improved PPDU (PHY layer protocol data unit) structure, improved sequence, HARQ (Hybrid automatic repeat request) technology, etc. The EHT standard can be called the IEEE802.11be standard.

[0004] In the new wireless LAN standard, an increased number of spatial streams are used. In this case, it is necessary to improve the signaling technology in the wireless LAN system in order to appropriately use the increased number of spatial streams.

Summary of the Invention

Problems to be Solved by the Invention

[0005] This specification proposes a method and apparatus for allocating resources by restricting RUs and MRUs for STAs that operate only at 20 MHz in a wireless LAN system.

Means for Solving the Problems

[0006] An example of this specification proposes a method for allocating resources by restricting RUs and MRUs for STAs that operate only at 20 MHz.

[0007] This embodiment can be executed in a network environment supported by a next-generation wireless LAN system (IEEE 802.11be or EHT wireless LAN system). The next-generation wireless LAN system can satisfy backward compatibility with the 802.11ax system as a wireless LAN system that improves the 802.11ax system.

[0008] This embodiment is executed in a receiving STA (station), and the receiving STA can correspond to a non-AP STA that operates only in the 20 MHz band. The transmitting STA can correspond to an AP (access point) STA.

[0009] This embodiment proposes a method for setting RUs and MRUs that cannot be allocated (the allocation is restricted) to STAs that operate only in the 20 MHz band in consideration of the tone plan of the newly defined 80 MHz band in the 802.11be wireless LAN system.

[0010] The receiving STA (station) receives a PPDU (Physical Protocol Data Unit) from the transmitting STA via a previously set frequency band.

[0011] The receiving STA decodes the PPDU.

[0012] The receiving STA is a STA that operates only in the 20 MHz band.

[0013] The PPDU includes a preamble and a data field. The data field is received in a resource excluding a first RU (Resource Unit) and a first MRU (Multiple RUs) among the already set frequency bands. The first MRU is newly defined in an 802.11be wireless LAN system as a multiple RU in which two RUs are aggregated with each other.

[0014] When the already set frequency band is a 40 MHz band, the arrangement (or tone plan) of RUs for the 40 MHz band is as follows. The tone plan for the 40 MHz band is the same in 802.11ax and 802.11be wireless LAN systems.

[0015] When the 40 MHz band is composed of only 26 - tone RUs, the 40 MHz band includes the 1st to 18th 26 - tone RUs. When the 40 MHz band is composed of only 52 - tone RUs, the 40 MHz band includes the 1st to 8th 52 - tone RUs. When the 40 MHz band is composed of only 106 - tone RUs, the 40 MHz band includes the 1st to 4th 106 - tone RUs. When the 40 MHz band is composed of only 242 - tone RUs, the 40 MHz band includes the 1st and 2nd 242 - tone RUs.

[0016] At this time, the 1st to 18th 26 - tone RUs are arranged in the order from the 26 - tone RU with a lower frequency to the 26 - tone RU with a higher frequency. The 1st to 8th 52 - tone RUs are arranged in the order from the 52 - tone RU with a lower frequency to the 52 - tone RU with a higher frequency. The 1st to 4th 106 - tone RUs are arranged in the order from the 106 - tone RU with a lower frequency to the 106 - tone RU with a higher frequency. The 1st and 2nd 242 - tone RUs are arranged in the order from the 242 - tone RU with a lower frequency to the 242 - tone RU with a higher frequency.

[0017] The first RU includes the 26 - tone RUs of the 5th and 14th, and the 242 - tone RUs of the 1st and 2nd. That is, the 26 - tone RUs of the 5th and 14th and the 242 - tone RUs of the 1st and 2nd correspond to resources not allocated to the receiving STA.

[0018] The first MRU includes the MRU in which the 26 - tone RU of the 5th and the 52 - tone RU of the 2nd are aggregated, the MRU in which the 26 - tone RU of the 14th and the 52 - tone RU of the 6th are aggregated, the MRU in which the 26 - tone RU of the 5th and the 106 - tone RU of the 1st are aggregated, the MRU in which the 26 - tone RU of the 5th and the 106 - tone RU of the 2nd are aggregated, the MRU in which the 26 - tone RU of the 14th and the 106 - tone RU of the 3rd are aggregated, and the MRU in which the 26 - tone RU of the 14th and the 106 - tone RU of the 4th are aggregated. That is, the multiple RUs included in the first MRU also correspond to resources not allocated to the receiving STA.

[0019] This embodiment proposes a method in which when the receiving STA operating only in the 20 - MHz band receives an OFDMA PPDU via the 40 - MHz band, the receiving STA is allocated only to the remaining resource units except the first RU and the first MRU.

Advantages of the Invention

[0020] According to the embodiment proposed in this specification, there is a new effect that performance degradation and interference with adjacent channels can be prevented by preventing data from being placed on tones corresponding to DC tones and guard tones in the 20 - MHz band where the receiving STA can operate. As a result, there is also an effect of increasing the overall throughput of STAs operating only at 20 MHz.

Brief Description of the Drawings

[0021]

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Embodiments for Carrying Out the Invention

[0022] In this specification, "A or B" can mean "only A", "only B", or "both A and B". Also, in this specification, "A or B" can be interpreted as "A and / or B". For example, in this specification, "A, B, or C" can mean "only A", "only B", "only C", or "any combination of A, B, and C".

[0023] The slashes ( / ) and commas used in this specification can mean "and / or". For example, "A / B" can mean "A 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".

[0024] In this specification, "at least one of A and B" can mean "only A", "only B", or "both A and B". Also, in this specification, expressions such as "at least one of A or B" and "at least one of A and / or B" can be interpreted in the same way as "at least one of A and B".

[0025] Also, in this specification, "at least one of A, B and C" can mean "only A", "only B", "only C", or "any combination of A, B and C". Also, "at least one of A, B or C" and "at least one of A, B and / or C" can mean "at least one of A, B and C".

[0026] Also, the parentheses used in this specification can mean "for example". Specifically, when displayed as "control information (PDCCH)", "PDCCH" is proposed as an example of "control information". Also, the "control information" in this specification is not limited to "PDCCH", and "PDDCH" is proposed as an example of "control information". Also, when displayed as "control information (i.e., PDCCH)", "PDCCH" is proposed as an example of "control information".

[0027] In this specification, the technical features individually described within one drawing can be embodied individually or simultaneously.

[0028] The following example in this specification is applicable to various wireless communication systems. For example, the following example in this specification is applicable to a wireless local area network (WLAN) system. For example, this specification is applicable to the IEEE 802.11a / g / n / ac standards and the IEEE 802.11ax standard. Also, this specification is applicable to the newly proposed EHT standard or the IEEE 802.11be standard. Also, an example in this specification is applicable to a new wireless LAN standard that enhances the EHT standard or the IEEE 802.11be. Also, an example in this specification is applicable to a mobile communication system. For example, it is applicable to a mobile communication system based on LTE (Long Term Evolution) based on the 3GPP (3rd Generation Partnership Project) (registered trademark) standard and its evolution. Also, an example in this specification is applicable to a communication system of the 5GNR standard based on the 3GPP standard.

[0029] Hereinafter, in order to describe the technical features of this specification, the technical features to which this specification is applicable will be described.

[0030] FIG. 1 shows an example of a transmission device and / or a reception device in this specification.

[0031] An example of FIG. 1 can perform various technical features described below. FIG. 1 is related to at least one STA (station). For example, the STA (110, 120) in this specification can be called 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) in this specification can be called 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) in this specification can be called by various names such as a receiving device, a transmitting device, a receiving STA, a transmitting STA, a receiving Device, a transmitting Device, etc.

[0032] For example, the STA (110, 120) can perform the role of an AP (Access Point) or a non-AP role. That is, the STA (110, 120) in this specification can perform the functions of an AP and / or a non-AP. In this specification, an AP can also be denoted as an AP STA.

[0033] The STA (110, 120) in this specification can support various communication standards other than the IEEE802.11 standard. For example, it can support communication standards related to 3GPP standards (such as LTE, LTE-A, 5GNR standards), etc. Also, the STA in this specification is implemented in various devices such as mobile phones, vehicles, personal computers, etc. Further, the STA in this specification can support communication for various communication services such as voice calls, video calls, data communication, self-driving (autonomous driving).

[0034] In this specification, the STA (110, 120) can include a medium access control (MAC) that complies with the provisions of the IEEE 802.11 standard and a physical layer interface for the wireless medium.

[0035] The STA (110, 120) will be described based on FIG. 1(a) as follows.

[0036] The first STA (110) includes a processor (111), a memory (112), and a transceiver (113). The shown processor, memory, and transceiver are implemented as separate chips respectively, or at least two or more blocks / functions are implemented via one chip.

[0037] The transceiver (113) of the first STA executes signal transmission and reception operations. Specifically, it can transmit and receive IEEE 802.11 packets (for example, IEEE 802.11a / b / g / n / ac / ax / be, etc.).

[0038] For example, the first STA (110) can execute the intended operations of an AP. For example, the processor (111) of the AP can receive signals via the transceiver (113), process the received signals, generate transmission signals, and execute control for signal transmission. The memory (112) of the AP can store the signals received via the transceiver (that is, the received signals), and can store the signals transmitted via the transceiver (that is, the transmission signals).

[0039] For example, the second STA (120) can execute the intended operations of a Non-AP STA. For example, the transceiver (123) of the non-AP executes signal transmission and reception operations. Specifically, it can transmit and receive IEEE 802.11 packets (for example, IEEE 802.11a / b / g / n / ac / ax / be, etc.).

[0040] For example, the processor (121) of the Non-AP STA can receive signals via the transceiver (123), process the received signals, generate transmission signals, and execute control for signal transmission. The memory (122) of the Non-AP STA can store the signals received via the transceiver (123) (i.e., the received signals), and can store the signals transmitted via the transceiver (i.e., the transmission signals).

[0041] For example, in the following specification, the operations of the device indicated as AP are executed in the first STA (110) or the second STA (120). For example, when the first STA (110) is the AP, the operations of the device indicated as AP are controlled by the processor (111) of the first STA (110), and related signals are transmitted or received via the transceiver (113) controlled by the processor (111) of the first STA (110). Also, the control information related to the operations of the AP and the transmission / reception signals of the AP are stored in the memory (112) of the first STA (110). Also, when the second STA (110) is the AP, the operations of the device indicated as AP are controlled by the processor (121) of the second STA (120), and related signals are transmitted or received via the transceiver (123) controlled by the processor (121) of the second STA (120). Also, the control information related to the operations of the AP and the transmission / reception signals of the AP are stored in the memory (122) of the second STA (110).

[0042] For example, in the following specification, the operations of the device indicated as non-AP (or User-STA) are executed in the first STA (110) or the second STA (120). For example, when the second STA (120) is non-AP, the operations of the device indicated as non-AP are controlled by the processor (121) of the second STA (120), and related signals are transmitted or received via the transceiver (123) controlled by the processor (121) of the second STA (120). Also, the control information related to the operations of non-AP and the transmission / reception signals of the AP are stored in the memory (122) of the second STA (120). For example, when the first STA (110) is non-AP, the operations of the device indicated as non-AP are controlled by the processor (111) of the first STA (110), and related signals are transmitted or received via the transceiver (113) controlled by the processor (111) of the first STA (120). Also, the control information related to the operations of non-AP and the transmission / reception signals of the AP are stored in the memory (112) of the first STA (110).

[0043] In the following specification, devices referred to 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. mean the STA (110, 120) in FIG. 1. For example, devices displayed 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 reference numerals also mean the STA (110, 120) in FIG. 1. For example, in one example below, the operation of various STAs transmitting and receiving signals (e.g., PPPDU) may be executed in the transceivers (113, 123) in FIG. 1. Also, in one example below, the operation of various STAs generating transmission and reception signals or performing data processing and operations in advance for transmission and reception signals may be executed in the processors (111, 121) in FIG. 1. For example, an example of the operation of generating transmission and reception signals or performing data processing and operations in advance for transmission and reception signals includes: 1) the operation of determining / acquiring / configuring / operating / decoding / encoding the bit information of the sub-field (SIG, STF, LTF, Data) fields included in the PPPDU; 2) the operation of determining / configuring / acquiring time resources and frequency resources (e.g., sub-carrier resources) used for the sub-field (SIG, STF, LTF, Data) fields included in the PPPDU; 3) the operation of determining / configuring / acquiring specific sequences (e.g., pilot sequence, STF / LTF sequence, extra sequence applied to SIG) used for the sub-field (SIG, STF, LTF, Data) fields included in the PPPDU; 4) the power control operation and / or power saving operation applied to the STA; 5) operations related to the determination / acquisition / configuring / operating / decoding / encoding of ACK signals, etc.Also, in the following example, various information (e.g., information related to fields / sub-fields / control fields / parameters / power, etc.) used by various STAs for signal determination / acquisition / configuration / operation / decoding / encoding is stored in the memories (112, 122) of FIG. 1.

[0044] The device / STA of FIG. 1(a) described above is modified as shown in FIG. 1(b). Based on the following FIG. 1(b), the STAs (110, 120) in this specification will be described.

[0045] For example, the transceivers (113, 123) shown in FIG. 1(b) can perform the same functions as the transceivers shown in FIG. 1(a) described above. For example, the processing chips (114, 124) shown in FIG. 1(b) can include processors (111, 121) and memories (112, 122). The processors (111, 121) and memories (112, 122) shown in FIG. 1(b) can perform the same functions as the processors (111, 121) and memories (112, 122) shown in FIG. 1(a) described above.

[0046] 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 mean the STAs (110, 120) shown in FIGS. 1(a) / (b), or the processing chips (114, 124) shown in FIG. 1(b). That is, the technical features of this specification can be executed on the STAs (110, 120) shown in FIGS. 1(a) / (b), or may be executed only on the processing chips (114, 124) shown in FIG. 1(b). For example, the technical feature that the transmitting STA transmits a control signal can be understood as the technical feature that the control signal generated in the processors (111, 121) shown in FIGS. 1(a) / (b) is transmitted via the transceivers (113, 123) shown in FIGS. 1(a) / (b). Or, the technical feature that the transmitting STA transmits a control signal can be understood as the technical feature that the control signal transmitted to the transceivers (113, 123) is generated in the processing chips (114, 124) shown in FIG. 1(b).

[0047] For example, the technical feature that the receiving STA receives a control signal can be understood as the technical feature that the control signal is received by the transceivers (113, 123) shown in FIG. 1(a). Or, the technical feature that the receiving STA receives a control signal can be understood as the technical feature that the control signal received by the transceivers (113, 123) shown in FIG. 1(a) is acquired by the processors (111, 121) shown in FIG. 1(a). Or, the technical feature that the receiving STA receives a control signal can be understood as the technical feature that the control signal received by the transceivers (113, 123) shown in FIG. 1(b) is acquired by the processing chips (114, 124) shown in FIG. 1(b).

[0048] Referring to FIG. 1(b), software codes (115, 125) are included in the memories (112, 122). The software codes (115, 125) include instructions for controlling the operation of the processors (111, 121). The software codes (115, 125) are included in various programming languages.

[0049] The processors (111, 121) or processing chips (114, 124) shown in FIG. 1 can include an ASIC (application-specific integrated circuit), other chip sets, logic circuits, and / or data processing devices. The processor is an AP (application processor). For example, the processors (111, 121) or processing chips (114, 124) shown in FIG. 1 can include at least one of a DSP (digital signal processor), a CPU (central processing unit), a GPU (graphics processing unit), and a modem (modulator and demodulator). For example, the processors (111, 121) or processing chips (114, 124) shown in FIG. 1 can be a SNAPDRAGON manufactured by Qualcomm (registered trademark) TMSeries processors, EXYNOS manufactured by Samsung (registered trademark) TM Series processors, A series processors manufactured by Apple (registered trademark), HELIO manufactured by MediaTek (registered trademark) TM Series processors, ATOM manufactured by INTEL (registered trademark) TM It is a series processor or a processor that enhances this.

[0050] In this specification, the uplink means a link for communication from a non-AP STA to an AP STA, and an uplink PPDU / packet / signal, etc. is transmitted via the uplink. Also, in this specification, the downlink means a link for communication from an AP STA to a non-AP STA, and a downlink PPDU / packet / signal, etc. is transmitted via the downlink.

[0051] Figure 2 is a conceptual diagram showing the structure of a wireless LAN (WLAN).

[0052] The upper part of Figure 2 shows the structure of the IEEE (Institute of Electrical and Electronic Engineers) 802.11 infrastructure BSS (Basic Service Set).

[0053] Referring to the upper part of Figure 2, the wireless LAN system can include one or more infrastructure BSSs (200, 205) (hereinafter, BSS). BSS (200, 205) is not a concept referring to a specific area as a set of an AP (Access Point, 225) and an STA such as STA1 (Station, 200-1) that can communicate with each other by synchronizing normally. BSS (205) can include one or more connectable STAs (205-1, 205-2) to one AP (230).

[0054] A BSS can include at least one STA, an AP (225, 230) that provides a distribution service, and a distribution system (DS, 210) that connects multiple APs.

[0055] The distribution system (210) can connect multiple BSSs (200, 205) to implement an extended service set (ESS, 240). The ESS (240) is used as a term to indicate a single network formed by connecting one or more APs via the distribution system (210). The APs included in a single ESS (240) have the same SSID (service set identification).

[0056] The portal (220) can perform the role of a bridge to execute the connection between a wireless LAN network (IEEE802.11) and other networks (e.g., 802.X).

[0057] In a BSS like the upper part of Figure 2, the network between the APs (225, 230) and the network between the APs (225, 230) and the STAs (200-1, 205-1, 205-2) are implemented. However, it is also possible to set up a network and communicate directly between STAs without the APs (225, 230). A network that sets up a network and communicates directly between STAs without the APs (225, 230) is defined as an ad-hoc network or an independent basic service set (IBSS).

[0058] The lower part of Figure 2 is a conceptual diagram showing an IBSS.

[0059] Referring to the lower part of FIG. 2, an IBSS is a BSS operating in ad hoc mode. Since an IBSS does not include an AP, there is no centralized management entity that executes management functions in the center. That is, in an IBSS, STAs (250-1, 250-2, 250-3, 255-4, 255-5) are managed in a distributed manner. In an IBSS, all STAs (250-1, 250-2, 250-3, 255-4, 255-5) are composed of mobile STAs, and connections to the distribution system are not permitted, constituting a self-contained network.

[0060] FIG. 3 is a drawing for explaining a normal link setup process.

[0061] In the shown step S310, the STA can perform an operation of finding a network. The operation of finding a network can include the scanning operation of the STA. That is, in order for the STA to access the network, it is necessary to find a network that can be participated in. The STA needs to identify a compatible network before participating in the wireless network, and the process of identifying the network existing in a specific area is called scanning. There are active scanning and passive scanning as scanning methods.

[0062] FIG. 3 exemplarily shows an operation of finding a network including an active scanning process. In active scanning, a STA that performs scanning sends a probe request frame to move channels and search for which APs exist in the vicinity, and waits for a response thereto. A responder sends a probe response frame as a response to the probe request frame to the STA that sent the probe request frame. Here, the responder is the STA that last sent a beacon frame in the BSS of the channel being scanned. In a BSS, since the AP sends a beacon frame, the AP becomes the responder, and in an IBSS, since a STA within the IBSS sends back a beacon frame, the responder is not constant. For example, a STA that sends a probe request frame on channel 1 and receives a probe response frame on channel 1 stores the BSS-related information included in the received probe response frame, moves to the next channel (e.g., channel 2), and can perform scanning in the same way (i.e., send and receive probe requests / responses on channel 2).

[0063] Although not shown as an example in FIG. 3, the scanning operation may be performed by the passive scanning method. A STA that performs scanning based on passive scanning can wait for a beacon frame while moving channels. A beacon frame is one of the management frames in IEEE 802.11, which notifies the existence of a wireless network, periodically transmits to find a wireless network for a STA that performs scanning, and enables the STA to participate in the wireless network. In a BSS, an AP performs the role of periodically transmitting a beacon frame, and in an IBSS, a STA within the IBSS transmits the beacon frame back. A STA that performs scanning stores the information about the BSS included in the beacon frame if it receives the beacon frame, and records the beacon frame information on each channel while moving to other channels. A STA that has received a beacon frame stores the BSS-related information included in the received beacon frame and can move to the next channel and perform scanning on the next channel in the same way.

[0064] A STA that has discovered a network can execute an authentication process via step S320. Such an authentication process is referred to as a first authentication process in order to clearly distinguish it from the security setting operation in step S340 described later. The authentication process in S320 can include a process in which a STA transmits an authentication request frame to an AP and, in response, the AP transmits an authentication response frame to the STA. The authentication frame used for authentication request / response corresponds to a management frame.

[0065] The authentication frame can include information about the authentication algorithm number, authentication transaction sequence number, status code, challenge text, RSN (Robust Security Network), Finite Cyclic Group, etc.

[0066] The STA can send an authentication request frame to the AP. Based on the information contained in the received authentication request frame, the AP can determine whether to permit the authentication for the corresponding STA. The AP can provide the result of the authentication process to the STA via an authentication response frame.

[0067] The normally authenticated STA can execute the connection process based on step S330. The connection process includes the process in which the STA transmits an association request frame to the AP, and in response, the AP transmits an association response frame to the STA. For example, the association request frame can include information related to various capabilities, the beacon listen interval, the SSID (service set identifier), the supported rates, the supported channels, the RSN, the mobility domain, the supported operating classes, the Traffic Indication Map Broadcast request, information on interworking service capabilities, and the like. For example, the association response frame can include information related to various capabilities, the status code, the AID (Association ID), the supported rate, the EDCA (Enhanced Distributed Channel Access) parameter set, the RCPI (Received Channel Power Indicator), the RSNI (Received Signal to Noise Indicator), the mobility domain, the timeout interval (association comeback time), the overlapping BSS scan parameters, the TIM broadcast response, the QoS map, and the like.

[0068] Thereafter, in step S340, the STA can execute the security setting process. The security setting process in step S340 can include, for example, the process of setting up a private key via a 4-way handshake via an EAPOL (Extesible Authntication Protocol over LAN) frame.

[0069] FIG. 4 is a drawing showing an example of a PPDU used in the IEEE standard.

[0070] As shown, various forms of PPDU (PHY protocol data unit) are used in standards such as IEEE a / g / n / ac. Specifically, the LTF and STF fields contain training signals, the SIG-A and SIG-B contain control information for the receiving station, and the data field contains user data corresponding to the PSDU (MAC PDU / Aggregated MAC PDU).

[0071] Also, FIG. 4 includes an example of the HE PPDU of the IEEE 802.11ax standard. The HE PPDU according to FIG. 4 is an example of a PPDU for multiple users. The HE-SIG-B is included only in the case of multiple users, and the corresponding HE-SIG-B is omitted from the PPDU for a single user.

[0072] As shown, the HE-PPDU for multiple users (Multiple User; MU) can include an L-STF (legacy-short training field), an L-LTF (legacy-long training field), an L-SIG (legacy-signal), an HE-SIG-A (high efficiency-signal A), an HE-SIG-B (high efficiency-signal-B), an HE-STF (high efficiency-short training field), an HE-LTF (high efficiency-long training field), a data field (or MAC payload), and a PE (Packet Extension) field. Each field is transmitted during the indicated time interval (i.e., 4 or 8 μs, etc.).

[0073] The resource unit (RU) used in the PPDU is described as follows. The resource unit can include a plurality of subcarriers (or tones). The resource unit is used when transmitting signals to a number of STAs based on the OFDMA technology. Also, a resource unit is defined even when transmitting a signal to one STA. The resource unit is used for the STF, LTF, data field, etc.

[0074] FIG. 5 is a drawing showing the arrangement of resource units (RUs) used on a 20 MHz band.

[0075] As shown in FIG. 5, resource units (RUs) corresponding to different numbers of tones (i.e., subcarriers) can be used to constitute some fields of the HE-PPDU. For example, resources are allocated in RU units shown for the HE-STF, HE-LTF, and data fields.

[0076] As shown at the top of FIG. 5, 26 units (i.e., units corresponding to 26 tones) are arranged. Six tones are used for the guard band in the leftmost band of the 20 MHz band, and five tones are used for the guard band in the rightmost band of the 20 MHz band. Also, seven DC tones are inserted into the center band, i.e., the DC band, and there may be 26-units corresponding to 13 tones on each side of the DC band. Also, 26 units, 52 units, and 106 units are allocated to other bands. Each unit is allocated for the receiving station, i.e., the user.

[0077] On the other hand, the RU arrangement in FIG. 5 is utilized not only for the situation of a number of users (MUs) but also for the situation of a single user (SU). In this case, it is possible to use one 242-unit as shown at the bottom of FIG. 5, and in this case, three DC tones are inserted.

[0078] In an example of FIG. 5, various sizes of RUs, i.e., 26RU, 52RU, 106RU, 242RU, etc., were proposed. Since the specific sizes of such RUs may be extended or increased, this embodiment is not limited to the specific sizes of each RU (i.e., the corresponding number of tones).

[0079] FIG. 6 is a drawing showing the arrangement of resource units (RUs) used in the 40 MHz band.

[0080] Similar to the use of various sizes of RUs in an example of FIG. 5, in an example of FIG. 6, 26RU, 52RU, 106RU, 242RU, 484RU, etc. are also used. Also, 5 DC tones are inserted at the center frequency, 12 tones are used for the guard band in the leftmost band of the 40 MHz band, and 11 tones are used for the guard band in the rightmost band of the 40 MHz band.

[0081] Also, as shown, when used for a single user, 484RU can be used. On the other hand, the fact that the specific number of RUs can be changed is the same as in an example of FIG. 4.

[0082] FIG. 7 is a drawing showing the arrangement of resource units (RUs) used in the 80 MHz band.

[0083] Similar to the use of various sizes of RUs in an example of FIGS. 5 and 6, in an example of FIG. 7, 26RU, 52RU, 106RU, 242RU, 484RU, 996RU, etc. can also be used. Also, 7 DC tones are inserted at the center frequency, 12 tones are used for the guard band in the leftmost band of the 80 MHz band, and 11 tones are used for the guard band in the rightmost band of the 80 MHz band. Also, 26RU using 13 tones located on each side of the DC band can be used.

[0084] Also, as shown, when used for a single user, 996RU can be used, and in this case, 5 DC tones are inserted.

[0085] The RUs described in this specification are used for UL (Uplink) communication and DL (Downlink) communication. For example, when UL-MU communication solicited by a Trigger frame is performed, the transmitting STA (e.g., AP) can allocate a first RU (e.g., 26 / 52 / 106 / 242RU, etc.) to the first STA and a second RU (e.g., 26 / 52 / 106 / 242RU, etc.) to the second STA via the Trigger frame. Subsequently, the first STA can transmit a first Trigger-Based PPDU based on the first RU, and the second STA can transmit a second Trigger-Based PPDU based on the second RU. The first / second Trigger-Based PPDUs are transmitted to the AP within the same time interval.

[0086] For example, when a DL MU PPDU is configured, the transmitting STA (e.g., AP) can allocate a first RU (e.g., 26 / 52 / 106 / 242RU, etc.) to the first STA and a second RU (e.g., 26 / 52 / 106 / 242RU, etc.) to the second STA. That is, the transmitting STA (e.g., AP) can transmit the HE-STF, HE-LTF, and Data fields for the first STA via the first RU and the HE-STF, HE-LTF, and Data fields for the second STA via the second RU within one MU PPDU.

[0087] Information regarding the RU allocation is signaled via HE-SIG-B.

[0088] FIG. 8 shows the structure of the HE-SIG-B field.

[0089] As shown, the HE-SIG-B field (810) includes a common field (820) and a user-specific field (830). The common field (820) can include information that is commonly applicable to all users who receive SIG-B (i.e., user STAs). The user-specific field (830) can be called a user-specific control field. The user-specific field (830) can only be applied to some of the multiple users when SIG-B is transmitted to multiple users.

[0090] As shown in FIG. 8, the common field (820) and the user-specific field (830) can be encoded separately.

[0091] The common field (820) can include N*8-bit RU allocation information. For example, the RU allocation information can include information regarding the location of the RUs. For example, when a 20 MHz channel is used as shown in FIG. 5, the RU allocation information can include information regarding which RUs (26 RUs / 52 RUs / 106 RUs) are arranged in which frequency bands.

[0092] An example when the RU allocation information is composed of 8 bits is as follows.

[0093] [Table 1]

[0094] As in the example of FIG. 5, up to nine 26RUs are allocated to a 20 MHz channel. When the RU allocation information in the common field (820) is set to, for example, "00000000" as in Table 1, nine 26RUs are allocated to the corresponding channel (i.e., 20 MHz). Also, when the RU allocation information in the common field (820) is set to "00000001" as in Table 1, seven 26RUs and one 52RU are arranged in the corresponding channel. That is, in the example of FIG. 5, a 52RU is allocated on the far right, and seven 26RUs are allocated to its left.

[0095] An example of Table 1 shows only a part of the RU locations where the RU allocation information can be displayed.

[0096] For example, the RU allocation information can further include an example of Table 2 below.

[0097]

Table 2

[0098] "01000y2y1y0" is related to an example where 106RUs are allocated to the left end of a 20 MHz channel, and five 26RUs are allocated to its right. In this case, a number of STAs (e.g., User-STAs) are allocated to the 106RUs based on the MU-MIMO technology. Specifically, up to eight STAs (e.g., User-STAs) are allocated to the 106RUs, and the number of STAs (e.g., User-STAs) allocated to the 106RUs is determined based on 3-bit information (y2y1y0). For example, when the 3-bit information (y2y1y0) is set to N, the number of STAs (e.g., User-STAs) allocated to the 106RUs based on the MU-MIMO technology is N + 1.

[0099] Normally, a plurality of different STAs (e.g., User STAs) are assigned to a plurality of RUs. However, for one RU with a specific size (e.g., 106 subcarriers) or more, a plurality of STAs (e.g., User STAs) are assigned based on the MU-MIMO technology.

[0100] As shown in FIG. 8, the user individual field (830) can include a plurality of user fields. As described above, the number of STAs (e.g., User STAs) assigned to a specific channel is determined based on the RU allocation information in the common field (820). For example, when the RU allocation information in the common field (820) is "00000000", one User STA is assigned to each of the 9 26-RUs (i.e., a total of 9 User STAs are assigned). That is, a maximum of 9 User STAs are assigned to a specific channel via the OFDMA technology. Also, a maximum of 9 User STAs are assigned to a specific channel via the non-MU-MIMO technology.

[0101] For example, when the RU allocation is set to "01000y2y1y0", a plurality of User STAs are assigned to the 106-RU arranged at the left end via the MU-MIMO technology, and 5 User STAs are assigned to the 5 26-RUs arranged on the right side thereof via the non-MU-MIMO technology. Such a case is embodied through an example in FIG. 9.

[0102] FIG. 9 shows an example in which a plurality of User STAs are assigned to the same RU via the MU-MIMO technology.

[0103] For example, when the RU allocation is set to "01000010" as shown in FIG. 9, based on Table 2, 106 RUs are allocated to the left end of a specific channel, and five 26 RUs are allocated to the right side thereof. In addition, a total of three User STAs are allocated to the 106 RUs via the MU-MIMO technology. As a result, since a total of eight User STAs are allocated, the user individual field (830) of HE-SIG-B can include eight User fields.

[0104] The eight User fields are included in the order shown in FIG. 9. Also, as shown in FIG. 8, two User fields are implemented in one User block field.

[0105] The User fields shown in FIGS. 8 and 9 are configured based on two formats. That is, the User fields related to the MU-MIMO technology are configured in the first format, and the User fields related to the non-MU-MIMO technology are configured in the second format. Referring to an example in FIG. 9, User field 1 to User field 3 are based on the first format, and User field 4 to User field 8 are based on the second format. The first format or the second format can include bit information of the same length (for example, 21 bits).

[0106] Each User field can have the same size (for example, 21 bits). For example, the User field in the first format (the format of the MU-MIMO technology) is configured as follows.

[0107] For example, the first bit (e.g., B0 - B10) within the User field (i.e., 21 bits) can include identification information (e.g., STA-ID, partial AID, etc.) of the User STA to which the User field is assigned. Also, the second bit (e.g., B11 - B14) within the User field (i.e., 21 bits) can include information regarding the spatial configuration.

[0108] Furthermore, the third bit (i.e., B15 - 18) within the User field (i.e., 21 bits) can include MCS (Modulation and coding scheme) information. The MCS information can be applied to the data field within the PPDU in which the SIG-B is included.

[0109] The MCS, MCS information, MCS index, MCS field, etc. used in this specification can be represented by specific index values. For example, the MCS information can be denoted from index 0 to index 11. The MCS information can include information regarding the constellation modulation type (e.g., BPSK, QPSK, 16-QAM, 64-QAM, 256-QAM, 1024-QAM, etc.) and information regarding the coding rate (e.g., 1 / 2, 2 / 3, 3 / 4, 5 / 6, etc.). Information regarding the channel coding type (e.g., BCC or LDPC) can be excluded from the MCS information.

[0110] Also, the fourth bit (i.e., B19) within the User field (i.e., 21 bits) can be a Reserved field.

[0111] Also, the 5th bit (i.e., B20) within the User field (i.e., 21 bits) can contain information regarding the coding type (e.g., BCC or LDPC). That is, the 5th bit (i.e., B20) can contain information regarding the type of channel coding (e.g., BCC or LDPC) applied to the data field within the PPDU in which the SIG-B is included.

[0112] The above example is related to the User field of the first format (the format of MU-MIMO technology). An example of the User field of the second format (the format of non-MU-MIMO technology) is as follows.

[0113] The 1st bit (e.g., B0 - B10) within the User field of the second format can contain the identification information of the User STA. Also, the 2nd bit (e.g., B11 - B13) within the User field of the second format can contain information regarding the number of spatial streams applied to the RU. Also, the 3rd bit (e.g., B14) within the User field of the second format contains information regarding whether the beam forming steering matrix is applied. The 4th bit (e.g., B15 - B18) within the User field of the second format can contain MCS (Modulation and coding scheme) information. Also, the 5th bit (e.g., B19) within the User field of the second format can contain information regarding whether DCM (Dual Carrier Modulation) is applied. Also, the 6th bit (i.e., B20) within the User field of the second format can contain information regarding the coding type (e.g., BCC or LDPC).

[0114] As follows, the PPDU transmitted / received by the STA in this specification is described.

[0115] FIG. 10 shows an example of the PPDU used in this specification.

[0116] The PPDU in FIG. 10 is called by various names such as an EHT PPDU, a transmission PPDU, a reception PPDU, a first type or an Nth type PPDU. For example, in this specification, the PPDU or the EHT PPDU is called by various names such as a transmission PPDU, a reception PPDU, a first type or an Nth type PPDU. Also, the EHT PPU is used in an EHT system and / or a new wireless LAN system that improves the EHT system.

[0117] The PPDU in FIG. 10 can indicate some or all of the PPDU types used in the EHT system. For example, an example in FIG. 10 can be used for both the SU (single-user) mode and the MU (multi-user) mode. In other words, the PPDU in FIG. 10 can be a PPDU for one receiving STA or multiple receiving STAs. When the PPDU in FIG. 10 is used for the TB (Trigger-based) mode, the EHT-SIG in FIG. 10 can be omitted. In other words, an STA that has received a Trigger frame for UL-MU (Uplink-MU) communication can transmit a PPDU in which the EHT-SIG is omitted in an example in FIG. 10.

[0118] In FIG. 10, from the L-STF to the EHT-LTF can be called a preamble or a physical preamble, and is generated / transmitted / received / acquired / decoded in the physical layer.

[0119] The subcarrier spacing of the L-STF, L-LTF, L-SIG, RL-SIG, U-SIG, and EHT-SIG fields in Figure 10 is set to 312.5 kHz, and the subcarrier spacing of the EHT-STF, EHT-LTF, and Data fields is 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 EHT-SIG fields is displayed in units of 312.5 kHz, and the tone index (or subcarrier index) of the EHT-STF, EHT-LTF, and Data fields can be displayed in units of 78.125 kHz.

[0120] The L-LTF and L-STF in the PPDU of Figure 10 can be the same as the conventional fields.

[0121] The L-SIG field in Figure 10 can contain, for example, 24-bit bit information. For example, the 24-bit information can 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 can contain information regarding the length or time duration of the PPDU. For example, the value of the 12-bit Length field is determined based on the type of the PPDU. For example, when the PPDU is a non-HT, HT, VHT PPDU or an EHT PPDU, the value of the Length field is determined as a multiple of 3. For example, when the PPDU is a HE PPDU, the value of the Length field is determined as "a multiple of +1" or "a multiple of +2". In other words, the value of the Length field can be determined as a multiple of 3 for non-HT, HT, VHT PPDUs or EHT PPDUs, and the value of the Length field is determined as "a multiple of 3 + 1" or "a multiple of +2" for HE PPDUs.

[0122] For example, the transmitting STA can apply coding, which is BCC based on a code rate of 1 / 2 for the 24-bit information in the L-SIG field. Subsequently, the transmitting STA can obtain 48-bit BCC-coded bits. BPSK modulation is applied to the 48-bit coded bits to generate 48 BPSK symbols. The transmitting STA can map the 48 BPSK symbols to positions excluding the pilot subcarriers {subcarrier indices -21, -7, +7, +21} and the DC subcarrier {subcarrier index 0}. As a result, the 48 BPSK symbols are mapped to subcarrier indices from -26 to -22, -20 to -8, -6 to -1, +1 to +6, +8 to +20, and +22 to +26. The transmitting STA can further map signals of {-1, -1, -1, 1} to subcarrier indices {-28, -27, +27, 28}. The above signals are used for channel estimation for the frequency region corresponding to {-28, -27, +27, 28}.

[0123] The transmitting STA can generate an RL-SIG that is generated in the same way as the L-SIG. BPSK modulation is applied to the RL-SIG. The receiving STA can determine that the received PPDU is a HE PPDU or an EHT PPDU based on the presence of the RL-SIG.

[0124] After the RL-SIG in FIG. 10, a U-SIG (Universal SIG) can be inserted. The U-SIG can 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, etc.

[0125] The U-SIG can contain N-bit information and can also contain information for identifying the type of the EHT PPDU. For example, the U-SIG is composed based on two symbols (for example, two consecutive OFDM symbols). Each symbol (for example, OFDM symbol) for the U-SIG can have a duration of 4 us. Each symbol of the U-SIG is used to transmit 26-bit information. For example, each symbol of the U-SIG is transmitted and received based on 52 data tones and 4 pilot tones.

[0126] For example, via the U-SIG (or U-SIG field), A-bit information (for example, 52 un-coded bits) is transmitted. The first symbol of the U-SIG can transmit the first X-bit information (for example, 26 un-coded bits) among the total A-bit information, and the second symbol of the U-SIG can transmit the remaining Y-bit information (for example, 26 un-coded bits) among the total A-bit information. For example, the transmitting STA can obtain the 26 un-coded bits included in each U-SIG symbol. The transmitting STA can perform convolutional encoding (that is, coding which is BCC) based on a rate of R = 1 / 2 to generate 52-coded bits and can 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 assigned to each U-SIG symbol. One U-SIG symbol is transmitted based on 56 tones (sub-carriers) from sub-carrier index -28 to sub-carrier index +28 except for the DC index 0. The 52 BPSK symbols generated by the transmitting STA are transmitted based on the remaining tones (sub-carriers) excluding the pilot tones -21, -7, +7, +21 tones.

[0127] For example, the A-bit information (e.g., 52 un-coded bits) transmitted by U-SIG can include a CRC field (e.g., a field with a length of 4 bits) and a tail field (e.g., a field with a length of 6 bits). The CRC field and the tail field are transmitted via the second symbol of U-SIG. The CRC field is generated based on the 26 bits assigned to the first symbol of U-SIG and the remaining 16 bits excluding the CRC / tail field within the second symbol, and is generated based on a conventional CRC calculation algorithm. Also, the tail field is used to terminate the trellis of the convolutional decoder and is set, for example, with "".

[0128] The A-bit information (e.g., 52 un-coded bits) transmitted by U-SIG (or the 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 are assigned only to the first symbol of U-SIG, or the version-independent bits are assigned to all of the first symbol and the second symbol of U-SIG. For example, the version-independent bits and the version-dependent bits are called by various names such as the first control bit and the second control bit.

[0129] For example, the version-independent bits of U-SIG can include a 3-bit PHY version identifier. For example, the 3-bit PHY version identifier can include information related to the PHY version of the transmitted and received PPDU. For example, the first value of the 3-bit PHY version identifier can indicate that the transmitted and received PPDU is an EHT PPDU. In other words, when the transmitting STA transmits an EHT PPDU, it can set the 3-bit PHY version identifier as the first value. In other words, the receiving STA can determine that the received PPDU is an EHT PPDU based on the PHY version identifier with the first value.

[0130] For example, the version-independent bits of U-SIG can include a 1-bit UL / DL flag field. The first value of the 1-bit UL / DL flag field is related to UL communication, and the second value of the UL / DL flag field is related to DL communication.

[0131] For example, the version-independent bits of U-SIG can include information regarding the length of the TXOP and information regarding the BSS color ID.

[0132] For example, when EHT PPDUs are divided into various types (such as various types related to SU mode EHT PPDUs, MU mode EHT PPDUs, TB mode EHT PPDUs, Extended Range transmission related EHT PPDUs, etc.), information regarding the type of EHT PPDU is included in the version-dependent bits of U-SIG.

[0133] For example, the U-SIG may include: 1) a bandwidth field containing information about the bandwidth; 2) a field containing information about the MCS technology applied to the EHT-SIG; 3) an indication field containing information related to whether the dual subcarrier modulation (DCM) technology is applied to the EHT-SIG; 4) a field containing information about the number of symbols used for the EHT-SIG; 5) a field containing information related to whether the EHT-SIG is generated across the entire bandwidth; 6) a field containing information about the type of EHT-LTF / STF; and 7) information about a field indicating the length of the EHT-LTF and the length of the CP.

[0134] Preamble puncturing is applied to the PPDU in FIG. 10. Preamble puncturing means applying puncturing to a part of the entire bandwidth of the PPDU (for example, the Secondary 20 MHz bandwidth). For example, when an 80 MHz PPDU is transmitted, the STA can apply puncturing to the Secondary 20 MHz bandwidth within the 80 MHz bandwidth and transmit the PPDU only via the primary 20 MHz bandwidth and the secondary 40 MHz bandwidth.

[0135] For example, the pattern of preamble puncturing is set in advance. For example, when the first puncturing pattern is applied, puncturing is applied only to the Secondary 20 MHz band within the 80 MHz band. For example, when the second puncturing pattern is applied, puncturing is applied only to any 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 is 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, puncturing is applied to at least one 20 MHz channel that exists in the primary 40 MHz band included in the primary 80 MHz band within the 160 MHz band (or 80 + 80 MHz band) and does not belong to the primary 40 MHz band.

[0136] The information regarding the preamble puncturing applied to the PPDU is included in the U-SIG and / or EHT-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 the preamble puncturing applied to the PPDU.

[0137] For example, U-SIG and EHT-SIG can include information regarding preamble puncturing based on the following method. When the bandwidth of the PPDU exceeds 80 MHz, the U-SIG is individually configured in 80 MHz units. For example, when the bandwidth of the PPDU is 160 MHz, the PPDU includes 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 includes information regarding the 160 MHz bandwidth, and the second field of the first U-SIG can include information regarding the preamble puncturing applied to the first 80 MHz band (i.e., information regarding the preamble puncturing pattern). Also, the first field of the second U-SIG includes information regarding the 160 MHz bandwidth, and the second field of the second U-SIG can include information regarding the preamble puncturing applied to the second 80 MHz band (i.e., information regarding the preamble puncturing pattern). On the other hand, the EHT-SIG consecutive to the first U-SIG can include information regarding the preamble puncturing applied to the second 80 MHz band (i.e., information regarding the preamble puncturing pattern), and the EHT-SIG consecutive to the second U-SIG can include information regarding the preamble puncturing applied to the first 80 MHz band (i.e., information regarding the preamble puncturing pattern).

[0138] Furthermore or alternatively, U-SIG and EHT-SIG can include information regarding preamble puncturing based on the following method. The U-SIG can include information regarding preamble puncturing for all bands (i.e., information regarding the preamble puncturing pattern). That is, the EHT-SIG does not include information regarding preamble puncturing, and only the U-SIG can include information regarding preamble puncturing (i.e., information regarding the preamble puncturing pattern).

[0139] The U-SIG is composed in units of 20 MHz. For example, when an 80 MHz PPDU is composed, the U-SIG is replicated. That is, the same 4 U-SIGs are included in the 80 MHz PPDU. PPDUs exceeding 80 MHz bandwidth can include different U-SIGs from each other.

[0140] The EHT-SIG in FIG. 10 can include control information for the receiving STA. The EHT-SIG is transmitted via at least one symbol, and one symbol can have a length of 4 us. Information regarding the number of symbols used for the EHT-SIG is included in the U-SIG.

[0141] The EHT-SIG can include the technical features of the HE-SIG-B described via FIGS. 8 to 9. For example, the EHT-SIG can include a common field and a user-specific field, similar to an example in FIG. 8. The common field of the EHT-SIG can be omitted, and the number of user-specific fields is determined based on the number of users.

[0142] Similar to an example in FIG. 8, the common field of the EHT-SIG and the user-specific field of the EHT-SIG are coded separately. One user block field included in the user-specific field can include information for two users, but the last user block field included in the user-specific field can include information for one user. That is, one user block field of the EHT-SIG can include a maximum of two user fields. Similar to an example in FIG. 9, each user field is related to MU-MIMO allocation or non-MU-MIMO allocation.

[0143] Similar to an example in FIG. 8, the common field of the EHT-SIG can include CRC bits and Tail bits. The length of the CRC bits can be determined to be 4 bits, and the length of the Tail bits is determined to be 6 bits and set as "000000".

[0144] Similar to an example in FIG. 8, the common field of the EHT-SIG can include RU allocation information. RU allocation information means information regarding the location of RUs assigned to a plurality of users (i.e., a plurality of receiving STAs). Similar to Table 1, the RU allocation information is composed of 8-bit (or N-bit) units.

[0145] A mode of omitting the common field of the EHT-SIG is supported. The mode of omitting the common field of the EHT-SIG can be called the compressed mode. When the compressed mode is used, a plurality of users of the EHT PPDU (i.e., a plurality of receiving STAs) can decode the PPDU (e.g., the data field of the PPDU) based on non-OFDMA. That is, a plurality of users of the EHT PPDU can decode the PPDU (e.g., the data field of the PPDU) received via the same frequency band. On the other hand, when the non-compressed mode is used, a plurality of users of the EHT PPDU can decode the PPDU (e.g., the data field of the PPDU) based on OFDMA. That is, a plurality of users of the EHT PPDU can receive the PPDU (e.g., the data field of the PPDU) via different frequency bands.

[0146] The EHT-SIG is configured based on various MCS techniques. As described above, the information related to the MCS techniques applied to the EHT-SIG is included in the U-SIG. The EHT-SIG is configured based on the DCM technique. For example, among the N data tones (e.g., 52 data tones) assigned for the EHT-SIG, the first modulation technique is applied to the consecutive first half of the tones, and the second modulation technique is applied to the remaining consecutive second half of the tones. That is, the transmitting STA can modulate specific control information based on the first modulation technique into the first symbol and assign it to the consecutive first half of the tones, and modulate the same control information based on the second modulation technique into the second symbol and assign it to the remaining consecutive second half of the tones. As described above, the information (e.g., 1-bit field) related to whether the DCM technique is applied to the EHT-SIG is included in the U-SIG. The EHT-STF in FIG. 10 is used to improve automatic gain control estimation in a MIMO (multiple input multiple output) environment or an OFDMA environment. The EHT-LTF in FIG. 10 is used to estimate the channel in a MIMO environment or an OFDMA environment.

[0147] The information regarding the type of STF and / or LTF (including the information regarding the GI applied to the LTF) is included in the SIGA field and / or SIGB field in FIG. 10, etc.

[0148] The PPDU in FIG. 10 (i.e., the EHT-PPDU) is configured based on an example in FIGS. 5 and 6.

[0149] For example, the EHT PPDU transmitted on a 20 MHz band, i.e., the 20 MHz EHT PPDU, is configured based on the RU in FIG. 5. That is, the locations of the EHT-STF, EHT-LTF, and data field RUs included in the EHT PPDU are determined as shown in FIG. 5.

[0150] The EHT PPDU transmitted in the 40 MHz band, i.e., the 40 MHz EHT PPDU, is configured based on the RU in FIG. 6. That is, the locations of the RUs of the EHT-STF, EHT-LTF, and data field included in the EHT PPDU are determined as shown in FIG. 6.

[0151] Since the RU position in FIG. 6 corresponds to 40 MHz, repeating the pattern in FIG. 6 twice determines the tone-plan for 80 MHz. That is, the 80 MHz EHT PPDU is transmitted based on a new tone-plan in which the RUs in FIG. 6 (not the RUs in FIG. 7) are repeated twice.

[0152] When the pattern in FIG. 6 is repeated twice, 23 tones (i.e., 11 guard tones + 12 guard tones) are configured in the DC region. That is, the tone-plan for the 80 MHz EHT PPDU allocated based on OFDMA can have 23 DC tones. In contrast, the 80 MHz EHT PPDU allocated based on Non-OFDMA (i.e., non-OFDMA fullBand width 80 MHz PPDU) is configured based on 996 RUs and can include 5 DC tones, 12 left guard tones, and 11 right guard tones.

[0153] The tone-plan for 160 / 240 / 320 MHz is configured by repeating the pattern in FIG. 6 several times.

[0154] The PPDU in FIG. 10 is identified as an EHT PPDU based on the following method.

[0155] The receiving STA can determine that the type of the received PPDU is an EHT PPDU based on the following items. For example, 1) the first symbol after the L-LTF signal of the received PPDU is BPSK, 2) an RL-SIG in which the L-SIG of the received PPDU is repeated is detected, 3) when the result of applying "modulo 3" to the value of the Length field of the L-SIG of the received PPDU is detected as "0", the received PPDU is determined as an EHT PPDU. When the received PPDU is determined as an EHT PPDU, the receiving STA can detect the type of the EHT PPDU (for example, SU / MU / Trigger-based / Extended Range type) based on the bit information included in the symbols after the RL-SIG in FIG. 10. In other words, the receiving STA can determine the received PPDU as an EHT PPDU based on 1) the first symbol after the L-LTF signal that is BSPK, 2) the RL-SIG that is the same as the L-SIG continuously in the L-SIG field, and 3) the L-SIG including the Length field whose result of applying "modulo 3" is set to "0".

[0156] For example, the receiving STA can determine that the type of the received PPDU is a HE PPDU based on the following items. For example, 1) the first symbol after the L-LTF signal is BPSK, 2) an RL-SIG in which the L-SIG is repeated is detected, 3) when the result of applying "modulo 3" to the Length value of the L-SIG is detected as "1" or "2", the received PPDU is determined as a HE PPDU.

[0157] For example, the receiving STA can determine the type of the received PPDU as non-HT, HT, and VHT PPDU based on the following items. For example, 1) the first symbol after the L-LTF signal is BPSK, and 2) when the RL-SIG in which the L-SIG is repeated is not detected, the received PPDU is determined as non-HT, HT, and VHT PPDU. Also, even if the receiving STA detects the repetition of the RL-SIG, when the result of applying "modulo 3" to the Length value of the L-SIG is detected as "0", the received PPDU is determined as non-HT, HT, and VHT PPDU.

[0158] In the following example, signals such as (transmission / reception / upload / download) signals, (transmission / reception / upload / download) frames, (transmission / reception / upload / download) packets, (transmission / reception / upload / download) data units, and (transmission / reception / upload / download) data can be signals transmitted and received based on the PPDU in FIG. 10. The PPDU in FIG. 10 is used to transmit and receive various types of frames. For example, the PPDU in FIG. 10 is used for a control frame. An example of the control frame can include RTS (request to send), CTS (clear to send), PS-Poll (Power Save-Poll), Block ACK Req, Block Ack, NDP (Null Data Packet) announcement, and Trigger frame. For example, the PPDU in FIG. 10 is used for a management frame. An example of the management frame can include Beacon frame, (Re-)Association Request frame, (Re-)Association Response frame, Probe Request frame, and Probe Response frame. For example, the PPDU in FIG. 10 is used for a data frame. For example, the PPDU in FIG. 10 is also used to simultaneously transmit at least two or more of a control frame, a management frame, and a data frame.

[0159] FIG. 11 shows a modified example of the transmission device and / or reception device of the present specification.

[0160] Each device / STA in FIGS. 1(a) / (b) can be modified as shown in FIG. 11. The transceiver 630 in FIG. 11 can be the same as the transceivers 113 and 123 in FIG. 1. The transceiver 630 in FIG. 11 can include a receiver and a transmitter.

[0161] The processor 610 in FIG. 11 can be the same as the processors 111 and 121 in FIG. 1. Alternatively, the processor 610 in FIG. 11 can be the same as the processing chips 114 and 124 in FIG. 1.

[0162] The memory 150 in FIG. 11 can be the same as the memories 112 and 122 in FIG. 1. Alternatively, the memory 150 in FIG. 11 can be a separate external memory different from the memories 112 and 122 in FIG. 1.

[0163] Referring to FIG. 11, the power management module 611 manages the power for the processor 610 and / or the transceiver 630. The battery 612 supplies power to the power management module 611. The display 613 outputs the result processed by the processor 610. The keypad 614 receives the input used by the processor 610. The keypad 614 can be represented on the display 613. The SIM card 615 can be an integrated circuit used to securely store the IMSI (international mobile subscriber identity) and related keys for identifying and authenticating subscribers in mobile phone devices such as mobile phones and computers.

[0164] Referring to FIG. 11, the speaker 640 can output the sound-related result processed by the processor 610. The microphone 641 can receive the sound-related input used by the processor 610.

[0165] 1. Sub - carrier and resource allocation for wide - band

[0166] The wide - band described in this specification means a band with a bandwidth of 80 MHz or more (80 MHz, 160 MHz, and 320 MHz). The tone plan (or the arrangement of resource units) used on 20 MHz and 40 MHz bands is the same for 802.11ax and 802.11be (using the RU arrangements in Figures 5 and 6 as they are).

[0167] In a 20 MHz HE / EHT PPDU, the indexes of the RU data and pilot sub - carriers are fixed as follows. In the following table, the sub - carrier with a sub - carrier index of 0 corresponds to the DC tone. The sub - carrier with a negative sub - carrier index corresponds to the sub - carrier with a frequency lower than the DC tone. The sub - carrier with a positive sub - carrier index corresponds to the sub - carrier with a frequency higher than the DC tone. At this time, RU5 is the central (middle) 26 - tone RU.

[0168]

Table 3

[0169] In a 40 MHz HE / EHT PPDU, the indexes of the RU data and pilot sub - carriers are fixed as follows. In the following table, the sub - carrier with a sub - carrier index of 0 corresponds to the DC tone. The sub - carrier with a negative sub - carrier index corresponds to the sub - carrier with a frequency lower than the DC tone. The sub - carrier with a positive sub - carrier index corresponds to the sub - carrier with a frequency higher than the DC tone.

[0170]

Table 4

[0171] However, in order to define the tone plan of 802.11be to be different from that of 802.11ax for wideband, the tone plan for the 80 MHz band will be described below.

[0172] FIG. 12 shows the tone plan for the 80 MHz PPDU of the 802.11be wireless LAN system.

[0173] The tone plan and RU positions for the 20 MHz and 40 MHz PPDUs in the 802.11be wireless LAN system are the same as those in the 802.11ax wireless LAN system. FIG. 12 shows the EHT tone plan and RU positions for the 80 MHz PPDU. The EHT PPDU extended to a 160 MHz or higher band is composed of a plurality of 80 MHz sub-blocks. The tone plan for each 80 MHz sub-block is the same as the tone plan for the 80 MHz EHT PPDU. When the 80 MHz sub-blocks within the 80 / 160 / 320 MHz PPDU are not punctured and the entire 80 MHz sub-block is used as part of the RU or MRU, the 80 MHz sub-block uses the 996-tone RU shown in FIG. 12. When the 80 MHz sub-blocks within the 80 / 160 / 320 MHz PPDU are punctured or the entire 80 MHz sub-block is not used as part of the RU or MRU, the 80 MHz sub-block uses the tone plan excluding the 996-tone RU in FIG. 12.

[0174] In the 80 MHz EHT PPDU, the indices of the data and pilot sub-carriers of the RU are fixed as follows. In the following table, the sub-carrier with a sub-carrier index of 0 corresponds to the DC tone. The sub-carrier with a negative sub-carrier index corresponds to the sub-carrier having a frequency lower than the DC tone. The sub-carrier with a positive sub-carrier index corresponds to the sub-carrier having a frequency higher than the DC tone. Also, in 802.11be, since the central 26-tone RU is not defined in the tone plan for the 80 MHz band, RU19 is shown as not defined.

[0175]

Table 5

[0176] Also, in 802.11be, the tone plan for the 160 MHz band is obtained by repeating the tone plan of FIG. 12 twice, and based on the above Table 5, the indexes of the RU data and pilot subcarriers in the 160 MHz EHT PPDU are fixed. The tone plan for the 320 MHz band in 802.11be is obtained by repeating the tone plan of FIG. 12 four times, and based on the above Table 5, the indexes of the RU data and pilot subcarriers in the 320 MHz EHT PPDU are fixed.

[0177] Also, in 802.11be, an MRU (Multiple RUs) is assigned to the EHT STA, and the subcarrier indexes of the MRU are composed of the indexes of the RUs shown in the above Table 5.

[0178] non-AP STA operating at 2.20 MHz

[0179] A non-AP EHT STA operating at 20 MHz is a non-AP EHT STA whose current operating mode supports a maximum channel width of 20 MHz. The supported channel width of a non-AP EHT STA is indicated in the Supported Channel Width subfield of the HE PHY Capabilities Information field. Support for 320 MHz and the operating channel width in the 6 GHz subfield of the EHT Capabilities element are updated together with the Operating Mode Notification frame, the Operating Mode Notification element with Rx NSS type subfield equal to 0, or, if the EHT OM Control subfield does not exist in the same A-Control field, the Channel Width subfield of the OM Control subfield, or the Channel Extension subfield of the EHT OM Control subfield and the OM Control subfield transmitted by the EHT STA.

[0180] A non-AP EHT STA operating at 20 MHz is a non-AP EHT STA that can operate only at a 20 MHz channel width, such as a 20 MHz only non-AP EHT STA or a non-AP EHT STA that reduces its operating channel width to 20 MHz.

[0181] A non-AP EHT STA operating at 20 MHz shall be able to participate in 20 MHz, 40 MHz, 80 MHz, or 160 MHz EHT DL and UL OFDMA transmissions. A non-AP EHT STA operating at 20 MHz, except for a 20 MHz only non-AP EHT STA, shall also be able to participate in 320 MHz EHT DL and UL OFDMA transmissions.

[0182] When a non-AP EHT STA operating at 20 MHz participates in EHT DL and UL OFDMA transmissions with a PPDU bandwidth of 20 MHz, it needs to support 26-tone RUs, 52-tone RUs, 106-tone RUs, 242-tone RUs, 52+26-tone MRUs, and 106+26-tone MRUs. The EHT AP needs to allocate the RUs or MRUs of the 20 MHz EHT MU PPDU or EHT TB PPDU to non-AP EHT STAs operating at 20 MHz.

[0183] A non-AP EHT STA operating at 20 MHz can support 26-tone RUs, 52-tone RUs, 106-tone RUs, and 52+26-tone MRUs when participating in EHT DL and UL OFDMA transmissions with a PPDU bandwidth greater than 20 MHz and less than 320 MHz. A non-AP EHT STA operating at 20 MHz, excluding a 20 MHz only non-AP EHT STA, must also support 26-tone RUs, 52-tone RUs, 106-tone RUs, and 52+26-tone MRUs at the previously permitted locations when participating in EHT DL and UL OFDMA transmissions with a PPDU bandwidth of 320 MHz. A non-AP EHT STA operating at 20 MHz, excluding a 20 MHz only non-AP EHT STA, can also support 242-tone RUs when participating in EHT DL transmissions with a PPDU bandwidth of 320 MHz. An EHT AP with an operating channel width greater than 20 MHz can allocate RUs or MRUs in a 20 MHz channel within the BSS bandwidth in a 40 MHz, 80 MHz, or 160 MHz EHT MU PPDU or EHT TB PPDU to non-AP EHT STAs operating at 20 MHz according to the AP's operating channel width. The AP's operating channel is the same as the BSS channel width. An EHT AP with a 320 MHz operating channel width must allocate RUs or MRUs in a 20 MHz channel within the BSS bandwidth of a 320 MHz EHT MU PPDU or EHT TB PPDU to non-AP EHT STAs operating at 20 MHz, excluding a 20 MHz only non-AP EHT STA. When an EHT AP allocates an RU or MRU to a non-AP EHT STA operating at 20 MHz, the EHT AP must comply with the limitations for 20 MHz operation described below.

[0184] A non-AP EHT STA operating at 20 MHz needs to transmit preambles and data in the RU or MRU allocated within the 20 MHz channel operating in a 20 MHz, 40 MHz, 80 MHz, or 160 MHz EHT TB PPDU. A non-AP EHT STA operating at 20 MHz, except for a 20 MHz only non-AP EHT STA, also needs to transmit preambles and data in the RU or MRU allocated within the 20 MHz channel operating in a 320 MHz EHT TB PPDU. When an EHT AP allocates an RU or MRU to a non-AP EHT STA operating at 20 MHz, the EHT AP needs to comply with the restrictions on 20 MHz operation described below.

[0185] A non-AP EHT STA operating at 20 MHz needs to support preamble and data reception in the RU or MRU allocated within the 20 MHz channel operating in a 20 MHz, 40 MHz, 80 MHz, or 160 MHz EHT MU PPDU. A non-AP STA operating at 20 MHz, except for a 20 MHz only non-AP EHT STA, also needs to support preamble and data reception in the RU or MRU allocated within the 20 MHz channel operating in a 320 MHz EHT MU PPDU. The RU and MRU restrictions for 20 MHz operation are described below.

[0186] When a non-AP EHT STA operating at 20 MHz does not set up SST (Subchannel Selective Transmission) operation with the EHT AP in a non-primary 20 MHz channel, the EHT AP shall not allocate an RU or MRU outside the primary 20 MHz to the non-AP EHT STA operating at 20 MHz in an 80 MHz, 160 MHz, or 320 MHz EHT MU PPDU or EHT TB PPDU.

[0187] 3. Embodiments Applicable to this Specification

[0188] In the wireless LAN 802.11be system, in order to increase the peak throughput, a wider bandwidth than the existing 802.11ax is used or more antennas are used to consider the transmission of increased streams. In addition, this specification also considers the method of aggregating and using various bands / links.

[0189] On the other hand, it can be used in the 2.4GHz or 5GHz band for 20MHz only or operating non-AP STAs (and can also be further used in the 6GHz band). In this case, not only 20MHz PPDUs but also RUs within a specific 20MHz subchannel of 40 / 80 / 160 / 320MHz PPDUs can be allocated to 20MHz only or operating non-AP STAs to transmit and receive data. This specification proposes RUs within 20MHz that are not allocated to 20MHz only or operating STAs in such a situation. Here, a 20MHz operating STA means a non-AP EHT STA operating in the 20MHz channel width mode, such as a 20MHz only non-AP EHT STA or an EHT STA that uses OMI (Operating Mode Indication) to reduce the operating channel width to 20MHz. A 20MHz only STA is the aforementioned 20MHz only non-AP EHT STA, which is a non-AP EHT STA that indicates support for only the 20MHz channel width for the frequency band in the Supported Channel Width Set subfield of the HE PHY Capabilities Information field of the HE Capabilities element.

[0190] Figure 13 shows an example of an RU that is not allocated to 20MHz only or operating STAs in 40MHz PPDU transmission.

[0191] This specification proposes each RU and MRU within 242 RUs that cannot be assigned to 20MHz only or the operating STA in each bandwidth PPDU transmission situation. The reason why the 20MHz only or the operating STA cannot be assigned to the RU and MRU is that the tone plan of each bandwidth is different from the 20MHz tone plan, and the tones corresponding to the DC tone and the guard tone in the 20MHz receiver process are used to actually transmit data. Accordingly, since it can cause performance degradation and interference with adjacent channels, it is to limit the assignment to specific RUs and MRUs. For example, as shown in FIG. 13, in the case of 40MHz, the RU portion shown shaded corresponds to the RU including the DC or guard tone in the 20MHz receiver process.

[0192] Therefore, the RU shown shaded in FIG. 13 may not be assignable to 20MHz only or the operating STA in 40MHz transmission. However, since it may be possible to overcome the performance by the loss rate of the data subcarrier, some RUs can also be assigned to 20MHz only or the operating STA and used.

[0193] 3.1 20MHz

[0194] FIG. 14 shows an example of a 26+52-tone MRU and a 26+106-tone MRU used for 20MHz EHT PPDU OFDMA transmission.

[0195] In 20 MHz EHT PPDU transmission, the same tone plan as the existing 11ax is used. In particular, when considering 26 + 52 RU, which is one MRU, a tone plan as shown in Fig. 14 can be used. In 20 MHz EHT PPDU, 20 MHz only or the operating STA is assigned to all RUs and MRUs defined in the bandwidth.

[0196] 3.240 MHz

[0197] Fig. 15 shows an example of 26 + 52 - tone MRU and 26 + 106 - tone MRU used for 40 MHz EHT PPDU OFDMA transmission.

[0198] In 40 MHz EHT PPDU transmission, the same tone plan as the existing 11ax is used. In particular, when considering 26 + 52 RU, which is one MRU, a tone plan as shown in Fig. 15 can be used. The following proposes RUs and MRUs that are not assigned to 20 MHz only or the operating STA according to the size of each RU and MRU. The RU index described later is the same as the RU index in Table 4 above.

[0199] 26 RU: 5, 9 , 10 , the 14th 26 RU

[0200] 52 RU: 4 , 5 the [missing number]th 52 RU

[0201] 26 + 52 RU (78 RU): 5th 26RU + 2nd 52RU , 14th 26RU + 6th 52RU

[0202] 106 RU: 2 , 3 the [missing number]th 106 RU

[0203] 26 + 106 RU: 5th 26RU + 1st 106RU , 5th 26RU + 2nd 106RU , 14th 26RU + 3rd 106RU , 14th 26RU + 4th 106RU, that is, All 26 + 106RU

[0204] 242RU: All 242RU

[0205] RU and MRU within another 242RU size other than the aforementioned RU and MRU can be assigned 20MHz only or to an operating STA.

[0206] However, the RU or MRU indicated by the underline above corresponds to a 20MHz receiver process, and since the data loss rate is not large when considering DC, guard tones, etc., sufficient reliable performance can be obtained with coding gain during decoding, so it is assigned to 20MHz only or to an operating STA.

[0207] 4.3.80MHz and above bandwidth, each 80MHz subchannel

[0208] In each 80MHz subchannel of a PPDU using a bandwidth of 80MHz and above (160MHz, 320MHz), the existing 11ax and tone plan as shown in Figure 12 are used.

[0209] Figure 16 shows an example of a 26 + 52 - tone MRU used for 80MHz EHT PPDU OFDMA transmission.

[0210] Figure 16 shows a tone plan considering the 26 + 52 - tone MRU in the tone plan of Figure 12.

[0211] Figure 17 shows an example of a 26 + 106 - tone MRU used for 80MHz EHT PPDU OFDMA transmission.

[0212] Figure 17 shows a tone plan considering the 26 + 106 - tone MRU in the tone plan of Figure 12.

[0213] For each 80MHz subchannel of a PPDU that uses a bandwidth of 80MHz and above (160MHz, 320MHz), propose RU and MRU sizes of 20MHz only or RUs and MRUs that are not allocated to the operating STA as follows. The RU index described below is the same as the RU index in Table 5 above, but in Table 5, it is stated that although an index is shown for the 19th of the central 26 RUs, it is not defined. The RU index described below is shown without adding an index to the central 26 RUs. For example, the 23rd, 27th, 28th, and 32nd 26 RUs described below are denoted as RU24, RU28, RU29, and RU33 respectively in Table 5 above.

[0214] 26RU: 5, 9 , 10 , 14, 23, 27 , 28 , 32nd 26RU

[0215] 52RU: 4 , 5 , 12 , 13 th 52RU

[0216] 26 + 52RU (78RU): 5th 26RU + 2nd 52RU , 14th 26RU + 6th 52RU , 23rd 26RU + 10th 52RU , 32nd 26RU + 14th 52RU

[0217] 106RU: 2 , 3 , 6 , 7 th 106RU

[0218] 26 + 106RU: 5th 26RU + 1st 106RU , 14th 26RU + 4th 106RU , 23rd 26RU + 5th 106RU , 32nd 26RU + 8th 106RU , that is, All 26 + 106RU

[0219] 242RU: All 242RU

[0220] In addition to the above-mentioned RU and MRU, RUs and MRUs within 242 RU other than them can be assigned to 20 MHz only or the operating STA.

[0221] However, since the data loss rate does not increase significantly when considering the DC and guard corresponding to the 20 MHz receiver process for the RU or MRU marked with the underline above, sufficient reliable performance can be obtained with the coding gain during decoding, so it is assigned to 20 MHz only or the operating STA.

[0222] Although the RU or MRU marked with the underline above is said to be assigned to 20 MHz only or the operating STA, in the case of dual 26 + 52 RU and 26 + 106 RU, and all 242 RU, they may not be assigned to 20 MHz only or the operating STA due to the DC tone problem. In particular, for UL (uplink) TB (trigger-based) PPDU, the 26 + 52 RU, 26 + 106 RU, and all 242 RU may not be assigned to 20 MHz only or the operating STA. Even in DL (downlink) transmission, although it is not desirable in terms of performance to assign the RU or MRU marked with the underline above to 20 MHz only or the operating STA, it can improve the performance in implementation, so it is assigned to and used by 20 MHz only or the operating STA.

[0223] Although the RU or MRU marked with the underline above is said to be assigned to 20MHz only or the operating STA, when transmitting at 1024QAM (Quadrature Amplitude Modulation) or 4096QAM or with more than 8 streams, some or all of the underlined RU or MRU may not be assigned to 20MHz only or the operating STA. For example, when transmitting at 1024QAM or 4096QAM or with more than 8 streams, among the RU or MRU marked with the underline above, 26+52RU, 26+106RU, and all 242RU may not be assigned to 20MHz only or the operating STA.

[0224] Figure 18 is a flowchart showing the operation of the transmission device according to this embodiment.

[0225] An example of Figure 18 can be executed in the transmitting STA or the transmission device (AP and / or non-AP STA).

[0226] Among the steps of an example of Figure 18 (or the detailed sub-steps described later), some can be omitted or changed.

[0227] Through step S1810, the transmission device (transmitting STA) can obtain the information regarding the Tone plan described above. As described above, the information regarding the Tone plan includes the size, position of the RU, control information related to the RU, information regarding the frequency band in which the RU is included, information regarding the STA that receives the RU, and so on.

[0228] Through step S1820, the transmitting device can configure / generate a PPDU based on the acquired control information. The step of configuring / generating a PPDU can include the step of configuring / generating each field of the PPDU. That is, step S1820 includes the step of configuring an EHT-SIG field including control information regarding the Tone plan. That is, step S1820 can include the step of configuring a field including control information (e.g., an N-bit bitmap) indicating the size / position of the RU and / or the step of configuring a field including an identifier (e.g., an AID) of the STA that receives the RU.

[0229] Also, step S1820 can include the step of generating an STF / LTF sequence transmitted through a specific RU. The STF / LTF sequence is generated based on a preset STF generation sequence / LTF generation sequence.

[0230] Also, step S1820 can include the step of generating a data field (i.e., an MPDU) transmitted through a specific RU.

[0231] The transmitting device can transmit the PPDU configured through step S1820 to the receiving device based on step S1830.

[0232] During the execution of step S1830, the transmitting device can execute at least one of operations such as CSD, Spatial Mapping, IDFT / IFFT operations, and GI insertion.

[0233] The signal / field / sequence configured by this specification is transmitted in the form of FIG. 10.

[0234] FIG. 19 is a flowchart showing the operation of the receiving device according to this embodiment.

[0235] The above-described PPDU is received according to an example of FIG. 18.

[0236] An example of FIG. 19 can be executed in a receiving STA or a receiving device (AP and / or non-AP STA).

[0237] Among the steps of an example of FIG. 19 (or the detailed sub-steps described later), some can be omitted.

[0238] The receiving device (receiving STA) can receive all or part of the PPDU via step S1910. The received signal is in the form of FIG. 10.

[0239] The sub-step of step S1910 is determined based on step S1830 of FIG. 18. That is, step S1910 can execute an operation to restore the results of the CSD, Spatial Mapping, IDFT / IFFT operations, and GI insertion operations applied in step S1830.

[0240] In step S1920, the receiving device can perform decoding on all / part of the PPDU. Also, the receiving device can obtain control information related to the Tone plan (i.e., RU) from the decoded PPDU.

[0241] More specifically, the receiving device can decode the L-SIG and EHT-SIG of the PPDU based on the Legacy STF / LTF and obtain the information contained in the L-SIG and EHT-SIG fields. Information regarding various Tone plans (i.e., RUs) described in this specification is included in the EHT-SIG, and the receiving STA can obtain information regarding the Tone plan (i.e., RU) via the EHT-SIG.

[0242] In step S1930, the receiving device can decode the remaining part of the PPDU based on the information regarding the Tone plan (i.e., RU) acquired via step S1920. For example, the receiving STA can decode the STF / LTF field of the PPDU based on the information regarding the Tone plan (i.e., RU). Also, the receiving STA can decode the data field of the PPDU based on the information regarding the Tone plan (i.e., RU) and acquire the MPDU included in the data field.

[0243] Also, the receiving device can execute a processing operation of transferring the data decoded via step S1930 to the upper layer (e.g., MAC layer). Also, when signal generation is instructed from the upper layer corresponding to the data transferred to the upper layer to the PHY layer, subsequent operations can be executed.

[0244] In the following, with reference to FIGS. 1 to 19, the above-described embodiments will be described.

[0245] FIG. 20 is a flowchart showing a procedure for restricting and allocating RUs or MRUs to STAs that operate only in the 20 MHz band by the AP according to this embodiment.

[0246] An example of FIG. 20 can be executed in a network environment supported by a next-generation wireless LAN system (IEEE 802.11be or EHT wireless LAN system). The next-generation wireless LAN system can satisfy backward compatibility with the 802.11ax system as a wireless LAN system that improves the 802.11ax system.

[0247] An example of FIG. 20 is executed at the transmitting STA (station), and the transmitting STA can correspond to the AP (access point) STA. The receiving STA of FIG. 20 can correspond to a non-AP STA that operates only in the 20 MHz band.

[0248] This embodiment proposes a method for setting RUs (Resource Units) and MRUs (Multiple RUs) that cannot be allocated (the allocation is restricted) to a STA that operates only in the 20 MHz band in consideration of the tone plan in the 80 MHz band newly defined in the 802.11be wireless LAN system.

[0249] In step S2010, the transmitting STA (station) generates a PPDU (Physical Protocol Data Unit).

[0250] In step S2020, the transmitting STA transmits the PPDU via the frequency band already set for the receiving STA.

[0251] The receiving STA is a STA that operates only in the 20 MHz band.

[0252] The PPDU includes a preamble and a data field. The data field is received in a resource excluding the first RU (Resource Unit) and the first MRU (Multiple RUs) among the already set frequency bands. The first MRU is newly defined in the 802.11be wireless LAN system as a multiple RU in which two RUs are aggregated with each other.

[0253] When the already set frequency band is the 40 MHz band, the arrangement (or tone plan) of RUs for the 40 MHz band is as follows. The tone plan for the 40 MHz band is the same in the 802.11ax and 802.11be wireless LAN systems.

[0254] When the 40 MHz band is composed of only 26-tone RUs, the 40 MHz band includes the 26-tone RUs from the 1st to the 18th. When the 40 MHz band is composed of only 52-tone RUs, the 40 MHz band includes the 52-tone RUs from the 1st to the 8th. When the 40 MHz band is composed of only 106-tone RUs, the 40 MHz band includes the 106-tone RUs from the 1st to the 4th. When the 40 MHz band is composed of only 242-tone RUs, the 40 MHz band includes the 242-tone RUs of the 1st and the 2nd.

[0255] At this time, the 26-tone RUs from the 1st to the 18th are arranged in the order of the 26-tone RUs with lower frequencies to the 26-tone RUs with higher frequencies. The 52-tone RUs from the 1st to the 8th are arranged in the order of the 52-tone RUs with lower frequencies to the 52-tone RUs with higher frequencies. The 106-tone RUs from the 1st to the 4th are arranged in the order of the 106-tone RUs with lower frequencies to the 106-tone RUs with higher frequencies. The 242-tone RUs of the 1st and the 2nd are arranged in the order of the 242-tone RUs with lower frequencies to the 242-tone RUs with higher frequencies.

[0256] The 1st RU includes the 5th and 14th 26-tone RUs and the 1st and 2nd 242-tone RUs. That is, the 5th and 14th 26-tone RUs and the 1st and 2nd 242-tone RUs correspond to the resources not allocated to the receiving STA.

[0257] The first MRU includes an MRU in which the fifth 26-tone RU and the second 52-tone RU are aggregated, an MRU in which the fourteenth 26-tone RU and the sixth 52-tone RU are aggregated, an MRU in which the fifth 26-tone RU and the first 106-tone RU are aggregated, an MRU in which the fifth 26-tone RU and the second 106-tone RU are aggregated, an MRU in which the fourteenth 26-tone RU and the third 106-tone RU are aggregated, and an MRU in which the fourteenth 26-tone RU and the fourth 106-tone RU are aggregated. That is, the multiple RUs included in the first MRU also correspond to resources that are not allocated to the receiving STA.

[0258] This embodiment proposes a method in which, when the receiving STA operating only in the 20 MHz band receives an OFDMA PPDU via the 40 MHz band, the receiving STA is allocated only to the remaining resource units excluding the first RU and the first MRU. In this way, there is a new effect that performance degradation and interference with adjacent channels can be prevented by preventing data from being placed on tones corresponding to the DC tone and the guard tone in the 20 MHz band in which the receiving STA can operate.

[0259] Also, when the receiving STA operating only in the 20 MHz band receives an OFDMA PPDU via the 80 MHz band, the method in which the receiving STA is allocated only to the remaining resource units excluding the first RU and the first MRU can be proposed as follows.

[0260] When the already set frequency band is the 80 MHz band, the arrangement (or tone plan) of the RUs for the 80 MHz band is as follows. Since the tone plan for the 80 MHz band proposed in the 802.11be wireless LAN system is different from the tone plan for the 80 MHz band proposed in 802.11ax, it is necessary to newly set for the RU and MRU restrictions.

[0261] When the 80 MHz band is composed of only 26-tone RUs, the 80 MHz band can include 26-tone RUs from the first to the 36th. When the 80 MHz band is composed of only 52-tone RUs, the 80 MHz band can include 52-tone RUs from the first to the 16th. When the 80 MHz band is composed of only 106-tone RUs, the 80 MHz band can include 106-tone RUs from the first to the 8th. When the 80 MHz band is composed of only 242-tone RUs, the 80 MHz band can include 242-tone RUs from the first to the 4th.

[0262] At this time, the 26-tone RUs from the first to the 36th are arranged in ascending order of the 26-tone RUs with lower frequencies to those with higher frequencies, the 52-tone RUs from the first to the 16th are arranged in ascending order of the 52-tone RUs with lower frequencies to those with higher frequencies, the 106-tone RUs from the first to the 8th are arranged in ascending order of the 106-tone RUs with lower frequencies to those with higher frequencies, and the 242-tone RUs from the first to the 4th are arranged in ascending order of the 242-tone RUs with lower frequencies to those with higher frequencies.

[0263] The first RU can include the 26-tone RUs of the 5th, 14th, 23rd, and 32nd and the 242-tone RUs from the first to the 4th. That is, the 26-tone RUs of the 5th, 14th, 23rd, and 32nd and the 242-tone RUs from the first to the 4th correspond to resources not allocated to the receiving STA.

[0264] The first MRU may include an MRU formed by aggregating the fifth 26-tone RU and the second 52-tone RU, an MRU formed by aggregating the fourteenth 26-tone RU and the sixth 52-tone RU, an MRU formed by aggregating the twenty-third 26-tone RU and the tenth 52-tone RU, an MRU formed by aggregating the thirty-second 26-tone RU and the fourteenth 52-tone RU, an MRU formed by aggregating the fifth 26-tone RU and the first 106-tone RU, an MRU formed by aggregating the fourteenth 26-tone RU and the fourth 106-tone RU, an MRU formed by aggregating the twenty-third 26-tone RU and the fifth 106-tone RU, and an MRU formed by aggregating the thirty-second 26-tone RU and the eighth 106-tone RU. That is, the multiple RUs included in the first MRU also correspond to resources that are not allocated to the receiving STA.

[0265] Also, when the receiving STA operating only in the 20 MHz band receives an OFDMA PPDU via the 160 MHz band, a method can be proposed in which the receiving STA is allocated only to the remaining resource units excluding the first RU and the first MRU.

[0266] When the already set frequency band is the 160 MHz band, the arrangement (or tone plan) of the RUs for the 160 MHz band is as follows. The tone plan for the 160 MHz band proposed in the 802.11be wireless LAN system is the same as the tone plan for the 80 MHz band proposed in the 802.11be wireless LAN system repeated twice. The 160 MHz band may include first and second 80 MHz subchannels.

[0267] When the first 80 MHz subchannel is composed of only 26-tone RUs, the first 80 MHz subchannel includes the 26-tone RUs from the first to the 36th. When the first 80 MHz subchannel is composed of only 52-tone RUs, the first 80 MHz subchannel includes the 52-tone RUs from the first to the 16th. When the first 80 MHz subchannel is composed of only 106-tone RUs, the first 80 MHz subchannel includes the 106-tone RUs from the first to the 8th. When the first 80 MHz subchannel is composed of only 242-tone RUs, the first 80 MHz subchannel can include the 242-tone RUs from the first to the 4th.

[0268] When the second 80 MHz subchannel is composed of only 26-tone RUs, the second 80 MHz subchannel includes the 26-tone RUs from the 37th to the 72nd. When the second 80 MHz subchannel is composed of only 52-tone RUs, the second 80 MHz subchannel includes the 52-tone RUs from the 17th to the 32nd. When the second 80 MHz subchannel is composed of only 106-tone RUs, the second 80 MHz subchannel includes the 106-tone RUs from the 9th to the 16th. When the second 80 MHz subchannel is composed of only 242-tone RUs, the second 80 MHz subchannel can include the 242-tone RUs from the 5th to the 8th.

[0269] At this time, the 26-tone RUs from the first to the 72nd are arranged in the order of the 26-tone RUs with lower frequencies to the 26-tone RUs with higher frequencies. The 52-tone RUs from the first to the 32nd are arranged in the order of the 52-tone RUs with lower frequencies to the 52-tone RUs with higher frequencies. The 106-tone RUs from the first to the 16th are arranged in the order of the 106-tone RUs with lower frequencies to the 106-tone RUs with higher frequencies. The 242-tone RUs from the first to the 8th are arranged in the order of the 242-tone RUs with lower frequencies to the 242-tone RUs with higher frequencies.

[0270] The first RU can include the 26 - tone RUs of the 5th, 14th, 23rd, 32nd, 41st, 50th, 59th, and 68th, and the 242 - tone RUs from the 1st to the 8th. That is, the 26 - tone RUs of the 5th, 14th, 23rd, 32nd, 41st, 50th, 59th, and 68th, and the 242 - tone RUs from the 1st to the 8th correspond to resources not allocated to the receiving STA.

[0271] The first MRU can include an MRU in which the 26 - tone RU of the 5th and the 52 - tone RU of the 2nd are aggregated, an MRU in which the 26 - tone RU of the 14th and the 52 - tone RU of the 6th are aggregated, an MRU in which the 26 - tone RU of the 23rd and the 52 - tone RU of the 10th are aggregated, an MRU in which the 26 - tone RU of the 32nd and the 52 - tone RU of the 14th are aggregated, an MRU in which the 26 - tone RU of the 41st and the 52 - tone RU of the 18th are aggregated, an MRU in which the 26 - tone RU of the 50th and the 52 - tone RU of the 22nd are aggregated, an MRU in which the 26 - tone RU of the 59th and the 52 - tone RU of the 26th are aggregated, an MRU in which the 26 - tone RU of the 68th and the 52 - tone RU of the 30th are aggregated, an MRU in which the 26 - tone RU of the 5th and the 106 - tone RU of the 1st are aggregated, an MRU in which the 26 - tone RU of the 14th and the 106 - tone RU of the 4th are aggregated, an MRU in which the 26 - tone RU of the 23rd and the 106 - tone RU of the 5th are aggregated, an MRU in which the 26 - tone RU of the 32nd and the 106 - tone RU of the 8th are aggregated, an MRU in which the 26 - tone RU of the 41st and the 106 - tone RU of the 9th are aggregated, an MRU in which the 26 - tone RU of the 50th and the 106 - tone RU of the 12th are aggregated, an MRU in which the 26 - tone RU of the 59th and the 106 - tone RU of the 13th are aggregated, and an MRU in which the 26 - tone RU of the 68th and the 106 - tone RU of the 16th are aggregated. That is, the aggregated RUs included in the first MRU also correspond to resources not allocated to the receiving STA.

[0272] Also, when the receiving STA that operates only in the 20 MHz band receives an OFDMA PPDU via the 320 MHz band, a method in which the receiving STA is allocated only to the remaining resource units excluding the first RU and the first MRU can be proposed as follows.

[0273] When the already set frequency band is the 320 MHz band, the RU arrangement (or tone plan) for the 320 MHz band is as follows. The tone plan for the 320 MHz band proposed in the 802.11be wireless LAN system is the same as the tone plan for the 80 MHz band proposed in the 802.11be wireless LAN system repeated four times. The 320 MHz band can include first to fourth 80 MHz subchannels.

[0274] When the first 80 MHz subchannel is composed only of 26-tone RUs, the first 80 MHz subchannel includes first to 36th 26-tone RUs. When the first 80 MHz subchannel is composed only of 52-tone RUs, the first 80 MHz subchannel includes first to 16th 52-tone RUs. When the first 80 MHz subchannel is composed only of 106-tone RUs, the first 80 MHz subchannel includes first to 8th 106-tone RUs. When the first 80 MHz subchannel is composed only of 242-tone RUs, the first 80 MHz subchannel can include first to 4th 242-tone RUs.

[0275] When the second 80 MHz subchannel is composed of only 26-tone RUs, the second 80 MHz subchannel includes 26-tone RUs from the 37th to the 72nd. When the second 80 MHz subchannel is composed of only 52-tone RUs, the second 80 MHz subchannel includes 52-tone RUs from the 17th to the 32nd. When the second 80 MHz subchannel is composed of only 106-tone RUs, the second 80 MHz subchannel includes 106-tone RUs from the 9th to the 16th. When the second 80 MHz subchannel is composed of only 242-tone RUs, the second 80 MHz subchannel can include 242-tone RUs from the 5th to the 8th.

[0276] When the third 80 MHz subchannel is composed of only 26-tone RUs, the third 80 MHz subchannel includes 26-tone RUs from the 73rd to the 108th. When the third 80 MHz subchannel is composed of only 52-tone RUs, the third 80 MHz subchannel includes 52-tone RUs from the 33rd to the 48th. When the third 80 MHz subchannel is composed of only 106-tone RUs, the third 80 MHz subchannel includes 106-tone RUs from the 17th to the 24th. When the third 80 MHz subchannel is composed of only 242-tone RUs, the third 80 MHz subchannel can include 242-tone RUs from the 9th to the 12th.

[0277] When the fourth 80 MHz subchannel is composed of only 26-tone RUs, the fourth 80 MHz subchannel includes 26-tone RUs from the 109th to the 144th. When the fourth 80 MHz subchannel is composed of only 52-tone RUs, the fourth 80 MHz subchannel includes 52-tone RUs from the 49th to the 64th. When the fourth 80 MHz subchannel is composed of only 106-tone RUs, the fourth 80 MHz subchannel includes 106-tone RUs from the 25th to the 32nd. When the fourth 80 MHz subchannel is composed of only 242-tone RUs, the fourth 80 MHz subchannel can include 242-tone RUs from the 13th to the 16th.

[0278] At this time, the 26-tone RUs from the 1st to the 144th are arranged in ascending order of the 26-tone RUs with lower frequencies to the 26-tone RUs with higher frequencies, the 52-tone RUs from the 1st to the 64th are arranged in ascending order of the 52-tone RUs with lower frequencies to the 52-tone RUs with higher frequencies, the 106-tone RUs from the 1st to the 32nd are arranged in ascending order of the 106-tone RUs with lower frequencies to the 106-tone RUs with higher frequencies, and the 242-tone RUs from the 1st to the 16th are arranged in ascending order of the 242-tone RUs with lower frequencies to the 242-tone RUs with higher frequencies.

[0279] The 1st RU may include the 26-tone RUs of the 5th, 14th, 23rd, 32nd, 41st, 50th, 59th, 68th, 77th, 86th, 95th, 104th, 113th, 122nd, 131st, and 140th and the 242-tone RUs from the 1st to the 16th. That is, the 26-tone RUs of the 5th, 14th, 23rd, 32nd, 41st, 50th, 59th, 68th, 77th, 86th, 95th, 104th, 113th, 122nd, 131st, and 140th and the 242-tone RUs from the 1st to the 16th correspond to resources not allocated to the receiving STA.

[0280] The first MRU is an MRU in which the fifth 26 - tone RU and the second 52 - tone RU are aggregated, an MRU in which the fourteenth 26 - tone RU and the sixth 52 - tone RU are aggregated, an MRU in which the twenty - third 26 - tone RU and the tenth 52 - tone RU are aggregated, an MRU in which the thirty - second 26 - tone RU and the fourteenth 52 - tone RU are aggregated, an MRU in which the forty - first 26 - tone RU and the eighteenth 52 - tone RU are aggregated, an MRU in which the fiftieth 26 - tone RU and the twenty - second 52 - tone RU are aggregated, an MRU in which the fifty - ninth 26 - tone RU and the twenty - sixth 52 - tone RU are aggregated, an MRU in which the sixty - eighth 26 - tone RU and the thirtieth 52 - tone RU are aggregated, an MRU in which the seventy - seventh 26 - tone RU and the thirty - fourth 52 - tone RU are aggregated, an MRU in which the eighty - sixth 26 - tone RU and the thirty - eighth 52 - tone RU are aggregated, an MRU in which the ninety - fifth 26 - tone RU and the forty - second 52 - tone RU are aggregated, an MRU in which the one - hundred - fourth 26 - tone RU and the forty - sixth 52 - tone RU are aggregated, an MRU in which the one - hundred - thirteenth 26 - tone RU and the fiftieth 52 - tone RU are aggregated, an MRU in which the one - hundred - twenty - second 26 - tone RU and the fifty - fourth 52 - tone RU are aggregated, an MRU in which the one - hundred - thirty - first 26 - tone RU and the fifty - eighth 52 - tone RU are aggregated, an MRU in which the one - hundred - fortieth 26 - tone RU and the sixty - second 52 - tone RU are aggregated, an MRU in which the fifth 26 - tone RU and the first 106 - tone RU are aggregated, an MRU in which the fourteenth 26 - tone RU and the fourth 106 - tone RU are aggregated, an MRU in which the twenty - third 26 - tone RU and the fifth 106 - tone RU are aggregated, an MRU in which the thirty - second 26 - tone RU and the eighth 106 - tone RU are aggregated, an MRU in which the forty - first 26 - tone RU and the ninth 106 - tone RU are aggregated, an MRU in which the fiftieth 26 - tone RU and the twelfth 106 - tone RU are aggregated, an MRU in which the fifty - ninth 26 - tone RU and the thirteenth 106 - tone RU are aggregated, an MRU in which the sixty - eighth 26 - tone RU and the sixteenth 106 - tone RU are aggregated,The MRU in which the 77th 26-tone RU and the 17th 106-tone RU are aggregated, the MRU in which the 86th 26-tone RU and the 20th 106-tone RU are aggregated, the MRU in which the 95th 26-tone RU and the 21st 106-tone RU are aggregated, the MRU in which the 104th 26-tone RU and the 24th 106-tone RU are aggregated, the MRU in which the 113th 26-tone RU and the 25th 106-tone RU are aggregated, the MRU in which the 122nd 26-tone RU and the 28th 106-tone RU are aggregated, the MRU in which the 131st 26-tone RU and the 29th 106-tone RU are aggregated, and the MRU in which the 140th 26-tone RU and the 32nd 106-tone RU are aggregated can be included. That is, the multiple RUs included in the first MRU also correspond to resources that are not allocated to the receiving STA.,

[0281] The PPDU can be a DL OFDMA PPDU or a UL OFDMA PPDU. When the PPDU is a DL OFDMA PPDU, the transmitting STA transmits an EHT (Extremely High Throughput) MU (Multi User) PPDU to the receiving STA, and the receiving STA can decode the EHT MU PPDU in the resources excluding the first RU and the first MRU among the already set frequency bands. When the PPDU is a UL OFDMA PPDU, the transmitting STA becomes a STA that operates only in the 20 MHz band, the transmitting STA receives a trigger frame from a receiving STA (here, an AP), and the transmitting STA can transmit an EHT TB (Trigger Based) PPDU to the receiving STA. At this time, the EHT TB PPDU is transmitted in the resources excluding the first RU and the first MRU among the already set frequency bands. The EHT MU PPDU can include an L-STF (Legacy-Short Training Field), an L-LTF (Legacy-Long Training Field), an L-SIG (Legacy-Signal), an RL-SIG (Repeated L-SIG), a U-SIG (Universal-Signal), an EHT-SIG, an EHT-STF, and EHT-LTFs data fields. The EHT TB PPDU is defined in a format excluding the EHT-SIG in the EHT MU PPDU.

[0282] Also, when the PPDU is a DL OFDMA PPDU, the 242-tone RUs included in the already set frequency band are selectively allocated. For example, when the PPDU is a DL OFDMA PPDU received via a 40 MHz band, the first RU can selectively include the first and second 242-tone RUs. That is, the transmitting STA can selectively allocate the first and second 242-tone RUs to the receiving STA. When the first RU includes only the first 242-tone RU and does not include the second 242-tone RU, the receiving STA can receive the DL OFDMA PPDU via the second 242-tone RU (when the receiving STA has the capability for the second 242-tone RU). The same applies when the already set frequency band is an 80 MHz, 160 MHz, or 320 MHz band.

[0283] FIG. 21 is a flowchart showing a procedure in which a STA operating only in a 20 MHz band according to the present embodiment is restricted and allocated an RU or an MRU.

[0284] An example of FIG. 21 can be executed in a network environment supported by a next-generation wireless LAN system (IEEE 802.11be or EHT wireless LAN system). The next-generation wireless LAN system can satisfy backward compatibility with the 802.11ax system as a wireless LAN system that improves the 802.11ax system.

[0285] An example of FIG. 21 is executed at a receiving STA (station), and the receiving STA can correspond to a non-AP STA that operates only in a 20 MHz band. The transmitting STA of FIG. 21 can correspond to an AP (access point) STA.

[0286] This embodiment proposes a method for setting RUs (Resource Units) and MRUs (Multiple RUs) that are not allocated (allocation is restricted) to STAs (Stations) that operate only in the 20 MHz band, considering the tone plan in the 80 MHz band newly defined in the 802.11be wireless LAN system.

[0287] In step S2110, the receiving STA (station) receives a PPDU (Physical Protocol Data Unit) from the transmitting STA via the already set frequency band.

[0288] In step S2120, the receiving STA decodes the PPDU.

[0289] The receiving STA is a STA that operates only in the 20 MHz band.

[0290] The PPDU includes a preamble and a data field. The data field is received in the resources excluding the first RU (Resource Unit) and the first MRU (Multiple RUs) in the already set frequency band. The first MRU is a multiple RU in which two RUs are aggregated with each other and is newly defined in the 802.11be wireless LAN system.

[0291] When the already set frequency band is the 40 MHz band, the arrangement (or tone plan) of the RUs for the 40 MHz band is as follows. The tone plan for the 40 MHz band is the same in the 802.11ax and 802.11be wireless LAN systems.

[0292] When the 40 MHz band is composed of only 26 - tone RUs, the 40 MHz band includes the 1st to 18th 26 - tone RUs. When the 40 MHz band is composed of only 52 - tone RUs, the 40 MHz band includes the 1st to 8th 52 - tone RUs. When the 40 MHz band is composed of only 106 - tone RUs, the 40 MHz band includes the 1st to 4th 106 - tone RUs. When the 40 MHz band is composed of only 242 - tone RUs, the 40 MHz band includes the 1st and 2nd 242 - tone RUs.

[0293] At this time, the 1st to 18th 26 - tone RUs are arranged in the order from the 26 - tone RU with a lower frequency to the 26 - tone RU with a higher frequency. The 1st to 8th 52 - tone RUs are arranged in the order from the 52 - tone RU with a lower frequency to the 52 - tone RU with a higher frequency. The 1st to 4th 106 - tone RUs are arranged in the order from the 106 - tone RU with a lower frequency to the 106 - tone RU with a higher frequency. The 1st and 2nd 242 - tone RUs are arranged in the order from the 242 - tone RU with a lower frequency to the 242 - tone RU with a higher frequency.

[0294] The 1st RU includes the 5th and 14th 26 - tone RUs and the 1st and 2nd 242 - tone RUs. That is, the 5th and 14th 26 - tone RUs and the 1st and 2nd 242 - tone RUs correspond to resources not allocated to the receiving STA.

[0295] The first MRU includes an MRU in which the fifth 26-tone RU and the second 52-tone RU are aggregated, an MRU in which the fourteenth 26-tone RU and the sixth 52-tone RU are aggregated, an MRU in which the fifth 26-tone RU and the first 106-tone RU are aggregated, an MRU in which the fifth 26-tone RU and the second 106-tone RU are aggregated, an MRU in which the fourteenth 26-tone RU and the third 106-tone RU are aggregated, and an MRU in which the fourteenth 26-tone RU and the fourth 106-tone RU are aggregated. That is, the multiple RUs included in the first MRU also correspond to resources that are not allocated to the receiving STA.

[0296] This embodiment proposes a method in which, when the receiving STA operating only in the 20 MHz band receives an OFDMA PPDU via the 40 MHz band, the receiving STA is allocated only to the remaining resource units excluding the first RU and the first MRU. In this way, there is a new effect that performance degradation and interference with adjacent channels can be prevented by preventing data from being placed on tones corresponding to DC tones and guard tones in the 20 MHz band in which the receiving STA can operate.

[0297] Also, when the receiving STA operating only in the 20 MHz band receives an OFDMA PPDU via the 80 MHz band, the method in which the receiving STA is allocated only to the remaining resource units excluding the first RU and the first MRU can be proposed as follows.

[0298] When the already set frequency band is the 80 MHz band, the arrangement (or tone plan) of the RUs for the 80 MHz band is as follows. Since the tone plan for the 80 MHz band proposed in the 802.11be wireless LAN system is different from the tone plan for the 80 MHz band proposed in 802.11ax, it is necessary to newly set the RU and MRU limits.

[0299] When the 80 MHz band is composed of only 26-tone RUs, the 80 MHz band can include the 1st to 36th 26-tone RUs. When the 80 MHz band is composed of only 52-tone RUs, the 80 MHz band can include the 1st to 16th 52-tone RUs. When the 80 MHz band is composed of only 106-tone RUs, the 80 MHz band can include the 1st to 8th 106-tone RUs. When the 80 MHz band is composed of only 242-tone RUs, the 80 MHz band can include the 1st to 4th 242-tone RUs.

[0300] At this time, the 1st to 36th 26-tone RUs are arranged in ascending order of the 26-tone RUs with lower frequencies to the 26-tone RUs with higher frequencies, the 1st to 16th 52-tone RUs are arranged in ascending order of the 52-tone RUs with lower frequencies to the 52-tone RUs with higher frequencies, the 1st to 8th 106-tone RUs are arranged in ascending order of the 106-tone RUs with lower frequencies to the 106-tone RUs with higher frequencies, and the 1st to 4th 242-tone RUs are arranged in ascending order of the 242-tone RUs with lower frequencies to the 242-tone RUs with higher frequencies.

[0301] The 1st RU can include the 5th, 14th, 23rd, and 32nd 26-tone RUs and the 1st to 4th 242-tone RUs. That is, the 5th, 14th, 23rd, and 32nd 26-tone RUs and the 1st to 4th 242-tone RUs correspond to resources not allocated to the receiving STA.

[0302] The first MRU can include an MRU in which the fifth 26-tone RU and the second 52-tone RU are aggregated, an MRU in which the fourteenth 26-tone RU and the sixth 52-tone RU are aggregated, an MRU in which the twenty-third 26-tone RU and the tenth 52-tone RU are aggregated, an MRU in which the thirty-second 26-tone RU and the fourteenth 52-tone RU are aggregated, an MRU in which the fifth 26-tone RU and the first 106-tone RU are aggregated, an MRU in which the fourteenth 26-tone RU and the fourth 106-tone RU are aggregated, an MRU in which the twenty-third 26-tone RU and the fifth 106-tone RU are aggregated, and an MRU in which the thirty-second 26-tone RU and the eighth 106-tone RU are aggregated. That is, the multiple RUs included in the first MRU also correspond to resources that cannot be allocated to the receiving STA.

[0303] Also, when the receiving STA that operates only in the 20 MHz band receives an OFDMA PPDU via the 160 MHz band, a method in which the receiving STA is allocated only to the remaining resource units excluding the first RU and the first MRU can be proposed as follows.

[0304] When the already set frequency band is the 160 MHz band, the arrangement (or tone plan) of the RUs for the 160 MHz band is as follows. The tone plan for the 160 MHz band proposed in the 802.11be wireless LAN system is the same as the tone plan obtained by repeating the tone plan for the 80 MHz band proposed in the 802.11be wireless LAN system twice. The 160 MHz band can include first and second 80 MHz subchannels.

[0305] When the first 80 MHz subchannel is composed of only 26-tone RUs, the first 80 MHz subchannel includes the 26-tone RUs from the first to the 36th. When the first 80 MHz subchannel is composed of only 52-tone RUs, the first 80 MHz subchannel includes the 52-tone RUs from the first to the 16th. When the first 80 MHz subchannel is composed of only 106-tone RUs, the first 80 MHz subchannel includes the 106-tone RUs from the first to the 8th. When the first 80 MHz subchannel is composed of only 242-tone RUs, the first 80 MHz subchannel can include the 242-tone RUs from the first to the 4th.

[0306] When the second 80 MHz subchannel is composed of only 26-tone RUs, the second 80 MHz subchannel includes the 26-tone RUs from the 37th to the 72nd. When the second 80 MHz subchannel is composed of only 52-tone RUs, the second 80 MHz subchannel includes the 52-tone RUs from the 17th to the 32nd. When the second 80 MHz subchannel is composed of only 106-tone RUs, the second 80 MHz subchannel includes the 106-tone RUs from the 9th to the 16th. When the second 80 MHz subchannel is composed of only 242-tone RUs, the second 80 MHz subchannel can include the 242-tone RUs from the 5th to the 8th.

[0307] At this time, the 26-tone RUs from the first to the 72nd are arranged in ascending order of frequency from the 26-tone RU with the lowest frequency to the 26-tone RU with the highest frequency. The 52-tone RUs from the first to the 32nd are arranged in ascending order of frequency from the 52-tone RU with the lowest frequency to the 52-tone RU with the highest frequency. The 106-tone RUs from the first to the 16th are arranged in ascending order of frequency from the 106-tone RU with the lowest frequency to the 106-tone RU with the highest frequency. The 242-tone RUs from the first to the 8th are arranged in ascending order of frequency from the 242-tone RU with the lowest frequency to the 242-tone RU with the highest frequency.

[0308] The first RU can include the 26 - tone RUs of the 5th, 14th, 23rd, 32nd, 41st, 50th, 59th, and 68th, and the 242 - tone RUs from the 1st to the 8th. That is, the 26 - tone RUs of the 5th, 14th, 23rd, 32nd, 41st, 50th, 59th, and 68th, and the 242 - tone RUs from the 1st to the 8th correspond to resources not allocated to the receiving STA.

[0309] The first MRU can include an MRU in which the 26 - tone RU of the 5th and the 52 - tone RU of the 2nd are aggregated, an MRU in which the 26 - tone RU of the 14th and the 52 - tone RU of the 6th are aggregated, an MRU in which the 26 - tone RU of the 23rd and the 52 - tone RU of the 10th are aggregated, an MRU in which the 26 - tone RU of the 32nd and the 52 - tone RU of the 14th are aggregated, an MRU in which the 26 - tone RU of the 41st and the 52 - tone RU of the 18th are aggregated, an MRU in which the 26 - tone RU of the 50th and the 52 - tone RU of the 22nd are aggregated, an MRU in which the 26 - tone RU of the 59th and the 52 - tone RU of the 26th are aggregated, an MRU in which the 26 - tone RU of the 68th and the 52 - tone RU of the 30th are aggregated, an MRU in which the 26 - tone RU of the 5th and the 106 - tone RU of the 1st are aggregated, an MRU in which the 26 - tone RU of the 14th and the 106 - tone RU of the 4th are aggregated, an MRU in which the 26 - tone RU of the 23rd and the 106 - tone RU of the 5th are aggregated, an MRU in which the 26 - tone RU of the 32nd and the 106 - tone RU of the 8th are aggregated, an MRU in which the 26 - tone RU of the 41st and the 106 - tone RU of the 9th are aggregated, an MRU in which the 26 - tone RU of the 50th and the 106 - tone RU of the 12th are aggregated, an MRU in which the 26 - tone RU of the 59th and the 106 - tone RU of the 13th are aggregated, and an MRU in which the 26 - tone RU of the 68th and the 106 - tone RU of the 16th are aggregated. That is, the multiple RUs included in the first MRU also correspond to resources not allocated to the receiving STA.

[0310] Also, when the receiving STA that operates only in the 20 MHz band receives an OFDMA PPDU via the 320 MHz band, the method in which the receiving STA is allocated only to the remaining resource units excluding the first RU and the first MRU can be proposed as follows.

[0311] When the already set frequency band is the 320 MHz band, the arrangement (or tone plan) of the RUs for the 320 MHz band is as follows. The tone plan for the 320 MHz band proposed in the 802.11be wireless LAN system is the same as the tone plan for the 80 MHz band proposed in the 802.11be wireless LAN system repeated four times. The 320 MHz band can include first to fourth 80 MHz subchannels.

[0312] When the first 80 MHz subchannel is composed only of 26-tone RUs, the first 80 MHz subchannel includes first to 36th 26-tone RUs. When the first 80 MHz subchannel is composed only of 52-tone RUs, the first 80 MHz subchannel includes first to 16th 52-tone RUs. When the first 80 MHz subchannel is composed only of 106-tone RUs, the first 80 MHz subchannel includes first to 8th 106-tone RUs. When the first 80 MHz subchannel is composed only of 242-tone RUs, the first 80 MHz subchannel can include first to 4th 242-tone RUs.

[0313] When the second 80 MHz subchannel is composed of only 26-tone RUs, the second 80 MHz subchannel includes 26-tone RUs from the 37th to the 72nd. When the second 80 MHz subchannel is composed of only 52-tone RUs, the second 80 MHz subchannel includes 52-tone RUs from the 17th to the 32nd. When the second 80 MHz subchannel is composed of only 106-tone RUs, the second 80 MHz subchannel includes 106-tone RUs from the 9th to the 16th. When the second 80 MHz subchannel is composed of only 242-tone RUs, the second 80 MHz subchannel can include 242-tone RUs from the 5th to the 8th.

[0314] When the third 80 MHz subchannel is composed of only 26-tone RUs, the third 80 MHz subchannel includes 26-tone RUs from the 73rd to the 108th. When the third 80 MHz subchannel is composed of only 52-tone RUs, the third 80 MHz subchannel includes 52-tone RUs from the 33rd to the 48th. When the third 80 MHz subchannel is composed of only 106-tone RUs, the third 80 MHz subchannel includes 106-tone RUs from the 17th to the 24th. When the third 80 MHz subchannel is composed of only 242-tone RUs, the third 80 MHz subchannel can include 242-tone RUs from the 9th to the 12th.

[0315] When the fourth 80 MHz subchannel is composed of only 26-tone RUs, the fourth 80 MHz subchannel includes 26-tone RUs from the 109th to the 144th. When the fourth 80 MHz subchannel is composed of only 52-tone RUs, the fourth 80 MHz subchannel includes 52-tone RUs from the 49th to the 64th. When the fourth 80 MHz subchannel is composed of only 106-tone RUs, the fourth 80 MHz subchannel includes 106-tone RUs from the 25th to the 32nd. When the fourth 80 MHz subchannel is composed of only 242-tone RUs, the fourth 80 MHz subchannel can include 242-tone RUs from the 13th to the 16th.

[0316] At this time, the 26-tone RUs from the 1st to the 144th are arranged in ascending order of the 26-tone RUs with lower frequencies to the 26-tone RUs with higher frequencies, the 52-tone RUs from the 1st to the 64th are arranged in ascending order of the 52-tone RUs with lower frequencies to the 52-tone RUs with higher frequencies, the 106-tone RUs from the 1st to the 32nd are arranged in ascending order of the 106-tone RUs with lower frequencies to the 106-tone RUs with higher frequencies, and the 242-tone RUs from the 1st to the 16th are arranged in ascending order of the 242-tone RUs with lower frequencies to the 242-tone RUs with higher frequencies.

[0317] The 1st RU can include the 26-tone RUs of the 5th, 14th, 23rd, 32nd, 41st, 50th, 59th, 68th, 77th, 86th, 95th, 104th, 113th, 122nd, 131st, and 140th, and the 242-tone RUs from the 1st to the 16th. That is, the 26-tone RUs of the 5th, 14th, 23rd, 32nd, 41st, 50th, 59th, 68th, 77th, 86th, 95th, 104th, 113th, 122nd, 131st, and 140th, and the 242-tone RUs from the 1st to the 16th correspond to resources not allocated to the receiving STA.

[0318] The first MRU is an MRU in which the fifth 26 - tone RU and the second 52 - tone RU are aggregated, an MRU in which the fourteenth 26 - tone RU and the sixth 52 - tone RU are aggregated, an MRU in which the twenty - third 26 - tone RU and the tenth 52 - tone RU are aggregated, an MRU in which the thirty - second 26 - tone RU and the fourteenth 52 - tone RU are aggregated, an MRU in which the forty - first 26 - tone RU and the eighteenth 52 - tone RU are aggregated, an MRU in which the fiftieth 26 - tone RU and the twenty - second 52 - tone RU are aggregated, an MRU in which the fifty - ninth 26 - tone RU and the twenty - sixth 52 - tone RU are aggregated, an MRU in which the sixty - eighth 26 - tone RU and the thirtieth 52 - tone RU are aggregated, an MRU in which the seventy - seventh 26 - tone RU and the thirty - fourth 52 - tone RU are aggregated, an MRU in which the eighty - sixth 26 - tone RU and the thirty - eighth 52 - tone RU are aggregated, an MRU in which the ninety - fifth 26 - tone RU and the forty - second 52 - tone RU are aggregated, an MRU in which the one - hundred - fourth 26 - tone RU and the forty - sixth 52 - tone RU are aggregated, an MRU in which the one - hundred - thirteenth 26 - tone RU and the fiftieth 52 - tone RU are aggregated, an MRU in which the one - hundred - twenty - second 26 - tone RU and the fifty - fourth 52 - tone RU are aggregated, an MRU in which the one - hundred - thirty - first 26 - tone RU and the fifty - eighth 52 - tone RU are aggregated, an MRU in which the one - hundred - fortieth 26 - tone RU and the sixty - second 52 - tone RU are aggregated, an MRU in which the fifth 26 - tone RU and the first 106 - tone RU are aggregated, an MRU in which the fourteenth 26 - tone RU and the fourth 106 - tone RU are aggregated, an MRU in which the twenty - third 26 - tone RU and the fifth 106 - tone RU are aggregated, an MRU in which the thirty - second 26 - tone RU and the eighth 106 - tone RU are aggregated, an MRU in which the forty - first 26 - tone RU and the ninth 106 - tone RU are aggregated, an MRU in which the fiftieth 26 - tone RU and the twelfth 106 - tone RU are aggregated, an MRU in which the fifty - ninth 26 - tone RU and the thirteenth 106 - tone RU are aggregated, an MRU in which the sixty - eighth 26 - tone RU and the sixteenth 106 - tone RU are aggregated,The MRU in which the 77th 26-tone RU and the 17th 106-tone RU are aggregated, the MRU in which the 86th 26-tone RU and the 20th 106-tone RU are aggregated, the MRU in which the 95th 26-tone RU and the 21st 106-tone RU are aggregated, the MRU in which the 104th 26-tone RU and the 24th 106-tone RU are aggregated, the MRU in which the 113th 26-tone RU and the 25th 106-tone RU are aggregated, the MRU in which the 122nd 26-tone RU and the 28th 106-tone RU are aggregated, the MRU in which the 131st 26-tone RU and the 29th 106-tone RU are aggregated, and the MRU in which the 140th 26-tone RU and the 32nd 106-tone RU are aggregated can be included. That is, the multiple RUs included in the first MRU also correspond to resources that are not allocated to the receiving STA.,

[0319] The PPDU may be a DL OFDMA PPDU or a UL OFDMA PPDU. When the PPDU is a DL OFDMA PPDU, the transmitting STA transmits an EHT (Extremely High Throughput) MU (Multi User) PPDU to the receiving STA, and the receiving STA can decode the EHT MU PPDU in the resources excluding the first RU and the first MRU among the already set frequency bands. When the PPDU is a UL OFDMA PPDU, the transmitting STA becomes a STA that operates only in the 20 MHz band, the transmitting STA receives a trigger frame from a receiving STA (here, an AP), and the transmitting STA can transmit an EHT TB (Trigger Based) PPDU to the receiving STA. At this time, the EHT TB PPDU is transmitted in the resources excluding the first RU and the first MRU among the already set frequency bands. The EHT MU PPDU may include an L-STF (Legacy-Short Training Field), an L-LTF (Legacy-Long Training Field), an L-SIG (Legacy-Signal), an RL-SIG (Repeated L-SIG), a U-SIG (Universal-Signal), an EHT-SIG, an EHT-STF, and EHT-LTFs data fields. The EHT TB PPDU is defined in a format excluding the EHT-SIG in the EHT MU PPDU.

[0320] Also, when the PPDU is a DL OFDMA PPDU, the 242-tone RUs included in the already set frequency band are selectively allocated. For example, when the PPDU is a DL OFDMA PPDU received via a 40 MHz band, the first RU can selectively include the first and second 242-tone RUs. That is, the transmitting STA can selectively allocate the first and second 242-tone RUs to the receiving STA. When the first RU includes only the first 242-tone RU and does not include the second 242-tone RU, the receiving STA can receive the DL OFDMA PPDU via the second 242-tone RU (when the receiving STA has the capability for the second 242-tone RU). The same applies when the already set frequency band is an 80 MHz, 160 MHz, or 320 MHz band.

[0321] 4. Device Configuration

[0322] The technical features of this specification described above can be applied to various devices and methods. For example, the technical features of this specification described above are executed / supported via the devices in FIGS. 1 and / or 11. For example, the technical features of this specification described above are applied only to a part of FIGS. 1 and / or 11. For example, the technical features of this specification described above are implemented based on the processing chips 114 and 124 in FIG. 1, or based on the processors 111 and 121 and memories 112 and 122 in FIG. 1, or based on the processor 610 and memory 620 in FIG. 11. For example, the device in this specification receives a PPDU (Physical Protocol Data Unit) from a transmitting STA via an already set frequency band; and decodes the PPDU.

[0323] The technical features of this specification are implemented based on a CRM (computer readable medium). For example, the CRM proposed by this specification is at least one computer readable recording medium containing instructions based on being executed by at least one processor.

[0324] The CRM can store instructions for executing operations including the step of receiving a PPDU (Physical Protocol Data Unit) from a transmitting STA (station) via a pre-set frequency band; and the step of decoding the PPDU. The instructions stored in the CRM of this specification are executed by at least one processor. At least one processor related to the CRM of this specification can be the processor 111, 121 or the processing chips 114, 124 in FIG. 1, or the processor 610 in FIG. 11. On the other hand, the CRM of this specification can be the memories 112, 122 in FIG. 1 or the memory 620 in FIG. 11, or a separate external memory / storage medium / disk, etc.

[0325] The above-mentioned technical features of this specification are applicable to various applications and business models. For example, the above-mentioned technical features are applied for wireless communication in a device supporting artificial intelligence (Artificial Intelligence: AI).

[0326] Artificial intelligence means the field of studying artificial intelligence or the methodology for creating it, and machine learning means the field of studying the methodologies for defining and solving various problems dealt with in the field of artificial intelligence. Machine learning can also be defined as an algorithm that enhances the performance of a certain task through continuous experience with that task.

[0327] An artificial neural network (ANN) is a model used in machine learning. It refers to a general model with problem-solving capabilities, composed of artificial neurons (nodes) that form a network through synaptic connections. An artificial neural network is defined by the connection pattern between neurons in other layers, the learning process for updating model parameters, and the activation function that generates output values.

[0328] An artificial neural network can include an input layer, an output layer, and optionally one or more hidden layers. Each layer contains one or more neurons, and an artificial neural network can include synapses that connect neurons to neurons. In an artificial neural network, each neuron can output the function value of the activation function with respect to the input signal, weight value, and bias input through the synapse.

[0329] Model parameters refer to parameters determined through learning, including the weight values of synaptic connections and the biases of neurons. Hyperparameters refer to parameters that need to be set before learning in a machine learning algorithm, including the learning rate, number of iterations, mini-batch size, initialization function, etc.

[0330] The purpose of learning an artificial neural network is to determine model parameters that minimize the loss function. The loss function is used as an indicator for determining the optimal model parameters in the learning process of an artificial neural network.

[0331] Machine learning can be classified into supervised learning, unsupervised learning, and reinforcement learning according to the learning method.

[0332] Supervised learning means a method of training an artificial neural network with labels for training data. When the training data with labels is input into the artificial neural network, it means the correct answer (or result value) that the artificial neural network needs to infer. Unsupervised learning means a method of training an artificial neural network without labels for training data. Reinforcement learning means a learning method that trains an agent defined in an environment to select actions or action sequences that maximize cumulative rewards in each state.

[0333] Among artificial neural networks, machine learning implemented as a deep neural network (DNN) with multiple hidden layers is also called deep learning. Deep learning is part of machine learning. Hereinafter, machine learning is used to mean including deep learning.

[0334] Also, the above-described technical features are applied to wireless communication of robots.

[0335] A robot means a machine that automatically processes or operates a job given by its own possessed capabilities. In particular, a robot having a function of recognizing the environment, making its own judgment, and executing an operation is called an intelligent robot.

[0336] Robots can be classified into industrial, medical, household, military, etc. according to their usage purposes and fields. A robot is equipped with a drive unit including an actuator or a motor and can perform various physical actions such as moving robot joints. Also, a movable robot includes wheels, brakes, propellers, etc. in the drive unit and can travel on the ground or fly in the air through the drive unit.

[0337] Also, the above-described technical features are applied to devices that support augmented reality.

[0338] Extended reality is a general term for virtual reality (VR), augmented reality (AR), and mixed reality (MR). VR technology only provides objects and backgrounds in the real world as CG images. AR technology provides both real object images and CG images created virtually on top of them. MR technology is a computer graphics technology that mixes and combines virtual objects with the real world.

[0339] MR technology is similar to AR technology in that it shows virtual objects together. However, there is a difference in that in AR technology, virtual objects are used in a complementary form to virtual objects, while in MR technology, virtual objects are used with the same nature as virtual objects.

[0340] XR technology is applicable to head-mounted displays (HMDs), head-up displays (HUDs), mobile phones, tablets, laptops, desktops, TVs, digital signage, etc. Devices to which XR technology is applied can be referred to as XR devices.

[0341] The claims described in this specification can be combined in various ways. For example, the technical features of the method claims in this specification can be combined and implemented in a device, and the technical features of the device claims in this specification can be combined and implemented as a method. Also, the technical features of the method claims in this specification and the technical features of the device claims can be combined and implemented in a device, and the technical features of the method claims in this specification and the technical features of the device claims can be combined and implemented as a method.

Claims

1. In a method in a wireless LAN system, a receiving STA (station) receives a PPDU (Physical Protocol Data Unit) from a transmitting STA via a frequency band; the receiving STA decodes the PPDU, the receiving STA is a STA operating in a 20 MHz band, the PPDU includes a preamble and a data field, the data field of the receiving STA does not support a first RU (Resource Unit) and a first MRU (Multiple RUs) in the frequency band, based on the frequency band being a 40 MHz band, in the case of only 26-tone RUs, the 40 MHz band includes the first to the eighteenth 26-tone RUs; in the case of only 52-tone RUs, the 40 MHz band includes the first to the eighth 52-tone RUs; in the case of only 106-tone RUs, the 40 MHz band includes the first to the fourth 106-tone RUs; in the case of only 242-tone RUs, the 40 MHz band includes the first and the second 242-tone RUs, the first RU includes the fifth and fourteenth 26-tone RUs and the first and second 242-tone RUs, the first MRU includes an MRU in which the fifth 26-tone RU and the second 52-tone RU are aggregated, an MRU in which the fourteenth 26-tone RU and the sixth 52-tone RU are aggregated, an MRU in which the fifth 26-tone RU and the first 106-tone RU are aggregated, an MRU in which the fifth 26-tone RU and the second 106-tone RU are aggregated, an MRU in which the fourteenth 26-tone RU and the third 106-tone RU are aggregated, and an MRU in which the fourteenth 26-tone RU and the fourth 106-tone RU are aggregated, and a RU or MRU tone mapping for the 20 MHz band is not aligned with a RU or MRU tone mapping for the 40 MHz band, 80 MHz band, 160 MHz band, or 320 MHz band.

2. The first to the eighteenth 26-tone RUs are arranged in ascending order of frequency from the 26-tone RU with the lowest frequency to the 26-tone RU with the highest frequency, The first to the eighth 52-tone RUs are arranged in ascending order of frequency from the 52-tone RU with the lowest frequency to the 52-tone RU with the highest frequency, The first to fourth 106-tone RUs are arranged in the order of 106-tone RUs with lower frequencies to 106-tone RUs with higher frequencies. The first and second 242-tone RUs are arranged in the order of 242-tone RUs with lower frequencies to 242-tone RUs with higher frequencies, the method according to claim 1. **Claim 3** Based on the fact that the frequency band is the 80 MHz band, in the case of only 26-tone RUs, the 80 MHz band includes the first to 36th 26-tone RUs; in the case of only 52-tone RUs, the 80 MHz band includes the first to 16th 52-tone RUs; in the case of only 106-tone RUs, the 80 MHz band includes the first to 8th 106-tone RUs; in the case of only 242-tone RUs, the 80 MHz band includes the first to 4th 242-tone RUs. The first RU includes the 5th, 14th, 23rd, and 32nd 26-tone RUs and the first to 4th 242-tone RUs. The first MRU includes MRUs in which the 5th 26-tone RU and the 2nd 52-tone RU are aggregated, MRUs in which the 14th 26-tone RU and the 6th 52-tone RU are aggregated, MRUs in which the 23rd 26-tone RU and the 10th 52-tone RU are aggregated, MRUs in which the 32nd 26-tone RU and the 14th 52-tone RU are aggregated, MRUs in which the 5th 26-tone RU and the 1st 106-tone RU are aggregated, MRUs in which the 14th 26-tone RU and the 4th 106-tone RU are aggregated, MRUs in which the 23rd 26-tone RU and the 5th 106-tone RU are aggregated, and MRUs in which the 32nd 26-tone RU and the 8th 106-tone RU are aggregated, the method according to claim 1. **Claim 4** The first to 36th 26-tone RUs are arranged in the order of 26-tone RUs with lower frequencies to 26-tone RUs with higher frequencies. The first to 16th 52-tone RUs are arranged in the order of 52-tone RUs with lower frequencies to 52-tone RUs with higher frequencies. The first to 8th 106-tone RUs are arranged in the order of 106-tone RUs with lower frequencies to 106-tone RUs with higher frequencies. The first to 4th 242-tone RUs are arranged in the order of 242-tone RUs with lower frequencies to 242-tone RUs with higher frequencies, the method according to claim 3. **Claim 5** Based on the frequency band being the 160 MHz band including the first and second 80 MHz sub-channels, In the case of only 26-tone RUs, the first 80 MHz sub-channel includes the 26-tone RUs from the first to the 36th; in the case of only 52-tone RUs, the first 80 MHz sub-channel includes the 52-tone RUs from the first to the 16th; in the case of only 106-tone RUs, the first 80 MHz sub-channel includes the 106-tone RUs from the first to the 8th; in the case of only 242-tone RUs, the first 80 MHz sub-channel includes the 242-tone RUs from the first to the 4th, In the case of only 26-tone RUs, the second 80 MHz sub-channel includes the 26-tone RUs from the 37th to the 72nd; in the case of only 52-tone RUs, the second 80 MHz sub-channel includes the 52-tone RUs from the 17th to the 32nd; in the case of only 106-tone RUs, the second 80 MHz sub-channel includes the 106-tone RUs from the 9th to the 16th; in the case of only 242-tone RUs, the second 80 MHz sub-channel includes the 242-tone RUs from the 5th to the 8th, the method according to claim 1.

6. The first RU includes the 26-tone RUs of the 5th, 14th, 23rd, 32nd, 41st, 50th, 59th, and 68th, and the 242-tone RUs from the first to the 8th, The first MRU is, The MRU in which the 5th 26-tone RU and the 2nd 52-tone RU are aggregated, the MRU in which the 14th 26-tone RU and the 6th 52-tone RU are aggregated, the MRU in which the 23rd 26-tone RU and the 10th 52-tone RU are aggregated, the MRU in which the 32nd 26-tone RU and the 14th 52-tone RU are aggregated, The MRU in which the 41st 26-tone RU and the 18th 52-tone RU are aggregated, the MRU in which the 50th 26-tone RU and the 22nd 52-tone RU are aggregated, the MRU in which the 59th 26-tone RU and the 26th 52-tone RU are aggregated, the MRU in which the 68th 26-tone RU and the 30th 52-tone RU are aggregated, The MRU in which the fifth 26-tone RU and the first 106-tone RU are aggregated, the MRU in which the fourteenth 26-tone RU and the fourth 106-tone RU are aggregated, the MRU in which the twenty-third 26-tone RU and the fifth 106-tone RU are aggregated, the MRU in which the thirty-second 26-tone RU and the eighth 106-tone RU are aggregated, The method according to claim 5, comprising the MRU in which the forty-first 26-tone RU and the ninth 106-tone RU are aggregated, the MRU in which the fiftieth 26-tone RU and the twelfth 106-tone RU are aggregated, the MRU in which the fifty-ninth 26-tone RU and the thirteenth 106-tone RU are aggregated, and the MRU in which the sixty-eighth 26-tone RU and the sixteenth 106-tone RU are aggregated.

7. The first to seventy-second 26-tone RUs are arranged in the order of 26-tone RUs with lower frequencies to 26-tone RUs with higher frequencies, The first to thirty-sixth 52-tone RUs are arranged in the order of 52-tone RUs with lower frequencies to 52-tone RUs with higher frequencies, The first to sixteenth 106-tone RUs are arranged in the order of 106-tone RUs with lower frequencies to 106-tone RUs with higher frequencies, The method according to claim 6, wherein the first to eighth 242-tone RUs are arranged in the order of 242-tone RUs with lower frequencies to 242-tone RUs with higher frequencies.

8. When the frequency band is the 320 MHz band including the first to fourth 80 MHz subchannels, In the case of only 26-tone RUs, the first 80 MHz subchannel includes the first to thirty-sixth 26-tone RUs; in the case of only 52-tone RUs, the first 80 MHz subchannel includes the first to sixteenth 52-tone RUs; in the case of only 106-tone RUs, the first 80 MHz subchannel includes the first to eighth 106-tone RUs; in the case of only 242-tone RUs, the first 80 MHz subchannel includes the first to fourth 242-tone RUs. In the case of only 26-tone RUs, the second 80-MHz subchannel includes 26-tone RUs from the 37th to the 72nd; in the case of only 52-tone RUs, the second 80-MHz subchannel includes 52-tone RUs from the 17th to the 32nd; in the case of only 106-tone RUs, the second 80-MHz subchannel includes 106-tone RUs from the 9th to the 16th; in the case of only 242-tone RUs, the second 80-MHz subchannel includes 242-tone RUs from the 5th to the 8th. In the case of only 26-tone RUs, the third 80-MHz subchannel includes 26-tone RUs from the 73rd to the 108th; in the case of only 52-tone RUs, the third 80-MHz subchannel includes 52-tone RUs from the 33rd to the 48th; in the case of only 106-tone RUs, the third 80-MHz subchannel includes 106-tone RUs from the 17th to the 24th; in the case of only 242-tone RUs, the third 80-MHz subchannel includes 242-tone RUs from the 9th to the 12th. In the case of only 26-tone RUs, the fourth 80-MHz subchannel includes 26-tone RUs from the 109th to the 144th; in the case of only 52-tone RUs, the fourth 80-MHz subchannel includes 52-tone RUs from the 49th to the 64th; in the case of only 106-tone RUs, the fourth 80-MHz subchannel includes 106-tone RUs from the 25th to the 32nd; in the case of only 242-tone RUs, the fourth 80-MHz subchannel includes 242-tone RUs from the 13th to the 16th, the method according to claim 1.

9. The first RU includes 26-tone RUs of the 5th, 14th, 23rd, 32nd, 41st, 50th, 59th, 68th, 77th, 86th, 95th, 104th, 113th, 122nd, 131st, and 140th and 242-tone RUs from the 1st to the 16th. The first MRU is the MRU in which the 5th 26-tone RU and the 2nd 52-tone RU are aggregated, the MRU in which the 14th 26-tone RU and the 6th 52-tone RU are aggregated, the MRU in which the 23rd 26-tone RU and the 10th 52-tone RU are aggregated, the MRU in which the 32nd 26-tone RU and the 14th 52-tone RU are aggregated. The MRU in which the 41st 26-tone RU and the 18th 52-tone RU are aggregated, the MRU in which the 50th 26-tone RU and the 22nd 52-tone RU are aggregated, the MRU in which the 59th 26-tone RU and the 26th 52-tone RU are aggregated, the MRU in which the 68th 26-tone RU and the 30th 52-tone RU are aggregated, The MRU in which the 77th 26-tone RU and the 34th 52-tone RU are aggregated, the MRU in which the 86th 26-tone RU and the 38th 52-tone RU are aggregated, the MRU in which the 95th 26-tone RU and the 42nd 52-tone RU are aggregated, the MRU in which the 104th 26-tone RU and the 46th 52-tone RU are aggregated, The MRU in which the 113th 26-tone RU and the 50th 52-tone RU are aggregated, the MRU in which the 122nd 26-tone RU and the 54th 52-tone RU are aggregated, the MRU in which the 131st 26-tone RU and the 58th 52-tone RU are aggregated, the MRU in which the 140th 26-tone RU and the 62nd 52-tone RU are aggregated, The MRU in which the 5th 26-tone RU and the 1st 106-tone RU are aggregated, the MRU in which the 14th 26-tone RU and the 4th 106-tone RU are aggregated, the MRU in which the 23rd 26-tone RU and the 5th 106-tone RU are aggregated, the MRU in which the 32nd 26-tone RU and the 8th 106-tone RU are aggregated, The MRU in which the 41st 26-tone RU and the 9th 106-tone RU are aggregated, the MRU in which the 50th 26-tone RU and the 12th 106-tone RU are aggregated, the MRU in which the 59th 26-tone RU and the 13th 106-tone RU are aggregated, the MRU in which the 68th 26-tone RU and the 16th 106-tone RU are aggregated, The MRU in which the 77th 26-tone RU and the 17th 106-tone RU are aggregated, the MRU in which the 86th 26-tone RU and the 20th 106-tone RU are aggregated, the MRU in which the 95th 26-tone RU and the 21st 106-tone RU are aggregated, the MRU in which the 104th 26-tone RU and the 24th 106-tone RU are aggregated, The method according to claim 8, comprising an MRU in which the 26-tone RU of the 113th and the 106-tone RU of the 25th are aggregated, an MRU in which the 26-tone RU of the 122nd and the 106-tone RU of the 28th are aggregated, an MRU in which the 26-tone RU of the 131st and the 106-tone RU of the 29th are aggregated, and an MRU in which the 26-tone RU of the 140th and the 106-tone RU of the 32nd are aggregated.

10. The 26-tone RUs from the 1st to the 144th are arranged in the order of the 26-tone RUs with lower frequencies to the 26-tone RUs with higher frequencies. The 52-tone RUs from the 1st to the 64th are arranged in the order of the 52-tone RUs with lower frequencies to the 52-tone RUs with higher frequencies. The 106-tone RUs from the 1st to the 32nd are arranged in the order of the 106-tone RUs with lower frequencies to the 106-tone RUs with higher frequencies. The method according to claim 9, wherein the 242-tone RUs from the 1st to the 16th are arranged in the order of the 242-tone RUs with lower frequencies to the 242-tone RUs with higher frequencies.

11. Based on the PPDU being a DL (Downlink) OFDMA (Orthogonal Frequency Division Multiple Access) PPDU, the PPDU is an EHT (Extremely High Throughput) MU (Multi User) PPDU, and the EHT MU PPDU is decoded by the receiving STA and not allocated to the first RU and the first MRU in the frequency band. Based on the PPDU being a UL (Uplink) OFDMA PPDU, the PPDU is an EHT TB (Trigger Based) PPDU, and the EHT TB PPDU is transmitted by the transmitting STA in the resources excluding the first RU and the first MRU in the frequency band, and the transmitting STA is a STA operating in a 20 MHz band. The method according to claim 1.

12. In a receiving STA (station) in a wireless LAN system. A memory. A transceiver. A processor coupled to be operable with the memory and the transceiver, and the processor Receives a PPDU (Physical Protocol Data Unit) from a transmitting STA via a frequency band. Is configured to decode the PPDU. The receiving STA is a STA operating in a 20 MHz band, the PPDU includes a preamble and a data field, the data field of the receiving STA does not support a first RU (Resource Unit) and a first MRU (Multiple RUs) in the frequency band, based on the frequency band being a 40 MHz band, in the case of only 26-tone RUs, the 40 MHz band includes 26-tone RUs from the first to the eighteenth; in the case of only 52-tone RUs, the 40 MHz band includes 52-tone RUs from the first to the eighth; in the case of only 106-tone RUs, the 40 MHz band includes 106-tone RUs from the first to the fourth; in the case of only 242-tone RUs, the 40 MHz band includes 242-tone RUs of the first and the second, the first RU includes the fifth and fourteenth 26-tone RUs and the first and second 242-tone RUs, the first MRU includes an MRU in which the fifth 26-tone RU and the second 52-tone RU are aggregated, an MRU in which the fourteenth 26-tone RU and the sixth 52-tone RU are aggregated, an MRU in which the fifth 26-tone RU and the first 106-tone RU are aggregated, an MRU in which the fifth 26-tone RU and the second 106-tone RU are aggregated, an MRU in which the fourteenth 26-tone RU and the third 106-tone RU are aggregated, and an MRU in which the fourteenth 26-tone RU and the fourth 106-tone RU are aggregated, and the RU or MRU tone mapping for the 20 MHz band is not aligned with the RU or MRU tone mapping for the 40 MHz band, 80 MHz band, 160 MHz band, or 320 MHz band, the receiving STA.

13. In a method in a wireless LAN system, a step of a transmitting STA (station) generating a PPDU (Physical Protocol Data Unit), a step of the transmitting STA transmitting the PPDU to a receiving STA via a frequency band, including, the receiving STA is a STA operating in a 20 MHz band, the PPDU includes a preamble and a data field, The data field of the receiving STA does not support the first RU (Resource Unit) and the first MRU (Multiple RUs) in the frequency band. Based on the fact that the frequency band is a 40 MHz band, in the case of only 26-tone RUs, the 40 MHz band includes the first to the 18th 26-tone RUs; in the case of only 52-tone RUs, the 40 MHz band includes the first to the 8th 52-tone RUs; in the case of only 106-tone RUs, the 40 MHz band includes the first to the 4th 106-tone RUs; in the case of only 242-tone RUs, the 40 MHz band includes the first and the second 242-tone RUs. The first RU includes the 5th and 14th 26-tone RUs and the first and second 242-tone RUs. The first MRU includes the MRU in which the 5th 26-tone RU and the 2nd 52-tone RU are aggregated, the MRU in which the 14th 26-tone RU and the 6th 52-tone RU are aggregated, the MRU in which the 5th 26-tone RU and the 1st 106-tone RU are aggregated, the MRU in which the 5th 26-tone RU and the 2nd 106-tone RU are aggregated, the MRU in which the 14th 26-tone RU and the 3rd 106-tone RU are aggregated, and the MRU in which the 14th 26-tone RU and the 4th 106-tone RU are aggregated, and A method in which the RU or MRU tone mapping for the 20 MHz band is not aligned with the RU or MRU tone mapping for the 40 MHz band, 80 MHz band, 160 MHz band, or 320 MHz band.

14. The first to the 18th 26-tone RUs are arranged in ascending order of 26-tone RUs with lower frequencies to 26-tone RUs with higher frequencies. The first to the 8th 52-tone RUs are arranged in ascending order of 52-tone RUs with lower frequencies to 52-tone RUs with higher frequencies. The first to the 4th 106-tone RUs are arranged in ascending order of 106-tone RUs with lower frequencies to 106-tone RUs with higher frequencies. The method according to claim 13, wherein the first and second 242-tone RUs are arranged in ascending order of 242-tone RUs with lower frequencies to 242-tone RUs with higher frequencies.

15. Based on the fact that the frequency band is the 80 MHz band, in the case of only 26-tone RUs, the 80 MHz band includes the 26-tone RUs from the first to the 36th; in the case of only 52-tone RUs, the 80 MHz band includes the 52-tone RUs from the first to the 16th; in the case of only 106-tone RUs, the 80 MHz band includes the 106-tone RUs from the first to the 8th; in the case of only 242-tone RUs, the 80 MHz band includes the 242-tone RUs from the first to the 4th. The first RU includes the 5th, 14th, 23rd, and 32nd 26-tone RUs and the 242-tone RUs from the first to the 4th. The method according to claim 13, wherein the first MRU includes an MRU in which the 5th 26-tone RU and the 2nd 52-tone RU are aggregated, an MRU in which the 14th 26-tone RU and the 6th 52-tone RU are aggregated, an MRU in which the 23rd 26-tone RU and the 10th 52-tone RU are aggregated, an MRU in which the 32nd 26-tone RU and the 14th 52-tone RU are aggregated, an MRU in which the 5th 26-tone RU and the 1st 106-tone RU are aggregated, an MRU in which the 14th 26-tone RU and the 4th 106-tone RU are aggregated, an MRU in which the 23rd 26-tone RU and the 5th 106-tone RU are aggregated, and an MRU in which the 32nd 26-tone RU and the 8th 106-tone RU are aggregated.

16. The 26-tone RUs from the first to the 36th are arranged in ascending order of the 26-tone RUs with lower frequencies to the 26-tone RUs with higher frequencies. The 52-tone RUs from the first to the 16th are arranged in ascending order of the 52-tone RUs with lower frequencies to the 52-tone RUs with higher frequencies. The 106-tone RUs from the first to the 8th are arranged in ascending order of the 106-tone RUs with lower frequencies to the 106-tone RUs with higher frequencies. The method according to claim 15, wherein the 242-tone RUs from the first to the 4th are arranged in ascending order of the 242-tone RUs with lower frequencies to the 242-tone RUs with higher frequencies.

17. Based on the fact that the frequency band is the 160 MHz band including the first and second 80 MHz subchannels. In the case of only 26-tone RUs, the first 80 MHz subchannel includes the 26-tone RUs from the first to the 36th; in the case of only 52-tone RUs, the first 80 MHz subchannel includes the 52-tone RUs from the first to the 16th; in the case of only 106-tone RUs, the first 80 MHz subchannel includes the 106-tone RUs from the first to the 8th; in the case of only 242-tone RUs, the first 80 MHz subchannel includes the 242-tone RUs from the first to the 4th. In the case of only 26-tone RUs, the second 80 MHz subchannel includes the 26-tone RUs from the 37th to the 72nd; in the case of only 52-tone RUs, the second 80 MHz subchannel includes the 52-tone RUs from the 17th to the 32nd; in the case of only 106-tone RUs, the second 80 MHz subchannel includes the 106-tone RUs from the 9th to the 16th; in the case of only 242-tone RUs, the second 80 MHz subchannel includes the 242-tone RUs from the 5th to the 8th. The first RU includes the 26-tone RUs of the 5th, 14th, 23rd, 32nd, 41st, 50th, 59th, and 68th, and the 242-tone RUs from the first to the 8th. The first MRU is the MRU formed by aggregating the 5th 26-tone RU and the 2nd 52-tone RU, the MRU formed by aggregating the 14th 26-tone RU and the 6th 52-tone RU, the MRU formed by aggregating the 23rd 26-tone RU and the 10th 52-tone RU, the MRU formed by aggregating the 32nd 26-tone RU and the 14th 52-tone RU, the MRU formed by aggregating the 41st 26-tone RU and the 18th 52-tone RU, the MRU formed by aggregating the 50th 26-tone RU and the 22nd 52-tone RU, the MRU formed by aggregating the 59th 26-tone RU and the 26th 52-tone RU, the MRU formed by aggregating the 68th 26-tone RU and the 30th 52-tone RU, the MRU formed by aggregating the 5th 26-tone RU and the 1st 106-tone RU, the MRU formed by aggregating the 14th 26-tone RU and the 4th 106-tone RU, the MRU formed by aggregating the 23rd 26-tone RU and the 5th 106-tone RU, the MRU formed by aggregating the 32nd 26-tone RU and the 8th 106-tone RU. The method according to claim 13, comprising an MRU in which the 41st 26-tone RU and the 9th 106-tone RU are aggregated, an MRU in which the 50th 26-tone RU and the 12th 106-tone RU are aggregated, an MRU in which the 59th 26-tone RU and the 13th 106-tone RU are aggregated, and an MRU in which the 68th 26-tone RU and the 16th 106-tone RU are aggregated.

18. In a transmitting STA (station) in a wireless LAN system, a memory, a transceiver, a processor coupled to be operable with the memory and the transceiver, wherein the processor generates a PPDU (Physical Protocol Data Unit), is configured to transmit the PPDU to a receiving STA via a frequency band, the receiving STA is a STA operating in a 20 MHz band, the PPDU includes a preamble and a data field, the data field of the receiving STA does not support a first RU (Resource Unit) and a first MRU (Multiple RUs) in the frequency band, based on the frequency band being a 40 MHz band, in the case of only 26-tone RUs, the 40 MHz band includes the 1st to 18th 26-tone RUs; in the case of only 52-tone RUs, the 40 MHz band includes the 1st to 8th 52-tone RUs; in the case of only 106-tone RUs, the 40 MHz band includes the 1st to 4th 106-tone RUs; in the case of only 242-tone RUs, the 40 MHz band includes the 1st and 2nd 242-tone RUs, the first RU includes the 5th and 14th 26-tone RUs and the 1st and 2nd 242-tone RUs, the first MRU includes an MRU in which the 5th 26-tone RU and the 2nd 52-tone RU are aggregated, an MRU in which the 14th 26-tone RU and the 6th 52-tone RU are aggregated, an MRU in which the 5th 26-tone RU and the 1st 106-tone RU are aggregated, an MRU in which the 5th 26-tone RU and the 2nd 106-tone RU are aggregated, an MRU in which the 14th 26-tone RU and the 3rd 106-tone RU are aggregated, and an MRU in which the 14th 26-tone RU and the 4th 106-tone RU are aggregated, and A transmitting STA in which RU or MRU tone mapping for the 20 MHz band is not aligned with RU or MRU tone mapping for the 40 MHz band, 80 MHz band, 160 MHz band, or 320 MHz band.

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