Configuration of data unit for duplicate 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] TECHNICAL FIELD This specification relates to wireless LAN systems, and more particularly to the construction of data units for duplicate transmission. [Background technology]

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

[0003] This specification proposes technical features that can be utilized in a new communication standard. For example, the new communication standard may be the Extreme High Throughput (EHT) standard that has been recently under discussion. The EHT standard may use newly proposed increased bandwidth, improved PHY layer protocol data unit (PPDU) structure, improved sequences, Hybrid automatic repeat request (HARQ) techniques, etc. The EHT standard may be referred to as the IEEE 802.11be standard.

[0004] The EHT standard allows for wide bandwidth (eg, 160 / 320 MHz), 16 streams, and / or multi-link (or multi-band) operation to be used to support high throughput and high data rates.

[0005] In the EHT standard, wide bandwidth (e.g., 160 / 240 / 320 MHz) can be used for high throughput, and preamble puncturing and multiple RU transmission can be used to efficiently use the bandwidth. Summary of the Invention [Problem to be solved by the invention]

[0006] Various technical features are being discussed in the new WLAN standard to extend signal transmission. This specification proposes various technical features to extend the transmission range of WLAN signals. [Means for solving the problem]

[0007] The technical features of this specification relate to technical features performed by a Station (STA) of a wireless Local Area Network (WLAN). The STA based on this specification configures a transmission physical protocol data unit (PPDU) based on a duplicate transmission mode.

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

[0009] For example, the first control signal field includes a type field that includes a type value associated with the duplicate transmission mode.

[0010] For example, the data field may include a first data RU including a tone for half the total bandwidth of the transmitted 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 a predefined STF sequence for the total bandwidth.

[0012] For example, the LTFs are configured based on a pre-defined LTF sequence for the total bandwidth. Effect of the Invention

[0013] The technical features of 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., the 6 GHz band), the technical features of this specification can be applied to signals transmitted in the band. This allows stable transmission and reception of signals even in bands where the transmission power is limited. [Brief description of the drawings]

[0014] [Figure 1] 1 illustrates an example of a transmitting device and / or a receiving device according to the present specification. [Diagram 2] 1 is a conceptual diagram showing the structure of a wireless LAN (WLAN). [Diagram 3] An example of a PPDU used in the IEEE standard is shown below. [Figure 4] The arrangement of resource units (RUs) used on the 20 MHz band is shown. [Diagram 5] The arrangement of resource units (RUs) used on the 40 MHz band is shown. [Figure 6] The arrangement of resource units (RUs) used on the 80 MHz band is shown. [Figure 7] The structure of the HE-SIG-B field is shown below. [Figure 8]An example is shown in which multiple user STAs are assigned to the same RU via the MU-MIMO technique. [Figure 9] Shows operation with UL-MU. [Figure 10] An example of channels used / supported / defined within the 2.4 GHz band is shown below. [Figure 11] An example of channels used / supported / defined within the 5 GHz band is shown below. [Figure 12] An example of channels used / supported / defined within the 6 GHz band is shown below. [Figure 13] 1 shows an example of a PPDU used in this specification. [Figure 14] 1 shows a modified example of the transmitting device and / or the receiving device of the present specification. [Figure 15] An example of a combination of RU26 and RU52 at 20MHz is shown below. [Figure 16] An example of a combination of RU26 and RU52 at 40MHz is shown below. [Figure 17] An example of a combination of RU26 and RU52 at 80MHz is shown below. [Figure 18] An example of EHT PPDU is shown below. [Figure 19] 1 illustrates an example of a first control signal field or U-SIG field herein. [Figure 20] This is an example where the symbols for the first control signal field are repeated. [Figure 21] This is another example in which symbols for the first control signal field are repeated. [Figure 22] An example of a repeated second control signal field is shown below. [Figure 23] 1 shows an example in which the first and second control signal fields are repeated. [Figure 24] 1 shows an example where data fields are repeated for wide bandwidth transmission. [Diagram 25] 1 is an example of an ER PPDU including STF / LTF fields set based on the total bandwidth. [Figure 26] 1 shows an example of a PPDU in which duplication / repetition is performed only on specific units. [Figure 27] 1 shows an example of configuring a PPDU based on a specific frequency band / channel. [Figure 28] 4 is a procedural flow diagram illustrating operations performed at a transmitting STA. [Figure 29] 11 is a procedural flow diagram illustrating operations performed at a receiving STA. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] As used herein, "A or B" can mean "A only," "B only," or "both A and B." In other words, as used herein, "A or B" can be interpreted as "A and / or B." For example, as used herein, "A, B or C" can mean "A only," "B only," "C only," or "any combination of A, B and C."

[0016] As used herein, a slash ( / ) or a comma can mean "and / or." For example, "A / B" can mean "A and / or B." Thus, "A / B" can mean "A only," "B only," 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 "A only," "B only," or "both A and B." In addition, in this specification, the expressions "at least one of A or B" and "at least one of A and / or B" can be interpreted similarly to "at least one of A and B."

[0018] In addition, in this specification, "at least one of A, B and C" can mean "A only," "B only," "C only," or "any combination of A, B and C." Furthermore, "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] Furthermore, parentheses used in this specification may mean "for example." Specifically, when "control information (EHT-Signal)" is displayed, "EHT-Signal" may be proposed as an example of "control information." In other words, "control information" in this specification is not limited to "EHT-Signal," and "EHT-Signal" may be proposed as an example of "control information." Furthermore, when "control information (i.e., EHT-signal)" is displayed, "EHT-signal" may be proposed as an example of "control information."

[0020] Technical features described individually in one drawing in this specification can be realized individually or simultaneously.

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

[0022] In order to explain the technical features of the present specification, technical features to which the present specification can be applied will be explained below.

[0023] FIG. 1 shows an example of a transmitting device and / or a receiving device according to the present specification.

[0024] The example of FIG. 1 can perform various technical features described below. FIG. 1 is related to at least one STA (station). For example, the STA (110, 120) in this specification can be called various names such as a mobile terminal, a wireless device, a wireless transmit / receive unit (WTRU), a user equipment (UE), a mobile station (MS), a mobile subscriber unit, or simply a user. The STA (110, 120) in this specification can be called various names such as a network, a base station, a Node-B, an access point (AP), a repeater, a router, a relay, etc. The STA (110, 120) in this specification can be called 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 STAs (110, 120) can act as an Access Point (AP) or a non-AP. That is, the STAs (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 referred to as an AP STA.

[0026] The STAs (110, 120) of the present specification may support various communication standards other than the IEEE 802.11 standard. For example, communication standards according to the 3GPP standard (e.g., LTE, LTE-A, 5G NR standard) may be supported. The STAs of the present specification may be realized in various devices such as a mobile phone, a vehicle, a personal computer, etc. The STAs of the present specification may support communication for various communication services such as voice communication, video communication, data communication, self-driving, autonomous driving, etc.

[0027] As used herein, the STAs (110, 120) may include a medium access control (MAC) and physical layer interface to the wireless medium in accordance with the provisions of the IEEE 802.11 standard.

[0028] The STAs (110, 120) will be described below based on the sub-diagram (a) of FIG.

[0029] The first STA (110) may include a processor 111, a memory 112, and a transceiver 113. The illustrated processor, memory, and transceiver may each be implemented on a separate chip, or at least two or more blocks / functions may be implemented 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 operation of the AP. For example, the processor 111 of the AP can receive signals via the transceiver 113, process the received signals, generate transmission signals, and perform control for signal transmission. The memory 112 of the AP can store signals received via the transceiver 113 (i.e., received signals) and can store signals transmitted via the transceiver (i.e., transmitted signals).

[0032] For example, the second STA (120) can perform the intended operation of a non-AP STA. For example, the non-AP transceiver 123 can transmit and receive signals. Specifically, it can transmit and receive IEEE 802.11 packets (e.g., IEEE 802.11a / b / g / n / ac / ax / be, etc.).

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

[0034] For example, in the following specification, the operation of the device indicated by the AP may be performed by the first STA (110) or the second STA (120). For example, when the first STA (110) is an AP, the operation of the device indicated by the AP may be controlled by the processor 111 of the first STA (110), and related signals may be transmitted or received via the transceiver 113 controlled by the processor 111 of the first STA (110). Also, control information related to the operation of the AP and the transmission / reception signals of the AP may be stored in the memory 112 of the first STA (110). Also, when the second STA (110) is an AP, the operation of the device indicated by the AP may be controlled by the processor 121 of the second STA (120), and related signals may be transmitted or received via the transceiver 123 controlled by the processor 121 of the second STA (120). In addition, control information related to the operation of the AP and the AP's transmission / reception signals can be stored in the memory 122 of the second STA (110).

[0035] For example, the operation of the device indicated as non-AP (or User-STA) in the following specification may be performed by the first STA (110) or the second STA (120). For example, if the second STA (120) is a non-AP, the operation of the device indicated as non-AP may be controlled by the processor 121 of the second STA (120), and related signals may be transmitted or received via the transceiver 123 controlled by the processor 121 of the second STA (120). In addition, control information related to the operation of the non-AP and transmission / reception signals of the AP may be stored in the memory 122 of the second STA (120). For example, if the first STA (110) is a non-AP, the operation of the device indicated as non-AP may be controlled by the processor 111 of the first STA (110), and related signals may be transmitted or received via the transceiver 113 controlled by the processor 111 of the first STA (120). In addition, control information related to the operation of the non-AP and the AP's transmission / reception signals can be stored in the memory 112 of the first STA (110).

[0036] In the following specification, devices referred to as (transmitting / receiving) STA, first STA, second STA, STA1, STA2, AP, first AP, second AP, AP1, AP2, (transmitting / receiving) terminal, (transmitting / receiving) device, (transmitting / receiving) apparatus, network, etc. may refer to the STAs (110, 120) in FIG. 1. For example, devices indicated as (transmitting / receiving) STA, first STA, second STA, STA1, STA2, AP, first AP, second AP, AP1, AP2, (transmitting / receiving) terminal, (transmitting / receiving) device, (transmitting / receiving) apparatus, network, etc. without specific reference numerals may also refer to the STAs (110, 120) in FIG. 1. For example, in the following example, the operation of various STAs transmitting and receiving signals (e.g., PPPDU) may be performed by the transceivers 113, 123 in FIG. 1. In addition, in the following example, various STAs may generate transmission / reception signals or perform data processing or calculations in advance for transmission / reception signals in the processors 111 and 121 in Fig. 1. For example, an example of an operation of generating transmission / reception signals or performing data processing or calculations in advance for transmission / reception signals may include: 1) an operation of determining / obtaining / configuring / calculating / decoding / encoding bit information of subfields (SIG, STF, LTF, Data) included in a PPDU; 2) an operation of determining / configuring / obtaining time resources and frequency resources (e.g., subcarrier resources) used for the subfields (SIG, STF, LTF, Data) included in a PPDU; 3) an operation of determining / configuring / obtaining specific sequences (e.g., pilot sequences, STF / LTF sequences, extra sequences applied to SIGs) used for the subfields (SIG, STF, LTF, Data) included in a PPDU; 4) an operation of power control and / or power saving applied to the STA; and 5) an operation related to determining / obtaining / configuring / calculating / decoding / encoding an ACK signal.In addition, various information (e.g., information related to fields / subfields / control fields / parameters / power, etc.) used by various STAs in the following example to determine / acquire / configure / calculate / decode / encode transmitted / received signals may be stored in memories 112, 122 of FIG. 1.

[0037] The above-mentioned device / STA of sub-figure (a) of Fig. 1 can be modified as shown in sub-figure (b) of Fig. 1. Hereinafter, the STA (110, 120) of this specification will be described based on sub-figure (b) of Fig. 1.

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

[0039] In the following description, a mobile terminal, a wireless device, a wireless transmit / receive unit (WTRU), a user equipment (UE), a mobile station (MS), a mobile subscriber unit, a user, a user STA, a network, a base station, a Node-B, an access point (AP), a repeater, a router, a relay, a receiving device, a transmitting device, a receiving STA, a transmitting STA, a receiving device, a transmitting device, a receiving apparatus, and / or a transmitting apparatus may refer to the STA (110, 120) shown in the sub-drawing (a) / (b) of Fig. 1, or may refer to the processing chips 114, 124 shown in the sub-drawing (b) of Fig. 1. That is, the technical features of the present specification may be performed by the STA (110, 120) shown in the sub-drawing (a) / (b) of Fig. 1, or may be performed only by the processing chips 114, 124 shown in the sub-drawing (b) of Fig. 1. For example, the technical feature of the transmitting STA transmitting a control signal can be understood as a technical feature in which a control signal generated by the processor 111, 121 shown in sub-drawing (a) / (b) of Fig. 1 is transmitted via the transceiver 113, 123 shown in sub-drawing (a) / (b) of Fig. 1. Alternatively, the technical feature of the transmitting STA transmitting a control signal can be understood as a technical feature in which a control signal transmitted to the transceiver 113, 123 is generated by the processing chip 114, 124 shown in sub-drawing (b) of Fig. 1.

[0040] For example, the technical feature of the receiving STA receiving the control signal can be understood as the technical feature of the control signal being received by the transceivers 113 and 123 shown in sub-drawing (a) of Fig. 1. Or, the technical feature of the receiving STA receiving the control signal can be understood as the technical feature of the control signal received by the transceivers 113 and 123 shown in sub-drawing (a) of Fig. 1 being acquired by the processors 111 and 121 shown in sub-drawing (a) of Fig. 1. Or, the technical feature of the receiving STA receiving the control signal can be understood as the technical feature of the control signal received by the transceivers 113 and 123 shown in sub-drawing (b) of Fig. 1 being acquired by the processing chips 114 and 124 shown in sub-drawing (b) of Fig. 1.

[0041] 1, software code 115, 125 may be provided within memory 112, 122. The software code 115, 125 may include instructions that control the operation of the processor 111, 121. The software code 115, 125 may be included in a variety of programming languages.

[0042] The processor 111, 121 or the processing chip 114, 124 shown in FIG. 1 may include an application-specific integrated circuit (ASIC), other chipsets, logic circuits, and / or data processing devices. The processor may be an application processor (AP). For example, the processor 111, 121 or the processing chip 114, 124 shown in FIG. 1 may include at least one of a digital signal processor (DSP), a central processing unit (CPU), a graphics processing unit (GPU), and a modem (modulator and demodulator). For example, the processors 111, 121 or processing chips 114, 124 shown in FIG. 1 may be a SNAPDRAGON™ series processor manufactured by Qualcomm®, an EXYNOS™ series processor manufactured by Samsung®, an A series processor manufactured by Apple®, a HELIO™ series processor manufactured by MediaTek®, an ATOM™ series processor manufactured by INTEL®, or an enhanced processor thereof.

[0043] In this specification, the uplink may refer to a link for communication from a non-AP STA to an AP STA, and uplink PPDUs / packets / signals, etc. may be transmitted via the uplink. Also, in this specification, the downlink may refer to a link for communication from an AP STA to a non-AP STA, and downlink PPDUs / packets / signals, etc. may be transmitted via the downlink.

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

[0045] The top part of Figure 2 shows the structure of an IEEE (Institute of electrical and electronic engineers) 802.11 infrastructure basic service set (BSS).

[0046] Referring to the top of FIG. 2, the wireless LAN system may include one or more infrastructure BSSs (200, 205) (hereinafter, BSS). The BSSs (200, 205) are a collection of APs and STAs, such as an access point (AP, 225) and a station (STA1, 200-1), that can successfully synchronize and communicate with each other, and are not a concept that refers to a specific area. The BSS (205) may also include one or more STAs (205-1, 205-2) that can be associated with one AP (230).

[0047] The BSS may include at least one STA, APs (225, 230) that provide a distribution service, and a distribution system (DS, 210) that connects a plurality of APs.

[0048] The distributed system 210 can realize an extended service set (ESS, 240) by connecting several BSSs (200, 205). The ESS (240) can be used as a term indicating a network formed by connecting one or more APs via the distributed system 210. The APs included in one ESS (240) can have the same service set identification (SSID).

[0049] The portal (220) can act as a bridge between a wireless LAN network (IEEE 802.11) and other networks (eg, 802.X).

[0050] In the BSS shown at the top 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 be possible to set up a network between STAs without APs (225, 230) and communicate with each other. A network in which a network is set up between STAs without APs (225, 230) and communicates with each other is defined as an Ad-Hoc network or an independent basic service set (IBSS).

[0051] The bottom part of FIG. 2 is a conceptual diagram showing the IBSS.

[0052] Referring to the bottom of FIG. 2, an IBSS is a BSS that operates in an ad-hoc mode. Since an IBSS does not include an AP, there is no centralized management entity that performs management functions. 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) may be mobile STAs, and connection to a distributed system is not permitted, forming a self-contained network.

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

[0054] As shown in the figure, various types of PPDUs (PHY protocol data units) are used in standards such as IEEE a / g / n / ac. Specifically, the LTF and STF fields contain training signals, SIG-A and SIG-B contain control information for receiving stations, and the data field contains user data corresponding to the PSDU (MAC PDU / Aggregated MAC PDU).

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

[0056] As shown in the figure, an HE-PPDU for a multiple user (MU) may include a legacy-short training field (L-STF), a legacy-long training field (L-LTF), a legacy-signal (L-SIG), a high efficiency-signal A (HE-SIG-A), a high efficiency-signal-B (HE-SIG-B), a high efficiency-short training field (HE-STF), a high efficiency-long training field (HE-LTF), a data field (or MAC payload), and a Packet Extension (PE) field. Each field may be transmitted during the time interval shown (i.e., 4 or 8 μs, etc.).

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

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

[0059] As shown in Figure 4, resource units (RUs) corresponding to different numbers of tones (i.e., subcarriers) may be used to configure some fields of the HE-PPDU. For example, resources may be allocated to the HE-STF, HE-LTF, and data fields in the illustrated RU units.

[0060] As shown at the top 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 can be used as a guard band, and in the rightmost band of the 20 MHz band, 5 tones can be used as a guard band. In addition, 7 DC tones are inserted into the center band, i.e., the DC band, and 26-units corresponding to 13 tones can exist on each side of the DC band. In addition, 26-units, 52-units, and 106-units can be allocated to other bands. Each unit can be allocated for a receiving station, i.e., a user.

[0061] On the other hand, the RU arrangement of Figure 4 can be utilized not only in a multiple user (MU) situation but also in a single user (SU) situation, in which case, as shown at the bottom of Figure 4, one 242-unit can be used, and in this case, three DC tones can be inserted.

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

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

[0064] Just as various sizes of RUs are used in the example of Figure 4, 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, etc. can be used in the example of Figure 5. In addition, 5 DC tones can be inserted into the center frequency, 12 tones can be used as a guard band in the leftmost band of the 40 MHz band, and 11 tones can be used as a guard band in the rightmost band of the 40 MHz band.

[0065] Also, as shown in the figure, when used for a single user, 484-RU can be used, while the specific number of RUs can be changed, as in the example of FIG.

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

[0067] As various sizes of RUs are used in the examples of Figures 4 and 5, 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, 996-RU, etc. can be used in the example of Figure 6. Seven DC tones can be inserted into the center frequency, 12 tones can be used as a guard band in the leftmost band of the 80 MHz band, and 11 tones can be used as a guard band in the rightmost band of the 80 MHz band. Also, 26-RU using 13 tones on each side of the DC band can be used.

[0068] Also, as shown, when used for a single user, 996-RU can be used, in which case five 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 performed, a transmitting STA (e.g., AP) can assign a first RU (e.g., 26 / 52 / 106 / 242-RU, etc.) to a first STA and a second RU (e.g., 26 / 52 / 106 / 242-RU, etc.) to a second STA through the Trigger frame. Thereafter, 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 and second Trigger-based PPDUs are transmitted to the AP in the same time period.

[0070] For example, when a DL MU PPDU is configured, a transmitting STA (e.g., an AP) can assign a first RU (e.g., 26 / 52 / 106 / 242-RU, etc.) to a first STA and a second RU (e.g., 26 / 52 / 106 / 242-RU, etc.) to a second STA. That is, the transmitting STA (e.g., an 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 in one MU PPDU.

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

[0072] FIG. 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 may include information that is commonly applied to all users (i.e., user STAs) that receive the SIG-B. The user-specific field 730 may be referred to as a user-specific control field. When the SIG-B is transmitted to multiple users, the user-specific field 730 may apply to only 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 bits of RU allocation information. For example, the RU allocation information can include information about 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 about which RUs (26-RU / 52-RU / 106-RU) are allocated to which frequency band.

[0076] An example of the RU allocation information consisting of 8 bits is as follows:

[0077] [Table 1]

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

[0079] The example in Table 1 shows only a portion of the RU locations that can be displayed in the RU allocation information.

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

[0081] [Table 2]

[0082] "01000y2y1y0" refers to an example in which a 106-RU is assigned to the leftmost side of a 20MHz channel, and five 26-RUs are assigned to the right of the 106-RU. In this case, multiple STAs (e.g., User-STAs) can be assigned to the 106-RU based on the MU-MIMO technique. Specifically, up to eight STAs (e.g., User-STAs) can be assigned to the 106-RU, and the number of STAs (e.g., User-STAs) assigned to the 106-RU is determined based on the 3-bit information (y2y1y0). For example, when the 3-bit information (y2y1y0) is set to N, the number of STAs (e.g., User-STAs) assigned to the 106-RU based on the MU-MIMO technique is N+1.

[0083] Generally, multiple STAs (e.g., User STAs) that are different from each other can be assigned to multiple RUs. However, multiple STAs (e.g., User STAs) can be assigned to one RU that is equal to or larger than a certain size (e.g., 106 subcarriers) based on the MU-MIMO technique.

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

[0085] For example, when RU allocation is set to "01000y2y1y0", multiple user STAs can be allocated to the 106-RU located on the left side through the MU-MIMO technique, and five user STAs can be allocated to the five 26-RUs located to the right side through the non-MU-MIMO technique. This case is embodied by the example of FIG. 8.

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

[0087] For example, when RU allocation is set to "01000010" as shown in FIG. 7, a 106-RU may be allocated to the leftmost side of a specific channel, and five 26-RUs may be allocated to the right of it, based on Table 2. Also, a total of three user STAs may 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-specific field 730 of HE-SIG-B may include eight user fields.

[0088] The eight user fields may be included in the order shown in Figure 8. Also, as shown in Figure 7, two user fields may be implemented in one user block field.

[0089] The user fields shown in Figures 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 a first format, and the user field related to the non-MU-MIMO technique can be configured in a second format. With reference to the example of Figure 8, User Fields 1 to 3 can be based on the first format, and User Fields 4 to 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 may have the same size (eg, 21 bits). For example, the user field of the first format (the format of the MU-MIMO technique) may be configured as follows:

[0091] For example, the first bits (e.g., B0-B10) in the User field (i.e., 21 bits) may include identification information (e.g., STA-ID, partial AID, etc.) of a User STA to which the corresponding User field is assigned. Also, the second bits (e.g., B11-B14) in the User field (i.e., 21 bits) may include information regarding spatial configuration. Specifically, an example of the second bits (i.e., B11-B14) is 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) may include information regarding the number of spatial streams allocated to a plurality of user STAs allocated by the MU-MIMO technique. For example, as shown in FIG. 8, when three user STAs are allocated to 106-RU based on the MU-MIMO technique, N_user is set to '3', and the values ​​of N_STS[1], N_STS[2], and N_STS[3] may be determined as shown in Table 3. 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 may be set. That is, in the example of FIG. 8, four spatial streams may be allocated to user field 1, one spatial stream may be allocated to user field 2, and one spatial stream may be allocated to user field 3.

[0095] As an example of Table 3 and / or Table 4, information on the number of spatial streams for a user station (user STA) (i.e., second bits, B11-B14) may be configured with 4 bits. Also, the information on the number of spatial streams for a user station (user STA) (i.e., second bits, B11-B14) may support up to 8 spatial streams. Also, the information on the number of spatial streams (i.e., second bits, B11-B14) may support up to 4 spatial streams for one user STA.

[0096] In addition, the third bit (i.e., B15-18) in the User field (i.e., 21 bits) may include MCS (Modulation and coding scheme) information. The MCS information may be applied to a data field in a PPDU that includes the corresponding SIG-B.

[0097] As used herein, MCS, MCS information, MCS index, MCS field, etc. may be represented by a specific index value. For example, MCS information may be represented by index 0 to index 11. MCS information may include information on characteristic modulation type (e.g., BPSK, QPSK, 16-QAM, 64-QAM, 256-QAM, 1024-QAM, etc.) and information on coding rate (e.g., 1 / 2, 2 / 3, 3 / 4, 5 / 6, etc.). Information on channel coding type (e.g., BCC or LDPC) may be excluded from MCS information.

[0098] Also, the fourth bit (ie, B19) in the User field (ie, 21 bits) is a Reserved field.

[0099] In addition, the fifth bit (i.e., B20) in the User field (i.e., 21 bits) may include information on the coding type (e.g., BCC or LDPC). That is, the fifth bit (i.e., B20) may include information on the type of channel coding (e.g., BCC or LDPC) applied to the data field in the PPDU including the corresponding SIG-B.

[0100] The above example relates to the user field of the first format (format of the MU-MIMO technique). An example of the user field of the second format (format of the non-MU-MIMO technique) is as follows:

[0101] The first bit (e.g., B0-B10) in the User field of the second format may include identification information of the User STA. The second bit (e.g., B11-B13) in the User field of the second format may include information regarding the number of spatial streams applied to the corresponding RU. The third bit (e.g., B14) in the User field of the second format may include information regarding whether a beamforming steering matrix is ​​applied. The fourth bit (e.g., B15-B18) in the User field of the second format may include MCS (Modulation and coding scheme) information. The fifth bit (e.g., B19) in the User field of the second format may include information regarding whether DCM (Dual Carrier Modulation) is applied. The sixth bit (i.e., B20) in the User field of the second format may include information regarding a coding type (e.g., BCC or LDPC).

[0102] 9 shows the operation of the UL-MU. As shown in the figure, a transmitting STA (e.g., AP) can perform channel connection through contention (i.e., Backoff operation) and transmit a Trigger frame 930. That is, the transmitting STA (e.g., AP) can transmit a PPDU including a Trigger frame 930. When a PPDU including a Trigger frame is received, a TB (trigger-based) PPDU is transmitted after a delay of about SIFS.

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

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

[0105] The 2.4 GHz band may be referred to by other names, such as the first band, or the like, and may refer to a frequency range in which channels with center frequencies adjacent to 2.4 GHz (e.g., channels with center frequencies located within 2.4 to 2.5 GHz) are used / supported / defined.

[0106] The 2.4 GHz band may include multiple 20 MHz channels. The 20 MHz in the 2.4 GHz band may have multiple channel indexes (e.g., index 1 to index 14). For example, the center frequency of a 20 MHz channel assigned with channel index 1 is 2.412 GHz, the center frequency of a 20 MHz channel assigned with channel index 2 is 2.417 GHz, and the center frequency of a 20 MHz channel assigned with channel index N is (2.407+0.005*N) GHz. The channel index may be called by various names such as a channel number. The specific values ​​of the channel index and the center frequency may be changed.

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

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

[0109] The 5 GHz band may be referred to by other names such as a second band / band. The 5 GHz band may refer to a frequency range in which channels with center frequencies of 5 GHz or more and less than 6 GHz (or less than 5.9 GHz) are used / supported / defined. Alternatively, the 5 GHz band may include multiple channels between 4.5 GHz and 5.5 GHz. The specific values ​​shown in FIG. 11 may be changed.

[0110] The channels in the 5 GHz band include the Unlicensed National Information Infrastructure (UNII)-1, UNII-2, UNII-3, and ISM. UNII-1 can be referred to as UNII Low. UNII-2 can include frequency regions called UNII Mid and UNII-2Extended. UNII-3 can be referred to as UNII-Upper.

[0111] A plurality of channels may be set within the 5 GHz band, and the bandwidth of each channel may be variously set to 20 MHz, 40 MHz, 80 MHz, or 160 MHz. For example, the 5170 MHz to 5330 MHz frequency region / range within UNII-1 and UNII-2 may be divided into eight 20 MHz channels. The 5170 MHz to 5330 MHz frequency region / range may be divided into four channels via a 40 MHz frequency region. The 5170 MHz to 5330 MHz frequency region / range may be divided into two channels via an 80 MHz frequency region. Or, the 5170 MHz to 5330 MHz frequency region / range may be divided into one channel via a 160 MHz frequency region.

[0112] FIG. 12 shows an example of channels used / supported / defined within the 6 GHz band.

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

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

[0115] As a result, 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, and 233. Also, by the (5.940+0.005*N) GHz rule mentioned above, the indices for 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, and 227.

[0116] In the example of FIG. 12, 20, 40, 80, and 160 MHz channels are shown, but additional 240 MHz and 320 MHz channels can be added.

[0117] The PPDU transmitted / received by the STA in this specification is described below.

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

[0119] 13 may be referred to by various names such as EHT PPDU, transmit PPDU, receive PPDU, first type or Nth type PPDU, etc. For example, in this specification, PPDU or EHT PPDU may be referred to by various names such as transmit PPDU, receive PPDU, first type or Nth type PPDU, etc. Also, the EHT PPU may be used in an EHT system and / or a new WLAN system that improves the EHT system.

[0120] The PPDU in FIG. 13 may indicate some or all of the PPDU types used in the EHT system. For example, the example in FIG. 13 may be used for both the single-user (SU) mode and the multi-user (MU) mode. In other words, the PPDU in FIG. 13 is a PPDU for one receiving STA or multiple receiving STAs. When the PPDU in FIG. 13 is used for the Trigger-based (TB) mode, the EHT-SIG in FIG. 13 may be omitted. In other words, a STA that receives a Trigger frame for Uplink-MU (UL-MU) communication may transmit a PPDU in the example in FIG. 13 with the EHT-SIG omitted.

[0121] In FIG. 13, the L-STF to EHT-LTF may be referred to as a preamble or a physical preamble, and may be generated / transmitted / received / acquired / decoded in 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 may be determined to be 312.5 kHz, and the subcarrier spacing of the EHT-STF, EHT-LTF, and Data fields may 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 may be represented in units of 312.5 kHz, and the tone index (or subcarrier index) of the EHT-STF, EHT-LTF, and Data fields may be represented in units of 78.125 kHz.

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

[0124] The L-SIG field in FIG. 13 may include, for example, 24-bit bit information. For example, the 24-bit information may include a 4-bit Rate field, a 1-bit Reserved bit, a 12-bit Length field, a 1-bit Parity bit, and 6-bit Tail bits. For example, the 12-bit Length field may include information regarding the length or time duration of the PPDU. For example, the value of the 12-bit Length field may be determined based on the type of the PPDU. For example, if the PPDU is a non-HT, HT, VHT PPDU, or an EHT PPDU, the value of the Length field may be determined to be a multiple of 3. For example, if the PPDU is a HE PPDU, the value of the Length field may be determined to be a "multiple of 3+1" or a "multiple of 3+2". In other words, for a non-HT, HT, VHT PPDU, or EHT PPDU, the value of the Length field may be determined to be a multiple of 3, and for a HE PPDU, the value of the Length field may be determined to be "a multiple of 3 + 1" or "a multiple of 3 + 2".

[0125] For example, the transmitting STA may apply BCC encoding based on a code rate of 1 / 2 to the 24-bit information of the L-SIG field. Then, the transmitting STA may obtain 48 BCC coded bits. BPSK modulation may be applied to the 48 coded bits to generate 48 BPSK symbols. The transmitting STA may map the 48 BPSK symbols to positions excluding the pilot subcarrier {subcarrier index -21, -7, +7, +21} and the DC subcarrier {subcarrier index 0}. As a result, the 48 BPSK symbols may be mapped to subcarrier indexes -26 to -22, -20 to -8, -6 to -1, +1 to +6, +8 to +20, and +22 to +26. The transmitting STA may additionally map signals of {-1, -1, -1, 1} to subcarrier indexes {-28, -27, +27, +28}. The above signal can be used for channel estimation for the frequency domain corresponding to {-28, -27, +27, +28}.

[0126] The transmitting STA can generate a RL-SIG, which is generated the same 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] A Universal SIG (U-SIG) can be inserted after the RL-SIG in Figure 13. The U-SIG can be called various names such as a first SIG field, a first SIG, a first type SIG, a control signal, a control signal field, a first (type) control signal, etc.

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

[0129] For example, A-bit information (e.g., 52 un-coded bits) can be transmitted via the U-SIG (or U-SIG field), where the first symbol of the U-SIG transmits the first X-bit information (e.g., 26 un-coded bits) of the total A-bit information, and the second symbol of the U-SIG transmits the remaining Y-bit information (e.g., 26 un-coded bits) of 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 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 (subcarriers) from subcarrier index -28 to subcarrier index +28, excluding DC index 0. The 52 BPSK symbols generated by the transmitting STA can be transmitted based on the remaining tones (subcarriers) excluding the pilot tones -21, -7, +7, and +21.

[0130] For example, the A-bit information (e.g., 52 un-coded bits) transmitted by the U-SIG may include a CRC field (e.g., a 4-bit long field) and a tail field (e.g., a 6-bit long field). The CRC field and the tail field may be transmitted via the second symbol of the U-SIG. The CRC field may be generated based on 26 bits assigned to the first symbol of the U-SIG and the remaining 16 bits in the second symbol excluding the CRC / tail field, and may be generated based on a conventional CRC calculation algorithm. In addition, the tail field may be used to terminate the trellis of a convolutional decoder, and may be set to, for example, "000000".

[0131] A-bit information (e.g., 52 uncoded bits) transmitted by the U-SIG (or U-SIG field) can be divided into version-independent bits and version-dependent bits. For example, the size of the version-independent bits can be fixed or variable. For example, the version-independent bits can be assigned only to the first symbol of the U-SIG, or the version-independent bits can be assigned to both the first and second symbols of the U-SIG. For example, the version-independent bits and the version-dependent bits can be referred to by various names such as first control bits and second control bits.

[0132] For example, the version-independent bits of the U-SIG may include a 3-bit PHY version identifier. For example, the 3-bit PHY version identifier may include information related to the PHY version of the transmitted / received PPDU. For example, a first value of the 3-bit PHY version identifier may indicate that the transmitted / received PPDU is an EHT PPDU. In other words, when transmitting an EHT PPDU, the transmitting STA may set the 3-bit PHY version identifier to a first value. In other words, the receiving STA may determine that the received PPDU is an EHT PPDU based on the PHY version identifier having the first value.

[0133] For example, the version-independent bits of the U-SIG may include a one-bit UL / DL flag field, where a first value of the one-bit UL / DL flag field is associated with UL communication and a second value of the UL / DL flag field is associated with DL communication.

[0134] For example, the version-independent bits of the U-SIG may include information regarding the length of the TXOP and information regarding the BSS color ID.

[0135] For example, when EHT PPDU is divided into various types (e.g., EHT PPDU associated with SU mode, EHT PPDU associated with MU mode, EHT PPDU associated with TB mode, EHT PPDU associated with Extended Range transmission, etc.), information regarding the type of EHT PPDU can be included in the version-dependent bits of the U-SIG.

[0136] For example, the U-SIG may include information regarding 1) a bandwidth field including information regarding the bandwidth, 2) a field including information regarding the MCS technique applied to the EHT-SIG, 3) an indication field including information related to whether a dual subcarrier modulation (DCM) technique is applied to the EHT-SIG, 4) a field including information regarding the number of symbols used for the EHT-SIG, 5) a field including information regarding whether the EHT-SIG is generated across the entire band, 6) a field including information regarding the type of EHT-LTF / STF, and 7) 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 portion of the entire band of the PPDU (e.g., the secondary 20 MHz band). For example, when an 80 MHz PPDU is transmitted, the STA applies puncturing to the secondary 20 MHz band of the 80 MHz band, and can transmit the PPDU only through the primary 20 MHz band and the secondary 40 MHz band.

[0138] For example, the preamble puncturing pattern may be preset. For example, when a first puncturing pattern is applied, puncturing may be applied only to a secondary 20 MHz band in an 80 MHz band. For example, when a second puncturing pattern is applied, puncturing may be applied only to one of two secondary 20 MHz bands included in a secondary 40 MHz band in an 80 MHz band. For example, when a third puncturing pattern is applied, puncturing may be applied only to a secondary 20 MHz band included in a primary 80 MHz band in a 160 MHz band (or an 80+80 MHz band). For example, when a fourth puncturing pattern is applied, a primary 40 MHz band included in a primary 80 MHz band in a 160 MHz band (or an 80+80 MHz band) is present, and puncturing may 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 may be included in the U-SIG and / or the EHT-SIG, for example, a first field of the U-SIG may include information regarding the contiguous bandwidth of the PPDU, and a second field of the U-SIG may include information regarding preamble puncturing applied to the PPDU.

[0140] For example, the U-SIG and the EHT-SIG may include information on preamble puncturing based on the following method. If the bandwidth of the PPDU exceeds 80 MHz, the U-SIG may be individually configured in units of 80 MHz. For example, if the bandwidth of the PPDU is 160 MHz, the corresponding PPDU may include a first U-SIG for a first 80 MHz band and a second U-SIG for a second 80 MHz band. In this case, the first field of the first U-SIG may include information on the 160 MHz bandwidth, and the second field of the first U-SIG may include information on the preamble puncturing applied to the first 80 MHz band (i.e., information on the preamble puncturing pattern). Also, the first field of the second U-SIG may include information on the 160 MHz bandwidth, and the second field of the second U-SIG may include information on the preamble puncturing applied to the second 80 MHz band (i.e., information on the preamble puncturing pattern). On the other hand, the EHT-SIG subsequent to the first U-SIG may 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 subsequent to the second U-SIG may 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, the U-SIG and the EHT-SIG may include information about preamble puncturing based on the following method: The U-SIG may include information about preamble puncturing for all bands (i.e., information about preamble puncturing patterns). That is, the EHT-SIG does not include information about preamble puncturing, and only the U-SIG may include information about preamble puncturing (i.e., information about preamble puncturing patterns).

[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 duplicated. That is, the same four U-SIGs can be included in the 80 MHz PPDU. PPDUs that exceed the 80 MHz bandwidth can contain different U-SIGs.

[0143] The EHT-SIG in FIG. 13 may include control information for the receiving STA. The EHT-SIG may be transmitted via at least one symbol, and one symbol may have a length of 4us. Information regarding the number of symbols used for the EHT-SIG may be included in the U-SIG.

[0144] The EHT-SIG may include the technical features of the HE-SIG-B described in Figures 7 to 8. For example, the EHT-SIG may include a common field and a user-specific field, as in the example of Figure 7. The common field of the EHT-SIG may be omitted, and the number of user-specific fields may be determined based on the number of users.

[0145] As in the example of FIG. 7, the common field of the EHT-SIG and the user-specific field of the EHT-SIG can be coded separately. One user block field included in the user-specific field can include information for two users, while the last user block field included in the user-specific field can include information for one user. That is, one user block field of the EHT-SIG can include up to two user fields. As in the example of FIG. 8, each user field can be associated with a MU-MIMO allocation or a non-MU-MIMO allocation.

[0146] Similar to the example of FIG. 7, the common field of the EHT-SIG may include CRC bits and Tail bits, where the length of the CRC bits may be determined to be 4 bits, and the length of the Tail bits may be determined to be 6 bits and set to “000000”.

[0147] As in the example of FIG. 7, the common field of the EHT-SIG may include RU allocation information. The RU allocation information may refer to information regarding the location of RUs to which multiple users (i.e., multiple receiving STAs) are assigned. The RU allocation information may be configured in 8-bit (or N-bit) units as shown in Table 1.

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

[0149] [Table 5]

[0150] [Table 6]

[0151] [Table 7]

[0152] Examples of Tables 5 to 7 relate to information about the locations of RUs allocated to a 20 MHz band. For example, "Index 0" in Table 5 can be used in a situation where nine 26-RUs are individually allocated (e.g., a situation where nine 26-RUs are individually allocated as shown in FIG. 4).

[0153] On the other hand, in an EHT system, multiple RUs can be assigned to one STA. For example, in the case of "Index 60" in Table 6, one 26-RU is assigned to one user (i.e., the receiving STA) on the far left side of the 20 MHz band, one 26-RU and one 52-RU are assigned to another user (i.e., the receiving STA) on the right side, and five 26-RUs can be assigned individually to the right of that.

[0154] A mode in which the common field of the EHT-SIG is omitted may be supported. The mode in which the common field of the EHT-SIG is omitted may be called a compressed mode. When the compressed mode is used, multiple users of the EHT PPDU (i.e., multiple receiving STAs) can decode the PPDU (e.g., the data field of the PPDU) based on non-OFDMA. That is, multiple users of the EHT PPDU can decode the PPDU (e.g., the data field of the PPDU) received via the same frequency band. On the other hand, when the non-compressed mode is used, multiple users of the EHT PPDU can decode the PPDU (e.g., the data field of the PPDU) based on OFDMA. That is, multiple users of the EHT PPDU can receive the PPDU (e.g., the data field of the PPDU) via different frequency bands.

[0155] The EHT-SIG may be configured based on various MCS techniques. As described above, information related to the MCS technique applied to the EHT-SIG may be included in the U-SIG. The EHT-SIG may be configured based on the DCM technique. For example, among N data tones (e.g., 52 data tones) allocated for the EHT-SIG, a first modulation technique may be applied to consecutive half tones, and a second modulation technique may be applied to the remaining consecutive half tones. That is, the transmitting STA may modulate specific control information to a first symbol based on a first modulation technique and allocate it to the consecutive half tones, and modulate the same control information to a second symbol based on a second modulation technique and allocate it to the remaining consecutive half tones. As described above, information related to whether the DCM technique is applied to the EHT-SIG (e.g., a 1-bit field) may be included in the U-SIG.

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

[0157] The PPDU of FIG. 13 (ie, EHT-PPDU) can be constructed based on the examples of FIG. 4 and FIG.

[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 Figure 4. That is, the RU locations of the EHT-STF, EHT-LTF, and data fields included in the EHT PPDU can be determined as shown in Figure 4.

[0159] An EHT PPDU transmitted on a 40 MHz band, i.e., a 40 MHz EHT PPDU, can be configured based on the RU in Fig. 5. That is, the RU locations of the EHT-STF, EHT-LTF, and data fields included in the EHT PPDU can be determined as shown in Fig. 5.

[0160] Since the RU locations in Figure 5 correspond to 40 MHz, a tone-plan for 80 MHz can be determined by repeating the pattern in Figure 5 twice, i.e., the 80 MHz EHT PPDU can be transmitted based on a new tone-plan in which the RUs in Figure 5, which are not the RUs in Figure 6, are repeated twice.

[0161] When the pattern of Figure 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 an 80 MHz EHT PPDU allocated based on OFDMA can have 23 DC tones. In contrast, an 80 MHz EHT PPDU allocated based on non-OFDMA (i.e., non-OFDMA full bandwidth 80 MHz PPDU) can be configured based on 996RU 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 constructed by repeating the pattern of 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 EHT PPDU based on the following: For example, if 1) the first symbol after the L-LTF signal of the received PPDU is BPSK, 2) an RL-SIG in which the L-SIG of the received PPDU is repeated is detected, and 3) a 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 as EHT PPDU. If the received PPDU is determined as EHT PPDU, the receiving STA can detect the type of EHT PPDU (e.g., SU / MU / Trigger-based / Extended Range type) based on bit information included in the symbols after the RL-SIG in FIG. 13. In other words, the receiving STA can determine that the received PPDU is an EHT PPDU based on 1) the first symbol after the L-LTF signal, which is the BSPK, 2) an RL-SIG that is the same as the L-SIG immediately following the L-SIG field, 3) an L-SIG including a Length field in which the result of applying "modulo 3" is set to "0", and 4) the 3-bit PHY version identifier (e.g., a PHY version identifier having a first value) of the U-SIG mentioned above.

[0165] For example, the receiving STA can determine that the type of the received PPDU is HE PPDU based on the following: 1) the first symbol after the L-LTF signal is BPSK, 2) an RL-SIG in which the L-SIG is repeated is detected, and 3) the result of applying "modulo 3" to the Length value of the L-SIG is detected as "1" or "2", the received PPDU can be determined as HE PPDU.

[0166] For example, the receiving STA can determine the type of the received PPDU as non-HT, HT, or VHT PPDU based on the following: For example, if 1) the first symbol after the L-LTF signal is BPSK, and 2) an RL-SIG in which the L-SIG is repeated is not detected, the received PPDU can be determined as non-HT, HT, or VHT PPDU. Also, even if the receiving STA detects a 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, or VHT PPDU.

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

[0168] FIG. 14 shows a modified example of the transmitting device and / or the receiving device of this specification.

[0169] Each device / STA in 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 and 123 in Fig. 1. The transceiver 630 in Fig. 19 can include a receiver and a transmitter.

[0170] The processor 610 in Figure 14 is the same as the processors 111 and 121 in Figure 1. Alternatively, the processor 610 in Figure 14 is the same as the processing chips 114 and 124 in Figure 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] 14, a power management module 611 manages power to the processor 610 and / or the transceiver 630. A battery 612 provides power to the power management module 611. A display 613 outputs results processed by the processor 610. A keypad 614 receives inputs used by the processor 610. The keypad 614 can be displayed on the display 613. A SIM card 615 is an integrated circuit used to securely store an international mobile subscriber identity (IMSI) and associated keys used to identify and authenticate a subscriber on mobile phone devices such as mobile phones and computers.

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

[0174] In the following, technical features that can be applied to the EHT standard can be described.

[0175] According to one embodiment, the EHT standard supports PPDU with a bandwidth of 320 MHz. 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 channel.

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

[0177] According to one embodiment, the 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 the 320 MHz PPDU.

[0178] According to one embodiment, 12 and 11 null tones may be configured at the leftmost and rightmost positions, respectively, in each 160 MHz segment for a non-OFDMA tone plan of a 320 MHz PPDU.

[0179] According to one embodiment, 12 and 11 null tones may be configured at the leftmost and rightmost positions, respectively, in each 160 MHz segment for a non-OFDMA tone plan of 320 / 160+160 MHz PPDU.

[0180] According to one embodiment, the data portion of the EHT PPDU may use the same subcarrier spacing as the data portion of the 11ax standard.

[0181] In the following, technical features related to a Resource Unit (RU) that can be applied to the EHT standard will be described.

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

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

[0184] For example, an RU with 242 tones or more may be defined / configured as a large size RU. As another example, an RU with fewer than 242 tones may be defined / configured as a small size RU.

[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 an embodiment, the combination of small size RUs may be configured so as not to exceed the 20 MHz channel boundary. For example, the combination of small size RUs may be RU106+RU26 and RU52+RU26.

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

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

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

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

[0192] 15, the shaded 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, at 40 MHz, an example of consecutive RU26 and RU52 can be illustrated via FIG.

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

[0195] 16, the shaded RU26 and RU52 may be combined. For example, the second RU26 and the second RU52 may be combined. As another example, the eighth RU26 and the third RU52 may be combined. As another example, the eleventh RU26 and the sixth RU52 may be combined. As another example, the seventeenth RU26 and the seventh RU52 may be combined.

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

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

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

[0199] 17, 80 MHz can be divided into a first 40 MHz and a second 40 MHz. For example, within the first 40 MHz, the eighth RU 26 and the third RU 52 can be combined. As another example, within the first 40 MHz, the eleventh RU 26 and the sixth RU 52 can be combined. As another example, within the second 40 MHz, the eighth RU 26 and the third RU 52 can be combined. As another example, within the second 40 MHz, the eleventh RU 26 and the sixth RU 52 can be combined.

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

[0201] Large-size RUs

[0202] According to one embodiment, in the case of a single STA with 320 MHz OFDMA transmission, large size RU combining may only be allowed within the primary 160 MHz or secondary 160 MHz. For example, the primary 160 MHz may be comprised of the primary 80 MHz and secondary 80 MHz. The secondary 160 MHz may be comprised of channels excluding the primary 160 MHz.

[0203] According to one embodiment, in the case of a single STA with 240 MHz OFDMA transmission, large size RU combining may only be allowed within 160 MHz, which may consist of two adjacent 80 MHz channels.

[0204] According to one embodiment, in the case of a 160+80 MHz OFDMA transmission, in the case of a single STA, large size RU combining may only be allowed within the contiguous 160 MHz or the remaining 80 MHz.

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

[0206] [Table 8]

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

[0208] [Table 9]

[0209] In 80 MHz non-OFDMA, large size 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 size RU combinations configured as shown in Table 11 can be supported. In 160 MHz non-OFDMA, puncturing can be applied. For example, one of eight 242 RUs can be punctured. As another example, one of four 484 RUs can be punctured.

[0212] [Table 11]

[0213] In 240 MHz non-OFDMA, large size RU combinations configured as shown in Table 12 can be supported. In 240 MHz non-OFDMA, puncturing can be applied. 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] In 320 MHz non-OFDMA, large size RU combinations configured as shown in Table 13 can be supported. In 320 MHz non-OFDMA, puncturing can be applied. 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 will explain technical features related to the operating mode.

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

[0219] According to one embodiment, an EHT STA (or HE STA) can operate in an 80 MHz channel width mode. For example, in the 80 MHz channel width mode, the EHT STA can operate with a reduced operating channel width of 80 MHz using an operating mode indication (OMI).

[0220] According to one embodiment, the EHT STA can support subchannel selective transmission (SST), which can quickly select and switch between different channels during transmission to accommodate fading in narrow subchannels.

[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 320 MHz), 16 streams, and multi-band operation.

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

[0223] EHT PPDU Configuration

[0224] A new frame format may be used to support a transmission method based on the EHT standard. When a signal is transmitted through the 2.4 / 5 / 6 GHz band using the new frame format, not only a receiver supporting the EHT standard but also a conventional Wi-Fi receiver (or STA) (e.g., a receiver according to the 802.11n / ac / ax standard) can receive the EHT signal transmitted through 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, an embodiment in which the preamble of the PPDU based on the EHT standard is configured will be described. Hereinafter, the PPDU based on the EHT standard will be described as an EHT PPDU. However, the EHT PPDU is not limited to the EHT standard. The EHT PPDU can include a PPDU based on not only the 802.11be standard (i.e., the EHT standard) but also a new standard that is an advance / evolve / extension of the 802.11be standard.

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

[0227] 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. 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 may be configured in such a structure that the L-part 1810 is transmitted before the EHT-part 1820 for coexistence or backward compatibility with legacy STAs (STAs according to the 802.11n / ac / ax standard). For example, the L-part 1810 may include an L-STF, an L-LTF, and an L-SIG. For example, phase rotation may be applied to the L-part 1810.

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

[0230] For example, four extra subcarriers may be applied to the L-SIG and the RL-SIG. The extra subcarriers may be configured as [-28, -27, 27, 28]. The extra subcarriers may be modulated in a BPSK scheme. Also, coefficients of [-1 -1 -1 1] may be mapped to the extra subcarriers.

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

[0232] The fields in FIG. 18 are the same as those described in FIG.

[0233] The following describes technical features that can be further improved in this specification.

[0234] A 6 GHz band may be newly set in a wireless LAN system. The 6 GHz band may include 20 / 40 / 80 / 160 / 320 MHz channels in the frequency domain described in FIG. 12. For example, when transmitting and receiving a signal in an indoor environment through the 6 GHz band, low power transmission must be performed. That is, the transmission power of a wireless LAN signal may be limited due to the existing transceiver used in the 6 GHz band. As a result, when transmitting and receiving a PPDU (e.g., the EHT PPDU) through the 6 GHz band, a problem of shortening the transmission range may occur due to the low power transmission. Therefore, this specification proposes a transmission and reception technique for range extension. Meanwhile, an example of this specification is preferably applied to PPDU transmission and reception in the 6 GHz band, but may also be used in other bands where a problem of shortening the 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 a transmit / receive PPDU. In other words, an example of this specification proposes various transmit / receive PPDUs for range extension. Examples of the transmit / receive PPDUs may include various fields described in Figures 3, 7, 8, 13, 18, and 19.

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

[0237] Various technical features for range extension may 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 (eg, U-SIG field) and the second control signal field (eg, EHT-SIG field) will be described in detail.

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

[0240] The transmission / reception 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 in consideration of backward compatibility is the PPDU in FIG. 18.

[0241] FIG. 19 illustrates an example of a first control signal field or U-SIG field herein.

[0242] As shown, the first control signal field (e.g., U-SIG field) may include a version independent field 1910 and a version dependent field 1920. For example, the version independent field 1910 may include control information that is persistently included regardless of the version of the wireless LAN (e.g., IEEE 802.11be and the next generation standard of 11be). For example, the version dependent field 1920 may include control information that is dependent on the corresponding version (e.g., the IEEE 802.11be standard).

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

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

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

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

[0247] [Table 14]

[0248] The first control signal field (e.g., U-SIG field) may 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) may be fixed or preset (e.g., fixed or preset to 48 / 52 bits, etc.). Therefore, there may be information that is not included in the first control signal field (e.g., U-SIG field), and such information may be called by various names such as overflowed information, overflow information, U-SIG overflow, and U-SIG overflow information / field. According to an example of the present specification, the overflowed information is preferably included in the second control signal field (e.g., EHT-SIG field). In addition, since the overflowed information is not user specific information, the corresponding information is preferably included in a Common field of the second control signal field (e.g., EHT-SIG field).

[0249] Below, we will explain some examples of various technical features for range extension.

[0250] Feature 1: An example of a PPDU for range extension is proposed below. An EHT PPDU to which technical features related to range extension are applied can be represented by various names such as "11be ER PPDU", "EHT ER PPDU", "ER PPDU", "ER transmission signal", "ER transmission", etc. In addition, since a duplication technique for some fields / RUs of a PPDU can be applied for range extension, a PPDU for range extension can be configured based on a duplicate transmission mode. That is, the "ER PPDU" can also be represented by a PPDU configured based on the duplicate transmission mode.

[0251] In the present specification, the term "ER PPDU" may refer to various formats of PPDU for ER transmission. In the present specification, the term "ER PPDU" may include a signal field supporting a normal SU / MU mode (e.g., a U-SIG field for an EHT MU PPDU) or may include a signal field separately designed for an ER mode. Meanwhile, the technical features presented below may be applied to not only the IEEE 802.11be standard but also other WLAN standards.

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

[0253] Feature 1. The aiPPDU type field can be configured with 2-bit information. In this case, one entry of the 2-bit information can indicate an extend range PPDU.

[0254] For example, in the 2-bit information, a first value (e.g., 00) may indicate a SU PPDU, a second value (e.g., 01) may indicate a MU-PPDU, a third value (e.g., 10) may indicate a TB PPDU, and a fourth value (e.g., 11) may indicate the ER PPDU. Only a part of the multiple values ​​mentioned above may be used.

[0255] Feature 1.ai1.a. For example, it is also possible to indicate SU-PPDU and MU-PPDU via one and the same entry (ie, the first value) in the 2-bit information.

[0256] Feature 1.ai1.b. For example, the ER PPDU may be composed of a SU / MU PPDU.

[0257] As another example of feature 1.a.ii., 3-bit information in a first control signal field (e.g., a U-SIG field) may be used. For example, the 3-bit information may be configured of two consecutive subfields. For example, the 3-bit information may be configured through a first subfield related to a PPDU type consisting of 2 bits and a second subfield consisting of 1 bit. The second subfield may include information on a HARQ operation applied to a transmitted / received PPDU (e.g., information on a Redundancy Version, a New Data Indicator, and a HARQ processor number) and / or information on a Multi-AP communication technique applied to a transmitted / received PPDU. For example, the 3-bit information may be configured of one subfield, and at least one entry (i.e., at least one preset value) of the one subfield may include information on a PPDU type, and at least one other entry may include information on the HARQ operation (e.g., information on a Redundancy Version, a New Data Indicator, and a HARQ processor number) and / or information on a Multi-AP communication technique applied to a transmitted / received PPDU.

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

[0259] In order to increase the robustness of a first control signal field (e.g., a U-SIG field) including common information, the first control signal field (e.g., a U-SIG field) can be repeated in the time domain. For example, the first control signal field (e.g., a U-SIG field) consisting of two consecutive symbols can be repeated to be composed of a total of four symbols.

[0260] Below, feature 1.ci, an example is described in which symbols for the first control signal field (e.g., U-SIG field) are repeated.

[0261] Feature 1.ci1. For example, the first control signal field (e.g., U-SIG field) can be repeated in units of two symbols. FIG. 20 shows an example in which symbols for the first control signal field are repeated. As shown, the same two symbols (e.g., U-SIG-1 and U-SIG-2) can be consecutively positioned in the two symbols (e.g., U-SIG-1 and U-SIG-2) for the first control signal field.

[0262] Feature 1.ci2. For example, the first control signal field (e.g., U-SIG field) can be repeated in units of one symbol. FIG. 20 is another example in which symbols for the first control signal field are repeated. As shown, the first symbol (e.g., U-SIG-1) of the two symbols for the first control signal field can be repeated, and then the remaining symbol (e.g., U-SIG-2) can be repeated.

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

[0264] Feature 1.c.ii.1. For example, it is possible to apply no interleaving to the symbols for the repeated first control signal field, or to apply a bipolar technique, or to multiply a specific sequence.

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

[0266] Feature 1.c.iii. Similar to the example described above, the following describes an example in which a second control signal field (eg, an EHT-SIG field) is repeated in the time domain.

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

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

[0269] As another example of feature 1.d, a value of a PPDU type field configured in the first control signal field (e.g., U-SIG field) may have a preset value for an ER PPDU, and a lower level of MCS (e.g., an MCS level to which DCM and BPSK techniques are applied) compared to a conventional MCS0 level may be applied to the first control signal field (e.g., U-SIG field). In this case, the first control signal field (e.g., U-SIG field) may be configured using 4 symbols.

[0270] Feature 1.di In the above example, since an 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, a technique for range extension (e.g., a technique in which 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., an EHT-SIG field).

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

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

[0274] Feature 1.fi Symbols for the first control signal field (eg, a U-SIG field) may be repeated in the time domain, as in Feature 1.C above.

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

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

[0277] Feature 1.f.iv. Figure 23 shows an example where the first and second control signal fields are repeated. The example of Figure 23 relates to an 80 MHz PPDU. As shown, the first control signal field may be repeated / replicated in the time domain and the second control signal field may be repeated / replicated in the frequency domain.

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

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

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

[0281] Feature 1.gi For example, the 26-tone RU, 52-tone RU, 106-tone RU, and 242-tone RU (or RU26, RU52, RU106, RU242, etc.) shown in FIG. 4 can be aggregated in various manners. For example, multiple RUs can be aggregated in various manners based on the example of FIG. 15. The RU PPDU of this specification can support various RU aggregations.

[0282] Feature 1.g.ii. For example, the sizes of RUs available for use in an ER PPDU in this specification are as follows:

[0283] As an example of feature 1.g.ii.1.1, all sizes of RUs can be used for the ER PPDU of this specification. For example, RU26, RU52, RU26+RU52 (i.e., an RU in which a 26-tone RU and a 52-tone RU are aggregated), RU106, RU106+RU26, and RU242 can all be used.

[0284] For example, any one of the available RU sizes (e.g., the six sizes described above) can be applied to a specific ER PPDU, i.e., the data field of a specific ER PPDU can be configured with RUs of a certain size.

[0285] According to an example of feature 1.g.ii.2.2, only RUs with a size of 106-tone or greater can be used for ER PPDU.

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

[0287] According to another example of feature 1.g.ii.2.b., only RU 106 and RU 242, 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 regarding the size of the available RUs for data transmission of the ER PPDU can be transmitted via the first / second control signal field (i.e., U-SIG and / or EHT-SIG).

[0289] Feature 1.g.ii.3.a. For example, information on the size of available RUs for data transmission of an ER PPDU may be included in an ER allocation field, which may be included in a first / second control signal field. The ER allocation field may be composed of 1 bit or 2 bits and may be referred to 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 106-tone RUs may be used for the data signal / field of the ER PPDU, etc.

[0290] [Table 15]

[0291] Feature 1.g.iii. As described above, when a RU of a specific size is used to transmit a data signal / field of an ER PPDU, the following technical features may additionally be 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 pre-configured 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 at the leftmost position can be used. For example, when RU106+RU26 are used, the RU106 located at the leftmost position and RU26 located 5th from the leftmost position can be used. The positions of the pre-configured RUs (i.e., RU106 or RU106+RU26) can be changed.

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

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

[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 (e.g., the RU size indicated by the ER allocation field) used based on the ER PPDU 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] According to the above example, the same data is repeated / replicated in RUs of the same size, which has the advantage of generating diversity and repetition gain.

[0299] Feature 1.g.iv. Additionally or alternatively, when configuring the ER PPDU, the data signal can be repeated in units of 20 MHz.

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

[0301] Feature 1.g.iv.2. Below, an example in which 80MHz ER PPDU is used is described.

[0302] Feature 1.g.iv.2.a. Figure 24 shows an example of data field repetition for wide bandwidth transmission. As shown, the 242-tone RU is repeated / duplicated so that a total of four identical 242-tone RUs can be transmitted.

[0303] In the example described above, DCM for the data field can be applied. For example, the 242-tone RU in FIG. 24 is an RU to which DCM is applied.

[0304] In the above-mentioned example, the STF and LTF (i.e., EHT-STF and EHT-LTF) can be configured using a sequence corresponding to the full bandwidth. For example, as shown in FIG. 24, when repetition / duplication is applied to the data field of the 80 MHz PPDU, it is preferable to use the EHT-STF sequence and EHT-LTF sequence preset for 80 MHz.

[0305] According to another example of feature 1.g.iv.2.d., it is possible to set STF and LTF sequences based on 20 MHz, i.e., it is possible to use EHT-STF and EHT-LTF sequences already set for the 20 MHz band.

[0306] Feature 1.g.iv.2.e. When a data field is duplicated / repeated, the problem of increased PAPR can occur. To reduce the PAPR, phase rotation can be applied to the 20 MHz frequency segment. 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] For example, a phase rotation sequence of [1 -1 -1 -1] can be applied to the data field of an 80 MHz ER PPDU.

[0308] For example, a phase rotation sequence of [1 -1 -1 -1 1 -1 -1 -1] can be applied to the data field of a 160 MHz ER PPDU.

[0309] The above-mentioned phase rotation operation can be applied to the STF / LTF of the ER PPDU. Specifically, if 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 be applied to the STF / LTF as well.

[0310] The size of the RU, the number of repeated / replicated RUs, and the bandwidth of the PPDU used in the above example can be changed. For example, the data field can be repeated / replicated 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 repeated / replicated.

[0311] For example, when the total bandwidth of the ER PPDU is N, it is preferable that 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 duplicated / repeated in frequency. The bandwidth can be variously set to 80 / 160 / 320 MHz, etc., and the size of one RU can also be variously set to 484 / 996 / 2x996-tone RU, etc.

[0312] Feature 1.gv1.a. For example, when configuring a 40 MHz ER PPDU, one RU for the data field may be set based on a 20 MHz bandwidth. That is, it is preferable that a 242-tone RU corresponding to the 20 MHz bandwidth is included in the data field and duplicated / repeated in frequency. For example, when configuring an 80 MHz ER PPDU, one RU for the data field may be set based on a 40 MHz bandwidth. That is, it is preferable that a 484-tone RU corresponding to the 40 MHz bandwidth is included in the data field and duplicated / repeated in frequency.

[0313] Feature 1.gv1.b. When one RU is replicated / repeated as described above, the reception performance can be improved by about 3 dB, which has the effect of extending the transmission and reception range.

[0314] Feature 1.gv1.c. As described above, when an RU included in a data field is repeated / duplicated, it is preferable that the STF / LTF (e.g., EHT-STF / EHT-LTF) is set based on the total bandwidth of the ER PPDU. For example, when an 80 MHz ER PPDU is configured, it is preferable that a 484-tone RU is used in the data field instead of a 996-tone RU, and the STF / LTF uses a sequence with an 80 MHz bandwidth instead of a 40 MHz bandwidth. In other words, it is preferable that the STF / LTF is configured based on a pre-configured STF / LTF sequence (e.g., an 80 MHz EHT-STF / LTF sequence) for the total bandwidth of the PPDU (e.g., 80 MHz).

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

[0316] Also, when a 320MHz ER PPDU is configured, it is preferable that a 2*996-tone RU is used in the data field instead of a 4*996-tone RU, and that a 320MHz bandwidth sequence is used in the STF / LTF instead of a 160MHz bandwidth sequence. In other words, it is preferable that the STF / LTF is configured based on a preset STF / LTF sequence (e.g., a 320MHz EHT-STF / LTF sequence) for the total bandwidth (e.g., 320MHz) of the PPDU.

[0317] Figure 25 is an example of an ER PPDU including an STF / LTF field set based on the total bandwidth. As shown, the total bandwidth of the ER PPDU is 80 MHz, and therefore, 484-tone RUs are included in the data field, and the corresponding 484-tone RUs are duplicated in frequency. That is, RUs corresponding to half of the total bandwidth (i.e., 40 MHz) are allocated to the data field. However, the STF / LTF is configured based on the STF / LTF sequence preset for the total bandwidth, i.e., the 80 MHz EHT-STF / LTF sequence.

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

[0319] If the STF / LTF is replicated in the same manner as the RU, the following problems may occur. For example, if the total bandwidth of the ER PPDU is 80 MHz and the STF / LTF is based on a 20 / 40 MHz sequence, additional indication / signaling is required that the STF / LTF is generated and replicated based on a partial bandwidth rather than the total bandwidth. In addition, the tone allocation (or RU location) associated with the total bandwidth may not be accurately aligned with the tone allocation (or RU allocation) associated with the partial bandwidth. For example, since the 80 / 160 / 320 MHz tone allocation defined in a WLAN system does not exactly match the 20 MHz tone allocation, the performance of channel estimation for some tones may be degraded if a 20 MHz STF / LTF sequence is used while transmitting an 80 / 160 / 320 MHz ER PPDU. For this reason, it is preferable that the STF / LTF is generated based on the total bandwidth as shown in FIG. 25.

[0320] Feature 1. In order to reduce the PAPR problem caused by duplication of gv1.diRU, phase rotation is preferably applied. For example, phase rotation can be applied to the data field, STF, and / or LTF. Phase rotation operation can be applied in duplicated BW / RU units.

[0321] For example, if an 80MHz (or 160MHz) ER PPDU is replicated in 40MHz units (or 80MHz units), phase rotation can be performed in 40MHz units (or 80MHz units). In this case, the phase rotation sequence can be [1 j], [1 -1], [-1 1], [1 -j], etc.

[0322] Feature 1.gv1.e. For example, the transmission format (or duplication format) of the ER PPDU may be indicated via a subfield of a U-SIG field. For example, it may be indicated via a BW field and / or a PPDU-type field in a U-SIG field. For example, when an 80 MHz ER PPDU is transmitted, the BW field may have a preset value for 80 MHz, and the PPDU-type field may have a preset value (e.g., 11) for an Extended Range format (or duplication format). A receiving STA may know that the received PPDU is an 80 MHz signal via the BW field of the received PPDU, and may 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 duplicated in frequency) via the type field.

[0323] The specific RU size, bandwidth, etc. described above can be modified. That is, various repetition granularity (or duplication granularity) can be considered for the ER PPDU.

[0324] Feature 1.gv2.a. For example, Repetition granularity can be considered 20 / 40 / 80 / 160MHz sub-channel or 242 / 484 / 996 / 2x996-tone.

[0325] Feature 1.gv2.b. When various repetition granularities are supported, additional information is required to indicate the granularity. For example, information regarding the repetition granularity can be indicated through the following two-bit information. The following two-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 may be repeated / replicated in 20 MHz units (or 242-tone units). For example, as in the example of FIG. 25, when the RU is repeated / replicated in 20 MHz units (or 242-tone units), i.e., when the Repetition granularity is 40 MHz (or 484-tone), the second-bit information may have a second value (e.g., 01).

[0328] The 2-bit information may be configured to reuse an existing field in the first / second control signal field or to define a new entry in an existing field. For example, the following methods may be considered.

[0329] Feature 1.gv2.ci For 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, only modulation of BPSK and QPSK techniques can be applied to the data field of the ER PPDU, and thus only low MCS levels (e.g., conventional MCS0, MCS1, MCS2 levels) can be considered. For example, when the MCS field is composed of 4 bits (b0, b1, b2, b3), the two MSB bits (i.e., b0, b1) contain information on duplication / repetition granularity, and the two LSB bits (i.e., b2, b3) can contain information on MCS. That is, since a limited number of modulation techniques are used like the low MCS level, it is possible to indicate information on MCS through only the two LSB bits. The length of the MCS field can be changed and can be included in the first / second control signal field.

[0330] As another example of feature 1.gv2.c.ii., only MCS0 may be used for the data field of an ER PPDU. In this case, the MCS field may be used to indicate duplication / repetition granularity. Also, only some entries of the MCS field value may include information related to duplication / repetition granularity. For example, the PPDU type field may include a preset value indicating an ER PPDU, and some entries (e.g., 0: 20 MHz, 1: 40 MHz, 2: 80 MHz, 3: 160 MHz, 4-15: reserved) of the MCS field value may include information related to duplication / repetition granularity.

[0331] Feature 1.gv2.c.iii. For example, a spatial stream (SS) for transmitting an ER PPDU may be fixed to 1 and used. Information on the number of SSs (i.e., NSTS or Number of Space Time Stream) may be included in the first / second control signal field. Thus, the conventional subfield related to NSTS may be used to indicate duplication / repetition granularity. Thus, the subfield related to NSTS included in the first / second control signal field may indicate duplication / repetition granularity when transmitting an ER PPDU, and may include information on the number of SSs when transmitting a different type of PPDU other than an ER PPDU.

[0332] Feature 1.gv2.c.iii.1. For example, when an ER PPDU is transmitted, the subfield containing information about the NSTS can indicate duplication / repetition granularity via a specific value (0: 20 MHz, 1: 40 MHz, 2: 80 MHz, 3: 160 MHz, 4 to 15: reserved).

[0333] Feature 1.gv3. In order to reduce the signaling overhead associated with the 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.gv3.a. For example, to ensure a minimum data rate, the size of the duplicated unit can be 20 / 40 / 80MHz.

[0335] For example, when an ER PPDU is transmitted over a wide bandwidth, the duplicated unit included in the corresponding PPDU can be repeated / replicated in 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 / replicated 2 / 4 / 8 times in 40 MHz units.

[0336] Feature 1.gv3.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 STF / LTF sequence previously set for the total bandwidth of the corresponding PPDU.

[0337] Unlike the feature 1.gv3.d., the STF and LTF can be repeated and transmitted in duplicated units. For example, in the case of duplication in 40 MHz units, the STF and LTF are configured as a 40 MHz sequence and are repeatedly transmitted within the BW.

[0338] Feature 1.gv4. For example, in an IEEE 802.11be system, 80 MHz transmission can be the primary unit. This means that an ER PPDU can be applied only to an 80 MHz BW. In this case, the data field included in the ER PPDU is duplicated / repeated in frequency in 20 / 40 MHz units, resulting in the same data field being included 4 / 2 times.

[0339] Feature 1.gv4.a. Even when a PPDU having an 80 MHz bandwidth is used as described above, it is preferable that the EHT-STF included in the corresponding PPDU is configured based on the 80 MHz STF sequence, and the ETH-LTF included in the corresponding PPDU is configured based on the 80 MHz LTF sequence, as described above.

[0340] Alternatively, it is possible to repeat the STF / LTF in the same manner as the data field to obtain a combine gain for the STF and LTF. That is, to configure the STF / LTF, the STF / LTF signal can be generated based on the 20 / 40MHz sequence and repeated 4 / 2 times in frequency.

[0341] Feature 1.gv4.c. For example, if a specific unit (e.g., data RU, STF, LTF) is repeated / replicated in frequency, the PAPR can increase. To solve this, if a specific unit is repeated / replicated in 20 / 40 MHz units, a specific phase rotation sequence can be applied to the replicated / replicated units. For example, [1 -1 -1 -1] can be applied to units replicated / replicated in 20 MHz units, and [1 j] can be applied to units replicated / replicated in 40 MHz units.

[0342] In the above example of feature 1.gv4.d., when a specific unit is duplicated / repeated in 20 MHz units, signal transmission based on duplication / repetition is possible only for the primary 40 MHz band / channel for power boosting.

[0343] Feature 1.gv4.e. Figure 26 shows an example of a PPDU in which duplication / repetition is performed only on a specific unit. As shown, a specific unit (i.e., data RU, STF, LTF) can be duplicated / repeated in frequency in 20 MHz units. In this case, as shown, the corresponding unit is transmitted only on the primary 40 MHz band / channel, and power boosting can be applied to the transmitted unit. Power boosting for the unit can be performed by about N dB (e.g., 1 / 2 / 3 dB).

[0344] The above example can be modified in various ways. For example, the PPDU can be configured based only on the primary 20 MHz band / channel, not the primary 40 MHz band / channel.

[0345] Feature 1.gv5.a. Figure 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 to the STF / LTF / data-field (e.g., power boosting based on NdB).

[0346] Feature 1.gv5.b As described above, the DCM technique can be applied to the data field of the PPDU according to this specification. Therefore, the 242-tone RU in FIG. 26 / FIG. 27 is an RU to which the DCM technique is applied.

[0347] The various technical features described above may 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 PPDU includes duplicated / repeated RUs, but some fields (e.g., STF / LTF / data fields) 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] Additionally or alternatively, some fields (e.g., STF / LTF / data fields) in an ER PPDU may be repeated / replicated in 80 MHz units. For example, some fields (e.g., STF / LTF / data fields) of a 160 MHz ER PPDU may be repeated in 80 MHz units to include a total of two data fields, and some fields (e.g., STF / LTF / data fields) of a 320 MHz ER PPDU may be repeated in 80 MHz units to include a total of four data fields.

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

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

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

[0353] According to an example of this specification, the following operations can be performed in the STA.

[0354] Fig. 28 is a procedure flow diagram illustrating the operations performed in a transmitting STA. The transmitting STA that performs the operations in Fig. 28 may be an AP STA or a non-AP STA.

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

[0356] The transmitting STA configures a transmit PPDU (e.g., the above-mentioned ER PPDU) according to an example of this specification. The transmit PPDU may include a first control signal field for interpreting the transmit PPDU, a short training field (STF), a long training field (LTF), and a data field. 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 the 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) includes a total of 26 bits composed of B0 to B25 bits. In the first symbol (U-SIG-1), B0 to B2 bits are PHY Version Identifier and may include information on the PHY version of the transmit PPDU, B3 to B5 bits include bandwidth information, B6 bit includes UL / DL indicator, B7 to B12 bits include BSS identification information for the transmit PPDU, and B13 to B19 bits include duration information of a TXOP related to the transmit PPDU, and the duration of the TXOP may be used for NAV setting of another STA. Also, B20 to B25 bits may be used for functions defined later. Also, in the second symbol (U-SIG-2), bits B0 to B1 include information regarding PPDU type and / or information regarding compression mode, bit B2 may be used for a function defined later, bits B3 to B7 include information regarding a punctured channel, bit B8 may be used for a function defined later, bits B9 to B10 may include MCS information to be applied to the second control signal field (e.g., the EHT SIG field), bits B11 to B15 include information related to the number of symbols for transmitting the second control signal field, bits B16 to B19 include a CRC (i.e., a CRC calculated based on a total of 26 bits of U-SIG-1 and bits B0 to B15 of U-SIG-2), and bits B20 to B25 may include 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 an ER preamble may include all or a part of the U-SIG field of the EHT MU PPDU.

[0359] The U-SIG field of the EHT MU PPDU may be transmitted through a total of two symbols (e.g., two 4us symbols), and each symbol may be configured based on BPSK constellation mapping. In contrast, the U-SIG field of the ER preamble may be transmitted through a total of four symbols (e.g., four 4us symbols), and U-SIG-1 may be repeatedly transmitted through two symbols (the 1st / 2nd symbols of the total four symbols), and U-SIG-2 may also be repeatedly transmitted through two symbols (the 3rd / 4th symbols of the total four symbols). In this case, BPSK constellation mapping may be applied to the 1st / 3rd / 4th symbols of the total four symbols, and QBPSK constellation mapping (i.e., mapping rotated 90 degrees counterclockwise with respect to BPSK) may be applied to the 2nd symbol.

[0360] For example, the first control signal field (i.e., the U-SIG field) may include a type field including a type value associated with the duplicate transmission mode. For example, the type field may be bits B0 to B1 of the U-SIG-2. A receiving STA may know that an ER PPDU is received (i.e., that a transmitting STA transmits a PPDU based on a duplicate transmission mode) through the type field. Meanwhile, the type field is merely an example of a signaling technique for indicating the ER PPDU, and the ER PPDU may be indicated by a method other than the type field.

[0361] More specifically, when the B6 bit (i.e., the UL / DL indicator) of the U-SIG-1 has a preset value for DL ​​(e.g., '0') and the B0 to B1 bits (i.e., the above-mentioned PPDU type field) of the U-SIG-2 have a specific first value (e.g., '1'), it may be indicated that the corresponding PPDU is used for a single user or for a null data packet (NDP). Also, when the ER PPDU is transmitted (i.e., when the duplicate transmission mode is used), the B0 to B1 bits (i.e., the above-mentioned PPDU type field) of the U-SIG-2 may have the first value (e.g., '1'). As a result, as described above, one entry of the PPDU type field may 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] Meanwhile, when the transmit / receive PPDU is used for DL ​​OFDMA communication other than ER PPDU, the B0 to B1 bits of the U-SIG-2 (i.e., the PPDU type field) may 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] Meanwhile, when the transmit / receive PPDU is used for DL ​​MU-MIMO (i.e., non-OFDMA) communication other than ER PPDU, the B0 to B1 bits of the U-SIG-2 (i.e., the PPDU type field) may 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 (ie, the U-SIG field) may be duplicated per 20 MHz on frequency, as shown in the example of FIG.

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

[0367] The data field may include a first data RU including tones for half the total bandwidth of the transmission 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. When a 160 MHz PPDU is transmitted, the first data RU is a 996-tone RU. 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, a data RU including half the tones of the 80 MHz band is a 484-tone RU. When the total bandwidth is 160 MHz, a data RU including half the tones of the 160 MHz band is a 996-tone RU. When the total bandwidth is 320 MHz, a data RU including half the tones of the 320 MHz band is a 2*996-tone RU.

[0368] For example, partial phase rotation for PAPR reduction may be applied to the duplicated second data RU. For example, the first half of the tones of the second data RU may be multiplied by -1, and the remaining half of the tones may be multiplied by +1. In other words, a [-1 1] based phase rotation may 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 may be modulated based on the BPSK technique. It is also preferable that a dual carrier modulation (DCM) technique is applied to each of the first and second data RUs. That is, since DCM, BPSK, and frequency duplication are all applied to the data RUs included in the ER PPDU of the present specification, more robust transmission can be supported compared to the conventional technique. 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 on MCS, coding, number of streams, etc. applied to each of the first and second data RUs may be included in the user field of the user specific field. The user field may include various control bits. For example, in the user field, B0 to B10 bits include identification information on a receiving STA of the ER PPDU, B11 to B14 bits include preset values ​​for indicating BSPK and DCM applied to the ER PPDU, B16 to B19 bits include information on the number of spatial streams applied to the ER PPDU (i.e., a preset value for indicating one stream), B20 bit includes information related to beamforming applied to the ER PPDU, and B21 bit includes a preset value for indicating LDPC coding applied to the ER PPDU.

[0371] The STF may be configured based on a preset STF sequence for the total bandwidth of the PPDU. For example, if the total bandwidth of the ER PPDU is 80 MHz, the STF may be configured based on a preset STF sequence for the 80 MHz bandwidth. That is, the coefficient of the STF sequence for the 80 MHz bandwidth exists for every 16 subcarriers from subcarrier index -496 to subcarrier U index 496, and may be expressed as STF Sequence_(-496:16:496)={M, 1, -M, 0, -M, 1, -M}*(1+j) / SQRT(2). For example, the M sequence may be defined as {-1, -1, -1, 1, 1, 1, -1, 1, 1, 1, -1, 1, 1, -1, 1}. Also, if the total bandwidth of the ER PPDU is 160 / 320 MHz, the STF may be configured based on a preset STF sequence for the 160 / 320 MHz bandwidth.

[0372] The LTF may also be configured based on a preset LTF sequence for the total bandwidth of the PPDU. For example, if the total bandwidth of the ER PPDU is 80 MHz, the LTF may be configured based on a preset LTF sequence for the 80 MHz bandwidth. Also, if the total bandwidth of the ER PPDU is 160 / 320 MHz, the LTF may be configured based on a preset LTF sequence for the 160 / 320 MHz bandwidth.

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

[0374] The operations of Figure 28 may be performed by the apparatus of Figure 1 and / or Figure 14. For example, the transmitting STA may be embodied in the apparatus of Figure 1 and / or Figure 14. The processor of Figure 1 and / or Figure 14 may perform the operations of Figure 28 described above. Also, the transceiver of Figure 1 and / or Figure 14 may perform the operations described in Figure 28.

[0375] In addition, the device proposed in the present specification does not necessarily have to include a transceiver, and can be embodied in the form of a chip including a processor and a memory. Such a device can generate / store a transmission PPDU according to the above-mentioned example. Such a device can be connected to a separately manufactured transceiver to support actual transmission and reception.

[0376] Figure 29 is a procedural flow diagram illustrating operations performed at a receiving STA. The operations of Figure 29 can be performed by a user STA or an AP STA.

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

[0378] The receiving STA may decode a received physical protocol data unit (PPDU) 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 related to the PPDU version, the PPDU bandwidth, the PPDU type, the second control signal field, etc., as described above. The receiving STA may start decoding the received PPDU based on the information in the first control signal field. Additionally, the receiving STA may decode the second control signal field based on various information (e.g., MCS information related to a data field, etc.) included in the second control signal field, and decode user data included in the data field based on the decoded information.

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

[0380] The technical features of the present specification described above can be applied to various applications and business models. For example, the technical features described above can be applied to wireless communication in devices that support artificial intelligence (AI).

[0381] Artificial intelligence refers to the field that studies artificial intelligence or the methodology that can create it, and machine learning refers to the field that defines various problems that are dealt with in the field of artificial intelligence and studies the methodology to solve them. Machine learning can also be defined as an algorithm that improves the performance of any task through continuous experience with that task.

[0382] An artificial neural network (ANN) is a model used in machine learning, and can refer to any model with problem-solving capabilities that is 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 different layers, a learning process that updates model parameters, and an activation function that generates output values.

[0383] An artificial neural network can have an input layer, an output layer, and optionally one or more hidden layers. Each layer includes one or more neurons, and an artificial neural network can include synapses connecting the neurons. In an artificial neural network, each neuron can output a function value of an activation function for the input signal, weights, and biases input via synapses.

[0384] Model parameters are parameters that are determined through learning, and include weights of synaptic connections and biases of neurons, etc. Hyperparameters are parameters that must be set before learning in a machine learning algorithm, and include the learning rate, number of iterations, mini-batch size, initialization function, etc.

[0385] The objective of training an artificial neural network can be regarded as determining model parameters that minimize a loss function. The loss function can be used as an index for determining optimal model parameters during the training process of an artificial neural network.

[0386] Depending on the learning method, machine learning can be classified into supervised learning, unsupervised learning, and reinforcement learning.

[0387] Supervised learning refers to a method of training an artificial neural network when a label for training data is given, and the label can mean the correct answer (or result value) that the artificial neural network should infer when training data is input to the artificial neural network. Unsupervised learning can mean a method of training an artificial neural network when no label for training data is given. Reinforcement learning can mean a learning method of training an agent defined in an environment to select an action or action sequence that maximizes cumulative compensation 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, and deep learning is a part of machine learning. In the following, machine learning is used to include deep learning.

[0389] Furthermore, the above-described technical features can be applied to wireless communication of a robot.

[0390] A robot can mean a machine that automatically processes or operates a given task using its own capabilities. In particular, a robot that has the ability to recognize the environment and make its own decisions and take action can be called an intelligent robot.

[0391] Robots can be classified into industrial, medical, domestic, military, etc., depending on the purpose and field of use. Robots can perform various physical actions such as moving robot joints by having a driving part with an actuator or a motor. In addition, a mobile robot can run on the ground or fly in the air by using a driving part that includes wheels, brakes, propellers, etc.

[0392] Furthermore, the above-described technical features can be applied to a device that supports augmented reality.

[0393] Augmented reality is a collective term for virtual reality (VR), augmented reality (AR), and mixed reality (MR). VR technology provides real-world objects and backgrounds only as CG images, AR technology provides virtual CG images on real-world images, and MR technology is a computer graphics technology that combines and presents virtual objects in the real world.

[0394] MR technology is similar to AR technology in that it displays both real and virtual objects, but it differs in that AR technology uses virtual objects to complement real objects, whereas MR technology uses virtual objects and real objects with equal characteristics.

[0395] XR technology can be applied to HMDs (Head-Mount Displays), HUDs (Head-Up Displays), 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.

Claims

1. A method performed by a transmitting station (STA) of a wireless local area network (LAN), comprising: constructing a physical protocol data unit (PPDU) based on a duplicate transmission mode, The PPDU comprises: a universal signal (U-SIG) field for interpreting the PPDU; an extremely high throughput signal (EHT-SIG) field including a modulation and coding scheme (MCS) field and contiguous with the U-SIG field; A short training field (STF) following the EHT-SIG field; A long training field (LTF) that is continuous with the STF; and A data field is included that is contiguous with the LTF, the U-SIG field includes a type field having a type value associated with 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 duplicated on each 20 MHz subchannel within the 80 MHz PPDU; the data field includes a first 484-tone resource unit (RU) and a second 484-tone RU; the first 484-tone RU is duplicated to the second 484-tone RU; The STF is constructed based on the STF sequence already set for 80 MHz, The LTF is configured based on a LTF sequence already set for the 80 MHz; and transmitting the PPDU.

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

3. 2. The method of claim 1, wherein the first 484-tone RU contains user data for a single user.

4. 2. The method of claim 1, wherein the first 484-tone RU is modulated based on binary phase shift keying (BPSK) and dual carrier modulation (DCM) techniques.

5. the PPDU is an EHT PPDU, The type field has a length of 2 bits; The type field is a first value associated with the replica transmission mode; a second value associated with a downlink (DL) orthogonal frequency division multiple access (OFDMA) transmission; and The method of claim 1 , further comprising a third value associated with a non-OFDMA DL multi-user multiple input multiple output (MU-MIMO) transmission.

6. 2. The method of claim 1, wherein the PPDU is transmitted over a 6 GHz band without preamble puncturing.

7. A method performed by a receiving station (STA) of a wireless local area network (LAN), comprising: receiving a physical protocol data unit (PPDU), The PPDU is constructed based on a duplicate transmission mode; The PPDU comprises: a universal signal (U-SIG) field for interpreting the PPDU; an extremely high throughput signal (EHT-SIG) field including a modulation and coding scheme (MCS) field and contiguous with the U-SIG field; A short training field (STF) following the EHT-SIG field; A long training field (LTF) that is continuous with the STF; and A data field is included that is contiguous with the LTF, the U-SIG field includes a type field having a type value associated with 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 duplicated on each 20 MHz subchannel within the 80 MHz PPDU; the data field includes a first 484-tone resource unit (RU) and a second 484-tone RU; the first 484-tone RU is duplicated to the second 484-tone RU; The STF is constructed based on the STF sequence already set for 80 MHz, The LTF is configured based on a LTF sequence already set for the 80 MHz; and decoding the PPDU based on the U-SIG field.

8. The PPDU is an extremely high throughput (EHT) PPDU, The type field has a length of 2 bits; The type field is a first value associated with the replica transmission mode; a second value associated with a downlink (DL) orthogonal frequency division multiple access (OFDMA) transmission; and The method of claim 7, further comprising a third value associated with a non-OFDMA DL multi-user multiple input multiple output (MU-MIMO) transmission.

9. In a transmitting station (STA) of a wireless LAN (Local Area Network), a transceiver for transmitting radio signals; a processor for controlling the transceiver; The processor, Constructing a physical protocol data unit (PPDU) based on a duplicate transmission mode; The PPDU comprises: a universal signal (U-SIG) field for interpreting the PPDU; an extremely high throughput signal (EHT-SIG) field including a modulation and coding scheme (MCS) field and contiguous with the U-SIG field; A short training field (STF) following the EHT-SIG field; A long training field (LTF) that is continuous with the STF; and A data field is included that is contiguous with the LTF, the U-SIG field includes a type field having a type value associated with 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 duplicated on each 20 MHz subchannel within the 80 MHz PPDU; the data field includes a first 484-tone resource unit (RU) and a second 484-tone RU; the first 484-tone RU is duplicated to the second 484-tone RU; The STF is constructed based on the STF sequence already set for 80 MHz, The LTF is configured based on the LTF sequence already set for the 80 MHz; A transmitting STA adapted to transmit the PPDU via the transceiver.

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

11. In a receiving station (STA) of a wireless LAN (Local Area Network), a transceiver for transmitting radio signals; a processor for controlling the transceiver; The processor, receiving a physical protocol data unit (PPDU) via the transceiver; The PPDU is constructed based on a duplicate transmission mode; The PPDU comprises: a universal signal (U-SIG) field for interpreting the PPDU; an extremely high throughput signal (EHT-SIG) field including a modulation and coding scheme (MCS) field and contiguous with the U-SIG field; A short training field (STF) following the EHT-SIG field; A long training field (LTF) that is continuous with the STF; and A data field is included that is contiguous with the LTF, the U-SIG field includes a type field having a type value associated with 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 duplicated on each 20 MHz subchannel within the 80 MHz PPDU; the data field includes a first 484-tone resource unit (RU) and a second 484-tone RU; the first 484-tone RU is duplicated to the second 484-tone RU; The STF is constructed based on the STF sequence already set for 80 MHz, The LTF is configured based on the LTF sequence already set for the 80 MHz; A receiving STA adapted to decode the PPDU based on the U-SIG field.

12. The PPDU is an extremely high throughput (EHT) PPDU, The type field has a length of 2 bits; The type field is a first value associated with the replica transmission mode; a second value associated with a downlink (DL) orthogonal frequency division multiple access (OFDMA) transmission; and The receiving STA of claim 11, having a third value associated with a non-OFDMA DL multi-user multiple input multiple output (MU-MIMO) transmission.

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