Configuration of Data Unit for Copy Transmission

Abstract

To propose a technical feature for increasing a transmission range of a wireless LAN signal.SOLUTION: A wireless LAN signal of the present specification, e.g. a transmission physical protocol data unit (PPDU), may be configured on the basis of a duplicate transmission mode. The transmission PPDU of the present specification may comprise a data unit duplicated in frequency. The data unit duplicated in frequency may be configured on the basis of a total bandwidth of the transmission PPDU. The transmission PPDU of the present specification proposes various training fields for the duplicated data unit.SELECTED DRAWING: Figure 25

Description

Technical Field

[0001] This specification relates to a wireless LAN system, and more specifically, to the configuration of data units for duplicate transmission.

Background Art

[0002] WLAN (wireless local area network) has been improved in various ways. For example, the IEEE 802.11ax standard proposed an improved communication environment using OFDMA (orthogonal frequency division multiple access) and DL MU MIMO (downlink multi-user multiple input, multiple output) techniques.

[0003] This specification proposes technical features that can be utilized in new communication standards. For example, the new communication standard can be the EHT (Extreme high throughput) standard that is currently under discussion. The EHT standard can use newly proposed increased bandwidth, improved PPDU (PHY layer protocol data unit) structure, improved sequence, HARQ (Hybrid automatic repeat request) techniques, etc. The EHT standard can be referred to as the IEEE 802.11be standard.

[0004] The EHT standard can use a wide bandwidth (e.g., 160 / 320 MHz), 16 streams, and / or multi-link (or multi-band) operation, etc. to support high throughput and high data rate.

[0005] In the EHT specification, a wide bandwidth (e.g., 160 / 240 / 320 MHz) can be used for high throughput. Also, preamble puncturing and multiple RU transmission can be used to efficiently utilize the bandwidth.

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the new wireless LAN standard, various technical features are being discussed to extend signal transmission. This specification proposes various technical features to extend the transmission range of wireless LAN signals.

Means for Solving the Problems

[0007] The technical features of this specification are related to the technical features executed by a STA (Station) of a wireless local area network. The STA based on this specification constructs a transmitted PPDU (physical protocol data unit) based on the duplicate transmission mode.

[0008] For example, the transmitted PPDU includes a first control signal field for interpreting the transmitted PPDU, an STF (short training field), an LTF (long training field), and a data field.

[0009] For example, the first control signal field includes a type field including a type value related to the duplicate transmission mode.

[0010] For example, the data field includes a first data RU including tones for half of the total bandwidth of the transmission PPDU and a second data RU in which the first data RU is duplicated in frequency.

[0011] For example, the STF is configured based on an STF sequence preset for the total bandwidth.

[0012] For example, the LTF is configured based on an LTF sequence preset for the total bandwidth.

Advantages of the Invention

[0013] The technical features in this specification can extend the transmission range of a wireless LAN signal (e.g., PPDU). For example, when the transmission power is limited in a specific band (e.g., 6 GHz band), the technical features in this specification can be applied to the signal transmitted in that band. Thereby, signals can be stably transmitted and received even in a band where the transmission power is limited.

Brief Description of the Drawings

[0014]

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Mode for Carrying Out the Invention

[0015] In this specification, "A or B" can mean "only A", "only B", or "both A and B". In other words, 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".

[0016] The slashes ( / ) and commas used in this specification can mean "and / or". For example, "A / B" can mean "A and / or B". Thus, "A / B" can mean "only A", "only B", or "both A and B". For example, "A, B, C" can mean "A, B, or C".

[0017] 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".

[0018] 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".

[0019] Also, the parentheses used in this specification can mean "for example". Specifically, when it is shown as "control information (EHT-Signal)", it is possible that "EHT-Signal" is proposed as an example of "control information". In other words, "control information" in this specification is not limited to "EHT-Signal", and it is possible that "EHT-Signal" is proposed as an example of "control information". Also, when it is shown as "control information (i.e., EHT-signal)", it is possible that "EHT-signal" is proposed as an example of "control information".

[0020] The technical features separately described within one drawing in this specification can be realized separately or simultaneously.

[0021] The following example of this specification can be applied to various wireless communication systems. For example, the following example of this specification can be applied to a wireless local area network (WLAN) system. For example, this specification can be applied to the IEEE 802.11a / g / n / ac standards and the IEEE 802.11ax standard. Also, this specification can be applied to the newly proposed EHT standard or the IEEE 802.11be standard. Further, an example of this specification can also be applied to a new wireless LAN standard that enhances the EHT standard or the IEEE 802.11be. Additionally, an example of this specification can be applied to a mobile communication system. For example, it can be applied to a mobile communication system based on LTE (Long Term Evolution) and its evolution based on the 3GPP (registered trademark) (3rd Generation Partnership Project) standard. Also, an example of this specification can be applied to a communication system of the 5G NR standard based on the 3GPP standard.

[0022] Hereinafter, in order to explain the technical features of this specification, the technical features to which this specification can be applied will be described.

[0023] FIG. 1 shows an example of a transmission device and / or a reception device of this specification.

[0024] 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 also be called 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 also be called 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 also be called various names such as a receiving device, a transmitting device, a receiving STA, a transmitting STA, a receiving Device, a transmitting Device, etc.

[0025] For example, the STA (110, 120) can play the role of an AP (Access Point) or play 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.

[0026] The STA (110, 120) in this specification can support various communication standards other than the IEEE 802.11 standard. For example, it can support communication standards according to the 3GPP standard (such as the LTE, LTE-A, 5G NR standards). Also, the STA in this specification can be implemented in various devices such as a mobile phone, a vehicle, a personal computer, etc. Also, the STA in this specification can support communication for various communication services such as voice calls, video calls, data communication, self-driving (Autonomous-Driving).

[0027] 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.

[0028] Describing the STA (110, 120) based on the sub - drawing (a) of FIG. 1 is as follows.

[0029] The first STA (110) can include a processor 111, a memory 112, and a transceiver 113. The illustrated processor, memory, and transceiver can be realized on separate chips respectively, or at least two or more blocks / functions can be realized via one chip.

[0030] The transceiver 113 of the first STA performs 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.).

[0031] For example, the first STA (110) can perform the intended operations of an AP. For example, the processor 111 of the AP can receive a signal via the transceiver 113, process the received signal, generate a transmission signal, and perform control for signal transmission. The memory 112 of the AP can store the signal received via the transceiver 113 (i.e., the received signal), and can store the signal transmitted via the transceiver (i.e., the transmission signal).

[0032] For example, the second STA (120) can perform the intended operations of a Non - AP STA. For example, the transceiver 123 of the non - AP performs signal transmission and reception operations. Specifically, it can transmit and receive IEEE 802.11 packets (for example, IEEE 802.11a / b / g / n / ac / ax / be, etc.).

[0033] For example, the processor 121 of the Non-AP STA can receive a signal via the transceiver 123, process the received signal, generate a transmission signal, and perform control for signal transmission. The memory 122 of the Non-AP STA can store the signal received via the transceiver 123 (i.e., the received signal), and can store the signal transmitted via the transceiver (i.e., the transmission signal).

[0034] For example, in the following specification, the operations of the device indicated as the AP can be performed by 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 the AP are controlled by the processor 111 of the first STA (110), and related signals can be 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 can be 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 the AP are controlled by the processor 121 of the second STA (120), and related signals can be 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 can be stored in the memory 122 of the second STA (110).

[0035] For example, in the following description, the operations of the devices displayed as non-AP (or User-STA) can be performed by the first STA (110) or the second STA (120). For example, when the second STA (120) is non-AP, the operations of the devices displayed as non-AP are controlled by the processor 121 of the second STA (120), and related signals can be 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 can be stored in the memory 122 of the second STA (120). For example, when the first STA (110) is non-AP, the operations of the devices displayed as non-AP are controlled by the processor 111 of the first STA (110), and related signals can be 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 can be stored in the memory 112 of the first STA (110).

[0036] In the following description, devices such as (transmitting / receiving) STA, the first STA, the second STA, STA1, STA2, AP, the first AP, the second AP, AP1, AP2, (transmitting / receiving) Terminal, (transmitting / receiving) device, (transmitting / receiving) apparatus, and network can mean the STA (110, 120) in FIG. 1. For example, devices shown as (transmitting / receiving) STA, the first STA, the second STA, STA1, STA2, AP, the first AP, the second AP, AP1, AP2, (transmitting / receiving) Terminal, (transmitting / receiving) device, (transmitting / receiving) apparatus, network, etc. without specific drawing symbols can also mean the STA (110, 120) in FIG. 1. For example, in the following example, the operation of various STAs transmitting and receiving signals (e.g., PPPDU) can be performed by the transceivers 113, 123 in FIG. 1. Also, in the following example, the operation of various STAs generating transmission and reception signals or performing data processing and calculations in advance for the transmission and reception signals can be performed by 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 calculations in advance for the transmission and reception signals includes: 1) the operation of determining / acquiring / configuring / calculating / 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 the 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 a specific sequence (e.g., pilot sequence, STF / LTF sequence, extra sequence applied to SIG) used for the sub-field (SIG, STF, LTF, Data) 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 / calculating / decoding / encoding of the ACK signal, 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 determination / acquisition / configuration / operation / decoding / encoding of transmission and reception signals can be stored in memories 112 and 122 of FIG. 1.

[0037] The device / STA in the sub-drawing (a) of FIG. 1 described above can be deformed as in the sub-drawing (b) of FIG. 1. Hereinafter, based on the sub-drawing (b) of FIG. 1, the STAs (110, 120) in this specification will be described.

[0038] For example, transceivers 113 and 123 shown in the sub-drawing (b) of FIG. 1 can perform the same functions as the transceivers shown in the sub-drawing (a) of FIG. 1 described above. For example, processing chips 114 and 124 shown in the sub-drawing (b) of FIG. 1 can include processors 111 and 121 and memories 112 and 122. Processors 111 and 121 and memories 112 and 122 shown in the sub-drawing (b) of FIG. 1 can perform the same functions as processors 111 and 121 and memories 112 and 122 shown in the sub-drawing (a) of FIG. 1 described above.

[0039] 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 can mean the STAs (110, 120) shown in the sub-drawings (a) / (b) of FIG. 1, or can mean the processing chips 114, 124 shown in the sub-drawing (b) of FIG. 1. That is, the technical features of this specification can be performed by the STAs (110, 120) shown in the sub-drawings (a) / (b) of FIG. 1, or can also be performed only by the processing chips 114, 124 shown in the sub-drawing (b) of FIG. 1. 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 by the processors 111, 121 shown in the sub-drawings (a) / (b) of FIG. 1 is transmitted via the transceivers 113, 123 shown in the sub-drawings (a) / (b) of FIG. 1. 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 by the processing chips 114, 124 shown in the sub-drawing (b) of FIG. 1 is generated.

[0040] 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 and 123 shown in the sub-drawing (a) of FIG. 1. 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 and 123 shown in the sub-drawing (a) of FIG. 1 is acquired by the processors 111 and 121 shown in the sub-drawing (a) of FIG. 1. 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 and 123 shown in the sub-drawing (b) of FIG. 1 is acquired by the processing chips 114 and 124 shown in the sub-drawing (b) of FIG. 1.

[0041] Referring to the sub-drawing (b) of FIG. 1, software codes 115 and 125 can be provided in the memories 112 and 122. The software codes 115 and 125 may include instructions for controlling the operations of the processors 111 and 121. The software codes 115 and 125 can be included in various programming languages.

[0042] 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 can be 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™ series processor manufactured by Qualcomm (registered trademark), an EXYNOS™ series processor manufactured by Samsung (registered trademark), an A series processor manufactured by Apple (registered trademark), a HELIO™ series processor manufactured by MediaTek (registered trademark), an ATOM™ series processor manufactured by INTEL (registered trademark), or a processor that enhances this.

[0043] In this specification, the uplink can mean a link for communication from a non-AP STA to an AP STA, and an uplink PPDU / packet / signal, etc. can be transmitted via the uplink. Also, in this specification, the downlink can mean a link for communication from an AP STA to a non-AP STA, and a downlink PPDU / packet / signal, etc. can be transmitted via the downlink.

[0044] FIG. 2 is a conceptual diagram showing the structure of a wireless LAN (WLAN).

[0045] The upper part of Figure 2 shows the structure of an IEEE (Institute of Electrical and Electronic Engineers) 802.11 infrastructure BSS (Basic Service Set).

[0046] Referring to the upper part of Figure 2, a wireless LAN system can include one or more infrastructure BSSs (200, 205) (hereinafter referred to as BSSs). A BSS (200, 205) is a set of APs (Access Points, 225) and STAs (Stations, 200-1) that can communicate with each other successfully after synchronization, and is not a concept referring to a specific area. BSS (205) can also include one or more connectable STAs (205-1, 205-2) to one AP (230).

[0047] 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.

[0048] The distribution system 210 can realize an ESS (Extended Service Set, 240), which is an extended service set formed by connecting several BSSs (200, 205). ESS (240) can be used as a term to indicate a network in which one or more APs are connected via the distribution system 210. The APs included in one ESS (240) can have the same SSID (Service Set Identification).

[0049] A portal (220) can play the role of a bridge for connecting a wireless LAN network (IEEE 802.11) and other networks (e.g., 802.X).

[0050] In a BSS such as the upper end of FIG. 2, a network between APs (225, 230) and a network between APs (225, 230) and STAs (200-1, 205-1, 205-2) can be realized. However, it may also be possible to set up a network and perform communication directly between STAs without the APs (225, 230). A network that sets up a network and performs communication directly between STAs without the APs (225, 230) is defined as an ad-hoc network or an independent basic service set (IBSS).

[0051] The lower end of FIG. 2 is a conceptual diagram showing an IBSS.

[0052] Referring to the lower end of FIG. 2, an IBSS is a BSS that operates in ad-hoc mode. Since an IBSS does not include an AP, there is no centralized management entity that performs 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) can be mobile STAs, connections to a distributed system are not allowed, and it forms a self-contained network.

[0053] FIG. 3 shows an example of a PPDU used in the IEEE standard.

[0054] As shown in the illustration, in standards such as IEEE a / g / n / ac, various forms of PPDUs (PHY protocol data units) are used. 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).

[0055] Figure 3 also includes an example of an HE PPDU in the IEEE 802.11ax standard. The HE PPDU according to Figure 3 is an example of a PPDU for multiple users. HE-SIG-B is only included in the case of multiple users, and the corresponding HE-SIG-B can be omitted from the PPDU for a single user.

[0056] 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 can be transmitted during the illustrated time interval (i.e., 4 or 8 μs, etc.).

[0057] Hereinafter, the resource unit (RU) used in the PPDU will be described. The resource unit can include a plurality of subcarriers (or, tones). The resource unit can be used when transmitting signals to a plurality of STAs based on the OFDMA technique. Also, when transmitting a signal to one STA, the resource unit can be defined. The resource unit can be used for an STF, an LTF, a data field, etc.

[0058] Figure 4 shows the arrangement of resource units (RUs) used on a 20 MHz band.

[0059] As shown in FIG. 4, resource units (RUs) corresponding to different numbers of tones (i.e., subcarriers) can be used to constitute a partial field of the HE-PPDU. For example, resources can be allocated in RU units as illustrated for the HE-STF, HE-LTF, and data fields.

[0060] As shown at the uppermost part of FIG. 4, 26-units (i.e., units corresponding to 26 tones) can be arranged. In the leftmost band of the 20 MHz band, 6 tones are used as a guard band, and in the rightmost band of the 20 MHz band, 5 tones can be used as a guard band. Also, in the central band, i.e., the DC band, 7 DC tones are inserted, and 26-units corresponding to 13 tones each can exist on the left and right sides of the DC band. Further, in other bands, 26-units, 52-units, and 106-units can be allocated. Each unit can be allocated for a receiving station, i.e., a user.

[0061] On the other hand, the RU arrangement in FIG. 4 is utilized not only for the situation of multiple users (MUs) but also for the situation of a single user (SU). In this case, as shown at the lowermost part of FIG. 4, it is possible to use 1 242-unit, and in this case, 3 DC tones can be inserted.

[0062] In an example of FIG. 4, RUs of various sizes, i.e., 26-RU, 52-RU, 106-RU, 242-RU, etc. have been proposed, and since the specific sizes of such RUs can be extended or increased, this embodiment is not limited to the specific size of each RU (i.e., the corresponding number of tones).

[0063] FIG. 5 shows the arrangement of resource units (RUs) used on a 40 MHz band.

[0064] Similar to the use of RUs of various sizes in an example of FIG. 4, in an example of FIG. 5, 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, etc. can also be used. Also, for the center frequency, 5 DC tones can be inserted. In the leftmost band of the 40 MHz band, 12 tones can be used as guard bands, and in the rightmost band of the 40 MHz band, 11 tones can be used as guard bands.

[0065] Also, as shown in the figure, when used for a single user, 484-RU can be used. On the other hand, the point that the specific number of RUs can be changed is the same as in the example of FIG. 4.

[0066] FIG. 6 shows the arrangement of resource units (RUs) used on the 80 MHz band.

[0067] Similar to the use of RUs of various sizes in an example of FIGS. 4 and 5, in an example of FIG. 6, 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, 996-RU, etc. can also be used. Also, for the center frequency, 7 DC tones can be inserted. In the leftmost band of the 80 MHz band, 12 tones can be used as guard bands, and in the rightmost band of the 80 MHz band, 11 tones can be used as guard bands. Also, 26-RU using 13 tones each located on the left and right of the DC band can be used.

[0068] Also, as shown in the figure, when used for a single user, 996-RU can be used, and in this case, 5 DC tones can be inserted.

[0069] The RU described in this specification can be used for UL (Uplink) communication and DL (Downlink) communication. For example, when UL-MU communication solicited by a Trigger frame is executed, the transmitting STA (e.g., AP) can allocate a first RU (e.g., 26 / 52 / 106 / 242-RU, etc.) to the first STA and a second RU (e.g., 26 / 52 / 106 / 242-RU, 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 in the same time interval.

[0070] 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 / 242-RU, etc.) to the first STA and a second RU (e.g., 26 / 52 / 106 / 242-RU, 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.

[0071] Information regarding the RU arrangement can be signaled via HE-SIG-B.

[0072] Figure 7 shows the structure of the HE-SIG-B field.

[0073] As shown, the HE-SIG-B field 710 includes a common field 720 and a user-specific field 730. The common field 720 can include information that is commonly applicable to all users who receive SIG-B (i.e., user STAs). The user-specific field 730 can be called a user-specific control field. When SIG-B is transmitted to multiple users, the user-specific field 730 can be applicable only to some of the multiple users.

[0074] As shown in FIG. 7, the common field 720 and the user-specific field 730 can be encoded separately.

[0075] The common field 720 can include N*8-bit RU allocation information. For example, the RU allocation information can include information regarding the location of the RU. For example, as shown in FIG. 4, when a 20 MHz channel is used, the RU allocation information can include information regarding which RUs (26-RU / 52-RU / 106-RU) are arranged in which frequency bands.

[0076] An example when the RU allocation information is composed of 8 bits is as follows.

[0077] [Table 1]

[0078] As in the example of FIG. 4, up to nine 26-RUs can be allocated to a 20 MHz channel. As shown in Table 1, when the RU allocation information in the common field 720 is set to "00000000", up to nine 26-RUs can be allocated to the corresponding channel (i.e., 20 MHz). Also, as shown in Table 1, when the RU allocation information in the common field 720 is set to "00000001", seven 26-RUs and one 52-RU are arranged in the corresponding channel. That is, in the example of FIG. 4, a 52-RU is allocated on the rightmost side, and seven 26-RUs can be allocated on the left side thereof.

[0079] An example of Table 1 shows only a part of the RU locations where the RU allocation information can be displayed.

[0080] For example, the RU allocation information can include an example of Table 2 below.

[0081]

Table 2

[0082] "01000y2y1y0" is related to an example where a 106-RU is allocated to the leftmost side of a 20 MHz channel and five 26-RUs are allocated to the right side thereof. In this case, multiple STAs (e.g., User-STAs) can be allocated to the 106-RU based on the MU-MIMO technique. Specifically, up to eight STAs (e.g., User-STAs) can be allocated to the 106-RU, and the number of STAs (e.g., User-STAs) allocated to the 106-RU 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 106-RU based on the MU-MIMO technique is N + 1.

[0083] Generally, for a plurality of RUs, a plurality of different STAs (e.g., User STAs) can be assigned to each other. However, for one RU with a specific size (e.g., 106 subcarriers) or more, a plurality of STAs (e.g., User STAs) can be assigned based on the MU-MIMO technique.

[0084] As shown in FIG. 7, the user - individual field 730 can include a plurality of user fields. As described above, the number of STAs (e.g., User STAs) assigned to a specific channel can be determined based on the RU allocation information in the common field 720. For example, when the RU allocation information in the common field 720 is "00000000", one User STA can be assigned to each of the 9 26 - RUs (i.e., a total of 9 User STAs can be assigned). That is, up to 9 User STAs can be assigned to a specific channel via the OFDMA technique. In other words, up to 9 User STAs can be assigned to a specific channel via the non - MU - MIMO technique.

[0085] For example, when the RU allocation is set to "01000y2y1y0", a plurality of User STAs are assigned to the 106 - RU arranged on the left - most side via the MU - MIMO technique, and 5 User STAs can be assigned to the 5 26 - RUs arranged on its right - hand side via the non - MU - MIMO technique. Such a case is embodied through an example in FIG. 8.

[0086] FIG. 8 shows an example in which a plurality of User STAs are assigned to the same RU via the MU - MIMO technique.

[0087] For example, as shown in FIG. 7, when the RU allocation is set to "01000010", based on Table 2, 106-RU can be allocated to the leftmost side of the specific channel, and five 26-RUs can be allocated to the right side thereof. Also, a total of three User STAs can be allocated to the 106-RU via the MU-MIMO technique. As a result, since a total of eight User STAs are allocated, the user-individual field 730 of HE-SIG-B can include eight User fields.

[0088] The eight User fields can be included in the order shown in FIG. 8. Also, as shown in FIG. 7, two User fields can be embodied in one User block field.

[0089] The User fields shown in FIGS. 7 and 8 can be configured based on two formats. That is, the User field related to the MU-MIMO technique can be configured in the first format, and the User field related to the non-MU-MIMO technique can be configured in the second format. Referring to an example in FIG. 8, User field 1 to User field 3 can be based on the first format, and User field 4 to User Field 8 can be based on the second format. The first format or the second format can include bit information of the same length (e.g., 21 bits).

[0090] Each User field can have the same size (e.g., 21 bits). For example, the User Field of the first format (the format of the MU-MIMO technique) can be configured as follows.

[0091] 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 corresponding 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. Specifically, an example of the second bit (i.e., B11 - B14) is as shown in Tables 3 to 4 below.

[0092]

Table 3

[0093]

Table 4

[0094] As shown in Table 3 and / or Table 4, the second bit (i.e., B11 - B14) can include information regarding the number of Spatial Streams assigned to a plurality of User STAs assigned by the MU - MIMO technique. For example, as shown in FIG. 8, when 3 User STAs are assigned to 106 - RU based on the MU - MIMO technique, N_user is set to "3", and thereby, as shown in Table 3, the values of N_STS[1], N_STS[2], and N_STS[3] can be determined. For example, when the value of the second bit (B11 - B14) is "0011", N_STS[1]=4, N_STS[2]=1, and N_STS[3]=1 can be set. That is, in an example of FIG. 8, 4 Spatial Streams can be assigned to User field1, 1 Spatial Stream can be assigned to User field2, and 1 Spatial Stream can be assigned to User field3.

[0095] As in an example of Table 3 and / or Table 4, information regarding the number of spatial streams for a user station (user STA) (i.e., the second bit, B11 - B14) can be composed of 4 bits. Also, information regarding the number of spatial streams for a user station (user STA) (i.e., the second bit, B11 - B14) can support up to 8 spatial streams. Further, information regarding the number of spatial streams (i.e., the second bit, B11 - B14) can support up to 4 spatial streams for one User STA.

[0096] Also, 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 corresponding SIG - B is included.

[0097] 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 represented by index 0 to index 11. The MCS information can include information regarding the 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.

[0098] Also, the fourth bit (i.e., B19) within the User field (i.e., 21 bits) is a Reserved field.

[0099] 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 corresponding SIG-B is included.

[0100] The above-mentioned example is related to the User Field of the first format (the format of the MU-MIMO technique). An example of the User field of the second format (the format of the non-MU-MIMO technique) is as follows.

[0101] 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 corresponding RU. Also, the 3rd bit (e.g., B14) within the User field of the second format can contain information regarding whether a beamforming 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).

[0102] Figure 9 shows the operation by UL-MU. As shown, the transmitting STA (e.g., AP) can execute channel connection via contending (i.e., Backoff operation) and transmit Trigger frame 930. That is, the transmitting STA (e.g., AP) can transmit a PPDU containing Trigger Frame 930. When a PPDU containing a Trigger frame is received, after a delay of SIFS, a TB (trigger-based) PPDU is transmitted.

[0103] TB PPDUs 941, 942 are transmitted in the same time slot and can be transmitted from a plurality of STAs (e.g., User STAs) whose AIDs are indicated in Trigger frame 930. The ACK frame 950 for the TB PPDU can be implemented in various forms.

[0104] Figure 10 shows an example of channels used / supported / defined within the 2.4 GHz band.

[0105] The 2.4 GHz band can be called by other names such as the first band. Also, the 2.4 GHz band can mean a frequency region where channels adjacent to a center frequency of 2.4 GHz (e.g., channels located within a center frequency of 2.4 to 2.5 GHz) are used / supported / defined.

[0106] The 2.4 GHz band can include a plurality of 20 MHz channels. The 20 MHz within the 2.4 GHz band can have a plurality of channel indexes (for example, index 1 to index 14). For example, the center frequency of the 20 MHz channel to which channel index 1 is assigned is 2.412 GHz, the center frequency of the 20 MHz channel to which channel index 2 is assigned is 2.417 GHz, and the center frequency of the 20 MHz channel to which channel index N is assigned is (2.407 + 0.005 * N) GHz. The channel index can be called by various names such as channel number. The specific numerical values of the channel index and the center frequency can be changed.

[0107] FIG. 10 exemplarily shows four channels within the 2.4 GHz band. The illustrated first frequency region 1010 to fourth frequency region 1040 can each include one channel. For example, the first frequency region 1010 can include channel 1 (the 20 MHz channel having index 1). At this time, the center frequency of channel 1 can be set to 2412 MHz. The second frequency region 1020 can include channel 6. At this time, the center frequency of channel 6 can be set to 2437 MHz. The third frequency region 1030 can include channel 11. At this time, the center frequency of channel 11 can be set to 2462 MHz. The fourth frequency region 1040 can include channel 14. At this time, the center frequency of channel 14 can be set to 2484 MHz.

[0108] FIG. 11 shows an example of channels used / supported / defined within the 5 GHz band.

[0109] The 5GHz band can be called by other names such as the second band / bandwidth. The 5GHz band can mean a frequency range in which channels with a center frequency of 5GHz or more and less than 6GHz (or less than 5.9GHz) are used / supported / defined. Or, the 5GHz band can include a plurality of channels between 4.5GHz and 5.5GHz. The specific numerical values shown in Figure 11 can be changed.

[0110] Multiple channels within the 5GHz band include UNII (Unlicensed National Information Infrastructure)-1, UNII-2, UNII-3, and ISM. UNII-1 can be called UNII Low. UNII-2 can include frequency ranges called UNII Mid and UNII-2 Extended. UNII-3 can be called UNII-Upper.

[0111] Multiple channels can be set within the 5GHz band, and the bandwidth of each channel can be set in various ways such as 20MHz, 40MHz, 80MHz, or 160MHz. For example, the frequency range of 5170MHz to 5330MHz within UNII-1 and UNII-2 can be divided into 8 20MHz channels. The frequency range of 5170MHz to 5330MHz can be divided into 4 channels through a 40MHz frequency range. The frequency range of 5170MHz to 5330MHz can be divided into 2 channels through an 80MHz frequency range. Or, the frequency range of 5170MHz to 5330MHz can be divided into 1 channel through a 160MHz frequency range.

[0112] Figure 12 shows an example of a channel used / supported / defined within the 6GHz band.

[0113] The 6 GHz band can be referred to by other names such as the third band / bandwidth. The 6 GHz band can mean a frequency range in which channels with a center frequency of 5.9 GHz or higher are used / supported / defined. The specific numerical values shown in Figure 12 can be changed.

[0114] For example, the 20 MHz channel in Figure 12 can be defined starting from 5.940 GHz. Specifically, among the 20 MHz channels in Figure 12, the leftmost channel can have an index of 1 (or channel index, channel number, etc.), and a center frequency of 5.945 GHz can be assigned. That is, the center frequency of the Nth-index channel can be determined as (5.940 + 0.005 * N) GHz.

[0115] Accordingly, the indices (or channel numbers) of the 20 MHz channels in Figure 12 are 1, 5, 9, 13, 17, 21, 25, 29, 33, 37, 41, 45, 49, 53, 57, 61, 65, 69, 73, 77, 81, 85, 89, 93, 97, 101, 105, 109, 113, 117, 121, 125, 129, 133, 137, 141, 145, 149, 153, 157, 161, 165, 169, 173, 177, 181, 185, 189, 193, 197, 201, 205, 209, 213, 217, 221, 225, 229, 233. Also, according to the aforementioned (5.940 + 0.005 * N) GHz rule, the indices of the 40 MHz channels in Figure 12 are 3, 11, 19, 27, 35, 43, 51, 59, 67, 75, 83, 91, 99, 107, 115, 123, 131, 139, 147, 155, 163, 171, 179, 187, 195, 203, 211, 219, 227.

[0116] In an example of Figure 12, 20, 40, 80, and 160 MHz channels are illustrated, but additionally 240 MHz channels and 320 MHz channels can be added.

[0117] Hereinafter, the PPDU transmitted / received by the STA in this specification will be described.

[0118] FIG. 13 shows an example of the PPDU used in this specification.

[0119] The PPDU of FIG. 13 can be 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 can be called by various names such as a transmission PPDU, a reception PPDU, a first-type or an Nth-type PPDU. Also, the EHT PPU can be used in an EHT system and / or a new wireless LAN system that improves the EHT system.

[0120] The PPDU of FIG. 13 can indicate some or all of the PPDU types used in the EHT system. For example, an example of FIG. 13 can be used for both the SU (single-user) mode and the MU (multi-user) mode. In other words, the PPDU of FIG. 13 is a PPDU for one receiving STA or a plurality of receiving STAs. When the PPDU of FIG. 13 is used for the TB (Trigger-based) mode, the EHT-SIG of FIG. 13 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 of FIG. 13 is omitted.

[0121] In FIG. 13, L-STF to EHT-LTF can be called a preamble or a physical preamble and can be generated / transmitted / received / acquired / decoded at the physical layer.

[0122] The subcarrier spacing of the L-STF, L-LTF, L-SIG, RL-SIG, U-SIG, and EHT-SIG fields in FIG. 13 is determined to be 312.5 kHz, and the subcarrier spacing of the EHT-STF, EHT-LTF, and Data fields can be determined to be 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.

[0123] In the PPDU of FIG. 13, the L-LTF and L-STF are the same as the conventional fields.

[0124] The L-SIG field in FIG. 13 can include, 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 include information regarding the length or time duration of the PPDU. For example, the value of the 12-bit Length field can be 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 can be determined to be a multiple of 3. For example, when the PPDU is a HE PPDU, the value of the Length field can be determined to be "a multiple of 3 + 1" or "a multiple of 3 + 2". In other words, for non-HT, HT, VHT PPDUs, or for EHT PPDUs, the value of the Length field can be determined to be a multiple of 3, and for HE PPDUs, the value of the Length field can be determined to be "a multiple of 3 + 1" or "a multiple of 3 + 2".

[0125] For example, the transmitting STA can apply BCC encoding based on a code rate of 1 / 2 to the 24-bit information in the L-SIG field. Subsequently, the transmitting STA can obtain 48-bit BCC-encoded bits. For the 48-bit encoded bits, BPSK modulation can be applied 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 can be mapped to subcarrier indices -26 to -22, -20 to -8, -6 to -1, +1 to +6, +8 to +20, and +22 to +26. The transmitting STA can additionally map signals of {-1, -1, -1, 1} to the subcarrier indices {-28, -27, +27, +28}. The above signals can be used for channel estimation for the frequency regions corresponding to {-28, -27, +27, +28}.

[0126] The transmitting STA can generate an RL-SIG that is generated in the same way as the L-SIG. BPSK modulation can be applied to the RL-SIG. Based on the presence of the RL-SIG, the receiving STA can know that the received PPDU is a HE PPDU or an EHT PPDU.

[0127] After the RL-SIG in FIG. 13, 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.

[0128] The U-SIG can contain N-bit information and can also contain information for identifying the type of EHT PPDU. For example, the U-SIG can be composed based on two symbols (e.g., two consecutive OFDM symbols). Each symbol (e.g., OFDM symbol) for the U-SIG can have a duration of 4 us. Each symbol of the U-SIG can be used to transmit 26-bit information. For example, each symbol of the U-SIG can be transmitted and received based on 52 data tones and 4 pilot tones.

[0129] Via the U-SIG (or the U-SIG field), for example, A-bit information (e.g., 52 un-coded bits) can be transmitted. The first symbol of the U-SIG can transmit the first X-bit information (e.g., 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 (e.g., 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 (i.e., BCC encoding) 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 can be transmitted based on 56 tones (sub-carriers) from sub-carrier index -28 to sub-carrier index +28 excluding the DC index 0. The 52 BPSK symbols generated by the transmitting STA can be transmitted based on the remaining tones (sub-carriers) excluding the pilot tones -21, -7, +7, +21 tones.

[0130] For example, the A-bit information (e.g., 52 un-coded bits) transmitted by U-SIG can include a CRC field (e.g., a 4-bit long field) and a tail field (e.g., a 6-bit long field). The CRC field and the tail field can be transmitted via the second symbol of U-SIG. The CRC field can be 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 can be generated based on a conventional CRC calculation algorithm. Also, the tail field can be used to terminate the trellis of the convolutional decoder and can be set to, for example, "000000".

[0131] 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 can be assigned only to the first symbol of U-SIG, or the version-independent bits can be assigned to both the first symbol and the second symbol of U-SIG. For example, the version-independent bits and the version-dependent bits can be called by various names such as the first control bit and the second control bit.

[0132] 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 transmitting an EHT PPDU, the transmitting STA can set the 3-bit PHY version identifier to 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 having the first value.

[0133] 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.

[0134] 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.

[0135] For example, when EHT PPDUs are classified into various types (such as EHT PPDUs related to SU mode, EHT PPDUs related to MU mode, EHT PPDUs related to TB mode, EHT PPDUs related to Extended Range transmission, etc.), information regarding the type of EHT PPDU can be included in the version-dependent bits of U-SIG.

[0136] For example, the U-SIG can include: 1) a bandwidth field including information on bandwidth; 2) a field including information on the MCS technique applied to the EHT-SIG; 3) an indication field including information related to whether the dual subcarrier modulation (DCM) technique is applied to the EHT-SIG; 4) a field including information on the number of symbols used for the EHT-SIG; 5) a field including information on whether the EHT-SIG is generated across the entire band; 6) a field including information on the type of EHT-LTF / STF; 7) information including information on a field indicating the length of the EHT-LTF and the CP length.

[0137] Preamble puncturing can be applied to the PPDU in FIG. 13. Preamble puncturing means applying puncturing to a partial band (e.g., the Secondary 20 MHz band) of the entire band of the PPDU. For example, when an 80 MHz PPDU is transmitted, the STA can apply puncturing to the secondary 20 MHz band of the 80 MHz band and transmit the PPDU only via the primary 20 MHz band and the secondary 40 MHz band.

[0138] For example, the pattern of preamble puncturing can be set in advance. For example, when the first puncturing pattern is applied, puncturing can be applied only to the secondary 20 MHz band within the 80 MHz band. For example, when the second puncturing pattern is applied, puncturing can be applied only to 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 can be applied only to the secondary 20 MHz band included in the primary 80 MHz band within the 160 MHz band (or 80 + 80 MHz band). For example, when the fourth puncturing pattern is applied, the primary 40 MHz band included in the primary 80 MHz band within the 160 MHz band (or 80 + 80 MHz band) is present, and puncturing can be applied to at least one 20 MHz channel that does not belong to the primary 40 MHz band.

[0139] Information regarding preamble puncturing applied to the PPDU can be included in the U-SIG and / or EHT-SIG. For example, the first field of the U-SIG can include information regarding the contiguous bandwidth of the PPDU, and the second field of the U-SIG can include information regarding preamble puncturing applied to the PPDU.

[0140] 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 can be individually configured in 80 MHz units. For example, when the bandwidth of the PPDU is 160 MHz, the corresponding PPDU can include a first U-SIG for the first 80 MHz band and a second U-SIG for the second 80 MHz band. In this case, the first field of the first U-SIG can include 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 can include 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).

[0141] Additionally 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).

[0142] The U-SIG can be configured in units of 20 MHz. For example, when an 80 MHz PPDU is configured, the U-SIG can be replicated. That is, the same 4 U-SIGs can be included in the 80 MHz PPDU. A PPDU exceeding the 80 MHz bandwidth can include different U-SIGs.

[0143] The EHT-SIG in FIG. 13 can include control information for the receiving STA. The EHT-SIG can be 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 can be included in the U-SIG.

[0144] The EHT-SIG can include the technical features of the HE-SIG-B described via FIGS. 7 to 8. For example, the EHT-SIG can include a common field and a user-specific field, similar to an example in FIG. 7. The common field of the EHT-SIG can be omitted, and the number of user-specific fields can be determined based on the number of users.

[0145] Similar to an example in FIG. 7, the common field of the EHT-SIG and the user-specific field of the EHT-SIG can be individually coded. One user block field included in the user-specific field can include information for 2 users, but the last user block field included in the user-specific field can include information for 1 user. That is, one user block field of the EHT-SIG can include a maximum of 2 user fields. Similar to an example in FIG. 8, each user field can be related to a MU-MIMO allocation or a non-MU-MIMO allocation.

[0146] Similar to an example in FIG. 7, 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 can be determined to be 6 bits and set to "000000".

[0147] Similar to an example in FIG. 7, the common field of the EHT-SIG can include RU allocation information. RU allocation information can mean information regarding the location of RUs allocated to a plurality of users (i.e., a plurality of receiving STAs). As shown in Table 1, RU allocation information can be configured in units of 8 bits (or N bits).

[0148] Examples of Tables 5 to 7 are examples of 8-bit (or N-bit) information for various RU allocations. The indexes displayed in each table can be changed, some entries in Tables 5 to 7 can be omitted, and entries not displayed can be added.

[0149]

Table 5

[0150]

Table 6

[0151]

Table 7

[0152] An example of Tables 5 to 7 is related to information regarding the positions of RUs allocated to the 20 MHz band. For example, "Index 0" in Table 5 can be used in a situation where 9 individual 26-RUs are allocated (for example, the situation where 9 individual 26-RUs shown in FIG. 4 are allocated).

[0153] On the other hand, in an EHT system, it is possible to allocate a plurality of RUs to one STA. For example, "Index 60" in Table 6 indicates that one 26-RU is allocated for one user (i.e., the receiving STA) on the leftmost side of the 20 MHz band, one 26-RU and one 52-RU are allocated for other users (i.e., the receiving STA) on the right side thereof, and 5 individual 26-RUs can be allocated on the right side thereof.

[0154] A mode in which the common field of the EHT-SIG is omitted can be supported. The mode in which the common field of the EHT-SIG is omitted 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 (for example, the data field of the PPDU) based on non-OFDMA. That is, a plurality of users of the EHT PPDU can decode the PPDU (for example, 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 (for example, the data field of the PPDU) based on OFDMA. That is, a plurality of users of the EHT PPDU can receive the PPDU (for example, the data field of the PPDU) via different frequency bands.

[0155] The EHT-SIG can be configured based on various MCS techniques. As described above, information related to the MCS techniques applied to the EHT-SIG can be included in the U-SIG. The EHT-SIG can be 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 can be applied to the consecutive first half of the tones, and the second modulation technique can be 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, information (e.g., a 1-bit field) related to whether the DCM technique is applied to the EHT-SIG can be included in the U-SIG.

[0156] The EHT-STF in FIG. 13 can be used to improve automatic gain control estimation in a MIMO (multiple input multiple output) environment or an OFDMA environment. The EHT-LTF in FIG. 13 can be used to estimate the channel in a MIMO environment or an OFDMA environment.

[0157] The PPDU in FIG. 13 (i.e., the EHT-PPDU) can be configured based on an example in FIGS. 4 and 5.

[0158] For example, an EHT PPDU transmitted on a 20 MHz band, i.e., a 20 MHz EHT PPDU, can be configured based on the RU in FIG. 4. That is, the locations of the EHT-STF, EHT-LTF, and data field RUs included in the EHT PPDU can be determined as shown in FIG. 4.

[0159] The EHT PPDU transmitted in the 40 MHz band, i.e., the 40 MHz EHT PPDU, can be configured based on the RUs in FIG. 5. That is, the locations of the RUs in the EHT-STF, EHT-LTF, and data field included in the EHT PPDU can be determined as shown in FIG. 5.

[0160] Since the RU positions in FIG. 5 correspond to 40 MHz, when the pattern in FIG. 5 is repeated twice, a tone-plan for 80 MHz can be determined. That is, the 80 MHz EHT PPDU can be transmitted based on a new tone-plan in which the RUs in FIG. 5 that are not in FIG. 6 are repeated twice.

[0161] When the pattern in FIG. 5 is repeated twice, 23 tones (i.e., 11 guard tones + 12 guard tones) can be 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 full Bandwidth 80 MHz PPDU) is configured based on 996 RUs and can include 5 DC tones, 12 left guard tones, and 11 right guard tones.

[0162] The tone-plan for 160 / 240 / 320 MHz can be configured by repeating the pattern in FIG. 5 multiple times.

[0163] The PPDU in FIG. 13 can be determined (or identified) as an EHT PPDU based on the following method.

[0164] 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 can be determined to be an EHT PPDU. When the received PPDU is determined to be 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. 13. In other words, the receiving STA is 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, 3) the L-SIG including the Length field whose result of applying "modulo 3" is set to "0", and 4) the 3-bit PHY version identifier of the U-SIG described above (for example, the PHY version identifier having the first value), the received PPDU can be determined to be an EHT PPDU.

[0165] 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 can be determined to be a HE PPDU.

[0166] 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) if the RL-SIG in which the L-SIG is repeated is not detected, the received PPDU can be determined as non-HT, HT, and VHT PPDU. Also, even if the receiving STA detects the repetition of the RL-SIG, if the result of applying "modulo 3" to the Length value of the L-SIG is detected as "0", the received PPDU can be determined as non-HT, HT, and VHT PPDU.

[0167] In the following example, the signals represented by (transmission / reception / upward / downward) signals, (transmission / reception / upward / downward) frames, (transmission / reception / upward / downward) packets, (transmission / reception / upward / downward) data units, (transmission / reception / upward / downward) data, etc. are signals transmitted and received based on the PPDU in FIG. 13. The PPDU in FIG. 13 can be used to transmit and receive various types of frames. For example, the PPDU in FIG. 13 can be used for control frames. An example of a control frame can include RTS (request to send), CTS (clear to send), PS-Poll (Power Save-Poll), BlockACKReq, BlockAck, NDP (Null Data Packet) announcement, Trigger Frame. For example, the PPDU in FIG. 13 can be used for management frames. An example of a management frame can include Beacon frame, (Re-)Association Request frame, (Re-)Association Response frame, Probe Request frame, Probe Response frame. For example, the PPDU in FIG. 13 can be used for data frames. For example, the PPDU in FIG. 13 can also be used to simultaneously transmit at least two or more of control frames, management frames, and data frames.

[0168] FIG. 14 shows a modified example of the transmission device and / or reception device in this specification.

[0169] Each device / STA in the sub-drawings (a) / (b) of FIG. 1 can be modified as shown in FIG. 14. The transceiver 630 in FIG. 19 is the same as the transceivers 113, 123 in FIG. 1. The transceiver 630 in FIG. 19 can include a receiver and a transmitter.

[0170] The processor 610 in FIG. 14 is the same as the processors 111 and 121 in FIG. 1. Alternatively, the processor 610 in FIG. 14 is the same as the processing chips 114 and 124 in FIG. 1.

[0171] The memory 620 in FIG. 14 is the same as the memories 112 and 122 in FIG. 1. Alternatively, the memory 620 in FIG. 14 is a separate external memory different from the memories 112 and 122 in FIG. 1.

[0172] Referring to FIG. 14, 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 results processed by the processor 610. The keypad 614 receives the inputs used by the processor 610. The keypad 614 can be displayed on the display 613. The SIM card 615 is an integrated circuit used to securely store the IMSI (international mobile subscriber identity) and related keys used to identify and authenticate subscribers in mobile phone devices such as mobile phones and computers.

[0173] Referring to FIG. 14, the speaker 640 can output the sound-related results processed by the processor 610. The microphone 641 can receive the sound-related inputs used by the processor 610.

[0174] Hereinafter, the technical features applicable to the EHT standard can be described.

[0175] According to one embodiment, in the EHT standard, a PPDU with a bandwidth of 320 MHz can be supported. Also, 240 MHz and 160 + 80 MHz transmissions can be supported. The 240 MHz and 160 + 80 MHz can be configured by applying 80 MHz preamble puncturing at 320 MHz. For example, the 240 MHz and 160 + 80 MHz bandwidths can be configured based on three 80 MHz channels including a primary 80 MHz.

[0176] According to one embodiment, in the EHT standard, the tone plan of the 11ax standard can be used for 20 / 40 / 80 / 160 MHz PPDUs. According to one embodiment, the 160 MHz OFDMA tone plan of the 11ax standard can be replicated and used for 320 MHz PPDUs.

[0177] According to one embodiment, 240 MHz and 160 + 80 MHz transmissions can be composed of three 80 MHz segments. According to one embodiment, the 160 MHz tone plan can be replicated and used for the non - OFDMA tone plan of 320 MHz PPDUs.

[0178] According to one embodiment, 12 and 11 null tones can be configured on the left - most and right - most sides respectively in each 160 MHz segment for the non - OFDMA tone plan of 320 MHz PPDUs.

[0179] According to one embodiment, 12 and 11 null tones can be configured on the left - most and right - most sides respectively in each 160 MHz segment for the non - OFDMA tone plan of 320 / 160 + 160 MHz PPDUs.

[0180] According to one embodiment, the data part of the EHT PPDU can use the same sub - carrier spacing as the data part of the 11ax standard.

[0181] The following can describe the technical features regarding the RU (Resource Unit) that can be applied to the EHT standard.

[0182] According to one embodiment, in the EHT standard, one or more RUs can be allocated to a single STA. For example, coding and interleaving schemes for multiple RUs allocated to a single STA can be variously set.

[0183] According to one embodiment, small-size RUs can be combined with small-size RUs. According to one embodiment, large-size RUs can be combined with large-size RUs.

[0184] For example, RUs of 242 tones or more can be defined / set as large-size RUs. As another example, RUs of less than 242 tones can be defined / set as small-size RUs.

[0185] According to one embodiment, there is one PSDU per STA for each link. According to one embodiment, for LDPC encoding, one encoder can be used for each PSDU.

[0186] Small-size RUs

[0187] According to one embodiment, the combination of small-size RUs can be set so as not to exceed the 20MHz channel boundary. For example, combinations of small-size RUs such as RU106+RU26 and RU52+RU26 can be formed.

[0188] According to one embodiment, in 20MHz and 40MHz PPDUs, consecutive RU26 and RU106 can be combined / joined within the 20MHz boundary.

[0189] According to one embodiment, RU26 and RU52 can be combined / associated in 20 MHz and 40 MHz PPDUs.

[0190] For example, examples of consecutive RU26 and RU52 at 20 MHz (or 20 MHz PPDU) can be illustrated via FIG. 21.

[0191] FIG. 15 shows an example of a combination of RU26 and RU52 at 20 MHz.

[0192] Referring to FIG. 15, the hatched RU26 and RU52 can be combined. For example, the second RU26 and the second RU52 can be combined. As another example, the seventh RU26 and the third RU52 can be combined.

[0193] For example, examples of consecutive RU26 and RU52 at 40 MHz can be illustrated via FIG. 16.

[0194] FIG. 16 shows an example of a combination of RU26 and RU52 at 40 MHz.

[0195] Referring to FIG. 16, the hatched RU26 and RU52 can be combined. For example, the second RU26 and the second RU52 can be combined. As another example, the eighth RU26 and the third RU52 can be combined. As another example, the eleventh RU26 and the sixth RU52 can be combined. As another example, the seventeenth RU26 and the seventh RU52 can be combined.

[0196] According to one embodiment, RU26 and RU52 can be combined / associated in 80 MHz PPDUs.

[0197] For example, examples of consecutive RU26 and RU52 at 80 MHz can be illustrated via FIG. 17.

[0198] Figure 17 shows an example of the combination of RU26 and RU52 at 80 MHz.

[0199] Referring to Figure 17, 80 MHz can be divided into the first 40 MHz and the second 40 MHz. For example, within the first 40 MHz, the 8th RU26 and the 3rd RU52 can be combined. As another example, within the first 40 MHz, the 11th RU26 and the 6th RU52 can be combined. As another example, within the second 40 MHz, the 8th RU26 and the 3rd RU52 can be combined. As another example, within the second 40 MHz, the 11th RU26 and the 6th RU52 can be combined.

[0200] According to one embodiment, when LDPC coding is applied, a single tone mapper can be used for RUs combined with a size less than 242 tones.

[0201] Large-size RUs

[0202] According to one embodiment, in 320 MHz OFDMA transmission, for a single STA, large-size RU combination is only allowed within the primary 160 MHz or the secondary 160 MHz. For example, the primary 160 MHz can be composed of the primary 80 MHz and the secondary 80 MHz. The secondary 160 MHz can be composed of channels excluding the primary 160 MHz.

[0203] According to one embodiment, in 240 MHz OFDMA transmission, for a single STA, large-size RU combination is only allowed within 160 MHz, and the 160 MHz can be composed of two adjacent 80 MHz channels.

[0204] According to one embodiment, in 160 + 80 MHz OFDMA transmission, for a single STA, large-sized RU combinations are only allowed within continuous 160 MHz or within the remaining 80 MHz.

[0205] In 160 MHz OFDMA, large-sized RU combinations configured as shown in Table 8 can be supported.

[0206]

Table 8

[0207] In 80 MHz OFDMA, large-sized RU combinations configured as shown in Table 9 can be supported.

[0208]

Table 9

[0209] In 80 MHz non-OFDMA, large-sized RU combinations configured as shown in Table 10 can be supported. In 80 MHz non-OFDMA, puncturing can be applied. For example, one out of four 242 RUs can be punctured.

[0210]

Table 10

[0211] In 160 MHz non-OFDMA, large-sized RU combinations configured as shown in Table 11 can be supported. In 160 MHz non-OFDMA, puncturing can be applied. For example, one out of eight 242 RUs can be punctured. As another example, one out of four 484 RUs can be punctured.

[0212]

Table 11

[0213] Large-sized RU combinations configured as shown in Table 12 can be supported at 240 MHz non-OFDMA. Puncturing can be applied at 240 MHz non-OFDMA. For example, one out of six 484 RUs can be punctured. As another example, one out of three 996 RUs can be punctured.

[0214]

Table 12

[0215] Large-sized RU combinations configured as shown in Table 13 can be supported at 320 MHz non-OFDMA. Puncturing can be applied at 320 MHz non-OFDMA. For example, one out of eight 484 RUs can be punctured. As another example, one out of four 996 RUs can be punctured.

[0216]

Table 13

[0217] Hereinafter, the specification can describe the technical features regarding the Operating mode.

[0218] According to one embodiment, an EHT standard STA (hereinafter, EHT STA) (or HE STA) can operate in a 20MHz channel width mode. In the 20MHz channel width mode, the EHT STA can use the operating mode indication (OMI) to reduce the operating channel width to 20MHz and operate.

[0219] According to one embodiment, an EHT STA (or HE STA) can operate in an 80MHz channel width mode. For example, in the 80MHz channel width mode, the EHT STA can use the operating mode indication (OMI) to reduce the operating channel width to 80MHz and operate.

[0220] According to one embodiment, an EHT STA can support SST (subchannel selective transmission). An STA that supports SST can quickly select different channels during transmission to adapt to fading in a narrow subchannel and can switch.

[0221] The 802.11be standard (i.e., the EHT standard) can provide a higher data rate than the 802.11ax standard. The EHT (extreme high throughput) standard can support wide bandwidth (up to 320MHz), 16 streams, and multi-band operation.

[0222] In the EHT standard, wide bandwidth (up to 320 MHz) and various preamble puncturing or multiple RU allocations can be supported in SU / MU transmission. Also, in the EHT standard, in order to support STAs with low-end capabilities (e.g., 80 MHz only operating STAs), a signal transmission / reception method via 80 MHz segment allocation is considered. Therefore, hereinafter, in the specification, when considering SST (subchannel selective transmission) and Multi-RU aggregation defined in the 11ax standard during MU transmission, an EHT-SIG configuration method and a transmission method therefor can be proposed.

[0223] Composition of EHT PPDU

[0224] To support a transmission method based on the EHT standard, a new frame format can be utilized. When transmitting a signal via the 2.4 / 5 / 6 GHz band using the new frame format, not only receivers supported by the EHT standard but also convention Wi-Fi receivers (or STAs) (e.g., receivers according to the 802.11n / ac / ax standards) can receive the EHT signal transmitted via the 2.4 / 5 / 6 GHz band.

[0225] The preamble of the PPDU based on the EHT standard can be set in various ways. Hereinafter, examples of how the preamble of the PPDU based on the EHT standard is configured can be described. Hereinafter, the PPDU based on the EHT standard can be described as an EHT PPDU. However, the EHT PPDU is not limited to the EHT standard. The EHT PPDU can include not only the 802.11be standard (i.e., the EHT standard) but also PPDUs based on new standards that improve / evolve / extend the 802.11be standard.

[0226] FIG. 18 shows an example of an EHT PPDU.

[0227] Referring to FIG. 18, the EHT PPDU 1800 can include an L-part 1810 and an EHT-part 1820. The EHT PPDU 1800 can be configured in a format to support backward compatibility. Also, the EHT PPDU 1800 can be transmitted to a single STA and / or multiple STAs. The EHT PPDU 1800 is an example of an MU-PPDU of the EHT standard.

[0228] The EHT PPDU 1800 can be configured in a structure where the L-part 1810 is transmitted first before the EHT-part 1820 for coexistence or backward compatibility with legacy STAs (STAs according to the 802.11n / ac / ax standards). For example, the L-part 1810 can include an L-STF, an L-LTF, and an L-SIG. For example, phase rotation can be applied to the L-part 1810.

[0229] According to one embodiment, the EHT-part 1820 can include an RL-SIG, a U-SIG 1821, an EHT-SIG 1822, an EHT-STF, an EHT-LTF, and a data field. Similar to the 11ax standard, the RL-SIG can be included in the EHT-part 1820 for the reliability and range extension of the L-SIG. The RL-SIG can be transmitted immediately after the L-SIG and can be configured to repeat the L-SIG.

[0230] For example, four additional subcarriers can be applied to L-SIG and RL-SIG. The additional subcarriers can be composed of [-28, -27, 27, 28]. The additional subcarriers can be modulated in the BPSK scheme. Also, coefficients of [-1 -1 -1 1] can be mapped to the additional subcarriers.

[0231] For example, EHT-LTF can be composed of one of 1xEHT-LTF, 2xEHT-LTF, or 4xEHT-LTF. The EHT standard can support EHT-LTF for 16 spatial streams.

[0232] Each field in FIG. 18 is the same as each field described in FIG. 13.

[0233] Hereinafter, technical features that can be additionally improved in this specification will be described.

[0234] In a wireless LAN system, a 6 GHz band can be newly set. The 6 GHz band can include 20 / 40 / 80 / 160 / 320 MHz channels in the frequency region described in FIG. 12. For example, when transmitting and receiving signals in an indoor environment via the 6 GHz band, low power transmission must be performed. That is, the transmission power of the wireless LAN signal can be limited for the existing transmission and reception devices used in the 6 GHz band. As a result, when transmitting and receiving a PPDU (for example, the EHT PPDU) via the 6 GHz band, a problem may occur in that the transmission range becomes short due to the low power transmission. Accordingly, this specification proposes a transmission and reception technique for range extension. On the other hand, an example of this specification is preferably applied to PPDU transmission and reception in the 6 GHz band, but can also be used in other bands where a problem of a short transmission range may occur.

[0235] This specification proposes various technical features for range extension. The various technical features proposed in this specification are preferably applied to transmission / reception PPDUs. In other words, an example of this specification proposes various transmission / reception PPDUs for range extension. An example of the transmission / reception PPDU can include various fields described in FIGS. 3, 7, 8, 13, 18, and 19.

[0236] More specifically, an example of the transmission / reception PPDU can include at least one legacy field (e.g., L-STF, L-LTF, L-SIG, and RL-SIG in FIG. 18). Also, an example of the transmission / reception PPDU can include a first control signal field (e.g., U-SIG field) and a second control signal field (e.g., EHT-SIG field) for the transmission / reception PPDU. For example, the first control signal field is U-SIG1821 in FIG. 18, and the second control signal field is EHT-SIG1822 in FIG. 18. Also, an example of the transmission / reception PPDU can include an STF (e.g., EHT-STF), an LTF (e.g., EHT-LTF), and a data field.

[0237] The various technical features for range extension can be applied to the first control signal field (e.g., U-SIG field), the second control signal field (e.g., EHT-SIG field), the STF (e.g., EHT-STF), the LTF (e.g., EHT-LTF), and / or the data field.

[0238] Hereinafter, the first control signal field (e.g., U-SIG field) and the second control signal field (e.g., EHT-SIG field) will be specifically described.

[0239] Control information not included in the first control signal field (e.g., U-SIG field) can be called by various names such as overflowed information or overflow information. The second control signal field (e.g., EHT-SIG field) can include a common field and a user specific field. Each of the common field and the user specific field can include at least one encoding block (e.g., binary convolutional code (BCC) encoding block). One encoding block can be transmitted / received via at least one symbol, and it is not necessarily the case that one encoding block is transmitted via one symbol. On the other hand, one symbol for transmitting an encoding block can have a symbol length of 4 us.

[0240] The transmit / receive PPDU proposed in this specification can be used for communication for at least one user. For example, the technical features of this specification can be applied to MU-PPDU (e.g., EHT MU PPDU) according to the 11be standard. For example, an example of MU-PPDU for transmitting signals to multiple STAs considering backward compatibility is the PPDU in FIG. 18.

[0241] FIG. 19 shows an example of the first control signal field or U-SIG field of this specification.

[0242] As shown, the first control signal field (e.g., U-SIG field) can include a Version independent field 1910 and a version dependent field 1920. For example, the Version independent field 1910 can include control information that is continuously included regardless of the Version of the wireless LAN (e.g., IEEE802.11be and the next-generation standard of 11be). For example, the version dependent field 1920 can include control information that is dependent on the corresponding Version (e.g., IEEE802.11be standard).

[0243] For example, the Version independent field 1910 can include a 3-bit version identifier indicating 11be and Wi-Fi versions after 11be, a 1-bit DL / UL field BSS color, and / or information related to TXOP duration. For example, the version dependent field 1920 can include information related to the PPDU format type and / or Bandwidth, MCS.

[0244] For example, the first control signal field (e.g., U-SIG field) shown in FIG. 19 can have two symbols (e.g., two consecutive 4 us-long symbols) jointly encoded. Also, the field in FIG. 19 can be configured based on 52 data tones and 4 pilot tones for each 20 MHz band / channel. Also, the field in FIG. 19 can be modulated in the same manner as HE-SIG-A of the conventional 11ax standard. In other words, the field in FIG. 19 can be modulated based on a BPSK 1 / 2 code rate.

[0245] For example, the second control signal field (e.g., the EHT-SIG field) can be distinguished into a Common field and a user specific field, and can be encoded based on various MCS levels. For example, the Common field can include indication information related to the spatial stream used in the transmitted / received PPDU (e.g., the data field) and indication information related to the RU. For example, the user specific field can include ID information used by at least one specific user (or the receiving STA), MCS, and indication information related to coding. In other words, the user specific field can include decoding information (e.g., STA ID information, MCS information, and / or channel coding type / rate information assigned to the corresponding RU) for the data field transmitted via at least one RU indicated by the RU allocation sub-field included in the common field.

[0246] An example of the information field / bit that can be included in the first control signal field (e.g., the U-SIG field) is as shown in Table 14 below. As described below, since there are constraints on the length of the first control signal field (e.g., the U-SIG field), some of the fields in Table 14 can overflow into other fields. That is, the bit lengths described in the following table can be changed, and at least one of the individual fields / bits described in the following table can be omitted. Also, other fields / bits can be added.

[0247]

Table 14

[0248] The first control signal field (e.g., U-SIG field) can be composed of two consecutive symbols. In this case, the maximum number of bits that can be included in the first control signal field (e.g., U-SIG field) can be fixed or pre-set (e.g., fixed or pre-set at 48 / 52 bits, etc.). Therefore, there can be information that is not included in the first control signal field (e.g., U-SIG field), and such information can be called by various names such as overflowed information, overflow information, U-SIG overflow, and U-SIG overflow information / field. According to an example in this specification, the overflowed information is preferably included in the second control signal field (e.g., EHT-SIG field). Also, since the overflowed information is not user specific information, the corresponding information is preferably included in the Common field of the second control signal field (e.g., EHT-SIG field).

[0249] Hereinafter, an example of various technical features for range extension will be described.

[0250] Feature 1: Below, an example of a PPDU for range extension is proposed. The EHT PPDU to which technical features related to range extension are applied can be denoted by various names such as "11be ER PPDU", "EHT ER PPDU", "ER PPDU", "ER transmission signal", "ER transmission". Also, since it can be applied to the replication technique for some fields / RUs of the PPDU for range extension, the PPDU for range extension can be configured based on the duplicate transmission mode. That is, the said "ER PPDU" can also be denoted as a PPDU configured based on the duplicate transmission mode.

[0251] The "ER PPDU" in this specification can mean PPDUs in various formats for ER transmission. The "ER PPDU" in this specification can include a signal field (e.g., the U-SIG field for the EHT MU PPDU) that supports the normal SU / MU mode, or can include a signal field separately designed for the ER mode. On the other hand, the technical features presented below can also be applied not only to the IEEE802.11be standard but also to other wireless LAN standards.

[0252] Feature 1.a. As described above, the first control signal field (e.g., the U-SIG field) can include a field (or sub-field) related to the PPDU type. In this case, the field related to the said PPDU-type can be configured as follows.

[0253] Feature 1.a.i. The field related to the PPDU type can be composed of 2-bit information. In this case, one entry of the 2-bit information can indicate an extend range PPDU.

[0254] Feature 1.a.i.1. For example, within the 2-bit information, a first value (e.g., 00) can indicate a SU PPDU, a second value (e.g., 01) can indicate a MU-PPDU, a third value (e.g., 10) can indicate a TB PPDU, and a fourth value (e.g., 11) can indicate the ER PPDU. It is also possible that only some of the above-mentioned multiple values are used.

[0255] Feature 1.a.i.1.a. For example, within the 2-bit information, it is also possible to indicate a SU-PPDU and a MU-PPDU via one same entry (i.e., the first value).

[0256] Feature 1.a.i.1.b. For example, the ER PPDU can be composed of SU / MU PPDUs.

[0257] Feature 1.a.ii. As another example, 3-bit information within a first control signal field (e.g., U-SIG field) can be used. For example, the 3-bit information can be composed of two consecutive sub-fields. For example, the 3-bit information can be composed via a first sub-field regarding the PPDU type composed of 2 bits and a second sub-field composed of 1 bit. The second sub-field can include information regarding the HARQ operation applied to the transmitted / received PPDU (e.g., Redundancy Version, New Data Indicator, information regarding the HARQ processor number) and / or information regarding the Multi-AP communication technique applied to the transmitted / received PPDU. For example, the 3-bit information can be composed of one sub-field, and at least one entry (i.e., at least one pre-set value) within the one sub-field includes information regarding the PPDU type, and at least one other entry can include the information regarding the HARQ operation (e.g., Redundancy Version, New Data Indicator, information regarding the HARQ processor number) and / or information regarding the Multi-AP communication technique applied to the transmitted / received PPDU.

[0258] When the value of the PPDU type subfield of Feature 1.b has a pre-set value for the ER PPDU, for range extension, power boosting can be applied to the L-STF, L-LTF, L-SIG, RL-SIG, STF, and / or LTF. For example, the power boosting can be applied from the L-STF to the RL-SIG, or from the L-STF to the first control signal field (e.g., the U-SIG field) or the second control signal field (e.g., the EHT-SIG field), or from the L-STF to the STF (e.g., the EHT-STF) or the LTF (e.g., the EHT-LTF). The power boosting can be applied by about 1 / 2 / 3 dB.

[0259] To enhance the robustness of the first control signal field (e.g., the U-SIG field) that contains the Common information of Feature 1.c, the first control signal field (e.g., the U-SIG field) can be repeated in the time domain. For example, the first control signal field (e.g., the U-SIG field) composed of two consecutive symbols can be repeated to be composed of a total of four symbols.

[0260] Feature 1.c.i. Hereinafter, an example of the repetition of symbols for the first control signal field (e.g., the U-SIG field) will be described.

[0261] Feature 1.c.i.1. For example, the first control signal field (e.g., the U-SIG field) can be repeated in units of two symbols. FIG. 20 is an example of the repetition of symbols for the first control signal field. As shown in the figure, the same two symbols (e.g., U-SIG-1 and U-SIG-2) can be positioned continuously for the two symbols (e.g., U-SIG-1 and U-SIG-2) of the first control signal field.

[0262] Feature 1.c.i.2. For example, the first control signal field (e.g., the U-SIG field) can be repeated in units of one symbol. FIG. 20 is another example of the repetition of symbols for the first control signal field. As shown in the figure, it is possible that the first symbol (e.g., U-SIG-1) of the two symbols of the first control signal field is repeated, and then the remaining symbol (e.g., U-SIG-2) is repeated.

[0263] Feature 1.c.ii. When the first control signal field (e.g., the U-SIG field) is repeated, additional technical features can be applied to the repeated first control signal field.

[0264] Feature 1.c.ii.1. For example, it is possible not to apply interleaving, or to apply the bipolar technique, or to multiply by a specific sequence to the symbols for the repeated first control signal field.

[0265] Feature 1.c.ii.2. For example, in an example of FIG. 20 or FIG. 21, it is possible to apply interleaving to the U-SIG-1 symbol and the U-SIG-2 symbol, and not to apply interleaving to the RU-SIG-1 symbol and the RU-SIG-2 symbol.

[0266] Feature 1.c.iii. Similar to the example described above, an example of repeating the second control signal field (e.g., the EHT-SIG field) in the time domain will be described below.

[0267] Feature 1.c.iii.1. For example, the second control signal field (e.g., the EHT-SIG field) can be composed of 1 or 2 OFDM symbols. In this case, based on an example in FIG. 20, the second control signal field can be repeated in units of 2 symbols, or based on an example in FIG. 21, the second control signal field can be repeated in units of 1 symbol.

[0268] Feature 1.c.iii.2. FIG. 22 shows an example of repeating the second control signal field. As shown in FIG. 22, when the second control signal field (e.g., the EHT-SIG field) is composed of 2 OFDM symbols, it can be repeated in the time domain.

[0269] Feature 1.d. As another example, the value of the PPDU type field configured within the first control signal field (e.g., the U-SIG field) has a preset value for the ER PPDU, and an MCS level lower than the conventional MCS0 level (e.g., the MCS level to which the DCM and BPSK techniques are applied) can be applied to the first control signal field (e.g., the U-SIG field). In this case, the first control signal field (e.g., the U-SIG field) can be composed via 4 symbols.

[0270] Feature 1.d.i. In the above example, since the ER PPDU is indicated via the PPDU type field, no additional indication for robust modulation or DCM is required.

[0271] Feature 1.e. Similar to the first control signal field, techniques for range extension (e.g., techniques where symbols are repeated in the time domain or DCM modulation is applied) can also be applied to the symbols for the second control signal field (e.g., the EHT-SIG field).

[0272] Feature 1.e.i. In this case, whether the DCM technique is applied to the second control signal field (e.g., the EHT-SIG field) can be indicated via the first control signal field (e.g., the U-SIG field). That is, a subfield of the first control signal field (e.g., the U-SIG field) can include information regarding whether the DCM technique is applied to the second control signal field.

[0273] Feature 1.f. The ER PPDU can be modified as follows.

[0274] Feature 1.f.i. The symbols for the first control signal field (e.g., the U-SIG field) can be repeated in the time domain as described in Feature 1.C above.

[0275] Feature 1.f.ii. For example, the first control signal field can be repeated in units of two symbols or one symbol as described in Feature 1.C above.

[0276] Feature 1.f.iii. For example, the second control signal field (e.g., the EHT field) can be repeated / copied in the frequency domain without being repeated in the time domain. For example, the second control signal field (e.g., the EHT field) can be duplicated in frequency based on 20 MHz units.

[0277] Feature 1.f.iv. FIG. 23 shows an example where the first and second control signal fields are repeated. An example of FIG. 23 is related to an 80 MHz PPDU. As shown, the first control signal field can be repeated / copied in the time domain, and the second control signal field can be repeated / copied in the frequency domain.

[0278] Feature 1.f.iv.1. As in the example of FIG. 23, the first control signal field (i.e., the U-SIG field) can be repeated / copied in the time domain. For example, two symbols for the original first control signal field and an additional two symbols for the repeated / copied signal field can be included in the ER PPDU. On the other hand, as in the example of FIG. 23, the second control signal field (i.e., the EHT-SIG field) can be repeated / copied in the frequency band in a 20 MHz segment without being repeated / copied in the time domain.

[0279] Feature 1.f.iv.2. The receiving STA can confirm that the received PPDU is an ER PPDU (or an ER PPDU for SU communication) based on the feature that the first control signal field is repeated.

[0280] Feature 1.g. The following technical features can be applied to the RUs included in the ER PPDU.

[0281] Feature 1.g.i. For example, 26-tone RUs, 52-tone RUs, 106-tone RUs, 242-tone RUs (or RU26, RU52, RU106, RU242, etc.) shown in FIG. 4 can be aggregated in various ways. For example, multiple RUs can be aggregated in various ways based on an example such as FIG. 15. The RU PPDU in this specification can support various RU aggregations.

[0282] Feature 1.g.ii. For example, the size of the RU that can be used in the ER PPDU of this specification is as follows.

[0283] Feature 1.g.ii.1. According to the first example, RUs of all sizes can be used for the ER PPDU of this specification. For example, RU26, RU52, RU26+RU52 (i.e., an aggregated RU of 26-tone RU and 52-tone RU), RU106, RU106+RU26, and RU242 can all be used.

[0284] Feature 1.g.ii.1.a. For example, for a specific ER PPDU, any one of the available RU sizes (e.g., the six sizes mentioned above) can be applied. That is, the data field of a specific ER PPDU can be composed of an RU of a certain size.

[0285] Feature 1.g.ii.2. According to the second example, only RUs with a size of 106 tones or more can be used for the ER PPDU.

[0286] Feature 1.g.ii.2.a. For example, for a specific ER PPDU, one of the three RU sizes (e.g., RU106, RU106+RU26, RU242) can be selected.

[0287] Feature 1.g.ii.2.b. According to another example, only RU106 and RU242 to which RU aggregation is not applied can be used for the ER PPDU of this specification.

[0288] Feature 1.g.ii.3. When transmitting the ER PPDU, information about the size of the RU available for data transmission of the ER PPDU can be transmitted via the first / second control signal fields (i.e., U-SIG and / or EHT-SIG).

[0289] Feature 1.g.ii.3.a. For example, information on the size of the RU available for data transmission of the ER PPDU can be included in the ER allocation field, and the ER allocation field can be included in the first / second control signal field. The ER allocation field can be composed of 1 bit or 2 bits and can be called by various names. The following is an example of the ER allocation field. For example, when the ER allocation field has a first value (i.e., 00), only the 106-tone RU can be used for the data signal / field, etc. of the ER PPDU.

[0290]

Table 15

[0291] Feature 1.g.iii. As described above, when a RU of a specific size is used to transmit the data signal / field of the ER PPDU, the following technical features can be additionally applied.

[0292] Feature 1.g.iii.1. For example, the fixed RU with power boosting technique described below can be used.

[0293] Feature 1.g.iii.1.a. For example, when transmitting the ER PPDU, the position of the available RU can be preset based on the RU size used within the 20 MHz band (e.g., the RU size indicated by the ER allocation field). For example, when RU106 is used, the RU106 located on the leftmost side can be used. For example, when RU106 + RU26 is used, the RU106 located on the leftmost side and the RU26 located fifth from the leftmost side can be used. The position of the preset RU (i.e., RU106 or RU106 + RU26) can be changed.

[0294] Feature 1.g.iii.1.b. In the above example, since the position of the RU is fixed (or pre-configured), additional indication or signaling for the RU position can be omitted.

[0295] Feature 1.g.iii.1.c. For signals transmitted using the fixed RU position, power boosting can be applied within a 20 MHz band considering the corresponding RU size.

[0296] Feature 1.g.iii.2. For example, the repetition within 20 MHz technique described below can be used.

[0297] Feature 1.g.iii.2.a. For example, when the RU size used based on the ER PPDU (e.g., the RU size indicated by the ER allocation field) is determined, the corresponding RU can be repeated within a specific band (e.g., a 20 MHz band). For example, when a 106-tone RU is used for the ER PPDU (i.e., when a 106-tone RU is indicated by the ER allocation field), two 106-tone RUs can be allocated within 20 MHz. Thus, the 106-tone RU can be duplicated / repeated in frequency within the 20 MHz band.

[0298] Feature 1.g.iii.2.b. According to the above example, since the same data is repeated / duplicated in RUs of the same size, there is an advantage of generating diversity and repetition gain.

[0299] Feature 1.g.iv. Additionally or alternatively, when constructing the ER PPDU, it is possible to repeat the data signal in 20 MHz units.

[0300] Feature 1.g.iv.1. In a specific band (e.g., 6GHz band), wide bandwidth transmission can be considered, so the ER PPDU can also be transmitted via wide bandwidth. For example, when the ER PPDU is transmitted within the wide bandwidth, data (e.g., user data or payload) can be assigned to 242-tone RUs. In this case, the 242-tone RUs can be repeated / replicated within the BW.

[0301] Feature 1.g.iv.2. Hereinafter, an example of using an 80MHz ER PPDU will be described.

[0302] Feature 1.g.iv.2.a. FIG. 24 shows an example where the data field is repeated for wide bandwidth transmission. As shown, the 242-tone RU is repeated / replicated, and a total of 4 identical 242-tone RUs can be transmitted.

[0303] Feature 1.g.iv.2.b. In the above example, DCM can be applied to the data field. For example, the 242-tone RU in FIG. 24 is an RU to which DCM is applied.

[0304] Feature 1.g.iv.2.c. In the above example, the STF and LTF (i.e., EHT-STF and EHT-LTF) can be configured using sequences corresponding to the full bandwidth. For example, as shown in FIG. 24, when repetition / replication is applied to the data field of the 80MHz PPDU, it is preferable to use the EHT-STF sequence and the EHT-LTF sequence pre-set for 80MHz.

[0305] Feature 1.g.iv.2.d. By another example, it is possible to set the STF and LTF sequences based on 20 MHz. That is, it is possible to use the pre-set EHT-STF sequence and EHT-LTF sequence for the 20 MHz band.

[0306] Feature 1.g.iv.2.e. When the data field is replicated / repeated, a problem of increased PAPR can occur. Phase rotation can be applied to the 20 MHz frequency segment to reduce PAPR. That is, phase rotation can be applied to the data field. For example, each element of the phase rotation sequence for phase rotation can be selected as one from {1, -1, j, -j}.

[0307] Feature 1.g.iv.2.e.i. For example, a phase rotation sequence of [1 -1 -1 -1] can be applied for the data field of an 80 MHz ER PPDU.

[0308] Feature 1.g.iv.2.e.ii. For example, a phase rotation sequence of [1 -1 -1 -1 1 -1 -1 -1] can be applied for the data field of a 160 MHz ER PPDU.

[0309] Feature 1.g.iv.2.e.iii. The above-described phase rotation operation can be applied to the STF / LTF of the ER PPDU. Specifically, when the STF / LTF of the ER PPDU is repeated in the same manner as the data field, the phase rotation for the data field can also be applied to the STF / LTF.

[0310] Feature 1.g.v. The size of the RU used in the above-described example, the number of repeated / copied RUs, and the bandwidth of the PPDU are deformable. For example, the data field can be repeated / copied in units of 20 / 40 / 80 / 160 MHz. That is, for the data field of the ER PPDU, RUs with various tones (e.g., 242 / 484 / 996 / 2x996) can be replicated / repeated.

[0311] Feature 1.g.v.1. For example, when the total bandwidth of the ER PPDU is N, the size of one RU included in the data field of the ER PPDU is set based on N / 2, and the corresponding RU is preferably replicated / repeated in frequency. The bandwidth can be variously set such as 80 / 160 / 320 MHz, and the size of one RU can also be variously set such as 484 / 996 / 2x996-tone RU.

[0312] Feature 1.g.v.1.a. For example, when configuring a 40 MHz ER PPDU, one RU for the data field can be set based on a 20 MHz bandwidth. That is, it is preferable that the 242-tone RU corresponding to the 20 MHz bandwidth is included in the data field and replicated / repeated in frequency. For example, when configuring an 80 MHz ER PPDU, one RU for the data field can be set based on a 40 MHz bandwidth. That is, it is preferable that the 484-tone RU corresponding to the 40 MHz bandwidth is included in the data field and replicated / repeated in frequency.

[0313] Feature 1.g.v.1.b. When replicating / repeating one RU as described above, the reception performance can be improved by about 3 dB. Thereby, the effect of expanding the transmission / reception range can be obtained.

[0314] Feature 1.g.v.1.c. As described above, when the RU included in the data field is repeated / duplicated, the STF / LTF (e.g., EHT-STF / EHT-LTF) is preferably set based on the total bandwidth of the ER PPDU. For example, when an 80 MHz ER PPDU is configured, the data field uses a 484-tone RU instead of a 996-tone RU, but the STF / LTF preferably uses a sequence with an 80 MHz bandwidth instead of a 40 MHz bandwidth. In other words, the STF / LTF is preferably configured based on the STF / LTF sequence (e.g., 80 MHz EHT-STF / LTF sequence) preset for the total bandwidth of the PPDU (e.g., 80 MHz).

[0315] Also, when a 160 MHz ER PPDU is configured, the data field uses a 996-tone RU instead of 2 * 996-tone RUs, but the STF / LTF preferably uses a sequence with a 160 MHz bandwidth instead of an 80 MHz bandwidth. In other words, the STF / LTF is preferably configured based on the STF / LTF sequence (e.g., 160 MHz EHT-STF / LTF sequence) preset for the total bandwidth of the PPDU (e.g., 160 MHz).

[0316] Also, when a 320 MHz ER PPDU is configured, the data field uses 2 * 996-tone RUs instead of 4 * 996-tone RUs, but the STF / LTF preferably uses a sequence with a 320 MHz bandwidth instead of a 160 MHz bandwidth. In other words, the STF / LTF is preferably configured based on the STF / LTF sequence (e.g., 320 MHz EHT-STF / LTF sequence) preset for the total bandwidth of the PPDU (e.g., 320 MHz).

[0317] FIG. 25 is an example of an ER PPDU including an STF / LTF field set based on the overall bandwidth. As shown, the total bandwidth of the ER PPDU is 80 MHz, whereby a 484-tone RU is included in the data field and the corresponding 484-tone RU is replicated in frequency. That is, an RU corresponding to half of the total bandwidth (i.e., 40 MHz) is allocated to the data field. However, the STF / LTF is configured based on the STF / LTF sequence already set for the total bandwidth, i.e., the 80 MHz EHT-STF / LTF sequence.

[0318] Feature 1.g.v.1.d. Additionally or alternatively, when the RU included in the data field is repeated / replicated, the STF / LTF (e.g., EHT-STF / EHT-LTF) can also be repeated / replicated in the same manner as the RU. For example, when configuring an 80 MHz ER PPDU, the STF and LTF can be set based on the sequence already set for a 40 MHz bandwidth. The corresponding STF / LTF can be replicated in frequency.

[0319] When STF / LTF is replicated in the same way as RU, the following problems can occur. For example, if the total bandwidth of an ER PPDU is 80 MHz and the STF / LTF is based on a 20 / 40 MHz sequence, additional indication / signaling regarding the fact that the STF / LTF is generated and repeated based on a partial bandwidth that is not the total bandwidth is required. Also, the tone allocation (or RU location) related to the total bandwidth may not be exactly aligned with the tone allocation (or RU allocation) related to the partial bandwidth. For example, the 80 / 160 / 320 MHz tone allocation defined in a wireless LAN system does not exactly match the 20 MHz tone allocation. Therefore, when using a 20 MHz STF / LTF sequence while transmitting an 80 / 160 / 320 MHz ER PPDU, the performance of channel estimation can be degraded for some tones. Thus, it is preferable that the STF / LTF is generated based on the overall bandwidth as shown in FIG. 25.

[0320] Feature 1.g.v.1.d.i. To reduce the PAPR problem increased by the replication of RU, it is preferable that phase rotation is applied. For example, phase rotation can be applied to the data field, STF, and / or LTF. The phase rotation operation can be applied in units of duplicated BW / RU.

[0321] Feature 1.g.v.1.d.ii. For example, when replicated in units of 40 MHz (or 80 MHz) for an 80 MHz (or 160 MHz) ER PPDU, phase rotation can be performed in units of 40 MHz (or 80 MHz). In this case, phase rotation sequences such as [1 j], [1 -1], [-1 1], [1 -j], etc. can be used.

[0322] Feature 1.g.v.1.e. For example, the transmission format (or duplication format) of the ER PPDU can be indicated via sub-fields of the U-SIG field. For example, it can be indicated via the BW field and / or the PPDU-type field within the U-SIG field. For example, when an 80 MHz ER PPDU is transmitted, the BW field can have a pre-set value for 80 MHz, and the PPDU-type field can have a pre-set value (e.g., 11) for the Extended Range format (or duplication format). The receiving STA can know that the received PPDU is an 80 MHz signal via the BW field of the received PPDU, and can know that the received PPDU is an ER PPDU (i.e., an ER PPDU in which a 484-tone RU corresponding to 40 MHz is frequency-duplicated) via the type field.

[0323] Feature 1.g.v.2. The specific RU sizes, bandwidths, etc. described above can be modified. That is, various Repetition granularity (or duplication granularity) can be considered for the ER PPDU.

[0324] Feature 1.g.v.2.a. For example, the Repetition granularity can consider 20 / 40 / 80 / 160 MHz sub-channel or 242 / 484 / 996 / 2x996-tone.

[0325] When various Repetition granularities are supported in Feature 1.g.v.2.b, additional information is required to indicate the granularity. For example, information regarding Repetition granularity can be indicated via 2-bit information as follows. The following 2-bit information can be included in the first control signal field (e.g., U-SIG field) or the second control signal field (e.g., EHT-SIG field).

[0326]

Table 16

[0327] For example, when the 2-bit information has a first value (e.g., 00), the RU of the ER PPDU can be repeated / copied in units of 20 MHz (or, in units of 242 tones). For example, as in an example of FIG. 25, when repeated / copied in units of 20 MHz (or, in units of 242 tones), that is, when the Repetition granularity is 40 MHz (or, 484 tones), the second bit information can have a second value (e.g., 01).

[0328] Feature 1.g.v.2.c. The 2-bit information can be configured in a manner that re-uses an existing field within the first / second control signal field or defines a new entry in the existing field. For example, the following methods can be considered.

[0329] Feature 1.g.v.2.c.i. For the robust transmission of the ER PPDU, it is preferable that an MCS technique based on a low MCS level is applied to the ER PPDU. For example, for the data field of the ER PPDU, only the modulation of BPSK and QPSK techniques can be applied, whereby only a low MCS level (e.g., the conventional MCS0, MCS1, MCS2 levels) can be considered. For example, when the MCS field is composed of 4 bits (b0, b1, b2, b3), the MSB 2 bits (i.e., b0, b1) can include information regarding the duplication / repetition granularity, and the LSB 2 bits (i.e., b2, b3) can include information regarding the MCS. That is, since only a limited number of modulation techniques such as a low MCS level are used, it is possible to indicate information regarding the MCS only through the LSB 2 bits. The length of the MCS field can be changed and can be included within the first / second control signal fields.

[0330] Feature 1.g.v.2.c.ii. As another example, only MCS0 can be fixedly used for the data field of the ER PPDU. In this case, the MCS field can be used to indicate the duplication / repetition granularity. Also, only some entries of the MCS field value can include information related to the duplication / repetition granularity. For example, the PPDU type field includes a preset value indicating the ER PPDU, and some entries (e.g., 0: 20MHz, 1: 40MHz, 2: 80MHz, 3: 160MHz, 4 - 15: reserved) of the value of the MCS field can include information related to the duplication / repetition granularity.

[0331] Feature 1.g.v.2.c.iii. For example, the spatial stream (SS) for the transmission of an ER PPDU can be fixedly used as 1. Information regarding the number of said SSs (i.e., NSTS or Number of Space Time Stream) can be included within the first / second control signal field. Thereby, the subfield regarding the conventional NSTS can be used to indicate the duplication / repetition granularity. Thereby, the subfield regarding NSTS included within the first / second control signal field can indicate the duplication / repetition granularity during the transmission of an ER PPDU and can include information regarding the number of said SSs during the transmission of different types of PPDUs that are not ER PPDUs.

[0332] Feature 1.g.v.2.c.iii.1. For example, when an ER PPDU is transmitted, the subfield including information regarding NSTS can indicate the duplication / repetition granularity (0: 20 MHz, 1: 40 MHz, 2: 80 MHz, 3: 160 MHz, 4 - 15: reserved) via a specific value.

[0333] Feature 1.g.v.3. In order to reduce the signaling overhead associated with the such duplication unit (i.e., duplicated RU) and / or ER PPDU, the duplication BW / RU used for the ER PPDU can be fixed to one.

[0334] Feature 1.g.v.3.a. For example, in order to guarantee the minimum data rate, the size of the said duplicated unit can be 20 / 40 / 80 MHz.

[0335] Feature 1.g.v.3.b. For example, when transmitting an ER PPDU via a wide bandwidth, the duplicated unit included in the corresponding PPDU can be repeated / copied in terms of frequency. For example, when an RU corresponding to 40 MHz (i.e., a 484-tone RU) is included in a PPDU with a total bandwidth of 80 / 160 / 320 MHz, the corresponding RU can be repeated / copied 2 / 4 / 8 times in 40 MHz units.

[0336] Feature 1.g.v.3.c. In the above case, the STF and LTF included in the corresponding PPDU are not determined by the size of one RU, but can be set based on the pre-set STF / LTF sequence for the total bandwidth of the corresponding PPDU.

[0337] Feature 1.g.v.3.d. Different from the above, STF and LTF can also be repeated and transmitted in units of the duplicated unit. For example, when duplicating in 40 MHz units, STF and LTF are composed of a 40 MHz sequence and repeated and transmitted within the BW.

[0338] Feature 1.g.v.4. For example, in an IEEE802.11be system, 80 MHz transmission can be the main unit. Accordingly, the ER PPDU can also be applied only to an 80 MHz BW. In this case, the data field included in the corresponding ER PPDU is replicated / repeated in terms of frequency in 20 / 40 MHz units, and as a result, the same data field can be included 4 / 2 times.

[0339] Feature 1.g.v.4.a. Even when a PPDU having an 80 MHz bandwidth is used as described above, as described above, the EHT-STF included in the corresponding PPDU is preferably configured based on an 80 MHz STF sequence, and the ETH-LTF included in the corresponding PPDU is preferably configured based on an 80 MHz LTF sequence.

[0340] Feature 1.g.v.4.b. Alternatively, it is also possible to repeat the STF / LTF in the same manner as the data field in order to obtain the combine gain for the STF and LTF. That is, in order to construct the STF / LTF, STF / LTF signals can be generated based on the 20 / 40 MHz sequence and repeated 4 / 2 times in frequency.

[0341] Feature 1.g.v.4.c. For example, when a specific unit (e.g., data RU, STF, LTF) is repeated / copied in frequency, the PAPR can increase. To solve this, when the specific unit is repeated / copied in 20 / 40 MHz units, a specific phase rotation sequence can be applied to the repeated / copied unit. For example, [1 -1 -1 -1] can be applied to the unit repeated / copied in 20 MHz units, and [1 j] can be applied to the unit repeated / copied in 40 MHz units.

[0342] Feature 1.g.v.4.d. In one example above, when a specific unit is repeated / copied in 20 MHz units, it is possible to transmit signals based on the repetition / copying only for the Primary 40 MHz band / channel for power boosting.

[0343] Feature 1.g.v.4.e. FIG. 26 shows an example of a PPDU that performs repetition / copying only for a specific unit. As shown, a specific unit (i.e., data RU, STF, LTF) can be repeated / copied in frequency in 20 MHz units. In this case, as shown, the corresponding unit is transmitted only for the Primary 40 MHz band / channel, and power boosting can be applied to the transmitted unit. The power boosting for the unit can be performed by about NdB (e.g., 1 / 2 / 3 dB).

[0344] Feature 1.g.v.5. The above-described example can be variously modified. For example, instead of the Primary 40 MHz band / channel, the PPDU can be configured based only on the Primary 20 MHz band / channel.

[0345] Feature 1.g.v.5.a. FIG. 27 shows an example of configuring a PPDU based on a specific frequency band / channel. As shown, the STF / LTF / data-field can be configured only for a specific frequency band / channel (i.e., the Primary 20 MHz band / channel), and power boosting can be applied (e.g., power boosting based on N dB) to the STF / LTF / data-field.

[0346] Feature 1.g.v.5.b. As described above, the DCM technique can be applied to the data field of the PPDU according to this specification. Accordingly, the 242-tone RU in FIGS. 26 / 27 is an RU to which the DCM technique is applied.

[0347] The various technical features described above can be combined with the technical features described below.

[0348] Feature 2. The ER PPDU of this specification can be applied only to the Primary 80 MHz region / channel. For example, the ER PPDU is transmitted only in the 80 MHz region / channel, and the corresponding PPDU includes replicated / repeated RUs, but some fields (e.g., the STF / LTF / data-field) are not omitted. In other words, preamble puncturing is not supported for the ER PPDU of this specification. In other words, full bandwidth transmission is considered for the ER PPDU of this specification.

[0349] Feature 2.a. Additionally or alternatively, some fields within the ER PPDU (e.g., STF / LTF / data-field) can be repeated / duplicated in 80 MHz units. For example, some fields of a 160 MHz ER PPDU (e.g., STF / LTF / data-field) can be repeated in 80 MHz units to include a total of 2 data fields, and some fields of a 320 MHz ER PPDU (e.g., STF / LTF / data-field) can be repeated in 80 MHz units to include a total of 4 data fields.

[0350] Feature 3. A low MCS level (e.g., MCS0) and 1 spatial stream can be applied to the ER PPDU (e.g., data field) in this specification.

[0351] Feature 3.4. As described above, the Repetition granularity (or, duplication granularity) can be determined in various ways. When a 20 MHz granularity is used, 242-RU tones can be used within the data-field. When 40 / 80 / 160 MHz granularities are used, 484 / 996 / 2x996-tone RUs can be used within the data-field.

[0352] Feature 3.5. For the aforementioned extended range transmission, i.e., the BSS can be configured as an extended range BSS for the transmission of the ER PPDU. The EHT-beacon or 11be beacon according to the EHT standard for the ER BSS configuration can be repeated / duplicated in frequency as described above. The duplicated PPDU format that is repeated / duplicated can be configured using the EHT frame format (i.e., 11be frame format).

[0353] In an example of this specification, the following operations can be executed at the STA.

[0354] FIG. 28 is a flowchart for explaining an operation executed by a transmitting STA. The transmitting STA that executes the operation of FIG. 28 is an AP STA or a non-AP STA.

[0355] The transmitting STA can configure a PPDU for the above-described ER transmission (S2810). The PPDU for the ER transmission is the above-described ER PPDU. As described above, the ER PPDU can be called by various names and can also be called a PPDU related to a duplicate transmission mode or EHT duplicate transmission.

[0356] The transmitting STA configures a transmission PPDU (e.g., the above-described ER PPDU) according to an example of this specification. The transmission PPDU can include a first control signal field, an STF (short training field), an LTF (long training field), and a data field for interpreting the transmission PPDU. For example, the first control signal field is the U-SIG field, and the second control signal field is the EHT SIG field.

[0357] For example, the first control signal field is the U-SIG field of an EHT MU PPDU. The U-SIG field is composed of two symbols (i.e., U-SIG-1 and U-SIG-2), and the first symbol (U-SIG-1) contains a total of 26 bits composed of bits B0 to B25. On the first symbol (U-SIG-1), bits B0 to B2 are the PHY Version Identifier and can contain information about the PHY version of the transmitted PPDU, bits B3 to B5 contain bandwidth information, bit B6 contains the UL / DL indicator, bits B7 to B12 contain the BSS identification information for the transmitted PPDU, bits B13 to B19 contain the duration information of the TXOP related to the transmitted PPDU, and the duration of the TXOP can be used for the NAV setting of other STAs. Also, bits B20 to B25 can be used for functions defined later. Also, within the second symbol (U-SIG-2), bits B0 to B1 contain information about the PPDU type and / or information about the compression mode, bit B2 can be used for functions defined later, bits B3 to B7 contain information about the punctured channel, bit B8 can be used for functions defined later, bits B9 to B10 can contain the MCS information applied to the second control signal field (e.g., the EHT SIG field), bits B11 to B15 contain information related to the number of symbols for transmitting the second control signal field, bits B16 to B19 contain the CRC (i.e., the CRC calculated based on the total 26 bits of U-SIG-1 and bits B0 to B15 of U-SIG-2), and bits B20 to B25 can contain the Tail bits for BCC coding.

[0358] Additionally or alternatively, the first control signal field is a U-SIG field based on an ER preamble. The U-SIG field based on the ER preamble can include all or part of the U-SIG field of the EHT MU PPDU.

[0359] The U-SIG field of the EHT MU PPDU is transmitted via a total of two symbols (e.g., two 4us symbols), and each symbol can be configured based on BPSK constellation mapping. In contrast, the U-SIG field of the ER preamble is transmitted via a total of four symbols (e.g., four 4us symbols), U-SIG-1 is repeatedly transmitted via two symbols (the second symbol out of the total four symbols), and U-SIG-2 can also be repeatedly transmitted via two symbols (the fourth symbol out of the total four symbols). In this case, BPSK constellation mapping is applied to the first / third / fourth symbols out of the total four symbols, and QBPSK constellation mapping (i.e., mapping rotated 90 degrees counterclockwise with respect to BPSK) can be applied to the second symbol.

[0360] For example, the first control signal field (i.e., the U-SIG field) can include a type field that includes a type value related to the duplicate transmission mode. For example, the type field is bits B0 to B1 of the U-SIG-2. The receiving STA can know that an ER PPDU is received via the type field (i.e., that the transmitting STA transmits a PPDU based on the duplicate transmission mode). On the other hand, the type field is only an example of a signaling technique for indicating the ER PPDU, and it is also possible to indicate the ER PPDU by other methods other than the type field.

[0361] More specifically, when the B6 bit of the U-SIG-1 (i.e., the UL / DL indicator) has a preset value for DL (e.g., "0") and the B0 to B1 bits of the U-SIG-2 (i.e., the PPDU type field described above) have a specific first value (e.g., "1"), the corresponding PPDU can be indicated to be used for a single user or for an NDP (null data packet). Also, when the ER PPDU is transmitted (i.e., when the duplicate transmission mode is used), the B0 to B1 bits of the U-SIG-2 (i.e., the PPDU type field described above) can have the first value (e.g., "1"). As a result, as described above, one entry of the PPDU type field can be used for the ER PPDU.

[0362] When the B0 to B1 bits of the U-SIG-2 (i.e., the PPDU type field described above) have the first value (e.g., "1"), the second control signal field (i.e., the EHT-SIG field) does not include a sub-field for RU allocation.

[0363] On the other hand, when the transmit-receive PPDU is used for DL OFDMA communication that is not an ER PPDU, the B0 to B1 bits of the U-SIG-2 (i.e., the PPDU type field described above) can have a second value (e.g., "0"). In this case, the second control signal field (i.e., the EHT-SIG field) includes a sub-field for RU allocation.

[0364] On the one hand, when the transmitted and received PPDU is used for DL MU-MIMO (i.e., non-OFDMA) communication that is not an ER PPDU, the B0 to B1 bits of the U-SIG-2 (i.e., the PPDU type field described above) can have a third value (e.g., "2"). In this case, the second control signal field (i.e., the EHT-SIG field) does not include a sub-field for RU allocation.

[0365] The first control signal field (i.e., the U-SIG field) can be duplicated per 20MHz on frequency as in an example of FIG. 24.

[0366] When the ER PPDU of this specification is transmitted, the second control signal field (i.e., the EHT-SIG field) can be transmitted based on the EHT-SIG content channel. One EHT-SIG content channel can occupy a 20MHz band. Also, as in an example of FIG. 24, one EHT-SIG content channel can be duplicated per 20MHz on frequency. For example, one EHT-SIG content channel can include a common field and a user specific field. The common field can include the overflowed information, and for example, can include additional control information (e.g., information regarding the number of receiving STAs). The user specific field can include control information for the receiving STA that receives the ER PPDU.

[0367] The data field can include a first data RU including tones for half of the total bandwidth of the transmitted PPDU and a second data RU in which the first data RU is duplicated in frequency. For example, as shown in FIG. 25, when an 80 MHz PPDU is transmitted, the first data RU is a 484-tone RU. Also, when a 160 MHz PPDU is transmitted, the first data RU is a 996-tone RU. Also, when a 320 MHz PPDU is transmitted, the first data RU is a 2*996-tone RU. That is, when the total bandwidth is 80 MHz, the data RU including tones for half of the 80 MHz bandwidth is a 484-tone RU. Also, when the total bandwidth is 160 MHz, the data RU including tones for half of the 160 MHz bandwidth is a 996-tone RU. Also, when the total bandwidth is 320 MHz, the data RU including tones for half of the 320 MHz bandwidth is a 2*996-tone RU.

[0368] For example, partial phase rotation for PAPR reduction can be applied to the duplicated second data RU. For example, it is possible to multiply -1 to the first half of the tones of the second data RU and +1 to the remaining half of the tones. In other words, [-1 1]-based phase rotation can be applied to the duplicated second data RU.

[0369] It is preferable that a low-level MCS technique is applied to each of the first and second data RUs. For example, each of the first and second data RUs can be modulated based on the BPSK technique. Also, it is preferable that a DCM (dual carrier modulation) technique is applied to each of the first and second data RUs. That is, since DCM, BPSK, and frequency replication are all applied to the data RUs included in the ER PPDU of this specification, more robust transmission can be supported compared to the prior art. Also, LDPC coding can be applied to each of the first and second data RUs. Also, each of the first and second data RUs can be transmitted via one spatial stream.

[0370] Information regarding the MCS, coding, number of streams, etc. applied to each of the first and second data RUs can be included in the user field of the aforementioned user specific field. The user field can include various control bits. For example, within the user field, bits B0 to B10 include identification information regarding the receiving STA of the ER PPDU, bits B11 to B14 include preset values for indicating BSPK and DCM applied to the ER PPDU, bits B16 to B19 include information regarding the number of spatial streams applied to the ER PPDU (i.e., a preset value for indicating one stream), bit B20 includes information related to beamforming applied to the ER PPDU, and bit B21 can include a preset value for indicating LDPC coding applied to the ER PPDU.

[0371] The STF can be configured based on the pre - set STF sequence for the total bandwidth of the PPDU. For example, when the total bandwidth of the ER PPDU is 80 MHz, the STF can be configured based on the STF sequence pre - set for the 80 MHz bandwidth. That is, the coefficients of the STF sequence for the 80 MHz bandwidth exist every 16 sub - carriers from sub - carrier index - 496 to sub - carrier index 496, and can be expressed as STF Sequence_(-496:16:496)={M, 1, -M, 0, -M, 1, -M}*(1 + j) / SQRT(2). For example, the M sequence can be defined as {-1, -1, -1, 1, 1, 1, -1, 1, 1, 1, -1, 1, 1, -1, 1}. Also, when the total bandwidth of the ER PPDU is 160 / 320 MHz, the STF can be configured based on the STF sequence pre - set for the 160 / 320 MHz bandwidth.

[0372] The LTF can also be configured based on the pre - set LTF sequence for the total bandwidth of the PPDU. For example, when the total bandwidth of the ER PPDU is 80 MHz, the LTF can be configured based on the LTF sequence pre - set for the 80 MHz bandwidth. Also, when the total bandwidth of the ER PPDU is 160 / 320 MHz, the LTF can be configured based on the LTF sequence pre - set for the 160 / 320 MHz bandwidth.

[0373] The transmitting STA can transmit the PPDU configured by the method described above via the 6 GHz band (S2820). The PPDU can be transmitted via the full band without preamble puncturing being performed.

[0374] The operations of FIG. 28 can be executed by the apparatuses of FIGS. 1 and / or 14. For example, the transmitting STA can be implemented by the apparatuses of FIGS. 1 and / or 14. The processors of FIGS. 1 and / or 14 can execute the operations of FIG. 28 described above. Also, the transceivers of FIGS. 1 and / or 14 can execute the operations described in FIG. 28.

[0375] Also, the apparatus proposed in this specification does not necessarily need to include a transceiver and can be implemented in the form of a chip including a processor and a memory. Such an apparatus can generate / store a transmitting PPDU according to an example described above. Such an apparatus can be connected to a separately manufactured transceiver to actually support transmission and reception.

[0376] FIG. 29 is a flowchart for explaining operations executed by a receiving STA. The operations of FIG. 29 can be executed by a user STA or an AP STA.

[0377] As illustrated, the receiving STA can receive a received PPDU (physical protocol data unit) (S2910). The received PPDU means a PPDU configured for the ER transmission, the ER PPDU, or a PPDU configured based on the duplicate transmission mode.

[0378] The receiving STA can decode the received PPDU (physical protocol data unit) based on the first control signal field (and / or the second control signal field) (S2920). For example, the first control signal field includes various information regarding the version of the PPDU, the bandwidth of the PPDU, the type of the PPDU, the second control signal field, etc. as described above. The receiving STA can start decoding the received PPDU based on the information in the first control signal field. Additionally, the receiving STA can decode the second control signal field based on various information (e.g., MCS information regarding the data field, etc.) included in the second control signal field, and based on this, can decode the user data included in the data field.

[0379] This specification proposes a computer readable medium that can be embodied in various forms. The computer readable medium according to this specification can be encoded with at least one computer program including instruction words. The instruction words stored in the medium can control the processor described in FIG. 1 and / or FIG. 14, etc. That is, the instruction words stored in the medium control the processor presented in this specification and execute the operations of the transmitting and receiving STA described above (e.g., the operations in FIGS. 28 to 29).

[0380] The technical features of this specification described above are applicable to various applications and business models. For example, the technical features described above can be applied to wireless communication in a device that supports artificial intelligence (AI).

[0381] Artificial intelligence refers to the field of studying artificial intelligence or the methodologies that can create it. Machine learning refers to the field of defining various problems addressed in the field of artificial intelligence and researching the methodologies for solving them. Machine learning can also be defined as an algorithm that enhances the performance of a task through continuous experience with that task.

[0382] An artificial neural network (ANN) is a model used in machine learning, which can generally refer to a model with problem-solving capabilities composed of artificial neurons (nodes) that form a network through synaptic connections. An artificial neural network can be 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.

[0383] 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 each other. In an artificial neural network, each neuron can output the function value of the activation function for the input signal, weight value, and bias input through the synapse.

[0384] Model parameters refer to parameters determined through learning, including weight values of synaptic connections and biases of neurons. Hyperparameters refer to parameters that must be set before learning in machine learning algorithms, including learning rate, number of iterations, mini-batch size, initialization function, etc.

[0385] The purpose of artificial neural network learning can be regarded as determining model parameters that minimize the loss function. The loss function can be used as an indicator for determining optimal model parameters in the artificial neural network learning process.

[0386] Machine learning can be classified into supervised learning, unsupervised learning, and reinforcement learning according to the learning method.

[0387] Supervised learning means a method of training an artificial neural network with labels given for the training data. A label can mean the correct answer (or result value) that the artificial neural network should infer when the training data is input to the artificial neural network. Unsupervised learning can mean a method of training an artificial neural network without labels given for the training data. Reinforcement learning can mean a learning method in which an agent defined in an environment is trained to select actions or action sequences that maximize cumulative rewards in each state.

[0388] Machine learning realized by a deep neural network (DNN) with multiple hidden layers in an artificial neural network is sometimes called deep learning. Deep learning is a part of machine learning. In the following, machine learning is used to mean including deep learning.

[0389] Also, the above-described technical features can be applied to wireless communication of robots.

[0390] A robot can mean a machine that automatically processes or operates a given task by its own possessed capabilities. In particular, a robot having a function of recognizing the environment, making its own judgment, and performing actions can be called an intelligent robot.

[0391] Robots can be classified into industrial, medical, household, military, etc. according to their usage purposes and fields. Robots are equipped with a drive unit having an actuator or a motor and can perform various physical operations such as moving robot joints. Also, movable robots include wheels, brakes, propellers, etc. in the drive unit and can travel on the ground or fly in the air through the drive unit.

[0392] Also, the above-described technical features can be applied to a device for supporting extended reality.

[0393] 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 a CG image created virtually on an actual object image, and MR technology is a computer graphic technology that mixes and combines virtual objects with the real world and provides them.

[0394] MR technology is similar to AR technology in that it shows both real objects and virtual objects. However, there is a difference in that in AR technology, virtual objects are used in a form that complements real objects, while in MR technology, virtual objects and real objects are used with equal status.

[0395] XR technology can be applied to HMD (Head-Mount Display), HUD (Head-Up Display), mobile phones, tablet PCs, laptops, desktops, TVs, digital signage, etc., and a device to which XR technology is applied can be called an XR device (XR Device).

Claims

1. In a method performed by a transmitting STA (Station) of a wireless LAN (Local Area Network), a step of configuring a PPDU (physical protocol data unit) based on a duplicate transmission mode, wherein the PPDU includes a U-SIG (universal signal) field for interpreting the PPDU, an EHT-SIG (extremely high throughput signal) field that includes an MCS (modulation and coding scheme) field and is consecutive to the U-SIG field, a STF (short training field) consecutive to the EHT-SIG field, a LTF (long training field) consecutive to the STF, and a data field consecutive to the LTF, wherein the U-SIG field includes a PHY version identifier having a length of 3 bits related to the PHY (physical) version of the PPDU, wherein the U-SIG field further includes a type field having a type value related to the duplicate transmission mode, wherein the PPDU is an 80 MHz PPDU, wherein the U-SIG field is replicated on each 20 MHz subchannel within the 80 MHz PPDU, wherein the EHT-SIG field includes a content channel that is replicated on each 20 MHz subchannel within the 80 MHz PPDU, wherein the data field includes a first 484-tone RU (resource unit) and a second 484-tone RU, wherein the first 484-tone RU is replicated to the second 484-tone RU, wherein the STF is configured based on an STF sequence already set for 80 MHz, wherein the LTF is configured based on an LTF sequence already set for 80 MHz, and a step of transmitting the PPDU. A method comprising these steps.

2. The method according to claim 1, wherein the STF is an EHT (extremely high throughput)-STF, and the LTF is an EHT-LTF.

3. The method according to claim 1, wherein the first 484-tone RU includes user data for a single user.

4. The method according to claim 1, wherein the first 484-tone RU is modulated based on a BPSK (Binary Phase Shift Keying) technique and a DCM (dual carrier modulation) technique.

5. The PPDU is an EHT PPDU, The type field has a length of 2 bits, The type field, A first value related to the duplicate transmission mode, A second value related to DL (downlink) OFDMA (orthogonal frequency division multiple access) transmission, and The method according to claim 1, having a third value related to non-OFDMA DL MU-MIMO (multi-user multiple input multiple output) transmission.

6. The method according to claim 1, wherein the PPDU is transmitted via the 6 GHz band without preamble puncturing.

7. In a method performed by a receiving STA (Station) of a wireless LAN (Local Area Network), Receiving a PPDU (physical protocol data unit), wherein The PPDU is configured based on a duplicate transmission mode, The PPDU, A U-SIG (universal signal) field for interpreting the PPDU, An EHT-SIG (extremely high throughput signal) field including an MCS (modulation and coding scheme) field and consecutive to the U-SIG field, An STF (short training field) consecutive to the EHT-SIG field, An LTF (long training field) consecutive to the STF, and A data field consecutive to the LTF, The U-SIG field includes a PHY version identifier having a length of 3 bits related to the PHY (physical) version of the PPDU, The U-SIG field further includes a type field having a type value related to the duplicate transmission mode, The PPDU is an 80 MHz PPDU, The U-SIG field is replicated on each 20 MHz subchannel within the 80 MHz PPDU. The EHT-SIG field includes content channels replicated on each 20 MHz subchannel within the 80 MHz PPDU, the data field includes a first 484-tone RU (resource unit) and a second 484-tone RU, the first 484-tone RU is replicated to the second 484-tone RU, the STF is configured based on an STF sequence already set for 80 MHz, the LTF is configured based on an LTF sequence already set for the 80 MHz, step, decoding the PPDU based on the U-SIG field, and a method. **Claim 8** the PPDU is an EHT (extremely high throughput) PPDU, the type field has a length of 2 bits, the type field is a first value related to the replicated transmission mode, a second value related to DL (downlink) OFDMA (orthogonal frequency division multiple access) transmission, and a third value related to non-OFDMA DL MU-MIMO (multi-user multiple input multiple output) transmission, the method according to claim 7. **Claim 9** In a transmitting STA (Station) of a wireless LAN (Local Area Network), a transceiver for transmitting a wireless signal, and a processor for controlling the transceiver, including the processor configures a PPDU (physical protocol data unit) based on a replicated transmission mode, the PPDU a U-SIG (universal signal) field for interpreting the PPDU, an EHT-SIG (extremely high throughput signal) field including an MCS (modulation and coding scheme) field and consecutive to the U-SIG field, an STF (short training field) consecutive to the EHT-SIG field, an LTF (long training field) consecutive to the STF, and a data field consecutive to the LTF. The U-SIG field includes a PHY version identifier having a length of 3 bits related to the PHY (physical) version of the PPDU, the U-SIG field further includes a type field having a type value related to the duplicate transmission mode, the PPDU is an 80 MHz PPDU, the U-SIG field is replicated on each 20 MHz subchannel within the 80 MHz PPDU, the EHT-SIG field includes a content channel that is replicated on each 20 MHz subchannel within the 80 MHz PPDU, the data field includes a first 484-tone RU (resource unit) and a second 484-tone RU, the first 484-tone RU is replicated to the second 484-tone RU, the STF is configured based on an STF sequence already set for 80 MHz, the LTF is configured based on an LTF sequence already set for 80 MHz, a transmitting STA adapted to transmit the PPDU via the transceiver.

10. the PPDU is an EHT (extremely high throughput) PPDU, the type field has a length of 2 bits, the type field is a first value related to the duplicate transmission mode, a second value related to DL (downlink) OFDMA (orthogonal frequency division multiple access) transmission, and a third value related to non-OFDMA DL MU-MIMO (multi-user multiple input multiple output) transmission, the transmitting STA according to claim 9.

11. In a receiving STA (Station) of a wireless LAN (Local Area Network), a transceiver for transmitting a wireless signal, and a processor for controlling the transceiver, the processor is receiving a PPDU (physical protocol data unit) via the transceiver, the PPDU is configured based on a duplicate transmission mode, the PPDU is a U-SIG (universal signal) field for interpreting the PPDU, An EHT-SIG (extremely high throughput signal) field that includes an MCS (modulation and coding scheme) field and is contiguous to the U-SIG field, an STF (short training field) that is contiguous to the EHT-SIG field, an LTF (long training field) that is contiguous to the STF, and a data field that is contiguous to the LTF, wherein the U-SIG field includes a PHY version identifier having a length of 3 bits related to the PHY (physical) version of the PPDU, wherein the U-SIG field further includes a type field having a type value related to the duplicate transmission mode, wherein the PPDU is an 80 MHz PPDU, wherein the U-SIG field is replicated on each 20 MHz subchannel within the 80 MHz PPDU, wherein the EHT-SIG field includes a content channel that is replicated on each 20 MHz subchannel within the 80 MHz PPDU, wherein the data field includes a first 484-tone RU (resource unit) and a second 484-tone RU, wherein the first 484-tone RU is replicated to the second 484-tone RU, wherein the STF is configured based on an STF sequence already set for 80 MHz, wherein the LTF is configured based on an LTF sequence already set for 80 MHz, a receiving STA adapted to decode the PPDU based on the U-SIG field. **Claim 12** wherein the PPDU is an EHT (extremely high throughput) PPDU, wherein the type field has a length of 2 bits, wherein the type field has a first value related to the duplicate transmission mode, a second value related to DL (downlink) OFDMA (orthogonal frequency division multiple access) transmission, and a third value related to non-OFDMA DL MU-MIMO (multi-user multiple input multiple output) transmission, the receiving STA according to claim 11.

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