Method and apparatus for receiving PPDU via broadband in a wireless LAN system

Abstract

To provide a method and a device for receiving a PPDU.SOLUTION: A receiving STA receives a PPDU from a transmitting STA through a broadband, 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 on the basis of a first phase rotation value. The first phase rotation value is acquired on the basis of a first preamble puncturing pattern of the broadband. The first preamble puncturing pattern includes a pattern in which a 40 MHz or 80 MHz band is punctured in the broadband, when the broadband is a 320 MHz band. The first phase rotation value is [1 -1 -1 -1 1 -1 -1 -1 -1 1 1 1 -1 1 1 1].SELECTED DRAWING: Figure 24

Description

Technical Field

[0001] This specification relates to a technique for receiving a PPDU via a wide band 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 considering limited preamble puncturing.

Background Art

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

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

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

Summary of the Invention

Problems to be Solved by the Invention

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

[0006] One example in this specification proposes a method for receiving PPDU over broadband.

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

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

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

[0010] The receiving STA decodes the PPDU.

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

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

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

[0014] According to the embodiments proposed herein, by proposing a phase rotation value for broadband transmission in limited preamble puncturing conditions, a new effect is achieved in which the PAPR of L-STF and L-LTF is reduced, enabling high-power PPDU transmission. This has the effect of increasing the PPDU transmission range and improving overall performance. [Brief explanation of the drawing]

[0015] [Figure 1]An example of a transmission device and / or a reception device of this specification is shown. [Figure 2] It is a conceptual diagram showing the structure of a wireless LAN (WLAN). [Figure 3] It is a drawing explaining a normal link setup process. [Figure 4] It is a drawing showing an example of a PPDU used in the IEEE standard. [Figure 5] It is a drawing showing the arrangement of resource units (RUs) used on a 20 MHz band. [Figure 6] It is a drawing showing the arrangement of resource units (RUs) used on a 40 MHz band. [Figure 7] It is a drawing 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. [Figure 9] An example of a case where multiple User STAs are assigned to the same RU via MU-MIMO technology is shown. [Figure 10] Operations related to UL-MU are shown. [Figure 11] An example of a trigger frame is shown. [Figure 12] An example of a common information field of a trigger frame is shown. [Figure 13] An example of a subfield included in a per user information field is shown. [Figure 14] Technical features of the UORA technology are explained. [Figure 15] An example of a channel used / supported / defined within the 2.4 GHz band is shown. [Figure 16] An example of a channel used / supported / defined within the 5 GHz band is shown. [Figure 17] An example of a channel used / supported / defined within the 6 GHz band is shown. <000009 >An example of a PPDU used in this specification is shown. [Figure 19] A modified example of the transmission device and / or reception device of this specification is shown. [Figure 20] An example of a PHY transmission procedure for a HE SU PPDU is shown. [Figure 21] FIG. 21 shows an example of a block diagram of a transmission device that generates each field of a HE PPDU. [Figure 22] FIG. 22 is a flowchart showing the operation of the transmission device according to this embodiment. [Figure 23] FIG. 23 is a flowchart showing the operation of the reception device according to this embodiment. [Figure 24] FIG. 24 is a flowchart showing the procedure by which a transmission STA according to this embodiment transmits a PPDU. [Figure 25] FIG. 25 is a flowchart showing the procedure by which a reception STA according to this embodiment receives a PPDU.

Mode for Carrying Out the Invention

[0016] In this specification, "A or B" can mean "only A", "only B", or "both A and B". Also, in this specification, "A or B" can be interpreted as "A and / or B". For example, in this specification, "A, B or C" can mean "only A", "only B", "only C", or "any combination of A, B and C".

[0017] The slashes ( / ) and commas used in this specification can mean "and / or". For example, "A / B" can mean "A and / or B". Accordingly, "A / B" can mean "only A", "only B", or "both A and B". For example, "A, B, C" can mean "A, B or C".

[0018] In this specification, "at least one of A and B" can mean "just A," "just B," or "both A and B." Furthermore, in this specification, 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" may mean "just A," "just B," "just C," or "any combination of A, B and C." Also, "at least one of A, B or C" or "at least one of A, B and / or C" may mean "at least one of A, B and C."

[0020] Furthermore, parentheses used in this specification can mean "for example." Specifically, when "control information (PDCCH)" is shown, "PDCCH" is proposed as an example of "control information." Also, "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 shown, "PDCCH" is proposed as an example of "control information."

[0021] In this specification, technical features described individually within a single drawing may be represented individually or simultaneously.

[0022] The following examples in this specification apply to various wireless communication systems. For example, the following examples in this specification apply to wireless LAN (wireless local area network, WLAN) systems. For example, this specification applies to the IEEE 802.11a / g / n / ac standards and the IEEE 802.11ax standard. This specification also applies to newly proposed EHT standards or IEEE 802.11be standards. Furthermore, the examples in this specification also apply to new wireless LAN standards that improve upon the EHT standards or IEEE 802.11be. In addition, the examples in this specification apply to mobile communication systems. For example, this specification applies to mobile communication systems based on LTE (Long Term Evolution) and its evolution based on 3GPP® (3rd Generation Partnership Project) standards. Furthermore, the examples in this specification apply to 5GNR standard communication systems based on 3GPP standards.

[0023] The following describes the technical features to which this specification applies in order to explain the technical features of this specification.

[0024] Figure 1 shows an example of a transmitting and / or receiving device as described herein.

[0025] An example in Figure 1 can perform various technical features described below. Figure 1 relates to at least one STA (station). For example, STA (110, 120) in this specification is referred to by various names such as mobile terminal, wireless device, Wireless Transmit / Receive Unit (WTRU), User Equipment (UE), Mobile Station (MS), Mobile Subscriber Unit, or simply user. STA (110, 120) in this specification is referred to by various names such as network, base station, node-B, access point (AP), repeater, router, relay. STA (110, 120) in this specification is referred to by various names such as receiving device, transmitting device, receiving STA, transmitting STA, receiving device, transmitting device.

[0026] For example, an STA(110, 120) can perform either an AP (Access Point) role or a non-AP role. That is, an STA(110, 120) as described herein can perform AP and / or non-AP functions. In this specification, AP may also be referred to as AP STA.

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

[0028] In this specification, STA(110, 120) may include medium access control (MAC) and a physical layer interface to the wireless medium in accordance with the IEEE 802.11 standard.

[0029] Based on Figure 1(a), STA(110, 120) can be explained as follows.

[0030] The first STA(110) includes a processor (111), memory (112), and transceiver (113). The indicated processor, memory, and transceiver may each be implemented as separate chips, or at least two or more blocks / functions may be implemented via 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 (e.g., IEEE 802.11a / b / g / n / ac / ax / be, etc.).

[0032] For example, the first STA (110) can perform the intended operation 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 signals transmitted via the transceiver (i.e., transmitted signals).

[0033] For example, the second STA (120) can perform the intended operation of a Non-AP STA. For example, a non-AP transceiver (123) can perform signal transmission and reception operations. Specifically, it can transmit and receive IEEE 802.11 packets (e.g., IEEE 802.11a / b / g / n / ac / ax / be, etc.).

[0034] For example, the Non-AP STA processor (121) can receive signals via the transceiver (123), process the received signals, generate transmit signals, and perform control for signal transmission. The Non-AP STA memory (122) can store signals received via the transceiver (123) (i.e., received signals) and signals transmitted via the transceiver (i.e., transmitted signals).

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

[0036] For example, in the following specification, the operation of a device indicated 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 non-AP, the operation of the device indicated as non-AP is controlled by the processor (121) of the second STA (120), and the relevant signals are transmitted or received via a transceiver (123) controlled by the processor (121) of the second STA (120). In addition, control information related to the operation of non-AP and AP transmit / receive signals are stored in the memory (122) of the second STA (120). For example, if the first STA (110) is non-AP, the operation of the device indicated as non-AP is controlled by the processor (111) of the first STA (110), and the relevant signals are transmitted or received via a transceiver (113) controlled by the processor (111) of the first STA (120). Furthermore, control information related to the operation of the non-AP and the AP's transmit / receive signals are stored in the memory (112) of the first STA (110).

[0037] In the following specification, devices referred to as (transmit / receive)STA, 1stSTA, 2ndSTA, STA1, STA2, AP, 1stAP, 2ndAP, AP1, AP2, (transmit / receive)Terminal, (transmit / receive)Device, (transmit / receive)apparatus, network, etc., mean the STA(110, 120) in Figure 1. For example, devices referred to as (transmit / receive)STA, 1stSTA, 2ndSTA, STA1, STA2, AP, 1stAP, 2ndAP, AP1, AP2, (transmit / receive)Terminal, (transmit / receive)Device, (transmit / receive)apparatus, network, etc., without specific designations, also mean the STA(110, 120) in Figure 1. For example, in the following example, the operation of various STAs sending and receiving signals (e.g., PPPDU) may be performed in the transceiver(113, 123) in Figure 1. Furthermore, in the following example, the operation of various STAs generating transmit / receive signals or performing data processing or calculations in advance for transmit / receive signals may be performed by the processor (111, 121) in Figure 1. For example, an example of the operation of generating transmit / receive signals or performing data processing or calculations in advance for transmit / receive signals may include: 1) the operation of determining / acquiring / composing / calculating / decoding / encoding bit information of subfields (SIG, STF, LTF, Data) contained within the PPDU; 2) the operation of determining / composing / acquiring time resources and frequency resources (e.g., subcarrier resources) used for subfields (SIG, STF, LTF, Data) contained within the PPDU; 3) the operation of determining / composing / acquiring specific sequences (e.g., pilot sequences, STF / LTF sequences, extra sequences applied to SIG) used for subfields (SIG, STF, LTF, Data) contained within the PPDU; 4) power control operations and / or power saving operations applied to the STA; and 5) operations related to determining / acquiring / composing / calculating / decoding / encoding ACK signals.Furthermore, in the following example, various pieces of information used by various STAs for determining / acquiring / composing / calculating / decoding / encoding the transmit / receive signals (e.g., information related to fields / subfields / control fields / parameters / power, etc.) are stored in the memory (112, 122) shown in Figure 1.

[0038] The apparatus / STA shown in Figure 1(a) above is modified as shown in Figure 1(b). The STA(110, 120) described herein will be explained based on Figure 1(b) below.

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

[0040] In the following, 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 mean the STA (110, 120) shown in Figure 1(a) / (b) or the processing chip (114, 124) shown in Figure 1(b). That is, the technical features of this specification may be implemented on the STA (110, 120) shown in Figure 1(a) / (b) or only on the processing chip (114, 124) shown in Figure 1(b). For example, the technical characteristic of the transmitting STA transmitting control signals can be understood as the technical characteristic that the control signals generated in the processor (111, 121) shown in Figure 1(a) / (b) are transmitted via the transceivers (113, 123) shown in Figure 1(a) / (b). Alternatively, the technical characteristic of the transmitting STA transmitting control signals can be understood as the technical characteristic that the control signals to be transmitted to the transceivers (113, 123) are generated in the processing chip (114, 124) shown in Figure 1(b).

[0041] For example, the technical feature of a receiving STA receiving a control signal can be understood as the technical feature of the control signal being received by the transceiver (113, 123) shown in Figure 1(a). Alternatively, the technical feature of a receiving STA receiving a control signal can be understood as the technical feature of the control signal received by the transceiver (113, 123) shown in Figure 1(a) being acquired by the processor (111, 121) shown in Figure 1(a). Alternatively, the technical feature of a receiving STA receiving a control signal can be understood as the technical feature of the control signal received by the transceiver (113, 123) shown in Figure 1(b) being acquired by the processing chip (114, 124) shown in Figure 1(b).

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

[0043] The processors (111, 121) or processing chips (114, 124) shown in Figure 1 may include ASICs (application-specific integrated circuits), other chipsets, logic circuits, and / or data processing devices. The processor is an AP (application processor). For example, the processors (111, 121) or processing chips (114, 124) shown in Figure 1 may include at least one of the following: a DSP (digital signal processor), a CPU (central processing unit), a GPU (graphics processing unit), or a modem (modulator and demodulator). For example, the processors (111, 121) or processing chips (114, 124) shown in Figure 1 are SNAPDRAGON® series processors manufactured by Qualcomm®, EXYNOS® series processors manufactured by Samsung®, A series processors manufactured by Apple®, HELIO® series processors manufactured by MediaTek®, ATOM® series processors manufactured by Intel®, or improved versions thereof.

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

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

[0046] The upper part of Figure 2 shows the structure of the IEEE (Institute of Electrical and Electronic Engineers) 802.11 Infrastructure BSS (Basic Service Set).

[0047] Referring to the top of Figure 2, a wireless LAN system can include one or more infrastructure BSS(200, 205) (hereinafter, BSS). BSS(200, 205) is not a concept that refers to a specific area, but rather a set of APs (access points, 225) and STAs such as STA1 (Station, 200-1) that can synchronize and communicate with each other. A BSS(205) can include one or more connectable STAs (205-1, 205-2) in a single AP(230).

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

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

[0050] The portal (portal,220) can act as a bridge to connect a wireless LAN network (IEEE802.11) with other networks (e.g., 802.X).

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

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

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

[0054] Figure 3 is a diagram illustrating the normal link setup process.

[0055] In the S310 step shown, the STA can perform an operation to find a network. This operation to find a network may include the STA's scanning operation. That is, in order for the STA to access a network, it needs to find a network it can join. Before the STA can join a wireless network, it needs to identify compatible networks, and the process of identifying networks that exist in a particular area is called scanning. There are two scanning methods: active scanning and passive scanning.

[0056] Figure 3 illustrates the process of finding a network, including the active scanning process. In active scanning, the STA performing the scanning moves to a different channel and sends a probe request frame to search for nearby APs, and waits for a response. The responder sends a probe response frame to the STA that sent the probe request frame. Here, the responder is the STA that last sent a beacon frame in the BSS of the channel being scanned. In BSS, APs send beacon frames, so APs become the responders, while in IBSS, STAs within IBSS return and send beacon frames, so the responder is not constant. For example, an STA that sent a probe request frame on channel 1 and received a probe response frame on channel 1 can store the BSS-related information contained in the received probe response frame and move to the next channel (e.g., channel 2) and perform scanning in the same way (i.e., sending and receiving probe requests / responses on channel 2).

[0057] Although not shown as an example in Figure 3, scanning operations can also be performed using a passive scanning method. An STA performing scanning based on passive scanning can wait for beacon frames while moving between channels. In IEEE 802.11, beacon frames are one of the management frames, used to announce the presence of a wireless network and are periodically transmitted to the scanning STA to find the wireless network and join it. In BSS, APs perform the role of periodically transmitting beacon frames, and in IBSS, STAs within IBSS return and transmit beacon frames. When a scanning STA receives a beacon frame, it stores the information about the BSS contained in the beacon frame and records the beacon frame information on each channel while moving to other channels. An STA that receives a beacon frame stores the BSS-related information contained in the received beacon frame and can move to the next channel and perform scanning on the next channel in the same way.

[0058] Once the STA discovers the network, it can perform an authentication process via step S320. This authentication process is referred to as the first authentication process to clearly distinguish it from the security configuration operation in step S340, which will be described later. The authentication process in S320 may include a process in which the STA sends an authentication request frame to the AP, and in response, the AP sends an authentication response frame to the STA. The authentication frame used in the authentication request / response corresponds to the management frame.

[0059] The authentication frame may include information such as the authentication algorithm number, authentication transaction sequence number, status code, challenge text, RSN (Robust Security Network), and finite cyclic group.

[0060] The STA can send an authentication request frame to the AP. Based on the information contained in the received authentication request frame, the AP can decide whether or not to grant authentication to the STA. 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 the connection process based on step S330. The connection process involves the STA sending an association request frame to the AP, and the AP responding by sending an association response frame to the STA. For example, the association request frame may include information related to various capabilities, such as the beacon listen interval, SSID (service set identifier), supported rates, supported channels, RSN, mobility domain, supported operating classes, Traffic Indication Map Broadcast request, and interworking service capabilities. For example, a connection response frame may include information related to various capabilities, such as status code, AID (Association ID), support rate, EDCA (Enhanced Distributed Channel Access) parameter set, RCPI (Received Channel Power Indicator), RSNI (Received Signal to Noise Indicator), mobility domain, timeout interval (association comeback time), overlapping BSS scan parameters, TIM broadcast response, and QoS map.

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

[0063] Figure 4 is a diagram showing an example of a PPDU used in IEEE standards.

[0064] As shown, various forms of PPDU (PHY protocol data unit) 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] Figure 4 also includes an example of an HE PPDU according to the IEEE 802.11ax standard. The HE PPDU in Figure 4 is an example of a PPDU for multiple users, and HE-SIG-B is included only for multiple users; HE-SIG-B is omitted in PPDUs for single users.

[0066] As indicated, the HE-PPDU for Multiple Users (MU) may include L-STF (legacy-short training field), L-LTF (legacy-long training field), L-SIG (legacy-signal), HE-SIG-A (high efficiency-signal A), HE-SIG-B (high efficiency-signal B), HE-STF (high efficiency-short training field), HE-LTF (high efficiency-long training field), data field (or MAC payload), and PE (Packet Extension) field. Each field is transmitted during the indicated time interval (i.e., 4 or 8 μs, etc.).

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

[0068] Figure 5 is a diagram showing the arrangement of resource units (RUs) used in the 20MHz bandwidth.

[0069] As shown in Figure 5, Resource Units (RUs), each corresponding to a different number of tones (i.e., subcarriers), can be used to constitute some fields of the HE-PPDU. For example, resources are allocated in the RU units shown for 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 arranged. Six tones are used as guard bands in the leftmost band of the 20MHz bandwidth, and five tones are used as guard bands in the rightmost band of the 20MHz bandwidth. In addition, 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. Furthermore, 26, 52, and 106 units are allocated to the other bands. Each unit is allocated for the receiving station, i.e., the user.

[0071] On the other hand, the RU configuration in Figure 5 can be used not only for situations involving multiple users (MU) but also for situations involving a single user (SU), in which case it is possible to use one 242 unit as shown at the bottom of Figure 5, in which case three DC tones are inserted.

[0072] As shown in the example in Figure 5, various sizes of RUs, namely 26RU, 52RU, 106RU, 242RU, etc., are proposed, 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] Figure 6 is a diagram showing the arrangement of resource units (RUs) used in the 40 MHz bandwidth.

[0074] Similar to how various sizes of RU were used in the example in Figure 5, the example in Figure 6 also uses 26RU, 52RU, 106RU, 242RU, 484RU, etc. In addition, five DC tones are inserted at the center frequency, twelve tones are used as guard bands in the leftmost band of the 40MHz bandwidth, and eleven tones are used as guard bands in the rightmost band of the 40MHz bandwidth.

[0075] Furthermore, as shown, 484 RUs can be used when used for a single user. On the other hand, the specific number of RUs can be changed, as in the example in Figure 4.

[0076] Figure 7 is a diagram showing the arrangement of resource units (RUs) used in the 80MHz bandwidth.

[0077] Similar to how various RU sizes were used in the examples in Figures 5 and 6, the example in Figure 7 can also use 26RU, 52RU, 106RU, 242RU, 484RU, 996RU, etc. Additionally, seven DC tones are inserted at the center frequency, 12 tones are used as guard bands in the leftmost band of the 80MHz bandwidth, and 11 tones are used as guard bands in the rightmost band of the 80MHz bandwidth. Furthermore, a 26RU configuration can be used, utilizing 13 tones on each side of the DC bandwidth.

[0078] Also, as shown, when used for a single user, the 996RU can be used, in which case five DC tones are inserted.

[0079] The RUs described herein are used in UL (Uplink) and DL (Downlink) communications. For example, when UL-MU communication is solicited by a trigger frame, the transmitting STA (e.g., AP) can assign a first RU (e.g., 26 / 52 / 106 / 242RU, etc.) to the first STA and a second RU (e.g., 26 / 52 / 106 / 242RU, etc.) to the second STA via the trigger frame. 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 the first RU (e.g., 26 / 52 / 106 / 242RU) to the first STA and the second RU (e.g., 26 / 52 / 106 / 242RU) to the second STA. That is, within a single MU PPDU, 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.

[0081] Information regarding the RU's placement 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) may contain information that applies in common to all users receiving the SIG-B (i.e., user STA). The user-specific field (830) can be called a user-specific control field. If the SIG-B is transmitted to multiple users, the user-specific field (830) may apply to only some of those users.

[0084] As shown in Figure 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 RUs. For instance, if a 20MHz channel is used as shown in Figure 5, the RU allocation information can contain information about which RUs (26RU / 52RU / 106RU) are placed in which frequency band.

[0086] An example of a case where RU allocation information consists of 8 bits is as follows:

[0087] [Table 1]

[0088] As shown in the example in Figure 5, a maximum of nine 26RUs can be allocated to a 20MHz channel. When the RU allocation information for 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 for the common field (820) is set to "00000001" as shown in Table 1, seven 26RUs and one 52RU are allocated to the corresponding channel. In other words, in the example in Figure 5, a 52RU is allocated on the far right, and seven 26RUs are allocated to its left.

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

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

[0091] [Table 2]

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

[0093] Typically, multiple RUs are assigned multiple distinct STAs (e.g., User STAs). However, for a single RU exceeding a certain size (e.g., 10⁶ subcarriers), multiple STAs (e.g., User STAs) are assigned based on MU-MIMO technology.

[0094] As shown in Figure 8, a user-specific field (830) can contain multiple user fields. As described above, the number of STAs (e.g., User STAs) assigned to a particular 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", then one User STA is assigned to each of the nine 26RUs (i.e., a total of nine User STAs are assigned). In other words, a maximum of nine User STAs can be assigned to a particular channel via OFDMA technology. Also, a maximum of nine User STAs can be assigned to a particular channel via non-MU-MIMO technology.

[0095] For example, if the RU allocation is set to "01000y2y1y0", the 106 RU located on the far left will be allocated multiple User STAs via MU-MIMO technology, and the five 26 RU located to its right will be allocated five User STAs via non-MU-MIMO technology. This case is illustrated in the example shown in Figure 9.

[0096] Figure 9 shows an example where multiple User STAs are assigned to the same RU via MU-MIMO technology.

[0097] For example, if the RU allocation is set to "01000010" as shown in Figure 9, then, based on Table 2, 106 RUs are allocated to the leftmost end of a particular channel, and five 26 RUs are allocated to its right. Additionally, 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, allowing the HE-SIG-B user-specific field (830) to contain 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 within one User block field.

[0099] The User fields shown in Figures 8 and 9 are constructed based on two formats. Specifically, User fields related to MU-MIMO technology are constructed using the first format, while User fields related to non-MU-MIMO technology are constructed using the second format. Referring to an example in Figure 9, User fields 1 through 3 are based on the first format, and User fields 4 through 8 are based on the second format. Either the first or second format can contain the same length (e.g., 21 bits) of bit information.

[0100] Each User field can have the same size (e.g., 21 bits). For example, the User field in the first format (MU-MIMO technology format) is structured as follows:

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

[0102] [Table 3]

[0103] [Table 4]

[0104] As shown in Table 3 and / or Table 4, the second bits (i.e., B11-B14) can contain information about the number of Spatial Streams allocated to multiple User STAs allocated by MU-MIMO technology. For example, if three User STAs are allocated to 106RU based on MU-MIMO technology as shown in Figure 9, N_user is set to "3", which determines the values ​​of N_STS[1], N_STS[2], and N_STS[3] as shown in Table 3. For example, if the value of the second bits (B11-B14) is "0011", then N_STS[1]=4, N_STS[2]=1, and N_STS[3]=1. That is, in the example in Figure 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 example in Table 3 and / or Table 4, the information regarding the number of spatial streams for a user station (User STA) (i.e., the second bits, B11-B14) consists of 4 bits. Furthermore, 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 a single User STA.

[0106] Additionally, the third bit (i.e., B15-18) within the User field (i.e., 21 bits) can contain MCS (Modulation and Coding Scheme) information. The MCS information is applied to the data field within the PPDU containing the relevant SIG-B.

[0107] In this specification, MCS, MCS information, MCS index, MCS field, etc., can be represented by specific index values. For example, MCS information can be represented by index 0 to index 11. MCS information may include information about the constellation modulation type (e.g., BPSK, QPSK, 16_QAM, 64_QAM, 256_QAM, 1024_QAM, etc.) and information about the code rate (e.g., 1 / 2, 2 / 3, 3 / 4, 5 / 6, etc.). MCS information may exclude information about the channel coding type (e.g., BSS or LDPC).

[0108] Additionally, the fourth bit (i.e., B19) within the User field (i.e., 21 bits) is the Reserved field.

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

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

[0111] The first bit in the User field of the second format (e.g., B0-B10) can contain User STA identification information. The second bit in the User field of the second format (e.g., B11-B13) can contain information about the number of spatial streams applied to the corresponding RU. The third bit in the User field of the second format (e.g., B14) contains information about whether a beamforming steering matrix is ​​applied. The fourth bit in the User field of the second format (e.g., B15-B18) can contain MCS (Modulation and coding scheme) information. The fifth bit in the User field of the second format (e.g., B19) can contain information about whether DCM (Dual Carrier Modulation) is applied. The sixth bit in the User field of the second format (i.e., B20) can contain information about the coding type (e.g., BSS or LDPC).

[0112] Figure 10 illustrates the operation related to UL-MU. As shown, the transmitting STA (e.g., AP) can establish a channel connection via contending (i.e., backoff operation) and transmit a trigger frame (1030). That is, the transmitting STA (e.g., AP) can transmit a PPDU containing the trigger frame (1330). Once the PPDU containing the trigger frame is received, a trigger-based (TB) PPDU is transmitted after a delay equal to the SIFS.

[0113] TB PPDUs (1041, 1042) are sent at the same time and originate from multiple STAs (e.g., User STAs) whose AIDs are displayed in the Trigger frame (1030). The ACK frame (1050) for the TB PPDU is implemented in various forms.

[0114] The specific characteristics of the trigger frame are explained through Figures 11 to 13. When UL-MU communication is used, OFDMA (orthogonal frequency division multiple access) technology or MU MIMO technology is used, or OFDMA and MU MIMO technology are used simultaneously.

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

[0116] Each of the fields shown in Figure 11 may be partially omitted, and other fields may be added. Furthermore, the length of each field may change from what is shown.

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

[0118] The RA field (1130) contains the address information of the receiving STA for the trigger frame and may be omitted if necessary. The TA field (1140) contains the address information of the STA (e.g., AP) that transmits the trigger frame, and the common information field (1150) contains common control information applicable to the receiving STA that receives the trigger frame. For example, it may include a field that indicates the length of the L-SIG field of the up PPDU transmitted in response to the trigger frame, and 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 trigger frame. In addition, common control information may include information regarding the length of the CP and the length of the LTF field of the up PPDU transmitted in response to the trigger frame.

[0119] Furthermore, it is desirable to include individual user information fields (1160#1 to 1160#N) corresponding to the number of receiving STAs that receive the trigger frame in Figure 11. These individual user information fields are also called "assignment fields."

[0120] Furthermore, the trigger frame in Figure 11 may include a padding field (1170) and a frame check sequence field (1180).

[0121] As shown in Figure 11, each of the individual user information fields (1160#1 to 1160#N) can again contain a number of subfields.

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

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

[0124] Furthermore, the cascade indicator field (1220) indicates whether or not a cascade operation will be performed. Cascade operation means that both downlink MU transmission and uplink MU transmission are performed within the same TXOP. That is, it means that after a downlink MU transmission is performed, an uplink MU transmission will be performed after a previously set time (e.g., SIFS). In a cascade operation, there may be only one transmitting device (e.g., AP) performing downlink communication, and multiple transmitting devices (e.g., non-AP) performing uplink communication.

[0125] The CS request field (1230) indicates whether the receiving device that received the trigger frame needs to consider the status 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 trigger frame.

[0127] The CP and LTF type fields (1250) may include information regarding the LTF length and CP length of the up PPDU transmitted in response to the trigger frame. The trigger type field (1060) may 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 a trigger frame indicates a trigger frame of type Basic for a normal trigger. For example, a trigger frame of type Basic can be called a basic trigger frame.

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

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

[0131] The RU allocation field (1320) is also included. That is, when a receiving STA identified in the user identifier field (1310) transmits a TB PPDU in response to a trigger frame, it transmits the TB PPDU 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 subfield in Figure 13 may include a coding type field (1330). The coding type field (1330) can 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] Furthermore, the subfield in Figure 13 may include an MCS field (1340). The MCS field (1340) can indicate the MCS technology to be 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 following explains UORA (UL OFDMA-based Random Access) technology.

[0135] Figure 14 illustrates the technical characteristics of 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 regarding AID 0, AID 3, or AID 2045 is included, for example, in the user identification field (1310) in Figure 13. Information regarding RU1 through RU6 is included, for example, in the RU allocation field (1320) in Figure 13. AID=0 means a UORA resource for an associated STA, and AID=2045 means 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 regular ULMU.

[0137] In the example shown in Figure 14, STA1's OBO (OFDMA random access backoff) counter decreases to 0, and STA1 randomly selects the second RU resource (AID 0, RU2). Also, since STA2 / 3's OBO counters are greater than 0, no uplink resources are assigned to STA2 / 3. Furthermore, in Figure 14, STA4's AID (i.e., AID=3) is included in the trigger frame, so the RU6 resource is assigned without backoff.

[0138] Specifically, in Figure 14, STA1 is an associated STA, so there are a total of 3 eligible RA RUs for STA1 (RU1, RU2, RU3), which reduces STA1's OBO counter by 3 until it reaches 0. Similarly, in Figure 14, STA2 is an associated STA, so there are a total of 3 eligible RA RUs for STA2 (RU1, RU2, RU3), which reduces STA2's OBO counter by 3, but the OBO counter remains greater than 0. Furthermore, in Figure 14, STA3 is an unassociated STA, so there are a total of 2 eligible RA RUs for STA3 (RU4, RU5), which reduces STA3's OBO counter by 2, but the OBO counter remains greater than 0.

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

[0140] The 2.4GHz band can be referred to by other names, such as the first band. Furthermore, the 2.4GHz band refers to the frequency range in which channels adjacent to 2.4GHz (for example, channels with center frequencies between 2.4 and 2.5GHz) are used / supported / defined.

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

[0142] Figure 15 shows four channels within the 2.4 GHz band as an example. Each of the first to fourth frequency domains (1510 to 1540) can contain one channel. For example, the first frequency domain (1510) can contain 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 domain (1520) can contain channel 6. In this case, the center frequency of channel 6 is set to 2437 MHz. The third frequency domain (1530) can contain channel 11. In this case, the center frequency of channel 11 is set to 2462 MHz. The fourth frequency domain (1540) can contain 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 5GHz band.

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

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

[0146] Within the 5GHz band, multiple channels are configured, and the bandwidth of each channel can be set in various ways, such as 20MHz, 40MHz, 80MHz, or 160MHz. For example, the 5170MHz to 5330MHz frequency domain / range within UNII-1 and UNII-2 can be divided into eight 20MHz channels. At 5170MHz, the 5330MHz frequency domain / range can be divided into four channels via a 40MHz frequency domain. At 5170MHz, the 5330MHz frequency domain / range can be divided into two channels via an 80MHz frequency domain. Alternatively, at 5170MHz, the 5330MHz frequency domain / range can be divided into one channel via a 160MHz frequency domain.

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

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

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

[0150] Therefore, the indices (or channel numbers) for the 20MHz 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. Furthermore, according to the (5.940 + 0.005 * N) GHz rule mentioned above, the indices for 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] Figure 17 shows an example with 20, 40, 80, and 160 MHz channels, but 240 MHz and 320 MHz channels will be added.

[0152] The following describes the PPDUs transmitted / received in the STA of this specification.

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

[0154] The PPDU in Figure 18 is referred to by various names, such as EHT PPDU, transmit PPDU, receive PPDU, first type, or nth type PPDU. 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. Furthermore, EHT PPUs are used in EHT systems and / or new wireless LAN systems that improve upon EHT systems.

[0155] The PPDU in Figure 18 can represent some or all of the PPDU types used in an EHT system. For example, the example in Figure 18 is used for both SU (single-user) mode and MU (multi-user) mode. Also, the PPDU in Figure 18 is for one receiving STA or multiple receiving STAs. When the PPDU in Figure 18 is used for TB (Trigger-Based) mode, the EHT-SIG in Figure 18 is omitted. Furthermore, an STA that has received a trigger frame for UL-MU (Uplink-MU) communication can transmit a PPDU in the example in Figure 18 with the EHT-SIG omitted.

[0156] In Figure 18, the L-STF to EHT-LTF sequence is called a preamble or physical preamble, and is generated, transmitted, received, acquired, and decoded in the physical layer.

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

[0158] In Figure 18, the PPDU for L-LTF and L-STF is the same as in the conventional field.

[0159] The L-SIG field in Figure 18 can contain, for example, 24 bits of bit information. For example, the 24 bits of information can include a 4-bit Rate field, a 1-bit Reserved bit, a 12-bit Length field, a 1-bit ParitY bit, and a 6-bit Tail bit. For example, the 12-bit Length field can contain information 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 an EHT PPDU, the value of the Length field can be determined as a multiple of 3. For example, if the PPDU is an HE PPDU, the value of the Length field is determined as a multiple of 3 + 1 or a 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 bits of information in the L-SIG field. Subsequently, the transmitting STA can obtain 48 bits of BCC encoded data. BPSK modulation is applied to these 48 bits to generate 48 BPSK symbols. The transmitting STA can map these 48 BPSK symbols to positions excluding the pilot subcarriers {subcarrier indices -21, -7, +7, +21} and the DC subcarrier {subcarrier index 0}. As a result, the 48 BPSK symbols are mapped to subcarrier indices -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 the signals {-1,-1,-1,1} to subcarrier indices {-28, -27, +27, 28}. The above signal is used for channel estimation for the frequency domains 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. Based on the presence of the RL-SIG, the receiving STA can determine that the received PPDU is either an HE PPDU or an EHT PPDU.

[0162] After the RL-SIG in Figure 18, a U-SIG (Universal SIG) is inserted. 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, and first (type) control signal.

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

[0164] Through a U-SIG (or U-SIG field), for example, A-bit information (e.g., 52 uncoded bits) can be transmitted, with the first symbol of the U-SIG transmitting the first X bits of the total A-bit information (e.g., 26 uncoded bits), and the second symbol of the U-SIG transmitting the remaining Y bits of the total A-bit information (e.g., 26 uncoded bits). For example, a transmitting STA can obtain the 26 uncoded bits contained 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 to be assigned to each U-SIG symbol. A single 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, the A-bit information transmitted by the U-SIG (e.g., 52 uncoded bits) 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 a second symbol of the U-SIG. The CRC field is generated based on the 26 bits assigned to the first symbol of the U-SIG and the remaining 16 bits in the second symbol excluding the CRC / tail field, and is generated based on a conventional CRC calculation algorithm. The tail field is used to terminate the trellis of the convolutional decoder and is set to, for example, "000000".

[0166] The A-bit information transmitted by a U-SIG (or U-SIG field), for example, 52 uncoded bits, 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 may be assigned only to the first symbol of the U-SIG, or they may be assigned to both the first and second symbols of the U-SIG. For example, the version-independent bits and version-dependent bits can be referred to 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 can contain a 3-bit PHY version identifier. For example, the 3-bit PHY version identifier can contain information related to the PHY version of the transmitted and received PPDUs. For example, the first value of the 3-bit PHY version identifier can indicate that the transmitted and received PPDUs are EHT PPDUs. Also, when a transmitting STA transmits an EHT PPDU, it can set the 3-bit PHY version identifier to the first value. Also, a receiving STA can determine that the received PPDU is an EHT PPDU based on the PHY version identifier with the first value.

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

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

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

[0171] For example, a U-SIG may include information about: 1) a bandwidth field containing information about bandwidth; 2) a field containing information about the MCS technology applied to the EHT-SIG; 3) an indicator field containing information related to whether or not dual subcarrier modulation (DCM) technology is applied to the EHT-SIG; 4) a field containing information about the number of symbols used for the EHT-SIG; 5) a field containing information about whether or not the EHT-SIG is generated across the entire bandwidth; 6) a field containing information about the type of EHT-LTF / STF; and 7) fields 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 that puncturing is applied to a portion of the PPDU's overall bandwidth (for example, a secondary 20MHz bandwidth). For example, if an 80MHz PPDU is transmitted, the STA will apply puncturing to the secondary 20MHz bandwidth of the 80MHz band, allowing the PPDU to be transmitted only through the primary 20MHz bandwidth and the secondary 40MHz bandwidth.

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

[0174] Information regarding preamble puncturing applied to the PPDU is included in the U-SIG and / or EHT-SIG. For example, the first field of the U-SIG may contain information regarding the contiguous bandwidth of the PPDU, and the second field of the U-SIG may contain information regarding preamble puncturing applied to the PPDU.

[0175] For example, U-SIGs and EHT-SIGs can include information about preamble puncturing based on the following method: If the bandwidth of the PPDU exceeds 80 MHz, the U-SIGs are configured individually in 80 MHz units. For example, if the bandwidth of the PPDU is 160 MHz, the PPDU includes a first U-SIG for the first 80 MHz band and a second U-SIG for the second 80 MHz band. In this case, the first field of the first U-SIG contains information about the 160 MHz bandwidth, and the second field of the first U-SIG can include information about 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 contains information about the 160 MHz bandwidth, and the second field of the second U-SIG can include information about preamble puncturing applied to the second 80 MHz band (i.e., information about the preamble puncturing pattern). On the other hand, an EHT-SIG following the first U-SIG may contain information about preamble puncturing applied to the second 80 MHz band (i.e., information about the preamble puncturing pattern), and an EHT-SIG following the second U-SIG may contain information about preamble puncturing applied to the first 80 MHz band (i.e., information about the preamble puncturing pattern).

[0176] Furthermore, or more generally, U-SIG and EHT-SIG can include information about preamble puncturing based on the following methods: U-SIG can include information about preamble puncturing for all bandwidths (i.e., information about preamble puncturing patterns). That is, EHT-SIG does not include information about preamble puncturing, and only U-SIG can include information about preamble puncturing (i.e., information about preamble puncturing patterns).

[0177] U-SIGs are configured in 20MHz units. For example, when an 80MHz PPDU is configured, the U-SIGs are duplicated; that is, the 80MHz PPDU contains four identical U-SIGs. PPDUs with a bandwidth exceeding 80MHz can contain different U-SIGs.

[0178] U-SIGs are configured in 20MHz units. For example, when an 80MHz PPDU is configured, the U-SIGs are duplicated; that is, the 80MHz PPDU contains four identical U-SIGs. PPDUs with a bandwidth exceeding 80MHz can contain different U-SIGs.

[0179] The EHT-SIG in Figure 18 may contain control information for the receiving STA. The EHT-SIG is transmitted via at least one symbol, which may have a length of 4 us. Information regarding the number of symbols used for the EHT-SIG is included in the U-SIG.

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

[0181] Similar to the example in Figure 8, the common fields and user-specific fields of the EHT-SIG are coded separately. A single user block field within a user-specific field can contain information for two users, while the last user block field within a user-specific field can contain information for one user. In other words, a single user block field in an EHT-SIG can contain a maximum of two user fields. Similar to the example in Figure 9, each user field is either related to MU-MIMO assignment or non-MU-MIMO assignment.

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

[0183] Similar to the example in Figure 8, the common fields of the EHT-SIG can include RU allocation information. RU allocation information refers to information about the location of RUs to which multiple users (i.e., multiple receiving STAs) are allocated. RU allocation information is composed of 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. Each table and the displayed index can be modified, and some entries may be omitted from Tables 5 through 7, while others may be added that are not displayed.

[0185] Tables 5 through 7 provide examples related to information about the location of RUs allocated in the 20MHz band. For example, "Index 0" in Table 5 is used in a situation where nine 26RUs are allocated individually (for example, the situation shown in Figure 5 where nine 26RUs are allocated individually).

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

[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. This 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 over 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) over different frequency bands.

[0191] The EHT-SIG is constructed based on various MCS techniques. As mentioned above, information related to the MCS techniques applied to the EHT-SIG is included in the U-SIG. The EHT-SIG is constructed based on DCM techniques. For example, of the N data tones allocated for the EHT-SIG (e.g., 52 data tones), the first modulation technique is applied to half of the consecutive tones, and the second modulation technique is applied to the remaining half of the consecutive tones. That is, the transmitting STA can modulate specific control information to a first symbol based on the first modulation technique and assign it to half of the consecutive tones, and modulate the same control information to a second symbol based on the second modulation technique and assign it to the remaining half of the consecutive tones. As mentioned above, information related to whether or not DCM techniques are applied to the EHT-SIG (e.g., a 1-bit field) is included in the U-SIG. The EHT-STF in Figure 18 is used to improve automatic gain control estimation in MIMO (multiple input multiple output) or OFDMA environments. The EHT-LTF in Figure 18 is used to estimate the channel in MIMO or OFDMA environments.

[0192] The EHT-STF in Figure 18 can be configured in various types. For example, the first type of STF (i.e., 1x STF) is generated based on a first-type STF sequence in which non-zero coefficients are placed in 16 subcarrier intervals. The STF signal generated based on the first-type STF sequence can have a period of 0.8 μs, and a 0.8 μs periodic signal repeats 5 times to become a first-type STF with a length of 4 μs. For example, the second type of STF (i.e., 2x STF) is generated based on a second-type STF sequence in which non-zero coefficients are placed in 8 subcarrier intervals. The STF signal generated based on the second-type STF sequence can have a period of 1.6 μs, and a 1.6 μs periodic signal repeats 5 times to become a second-type EHT-STF with a length of 8 μs. Below, an example of a sequence for constructing an EHT-STF (i.e., an EHT-STF sequence) is presented. The following sequence can be modified in various ways.

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

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

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

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

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

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

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

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

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

[0202] [Math 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] For an 80+80MHz PPDU, the sequence for the lower 80MHz of the EHT-STF is the same as in Equation 4. For an 80+80MHz PPDU, the sequence for the upper 80MHz of the EHT-STF is constructed based on the following formula.

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

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

[0206] [Mathematics 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] [Mathematics 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] [Mathematics 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] [Math 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] For an 80+80MHz PPDU, the sequence for the lower 80MHz of the EHT-STF is the same as in equation 9. For an 80+80MHz PPDU, the sequence for the upper 80MHz of the EHT-STF is constructed based on the following equation.

[0214] [Math 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-LTFs can have first, second, and third types (i.e., 1x, 2x, and 4x LTFs). For example, first / second / third type LTFs are generated based on LTF sequences in which non-zero coefficients are placed in 4 / 2 / 1 subcarrier intervals. First / second / third type LTFs can have time lengths of 3.2 / 6.4 / 12.8 μs. In addition, various lengths of GI (e.g., 0.8 / 1 / 6 / 3.2 μs) can be applied to first / second / third type LTFs.

[0216] Information regarding the type of STF and / or LTF (including information regarding GI applicable to the LTF) is contained in the SIG A field and / or SIG B field in Figure 18, etc.

[0217] The PPDU in Figure 18 (i.e., EHT-PPDU) is constructed based on the examples in Figures 5 and 6.

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

[0219] An EHT PPDU transmitted over the 40MHz bandwidth, i.e., a 40MHz EHT PPDU, is constructed based on the RUs shown in Figure 6. That is, the location of the RUs for the EHT-STF, EHT-LTF, and data field included in the EHT PPDU is determined as shown in Figure 6.

[0220] Since the RU position in Figure 6 corresponds to 40MHz, repeating the pattern in Figure 6 twice will determine the tone plan for 80MHz. In other words, the 80MHz EHT PPDU is transmitted based on a new tone plan in which the RU in Figure 6 (which is not the RU in Figure 7) is repeated twice.

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

[0222] The tone plan for 160 / 240 / 320MHz consists of the pattern shown in Figure 6 repeated many times.

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

[0224] The receiving STA can determine the type of the received PPDU to be 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 (where the L-SIG is repeated) is detected in the received PPDU, and 3) applying "modulo3" to the value of the Length field of the L-SIG of the received PPDU results in "0", then 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 the EHT PPDU (e.g., SU / MU / Trigger-Based / Extended Range type) based on the bit information contained in the symbols after the RL-SIG in Figure 18. Furthermore, 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 BSPK, 2) the RL-SIG which is consecutive to the L-SIG field and is the same as the L-SIG, and 3) the L-SIG which includes the Length field where the result of applying "modulo3" is set to "0".

[0225] For example, a receiving STA can determine the type of the received PPDU to be an HE PPDU based on the following: For example, if 1) the first symbol after the L-LTF signal is BPSK, 2) an RL-SIG (where L-SIG is repeated) is detected, and 3) the result of applying "modulo3" to the Length value of L-SIG is detected as "1" or "2", then 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: For example, if 1) the first symbol after the L-LTF signal is BPSK, and 2) no RL-SIG (where L-SIG is repeated) is detected, the received PPDU is determined to be non-HT, HT, or VHT PPDU. Also, even if the receiving STA detects a repetition of RL-SIG, if the result of applying "modulo3" to the Length value of L-SIG is detected as "0", the received PPDU is determined to be non-HT, HT, or VHT PPDU.

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

[0228] Figure 19 shows a modified example of the transmitting and / or receiving apparatus described herein.

[0229] Each device / STA in Figures 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 may include a receiver and a transmitter.

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

[0231] The memory (150) in Figure 19 is the same as the memory (112, 122) in Figure 1. Alternatively, the memory (150) in Figure 19 is a different external memory than the memory (112, 122) in Figure 1.

[0232] Referring to Figure 19, the power management module (611) manages power to the processor (610) and / or transceiver (630). The battery (612) supplies power to the power management module (611). The display (613) outputs the results processed by the processor (610). The keypad (614) receives inputs used by the processor (610). The keypad (614) can display the phase rotation value on the display (613). The SIM card (615) is an integrated circuit used to securely store IMSI (international mobile subscriber identity) and associated keys used to identify and authenticate subscribers in mobile phone devices such as mobile phones and computers.

[0233] Referring to Figure 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, "tone plan" refers to the rules that determine the size and / or location of a Resource Unit (RU). Below, we describe the tone plan applicable to PPDUs under the IEEE 802.11ax standard, i.e., HE PPDUs. We also describe the RU size and location applicable to HE PPDUs, and the control information related to RUs applicable to HE PPDUs.

[0236] In this specification, control information related to a RU (or control information related to a tone plan) may include control information regarding the size of the RU, its location, information about the User STA assigned to a particular RU, the frequency bandwidth for the PPDU containing the RU, and / or the modulation technique applied to a particular RU. The control information related to the RU is contained in the SIG field. For example, in the IEEE 802.11ax standard, the control information related to the RU is contained in the HE-SIG-B field. That is, in the process of generating a transmitted PPDU, a transmitting STA can include control information for the RU contained in the PPDU in the HE-SIG-B field. A receiving STA can also receive the HE-SIG-B contained in a received PPDU, obtain the control information contained in the HE-SIG-B, determine if there is an RU assigned to the 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 RU (Routing Unit). That is, when a first RU is set for a first receiving STA, the STF / LTF / Data fields for the first receiving STA are transmitted and received via the first RU.

[0238] The IEEE 802.11ax standard defines separate PPDUs for a single receiving STA (i.e., SU PPDU) and for multiple receiving STAs (i.e., MU PPDU), and each has its own separate tone plan. The specific details are explained below.

[0239] A RU defined as 11ax can contain multiple subcarriers. For example, if a RU contains N subcarriers, it can be expressed as an N-tone RU or NRU. The location of a particular RU can be expressed as a subcarrier index. A subcarrier index is defined as a subcarrier frequency spacing unit. In the 11ax standard, the subcarrier frequency spacing is 312.5 kHz or 78.125 kHz, and the subcarrier frequency spacing for a RU is 78.125 kHz. That is, subcarrier index +1 for a RU means a location 78.125 kHz higher than the DC tone, and subcarrier index -1 for a RU means a location 78.125 kHz lower than the DC tone. For example, if the location of a particular RU is expressed as [-121:-96], the RU is located in the region from subcarrier index -121 to subcarrier index -96, and consequently, the RU can contain 26 subcarriers.

[0240] The N-tone RU can include a pre-set pilot tone.

[0241] 2. Null subcarrier and pilot subcarrier

[0242] This section explains subcarriers and resource allocation in 802.11ax systems.

[0243] OFDM symbols are composed of subcarriers, and the number of subcarriers can function as the bandwidth of the PPDU. In wireless LAN 802.11 systems, data subcarriers used for data transmission, pilot subcarriers used for phase information and parameter tracking, and unused subcarriers not used for data transmission or pilot transmission are defined.

[0244] HE MU PPDUs using OFDMA transmission are transmitted as a mixture of 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, null subcarriers are located between the 26-tone RU, 52-tone RU, and 106-tone RU positions. Null subcarriers are located around DC or edge tones to protect against transmit center frequency leakage, receiver DC offset, and interference from adjacent RUs. Null subcarriers have zero energy. The indices of null subcarriers are listed below.

[0248] JPEG0007830532000008.jpg97170

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

[0250] 2) Pilot subcarrier

[0251] If a pilot subcarrier exists in the HE-LTF field of HE SU PPDU, HE MU PPDU, HE ER SU PPDU, or HE TB PPDU, the position of the pilot sequence within the HE-LTF field and data field is the same as the position in 4x HE-LTF. In 1x HE-LTF, the position of the pilot sequence within HE-LTF consists of the pilot subcarrier for the data field multiplied by 4. If a pilot subcarrier exists in 2x HE-LTF, the position of the pilot subcarrier must be the same as the position of the pilot within 4x data symbols. All pilot subcarriers are located in the even-numbered indices listed below.

[0252] JPEG0007830532000009.jpg43159

[0253] JPEG0007830532000010.jpg66160

[0254] At 160MHz or 80+80MHz, the pilot subcarrier must use the same 80MHz position relative to both sides of 80MHz.

[0255] 3. HE transmission procedure and phase rotation

[0256] In an 802.11ax wireless LAN system, there are physical (PHY) transmission procedures for HE SU (Single User) PPDU, HE ER (Extended Range) SU PPDU, HE MU (Multi User) PPDU, and HE TB (Trigger-Based) PPDU. The FORMAT field of PHY-TXSTART.request(TXVECTOR) is the same for HE_SU, HE_MU, HE_ER_SU, or HE_TB. The aforementioned 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 HE SU PPDU.

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

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

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

[0260] After the start of PHY preamble transmission, 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 the PSDU are encoded in the transmitter block diagram described later. Data needs to be exchanged between the MAC and the 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 bits of the coded PSDU an integer multiple of the number of coded bits per OFDM symbol.

[0262] Transmission is prematurely terminated by the MAC via a PHY-TXEND.request primitive. The PSDU transmission is terminated by receiving a PHY-TXEND.request primitive. Each PHY-TXEND.request primitive can inform that it has been received together with a PHY-TXEND.confirm primitive from the PHY.

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

[0264] In the PHY, the GI (Guard Interval) indicated 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] If the PPDU transmission is completed, the PHY entity will enter the receive state.

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

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

[0268] a) pre-FEC PHY padding

[0269] b) Scrambler

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

[0271] d) post-FEC PHY padding

[0272] e) Stream parser

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

[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 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 [[ID=​​​​​​​​​​

[0289] v) Windowing

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

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

[0292] The data bit sequence encoded by the LDPC encoder is divided into multiple spatial streams by a stream parser. At this point, 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 for transmission by the PPDU, and is set in the same way 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. Thereafter, the first and second data fragments are constellation mapped to the respective 80 MHz bands, resulting in an LDPC mapping.

[0294] In HE MU transmission, the PPDU encoding processor runs independently in each Resource Unit (RU) for each user up to the input of the spatial mapping block, except that CSD (cyclic shift diversity) is performed with knowledge of the spatial-temporal stream start index for the relevant user. All user data in the RU is combined and mapped into the transmission 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 20MHz increments. That is, among the HE PPDU fields defined in 802.11ax, phase rotation is applied to L-STF, L-LTF, L-SIG, RL-SIG, HE-SIG-A, and HE-SIG-B.

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

[0297] JPEG0007830532000011.jpg43148

[0298] JPEG0007830532000012.jpg52147

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

[0300] JPEG0007830532000013.jpg93147

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

[0302] JPEG0007830532000014.jpg45147

[0303] JPEG0007830532000015.jpg89147

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

[0305] JPEG0007830532000016.jpg113148

[0306] JPEG0007830532000017.jpg18148

[0307] The following section explains the values ​​of phase rotation.

[0308] JPEG0007830532000018.jpg1525 is used to show tone phase rotation. JPEG0007830532000019.jpg1525 is determined as follows by the TXVECTOR parameter CH_BANDWIDTH.

[0309] JPEG0007830532000020.jpg45149

[0310] Each bandwidth The values ​​for JPEG0007830532000021.jpg1525 are as follows:

[0311] JPEG0007830532000022.jpg77150

[0312] JPEG0007830532000023.jpg33150

[0313] Since the phase rotation value is defined in 20MHz units, the phase rotation value used for 80MHz PPDU transmission is [1,-1,-1,-1], and the phase rotation value used for 80+80MHz or 160MHz PPDU transmission is [1,-1,-1,-1,1,-1,-1,-1].

[0314] 4. Embodiments applicable to this specification

[0315] Wireless LAN 802.11 systems consider using wider bandwidth than existing 11ax systems or transmitting increased streams using more antennas to increase peak throughput. This specification also considers methods of using aggregations of various bands.

[0316] This specification proposes a phase rotation applied to the Legacy preamble and EHT-SIG part (or the field immediately preceding the EHT-STF) of a PPDU when transmitting it using a wideband frequency (240 MHz or 320 MHz). In particular, it proposes an optimized phase rotation that takes into account limited preamble puncturing conditions.

[0317] A typical structure of 802.11bePPDU (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 each 20MHz consists of 52 data tones and 4 pilot tones. It is also modulated in the same way as HE-SIG-A. The EHT-SIG is divided into a common field and a user-specific field, and encoded into a variable MCS. The information to assign the RU is placed in the common field and the user-specific field.

[0318] When transmitting PPDU at the transmitting end, phase rotation is applied to lower the PAPR (Peak-to-Average Power Ratio). 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 20MHz increments.

[0319] In 802.11be, contiguous 240 / 320MHz and non-contiguous 160+80 / 80+160 / 160+160MHz bandwidths are used in addition to the existing 20 / 40 / 80 / 160 / 80+80MHz bandwidths. Here, 240 / 160+80 / 80+160MHz can be considered as 320MHz or 160+160MHz with the 80MHz portion punctured; that is, the phase rotation values ​​used for 320MHz or 160+160MHz can be applied to 240 / 160+80 / 80+160MHz excluding the punctured 80MHz phase rotation. Therefore, this specification first proposes the phase rotations for 320MHz or 160+160MHz, and the phase rotations for 240 / 160+80 / 80+160MHz, which are created by puncturing these, will be described later. Furthermore, this embodiment proposes an additional phase rotation at 240 / 160+80 / 80+160MHz. In addition, this embodiment proposes a unified phase rotation that can reduce the PAPR as much as possible when considering both the full band allocation situation and the relevant preamble puncturing situation, taking into account the limited preamble puncturing situation.

[0320] As explained earlier, the phase rotation value used for 80MHz PPDU transmission in an 802.11ax wireless LAN system is [1,-1,-1,-1], and the phase rotation value used for 80+80MHz or 160MHz PPDU transmission is [1,-1,-1,-1,1,-1,-1,-1].

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

[0322] In this specification, the subcarrier index (e.g., -128 to 127) is set based on a subcarrier spacing of N kHz. That is, subcarrier index 0 is the DC component in the frequency domain, subcarrier index 1 (i.e., +1 subcarrier) represents the tone / subcarrier corresponding to +N kHz, and subcarrier index -1 (i.e., -1 subcarrier) represents the tone / subcarrier corresponding to -N kHz. The N value is, for example, 78.125 kHz. For example, the phase rotation value for an 80 MHz bandwidth of 802.11ax has four coefficient values, i.e., 1, -1, -1, -1, with the first coefficient value ("1") applied to the -128 to -65 subcarrier and the second coefficient value ("-1") applied to the -64 to -1 subcarrier. Additionally, the third coefficient value ("-1") applies to subcarriers from 0 to 63, and the fourth coefficient value ("-1") applies to subcarriers from 64 to 127.

[0323] 4.1. 320MHz or 160+160MHz

[0324] Based on the contiguous 320MHz phase rotation, the following phase rotation can be proposed for the non-contiguous 160+160MHz: The phase rotation of the 160MHz portion corresponding to the low frequency of the contiguous 320MHz is directly applied to the phase rotation of the 160MHz portion corresponding to the low frequency of the non-contiguous 160+160MHz, and the phase rotation of the 160MHz portion corresponding to the high frequency of the contiguous 320MHz is directly applied to the phase rotation of the 160MHz portion corresponding to the high frequency of the non-contiguous 160+160MHz.

[0325] The subcarrier index for a Contiguous 320MHz is -512 to 511, and the various phase rotation values ​​proposed below have the following form.

[0326] [abcdefghijklmnop]

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

[0328] Furthermore, at 320MHz, in addition to full band allocation, limited preamble puncturing should be 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 indicates whether a particular 20MHz channel is punctured or not, and the channels are listed in order from the lowest frequency 20MHz channel to the highest frequency 20MHz channel.

[0344] PAPR calculations utilized L-STF and L-LTF, assuming a 4x IFFT / IDFT (e.g., IFFT / IDFT based on a 78.125 kHz subcarrier spacing).

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

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

[0347] JPEG0007830532000024.jpg62157

[0348] JPEG0007830532000025.jpg107162

[0349] JPEG0007830532000026.jpg115156

[0350] As another example, when a PPDU is transmitted using the OFDMA method, first, if the bandwidth is specified as 80 / 160 / 320MHz based on the BW (bandwidth) field of U-SIG-1, then the 4-bit bitmap (the last bit is ignored) in the Punctured Channel Information field can indicate whether or not puncturing is performed for each 80MHz segment (segment). The 4-bit bitmap is applied from the lowest bit to the highest bit, from the lowest frequency 20MHz channel to the highest frequency 20MHz channel. If each bit of the 4-bit bitmap points to 0, the corresponding 20MHz channel is punctured, and if each bit of the 4-bit bitmap points to 1, the corresponding 20MHz channel is not punctured. The permitted puncturing patterns for an 80MHz 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 aforementioned puncturing patterns may differ for each other at different 80MHz frequencies.

[0351] Furthermore, we will explain the Transmitter Modulation Accuracy (EVM) test. This is related to RF capability, which will be discussed later.

[0352] The procedure for testing the transmitter modulation accuracy for occupied subcarriers in the PPDU is as follows:

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

[0354] b) The test apparatus needs to detect the transition from L-STF to L-LTF and set a precise timing.

[0355] c) The test apparatus needs to estimate the minute frequency offset approximately.

[0356] d) The PPDU symbols need to be reversed by the estimated frequency offset. Sampling offset drift also needs to be compensated for.

[0357] e) For each EHT-LTF symbol, the test apparatus converts the symbol to a subcarrier received value, estimates the phase from the pilot subcarrier, and reverses the subcarrier value based on the estimated phase. In the case of a 320MHz PPDU, the phase estimation is robust to uncorrelated phase noise in the lower and upper 160MHz frequency portions of the PPDU. In this case, if the lower and upper 160MHz channels have uncorrelated phase noise, the 320MHz PPDU is transmitted via two RFs with 160MHz capability. Conversely, if the lower and upper 160MHz channels have correlated phase noise, the 320MHz PPDU is transmitted via a single RF with 320MHz capability.

[0358] f) The test apparatus estimates the complex channel response coefficient for each subcarrier and each transmission stream.

[0359] g) For each data OFDM symbol, the test apparatus converts the symbol to the subcarrier received value, estimates the phase from the pilot subcarrier, compensates the subcarrier value with the estimated phase, and groups the results for all receiver chains of each subcarrier as follows: Multiply the vector by the 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 portions of the PPDU.

[0360] h) The test apparatus finds the nearest 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 apparatus calculates the average of the RMS of all errors per PPDU over PPDU.

[0362] 4.1.1. Existing 160MHz phase rotation repetition

[0363] The existing 160MHz phase rotation is simply repeated twice, [1 -1 -1 -1 1 -1 -1 -1 1 -1 -1 -1 1 -1 -1 -1], and the PAPR for L-STF and L-LTF can be calculated considering the following various cases. This is simply an extension of the existing one and is the same for all 80MHz or 160MHz units, so 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 a single 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] PPDU can be transmitted to two 160 MHz capacity RFs or one 320 MHz capacity RF. In this case, the max PAPR value for L-STF / L-LTF is the same as in Table 8.

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

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

[0371] As in this embodiment, when transmitting PPDU to RFs with various capabilities by repeatedly performing an existing 160MHz phase rotation while considering all preamble puncturing patterns, rather than just a limited number of preamble puncturing patterns, the max PAPR values ​​for L-STF / L-LTF are as shown in Table 9.

[0372] [Table 9]

[0373] Comparing Table 8 and 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 an even 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 new effect of guaranteeing improved performance in the 320 MHz band without complex implementation.

[0374] 4.1.2. Consider additional phase rotation in 160MHz increments.

[0375] When transmitting using a single 320MHz capacity RF, an additional phase rotation value can be multiplied in 160MHz increments to reduce the PAPR. {ab} represents the phase rotation that is further multiplied in 160MHz increments. That is, a is the phase rotation that is further multiplied from -512 to -1, and b is the phase rotation that is further multiplied from 0 to 511, and these are then multiplied again 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 rotations for each 20MHz 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 a specific value to the whole and multiplying by it.

[0380] [Table 10]

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

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

[0385] As in this embodiment, when considering all preamble puncturing patterns, rather than just a limited number of preamble puncturings, and repeatedly performing the existing 160MHz phase rotation, and considering additional phase rotations in 160MHz units to transmit PPDU to RFs with various capabilities, 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 an even 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 new effect of guaranteeing improved performance in the 320 MHz band without complex implementation.

[0388] 4.1.3. Consideration of additional phase rotation in 80MHz increments

[0389] To further reduce PAPR, an additional phase rotation value can be applied in 80MHz increments. <abcd>This represents a phase rotation that is further multiplied in units of 80MHz. That is, a is a phase rotation that is further multiplied by a subcarrier of -512 to -257, b is a subcarrier of -256 to -1, c is a subcarrier of 0 to 255, and d is a subcarrier of 256 to 511, and this repeated phase rotation is further multiplied 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 20MHz phase rotations 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 a specific value to the whole and multiplying by it.

[0394] [Table 12]

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

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

[0399] The above results remain the same even if the following preamble puncturing is further considered.

[0400] [OOXX XXOO OOOO OOOO]

[0401] [OOOO OOXX XXOO OOOO]

[0402] [OOOO OOOO OOXX XXOO]

[0403] Considering a scenario where a PPDU is transmitted using a single RF with a 320MHz capacitance, an additional phase rotation method in 4.1.3.80MHz increments, which has a relatively small PAPR, is preferred.

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

[0405] 4.2.1. 80MHz punctured 320MHz or 160+160MHz phase rotation

[0406] 240MHz can be thought of as an 80MHz puncturing of 320MHz, and therefore, instead of designing a separate phase rotation for 240MHz, it can be unified and used with the phase rotation of 320MHz. For example, assuming that the phase rotation [1 -1 -1 -1 1 -1 -1 -1 -1 -1 1 1 1 1 -1 1 1] is used at 320MHz, and the first 80MHz is punctured and used for 240MHz transmission, then the following phase rotation value will be applied to 240MHz.

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

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

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

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

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

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

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

[0414] The following proposal addresses an additional 240MHz phase rotation.

[0415] Based on the contiguous 240MHz phase rotation, the following phase rotations can be proposed for the non-contiguous 80+160 / 160+80MHz: The phase rotation of the 80 / 160MHz portion, which corresponds to the low frequency of the contiguous 240MHz, is directly applied to the 80 / 160MHz phase rotation of the non-contiguous 80+160 / 160+80MHz, and the phase rotation of the 160 / 80MHz portion, which corresponds to the high frequency of the contiguous 240MHz, is directly applied to the 160 / 80MHz phase rotation of the non-contiguous 80+160 / 160+80MHz.

[0416] The subcarrier index for a Contiguous 240MHz is -384 to 383, and the various phase rotation values ​​proposed below have the following form.

[0417] [abcdefghijkl]

[0418] This refers to the phase rotation applied to each 20MHz from low frequency 20MHz to high frequency 20MHz. In other words, a is the phase rotation applied to the subcarriers -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 the phase rotation applied to the subcarriers -320 to 383.

[0419] Furthermore, at 240MHz, in addition to full band allocation, limited preamble puncturing should be 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 indicates whether a particular 20MHz channel is punctured or not, and the channels are listed in order from the lowest frequency 20MHz channel to the highest frequency 20MHz channel.

[0432] PAPR calculations utilized L-STF and L-LTF, assuming a 4x IFFT / IDFT (e.g., IFFT / IDFT based on a 78.125 kHz subcarrier spacing).

[0433] 4.2.2 Existing 80MHz phase rotation repetition

[0434] Simply using the existing 80MHz phase rotation repeated three times, [1 -1 -1 -1 1 -1 -1 -1 1 -1 -1 -1], the PAPR for L-STF and L-LTF can be calculated considering the following various cases. This is simply an extension of the existing one and is the same for all 80MHz units, so additional implementation may not be necessary. In other words, there is an implementation benefit when transmitting a 240MHz PPDU using several 80MHz capa RFs and 160MHz capa RFs.

[0435] In the following, the maximum transmittable RF capacity is considered for 320MHz, and the 240MHz capacity is not considered. This is to avoid the need for additional IFFT implementation for 240MHz and to gain implementation benefits.

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

[0437] A PPDU can be transmitted over a single 320MHz capacity 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] PPDU can be transmitted to three 80MHz capacity RFs, one 80MHz capacity RF and one 160MHz capacity RF, or one 320MHz capacity RF. In this case, the max PAPR value for L-STF / L-LTF is the same as in Table 13.

[0441] As in this embodiment, when transmitting PPDU to RFs with various capabilities by repeatedly performing the existing 80MHz phase rotation while considering all preamble puncturing patterns, rather than just a limited number of preamble puncturing patterns, the max PAPR values ​​for L-STF / L-LTF are as shown in Table 14.

[0442] [Table 14]

[0443] Comparing Table 13 and 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 an even 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 new effect of guaranteeing improved performance in the 240 MHz band without complex implementation.

[0444] 4.2.3. Consideration of additional phase rotation in 80MHz increments

[0445] To further reduce PAPR, an additional phase rotation value can be applied in 80MHz increments. This represents a phase rotation that is further multiplied in units of 80MHz. That is, a is a phase rotation that is further multiplied by a subcarrier of -384 to -129, b is a subcarrier of -128 to 127, and c is a subcarrier of 128 to 383, and these repeated phase rotations are further multiplied to form a new phase rotation value.

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

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

[0448] [1 -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 a specific value to the whole and multiplying by it.

[0450] [Table 15]

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

[0452] [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] As in this embodiment, when considering all preamble puncturing patterns, rather than just a limited number of preamble puncturings, and repeatedly performing the existing 80MHz phase rotation, and considering additional phase rotations in 80MHz units, to transmit PPDUs to RFs with various capabilities, 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 an even 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 new effect of guaranteeing 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 considered.

[0460] [OOXX XXOO OOOO]

[0461] [OOOO OOXX XXOO]

[0462] When constructing a 240MHz phase rotation by puncturing a 320MHz transistor, the method in 4.2.1 is preferred, as it offers implementation benefits in unifying the phase rotation with the 320MHz transistor. While the method in 4.2.3 may be preferred when considering PAPRs, various RF capacities, and some preamble puncturing situations, it introduces additional implementation overhead as it may involve applying 80MHz of different phase rotations.

[0463] Figure 22 is a procedure flowchart showing the operation of the transmitting device according to this embodiment.

[0464] The phase rotation described above is applied as shown in the example in Figure 22.

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

[0466] In step S2210, the transmitter can obtain control information for the STF sequence. For example, the transmitter can obtain information regarding the Bandwidth (e.g., 80 / 160 / 240 / 320 MHz) to be applied to the STF sequence. Additionally or alternatively, the transmitter can obtain information regarding the features to be applied to the STF sequence (e.g., information instructing the generation of 1x, 2x, and 4x sequences).

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

[0468] Step S2220 can include more specific sub-steps.

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

[0470] Additionally or alternatively, the S2220 step may further include a step that performs power boosting.

[0471] The S2220 step can also be called the step that generates a Sequence.

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

[0473] Step S2220 can include more specific sub-steps.

[0474] For example, the transmitter can perform a Phase rotation step. Specifically, the transmitter can also perform a Phase rotation step in units of 20 MHz * N (N = integer) on the sequence generated via the S2220 step.

[0475] Additionally or alternatively, the transmitter performs at least one of the following operations: CSD, Spatial Mapping, IDFT / IFFT operation, or GI insertion (insert).

[0476] The signals / fields / sequences configured herein are transmitted in the form shown in Figure 18.

[0477] The phase rotation described above is applied based on the apparatus shown in Figure 21.

[0478] Figure 22 shows an example related to an example of a transmitting device (AP and / or non-AP STA).

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

[0480] The memory 112 can store information for a number of STF sequences described herein. It can also store control information for STF sequence / PPDU generation.

[0481] The processor 111 can generate various sequences (e.g., STF sequences) based on the information stored in the memory 112 and configure a PPDU. An example of a PPDU generated by the processor 111 is shown in Figure 18.

[0482] The processor 111 can perform some of the operations shown in Figure 22. For example, it can acquire control information for STF sequence generation and construct an STF sequence.

[0483] For example, the processor 111 may include additional detail units. The detail units included in the processor 111 are configured as shown in Figure 21. That is, as shown, the processor 111 can perform operations such as CSD, Spatial Mapping, IDFT / IFFT operation, and GI insertion (insert).

[0484] The transceiver 113 shown includes an antenna and is capable of performing analog signal processing. Specifically, the processor 111 controls the transceiver 113 and can transmit the PPDU generated by the processor 111.

[0485] Figure 23 is a procedure flowchart showing the operation of the receiving device according to this embodiment.

[0486] The phase rotation described above is applied as shown in the example in Figure 23.

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

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

[0489] In step S2310, the receiving device can receive a signal / field containing an STF sequence (i.e., an EHTSTF / EHTS sequence) via step S2310. The received signal is in the form shown in Figure 18.

[0490] The sub-step of step S2310 is determined based on step S2230. That is, step S2310 can perform operations to restore the results of the Phase rotation CSD, Spatial Mapping, IDFT / IFFT operations, and GI insertion (insert) 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 a step of decoding the data field of the PPDU, which contains an STF sequence. That is, the receiving device can decode the signal contained within the data field of the PPDU that was successfully received based on the STF sequence.

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

[0495] For example, the receiving device can perform a processing operation to transmit the decoded data to a higher layer (e.g., the MAC layer) via the S2320 step. Furthermore, if the higher layer instructs the PHY layer to generate a signal in response to the data transmitted, the receiving device can perform subsequent operations.

[0496] The phase rotation described above is applied based on the apparatus shown in Figure 21.

[0497] Figure 23 shows an example related to an example of a transmitting device (AP and / or non-AP STA).

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

[0499] The memory 112 can store information for a number of STF sequences described herein. It can also store control information for STF sequence / PPDU generation.

[0500] The processor 111 can generate various sequences (e.g., STF sequences) based on the information stored in the memory 112 and configure a PPDU. An example of a PPDU generated by the processor 111 is shown in Figure 18.

[0501] The processor 111 can perform some of the operations shown in Figure 22. For example, it can acquire control information for STF sequence generation and construct an STF sequence.

[0502] For example, the processor 111 may include additional detail units. The detail units included in the processor 111 are configured as shown in Figure 20. That is, as shown, the processor 111 can perform operations such as CSD, Spatial Mapping, IDFT / IFFT operation, and GI insertion (insert).

[0503] The transceiver 113 shown includes an antenna and is capable of performing analog signal processing. Specifically, the processor 111 controls the transceiver 113 and can transmit the PPDU generated by the processor 111.

[0504] Some of the technical features shown in Figure 21 are implemented by the transceiver 113. Specifically, the Analog RF processing shown is included in the transceiver 113.

[0505] The embodiments described above will be explained below with reference to Figures 1 to 23.

[0506] Figure 24 is a flowchart illustrating the procedure for transmitting a PPDU within this embodiment.

[0507] An example shown in Figure 24 is executed in a network environment that supports a next-generation wireless LAN system (IEEE 802.11be or EHT wireless LAN system). This next-generation wireless LAN system is an improved version of the 802.11ax system and can satisfy backward compatibility with the 802.11ax system.

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

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

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

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

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

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

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

[0515] This embodiment proposes a method for obtaining phase rotation values ​​by considering a limited preamble puncturing pattern, namely the first preamble puncturing pattern.

[0516] Since the broadband is 320 MHz or 160 + 160 MHz, the broadband can include first to fourth 80 MHz bands. The first to fourth 80 MHz bands are arranged in order from lower to higher frequencies and are contiguous with each other. The first preamble puncturing pattern can include first to eighth patterns.

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

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

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

[0520] The fifth to eighth patterns described above are patterns in which the 80MHz band is punctured in the broadband, and the first to fourth 80MHz bands themselves are punctured, while two or more 80MHz 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, we will explain the subcarrier range to which the phase rotation value is applied.

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

[0524] Of the first phase rotation values, the fifth 1 applies to subcarriers with subcarrier indices from -256 to -193, the sixth -1 applies to subcarriers with subcarrier indices from -192 to -129, the seventh -1 applies to subcarriers with subcarrier indices from -128 to -65, and the eighth -1 applies to subcarriers with subcarrier indices from -64 to -1.

[0525] Of the first phase rotation values, the 9th -1 applies to subcarriers with subcarrier indices from 0 to 63, the 10th 1 applies to subcarriers with subcarrier indices from 64 to 127, the 11th 1 applies to subcarriers with subcarrier indices from 128 to 191, and the 12th 1 applies to subcarriers with subcarrier indices from 192 to 255.

[0526] Of the first phase rotation values, the 13th -1 applies to subcarriers with subcarrier indices from 256 to 319, the 14th 1 applies to subcarriers with subcarrier indices from 320 to 383, the 15th 1 applies to subcarriers with subcarrier indices from 384 to 447, and the 16th 1 applies to subcarriers with subcarrier indices from 448 to 511.

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

[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 the phase rotation value for the 80MHz band as defined in an 802.11ax wireless LAN 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] ([1 -1 -1 -1] is repeated four times).

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

[0530] This embodiment proposes a method for performing additional phase rotation (third phase rotation value) in each 80MHz unit while repeatedly applying a phase rotation value (second phase rotation value) for an 80MHz band defined in an 802.11ax wireless LAN system.

[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. Of the third phase rotation value, the first 1 is applied to the first 80MHz band, the second 1 is applied to the second 80MHz band, the third -1 is applied to the third 80MHz band, and the fourth -1 is applied to the fourth 80MHz 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 to be [1 -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 L-LTF can be guaranteed for wideband transmission.

[0532] The above-described embodiment is the same when the PPDU is transmitted over the 240MHz / 160+80MHz / 80+160MHz band, in which case the phase rotation values ​​are defined and applied to the legacy preamble, the first and second signal fields. However, the 240MHz / 160+80MHz / 80+160MHz band is determined to be the band obtained by performing 80MHz-based preamble puncturing on the 320MHz / 160+160MHz band, and the phase rotation values ​​defined in the 320MHz / 160+160MHz band can be unified and used without defining separate phase rotation values ​​for the 240MHz / 160+80MHz / 80+160MHz band (unified technique).

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

[0534] The first signal field may include information for the first preamble puncturing pattern (or Punctured Channel Information). The first signal field may further include information for bandwidth and information for PPDU type and compression mode. The second signal field may include Resource Unit (RU) information. The transmitting STA can notify information for the tone plan at 160 / 240 / 320 MHz via the first and second signal fields. Furthermore, the EHT-STF, EHT-LTF, and data field are transmitted and received within the bandwidth (or RU) included in the broadband tone plan.

[0535] Figure 25 is a flowchart illustrating the procedure for receiving a PPDU in this embodiment.

[0536] An example shown in Figure 25 is implemented in a network environment that supports a next-generation wireless LAN system (IEEE 802.11be or EHT wireless LAN system). This next-generation wireless LAN system is an improved version of the 802.11ax system and can satisfy backward compatibility with the 802.11ax system.

[0537] An example shown in Figure 25 is implemented in a receiving STA and can be used with STAs that support EHT (Extremely High Throughput) wireless LAN systems. The transmitting STA in Figure 25 can be used with APs (access points).

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

[0539] In step S2510, the receiving STA (station) receives a PPDU (Physical Protocol Data Unit) from the transmitting STA via broadband.

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

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

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

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

[0544] This embodiment proposes a method for obtaining phase rotation values ​​by considering a limited preamble puncturing pattern, namely the first preamble puncturing pattern.

[0545] Since the broadband is 320 MHz or 160 + 160 MHz, the broadband can include first to fourth 80 MHz bands. The first to fourth 80 MHz bands are arranged in order from lower to higher frequencies and are contiguous with each other. The first preamble puncturing pattern can include first to eighth patterns.

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

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

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

[0549] The fifth to eighth patterns described above are patterns in which the 80MHz band is punctured in the broadband, and the first to fourth 80MHz bands themselves are punctured, while two or more 80MHz 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, we will explain the subcarrier range to which the phase rotation value is applied.

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

[0553] Of the first phase rotation values, the fifth 1 applies to subcarriers with subcarrier indices from -256 to -193, the sixth -1 applies to subcarriers with subcarrier indices from -192 to -129, the seventh -1 applies to subcarriers with subcarrier indices from -128 to -65, and the eighth -1 applies to subcarriers with subcarrier indices from -64 to -1.

[0554] Of the first phase rotation values, the 9th -1 applies to subcarriers with subcarrier indices from 0 to 63, the 10th 1 applies to subcarriers with subcarrier indices from 64 to 127, the 11th 1 applies to subcarriers with subcarrier indices from 128 to 191, and the 12th 1 applies to subcarriers with subcarrier indices from 192 to 255.

[0555] Of the first phase rotation values, the 13th -1 applies to subcarriers with subcarrier indices from 256 to 319, the 14th 1 applies to subcarriers with subcarrier indices from 320 to 383, the 15th 1 applies to subcarriers with subcarrier indices from 384 to 447, and the 16th 1 applies to subcarriers with subcarrier indices from 448 to 511.

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

[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 the phase rotation value for the 80MHz band as defined in an 802.11ax wireless LAN 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] ([1 -1 -1 -1] is repeated four times).

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

[0559] This embodiment proposes a method for performing additional phase rotation (third phase rotation value) in each 80MHz unit while repeatedly applying a phase rotation value (second phase rotation value) for an 80MHz band defined in an 802.11ax wireless LAN system.

[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. Of the third phase rotation value, the first 1 is applied to the first 80MHz band, the second 1 is applied to the second 80MHz band, the third -1 is applied to the third 80MHz band, and the fourth -1 is applied to the fourth 80MHz 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 to be [1 -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 L-LTF can be guaranteed for wideband transmission.

[0561] The above-described embodiment is the same when the PPDU is transmitted over the 240MHz / 160+80MHz / 80+160MHz band, in which case the phase rotation values ​​are defined and applied to the legacy preamble, the first and second signal fields. However, the 240MHz / 160+80MHz / 80+160MHz band is determined to be the band obtained by performing 80MHz-based preamble puncturing on the 320MHz / 160+160MHz band, and the phase rotation values ​​defined in the 320MHz / 160+160MHz band can be unified and used without defining separate phase rotation values ​​for the 240MHz / 160+80MHz / 80+160MHz band (unified technique).

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

[0563] The first signal field may include information for the first preamble puncturing pattern (or Punctured Channel Information). The first signal field may further include information for bandwidth and information for PPDU type and compression mode. The second signal field may include resource unit (RU) information. The transmitting STA can notify information for the tone plan at 160 / 240 / 320 MHz via the first and second signal fields. Furthermore, the EHT-STF, EHT-LTF, and data field are transmitted and received within the bandwidth (or RU) included in the broadband tone plan.

[0564] 5.Device configuration

[0565] The technical features of this specification described above are applicable to various devices and methods. For example, the technical features of this specification described above are implemented / supported through the device in Figure 1 and / or Figure 19. For example, the technical features of this specification described above are applicable only to parts of Figure 1 and / or Figure 19. For example, the technical features of this specification described above are implemented based on processing chips 114, 124 in Figure 1, or based on processors 111, 121 and memories 112, 122 in Figure 1, or based on processor 610 and memory 620 in Figure 19. For example, the device of this specification receives a PPDU (Physical Protocol Data Unit) from a transmitting STA via broadband and decodes the PPDU.

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

[0567] The CRM can store instructions for performing operations that include receiving a Physical Protocol Data Unit (PPDU) from a transmitting STA over broadband, and decoding the PPDU. Instructions stored in the CRM according to this specification are executed by at least one processor. The at least one processor associated with the CRM according to this specification is the processors 111, 121 or processing chips 114, 124 in Figure 1, or the processor 610 in Figure 19. On the other hand, the CRM according to this specification is the memory 112, 122 in Figure 1 or the memory 620 in Figure 19, or a separate external memory / storage medium / disk, etc.

[0568] The technical features described herein are applicable to a variety of applications and business models. For example, these technical features are applicable to wireless communication in devices that support artificial intelligence (AI).

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

[0570] An artificial neural network (ANN) is a model used in machine learning that consists of artificial neurons (nodes) that form a network of synaptic connections, and is generally considered to have problem-solving capabilities. An artificial neural network is defined by the connection patterns between neurons in other layers, the learning process that updates the model parameters, and the activation function that generates the 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 the artificial neural network can include synapses connecting neurons. In an artificial neural network, each neuron can output an input signal, a weighted value, and a function value of the activation function for the bias received via the synapse.

[0572] Model parameters refer to parameters determined through learning, including synaptic connection weights and neuron bias. Hyperparameters, on the other hand, refer to parameters that need to be set before learning in a machine learning algorithm, including the learning rate, iteration count, 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. The loss function is used as an indicator to determine the optimal model parameters during the training process of the artificial neural network.

[0574] Machine learning can be classified into supervised learning, unsupervised learning, and reinforcement learning based on the learning method.

[0575] Supervised learning refers to a method of training an artificial neural network when labels are provided for the training data. When labels are input to the artificial neural network, they represent the correct answer (or result value) that the artificial neural network needs to infer. Unsupervised learning refers to a method of training an artificial neural network when labels are not provided for the training data. Reinforcement learning refers to a learning method in which a defined agent is trained to select the action or sequence of actions that maximizes the cumulative reward in each state within a given environment.

[0576] Machine learning implemented as a deep neural network (DNN), which includes 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] Furthermore, the technical features described above can be applied to wireless communication for robots.

[0578] A robot is a machine that automatically processes or operates tasks assigned to it using its own capabilities. In particular, a robot that has the ability to perceive its environment, make decisions on its own, and perform actions is called an intelligent robot.

[0579] Robots can be classified into industrial, medical, household, and military categories depending on their intended use and field. Robots are equipped with drive units, including actuators or motors, and can perform various physical actions, such as moving robotic joints. Mobile robots also include drive units with wheels, brakes, propellers, etc., and can travel on the ground or fly through the air via these drive units.

[0580] Furthermore, the technical features described above apply to devices that support augmented reality.

[0581] Augmented reality is a general term encompassing virtual reality (VR), augmented reality (AR), and mixed reality (MR). VR technology provides real-world objects and backgrounds solely as computer graphics (CG) images, AR technology provides virtual CG images alongside images of real objects, and MR technology is a computer graphics technology that mixes and combines virtual objects with the real world.

[0582] Mixed Reality (MR) technology is similar to augmented reality (AR) technology in that it displays virtual objects together. However, while AR uses virtual objects to complement other virtual objects, MR uses virtual objects in a way that they are equivalent in nature.

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

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

Claims

1. In a method for a WLAN (wireless local area network) system, The receiving STA (station) receives a PPDU (Physical Protocol Data Unit) from the transmitting STA, The receiving STA includes the step of decoding the PPDU, The PPDU includes L-STF (Legacy-Short Training Field), L-LTF (legacy-long training field), L-SIG (legacy-signal), RL-SIG (repeated legacy-signal), U-SIG (universal-signal), EHT-SIG (extremely high throughput-signal), EHT-STF, EHT-LTF, and a data field. The U-SIG includes a version-independent field and a subsequent version-dependent field. The length of the U-SIG is two OFDM (orthogonal frequency division multiplexing) symbols. The bandwidth of the PPDU is 320 MHz, and a pattern is defined in which 40 MHz or 80 MHz is punctured within the bandwidth of the PPDU. The fields that are independent of the aforementioned version include the BW (bandwidth) field, The field dependent on the aforementioned version includes a Punctured Channel Information field which contains a 4-bit bitmap indicating which 20 MHz subchannels are punctured in the 80 MHz frequency subblock, The aforementioned pattern relates to the BW field and the 4-bit bitmap, The aforementioned 4-bit bitmap is indexed in ascending order in units of the 20MHz subchannel, For each bit in the aforementioned 4-bit bitmap, a value of 0 indicates that the 20MHz subchannel associated with the bit is punctured, and a value of 1 indicates that the 20MHz subchannel associated with the bit is not punctured. The values ​​of the 4-bit bitmap for the 80 MHz frequency subblock are defined as 1111, 0111, 1011, 1101, 1110, 0011, 1100, and 1001. The first phase rotation value is applied to the L-STF, L-LTF, L-SIG, RL-SIG, U-SIG, and EHT-SIG. The first phase rotation value of the above-mentioned device is [1 -1 -1 -1 1 -1 -1 -1 -1 -1 -1 1 1 1 -1 1 1 1], One element of the first phase rotation value is a phase rotation value applied to each 20 MHz band in the 320 MHz band, The first of the first phase rotation values ​​is applied to a subcarrier having a subcarrier index of -512 to -449, The second -1 of the first phase rotation value applies to subcarriers having subcarrier indices from -448 to -385. The third -1 of the aforementioned first phase rotation value applies to subcarriers having subcarrier indices from -384 to -321. The fourth -1 of the aforementioned first phase rotation value applies to subcarriers having subcarrier indices from -320 to -257. The fifth of the first phase rotation values ​​is applied to subcarriers having subcarrier indices from -256 to -193. The sixth -1 of the aforementioned first phase rotation value applies to subcarriers having subcarrier indices from -192 to -129. The seventh -1 of the first phase rotation value applies to subcarriers having subcarrier indices from -128 to -65. The eighth -1 of the first phase rotation value applies to subcarriers having subcarrier indices from -64 to -1. The ninth of the first phase rotation values, -1, is applied to subcarriers having subcarrier indices from 0 to 63. The tenth of the first phase rotation values ​​is applied to subcarriers having subcarrier indices from 64 to 127. The 11th of the first phase rotation value is applied to subcarriers having subcarrier indices from 128 to 191. The twelfth of the first phase rotation value is applied to a subcarrier having subcarrier indices 192 to 255, The thirteenth of the first phase rotation values, -1, is applied to subcarriers having subcarrier indices from 256 to 319. The 14th of the aforementioned first phase rotation values ​​is applied to subcarriers having subcarrier indices from 320 to 383. The 15th of the first phase rotation values ​​is applied to subcarriers having subcarrier indices from 384 to 447. The 16th of the first phase rotation values ​​is applied to a subcarrier having subcarrier indices 448 to 511.

2. The bandwidth of the PPDU includes first to fourth 80 MHz bands, The pattern in which 40 MHz or 80 MHz is punctured in the bandwidth of the PPDU includes the first to eighth patterns. The first pattern is a pattern in which the 40 MHz band within the first 80 MHz band of the PPDU is punctured within the bandwidth of the PPDU. The second pattern is a pattern in which the 40 MHz band within the second 80 MHz band of the PPDU is punctured within the bandwidth of the PPDU. The third pattern is a pattern in which the 40 MHz band within the third 80 MHz band of the PPDU is punctured within the bandwidth of the PPDU. The fourth pattern is a pattern in which the 40 MHz band within the fourth 80 MHz band of the PPDU is punctured within the bandwidth of the PPDU. The fifth pattern is a pattern in which the first 80 MHz band is punctured in the bandwidth of the PPDU, The sixth pattern is a pattern in which the second 80 MHz band is punctured within the bandwidth of the PPDU, The seventh pattern is a pattern in which the third 80 MHz band is punctured in the bandwidth of the PPDU, The method according to claim 1, wherein the eighth pattern is a pattern in which the fourth 80 MHz band is punctured in the bandwidth of the PPDU.

3. The method according to claim 1, wherein the 320 MHz band is composed of subcarriers having subcarrier indices from -512 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 the phase rotation value for the 80 MHz band as defined in an 802.11ax wireless LAN system. The method according to claim 2, wherein the third phase rotation value is a phase rotation value defined in units of the 80 MHz bandwidth in order to obtain the optimal PAPR (Peak-to-Average Power Ratio) of the L-STF and the L-LTF.

5. The second phase rotation value of the above-mentioned device is [1 -1 -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 according to claim 4, wherein the first phase rotation value is obtained based on the product of the second phase rotation value and the third phase rotation value.

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

7. The U-SIG includes information regarding the preamble puncturing pattern, The method according to claim 1, wherein the contents of the U-SIG are identical in all uncropped 20 MHz subchannels.

8. In a WLAN (wireless local area network) system, at the receiving STA (station), Memory and Transmitter and receiver, The system comprises the memory and a processor coupled to the transceiver so as to be operable, The aforementioned processor, Receive a PPDU (Physical Protocol Data Unit) from the transmitting STA. It is configured to decode the aforementioned PPDU, The PPDU includes L-STF (Legacy-Short Training Field), L-LTF (legacy-long training field), L-SIG (legacy-signal), RL-SIG (repeated legacy-signal), U-SIG (universal-signal), EHT-SIG (extremely high throughput-signal), EHT-STF, EHT-LTF, and a data field. The U-SIG includes a version-independent field and a subsequent version-dependent field. The length of the U-SIG is two OFDM (orthogonal frequency division multiplexing) symbols. The bandwidth of the PPDU is 320 MHz, and a pattern is defined in which 40 MHz or 80 MHz is punctured within the bandwidth of the PPDU. The fields that are independent of the aforementioned version include the BW (bandwidth) field, The field dependent on the aforementioned version includes a Punctured Channel Information field which contains a 4-bit bitmap indicating which 20 MHz subchannels are punctured in the 80 MHz frequency subblock, The aforementioned pattern relates to the BW field and the 4-bit bitmap, The aforementioned 4-bit bitmap is indexed in ascending order in units of the 20MHz subchannel, For each bit in the aforementioned 4-bit bitmap, a value of 0 indicates that the 20MHz subchannel associated with the bit is punctured, and a value of 1 indicates that the 20MHz subchannel associated with the bit is not punctured. The values ​​of the 4-bit bitmap for the 80 MHz frequency subblock are defined as 1111, 0111, 1011, 1101, 1110, 0011, 1100, and 1001. The first phase rotation value is applied to the L-STF, L-LTF, L-SIG, RL-SIG, U-SIG, and EHT-SIG. The first phase rotation value of the above-mentioned device is [1 -1 -1 -1 1 -1 -1 -1 -1 -1 -1 1 1 1 -1 1 1 1], One element of the first phase rotation value is a phase rotation value applied to each 20 MHz band in the 320 MHz band, The first of the first phase rotation values ​​is applied to a subcarrier having a subcarrier index of -512 to -449, The second -1 of the first phase rotation value applies to subcarriers having subcarrier indices from -448 to -385. The third -1 of the aforementioned first phase rotation value applies to subcarriers having subcarrier indices from -384 to -321. The fourth -1 of the aforementioned first phase rotation value applies to subcarriers having subcarrier indices from -320 to -257. The fifth of the first phase rotation values ​​is applied to subcarriers having subcarrier indices from -256 to -193. The sixth -1 of the aforementioned first phase rotation value applies to subcarriers having subcarrier indices from -192 to -129. The seventh -1 of the first phase rotation value applies to subcarriers having subcarrier indices from -128 to -65. The eighth -1 of the first phase rotation value applies to subcarriers having subcarrier indices from -64 to -1. The ninth of the first phase rotation values, -1, is applied to subcarriers having subcarrier indices from 0 to 63. The tenth of the first phase rotation values ​​is applied to subcarriers having subcarrier indices from 64 to 127. The 11th of the first phase rotation value is applied to subcarriers having subcarrier indices from 128 to 191. The twelfth of the first phase rotation value is applied to a subcarrier having subcarrier indices 192 to 255, The thirteenth of the first phase rotation values, -1, is applied to subcarriers having subcarrier indices from 256 to 319. The 14th of the aforementioned first phase rotation values ​​is applied to subcarriers having subcarrier indices from 320 to 383. The 15th of the first phase rotation values ​​is applied to subcarriers having subcarrier indices from 384 to 447. The sixteenth of the first phase rotation values ​​is applied to the receiving STA, which has subcarriers having subcarrier indices 448 to 511.

9. In a method for a WLAN (wireless local area network) system, The transmitting STA (station) generates a PPDU (Physical Protocol Data Unit), The transmitting STA includes the step of transmitting the PPDU to the receiving STA, The PPDU includes L-STF (Legacy-Short Training Field), L-LTF (legacy-long training field), L-SIG (legacy-signal), RL-SIG (repeated legacy-signal), U-SIG (universal-signal), EHT-SIG (extremely high throughput-signal), EHT-STF, EHT-LTF, and a data field. The U-SIG includes a version-independent field and a subsequent version-dependent field. The length of the U-SIG is two OFDM (orthogonal frequency division multiplexing) symbols. The bandwidth of the PPDU is 320 MHz, and a pattern is defined in which 40 MHz or 80 MHz is punctured within the bandwidth of the PPDU. The fields that are independent of the aforementioned version include the BW (bandwidth) field, The field dependent on the aforementioned version includes a Punctured Channel Information field which contains a 4-bit bitmap indicating which 20 MHz subchannels are punctured in the 80 MHz frequency subblock, The aforementioned pattern relates to the BW field and the 4-bit bitmap, The aforementioned 4-bit bitmap is indexed in ascending order in units of the 20MHz subchannel, For each bit in the aforementioned 4-bit bitmap, a value of 0 indicates that the 20MHz subchannel associated with the bit is punctured, and a value of 1 indicates that the 20MHz subchannel associated with the bit is not punctured. The values ​​of the 4-bit bitmap for the 80 MHz frequency subblock are defined as 1111, 0111, 1011, 1101, 1110, 0011, 1100, and 1001. The first phase rotation value is applied to the L-STF, L-LTF, L-SIG, RL-SIG, U-SIG, and EHT-SIG. The first phase rotation value of the above-mentioned device is [1 -1 -1 -1 1 -1 -1 -1 -1 -1 -1 1 1 1 -1 1 1 1], One element of the first phase rotation value is a phase rotation value applied to each 20 MHz band in the 320 MHz band, The first of the first phase rotation values ​​is applied to a subcarrier having a subcarrier index of -512 to -449, The second -1 of the first phase rotation value applies to subcarriers having subcarrier indices from -448 to -385. The third -1 of the aforementioned first phase rotation value applies to subcarriers having subcarrier indices from -384 to -321. The fourth -1 of the aforementioned first phase rotation value applies to subcarriers having subcarrier indices from -320 to -257. The fifth of the first phase rotation values ​​is applied to subcarriers having subcarrier indices from -256 to -193. The sixth -1 of the aforementioned first phase rotation value applies to subcarriers having subcarrier indices from -192 to -129. The seventh -1 of the first phase rotation value applies to subcarriers having subcarrier indices from -128 to -65. The eighth -1 of the first phase rotation value applies to subcarriers having subcarrier indices from -64 to -1. The ninth of the first phase rotation values, -1, is applied to subcarriers having subcarrier indices from 0 to 63. The tenth of the first phase rotation values ​​is applied to subcarriers having subcarrier indices from 64 to 127. The 11th of the first phase rotation value is applied to subcarriers having subcarrier indices from 128 to 191. The twelfth of the first phase rotation value is applied to a subcarrier having subcarrier indices 192 to 255, The thirteenth of the first phase rotation values, -1, is applied to subcarriers having subcarrier indices from 256 to 319. The 14th of the aforementioned first phase rotation values ​​is applied to subcarriers having subcarrier indices from 320 to 383. The 15th of the first phase rotation values ​​is applied to subcarriers having subcarrier indices from 384 to 447. The 16th of the first phase rotation values ​​is applied to a subcarrier having subcarrier indices 448 to 511.

10. The bandwidth of the PPDU includes first to fourth 80 MHz bands, The pattern in which 40 MHz or 80 MHz is punctured in the bandwidth of the PPDU includes the first to eighth patterns. The first pattern is a pattern in which the 40 MHz band within the first 80 MHz band of the PPDU is punctured within the bandwidth of the PPDU. The second pattern is a pattern in which the 40 MHz band within the second 80 MHz band of the PPDU is punctured within the bandwidth of the PPDU. The third pattern is a pattern in which the 40 MHz band within the third 80 MHz band of the PPDU is punctured within the bandwidth of the PPDU. The fourth pattern is a pattern in which the 40 MHz band within the fourth 80 MHz band of the PPDU is punctured within the bandwidth of the PPDU. The fifth pattern is a pattern in which the first 80 MHz band is punctured in the bandwidth of the PPDU, The sixth pattern is a pattern in which the second 80 MHz band is punctured within the bandwidth of the PPDU, The seventh pattern is a pattern in which the third 80 MHz band is punctured in the bandwidth of the PPDU, The method according to claim 9, wherein the eighth pattern is a pattern in which the fourth 80 MHz band is punctured in the bandwidth of the PPDU.

11. The method according to claim 9, wherein the 320 MHz band is composed of subcarriers having subcarrier indices from -512 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 the phase rotation value for the 80 MHz band as defined in an 802.11ax wireless LAN system. The method according to claim 10, wherein the third phase rotation value is a phase rotation value defined in units of the 80 MHz bandwidth in order to obtain the optimal PAPR (Peak-to-Average Power Ratio) of the L-STF and the L-LTF.

13. The second phase rotation value of the above-mentioned device is [1 -1 -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 according to claim 12, wherein the first phase rotation value is obtained based on the product of the second phase rotation value and the third phase rotation value.

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

15. The U-SIG includes information regarding the preamble puncturing pattern, The method according to claim 9, wherein the contents of the U-SIG are identical in all uncropped 20 MHz subchannels.

16. In a WLAN (wireless local area network) system, at the transmitting STA (station), Memory and Transmitter and receiver, The system comprises the memory and a processor coupled to the transceiver so as to be operable, The aforementioned processor, Generate a PPDU (Physical Protocol Data Unit), The system is configured to transmit the PPDU to the receiving STA. The PPDU includes L-STF (Legacy-Short Training Field), L-LTF (legacy-long training field), L-SIG (legacy-signal), RL-SIG (repeated legacy-signal), U-SIG (universal-signal), EHT-SIG (extremely high throughput-signal), EHT-STF, EHT-LTF, and a data field. The U-SIG includes a version-independent field and a subsequent version-dependent field. The length of the U-SIG is two OFDM (orthogonal frequency division multiplexing) symbols. The bandwidth of the PPDU is 320 MHz, and a pattern is defined in which 40 MHz or 80 MHz is punctured within the bandwidth of the PPDU. The fields that are independent of the aforementioned version include the BW (bandwidth) field, The field dependent on the aforementioned version includes a Punctured Channel Information field which contains a 4-bit bitmap indicating which 20 MHz subchannels are punctured in the 80 MHz frequency subblock, The aforementioned pattern relates to the BW field and the 4-bit bitmap, The aforementioned 4-bit bitmap is indexed in ascending order in units of the 20MHz subchannel, For each bit in the aforementioned 4-bit bitmap, a value of 0 indicates that the 20MHz subchannel associated with the bit is punctured, and a value of 1 indicates that the 20MHz subchannel associated with the bit is not punctured. The values ​​of the 4-bit bitmap for the 80 MHz frequency subblock are defined as 1111, 0111, 1011, 1101, 1110, 0011, 1100, and 1001. The first phase rotation value is applied to the L-STF, L-LTF, L-SIG, RL-SIG, U-SIG, and EHT-SIG. The first phase rotation value of the above-mentioned device is [1 -1 -1 -1 1 -1 -1 -1 -1 -1 -1 1 1 1 -1 1 1 1], One element of the first phase rotation value is a phase rotation value applied to each 20 MHz band in the 320 MHz band, The first of the first phase rotation values ​​is applied to a subcarrier having a subcarrier index of -512 to -449, The second -1 of the first phase rotation value applies to subcarriers having subcarrier indices from -448 to -385. The third -1 of the aforementioned first phase rotation value applies to subcarriers having subcarrier indices from -384 to -321. The fourth -1 of the aforementioned first phase rotation value applies to subcarriers having subcarrier indices from -320 to -257. The fifth of the first phase rotation values ​​is applied to subcarriers having subcarrier indices from -256 to -193. The sixth -1 of the aforementioned first phase rotation value applies to subcarriers having subcarrier indices from -192 to -129. The seventh -1 of the first phase rotation value applies to subcarriers having subcarrier indices from -128 to -65. The eighth -1 of the first phase rotation value applies to subcarriers having subcarrier indices from -64 to -1. The ninth of the first phase rotation values, -1, is applied to subcarriers having subcarrier indices from 0 to 63. The tenth of the first phase rotation values ​​is applied to subcarriers having subcarrier indices from 64 to 127. The 11th of the first phase rotation value is applied to subcarriers having subcarrier indices from 128 to 191. The twelfth of the first phase rotation value is applied to a subcarrier having subcarrier indices 192 to 255, The thirteenth of the first phase rotation values, -1, is applied to subcarriers having subcarrier indices from 256 to 319. The 14th of the aforementioned first phase rotation values ​​is applied to subcarriers having subcarrier indices from 320 to 383. The 15th of the first phase rotation values ​​is applied to subcarriers having subcarrier indices from 384 to 447. The sixteenth of the first phase rotation values ​​is applied to the transmit STA, which has subcarrier indices 448 to 511.

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