Method and apparatus for receiving PPDUs over broadband in a wireless LAN system

Abstract

A method and apparatus for receiving PPDUs is provided. [Solution] A receiving STA receives a PPDU from a transmitting STA via a wideband and decodes the PPDU. The PPDU includes a legacy preamble and first and second signal fields. The legacy preamble and the first and second signal fields are generated based on a first phase rotation value. The first phase rotation value is obtained based on a first preamble puncturing pattern in the wideband. When the wideband is a 320 MHz band, the first preamble puncturing pattern includes a pattern in which a 40 MHz or 80 MHz band is punctured in the wideband. The first phase rotation value is [1 -1 -1 -1 1 -1 -1 -1 -1 1 1 1 1 1 1 1].

Description

[Technical Field]

[0001] This specification relates to a technique for receiving PPDU over a wideband in a wireless LAN system, and more particularly to a method and apparatus for obtaining an optimized PAPR for L-STF or L-LTF using a phase rotation value that takes into account limited preamble puncturing. [Background technology]

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

[0003] This specification proposes technical features that can be utilized in a new communication standard. For example, the new communication standard is the recently discussed Extreme High Throughput (EHT) standard. The EHT standard can use newly proposed increased bandwidth, improved PHY layer protocol data unit (PPDU) structure, improved sequencing, and Hybrid Automatic Repeat Request (HARQ) technology. The EHT standard can be referred to as the IEEE 802.11be standard.

[0004] New WLAN standards will use an increased number of spatial streams, which requires improved signaling techniques within WLAN systems to properly utilize the increased number of spatial streams. Summary of the Invention [Problem to be solved by the invention]

[0005] This specification proposes a method and apparatus for receiving PPDUs over a wide band in a wireless LAN system. [Means for solving the problem]

[0006] An example of this specification proposes a method for receiving PPDUs over a wideband.

[0007] This embodiment is implemented in a network environment supporting a next-generation wireless LAN system (IEEE 802.11be or EHT wireless LAN system), which is an improved version of the 802.11ax system and can achieve backward compatibility with the 802.11ax system.

[0008] This embodiment proposes a method and apparatus for setting a phase rotation value to be applied to a legacy preamble for optimized PAPR in L-STF or L-LTF, taking into account limited preamble puncturing when transmitting a PPDU over a wideband (240 MHz or 320 MHz).

[0009] A receiving station (STA) receives a PPDU (Physical Protocol Data Unit) from a transmitting station via a broadband.

[0010] The receiving STA decodes the PPDU.

[0011] The PPDU includes a legacy preamble, first and second signal fields. The legacy preamble may include a Legacy-Short Training Field (L-STF) and a Legacy-Long Training Field (L-LTF). The first signal field is a Universal-Signal (U-SIG), and the second signal field is an Extremely High Throughput-Signal (EHT-SIG). The PPDU may further include an EHT-STF, an EHT-LTF, and a data field.

[0012] The legacy preamble, the first signal field, and the second signal field are generated based on a first phase rotation value, i.e., a phase rotation is applied from the legacy preamble to the EHT-SIG.

[0013] The first phase rotation value is obtained based on a first preamble puncturing pattern of the wideband. If the wideband is a 320 MHz or 160+160 MHz band, the first preamble puncturing pattern includes a pattern in which a 40 MHz or 80 MHz band is punctured in the wideband. The first phase rotation value is [1 -1 -1 -1 1 -1 -1 -1 -1 1 1 1 1 1 1]. [Effects of the Invention]

[0014] According to the embodiment proposed in this specification, by proposing a phase rotation value for wideband transmission in a limited preamble puncturing situation, a new effect is achieved in that the PAPR of L-STF and L-LTF can be reduced and PPDU transmission can be performed at high power, thereby increasing the transmission range of the PPDU and improving overall performance. [Brief explanation of the drawings]

[0015] [Figure 1]1 illustrates an example of a transmitting device and / or a receiving device of the present specification. [Figure 2] FIG. 1 is a conceptual diagram showing the structure of a wireless LAN (WLAN). [Figure 3] 1 is a diagram illustrating a typical link setup process. [Figure 4] 1 is a diagram showing an example of a PPDU used in the IEEE standard. [Figure 5] 1 is a diagram showing the arrangement of resource units (RUs) used on a 20 MHz band. [Figure 6] 1 is a diagram showing the arrangement of resource units (RUs) used on a 40 MHz band. [Figure 7] 1 is a diagram showing the arrangement of resource units (RUs) used on an 80 MHz band. [Figure 8] The structure of the HE-SIG-B field is shown below. [Figure 9] 1 shows an example in which multiple User STAs are assigned to the same RU via MU-MIMO technology. [Figure 10] The operation related to UL-MU is shown. [Figure 11] 1 shows an example of a trigger frame. [Figure 12] 1 shows an example of a common information field of a trigger frame. [Figure 13] An example of subfields included in the per user information field is shown below. [Figure 14] Explain the technical features of UORA technology. [Figure 15] Examples of channels used / supported / defined within the 2.4 GHz band are shown below. [Figure 16] An example of channels used / supported / defined within the 5GHz band is shown below. [Figure 17] Examples of channels used / supported / defined within the 6GHz band are shown below. [Figure 18]1 shows an example of a PPDU used in this specification. [Figure 19] 10 illustrates a variation of the transmitting device and / or receiving device of the present specification. [Figure 20] 10 shows an example of a PHY transmission procedure for an HE SU PPDU. [Figure 21] FIG. 21 shows an example of a block diagram of a transmitting device that generates each field of an HE PPDU. [Figure 22] FIG. 22 is a procedure flow diagram showing the operation of the transmitting device according to this embodiment. [Figure 23] FIG. 23 is a procedure flow diagram showing the operation of the receiving device according to this embodiment. [Figure 24] FIG. 24 is a flowchart showing a procedure for a transmitting STA to transmit a PPDU according to this embodiment. [Figure 25] FIG. 25 is a flowchart showing a procedure for a receiving STA to receive a PPDU according to this embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0016] As used herein, "A or B" can mean "only A," "only B," or "both A and B." Also, 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 "only A," "only B," "only C," or "any combination of A, B, and C."

[0017] 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 "only A," "only B," or "both A and B." For example, "A, B, C" can mean "A, B, or C."

[0018] As used herein, "at least one of A and B" can mean "only A," "only B," or "both A and B." Additionally, as used herein, the expressions "at least one of A or B" and "at least one of A and / or B" can be interpreted in the same way as "at least one of A and B."

[0019] Furthermore, in this specification, "at least one of A, B and C" can mean "only A," "only B," "only C," or "any combination of A, B and C." Furthermore, "at least one of A, B or C" or "at least one of A, B and / or C" can mean "at least one of A, B and C."

[0020] Furthermore, parentheses used in this specification may mean "for example." Specifically, when "control information (PDCCH)" is used, "PDCCH" is proposed as an example of "control information." Furthermore, "control information" in this specification is not limited to "PDCCH," and "PDDCH" is proposed as an example of "control information." Furthermore, when "control information (i.e., PDCCH)" is used, "PDCCH" is proposed as an example of "control information."

[0021] In this specification, technical features individually described in one drawing may be embodied individually or simultaneously.

[0022] The following examples of the present specification apply to various wireless communication systems. For example, the following examples of the present specification apply to wireless local area network (WLAN) systems. For example, the present specification applies to the IEEE 802.11a / g / n / ac standards and the IEEE 802.11ax standard. The present specification also applies to the newly proposed EHT standard or the IEEE 802.11be standard. The present specification also applies to new WLAN standards that are enhancements of the EHT standard or the IEEE 802.11be. The present specification also applies to mobile communication systems. For example, the present specification applies to mobile communication systems based on LTE (Long Term Evolution) and its evolutions, which are based on the 3GPP (3rd Generation Partnership Project) standard. The present specification also applies to a 5GNR (5G Radio Frequency) communication system based on the 3GPP standard.

[0023] In the following, in order to explain the technical features of this specification, the technical features to which this specification is applied will be explained.

[0024] FIG. 1 shows an example of a transmitting device and / or a receiving device of this specification.

[0025] The example of Figure 1 can implement various technical features described below. Figure 1 relates to at least one STA (station). For example, the STAs (110, 120) herein may be referred to by various names such as a mobile terminal, wireless device, wireless transmit / receive unit (WTRU), user equipment (UE), mobile station (MS), mobile subscriber unit, or simply user. The STAs (110, 120) herein may be referred to by various names such as a network, base station, Node-B, access point (AP), repeater, router, relay, etc. The STAs (110, 120) herein may be referred to by various names such as a receiving device, transmitting device, receiving STA, transmitting STA, receiving device, transmitting device, etc.

[0026] For example, the STAs (110, 120) can perform either an AP (Access Point) role or a non-AP role. 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.

[0027] The STAs (110, 120) of this specification can support various communication standards other than the IEEE 802.11 standard. For example, they can support communication standards related to the 3GPP standard (e.g., LTE, LTE-A, 5GNR standard). In addition, the STAs of this specification can be implemented in various devices such as mobile phones, vehicles, and personal computers. In addition, the STAs of this specification can support communication for various communication services such as voice calls, video calls, data communications, and self-driving and autonomous driving.

[0028] As used herein, the STAs (110, 120) may include a medium access control (MAC) and physical layer interface to the wireless medium as defined by the IEEE 802.11 standard.

[0029] The STAs (110, 120) will be described below based on FIG. 1(a).

[0030] The first STA 110 includes a processor 111, a memory 112, and a transceiver 113. The illustrated processor, memory, and transceiver may each be implemented as a separate chip, or at least two or more blocks / functions may be implemented on a single chip.

[0031] 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.).

[0032] For example, the first STA (110) can perform the intended operations of the AP. For example, the AP's processor (111) can receive signals via the transceiver (113), process the received signals, generate transmit signals, and perform control for signal transmission. The AP's memory (112) can store signals received via the transceiver (113) (i.e., received signals) and can store signals to be transmitted via the transceiver (i.e., transmit signals).

[0033] For example, the second STA (120) can perform the intended operations 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.).

[0034] 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 to be transmitted via the transceiver (i.e., transmitted signals).

[0035] For example, in the following specification, the operation of the device designated as AP is performed in the first STA (110) or the second STA (120). For example, if the first STA (110) is an AP, the operation of the device designated as AP is controlled by a processor (111) of the first STA (110), and related signals are transmitted or received via a transceiver (113) controlled by the processor (111) of the first STA (110). Control information related to the operation of the AP and transmitted / received signals of the AP are stored in a memory (112) of the first STA (110). If the second STA (110) is an AP, the operation of the device designated as AP is controlled by a processor (121) of the second STA (120), and related signals are transmitted or received via a transceiver (123) controlled by the processor (121) of the second STA (120). Control information related to the operation of the AP and transmitted / received signals of the AP are stored in a memory (122) of the second STA (110).

[0036] For example, in the following specification, the operation of a device designated as non-AP (or User-STA) is performed in 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 designated as non-AP is controlled by the processor (121) of the second STA (120), and related signals are transmitted or received via the transceiver (123) controlled by the processor (121) of the second STA (120). In addition, control information related to the operation of the non-AP and AP transmission / reception signals are 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 designated as non-AP is controlled by the processor (111) of the first STA (110), and related signals are transmitted or received via the transceiver (113) controlled by the processor (111) of the first STA (120). In addition, control information related to the operation of the non-AP and transmission / reception signals of the AP are stored in the memory (112) of the first STA (110).

[0037] In the following specification, devices referred to as a (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. refer to the STAs (110, 120) in Figure 1. For example, devices referred to as a (transmitting / receiving) STA, first STA, second STA, STA1, STA2, AP, first AP, second AP, AP1, AP2, (transmitting / receiving) terminal, (transmitting / receiving) device, (transmitting / receiving) apparatus, network, etc. without specific reference numerals also refer to the STAs (110, 120) in Figure 1. For example, in the following example, operations by various STAs to transmit and receive signals (e.g., PPPDUs) may be performed in transceivers (113, 123) in Figure 1. Also, in the following example, operations in which various STAs generate transmission / reception signals or perform data processing or calculations in advance for transmission / reception signals may be executed by the processors (111, 121) in Fig. 1. For example, examples of operations in which various STAs generate transmission / reception signals or perform data processing or calculations in advance for transmission / reception signals may include: 1) operations of determining / acquiring / configuring / calculating / decoding / encoding bit information of subfields (SIG, STF, LTF, Data) included in a PPDU, 2) operations of determining / configuring / acquiring time resources and frequency resources (e.g., subcarrier resources) used for the subfields (SIG, STF, LTF, Data) included in a PPDU, 3) operations of determining / configuring / acquiring specific sequences (e.g., pilot sequences, STF / LTF sequences, extra sequences applied to SIG) used for the subfields (SIG, STF, LTF, Data) included in a PPDU, 4) power control operations and / or power saving operations applied to the STAs, and 5) operations related to determining / acquiring / configuring / calculating / decoding / encoding an ACK signal.Also, in the following example, various information (e.g., information related to fields / subfields / control fields / parameters / power, etc.) used by various STAs to determine / acquire / configure / calculate / decode / encode transmitted / received signals is stored in memories (112, 122) of FIG. 1.

[0038] The device / STA of Fig. 1(a) described above is modified as shown in Fig. 1(b). The STAs (110, 120) of this specification will be described based on Fig. 1(b) below.

[0039] For example, the transceivers (113, 123) shown in FIG. 1(b) may perform the same functions as the transceivers shown in FIG. 1(a) described above. For example, the processing chips (114, 124) shown in FIG. 1(b) may include processors (111, 121) and memories (112, 122). The processors (111, 121) and memories (112, 122) shown in FIG. 1(b) may perform the same functions as the processors (111, 121) and memories (112, 122) shown in FIG. 1(a) described above.

[0040] In the following description, the terms mobile terminal, wireless device, wireless transmit / receive unit (WTRU), user equipment (UE), mobile station (MS), mobile subscriber unit, user, user STA, network, base station, Node-B, access point (AP), repeater, router, relay, receiving device, transmitting device, receiving STA, transmitting STA, receiving device, transmitting device, receiving apparatus, and / or transmitting apparatus refer to the STAs (110, 120) shown in FIG. 1(a) / (b) or the processing chips (114, 124) shown in FIG. 1(b). In other words, the technical features of this specification may be performed by the STAs (110, 120) shown in FIG. 1(a) / (b), or may be performed only by the processing chips (114, 124) shown in FIG. 1(b). For example, the technical feature of the transmitting STA transmitting a control signal can be understood as the technical feature of the control signal generated in the processor (111, 121) shown in Figure 1(a) / (b) being transmitted via the transceiver (113, 123) shown in Figure 1(a) / (b). Alternatively, the technical feature of the transmitting STA transmitting a control signal can be understood as the technical feature of the control signal being generated in the processing chip (114, 124) shown in Figure 1(b) and transmitted to the transceiver (113, 123).

[0041] 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 transceiver (113, 123) shown in Fig. 1(a). Alternatively, 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 transceiver (113, 123) shown in Fig. 1(a) being acquired by the processor (111, 121) shown in Fig. 1(a). Alternatively, 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 transceiver (113, 123) shown in Fig. 1(b) being acquired by the processing chip (114, 124) shown in Fig. 1(b).

[0042] Referring to Figure 1(b), software code (115, 125) is contained within memory (112, 122). The software code (115, 125) contains instructions that control the operation of the processor (111, 121). The software code (115, 125) may be contained in a variety of programming languages.

[0043] The processors (111, 121) or processing chips (114, 124) shown in FIG. 1 may include an application-specific integrated circuit (ASIC), other chipsets, logic circuits, and / or data processing devices. The processors are application processors (APs). For example, the processors (111, 121) or processing chips (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.

[0044] In this specification, an uplink refers to a link for communication from a non-AP STA to an AP STA, and uplink PPDUs / packets / signals, etc. are transmitted via the uplink. Also, in this specification, a downlink refers to a link for communication from an AP STA to a non-AP STA, and downlink PPDUs / packets / signals, etc. are transmitted via the downlink.

[0045] FIG. 2 is a conceptual diagram showing the structure of a wireless LAN (WLAN).

[0046] The top part of Figure 2 shows the structure of an IEEE (Institute of Electrical and Electronic Engineers) 802.11 infrastructure BSS (basic service set).

[0047] Referring to the top of Figure 2, a wireless LAN system can include one or more infrastructure BSSs (200, 205) (hereinafter referred to as BSS). A BSS (200, 205) is a set of APs and STAs, such as an access point (AP, 225) and a station (STA1, 200-1), that can properly synchronize and communicate with each other, and does not refer to a specific area. A BSS (205) can include one AP (230) and one or more STAs (205-1, 205-2) that can join the BSS.

[0048] The BSS can include at least one STA, APs (225, 230) that provide a distribution service, and a distribution system (DS, 210) that connects multiple APs.

[0049] The distribution system (210) can implement an extended service set (ESS, 240) by connecting multiple BSSs (200, 205). The term ESS (240) is used to refer to a network formed by connecting one or more APs via the distribution system (210). APs included in one ESS (240) have the same service set identification (SSID).

[0050] The portal (portal 220) can act as a bridge that connects a wireless LAN network (IEEE 802.11) to other networks (e.g., 802.X).

[0051] In the BSS shown at the top of Figure 2, a network between APs (225, 230) and a network between APs (225, 230) and STAs (200-1, 205-1, 205-2) are implemented. However, it is also possible to set up a network between STAs without APs (225, 230) and communicate between them. A network that sets up a network between STAs without APs (225, 230) and communicates between them is defined as an ad-hoc network or independent basic service set (IBSS).

[0052] The bottom part of Figure 2 is a conceptual diagram showing the IBSS.

[0053] Referring to the bottom of Figure 2, an IBSS is a BSS that operates in ad-hoc mode. Since an IBSS does not include an AP, there is no centralized management entity that performs management functions. That is, in an IBSS, STAs (250-1, 250-2, 250-3, 255-4, 255-5) are managed in a distributed manner. In an IBSS, all STAs (250-1, 250-2, 250-3, 255-4, 255-5) are mobile STAs, and are not allowed to connect to a distribution system, forming a self-contained network.

[0054] FIG. 3 is a diagram illustrating a typical link setup process.

[0055] In step S310, the STA can perform a network discovery operation. The network discovery operation can include the STA's scanning operation. In other words, the STA needs to find a joinable network in order to access the network. Before joining a wireless network, the STA needs to identify a compatible network. The process of identifying networks present in a specific area is called scanning. There are two scanning methods: active scanning and passive scanning.

[0056] FIG. 3 illustrates an example of a network discovery process that includes an active scanning process. In active scanning, a scanning STA moves between channels, transmits a probe request frame to search for nearby APs, and waits for a response. The responder transmits a probe response frame to the STA that transmitted the probe request frame in response to the probe request frame. Here, the responder is the STA that last transmitted a beacon frame in the BSS of the channel being scanned. In a BSS, the AP transmits the beacon frame, so the responder is the AP. In an IBSS, the responder is not fixed because STAs within the IBSS return and transmit beacon frames. For example, a STA that transmits a probe request frame on channel 1 and receives a probe response frame on channel 1 can store BSS-related information included in the received probe response frame, move to the next channel (e.g., channel 2), and perform scanning in the same manner (i.e., transmit and receive probe request / response on channel 2).

[0057] Although not shown as an example in FIG. 3, scanning operations may also be performed using a passive scanning method. STAs performing scanning based on passive scanning can move between channels and wait for beacon frames. Beacon frames are a type of management frame in IEEE 802.11 that are periodically transmitted to notify the existence of a wireless network and allow scanning STAs to find and join the wireless network. In a BSS, the AP periodically transmits beacon frames, and in an IBSS, STAs within the IBSS return and transmit beacon frames. When a scanning STA receives a beacon frame, it stores information about the BSS contained in the beacon frame and records beacon frame information on each channel as it moves to other channels. A STA that receives a beacon frame stores BSS-related information contained in the received beacon frame, moves to the next channel, and performs scanning on the next channel in the same manner.

[0058] An STA that has discovered a network can perform an authentication process through step S320. This authentication process is called the first authentication process to clearly distinguish it from the security setup operation in step S340, which will be described later. The authentication process in S320 may include a process in which the STA transmits an authentication request frame to the AP, and in response, the AP transmits an authentication response frame to the STA. The authentication frame used for the authentication request / response corresponds to a management frame.

[0059] The authentication frame can include information on the authentication algorithm number, authentication transaction sequence number, status code, challenge text, RSN (Robust Security Network), Finite Cyclic Group, etc.

[0060] The STA can send an authentication request frame to the AP. The AP can determine whether to allow authentication for the STA based on the information contained in the received authentication request frame. The AP can provide the STA with the result of the authentication process via an authentication response frame.

[0061] A successfully authenticated STA can perform an association process according to step S330. The association process includes the STA transmitting an association request frame to the AP, and the AP transmitting an association response frame to the STA in response. For example, the association request frame may include various capability-related information, such as a beacon listen interval, a service set identifier (SSID), supported rates, supported channels, an RSN, a mobility domain, supported operating classes, a Traffic Indication Map Broadcast request, and information regarding interworking service capabilities. For example, the connection response frame may include information related to various capabilities, a status code, an association ID (AID), supported rates, an Enhanced Distributed Channel Access (EDCA) parameter set, a received channel power indicator (RCPI), a received signal to noise indicator (RSNI), a mobility domain, a timeout interval (association comeback time), overlapping BSS scan parameters, a TIM broadcast response, a QoS map, and other information.

[0062] Thereafter, the STA may perform a security setup process in step S340. The security setup process in step S340 may include, for example, a private key setup process via a four-way handshake using an Extesible Authentication Protocol over LAN (EAPOL) frame.

[0063] FIG. 4 is a diagram showing an example of a PPDU used in the IEEE standard.

[0064] As shown, various types of PPDUs (PHY protocol data units) are used in standards such as IEEEa / g / n / ac. Specifically, the LTF and STF fields contain training signals, SIG-A and SIG-B contain control information for the receiving station, and the data field contains user data corresponding to the PSDU (MAC PDU / Aggregated MAC PDU).

[0065] 4 also includes an example of an HE PPDU of the IEEE 802.11ax standard. The HE PPDU shown in FIG. 4 is an example of a PPDU for multiple users, and the HE-SIG-B is included only for multiple users, and the corresponding HE-SIG-B is omitted for a PPDU for a single user.

[0066] As shown, an HE-PPDU for multiple users (MUs) can 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 is transmitted during the indicated time interval (e.g., 4 or 8 μs, etc.).

[0067] The resource unit (RU) used in the PPDU is described below. A resource unit can include multiple subcarriers (or tones). A resource unit is used when transmitting signals to multiple STAs based on OFDMA technology. A resource unit is also defined when transmitting a signal to a single STA. A resource unit is used for the STF, LTF, data field, etc.

[0068] FIG. 5 is a diagram showing the allocation of resource units (RUs) used on a 20 MHz band.

[0069] As shown in Figure 5, some fields of the HE-PPDU may be configured using resource units (RUs) corresponding to different numbers of tones (i.e., subcarriers). For example, resources are allocated in the indicated RU units to the HE-STF, HE-LTF, and data fields.

[0070] As shown at the top of Figure 5, 26 units (i.e., units corresponding to 26 tones) are allocated. Six tones are used as a guard band in the leftmost band of the 20 MHz band, and five tones are used as a guard band in the rightmost band of the 20 MHz band. Seven DC tones are inserted in the center band, i.e., the DC band, and there may be 26 units corresponding to 13 tones on each side of the DC band. 26 units, 52 units, and 106 units are allocated to other bands. Each unit is allocated for a receiving station, i.e., a user.

[0071] On the other hand, the RU arrangement of Figure 5 can be utilized not only in a multiple user (MU) situation but also in a single user (SU) situation, in which case one 242 unit can be used as shown at the bottom of Figure 5, and in this case three DC tones are inserted.

[0072] In the example of Figure 5, various sizes of RUs are proposed, i.e., 26RU, 52RU, 106RU, 242RU, etc., and the specific sizes of such RUs may be expanded or increased, so this embodiment is not limited to the specific size of each RU (i.e., the number of corresponding tones).

[0073] FIG. 6 is a diagram showing the allocation of resource units (RUs) used on the 40 MHz band.

[0074] Just as various sizes of RUs are used in the example of Figure 5, the example of Figure 6 also uses 26RU, 52RU, 106RU, 242RU, 484RU, etc. Also, five DC tones are inserted at the center frequency, 12 tones are used as a guard band in the leftmost band of the 40 MHz band, and 11 tones are used as a guard band in the rightmost band of the 40 MHz band.

[0075] Also, as shown, when used for a single user, 484 RUs can be used, while the specific number of RUs can be changed, as in the example of FIG.

[0076] FIG. 7 is a diagram showing the allocation of resource units (RUs) used on the 80 MHz band.

[0077] Just as various sizes of RUs are used in the examples of Figures 5 and 6, the example of Figure 7 can also use 26RU, 52RU, 106RU, 242RU, 484RU, 996RU, etc. In addition, seven DC tones are inserted at the center frequency, 12 tones are used as a guard band in the leftmost band of the 80 MHz band, and 11 tones are used as a guard band in the rightmost band of the 80 MHz band. In addition, 26RUs using 13 tones on each side of the DC band can be used.

[0078] Also, as shown, 996 RUs are available when used for a single user, in which case five DC tones are inserted.

[0079] The RUs described herein are 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 via 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 interval.

[0080] For example, when a DL MU PPDU is configured, the transmitting STA (e.g., AP) can assign a first RU (e.g., 26 / 52 / 106 / 242 RU, etc.) to the first STA and a second RU (e.g., 26 / 52 / 106 / 242 RU, etc.) to the second STA. That is, the transmitting STA (e.g., AP) can transmit the HE-STF, HE-LTF, and Data fields for the first STA via the first RU and the HE-STF, HE-LTF, and Data fields for the second STA via the second RU within one MU PPDU.

[0081] Information about the location of the RU is signaled via HE-SIG-B.

[0082] Figure 8 shows the structure of the HE-SIG-B field.

[0083] As shown, the HE-SIG-B field 810 includes a common field 820 and a user-specific field 830. The common field 820 can contain information that applies to all users (i.e., user STAs) receiving the SIG-B. The user-specific field 830 can be called a user-specific control field. When the SIG-B is transmitted to multiple users, the user-specific field 830 can apply to only some of the users.

[0084] As shown in FIG. 8, the common field (820) and the user specific field (830) can be encoded separately.

[0085] The common field 820 can contain N*8 bits of RU allocation information. For example, the RU allocation information can contain information about the location of the RU. For example, when a 20 MHz channel is used as shown in FIG. 5, the RU allocation information can contain information about which RU (26RU / 52RU / 106RU) is allocated to which frequency band.

[0086] An example of RU allocation information consisting of 8 bits is as follows:

[0087] [Table 1]

[0088] As shown in the example of Figure 5, a maximum of nine 26RUs are allocated to a 20MHz channel. When the RU allocation information in the common field (820) is set to "00000000," as shown in Table 1, nine 26RUs are allocated to the corresponding channel (i.e., 20MHz). Also, when the RU allocation information in the common field (820) is set to "00000001," as shown in Table 1, seven 26RUs and one 52RU are allocated to the corresponding channel. That is, in the example of Figure 5, 52RUs are allocated to the far right, and seven 26RUs are allocated to the left of that.

[0089] The example in Table 1 shows only a portion of the RU locations for which RU allocation information can be displayed.

[0090] For example, the RU allocation information may further include an example of Table 2 below.

[0091] [Table 2]

[0092] "01000y2y1y0" relates to an example in which 106RU is allocated to the left end of a 20MHz channel, and five 26RUs are allocated to the right of it. In this case, a large number of STAs (e.g., User-STAs) are allocated to the 106RU based on MU-MIMO technology. Specifically, a maximum of eight STAs (e.g., User-STAs) are allocated to the 106RU, and the number of STAs (e.g., User-STAs) allocated to the 106RU is determined based on the 3-bit information (y2y1y0). For example, if the 3-bit information (y2y1y0) is set to N, the number of STAs (e.g., User-STAs) allocated to the 106RU based on MU-MIMO technology is N+1.

[0093] Typically, multiple STAs (e.g., User STAs) are assigned to multiple RUs. However, multiple STAs (e.g., User STAs) are assigned to an RU of a certain size (e.g., 106 subcarriers) or more based on MU-MIMO technology.

[0094] As shown in Figure 8, the user-specific field (830) can include multiple user fields. As described above, the number of STAs (e.g., user STAs) allocated to a specific channel is determined based on the RU allocation information in the common field (820). For example, if the RU allocation information in the common field (820) is '00000000', one user STA is allocated to each of the nine 26 RUs (i.e., a total of nine user STAs are allocated). In other words, up to nine user STAs are allocated to a specific channel via OFDMA technology. Also, up to nine user STAs are allocated to a specific channel via non-MU-MIMO technology.

[0095] For example, if the RU allocation is set to "01000y2y1y0", multiple user STAs are allocated to the 106RU located on the left side using MU-MIMO technology, and five user STAs are allocated to the five 26RUs located to the right using non-MU-MIMO technology. This case is embodied by the example shown in Figure 9.

[0096] FIG. 9 shows an example in which multiple user STAs are assigned to the same RU via MU-MIMO technology.

[0097] For example, when RU allocation is set to "01000010" as shown in Figure 9, 106 RUs are allocated to the left end of a specific channel, and five 26 RUs are allocated to the right of that, based on Table 2. In addition, a total of three user STAs are allocated to the 106 RUs via MU-MIMO technology. As a result, a total of eight user STAs are allocated, and therefore the user individual field (830) of HE-SIG-B can include eight user fields.

[0098] The eight user fields are included in the order shown in Figure 9. Also, as shown in Figure 8, two user fields are implemented in one user block field.

[0099] The user fields shown in Figures 8 and 9 are configured based on two formats. That is, the user field related to MU-MIMO technology is configured in a first format, and the user field related to non-MU-MIMO technology is configured in a second format. Referring to the example of Figure 9, user fields 1 to 3 are based on the first format, and user fields 4 to 8 are based on the second format. The first format or the second format can contain bit information of the same length (e.g., 21 bits).

[0100] Each user field can have the same size (for example, 21 bits). For example, the user field of the first format (the format of the MU-MIMO technology) is configured as follows:

[0101] For example, the first bit (e.g., B0-B10) in the User field (i.e., 21 bits) may contain identification information (e.g., STA-ID, partial AID, etc.) of the User STA to which the corresponding User field is assigned. Also, the second bit (e.g., B11-B14) in the User field (i.e., 21 bits) may contain information regarding spatial configuration. Specifically, an example of the second bit (i.e., B11-B14) may be the same as Tables 3 to 4 below.

[0102] [Table 3]

[0103] [Table 4]

[0104] 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 multiple user STAs allocated according to the MU-MIMO technology. For example, when three user STAs are allocated to 106RU based on the MU-MIMO technology as shown in FIG. 9, N_user is set to '3', and the values ​​of N_STS[1], N_STS[2], and N_STS[3] are determined accordingly, 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 are set. That is, in the example of FIG. 9, four spatial streams are allocated to user field 1, one spatial stream is allocated to user field 2, and one spatial stream is allocated to user field 3.

[0105] As shown in the examples of Table 3 and / or Table 4, information regarding the number of spatial streams for a user station (User STA) (i.e., the second bits, B11-B14) is composed of 4 bits. Also, the information regarding the number of spatial streams for a user station (User STA) (i.e., the second bits, B11-B14) can support up to 8 spatial streams. Also, the information regarding the number of spatial streams (i.e., the second bits, B11-B14) can support up to 4 spatial streams for one user STA.

[0106] In addition, the third bit (i.e., B15-18) in the User field (i.e., 21 bits) can contain MCS (Modulation and coding scheme) information, which is applied to the data field in the PPDU containing the corresponding SIG-B.

[0107] As used herein, MCS, MCS information, MCS index, MCS field, etc. may be represented as a specific index value. For example, MCS information may be represented as index 0 to index 11. MCS information may include information about a constellation modulation type (e.g., BPSK, QPSK, 16_QAM, 64_QAM, 256_QAM, 1024_QAM, etc.) and information about a code rate (e.g., 1 / 2, 2 / 3, 3 / 4, 5 / 6, etc.). MCS information may exclude information about a channel coding type (e.g., BSS or LDPC).

[0108] Also, the fourth bit (ie, B19) in the User field (ie, 21 bits) is a Reserved field.

[0109] In addition, the fifth bit (i.e., B20) in the User field (i.e., 21 bits) may contain information about the coding type (e.g., BSS or LDPC). That is, the fifth bit (i.e., B20) may contain information about the type of channel coding (e.g., BSS or LDPC) applied to the data field in the PPDU containing the corresponding SIG-B.

[0110] The above example relates to the User field of the first format (the format for MU-MIMO technology). An example of the User field of the second format (the format for non-MU-MIMO technology) is as follows:

[0111] 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 modulation and coding scheme (MCS) information. The fifth bit (e.g., B19) in the User field of the second format may include information regarding whether dual carrier modulation (DCM) is applied. The sixth bit (i.e., B20) in the User field of the second format may include information regarding the coding type (e.g., BSS or LDPC).

[0112] 10 shows the operation of a UL-MU. As shown, a transmitting STA (e.g., AP) can perform channel access via contending (i.e., backoff operation) and transmit a trigger frame (1030). That is, the transmitting STA (e.g., AP) can transmit a PPDU including a trigger frame (1330). When a PPDU including a trigger frame is received, a trigger-based (TB) PPDU is transmitted after a delay of SIFS.

[0113] The TB PPDUs (1041, 1042) are transmitted in the same time period from multiple STAs (e.g., User STAs) whose AIDs are indicated in the Trigger frame (1030). The ACK frame (1050) for the TB PPDU can be implemented in various forms.

[0114] Specific features of the trigger frame will be described with reference to Figures 11 to 13. When UL-MU communication is used, orthogonal frequency division multiple access (OFDMA) technology or MU MIMO technology is used, or OFDMA and MU MIMO technology are used simultaneously.

[0115] An example of a trigger frame is shown in Figure 11. The trigger frame in Figure 11 allocates resources for uplink MU transmission (Uplink Multiple-User transmission) and is transmitted, for example, from an AP. The trigger frame is composed of a MAC frame and is included in a PPDU.

[0116] Some of the fields shown in Figure 11 may be omitted, others may be added, and the length of each field may vary from that shown.

[0117] The frame control field (1110) in Figure 11 contains information about the MAC protocol version and other additional control information, and the duration field (1120) contains information about the time information for NAV setting and the STA identifier (e.g., AID).

[0118] In addition, the RA field (1130) contains address information of the STA receiving the corresponding trigger frame, and may be omitted if necessary. The TA field (1140) contains address information of the STA (e.g., AP) transmitting the corresponding trigger frame, and the common information field (1150) contains common control information applied to the receiving STA receiving the corresponding trigger frame. For example, it includes a field indicating the length of the L-SIG field of the up PPDU transmitted corresponding to the corresponding trigger frame, and information controlling the contents of the SIG-A field (i.e., the HE-SIG-A field) of the up PPDU transmitted corresponding to the corresponding trigger frame. In addition, the common control information includes information regarding the length of the CP of the up PPDU transmitted corresponding to the corresponding trigger frame and information regarding the length of the LTF field.

[0119] It is also preferable to include per user information fields (1160#1 to 1160#N) corresponding to the number of receiving STAs that receive the trigger frame of Figure 11. The per user information fields are also called "assignment fields."

[0120] The trigger frame of FIG. 11 may also include a padding field (1170) and a frame check sequence field (1180).

[0121] Each of the per user information fields (1160#1 to 1160#N) shown in FIG. 11 can again include multiple subfields.

[0122] Figure 12 shows an example of the common information field of a trigger frame. Some of the subfields in Figure 12 may be omitted, and other subfields may be added. Also, the length of each of the subfields shown may vary.

[0123] The indicated length field (1210) has the same value as the length field of the L-SIG field of the uplink PPDU transmitted corresponding to the trigger frame, and the length field of the L-SIG field of the uplink PPDU indicates the length of the uplink PPDU. As a result, the length field (1210) of the trigger frame is used to indicate the length of the corresponding uplink PPDU.

[0124] In addition, the cascade indicator field (1220) indicates whether a cascade operation is performed. Cascade operation means that both downlink MU transmission and uplink MU transmission are performed within the same TXOP. In other words, it means that after a downlink MU transmission is performed, uplink MU transmission is performed after a pre-set time (e.g., SIFS). In cascade operation, there may be only one transmitter (e.g., AP) performing downlink communication, and multiple transmitters (e.g., non-APs) performing uplink communication.

[0125] The CS request field (1230) indicates whether or not the receiving device that received the trigger frame needs to consider the state of the wireless medium, NAV, etc. when transmitting the corresponding uplink PPDU.

[0126] The HE-SIG-A information field (1240) contains information that controls the content of the SIG-A field (i.e., the HE-SIG-A field) of the up PPDU transmitted in response to the corresponding trigger frame.

[0127] The CP and LTF type field (1250) can include information about the LTF length and CP length of the up PPDU transmitted corresponding to the trigger frame. The trigger type field (1060) can indicate the purpose for which the trigger frame is used, such as a normal trigger, a trigger for beamforming, or a request for Block ACK / NACK.

[0128] In this specification, it can be assumed that the trigger type field (1260) of the trigger frame indicates a basic type trigger frame for a normal trigger. For example, a basic type trigger frame can be called a basic trigger frame.

[0129] Figure 13 shows an example of subfields included in a per user information field. The user information field (1300) of Figure 13 can be understood as any one of the individual user information fields (1160#1 to 1160#N) mentioned in Figure 11. Some of the subfields included in the user information field (1300) of Figure 13 may be omitted, and other subfields may be added. Also, the length of each of the subfields shown may vary.

[0130] The User Identifier field (1310) in FIG. 13 indicates the identifier of the STA (i.e., the receiving STA) corresponding to the individual user information, and an example of the identifier can be all or part of the AID (Association Identifier) ​​value of the receiving STA.

[0131] Also included is an RU allocation field 1320. That is, when a receiving STA identified in the user identifier field 1310 transmits a TB PPDU corresponding to the trigger frame, the TB PPDU is transmitted via the RU indicated by the RU allocation field 1320. In this case, the RU indicated by the RU allocation field 1320 is the RU shown in Figures 5, 6, and 7.

[0132] The subfields of Figure 13 may include a coding type field 1330. The coding type field 1330 may indicate the coding type of the TB PPDU. For example, if BCC coding is applied to the TB PPDU, the coding type field 1330 is set to '1', and if LDPC coding is applied, the coding type field 1330 is set to '0'.

[0133] 13 may also include an MCS field 1340. The MCS field 1340 may indicate the MCS technique applied to the TB PPDU. For example, if BCC coding is applied to the TB PPDU, the coding type field 1330 is set to '1', and if LDPC coding is applied, the coding type field 1330 is set to '0'.

[0134] The UL OFDMA-based Random Access (UORA) technology will be described below.

[0135] Figure 14 illustrates the technical features of the UORA technology.

[0136] A transmitting STA (e.g., AP) can allocate six RU resources via a trigger frame as shown in Figure 14. Specifically, the AP can allocate the first RU resource (AID 0, RU1), the second RU resource (AID 0, RU2), the third RU resource (AID 0, RU3), the fourth RU resource (AID 2045, RU4), the fifth RU resource (AID 2045, RU5), and the sixth RU resource (AID 3, RU6). Information about AID 0, AID 3, or AID 2045 is included, for example, in the user identification field (1310) in Figure 13. Information about RU 1 to RU 6 is included, for example, in the RU allocation field (1320) in Figure 13. AID = 0 indicates a UORA resource for an associated STA, and AID = 2045 indicates a UORA resource for an unassociated STA. As a result, the first to third RU resources in Figure 14 are used as UORA resources for associated STAs, the fourth to fifth RU resources in Figure 14 are used as UORA resources for unassociated STAs, and the sixth RU resource in Figure 14 is used as a resource for a normal ULMU.

[0137] In the example shown in Figure 14, the OFDMA random access backoff (OBO) counter of STA1 is decremented to 0, and STA1 randomly selects the second RU resource (AID 0, RU2). Since the OBO counters of STA2 / 3 are greater than 0, no uplink resources are allocated to STA2 / 3. Also, in Figure 14, STA4 includes its own AID (i.e., AID=3) in the trigger frame, so RU6 resource is allocated without backoff.

[0138] Specifically, since STA1 in FIG. 14 is an associated STA, there are a total of three eligible RA RUs for STA1 (RU1, RU2, RU3), and as a result, STA1 has decremented its OBO counter by 3, resulting in the OBO counter being set to 0. Also, since STA2 in FIG. 14 is an associated STA, there are a total of three eligible RA RUs for STA2 (RU1, RU2, RU3), and as a result, STA2 has decremented its OBO counter by 3, but the OBO counter is still greater than 0. Also, since STA3 in FIG. 14 is an unassociated STA, there are a total of two eligible RA RUs for STA3 (RU4, RU5), and as a result, STA3 has decremented its OBO counter by 2, but the OBO counter is still greater than 0.

[0139] Figure 15 shows an example of channels used / supported / defined within the 2.4 GHz band.

[0140] The 2.4 GHz band may be referred to by other names, such as Band 1. The 2.4 GHz band also refers to the frequency range in which channels with center frequencies adjacent to 2.4 GHz (e.g., channels with center frequencies between 2.4 and 2.5 GHz) are used / supported / defined.

[0141] The 2.4 GHz band contains multiple 20 MHz channels. The 20 MHz in the 2.4 GHz band can have multiple channel indices (e.g., index 1 through index 14). For example, the center frequency of a 20 MHz channel assigned channel index 1 is 2.412 GHz, the center frequency of a 20 MHz channel assigned channel index 2 is 2.417 GHz, and the center frequency of a 20 MHz channel assigned channel index N is (2.407 + 0.005 * N) GHz. Channel indices are referred to by various names, such as channel numbers. The specific values ​​of channel indices and center frequencies are subject to change.

[0142] FIG. 15 shows an example of four channels in the 2.4 GHz band. The first to fourth frequency regions (1510, 1540) shown can each include one channel. For example, the first frequency region (1510) can include channel 1 (a 20 MHz channel with index 1). In this case, the center frequency of channel 1 is set to 2412 MHz. The second frequency region (1520) can include channel 6. In this case, the center frequency of channel 6 is set to 2437 MHz. The third frequency region (1530) can include channel 11. In this case, the center frequency of channel 11 is set to 2462 MHz. The fourth frequency region (1540) can include channel 14. In this case, the center frequency of channel 14 is set to 2484 MHz.

[0143] Figure 16 shows an example of channels used / supported / defined within the 5 GHz band.

[0144] The 5 GHz band may be referred to by other names such as the second band or band. The 5 GHz band refers to a frequency range in which channels with center frequencies greater than or equal to 5 GHz and less than 6 GHz (or less than 5.9 GHz) are used / supported / defined. Alternatively, the 5 GHz band may include multiple channels between 4.5 GHz and 5.5 GHz. The specific values ​​shown in Figure 16 are subject to change.

[0145] The multiple channels within the 5 GHz band include UNII (Unlicensed National Information Infrastructure)-1, UNII-2, UNII-3, and ISM. UNII-1 can be called UNII Low. UNII-2 can include frequency regions called UNII Mid and UNII-2 Extended. UNII-3 can be called UNII Upper.

[0146] Within the 5 GHz band, multiple channels are configured, with each channel having a bandwidth of various sizes, such as 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 can be divided into eight 20 MHz channels. Within 5170 MHz, the 5330 MHz frequency region / range can be divided into four channels with a 40 MHz frequency region. Within 5170 MHz, the 5330 MHz frequency region / range can be divided into two channels with an 80 MHz frequency region. Alternatively, within 5170 MHz, the 5330 MHz frequency region / range can be divided into one channel with a 160 MHz frequency region.

[0147] Figure 17 shows an example of channels used / supported / defined within the 6 GHz band.

[0148] The 6 GHz band may be referred to by other names such as the third band or band. The 6 GHz band refers to the frequency range in which channels with center frequencies of 5.9 GHz or higher are used / supported / defined. The specific values ​​shown in Figure 17 are subject to change.

[0149] For example, the 20 MHz channels in Figure 17 are defined starting from 5.940 GHz. Specifically, the leftmost channel of the 20 MHz channels in Figure 17 may have an index (or channel index, channel number, etc.) of 1, and is assigned a center frequency of 5.945 GHz. That is, the center frequency of channel index N is determined to be (5.940 + 0.005 * N) GHz.

[0150] As a result, the indices (or channel numbers) of the 20 MHz channels in Figure 17 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, according to the above-mentioned (5.940+0.005*N) GHz rule, the indices of the 40 MHz channels in Figure 17 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.

[0151] The example in FIG. 17 shows 20, 40, 80, and 160 MHz channels, but 240 MHz and 320 MHz channels are also added.

[0152] The PPDUs transmitted / received in the STAs of this specification are described below.

[0153] FIG. 18 shows an example of a PPDU used in this specification.

[0154] 18 is 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 is referred to by various names such as transmit PPDU, receive PPDU, first type or Nth type PPDU, etc. Furthermore, EHT PPDU is used in EHT systems and / or new wireless LAN systems that are improvements to the EHT system.

[0155] The PPDU in Figure 18 may represent some or all of the PPDU types used in the EHT system. For example, the example in Figure 18 is used for both the single-user (SU) mode and the multi-user (MU) mode. Also, the PPDU in Figure 18 is a PPDU for one receiving STA or multiple receiving STAs. When the PPDU in Figure 18 is used for the trigger-based (TB) mode, the EHT-SIG in Figure 18 is omitted. Also, a STA that receives a trigger frame for uplink-MU (UL-MU) communication can transmit a PPDU in the example in Figure 18 from which the EHT-SIG is omitted.

[0156] In FIG. 18, L-STF to EHT-LTF are called preambles or physical preambles, and are generated / transmitted / received / acquired / decoded in the physical layer.

[0157] The subcarrier spacing of the L-STF, L-LTF, L-SIG, RL-SIG, U-SIG, and EHT-SIG fields in Figure 18 is determined to be 312.5 kHz, and the subcarrier spacing of the EHT-STF, EHT-LTF, and Data fields is 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 can be expressed in units of 312.5 kHz, and the tone index (or subcarrier index) of the EHT-STF, EHT-LTF, and Data fields can be expressed in units of 78.125 kHz.

[0158] In the PPDU of FIG. 18, the L-LTF and L-STF are the same as the conventional fields.

[0159] The L-SIG field in FIG. 18 may contain, 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 Tail bits. For example, the 12-bit Length field may contain information about the length or time duration of the PPDU. For example, the value of the 12-bit Length field is determined based on the type of PPDU. For example, if the PPDU is a non-HT, HT, VHT PPDU, or EHT PPDU, the value of the Length field may be determined as a multiple of 3. For example, if the PPDU is an HE PPDU, the value of the Length field may be determined as "multiple of 3 + 1" or "multiple of 3 + 2." Furthermore, for non-HT, HT, VHT PPDU, or EHT PPDU, the value of the Length field is determined as a multiple of 3, and for HE PPDU, the value of the Length field is determined as "multiple of 3 + 1" or "multiple of 3 + 2."

[0160] For example, the transmitting STA can apply BCC encoding based on a code rate of 1 / 2 to the 24-bit information in the L-SIG field. The transmitting STA can then obtain 48 BCC-coded bits. BPSK modulation is applied to the 48 coded bits to generate 48 BPSK symbols. The transmitting STA can map the 48 BPSK symbols to positions excluding the pilot subcarriers (subcarrier indexes -21, -7, +7, +21) and the DC subcarrier (subcarrier index 0). As a result, the 48 BPSK symbols are 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 can further map signals of {-1, -1, -1, 1} to subcarrier indexes {-28, -27, +27, 28}. The above signal is used for channel estimation for the frequency domain corresponding to {-28, -27, +27, 28}.

[0161] The transmitting STA can generate an RL-SIG, which is generated similarly to the L-SIG. BPSK modulation is applied to the RL-SIG. The receiving STA can determine whether the received PPDU is an HE PPDU or an EHT PPDU based on the presence of the RL-SIG.

[0162] A Universal SIG (U-SIG) is inserted after the RL-SIG in Figure 18. The U-SIG can be called by various names such as the first SIG field, first SIG, first type SIG, control signal, control signal field, or first (type) control signal.

[0163] The U-SIG can contain N bits of information, including information for identifying the type of EHT PPDU. For example, the U-SIG is composed of two symbols (e.g., two consecutive OFDM symbols). Each symbol (e.g., OFDM symbol) for the U-SIG can have a duration of 4 us. Each symbol of the U-SIG is used to transmit 26 bits of information. For example, each U-SIG symbol is transmitted and received based on 52 data tones and 4 pilot tones.

[0164] For example, A-bit information (e.g., 52 uncoded bits) can be transmitted via the U-SIG (or U-SIG field). The first symbol of the U-SIG transmits the first X-bit information (e.g., 26 uncoded bits) of the total A-bit information, and the second symbol of the U-SIG transmits the remaining Y-bit information (e.g., 26 uncoded bits). For example, the transmitting STA can obtain the 26 uncoded bits included in each U-SIG symbol. The transmitting STA can perform convolutional encoding (i.e., BCC encoding) based on a rate of R=1 / 2 to generate 52-coded bits and perform interleaving on the 52-coded bits. The transmitting STA can perform BPSK modulation on the interleaved 52-coded bits to generate 52 BPSK symbols assigned to each U-SIG symbol. One U-SIG symbol is 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 are transmitted based on the remaining tones (subcarriers) excluding the pilot tones -21, -7, +7, and +21.

[0165] For example, A-bit information (e.g., 52 uncoded bits) transmitted by a U-SIG may include a CRC field (e.g., a 4-bit field) and a tail field (e.g., a 6-bit field). The CRC field and tail field are transmitted via the second symbol of the U-SIG. The CRC field is generated based on the 26 bits allocated to the first symbol of the U-SIG and the remaining 16 bits in the second symbol excluding the CRC / tail field, and is generated based on a conventional CRC calculation algorithm. The tail field is used to terminate the trellis of a convolutional decoder and is set to, for example, "000000."

[0166] The A-bit information (e.g., 52 uncoded bits) transmitted by a 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 allocated only to the first symbol of a U-SIG, or the version-independent bits can be allocated to both the first and second symbols of a U-SIG. For example, the version-independent bits and version-dependent bits can be called by various names, such as the first control bits and the second control bits.

[0167] 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. Furthermore, when transmitting an EHT PPDU, the transmitting STA may set the 3-bit PHY version identifier to the first value. Furthermore, the receiving STA may determine that the received PPDU is an EHT PPDU based on the PHY version identifier having the first value.

[0168] For example, the version-independent bits of the U-SIG may include a 1-bit UL / DL flag field, where a first value of the 1-bit UL / DL flag field is associated with UL communication and a second value of the UL / DL flag field is associated with DL communication.

[0169] For example, the version-independent bits of the U-SIG can include information about the length of the TXOP and information about the BSS color ID.

[0170] For example, if the EHT PPDU can be divided into various types (e.g., EHT PPDUs associated with SU mode, EHT PPDUs associated with MU mode, EHT PPDUs associated with TB mode, EHT PPDUs associated with Extended Range transmission, etc.), information about the type of EHT PPDU is included in the version-dependent bits of the U-SIG.

[0171] For example, the U-SIG may include information on: 1) a bandwidth field containing information about the bandwidth; 2) a field containing information about the MCS technique applied to the EHT-SIG; 3) an indication field containing information related to whether dual subcarrier modulation (DCM) technique is applied to the EHT-SIG; 4) a field containing information about the number of symbols used for the EHT-SIG; 5) a field containing information about whether the EHT-SIG is generated across the entire band; 6) a field containing information about the type of EHT-LTF / STF; and 7) a field indicating the length of the EHT-LTF and the CP length.

[0172] Preamble puncturing is applied to the PPDU in Figure 18. Preamble puncturing means applying puncturing to a portion of the entire bandwidth of the PPDU (e.g., the secondary 20 MHz band). For example, when an 80 MHz PPDU is transmitted, the STA applies puncturing to the secondary 20 MHz band of the 80 MHz band, and can transmit the PPDU only through the primary 20 MHz band and the secondary 40 MHz band.

[0173] For example, the preamble puncturing pattern is set in advance. For example, when a first puncturing pattern is applied, puncturing is applied only to the secondary 20 MHz band within the 80 MHz band. For example, when a second puncturing pattern is applied, puncturing is applied only to one of two secondary 20 MHz bands included in the secondary 40 MHz band within the 80 MHz band. For example, when a third puncturing pattern is applied, puncturing is applied only to the secondary 20 MHz band included in the primary 80 MHz band within the 160 MHz band (or 80+80 MHz band). For example, when a fourth puncturing pattern is applied, a primary 40 MHz band included in the primary 80 MHz band within the 160 MHz band (or 80+80 MHz band) is present, and puncturing is applied to at least one 20 MHz channel that does not belong to the primary 40 MHz band.

[0174] Information about preamble puncturing applied to the PPDU may be included in the U-SIG and / or EHT-SIG, for example, a first field of the U-SIG may include information about the contiguous bandwidth of the PPDU, and a second field of the U-SIG may include information about preamble puncturing applied to the PPDU.

[0175] For example, the U-SIG and EHT-SIG may contain information about preamble puncturing in the following manner: If the bandwidth of a PPDU exceeds 80 MHz, the U-SIGs are individually configured in 80 MHz increments. For example, if the bandwidth of a PPDU is 160 MHz, the PPDU may include a first U-SIG for a first 80 MHz band and a second U-SIG for a second 80 MHz band. In this case, the first field of the first U-SIG may contain information about the 160 MHz bandwidth, and the second field of the first U-SIG may contain information about the preamble puncturing applied to the first 80 MHz band (i.e., information about the preamble puncturing pattern). Also, the first field of the second U-SIG may contain information about the 160 MHz bandwidth, and the second field of the second U-SIG may contain information about the preamble puncturing applied to the second 80 MHz band (i.e., information about 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).

[0176] Additionally or essentially, the U-SIG and EHT-SIG may contain information about preamble puncturing based on the following method: The U-SIG may contain information about preamble puncturing for all bands (i.e., information about the preamble puncturing pattern). That is, the EHT-SIG does not contain information about preamble puncturing, and only the U-SIG may contain information about preamble puncturing (i.e., information about the preamble puncturing pattern).

[0177] U-SIGs are configured in 20 MHz units. For example, when an 80 MHz PPDU is configured, U-SIGs are duplicated. That is, the same four U-SIGs are included in the 80 MHz PPDU. PPDUs exceeding the 80 MHz bandwidth can contain different U-SIGs.

[0178] U-SIGs are configured in 20 MHz units. For example, when an 80 MHz PPDU is configured, U-SIGs are duplicated. That is, the same four U-SIGs are included in the 80 MHz PPDU. PPDUs exceeding the 80 MHz bandwidth can contain different U-SIGs.

[0179] The EHT-SIG in Figure 18 can include control information for the receiving STA. The EHT-SIG is transmitted over at least one symbol, and one symbol can have a length of 4 us. Information about the number of symbols used for the EHT-SIG is included in the U-SIG.

[0180] The EHT-SIG includes the technical features of the HE-SIG-B described in Figures 8 and 9. For example, the EHT-SIG can include a common field and a user-specific field, as in the example of Figure 8. The common field of the EHT-SIG is omitted, and the number of user-specific fields is determined based on the number of users.

[0181] As in the example of Figure 8, the common field of the EHT-SIG and the user specific field of the EHT-SIG are coded separately. One user block field included in the user specific fields can contain information for two users, while the last user block field included in the user specific fields can contain information for one user. That is, one user block field in the EHT-SIG can contain up to two user fields. As in the example of Figure 9, each user field is associated with either MU-MIMO allocation or non-MU-MIMO allocation.

[0182] Similar to the example of Figure 8, the common field of the EHT-SIG can include CRC bits and Tail bits, where the length of the CRC bits is determined to be 4 bits and the length of the Tail bits is determined to be 6 bits and set to "000000".

[0183] As in the example of Figure 8, the common field of the EHT-SIG can include RU allocation information. RU allocation information refers to information about the locations of RUs to which multiple users (i.e., multiple receiving STAs) are assigned. The RU allocation information is configured in 8-bit (or N-bit) units, as in Table 1.

[0184] Tables 5 through 7 show examples of 8-bit (or N-bit) information for various RU allocations. The indexes shown in each table can be changed, and some entries in Tables 5 through 7 can be omitted and others added.

[0185] Examples of Tables 5 to 7 relate to information about the locations of RUs allocated to the 20 MHz band. For example, "Index 0" in Table 5 is used in a situation where nine 26 RUs are individually allocated (e.g., the situation shown in Figure 5 where nine 26 RUs are individually allocated).

[0186] On the other hand, in an EHT system, multiple RUs can be assigned to one STA. For example, in Table 6, "Index 60" has one 26RU assigned to one user (i.e., the receiving STA) at the left end of the 20 MHz band, one 26RU and one 52RU assigned to another user (i.e., the receiving STA) to the right of that, and five 26RUs assigned individually to the right of that.

[0187] [Table 5]

[0188] [Table 6]

[0189] [Table 7]

[0190] A mode in which the common field of the EHT-SIG is omitted is supported. The mode in which the common field of the EHT-SIG is omitted can be called compressed mode. When 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 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.

[0191] The EHT-SIG can be configured based on various MCS techniques. As described above, information related to the MCS technique applied to the EHT-SIG is included in the U-SIG. The EHT-SIG can be configured based on the DCM technique. For example, of N data tones (e.g., 52 data tones) allocated for the EHT-SIG, a first modulation technique is applied to consecutive half of the tones, and a second modulation technique is applied to the remaining consecutive half of the tones. That is, the transmitting STA can modulate specific control information onto a first symbol based on a first modulation technique and assign it to consecutive half of the tones, and modulate the same control information onto a second symbol based on a second modulation technique and assign it to the remaining consecutive half of the tones. As described above, information related to whether the DCM technique is applied to the EHT-SIG (e.g., a 1-bit field) is included in the U-SIG. The EHT-STF of FIG. 18 is used to improve automatic gain control estimation in a multiple input multiple output (MIMO) environment or an OFDMA environment. The EHT-LTF of FIG. 18 is used to estimate the channel in a MIMO environment or an OFDMA environment.

[0192] The EHT-STF in FIG. 18 can be configured as various types. For example, the first type of STF (i.e., 1x STF) is generated based on a type-1 STF sequence in which non-zero coefficients are allocated to 16 subcarrier intervals. The STF signal generated based on the type-1 STF sequence can have a period of 0.8 μs, and a 0.8 μs periodic signal is repeated five times to form a type-1 STF with a length of 4 μs. For example, the second type of STF (i.e., 2x STF) is generated based on a type-2 STF sequence in which non-zero coefficients are allocated to 8 subcarrier intervals. The STF signal generated based on the type-2 STF sequence can have a period of 1.6 μs, and a 1.6 μs periodic signal is repeated five times to form a type-2 EHT-STF with a length of 8 μs. An example of a sequence for configuring an EHT-STF (i.e., an EHT-STF sequence) is presented below. The following sequence can be modified in various ways.

[0193] EHT-STF is constructed based on the following M-sequence:

[0194] [Number 1] M={-1,-1,-1,1,1,1,-1,1,1,1,-1,1,1,-1,1}

[0195] The EHT-STF for a 20 MHz PPDU is constructed based on the following equation. The following example is a type 1 (i.e., 1x STF) sequence. For example, a type 1 sequence is included in an EHT-PPDU that is not a trigger-based (TB) PPDU. In the following equations, (a:b:c) refers to the interval defined as b tone interval (i.e., subcarrier interval) from tone index a (i.e., subcarrier index) to tone index c (i.e., subcarrier interval). For example, Equation 2 below can represent a sequence defined as a 16-tone interval from tone index -112 to 112 index. Since a subcarrier spacing of 78.125 kHz is applied to the EHT-STF, the 16-tone interval means that the EHT-STF coefficient (or element) is placed at an interval of 78.125 * 16 = 1250 kHz. Also, * means multiplication, and sqrt() means square root.

[0196] [Number 2] EHT-STF(-112:16:112)={M}*(1+j) / sqrt(2) EHT-STF(0)=0

[0197] The EHT-STF for 40MHz PPDU is constructed based on the following formula: The following example is a first type (ie, 1x STF) sequence.

[0198] [Number 3] EHT-STF(-240:16:240)={M,0,-M}*(1+j) / sqrt(2)

[0199] The EHT-STF for 80MHz PPDU is constructed based on the following formula: The following example is a first type (ie, 1x STF) sequence.

[0200] [Number 4] EHT-STF(-496:16:496)={M,1,-M,0,-M,1,-M}*(1+j) / sqrt(2)

[0201] The EHT-STF for 160MHz PPDU is constructed based on the following formula: The following example is a first type (ie, 1x STF) sequence.

[0202] [Number 5] EHT-STF(-1008:16:1008)={M,1,-M,0,-M,1,-M,0,-M,-1,M,0,-M,1,-M}*(1+j) / sqrt(2)

[0203] The sequence for the lower 80 MHz of the EHT-STF for the 80+80 MHz PPDU is the same as Equation 4. The sequence for the upper 80 MHz of the EHT-STF for the 80+80 MHz PPDU is configured based on the following equation.

[0204] [Number 6] EHT-STF(-496:16:496)={-M,-1,M,0,-M,1,-M}*(1+j) / sqrt(2)

[0205] Equations 7 to 11 below relate to an example of a second type (ie, 2x STF) sequence.

[0206] [Number 7] EHT-STF(-120:8:120)={M,0,-M}*(1+j) / sqrt(2)

[0207] The EHT-STF for 40MHz PPDU is constructed based on the following formula:

[0208] [Number 8] EHT-STF(-248:8:248)={M,-1,-M,0,M,-1,M}*(1+j) / sqrt(2) EHT-STF(-248)=0 EHT-STF(248)=0

[0209] The EHT-STF for 80MHz PPDU is constructed based on the following formula:

[0210] [Number 9] EHT-STF(-504:8:504)={M,-1,M,-1,-M,-1,M,0,-M,1,M,1,-M,1,-M}*(1+j) / sqrt(2)

[0211] The EHT-STF for 160MHz PPDU is constructed based on the following formula:

[0212] [Number 10] EHT-STF(-1016:16:1016)={M,-1,M,-1,-M,-1,M,0,-M,1,M,1,-M,1,-M,0,-M,1,-M,1,M,1,-M,0,-M,1,M,1,-M,1,-M}*(1+j) / sqrt(2) EHT-STF(-8)=0,EHT-STF(8)=0, EHT-STF(-1016)=0,EHT-STF(1016)=0

[0213] The sequence for the lower 80 MHz of the EHT-STF for the 80+80 MHz PPDU is the same as Equation 9. The sequence for the upper 80 MHz of the EHT-STF for the 80+80 MHz PPDU is configured based on the following equation.

[0214] [Number 11] EHT-STF(-504:8:504)={-M,1,-M,1,M,1,-M,0,-M,1,M,1,-M,1,-M}*(1+j) / sqrt(2) EHT-STF(-504)=0, EHT-STF(504)=0

[0215] EHT-LTF can have three types (i.e., 1x, 2x, and 4xLTF). For example, the first, second, and third type LTFs are generated based on an LTF sequence in which non-zero coefficients are placed in 4, 2, and 1 subcarrier intervals. The first, second, and third type LTFs can have time lengths of 3.2, 6.4, and 12.8 μs. GIs of various lengths (e.g., 0.8, 1, 6, and 3.2 μs) are applied to the first, second, and third type LTFs.

[0216] Information about the type of STF and / or LTF (including information about the GI applied to the LTF) is included in the SIG A field and / or SIG B field of FIG.

[0217] The PPDU in FIG. 18 (ie, EHT-PPDU) is configured based on the examples in FIGS.

[0218] For example, an EHT PPDU transmitted on a 20 MHz band, i.e., a 20 MHz EHT PPDU, is configured based on the RUs in Fig. 5. That is, the RU locations of the EHT-STF, EHT-LTF, and data fields included in the EHT PPDU are determined as shown in Fig. 5.

[0219] The EHT PPDU transmitted on the 40 MHz band, i.e., the 40 MHz EHT PPDU, is configured based on the RU in Figure 6. That is, the RU locations of the EHT-STF, EHT-LTF, and data fields included in the EHT PPDU are determined as shown in Figure 6.

[0220] Since the RU position in Figure 6 corresponds to 40 MHz, the tone plan for 80 MHz is determined by repeating the pattern in Figure 6 twice. That is, the 80 MHz EHT PPDU is transmitted based on a new tone plan in which the RU in Figure 6 is repeated twice, not the RU in Figure 7.

[0221] 6 is repeated twice, 23 tones (i.e., 11 guard tones + 12 guard tones) are configured in the DC region. That is, the tone plan for an 80 MHz EHT PPDU allocated based on OFDMA can have 23 DC tones. On the other hand, an 80 MHz EHT PPDU allocated based on non-OFDMA (i.e., non-OFDMA full bandwidth 80 MHz PPDU) is configured based on 996RU and can include 5 DC tones, 12 left guard tones, and 11 right guard tones.

[0222] The tone plan for 160 / 240 / 320MHz is constructed by repeating the pattern in Figure 6 many times.

[0223] The PPDU in FIG. 18 is identified as an EHT PPDU based on the following method.

[0224] The receiving STA can determine the type of the received PPDU as an 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) the result of applying 'modulo 3' to the value of the Length field of the L-SIG of the received PPDU is detected as '0', the received PPDU is determined to be an EHT PPDU. If the received PPDU is determined to be an 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. 18. In addition, 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 a BSPK, 2) the RL-SIG that follows the L-SIG field and is the same as the L-SIG, and 3) the L-SIG including the Length field, where the result of applying "modulo 3" is set to "0".

[0225] For example, the receiving STA can determine the type of the received PPDU as an 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 is determined to be an HE PPDU.

[0226] For example, the receiving STA can determine the type of the received PPDU as non-HT, HT, or VHT PPDU based on the following: 1) the first symbol after the L-LTF signal is BPSK, and 2) if an RL-SIG in which the L-SIG is repeated is not detected, the received PPDU is determined to be a 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 is determined to be a non-HT, HT, or VHT PPDU.

[0227] In the following example, signals indicated as (send / receive / up / down) signals, (send / receive / up / down) frames, (send / receive / up / down) packets, (send / receive / up / down) data units, (send / receive / up / down) data, etc. are signals transmitted and received based on the PPDU of FIG. 18. The PPDU of FIG. 18 is used to transmit and receive various types of frames. For example, the PPDU of FIG. 18 is used for a control frame. Examples of control frames include a request to send (RTS), a clear to send (CTS), a Power Save-Poll (PS-Poll), a Block ACK Req, a Block ACK, a Null Data Packet (NDP) announcement, and a Trigger frame. For example, the PPDU of FIG. 18 is used for a management frame. Examples of management frames 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. 18 is used for a data frame. For example, the PPDU in Fig. 18 may be used to simultaneously transmit at least two or more of a control frame, a management frame, and a data frame.

[0228] FIG. 19 shows a variation of the transmitting device and / or receiving device of this specification.

[0229] Each device / STA in Figure 1(a) / (b) is modified as shown in Figure 19. The transceiver (630) in Figure 19 is the same as the transceivers (113, 123) in Figure 1. The transceiver (630) in Figure 19 can include a receiver and a transmitter.

[0230] The processor (610) in FIG. 19 is the same as the processors (111, 121) in FIG. 1. Alternatively, the processor (610) in FIG. 19 is the same as the processing chips (114, 124) in FIG.

[0231] The memory (150) in FIG. 19 is the same as the memories (112, 122) in FIG. 1. Alternatively, the memory (150) in FIG. 19 is a separate external memory different from the memories (112, 122) in FIG.

[0232] Referring to Figure 19, the power management module 611 manages power for the processor 610 and / or transceiver 630. The battery 612 provides power to the power management module 611. The display 613 outputs the results processed by the processor 610. The keypad 614 receives inputs used by the processor 610. The keypad 614, which describes the phase rotation value, can be displayed on the display 613. The 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 subscribers in mobile phone devices such as mobile phones and computers.

[0233] 19, 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).

[0234] 1. 802.11ax Wireless LAN System Tone Plan

[0235] In this specification, a tone plan refers to a rule for determining the size and / or location of a Resource Unit (RU). The following describes a tone plan applied to a PPDU according to the IEEE 802.11ax standard, i.e., an HE PPDU. The following also describes the RU size and RU location applied to the HE PPDU, as well as control information related to the RU applied to the HE PPDU.

[0236] In this specification, control information related to an RU (or control information related to a tone plan) may include control information related to the size and location of the RU, information about the user STA assigned to a specific RU, the frequency bandwidth for the PPDU including the RU, and / or the modulation technique applied to a specific RU. The control information related to the RU is included in the SIG field. For example, in the IEEE 802.11ax standard, control information related to the RU is included in the HE-SIG-B field. That is, in the process of generating a transmission PPDU, a transmitting STA may include control information for the RU included in the PPDU in the HE-SIG-B field. Furthermore, a receiving STA may receive the HE-SIG-B included in the received PPDU, obtain the control information included in the HE-SIG-B, determine whether there is an RU assigned to the corresponding receiving STA, and decode the assigned RU based on the HE-SIG-B.

[0237] In the IEEE 802.11ax standard, the HE-STF, HE-LTF, and Data fields are configured in units of RUs. That is, when a first RU for a first receiving STA is configured, the STF / LTF / Data fields for the first receiving STA are transmitted and received via the first RU.

[0238] In the IEEE 802.11ax standard, a PPDU for one receiving STA (i.e., SU PPDU) and a PPDU for multiple receiving STAs (i.e., MU PPDU) are separately defined, and a tone plan for each is separately defined. The details are described below.

[0239] An RU defined in 11ax can include multiple subcarriers. For example, if an RU includes N subcarriers, it can be referred to as an N-tone RU or NRU. The location of a specific RU can be referred to as a subcarrier index. The subcarrier index is defined as a subcarrier frequency spacing unit. In the 11ax standard, subcarrier frequency spacing is 312.5 kHz or 78.125 kHz, and the subcarrier frequency spacing for an RU is 78.125 kHz. That is, subcarrier index +1 for an RU means a position that is 78.125 kHz higher than the DC tone, and subcarrier index -1 for an RU means a position that is 78.125 kHz lower than the DC tone. For example, if the location of a specific RU is represented as [-121:-96], the RU is located in the range from subcarrier index -121 to subcarrier index -96, and as a result, the RU can include 26 subcarriers.

[0240] An N-tone RU may contain pilot tones that have already been configured.

[0241] 2. Null subcarrier and pilot subcarrier

[0242] This article explains subcarrier and resource allocation in 802.11ax systems.

[0243] An OFDM symbol is composed of subcarriers, and the number of subcarriers can function as the bandwidth of the PPDU. In the WLAN 802.11 system, data subcarriers used for data transmission, pilot subcarriers used for phase information and parameter tracking, and unused subcarriers not used for data transmission and pilot transmission are defined.

[0244] An HE MU PPDU using OFDMA transmission is transmitted by mixing 26-tone RU, 52-tone RU, 106-tone RU, 242-tone RU, 484-tone RU, and 996-tone RU.

[0245] Here, a 26-tone RU consists of 24 data subcarriers and 2 pilot subcarriers. A 52-tone RU consists of 48 data subcarriers and 4 pilot subcarriers. A 106-tone RU consists of 102 data subcarriers and 4 pilot subcarriers. A 242-tone RU consists of 234 data subcarriers and 8 pilot subcarriers. A 484-tone RU consists of 468 data subcarriers and 16 pilot subcarriers. A 996-tone RU consists of 980 data subcarriers and 16 pilot subcarriers.

[0246] 1) Null subcarrier

[0247] As shown in Figures 5 to 7, there are null subcarriers between the 26-tone RU, 52-tone RU, and 106-tone RU locations. The null subcarriers are located around the DC or edge tones to protect against transmit center frequency leakage, receiver DC offset, and interference from adjacent RUs. Null subcarriers have an energy of 0. The null subcarrier indices are listed as follows:

[0248] JPEG2026042835000009.jpg97170

[0249] The null subcarrier positions for each 80 MHz frequency segment of the 80+80 MHz HE PPDU must follow the positions of the 80 MHz HE PPDU.

[0250] 2) Pilot subcarrier

[0251] If pilot subcarriers are present in the HE-LTF field of an HE SU PPDU, HE MU PPDU, HE ER SU PPDU, or HE TB PPDU, the positions of the pilot sequences in the HE-LTF field and data field are the same as those in 4x HE-LTF. In 1x HE-LTF, the positions of the pilot sequences in the HE-LTF consist of pilot subcarriers for the data field multiplied by 4. If pilot subcarriers are present in 2x HE-LTF, the positions of the pilot subcarriers must be the same as those in 4x data symbols. All pilot subcarriers are located at even indexes as listed below.

[0252] JPEG2026042835000010.jpg43159

[0253] JPEG2026042835000011.jpg66160

[0254] In 160 MHz or 80+80 MHz, the pilot subcarrier positions must be the same 80 MHz positions for both 80 MHz bands.

[0255] 3. HE transmit procedure and phase rotation

[0256] In an 802.11ax WLAN system, the transmission procedures in the PHY (physical) include a transmission procedure for an HE SU (Single User) PPDU, a transmission procedure for an HE ER (Extended Range) SU PPDU, a transmission procedure for an HE MU (Multi User) PPDU, and a transmission procedure for an HE TB (Trigger-Based) PPDU. The FORMAT field of the PHY-TXSTART.request (TXVECTOR) is the same as HE_SU, HE_MU, HE_ER_SU, or HE_TB. The transmission procedures do not describe the operation of optional features such as DCM (Dual Carrier Modulation). Of the various transmission procedures, Figure 21 shows only the PHY transmission procedure for the HE SU PPDU.

[0257] FIG. 20 shows an example of a PHY transmission procedure for an HE SU PPDU.

[0258] To transmit data, the MAC generates a PHY-TXSTART.request primitive, which causes the PHY entity to enter a transmit state. The PHY is also configured to operate at the appropriate frequency via station management via the PLME. Other transmit parameters, such as the HE-MCS, coding type, and transmit power, are configured via the PHY-SAP using the PHY-TXSTART.request(TXVECTOR) primitive. After transmitting the PPDU carrying the trigger frame, the MAC sublayer can issue a PHY-TRIGGER.request with the TRIGVECTOR parameter, which provides the PHY entity with the information necessary to demodulate the expected HE TB PPDU response.

[0259] The PHY indicates the status of the primary channel and other channels via PHY-CCA.indication. PPDU transmission must be initiated by the PHY after receiving the PHY-TXSTART.request(TXVECTOR) primitive.

[0260] After the PHY preamble transmission starts, the PHY entity immediately starts data scrambling and data encoding. The encoding method for the data field is based on the FEC_CODING, CH_BANDWIDTH, NUM_STS, STBC, MCS, and NUM_USERS parameters of the TXVECTOR.

[0261] The SERVICE field and PSDU are encoded in the transmitter block diagram (described below). Data must be exchanged between the MAC and PHY via a series of PHY-DATA.request(DATA) primitives issued by the MAC and PHY-DATA.confirm primitives issued by the PHY. PHY padding bits are appended to the PSDU to make the number of coded bits in the PSDU an integer multiple of the number of coded bits per OFDM symbol.

[0262] Transmission may be terminated early by the MAC via the PHY-TXEND.request primitive. PSDU transmission is terminated by receiving a PHY-TXEND.request primitive. Each PHY-TXEND.request primitive may be acknowledged by the PHY with a PHY-TXEND.confirm primitive.

[0263] Packet extension and / or signal extension can be present in the PPDU. The PHY-TXEND.confirm primitive is generated at the actual end time of the most recent PPDU, the end time of the packet extension, and the end time of the signal extension.

[0264] In PHY, a GI (Guard Interval) specified together with the GI duration by the GI_TYPE parameter of TXVECTOR is inserted into all data OFDM symbols as a countermeasure against delay spread.

[0265] Once the PPDU transmission is complete, the PHY entity enters the receive state.

[0266] FIG. 21 shows an example of a block diagram of a transmitter that generates each field of an HE PPDU.

[0267] The following block diagram is used to generate each field of the HE PPDU.

[0268] a) pre-FECPHY padding

[0269] b) Scrambler

[0270] c) FEC (BCC or LDPC) encoders

[0271] d) post-FECPHY padding

[0272] e) Streamparser

[0273] f) Segment parser (for contiguous 160MHz and non-contiguous 80+80MHz transmission)

[0274] g) BCC interleaver

[0275] h)星座映射器

[0276] i)DCM音调映射器

[0277] j)导频插入

[0278] k)在多个20MHz上进行复制(对于BW > 20MHz)

[0279] l)乘以1 ,

[0287] , , , ,

[0285] , , , , , , ,

[0284] ,

[0288] ,

[0286] P的列 HE-LTF

[0280] m)LDPC音调映射器

[0281] n)段解复用器

[0282] o)单空间流的空时分组码(STBC)编码器

[0283] p)每个STS插入的循环移位分集(CSD)

[0284] q)空间映射器

[0285] r)频率映射

[0286] s)离散傅里叶逆变换(IDFT)

[0287] f)每个链插入的循环移位分集(CSD)

[0288] u)保护间隔(GI)插入

[0289] v) Windowing

[0290] Figure 21 shows a block diagram of a transmitter used to generate a data field of an HE SU (Single User) PPDU to which LDPC encoding is applied and transmitted in a 160 MHz band. If the transmitter block diagram is used to generate a data field of an HE SU PPDU to be transmitted in an 80+80 MHz band, the segment deparser is not used as in Figure 21. In other words, when the segment parser is divided into an 80 MHz band and another 80 MHz band, the transmitter block diagram is used for each 80 MHz band.

[0291] 21, a data field (or a data bit string) is encoded by an LDPC encoder. The data bit string input to the LDPC encoder is scrambled by a scrambler.

[0292] The data bit sequence encoded by the LDPC encoder is divided into a plurality of spatial streams by a stream parser. In this case, the encoded data bit sequence divided into each spatial stream can be called a spatial block. The number of spatial blocks is determined by the number of spatial streams used to transmit the PPDU and is set to the same number as the number of spatial streams.

[0293] Each spatial block is divided into at least one data fragment by a segment parser. When a data field is transmitted in a 160 MHz band as shown in Figure 22, the 160 MHz band is divided into two 80 MHz bands, and each 80 MHz band is divided into a first data fragment and a second data fragment. Then, the first and second data fragments are constellation mapped to the 80 MHz band, respectively, to become LDPC mapped.

[0294] In HE MU transmission, except that cyclic shift diversity (CSD) is performed with knowledge of the space-time stream start index for that user, the PPDU encoding processor runs independently in the Resource Unit (RU) for each user up to the input of the spatial mapping block. All user data in the RU is concatenated and mapped to the transmit chain of the spatial mapping block.

[0295] In 802.11ax, phase rotation is applied to the fields from the legacy preamble to just before the HE-STF, and the phase rotation value is defined in 20 MHz units. That is, among the fields of the HE PPDU defined in 802.11ax, phase rotation is applied to the L-STF, L-LTF, L-SIG, RL-SIG, HE-SIG-A, and HE-SIG-B.

[0296] The L-STF of the HE PPDU is constructed as follows:

[0297] JPEG2026042835000012.jpg43148

[0298] JPEG2026042835000013.jpg52147

[0299] The L-LTF of the HE PPDU is configured as follows:

[0300] JPEG2026042835000014.jpg93147

[0301] The L-SIG of the HE PPDU is configured as follows:

[0302] JPEG2026042835000015.jpg45147

[0303] JPEG2026042835000016.jpg89147

[0304] The RL-SIG of the HE PPDU is structured as follows:

[0305] JPEG2026042835000017.jpg113148

[0306] JPEG2026042835000018.jpg18148

[0307] The following describes the value of the phase rotation.

[0308] JPEG2026042835000019.jpg1525 is used to indicate the phase rotation of the tone. JPEG2026042835000020.jpg1525 is determined by the TXVECTOR parameter CH_BANDWIDTH as follows:

[0309] JPEG2026042835000021.jpg45149

[0310] For each bandwidth The values ​​for JPEG2026042835000022.jpg1525 are as follows:

[0311] JPEG2026042835000023.jpg77150

[0312] JPEG2026042835000024.jpg33150

[0313] The phase rotation values ​​are defined in 20 MHz increments, so the phase rotation values ​​used for 80 MHz PPDU transmission are [1,-1,-1,-1], and the phase rotation values ​​used for 80+80 MHz or 160 MHz PPDU transmission are [1,-1,-1,-1,1,-1,-1,-1].

[0314] 4. Embodiments Applicable to This Specification

[0315] In order to increase peak throughput, the WLAN 802.11 system is considering using a wider band than the existing 802.11ax or transmitting an increased number of streams using more antennas. This specification also considers a method of using various bands in aggregation.

[0316] In this specification, when a PPDU is transmitted using a wideband (240 MHz or 320 MHz), phase rotation is proposed to be applied to the Legacy preamble and EHT-SIG part of the PPDU (or up to the field immediately before the EHT-STF). In particular, phase rotation optimized for limited preamble puncturing situations is proposed.

[0317] A typical structure of an 802.11be PPDU (EHT PPDU) is shown in Figure 18. The U-SIG consists of a version independent field and a version dependent field. The U-SIG is made up of two symbols, which are jointly encoded and consist of 52 data tones and 4 pilot tones at 20 MHz each. It is modulated in the same way as the HE-SIG-A. The EHT-SIG is divided into a common field and a user specific field and is encoded into a variable MCS. Information for allocating RUs is carried in the common field and user specific field.

[0318] Phase rotation is applied to reduce the PAPR (Peak-to-Average Power Ratio) when transmitting a PPDU at the transmitting end. This can be applied to the field from the L-preamble to just before the EHT-STF, and the phase rotation value is defined in 20 MHz increments.

[0319] In 802.11be, contiguous 240 / 320 MHz and non-contiguous 160+80 / 80+160 / 160+160 MHz bandwidths are added to the existing 20 / 40 / 80 / 160 / 80+80 MHz bandwidths. Here, 240 / 160+80 / 80+160 MHz can be considered as puncturing the 80 MHz portion of 320 MHz or 160+160 MHz. That is, the phase rotation values ​​used for 320 MHz or 160+160 MHz can be applied to 240 / 160+80 / 80+160 MHz, excluding the punctured 80 MHz phase rotation. Therefore, this specification first proposes 320 MHz or 160+160 MHz phase rotation, and the 240 / 160+80 / 80+160 MHz phase rotation created by puncturing this will be described later. This embodiment also proposes additional phase rotation at 240 / 160+80 / 80+160 MHz. Furthermore, this embodiment proposes one unified phase rotation that can reduce the PAPR as much as possible when considering limited preamble puncturing conditions and the full band allocation condition and the corresponding preamble puncturing condition simultaneously.

[0320] As explained above, the phase rotation values ​​used for 80 MHz PPDU transmission in the 802.11ax WLAN system are [1, -1, -1, -1], and the phase rotation values ​​used for 80+80 MHz or 160 MHz PPDU transmission are [1, -1, -1, -1, 1, -1, -1, -1].

[0321] The subcarrier index for 80MHz is -128 to 127, and the first coefficient value of the above phase rotation is applied to the -128 to -65 subcarriers, the second coefficient value is applied to the -64 to -1 subcarriers, the third coefficient value is applied to the 0 to 63 subcarriers, and the fourth coefficient value is applied to the 64 to 127 subcarriers.

[0322] In this specification, subcarrier indices (e.g., −128 to 127) are set based on a subcarrier spacing of N kHz. That is, subcarrier index 0 is a DC component in the frequency domain, subcarrier index 1 (i.e., +1 subcarrier) refers to a tone / subcarrier corresponding to +N kHz, and subcarrier index −1 (i.e., −1 subcarrier) refers to a tone / subcarrier corresponding to −N kHz. An example of the N value is 78.125 kHz. For example, the phase rotation value for the 80 MHz band of 802.11ax has four coefficient values, i.e., 1, −1, −1, and −1, where the first coefficient value (“1”) is applied to subcarriers −128 to −65, and the second coefficient value (“−1”) is applied to subcarriers −64 to −1. In addition, the third coefficient value ("-1") is applied to subcarriers 0 to 63, and the fourth coefficient value ("-1") is applied to subcarriers 64 to 127.

[0323] 4.1.320MHz or 160+160MHz

[0324] Phase rotation is proposed based on the contiguous 320MHz, and phase rotation for non-contiguous 160+160MHz is proposed as follows: The phase rotation of the low-frequency 160MHz portion of the contiguous 320MHz is directly applied to the phase rotation of the low-frequency 160MHz portion of the non-contiguous 160+160MHz, and the phase rotation of the high-frequency 160MHz portion of the contiguous 320MHz is directly applied to the phase rotation of the high-frequency 160MHz portion of the non-contiguous 160+160MHz.

[0325] The subcarrier index of the contiguous 320MHz is -512 to 511, and the various phase rotation values ​​proposed below have the following form:

[0326] [abcdefghijklmnop]

[0327] This means that the phase rotation is applied to each 20MHz from the low frequency 20MHz to the high frequency 20MHz, i.e., a is -512 to -449, b is -448 to -385, c is -384 to -321, d is -320 to -257, e is -256 to -193, f is -192 to -129, g is -128 to -65, h is -64 to -1, i is 0 to 63, j is 64 to 127, k is 128 to 191, l is 192 to 255, m is 256 to 319, n is 320 to 383, o is 384 to 447, and p is 448 to 511.

[0328] Also, at 320 MHz, in addition to full band allocation, limited preamble puncturing is considered as follows:

[0329] Full band allocation:[OOOO OOOO OOOO OOOO]

[0330] Preamble puncturing:

[0331] [XXOO OOOO OOOO OOOO]

[0332] [OOXX OOOO OOOO OOOO]

[0333] [OOOO XXOO OOOO OOOO]

[0334] [OOOO OOXX OOOO OOOO]

[0335] [OOOO OOOO XXOO OOOO]

[0336] [OOOO OOOO OOXX OOOO]

[0337] [OOOO OOOO OOOO XXOO]

[0338] [OOOO OOOO OOOO OOXX]

[0339] [XXXX OOOO OOOO OOOO]

[0340] [OOOO XXXX OOOO OOOO]

[0341] [OOOO OOOO XXXX OOOO]

[0342] [OOOO OOOO OOOO XXXX]

[0343] In the above, O or X means that a particular 20MHz channel is punctured or not, and the frequencies are expressed in order from the lowest 20MHz channel to the highest 20MHz channel.

[0344] The PAPR calculations used L-STF and L-LTF and assumed a 4x IFFT / IDFT (eg, an IFFT / IDFT based on a subcarrier spacing of 78.125 kHz).

[0345] The preamble puncturing pattern is indicated by the Punctured Channel Information field of the U-SIG (U-SIG-2), which consists of 5 bits.

[0346] Specifically, when a PPDU is transmitted using a non-OFDMA method, the 5 bits of the Punctured Channel Information field are set according to the items in the following table to signal the non-OFDMA puncturing pattern for the entire PPDU bandwidth. The following table defines the preamble puncturing patterns in the non-OFDMA method for each PPDU bandwidth. Values ​​that are not defined in the Punctured Channel Information field are valid.

[0347] JPEG2026042835000025.jpg62157

[0348] JPEG2026042835000026.jpg107162

[0349] JPEG2026042835000027.jpg115156

[0350] As another example, when a PPDU is transmitted using the OFDMA method, if the bandwidth is specified as 80 / 160 / 320 MHz based on the BW (bandwidth) field of U-SIG-1, a 4-bit bitmap (the last bit is ignored) in the Punctured Channel Information field can indicate whether or not to puncture a 20 MHz channel for each 80 MHz segment. The 4-bit bitmap is applied from the lowest to the highest frequency 20 MHz channel in order from the lowest bit to the highest bit. If each bit in the 4-bit bitmap indicates 0, the corresponding 20 MHz channel is punctured, and if each bit in the 4-bit bitmap indicates 1, the corresponding 20 MHz channel is not punctured. The permitted puncturing patterns for an 80 MHz segment are as follows: 0111, 1011, 1101, 1110, 0011, 1100, and 1001. Other field values ​​are also valid in addition to the permitted puncturing patterns. The field values ​​for the puncturing pattern may be different for different 80 MHz bands.

[0351] We also explain the transmitter modulation accuracy (EVM) test, which is related to the RF capability described later.

[0352] The procedure for transmitter modulation accuracy testing for occupied subcarriers of a PPDU is as follows.

[0353] a) The start of a PPDU must be detected.

[0354] b) The test equipment must be able to detect the transition from L-STF to L-LTF and set precise timing.

[0355] c) The test equipment must estimate the fine frequency offset approximately.

[0356] d) The symbols of the PPDU need to be de-rotated by the estimated frequency offset. The sampling offset drift also needs to be compensated.

[0357] e) For each EHT-LTF symbol, the test equipment converts the symbol to a subcarrier received value, estimates the phase from the pilot subcarrier, and de-rotates the subcarrier value according to the estimated phase. For a 320 MHz PPDU, the phase estimation is robust against uncorrelated phase noise in the lower and upper 160 MHz frequency portions of the PPDU. If the lower and upper 160 MHz channels have uncorrelated phase noise, the 320 MHz PPDU is transmitted via two RFs with 160 MHz capability. If the lower and upper 160 MHz channels have correlated phase noise, the 320 MHz PPDU is transmitted via a single RF with 320 MHz capability.

[0358] f) The test equipment estimates the complex channel response coefficients for each subcarrier and each transmitted stream.

[0359] g) For each data OFDM symbol, the test equipment converts the symbol to a subcarrier received value, estimates the phase from the pilot subcarriers, compensates the subcarrier value by the estimated phase, and groups the results of all receiver chains for each subcarrier as follows: Multiply the vector by a zero-forcing equalization matrix generated in the estimated channel. For a 320 MHz PPDU, the phase estimation is robust to uncorrelated noise in the lower and upper 160 MHz frequency parts of the PPDU.

[0360] h) The test equipment finds the closest constellation point to each data-carrying subcarrier in each spatial stream of the RU under test and calculates the Euclidean distance from that point.

[0361] i) The test equipment calculates the RMS of all errors per PPDU, averaged over the PPDU.

[0362] 4.1.1. Existing 160MHz phase rotation repetition

[0363] By simply repeating the existing 160MHz phase rotation twice [1 -1 -1 -1 1 -1 -1 -1 1 -1 -1 -1 1 -1 -1 -1 1 -1 -1], the PAPR of L-STF and L-LTF can be calculated when considering the following various cases. This is simply an extension of the existing one, and since it is the same for all 80MHz or 160MHz units, additional implementation may not be necessary. In other words, there is an implementation benefit when transmitting a 320MHz PPDU using several 80MHz capa RFs (RFs with 80MHz capability) and 160MHz capa RFs (RFs with 160MHz capability).

[0364] 4.1.1.A 320MHz RF capability consideration

[0365] PPDU can be transmitted to one 320MHz capa RF (RF with 320MHz capability). In this case, the max PAPR value for L-STF / L-LTF is as shown in Table 8.

[0366] [Table 8]

[0367] 4.1.1.B.160 / 320MHz RF capability consideration

[0368] PPDUs can be transmitted over two 160MHz capa RFs or one 320MHz capa RF. In this case, the max PAPR values ​​for L-STF / L-LTF are the same as those in Table 8.

[0369] 4.1.1.C.80 / 160 / 320MHz RF capability consideration

[0370] PPDUs can be transmitted using four 80MHz capa RFs, two 80MHz capa RFs and one 160MHz capa RF, two 160MHz capa RFs, or one 320MHz capa RF. When two 80MHz capa RFs and one 160MHz capa RF are used, only the case where the 160MHz RF is applied to one of the two 160MHz bands to generate a PPDU is considered. In other words, the case where a 160MHz RF is used in the middle 160MHz band and two 80MHz RFs are applied to the remaining 80MHz bands is not considered. In this case, the max PAPR value for L-STF / L-LTF is the same as in Table 8.

[0371] In this embodiment, when PPDUs are transmitted to RFs with various capabilities by repeating the existing 160 MHz phase rotation while considering all preamble puncturing patterns, rather than limited preamble puncturing, the max PAPR values ​​for L-STF / L-LTF are as shown in Table 9.

[0372] [Table 9]

[0373] Comparing Table 8 with Table 9, it can be seen that the phase rotation value of this embodiment defined in the 320 MHz band considering limited preamble puncturing patterns has a lower PAPR than the phase rotation value defined in the 320 MHz band considering all preamble puncturing patterns. The phase rotation value proposed in this embodiment has the novel effect of ensuring improved performance in the 320 MHz band without complex implementation.

[0374] 4.1.2.Additional phase rotation in 160MHz increments

[0375] Considering the case of transmitting using one 320MHz capa RF, an additional phase rotation value can be multiplied in 160MHz units to reduce PAPR. {ab} means the phase rotation that is further multiplied in 160MHz units. That is, a is the phase rotation that is further multiplied to the subcarrier from -512 to -1, and b is the phase rotation that is further multiplied to the subcarrier from 0 to 511, and is further multiplied to the above repeated phase rotation to form a new phase rotation value.

[0376] 4.1.2.A.320MHz RF capability consideration

[0377] The additional phase rotation that minimizes the L-STF / L-LTF PAPR is {1,-1}, and the phase rotation per 20 MHz can be expressed as shown in Table 10.

[0378] [1 -1 -1 -1 1 -1 -1 -1 -1 1 1 1 1 -1 1 1 1]

[0379] The same PAPR can be obtained by adding the whole and multiplying it by a specific value.

[0380] [Table 10]

[0381] 4.1.2.B.160 / 320MHz RF capability consideration

[0382] The optimal phase rotation and PAPR are the same as those in Table 10.

[0383] 4.1.2.C.80 / 160 / 320MHz RF capability consideration

[0384] The optimal phase rotation and PAPR are the same as those in Table 10.

[0385] In this embodiment, when the existing 160 MHz phase rotation is repeated taking into account all preamble puncturing patterns, rather than limited preamble puncturing, and PPDUs are transmitted to RFs with various capabilities by taking into account additional phase rotation in 160 MHz increments, the max PAPR values ​​for L-STF / L-LTF are as shown in Table 11.

[0386] [Table 11]

[0387] Comparing Table 10 and Table 11, it can be seen that the phase rotation value of this embodiment defined in the 320 MHz band considering limited preamble puncturing patterns has a lower PAPR than the phase rotation value defined in the 320 MHz band considering all preamble puncturing patterns. The phase rotation value proposed in this embodiment has the novel effect of ensuring improved performance in the 320 MHz band without complex implementation.

[0388] 4.1.3.Additional phase rotation in 80MHz increments

[0389] To further reduce the PAPR, additional phase rotation values ​​can be multiplied in 80 MHz increments. <abcd>means the phase rotation that is further multiplied in 80MHz units. That is, a is the phase rotation that is further multiplied by the subcarrier of -512 to -257, b is the phase rotation that is further multiplied by the subcarrier of -256 to -1, c is the phase rotation that is further multiplied by the subcarrier of 0 to 255, and d is the phase rotation that is further multiplied by the above repeated phase rotation to form a new phase rotation value.

[0390] 4.1.3.A.320MHz RF capability consideration

[0391] The additional phase rotation that minimizes the L-STF / L-LTF PAPR is <1 1 -1 -1>, and the phase rotation per 20 MHz can be expressed as shown in Table 12.

[0392] [1 -1 -1 -1 1 -1 -1 -1 -1 1 1 1 1 -1 1 1 1]

[0393] The same PAPR can be obtained by adding the whole and multiplying it by a specific value.

[0394] [Table 12]

[0395] 4.1.3.B.160 / 320MHz RF capability consideration

[0396] The optimal phase rotation and PAPR are the same as those in Table 12.

[0397] 4.1.3.C.80 / 160 / 320MHz RF capability consideration

[0398] The optimal phase rotation and PAPR are the same as those in Table 12.

[0399] The above results remain the same even if the following preamble puncturing is further taken into consideration:

[0400] [OOXX XXOO OOOO OOOO]

[0401] [OOOO OOXX XXOO OOOO]

[0402] [OOOO OOOO OOXX XXOO]

[0403] Considering the situation where PPDUs are transmitted using one RF with a 320 MHz capacity, the additional phase rotation method in 4.1.3.80 MHz units, which has a relatively small PAPR, is preferred.

[0404] 4.2.240 / 80+160 / 160+80MHz

[0405] 4.2.1.320MHz or 160+160MHz phase rotation with 80MHz puncturing

[0406] 240MHz can be considered as 80MHz puncturing of 320MHz, so there is no need to design a separate phase rotation for 240MHz, and it can be used as a single phase rotation with 320MHz. For example, if a phase rotation of [1 -1 -1 -1 1 -1 -1 -1 -1 1 1 1 1 1] is used for 320MHz, and the first 80MHz is punctured and used for 240MHz transmission, the following phase rotation value is applied to 240MHz:

[0407] [1 -1 -1 -1 -1 1 1 1 -1 1 1 1]

[0408] If the second 80 MHz of the 320 MHz is punctured, the next phase rotation value is applied to 240 MHz.

[0409] [1 -1 -1 -1 -1 1 1 1 -1 1 1 1]

[0410] If the third 80MHz of the 320MHz is punctured, the next phase rotation value is applied to 240MHz.

[0411] [1 -1 -1 -1 1 -1 -1 -1 -1 1 1 1 1]

[0412] If the fourth 80MHz of the 320MHz is punctured, the next phase rotation value is applied to 240MHz.

[0413] [1 -1 -1 -1 1 -1 -1 -1 -1 1 1 1 1]

[0414] Below, we propose an additional 240MHz phase rotation.

[0415] Phase rotation is proposed based on the contiguous 240MHz, and phase rotation for non-contiguous 80+160 / 160+80MHz is proposed as follows: The phase rotation of the 80 / 160MHz portion corresponding to the low frequency of the contiguous 240MHz is directly applied to the phase rotation of the 80 / 160MHz portion corresponding to the low frequency of the non-contiguous 80+160 / 160+80MHz, and the phase rotation of the 160 / 80MHz portion corresponding to the high frequency of the contiguous 240MHz is directly applied to the phase rotation of the 160 / 80MHz portion corresponding to the high frequency of the non-contiguous 80+160 / 160+80MHz.

[0416] The subcarrier index of the contiguous 240MHz is -384 to 383, and the various phase rotation values ​​proposed below have the following form:

[0417] [abcdefghijkl]

[0418] This means that the phase rotation is applied to each 20MHz from the low frequency 20MHz to the high frequency 20MHz, i.e., a is -384 to -321, b is -320 to -257, c is -256 to -193, d is -192 to -129, e is -128 to -65, f is -64 to -1, g is 0 to 63, h is 64 to 127, i is 128 to 191, j is 192 to 255, k is 256 to 319, and l is 320 to 383.

[0419] Also, at 240 MHz, in addition to full band allocation, limited preamble puncturing is considered as follows:

[0420] Full band allocation:[OOOO OOOO OOOO]

[0421] Preamble puncturing:

[0422] [XXOO OOOO OOOO]

[0423] [OOXX OOOO OOOO]

[0424] [OOOO XXOO OOOO]

[0425] [OOOO OOXX OOOO]

[0426] [OOOO OOOO XXOO]

[0427] [OOOO OOOO OOXX]

[0428] [XXXX OOOO OOOO]

[0429] [OOOO XXXX OOOO]

[0430] [OOOO OOOO XXXX]

[0431] In the above, O or X means that a particular 20MHz channel is punctured or not punctured, and the frequencies are listed in order from the lowest 20MHz channel to the highest 20MHz channel.

[0432] The PAPR calculations used L-STF and L-LTF and assumed a 4x IFFT / IDFT (eg, an IFFT / IDFT based on a subcarrier spacing of 78.125 kHz).

[0433] 4.2.2. Existing 80MHz phase rotation repetition

[0434] By simply repeating the existing 80MHz phase rotation three times [1 -1 -1 -1 1 -1 -1 -1 1 -1 -1 -1], and considering the following various cases, the PAPR of L-STF and L-LTF can be calculated. Since this is simply an extension of the existing method and is the same for all 80MHz units, additional implementation may not be necessary. In other words, there is an implementation benefit when transmitting a 240MHz PPDU using some 80MHz capacity RF and 160MHz capacity RF.

[0435] In the following, the maximum transmittable RF capacity is considered to be 320MHz, and the 240MHz capacity is not considered. This is to avoid the additional IFFT implementation for 240MHz, which is beneficial in implementation.

[0436] 4.2.2.A.320MHz RF capability consideration

[0437] PPDU can be transmitted over one 320MHz capa RF. In this case, the max PAPR value for L-STF / L-LTF is as shown in Table 13.

[0438] [Table 13]

[0439] 4.2.2.B.80 / 160 / 320MHz RF capability consideration

[0440] PPDUs can be transmitted to three 80MHz capa RFs, or one 80MHz capa RF and one 160MHz capa RF, or one 320MHz capa RF. In this case, the max PAPR values ​​for L-STF / L-LTF are the same as those in Table 13.

[0441] In this embodiment, when PPDUs are transmitted to RFs with various capabilities by repeating the existing 80 MHz phase rotation while considering all preamble puncturing patterns, rather than limited preamble puncturing, the max PAPR values ​​for L-STF / L-LTF are as shown in Table 14.

[0442] [Table 14]

[0443] Comparing Table 13 with Table 14, it can be seen that the phase rotation value of this embodiment defined in the 240 MHz band considering limited preamble puncturing patterns has a lower PAPR than the phase rotation value defined in the 240 MHz band considering all preamble puncturing patterns. The phase rotation value proposed in this embodiment has the novel effect of ensuring improved performance in the 240 MHz band without complex implementation.

[0444] 4.2.3.Additional phase rotation in 80MHz increments

[0445] To further reduce the PAPR, additional phase rotation values ​​can be multiplied in 80 MHz increments. means the phase rotation that is further multiplied in 80MHz units. That is, a is the phase rotation that is further multiplied by the subcarrier of -384 to -129, b is the phase rotation that is further multiplied by the subcarrier of -128 to 127, and c is the phase rotation that is further multiplied by the above repeated phase rotation to form a new phase rotation value.

[0446] 4.2.3.A.320MHz RF capability consideration

[0447] The additional phase rotation that minimizes the L-STF / L-LTF PAPR is <1 - 1 -1>, <1 j 1>, or <1 -j 1>, and the phase rotation per 20 MHz can be expressed as shown in Table 15.

[0448] [1 -1 -1 -1 -1 1 1 1 1 -1 1 1] or [1 -1 -1 -1 j -j -j -j 1 -1 -1 -1] or [1 -1 -1 -1 -jjjj 1 -1 -1 -1]

[0449] The same PAPR can be obtained by adding the whole and multiplying it by a specific value.

[0450] [Table 15]

[0451] Furthermore, the additional phase rotation that minimizes the L-LTF PAPR is <1 1 -1>, and the phase rotation per 20 MHz can be expressed as shown in Table 16.

[0452] [1 -1 -1 -1 1 -1 -1 -1 -1 1 1 1 1]

[0453] [Table 16]

[0454] 4.2.3.B.80 / 160 / 320MHz RF capability consideration

[0455] The optimal phase rotation and PAPR are the same as in 4.2.3.A.

[0456] In this embodiment, when the existing 80 MHz phase rotation is repeated taking into account all preamble puncturing patterns, rather than limited preamble puncturing, and PPDUs are transmitted to RFs with various capabilities by taking into account additional phase rotation in 80 MHz increments, the max PAPR values ​​for L-STF / L-LTF are as shown in Table 17.

[0457] [Table 17]

[0458] Comparing Tables 15 and 16 with Table 17, it can be seen that the phase rotation value of this embodiment defined in the 240 MHz band considering limited preamble puncturing patterns has a lower PAPR than the phase rotation value defined in the 240 MHz band considering all preamble puncturing patterns. The phase rotation value proposed in this embodiment has the novel effect of ensuring improved performance in the 240 MHz band without complex implementation.

[0459] The above results remain the same even if the following preamble puncturing is further taken into consideration:

[0460] [OOXX XXOO OOOO]

[0461] [OOOO OOXX XXOO]

[0462] When 240MHz phase rotation is configured by puncturing 320MHz, method 4.2.1 is preferred, which can achieve implementation benefits for unified phase rotation with 320MHz. Also, method 4.2.3 may be preferred when considering PAPR, various RF capacities, and some preamble puncturing situations, but additional implementation overhead occurs because different phase rotations every 80MHz may be applied.

[0463] FIG. 22 is a procedure flow diagram showing the operation of the transmitting device according to this embodiment.

[0464] The phase rotation described above is applied according to the example in FIG.

[0465] The example in Figure 22 is executed in a transmitting device (AP and / or non-AP STA). Some of the steps (or sub-steps detailed below) in the example in Figure 22 may be omitted or modified.

[0466] In step S2210, the transmitting device may obtain control information for the STF sequence. For example, the transmitting device may obtain information regarding a bandwidth (e.g., 80 / 160 / 240 / 320 MHz) applied to the STF sequence. Additionally or alternatively, the transmitting device may obtain information regarding characteristics applied to the STF sequence (e.g., information instructing the generation of a 1x, 2x, or 4x sequence).

[0467] In step S2220, the transmitting device may configure or generate a control signal / field (e.g., EHTSTF signal / field) based on the acquired control information (e.g., information about bandwidth).

[0468] The step S2220 may include more specific sub-steps.

[0469] For example, step S2220 may further include selecting one STF sequence from among multiple STF sequences based on the control information obtained through S2210.

[0470] Additionally or alternatively, step S2220 may further include the step of performing power boosting.

[0471] Step S2220 can also be called a step for generating a sequence.

[0472] In step S2230, the transmitting device can transmit the signal / field / sequence configured through step S2220 to the receiving device based on step S2230.

[0473] The step S2220 may include more specific sub-steps.

[0474] For example, the transmitting device may perform a phase rotation step. Specifically, the transmitting device may perform a phase rotation step in units of 20 MHz*N (N=integer) on the sequence generated through step S2220.

[0475] Additionally or alternatively, the transmitter may perform at least one of the following operations: CSD, spatial mapping, IDFT / IFFT operation, GI insertion, etc.

[0476] The signals / fields / sequences constructed according to this specification are transmitted in the form of FIG.

[0477] The phase rotation described above is applied based on the device of FIG.

[0478] The example in FIG. 22 relates to an example of a transmitting device (AP and / or non-AP STA).

[0479] As shown in FIG. 1, the transmitting device may include a memory 112, a processor 111, and a transceiver 113.

[0480] The memory 112 may store information for multiple STF sequences as described herein, and may also store control information for STF sequence / PPDU generation.

[0481] The processor 111 can generate various sequences (e.g., STF sequences) and configure a PPDU based on the information stored in the memory 112. An example of a PPDU generated by the processor 111 is shown in FIG.

[0482] The processor 111 may perform some of the operations shown in Figure 22. For example, it may obtain control information for generating an STF sequence and configure the STF sequence.

[0483] For example, the processor 111 may include additional detailed units, which are configured as shown in Figure 21. That is, as shown, the processor 111 may perform operations such as CSD, spatial mapping, IDFT / IFFT operations, and GI insertion.

[0484] The illustrated transceiver 113 includes an antenna and is capable of performing analog signal processing. Specifically, the processor 111 controls the transceiver 113 and is capable of transmitting PPDUs generated by the processor 111.

[0485] FIG. 23 is a procedure flow diagram showing the operation of the receiving device according to this embodiment.

[0486] The phase rotation described above is applied by the example in FIG.

[0487] The example of FIG. 23 is performed in a receiving device (AP and / or non-AP STA).

[0488] The example of Fig. 23 is executed in a receiving STA or receiving device (AP and / or non-AP STA). Some of the steps (or sub-steps detailed below) of the example of Fig. 23 are omitted.

[0489] In step S2310, the receiving device can receive a signal / field including an STF sequence (i.e., an EHTSTF / EHTS sequence) via step S2310. The received signal has the form shown in FIG.

[0490] The sub-steps of step S2310 are determined based on step S2230, i.e., step S2310 may perform operations to restore the results of the phase rotation CSD, spatial mapping, IDFT / IFFT operations, and GI insertion operations applied in step S2230.

[0491] In step S2310, the STF sequence can perform various functions such as finding the time / frequency synchronization of the signal or estimating the AGC gain.

[0492] In step S2320, the receiving device can perform decoding on the received signal based on the STF sequence.

[0493] For example, step S2320 may include decoding a data field of a PPDU including an STF sequence, i.e., the receiving device may decode a signal included in the data field of a successfully received PPDU based on the STF sequence.

[0494] In step S2330, the receiving device can process the data decoded through step S2320.

[0495] For example, the receiving device may perform a processing operation of transmitting the decoded data to a higher layer (e.g., MAC layer) via step S2320, and may perform subsequent operations if the higher layer instructs the PHY layer to generate a signal corresponding to the data transmitted to the higher layer.

[0496] The phase rotation described above is applied based on the device of FIG.

[0497] The example in FIG. 23 relates to an example of a transmitting device (AP and / or non-AP STA).

[0498] As shown in FIG. 1, the transmitting device may include a memory 112, a processor 111, and a transceiver 113.

[0499] The memory 112 may store information for multiple STF sequences as described herein, and may also store control information for STF sequence / PPDU generation.

[0500] The processor 111 can generate various sequences (e.g., STF sequences) and configure a PPDU based on the information stored in the memory 112. An example of a PPDU generated by the processor 111 is shown in FIG.

[0501] The processor 111 may perform some of the operations shown in Figure 22. For example, it may obtain control information for generating an STF sequence and configure the STF sequence.

[0502] For example, the processor 111 may include additional detailed units, which are configured as shown in Figure 20. That is, as shown, the processor 111 may perform operations such as CSD, spatial mapping, IDFT / IFFT operations, and GI insertion.

[0503] The illustrated transceiver 113 includes an antenna and is capable of performing analog signal processing. Specifically, the processor 111 controls the transceiver 113 and is capable of transmitting PPDUs generated by the processor 111.

[0504] 21 are implemented by the transceiver 113. Specifically, the analog RF processing shown is included in the transceiver 113.

[0505] The above-mentioned embodiments will be described below with reference to FIGS.

[0506] FIG. 24 is a flowchart showing a procedure for a transmitting STA to transmit a PPDU according to this embodiment.

[0507] The example of Figure 24 is executed in a network environment that supports a next-generation WLAN system (IEEE 802.11be or EHT WLAN system), which is an improved WLAN system of the 802.11ax system and can satisfy backward compatibility with the 802.11ax system.

[0508] The example of Figure 24 is performed in a transmitting STA, which may correspond to an AP (access point). The receiving STA of Figure 24 may correspond to a STA supporting an EHT (Extremely High Throughput) wireless LAN system.

[0509] This embodiment proposes a method and apparatus for setting a phase rotation value to be applied to a legacy preamble for optimized PAPR in L-STF or L-LTF, taking into account limited preamble puncturing when transmitting a PPDU over a wideband (240 MHz or 320 MHz).

[0510] In step S2410, a transmitting station (STA) generates a PPDU (Physical Protocol Data Unit).

[0511] In step S2420, the transmitting STA transmits the PPDU to the receiving STA via a broadband.

[0512] The PPDU includes a legacy preamble, first and second signal fields. The legacy preamble may include a Legacy-Short Training Field (L-STF) and a Legacy-Long Training Field (L-LTF). The first signal field is a Universal-Signal (U-SIG), and the second signal field is an Extremely High Throughput-Signal (EHT-SIG). The PPDU may further include an EHT-STF, an EHT-LTF, and a data field.

[0513] The legacy preamble, the first signal field, and the second signal field are generated based on a first phase rotation value, i.e., a phase rotation is applied from the legacy preamble to the EHT-SIG.

[0514] The first phase rotation value is obtained based on a first preamble puncturing pattern of the wideband. If the wideband is a 320 MHz or 160+160 MHz band, the first preamble puncturing pattern includes a pattern in which a 40 MHz or 80 MHz band is punctured in the wideband. The first phase rotation value is [1 -1 -1 -1 1 -1 -1 -1 -1 1 1 1 1 1 1].

[0515] This embodiment proposes a method for obtaining a phase rotation value in consideration of the limited preamble puncturing of the first preamble puncturing pattern.

[0516] Since the wideband is a 320 MHz or 160+160 MHz band, the wideband may include first to fourth 80 MHz bands. The first to fourth 80 MHz bands are arranged consecutively from low to high frequency. The first preamble puncturing pattern may include first to eighth patterns.

[0517] As an example, the first pattern is a pattern in which a 40 MHz band within the first 80 MHz band is punctured in the wideband, the second pattern is a pattern in which a 40 MHz band within the second 80 MHz band is punctured in the wideband, the third pattern is a pattern in which a 40 MHz band within the third 80 MHz band is punctured in the wideband, and the fourth pattern is a pattern in which a 40 MHz band within the fourth 80 MHz band is punctured in the wideband.

[0518] The first to fourth patterns are patterns in which 40 MHz bands are punctured in the wideband, and the 40 MHz bands punctured in the first to fourth 80 MHz bands are the 40 MHz bands at both ends of each 80 MHz band, and may not be the 40 MHz band in the middle of each 80 MHz band.

[0519] The fifth pattern is a pattern in which the first 80 MHz band is punctured in the wideband, the sixth pattern is a pattern in which the second 80 MHz band is punctured in the wideband, the seventh pattern is a pattern in which the third 80 MHz band is punctured in the wideband, and the eighth pattern is a pattern in which the fourth 80 MHz band is punctured in the wideband.

[0520] The fifth to eighth patterns are patterns in which 80 MHz bands are punctured in the wideband, and the first to fourth 80 MHz bands themselves are punctured, and there are cases in which two or more 80 MHz bands are not partially punctured.

[0521] One element of the first phase rotation value is a phase rotation value applied to each 20 MHz band of the 320 MHz band or the 160+160 MHz band.

[0522] Specifically, the subcarrier range to which the phase rotation value is applied will be described.

[0523] The 320 MHz band or the 160+160 MHz band is composed of subcarriers with subcarrier indices ranging from −512 to 511. The first phase rotation value of 1 is applied to subcarriers with subcarrier indices ranging from −512 to −449, the second first phase rotation value of −1 is applied to subcarriers with subcarrier indices ranging from −448 to −385, the third first phase rotation value of −1 is applied to subcarriers with subcarrier indices ranging from −384 to −321, and the fourth first phase rotation value of −1 is applied to subcarriers with subcarrier indices ranging from −320 to −257.

[0524] The fifth of the first phase rotation values, 1, is applied to subcarriers with subcarrier indexes from -256 to -193, the sixth of the first phase rotation values, -1, is applied to subcarriers with subcarrier indexes from -192 to -129, the seventh of the first phase rotation values, -1, is applied to subcarriers with subcarrier indexes from -128 to -65, and the eighth of the first phase rotation values, -1, is applied to subcarriers with subcarrier indexes from -64 to -1.

[0525] The ninth of the first phase rotation values, −1, is applied to subcarriers with subcarrier indexes from 0 to 63, the tenth of the first phase rotation values, 1, is applied to subcarriers with subcarrier indexes from 64 to 127, the eleventh of the first phase rotation values, 1, is applied to subcarriers with subcarrier indexes from 128 to 191, and the twelfth of the first phase rotation values, 1, is applied to subcarriers with subcarrier indexes from 192 to 255.

[0526] The 13th of the first phase rotation values, −1, is applied to subcarriers with subcarrier indexes from 256 to 319, the 14th of the first phase rotation values, 1, is applied to subcarriers with subcarrier indexes from 320 to 383, the 15th of the first phase rotation values, 1, is applied to subcarriers with subcarrier indexes from 384 to 447, and the 16th of the first phase rotation values, 1, is applied to subcarriers with subcarrier indexes from 448 to 511.

[0527] The legacy preamble may include a Legacy-Short Training Field (L-STF) and a Legacy-Long Training Field (L-LTF).

[0528] The first phase rotation value is generated based on the second and third phase rotation values. The second phase rotation value is a phase rotation value obtained by repeating a phase rotation value for the 80 MHz band defined in the 802.11ax WLAN system. For example, the second phase rotation value is [1 -1 -1 -1 1 -1 -1 -1 1 -1 -1 -1 1 -1 -1 -1] ([1 -1 -1 -1] is repeated four times).

[0529] The third phase rotation value is a phase rotation value defined in 80 MHz band units to obtain the optimal PAPR (Peak-to-Average Power Ratio) of the L-STF and the L-LTF. The optimal PAPR of the L-STF and the L-LTF is obtained based on the combination of RFs (Radio Frequencies) used when transmitting the PPDU. The RF combination is a combination of RFs (Radio Frequencies) with 160 MHz capability or a combination of RFs with 320 MHz capability. For example, the third phase rotation value is [1 1 -1 -1].

[0530] This embodiment proposes a method of repeatedly applying a phase rotation value (second phase rotation value) for the 80 MHz band defined in the 802.11ax wireless LAN system, and performing additional phase rotation (third phase rotation value) in 80 MHz units.

[0531] Specifically, the first phase rotation value is obtained based on the product of the second phase rotation value and the third phase rotation value. The first of the third phase rotation values ​​(1) is applied to the first 80 MHz band, the second of the third phase rotation values ​​(1) is applied to the second 80 MHz band, the third of the third phase rotation values ​​(-1) is applied to the third 80 MHz band, and the fourth of the third phase rotation values ​​(-1) is applied to the fourth 80 MHz band. That is, the first phase rotation value can be obtained by multiplying the second phase rotation value and the third phase rotation value according to the frequency band (or subcarrier index). Thus, the first phase rotation value is determined as [1 -1 -1 -1 1 -1 -1 -1 -1 1 1 1 1 -1 1 1 1]. By applying the first phase rotation value to the legacy preamble and the first and second signal fields, optimal PAPR for the L-STF and the L-LTF can be ensured for wideband transmission.

[0532] In the above-described embodiment, phase rotation values ​​are defined and applied to the legacy preamble and the first and second signal fields in the same manner when the PPDU is transmitted through the 240 MHz / 160+80 MHz / 80+160 MHz bands. However, the 240 MHz / 160+80 MHz / 80+160 MHz bands are determined as bands obtained by performing 80 MHz-based preamble puncturing on the 320 MHz / 160+160 MHz band, and separate phase rotation values ​​are not defined for the 240 MHz / 160+80 MHz / 80+160 MHz bands, but the phase rotation values ​​defined in the 320 MHz / 160+160 MHz bands can be unified and used (unified technology).

[0533] For example, if the phase rotation value (first phase rotation value) for the 320 MHz / 160+160 MHz band is [1 -1 -1 -1 -1 -1 -1 -1 -1 1 1 1 1 1], the phase rotation value for the 240 MHz / 160+80 MHz / 80+160 MHz band is determined by the 80 MHz band to be punctured. If the first 80 MHz of the 320 MHz / 160+160 MHz is punctured, the phase rotation value for the 240 MHz / 160+80 MHz / 80+160 MHz band is [1 -1 -1 -1 -1 1 1 1 1 1]. When the second 80 MHz of the 320 MHz / 160+160 MHz is punctured, the phase rotation value for the 240 MHz / 160+80 MHz / 80+160 MHz band is [1 -1 -1 -1 -1 -1 1 1 1 1 1]. When the third 80 MHz of the 320 MHz / 160+160 MHz is punctured, the phase rotation value for the 240 MHz / 160+80 MHz / 80+160 MHz band is [1 -1 -1 -1 -1 -1 -1 -1 -1 1 1 1]. When the fourth 80 MHz of the 320 MHz / 160+160 MHz is punctured, the phase rotation value for the 240 MHz / 160+80 MHz / 80+160 MHz band is [1 -1 -1 -1 -1 -1 -1 -1 1 1 1].

[0534] The first signal field may include information about the first preamble puncturing pattern (or punctured channel information). The first signal field may further include information about bandwidth, PPDU type, and compression mode. The second signal field may include resource unit (RU) information. A transmitting STA may notify information about a tone plan at 160 / 240 / 320 MHz via the first and second signal fields. The EHT-STF, EHT-LTF, and data fields are transmitted and received in a band (or RU) included in a wideband tone plan.

[0535] FIG. 25 is a flowchart showing a procedure for a receiving STA to receive a PPDU according to this embodiment.

[0536] The example of Figure 25 is executed in a network environment that supports a next-generation WLAN system (IEEE 802.11be or EHT WLAN system), which is an improved WLAN system of the 802.11ax system and can satisfy backward compatibility with the 802.11ax system.

[0537] The example of Figure 25 is executed in a receiving STA and may correspond to a STA supporting an EHT (Extremely High Throughput) wireless LAN system. The transmitting STA of Figure 25 may correspond to an AP (access point).

[0538] This embodiment proposes a method and apparatus for setting a phase rotation value to be applied to a legacy preamble for optimized PAPR in L-STF or L-LTF, taking into account limited preamble puncturing when transmitting a PPDU over a wideband (240 MHz or 320 MHz).

[0539] In step S2510, a receiving station (STA) receives a physical protocol data unit (PPDU) from a transmitting station via a broadband.

[0540] In step S2520, the receiving STA decodes the PPDU.

[0541] The PPDU includes a legacy preamble, first and second signal fields. The legacy preamble may include a Legacy-Short Training Field (L-STF) and a Legacy-Long Training Field (L-LTF). The first signal field is a Universal-Signal (U-SIG), and the second signal field is an Extremely High Throughput-Signal (EHT-SIG). The PPDU may further include an EHT-STF, an EHT-LTF, and a data field.

[0542] The legacy preamble, the first signal field, and the second signal field are generated based on a first phase rotation value, i.e., a phase rotation is applied from the legacy preamble to the EHT-SIG.

[0543] The first phase rotation value is obtained based on a first preamble puncturing pattern of the wideband. If the wideband is a 320 MHz or 160+160 MHz band, the first preamble puncturing pattern includes a pattern in which a 40 MHz or 80 MHz band is punctured in the wideband. The first phase rotation value is [1 -1 -1 -1 1 -1 -1 -1 -1 1 1 1 1 1 1].

[0544] This embodiment proposes a method for obtaining a phase rotation value in consideration of the limited preamble puncturing of the first preamble puncturing pattern.

[0545] Since the wideband is a 320 MHz or 160+160 MHz band, the wideband may include first to fourth 80 MHz bands. The first to fourth 80 MHz bands are arranged consecutively from low to high frequency. The first preamble puncturing pattern may include first to eighth patterns.

[0546] As an example, the first pattern is a pattern in which a 40 MHz band within the first 80 MHz band is punctured in the wideband, the second pattern is a pattern in which a 40 MHz band within the second 80 MHz band is punctured in the wideband, the third pattern is a pattern in which a 40 MHz band within the third 80 MHz band is punctured in the wideband, and the fourth pattern is a pattern in which a 40 MHz band within the fourth 80 MHz band is punctured in the wideband.

[0547] The first to fourth patterns are patterns in which 40 MHz bands are punctured in the wideband, and the 40 MHz bands punctured in the first to fourth 80 MHz bands are the 40 MHz bands at both ends of each 80 MHz band, and may not be the 40 MHz band in the middle of each 80 MHz band.

[0548] The fifth pattern is a pattern in which the first 80 MHz band is punctured in the wideband, the sixth pattern is a pattern in which the second 80 MHz band is punctured in the wideband, the seventh pattern is a pattern in which the third 80 MHz band is punctured in the wideband, and the eighth pattern is a pattern in which the fourth 80 MHz band is punctured in the wideband.

[0549] The fifth to eighth patterns are patterns in which 80 MHz bands are punctured in the wideband, and the first to fourth 80 MHz bands themselves are punctured, and there are cases in which two or more 80 MHz bands are not partially punctured.

[0550] One element of the first phase rotation value is a phase rotation value applied to each 20 MHz band of the 320 MHz band or the 160+160 MHz band.

[0551] Specifically, the subcarrier range to which the phase rotation value is applied will be described.

[0552] The 320 MHz band or the 160+160 MHz band is composed of subcarriers with subcarrier indices ranging from −512 to 511. The first phase rotation value of 1 is applied to subcarriers with subcarrier indices ranging from −512 to −449, the second first phase rotation value of −1 is applied to subcarriers with subcarrier indices ranging from −448 to −385, the third first phase rotation value of −1 is applied to subcarriers with subcarrier indices ranging from −384 to −321, and the fourth first phase rotation value of −1 is applied to subcarriers with subcarrier indices ranging from −320 to −257.

[0553] The fifth of the first phase rotation values, 1, is applied to subcarriers with subcarrier indexes from -256 to -193, the sixth of the first phase rotation values, -1, is applied to subcarriers with subcarrier indexes from -192 to -129, the seventh of the first phase rotation values, -1, is applied to subcarriers with subcarrier indexes from -128 to -65, and the eighth of the first phase rotation values, -1, is applied to subcarriers with subcarrier indexes from -64 to -1.

[0554] The ninth of the first phase rotation values, −1, is applied to subcarriers with subcarrier indexes from 0 to 63, the tenth of the first phase rotation values, 1, is applied to subcarriers with subcarrier indexes from 64 to 127, the eleventh of the first phase rotation values, 1, is applied to subcarriers with subcarrier indexes from 128 to 191, and the twelfth of the first phase rotation values, 1, is applied to subcarriers with subcarrier indexes from 192 to 255.

[0555] The 13th of the first phase rotation values, −1, is applied to subcarriers with subcarrier indexes from 256 to 319, the 14th of the first phase rotation values, 1, is applied to subcarriers with subcarrier indexes from 320 to 383, the 15th of the first phase rotation values, 1, is applied to subcarriers with subcarrier indexes from 384 to 447, and the 16th of the first phase rotation values, 1, is applied to subcarriers with subcarrier indexes from 448 to 511.

[0556] The legacy preamble may include a Legacy-Short Training Field (L-STF) and a Legacy-Long Training Field (L-LTF).

[0557] The first phase rotation value is generated based on the second and third phase rotation values. The second phase rotation value is a phase rotation value obtained by repeating a phase rotation value for the 80 MHz band defined in the 802.11ax WLAN system. For example, the second phase rotation value is [1 -1 -1 -1 1 -1 -1 -1 1 -1 -1 -1 1 -1 -1 -1] ([1 -1 -1 -1] is repeated four times).

[0558] The third phase rotation value is a phase rotation value defined in 80 MHz band units to obtain the optimal PAPR (Peak-to-Average Power Ratio) of the L-STF and the L-LTF. The optimal PAPR of the L-STF and the L-LTF is obtained based on the combination of RFs (Radio Frequencies) used when transmitting the PPDU. The RF combination is a combination of RFs (Radio Frequencies) with 160 MHz capability or a combination of RFs with 320 MHz capability. For example, the third phase rotation value is [1 1 -1 -1].

[0559] This embodiment proposes a method of repeatedly applying a phase rotation value (second phase rotation value) for the 80 MHz band defined in the 802.11ax wireless LAN system, and performing additional phase rotation (third phase rotation value) in 80 MHz units.

[0560] Specifically, the first phase rotation value is obtained based on the product of the second phase rotation value and the third phase rotation value. The first of the third phase rotation values ​​(1) is applied to the first 80 MHz band, the second of the third phase rotation values ​​(1) is applied to the second 80 MHz band, the third of the third phase rotation values ​​(-1) is applied to the third 80 MHz band, and the fourth of the third phase rotation values ​​(-1) is applied to the fourth 80 MHz band. That is, the first phase rotation value can be obtained by multiplying the second phase rotation value and the third phase rotation value according to the frequency band (or subcarrier index). Thus, the first phase rotation value is determined as [1 -1 -1 -1 1 -1 -1 -1 -1 1 1 1 1 -1 1 1 1]. By applying the first phase rotation value to the legacy preamble and the first and second signal fields, optimal PAPR for the L-STF and the L-LTF can be ensured for wideband transmission.

[0561] In the above-described embodiment, phase rotation values ​​are defined and applied to the legacy preamble and the first and second signal fields in the same manner when the PPDU is transmitted through the 240 MHz / 160+80 MHz / 80+160 MHz bands. However, the 240 MHz / 160+80 MHz / 80+160 MHz bands are determined as bands obtained by performing 80 MHz-based preamble puncturing on the 320 MHz / 160+160 MHz band, and separate phase rotation values ​​are not defined for the 240 MHz / 160+80 MHz / 80+160 MHz bands, but the phase rotation values ​​defined in the 320 MHz / 160+160 MHz bands can be unified and used (unified technology).

[0562] For example, if the phase rotation value (first phase rotation value) for the 320 MHz / 160+160 MHz band is [1 -1 -1 -1 -1 -1 -1 -1 -1 1 1 1 1 1], the phase rotation value for the 240 MHz / 160+80 MHz / 80+160 MHz band is determined by the 80 MHz band to be punctured. If the first 80 MHz of the 320 MHz / 160+160 MHz is punctured, the phase rotation value for the 240 MHz / 160+80 MHz / 80+160 MHz band is [1 -1 -1 -1 -1 1 1 1 1 1]. When the second 80 MHz of the 320 MHz / 160+160 MHz is punctured, the phase rotation value for the 240 MHz / 160+80 MHz / 80+160 MHz band is [1 -1 -1 -1 -1 -1 1 1 1 1 1]. When the third 80 MHz of the 320 MHz / 160+160 MHz is punctured, the phase rotation value for the 240 MHz / 160+80 MHz / 80+160 MHz band is [1 -1 -1 -1 -1 -1 -1 -1 -1 1 1 1]. When the fourth 80 MHz of the 320 MHz / 160+160 MHz is punctured, the phase rotation value for the 240 MHz / 160+80 MHz / 80+160 MHz band is [1 -1 -1 -1 -1 -1 -1 -1 1 1 1].

[0563] The first signal field may include information about the first preamble puncturing pattern (or punctured channel information). The first signal field may further include information about bandwidth, PPDU type, and compression mode. The second signal field may include resource unit (RU) information. A transmitting STA may notify information about a tone plan at 160 / 240 / 320 MHz via the first and second signal fields. The EHT-STF, EHT-LTF, and data fields are transmitted and received in a band (or RU) included in a wideband tone plan.

[0564] 5.Device configuration

[0565] The technical features of the present specification described above may be applied to various devices and methods. For example, the technical features of the present specification described above may be performed / supported by the device of FIG. 1 and / or FIG. 19. For example, the technical features of the present specification described above may be applied to only a part of FIG. 1 and / or FIG. 19. For example, the technical features of the present specification described above may be implemented based on the processing chips 114 and 124 of FIG. 1, the processors 111 and 121 and memories 112 and 122 of FIG. 1, or the processor 610 and memory 620 of FIG. 19. For example, the device described herein may receive a Physical Protocol Data Unit (PPDU) from a transmitting STA via a wideband signal and decode the PPDU.

[0566] The technical features of this specification are implemented based on a CRM (computer readable medium). For example, the CRM proposed by this specification is at least one computer readable medium including instructions to be executed by at least one processor.

[0567] The CRM may store instructions for performing operations including receiving a Physical Protocol Data Unit (PPDU) from a transmitting STA via a broadband and decoding the PPDU. The instructions stored in the CRM herein are executed by at least one processor. The at least one processor associated with the CRM herein is processor 111 or 121 or processing chip 114 or 124 in FIG. 1, or processor 610 in FIG. 19. Meanwhile, the CRM herein may be memory 112 or 122 in FIG. 1, memory 620 in FIG. 19, or a separate external memory / storage medium / disk.

[0568] 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).

[0569] Artificial intelligence refers to the field that studies artificial intelligence or the methodologies for creating it, while machine learning refers to the field that defines various problems to be dealt with in the field of artificial intelligence and studies the methodologies for solving them. Machine learning can also be defined as an algorithm that improves its performance for a certain task through continuous experience with that task.

[0570] An artificial neural network (ANN) is a model used in machine learning that is composed of artificial neurons (nodes) that form a network of synaptic connections and has problem-solving capabilities. An artificial neural network is defined by the connection patterns between neurons in different layers, a learning process that updates the model parameters, and an activation function that generates output values.

[0571] An artificial neural network can include an input layer, an output layer, and optionally one or more hidden layers. Each layer contains one or more neurons, and an artificial neural network can include synapses connecting neurons. In an artificial neural network, each neuron can output a function value of an activation function in response to input signals, weights, and biases received via synapses.

[0572] Model parameters are parameters determined through learning, such as synaptic connection weights and neuron biases, while hyperparameters are parameters that must be set before learning in machine learning algorithms, such as the learning rate, number of iterations, mini-batch size, and initialization function.

[0573] The goal of training an artificial neural network is to determine the model parameters that minimize the loss function, which is used as an index to determine the optimal model parameters in the training process of the artificial neural network.

[0574] Depending on the learning method, machine learning can be classified as supervised learning, unsupervised learning, and reinforcement learning.

[0575] Supervised learning is a method of training an artificial neural network when labels for training data are given, and refers to the correct answer (or resulting value) that the artificial neural network needs to infer when training data called labels are input to the artificial neural network. Unsupervised learning is a method of training an artificial neural network when labels for training data are not given. Reinforcement learning is a learning method that trains an agent defined in an environment to select actions or action sequences that maximize cumulative rewards in each state.

[0576] Among artificial neural networks, machine learning implemented as a deep neural network (DNN) with multiple hidden layers is also called deep learning, and deep learning is a part of machine learning. In the following, machine learning will be used to include deep learning.

[0577] The above-mentioned technical features are also applicable to wireless communication of robots.

[0578] A robot is a machine that automatically processes or operates a given task using its own capabilities. In particular, a robot that has the ability to recognize its environment, make its own decisions, and execute its actions is called an intelligent robot.

[0579] Robots can be classified according to their intended use and field, such as industrial, medical, domestic, and military. Robots have drive units including actuators or motors, allowing them to perform various physical actions such as moving robot joints. Mobile robots also have drive units including wheels, brakes, and propellers, allowing them to move on the ground or fly in the air.

[0580] The technical features described above also apply to devices that support augmented reality.

[0581] Augmented reality is a general 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 top of images of real objects, and MR technology is a computer graphics technology that mixes and combines virtual objects into the real world.

[0582] MR technology is similar to AR technology in that it displays virtual objects together, but the difference is that in AR technology, virtual objects are used to complement each other, while in MR technology, virtual objects are used with equal characteristics.

[0583] XR technology is applied to HMDs (Head-Mount Displays), HUDs (Head-Up Displays), mobile phones, tablet PCs, laptops, desktops, TVs, digital signage, etc., and devices to which XR technology is applied can be called XR devices.

[0584] The claims described herein may be combined in various ways, for example, the technical features of the method claims herein may be combined and implemented in an apparatus, the technical features of the device claims herein may be combined and implemented in a method, the technical features of the method claims herein may be combined with the technical features of the device claims herein may be combined and implemented in an apparatus, and the technical features of the method claims herein may be combined with the technical features of the device claims herein may be combined and implemented in a method. < / abcd>

Claims

1. 1. A method in a wireless local area network (WLAN) system, comprising: A receiving station (STA) receives a physical protocol data unit (PPDU) from a transmitting station via a broadband; the receiving STA decoding the PPDU; The PPDU includes an L-STF (Legacy-Short Training Field), an L-LTF (Legacy-Long Training Field), an L-SIG (Legacy-Signal), an RL-SIG (Repeated Legacy-Signal), an U-SIG (Universal-Signal), an EHT-SIG (Extremely High Throughput-Signal), an EHT-STF, an EHT-LTF, and a data field; When the wideband is a 320 MHz band, the first preamble puncturing pattern includes a pattern in which a 40 MHz or 80 MHz band is punctured in the wideband; a first phase rotation value is applied to the L-STF, the L-LTF, the L-SIG, the RL-SIG, the U-SIG, and the EHT-SIG; The method of claim 1, wherein the first phase rotation value is [1 −1 −1 −1 1 −1 −1 −1 −1 1 1 1 1 −1 1 1 1].

2. the wide band includes first through fourth 80 MHz bands; the first preamble puncturing pattern includes first to eighth patterns; the first pattern is a pattern in which a 40 MHz band within the first 80 MHz band in the wide band is punctured; the second pattern is a pattern in which a 40 MHz band within the second 80 MHz band in the wide band is punctured, the third pattern is a pattern in which a 40 MHz band within the third 80 MHz band in the wide band is punctured, the fourth pattern is a pattern in which a 40 MHz band within the fourth 80 MHz band in the wide band is punctured, the fifth pattern is a pattern in which the first 80 MHz band is punctured in the wide band; the sixth pattern is a pattern in which the second 80 MHz band is punctured in the wide band, the seventh pattern is a pattern in which the third 80 MHz band is punctured in the wide band; The method of claim 1 , wherein the eighth pattern is a pattern in which the fourth 80 MHz band in the wideband is punctured.

3. one element of the first phase rotation value is a phase rotation value applied to each 20 MHz band of the 320 MHz band; the 320 MHz band is comprised of subcarriers having subcarrier indices ranging from −512 to 511; a first 1 of the first phase rotation value is applied to subcarriers having subcarrier indices from −512 to −449; a second −1 of the first phase rotation value is applied to subcarriers having subcarrier indices from −448 to −385; the third −1 of the first phase rotation value is applied to subcarriers having subcarrier indexes from −384 to −321; The fourth value of the first phase rotation value, −1, is applied to subcarriers having subcarrier indexes from −320 to −257; a fifth 1 in the first phase rotation value is applied to subcarriers having subcarrier indices from −256 to −193; The sixth value of −1 of the first phase rotation value is applied to subcarriers having subcarrier indexes from −192 to −129; the seventh −1 of the first phase rotation value is applied to subcarriers having subcarrier indices from −128 to −65; the eighth phase rotation value −1 is applied to subcarriers having subcarrier indices −64 to −1; The ninth value of the first phase rotation value, −1, is applied to subcarriers having subcarrier indexes from 0 to 63; a tenth 1 of the first phase rotation value is applied to subcarriers having subcarrier indices from 64 to 127; an 11th 1 of the first phase rotation value is applied to subcarriers having subcarrier indices from 128 to 191; the twelfth 1 of the first phase rotation value is applied to subcarriers having subcarrier indices from 192 to 255; a thirteenth value of −1 among the first phase rotation values ​​is applied to subcarriers having subcarrier indexes from 256 to 319; the 14th 1 of the first phase rotation value is applied to subcarriers having subcarrier indices from 320 to 383; the 15th 1 of the first phase rotation value is applied to subcarriers having subcarrier indices from 384 to 447; 2. The method of claim 1, wherein sixteenth ones of the first phase rotation value are applied to subcarriers having subcarrier indices from 448 to 511.

4. the first phase rotation value is generated based on the second phase rotation value and the third phase rotation value; the second phase rotation value is a phase rotation value obtained by repeating a phase rotation value for an 80 MHz band defined in an 802.11ax WLAN system; The method of claim 2, wherein the third phase rotation value is a phase rotation value defined in 80 MHz band units to obtain an optimal PAPR (Peak-to-Average Power Ratio) of the L-STF and the L-LTF.

5. the second phase rotation value is [1 −1 −1 −1 1 −1 −1 −1 1 −1 −1 −1 1 −1 −1 −1], the third phase rotation value is [1 1 −1 −1]; The method of claim 4 , wherein the first phase rotation value is obtained based on a product of the second phase rotation value and the third phase rotation value.

6. a first 1 of the third phase rotation values ​​is applied to the first 80 MHz band; a second 1 of the third phase rotation value is applied to the second 80 MHz band; a third −1 of the third phase rotation value is applied to the third 80 MHz band; The method of claim 5 , wherein a fourth −1 of the third phase rotation values ​​is applied to the fourth 80 MHz band.

7. The method of claim 1 , wherein the U-SIG includes information about the first preamble puncturing pattern.

8. A receiving station (STA) in a wireless local area network (WLAN) system, Memory and A transmitter / receiver, a processor operatively coupled to the memory and the transceiver; The processor: receiving a Physical Protocol Data Unit (PPDU) from a transmitting STA via broadband; configured to decode the PPDU; The PPDU includes an L-STF (Legacy-Short Training Field), an L-LTF (Legacy-Long Training Field), an L-SIG (Legacy-Signal), an RL-SIG (Repeated Legacy-Signal), an U-SIG (Universal-Signal), an EHT-SIG (Extremely High Throughput-Signal), an EHT-STF, an EHT-LTF, and a data field; When the wideband is a 320 MHz band, the first preamble puncturing pattern includes a pattern in which a 40 MHz or 80 MHz band is punctured in the wideband; a first phase rotation value is applied to the L-STF, the L-LTF, the L-SIG, the RL-SIG, the U-SIG, and the EHT-SIG; The receiving STA, wherein the first phase rotation value is [1 −1 −1 −1 1 −1 −1 −1 −1 1 1 1 1 −1 1 1 1].

9. 1. A method in a wireless local area network (WLAN) system, comprising: A transmitting station (STA) generates a physical protocol data unit (PPDU); The transmitting STA transmits the PPDU to a receiving STA via a broadband; The PPDU includes an L-STF (Legacy-Short Training Field), an L-LTF (Legacy-Long Training Field), an L-SIG (Legacy-Signal), an RL-SIG (Repeated Legacy-Signal), an U-SIG (Universal-Signal), an EHT-SIG (Extremely High Throughput-Signal), an EHT-STF, an EHT-LTF, and a data field; When the wideband is a 320 MHz band, the first preamble puncturing pattern includes a pattern in which a 40 MHz or 80 MHz band is punctured in the wideband; a first phase rotation value is applied to the L-STF, the L-LTF, the L-SIG, the RL-SIG, the U-SIG, and the EHT-SIG; The method of claim 1, wherein the first phase rotation value is [1 −1 −1 −1 1 −1 −1 −1 −1 1 1 1 1 −1 1 1 1].

10. the wide band includes first through fourth 80 MHz bands; the first preamble puncturing pattern includes first to eighth patterns; the first pattern is a pattern in which a 40 MHz band within the first 80 MHz band in the wide band is punctured; the second pattern is a pattern in which a 40 MHz band within the second 80 MHz band in the wide band is punctured, the third pattern is a pattern in which a 40 MHz band within the third 80 MHz band in the wide band is punctured, the fourth pattern is a pattern in which a 40 MHz band within the fourth 80 MHz band in the wide band is punctured, the fifth pattern is a pattern in which the first 80 MHz band is punctured in the wide band; the sixth pattern is a pattern in which the second 80 MHz band is punctured in the wide band, the seventh pattern is a pattern in which the third 80 MHz band is punctured in the wide band; The method of claim 9 , wherein the eighth pattern is a pattern in which the fourth 80 MHz band in the wideband is punctured.

11. one element of the first phase rotation value is a phase rotation value applied to each 20 MHz band of the 320 MHz band; the 320 MHz band is comprised of subcarriers having subcarrier indices ranging from −512 to 511; a first 1 of the first phase rotation value is applied to subcarriers having subcarrier indices from −512 to −449; a second −1 of the first phase rotation value is applied to subcarriers having subcarrier indices from −448 to −385; the third −1 of the first phase rotation value is applied to subcarriers having subcarrier indexes from −384 to −321; The fourth value of the first phase rotation value, −1, is applied to subcarriers having subcarrier indexes from −320 to −257; a fifth 1 in the first phase rotation value is applied to subcarriers having subcarrier indices from −256 to −193; The sixth value of −1 of the first phase rotation value is applied to subcarriers having subcarrier indexes from −192 to −129; the seventh −1 of the first phase rotation value is applied to subcarriers having subcarrier indices from −128 to −65; the eighth phase rotation value −1 is applied to subcarriers having subcarrier indices −64 to −1; The ninth value of the first phase rotation value, −1, is applied to subcarriers having subcarrier indexes from 0 to 63; a tenth 1 of the first phase rotation value is applied to subcarriers having subcarrier indices from 64 to 127; an 11th 1 of the first phase rotation value is applied to subcarriers having subcarrier indices from 128 to 191; the twelfth 1 of the first phase rotation value is applied to subcarriers having subcarrier indices from 192 to 255; a thirteenth value of −1 among the first phase rotation values ​​is applied to subcarriers having subcarrier indexes from 256 to 319; the 14th 1 of the first phase rotation value is applied to subcarriers having subcarrier indices from 320 to 383; the 15th 1 of the first phase rotation value is applied to subcarriers having subcarrier indices from 384 to 447; 10. The method of claim 9, wherein sixteenth ones of the first phase rotation value are applied to subcarriers having subcarrier indices from 448 to 511.

12. the first phase rotation value is generated based on the second phase rotation value and the third phase rotation value; the second phase rotation value is a phase rotation value obtained by repeating a phase rotation value for an 80 MHz band defined in an 802.11ax WLAN system; The method of claim 10, wherein the third phase rotation value is a phase rotation value defined in 80 MHz band units to obtain an optimal PAPR (Peak-to-Average Power Ratio) of the L-STF and the L-LTF.

13. the second phase rotation value is [1 −1 −1 −1 1 −1 −1 −1 1 −1 −1 −1 1 −1 −1 −1], the third phase rotation value is [1 1 −1 −1]; The method of claim 12 , wherein the first phase rotation value is obtained based on a product of the second phase rotation value and the third phase rotation value.

14. a first 1 of the third phase rotation values ​​is applied to the first 80 MHz band; a second 1 of the third phase rotation value is applied to the second 80 MHz band; a third −1 of the third phase rotation value is applied to the third 80 MHz band; 14. The method of claim 13, wherein a fourth −1 of the third phase rotation values ​​is applied to the fourth 80 MHz band.

15. The method of claim 9 , wherein the U-SIG includes information on the first preamble puncturing pattern.

16. A transmitting station (STA) in a wireless local area network (WLAN) system, Memory and A transmitter / receiver, a processor operatively coupled to the memory and the transceiver; The processor: Generate a PPDU (Physical Protocol Data Unit), configured to transmit the PPDU to a receiving STA via broadband; The PPDU includes an L-STF (Legacy-Short Training Field), an L-LTF (Legacy-Long Training Field), an L-SIG (Legacy-Signal), an RL-SIG (Repeated Legacy-Signal), an U-SIG (Universal-Signal), an EHT-SIG (Extremely High Throughput-Signal), an EHT-STF, an EHT-LTF, and a data field; When the wideband is a 320 MHz band, the first preamble puncturing pattern includes a pattern in which a 40 MHz or 80 MHz band is punctured in the wideband; a first phase rotation value is applied to the L-STF, the L-LTF, the L-SIG, the RL-SIG, the U-SIG, and the EHT-SIG; The transmitting STA, wherein the first phase rotation value is [1 −1 −1 −1 1 −1 −1 −1 −1 1 1 1 1 −1 1 1 1].

17. A computer-readable medium containing instructions for execution by at least one processor, comprising: The instruction: receiving a Physical Protocol Data Unit (PPDU) from a transmitting station (STA) over a broadband; and decoding the PPDU; The PPDU includes an L-STF (Legacy-Short Training Field), an L-LTF (Legacy-Long Training Field), an L-SIG (Legacy-Signal), an RL-SIG (Repeated Legacy-Signal), an U-SIG (Universal-Signal), an EHT-SIG (Extremely High Throughput-Signal), an EHT-STF, an EHT-LTF, and a data field; When the wideband is a 320 MHz band, the first preamble puncturing pattern includes a pattern in which a 40 MHz or 80 MHz band is punctured in the wideband; a first phase rotation value is applied to the L-STF, the L-LTF, the L-SIG, the RL-SIG, the U-SIG, and the EHT-SIG; A recording medium, wherein the first phase rotation value is [1 −1 −1 −1 1 −1 −1 −1 −1 1 1 1 1 −1 1 1 1].

18. In a device in a WLAN (wireless local area network) system, Memory and a processor operatively coupled to the memory; The processor: Receive a PPDU (Physical Protocol Data Unit) from a transmitting station (STA) via a broadband; configured to decode the PPDU; The PPDU includes an L-STF (Legacy-Short Training Field), an L-LTF (Legacy-Long Training Field), an L-SIG (Legacy-Signal), an RL-SIG (Repeated Legacy-Signal), an U-SIG (Universal-Signal), an EHT-SIG (Extremely High Throughput-Signal), an EHT-STF, an EHT-LTF, and a data field; When the wideband is a 320 MHz band, the first preamble puncturing pattern includes a pattern in which a 40 MHz or 80 MHz band is punctured in the wideband; a first phase rotation value is applied to the L-STF, the L-LTF, the L-SIG, the RL-SIG, the U-SIG, and the EHT-SIG; The apparatus, wherein the first phase rotation value is [1 −1 −1 −1 1 −1 −1 −1 −1 1 1 1 1 −1 1 1 1].

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