Signaling method by resource allocation in wireless communication system and wireless communication terminal

Abstract

Disclosed are a signaling method by resource allocation in a wireless communication system and a wireless communication terminal. A terminal may receive a physical protocol data unit (physical layer protocol data unit: PPDU) from an access point (APAP) and decode the received PPDU. The PPDU may include a Universal Signal (U-SIG) field and an Extreme High Throughput (EHT)-SIG field including at least one content channel, and the U-SIG field may include a bandwidth field indicating a total bandwidth through which the PPDU is transmitted. The total bandwidth is divided into at least one segment, and when the at least one content channel is composed of a first content channel and a second content channel, at least one of the same fields other than a resource unit allocation (RU allocation) field between the first content channel and the second content channel in the same one of the at least one segment includes the same information.

Description

[0001] This application is a divisional application of the patent application with application number 202080084351.9 (PCT / KR2020 / 017733), which was submitted to the China Patent Office on June 6, 2022, with an international application date of December 7, 2020, and the invention name is "Signaling method and wireless communication terminal through resource allocation in a wireless communication system". Technical Field

[0002] The present invention relates to a wireless communication system, and more particularly, to a method and device for transmitting information for allocating discontinuous channels in the wireless communication system. Background Art

[0003] In recent years, as the supply of mobile devices has expanded, wireless LAN technology that can provide fast wireless Internet services to mobile devices has received attention. Wireless LAN technology allows mobile devices including smart phones, smart tablets, laptops, portable multimedia players, embedded devices, etc. to wirelessly access the Internet in homes or companies or specific service provision areas based on short-range wireless communication technology.

[0004] Since the use of 2.4GHz frequency to support the initial wireless LAN technology, the Institute of Electrical and Electronics Engineers (IEEE) 802.11 has been commercialized or developed various technical standards. First, IEEE 802.11b supports a maximum communication speed of 11Mbps when using the frequency of the 2.4GHz band. Compared with the frequency of the 2.4GHz band that is significantly congested, the IEEE 802.11a commercialized after IEEE802.11b uses a frequency of the 5GHz band instead of the 2.4GHz band to reduce the impact of interference, and by using OFDM technology, the communication speed is increased to a maximum of 54Mbps. However, the disadvantage of IEEE 802.11a is that the communication distance is shorter than that of IEEE 802.11b. In addition, similar to IEEE 802.11b, IEEE 802.11g uses the frequency of the 2.4GHz band to achieve a maximum communication speed of 54Mbps and meets backward compatibility to significantly cause concern, and further, in terms of communication distance, it is superior to IEEE 802.11a.

[0005] In addition, as a technical standard established to overcome the limitation of communication speed pointed out as a weakness in wireless LAN, IEEE 802.11n has been provided. IEEE 802.11n aims to improve the speed and reliability of the network and extend the working distance of the wireless network. In more detail, IEEE 802.11n supports high throughput (HT), wherein the data processing speed is a maximum of 540Mbps or higher, and further, based on multiple input and multiple output (MIMO) technology, wherein multiple antennas are used on both sides of the transmitting unit and the receiving unit to minimize transmission errors and optimize data speed. In addition, the standard can use a coding scheme that sends multiple copies superimposed on each other in order to increase data reliability.

[0006] With the provision of activated wireless LANs, and further, with the diversification of applications using wireless LANs, the demand for new wireless LAN systems supporting higher throughput (very high throughput (VHT)) than the data processing speed supported by IEEE 802.11n has attracted attention. Among them, IEEE 802.11ac supports a wide bandwidth (80 to 160 MHz) in the 5 GHz frequency. The IEEE 802.11ac standard is defined only in the 5 GHz band, but the initial 11ac chipset even supports operation in the 2.4 GHz band for backward compatibility with existing 2.4 GHz band products. In theory, according to the standard, the wireless LAN speed of multiple stations can be enabled to reach a minimum of 1 Gbps, and the maximum single link speed can be enabled to reach a minimum of 500 Mbps. This is achieved by extending the concept of the wireless interface accepted by 802.11n, such as a wider wireless frequency bandwidth (maximum 160 MHz), more MIMO spatial streams (maximum 8), multi-user MIMO, and high-density modulation (maximum 256 QAM). In addition, as a scheme for transmitting data by using a 60 GHz band instead of the existing 2.4 GHz / 5 GHz, IEEE 802.11ad has been provided. IEEE 802.11ad is a transmission standard that provides a maximum speed of 7 Gbps by using a beamforming technology, and is suitable for high bit rate moving image streams such as large-scale data or non-compressed HD video. However, since the 60 GHz band is difficult to pass through obstacles, it has a disadvantage in that the 60 GHz band can be used only among devices in a close space.

[0007] As a wireless LAN standard following 802.11ac and 802.11ad, the IEEE 802.11ax (High-Efficiency WLAN, HEW) standard for providing efficient and high-performance wireless LAN communication technology in a high-density environment where APs and terminals are concentrated is in the development completion stage. In a wireless LAN environment based on 802.11ax, communication with high-frequency efficiency should be provided indoors / outdoors in the presence of high-density stations and access points (APs), and various technologies for achieving such communication have been developed.

[0008] In order to support new multimedia applications such as high-definition video and real-time gaming, new wireless LAN standards have been developed to increase the maximum transmission rate. In IEEE 802.11be (Extremely High Throughput, EHT), which is the 7th generation wireless LAN standard, the standard is being developed with the goal of supporting transmission rates up to 30 Gbps in the 2.4 / 5 / 6 GHz band through wider bandwidth, increased spatial streams, multi-AP collaboration, etc. Summary of the invention

[0009] Technical issues

[0010] As described above, one aspect of the present invention is to provide high-speed wireless LAN services for new multimedia applications.

[0011] One aspect of the present invention is to provide a resource allocation method and device, which are used to allocate discontinuous channels to a terminal when allocating resources to the terminal.

[0012] One aspect of the present invention is to provide a data format for providing a terminal with information for identifying discontinuously allocated resources when allocating resources to a plurality of terminals.

[0013] The technical tasks to be achieved in the specification are not limited to the technical tasks mentioned above, and those skilled in the art can clearly understand other technical tasks not mentioned based on the following description.

[0014] Technical Solution

[0015] A terminal that transmits a physical uplink shared channel (PUSCH) to a base station in a wireless communication system: receives a physical protocol data unit (physical layer protocol data unit: PPDU) from an access point (AP) and decodes the received PPDU, wherein: the PPDU includes a universal signal (U-SIG) field and an extremely high throughput (EHT)-SIG field including at least one content channel; the PPDU is a PPDU sent by the AP to multiple terminals through a multi-user (MU) transmission operation; the U-SIG field includes a bandwidth field indicating a total bandwidth in which the PPDU is sent; the total bandwidth is divided into at least one segment; and when at least one content channel consists of a first content channel and a second content channel, at least one of the same fields in the same segment in the at least one segment, except for a resource unit allocation (RU allocation) field between the first content channel and the second content channel, includes the same information.

[0016] In the present invention, at least one field includes at least one of a low density parity check code (LDPC) additional symbol segmentation field, a space time block coding (STBC) field, a pre-FEC filling factor field, or a GI+long training field (LTF) size field.

[0017] In the present invention, at least one segment includes a first segment and a second segment, and each of the first content channel and the second content channel is repeatedly transmitted in each predetermined frequency band within the first segment or the second segment.

[0018] In the present invention, at least one content channel transmitted in a first segment and at least one content channel transmitted in a second segment having the same index include different information.

[0019] In the present invention, if the first content channel and the second content channel are sent in the first segment, and the first content channel and the second content channel are sent in the second segment, the first content channel and the second content channel sent in the first segment and the first content channel and the second content channel sent in the second segment are repeatedly sent at a predetermined frequency interval.

[0020] In the present invention, the first and second content channels sent in the first segment include a first common field, the first common field includes at least one field containing the same value, and the first content channel and the second content channel sent in the second segment include a second common field, the second common field includes at least one field containing the same value.

[0021] In the present invention, at least one field included in the first common field and at least one field included in the second common field include different information.

[0022] In the present invention, a value of a U-SIG field and / or an EHT-SIG field of a PPDU transmitted in a first segment is different from a value of a U-SIG field and / or an EHT-SIG field of a PPDU transmitted in a second segment.

[0023] In the present invention, the PPDU further includes puncturing information indicating a puncturing pattern of at least one resource unit allocated to the terminal.

[0024] In the present invention, at least one resource unit is identified by a terminal based on a combination of at least one of puncturing information, a resource unit allocation field, and a station identifier (STA ID) field, wherein the resource unit allocation field indicates the configuration of the resource unit via which the PPDU is sent, and the STA ID field indicates the ID of the terminal to which each resource unit is allocated based on the configuration of the resource unit.

[0025] In the present invention, if a plurality of resource units are allocated to a terminal, the plurality of resource units include the same or different numbers of tones, and the plurality of resource units are allocated discontinuously.

[0026] In the present invention, the EHT-SIG field includes a common field, and the U-SIG field includes a specific field related to whether a resource unit allocation field for resource unit allocation is included in the EHT-SIG field.

[0027] In the present invention, if a specific field indicates that non-OFDMA is applied, the resource unit allocation field is not included in the EHT-SIG.

[0028] The present invention provides a method, which includes: receiving a physical protocol data unit (physical layer protocol data unit: PPDU) from an access point (AP); decoding the received PPDU, wherein: the PPDU includes a universal signal (U-SIG) field and an extremely high throughput (EHT)-SIG field including at least one content channel; the PPDU is a PPDU sent by the AP to multiple terminals through a multi-user (MU) transmission operation; the U-SIG field includes a bandwidth field indicating a total bandwidth in which the PPDU is sent; the total bandwidth is divided into at least one segment; when at least one content channel consists of a first content channel and a second content channel, at least one of the same fields in the same segment in the at least one segment except a resource unit allocation (RU allocation) field between the first content channel and the second content channel includes the same information.

[0029] Beneficial Effects

[0030] According to the embodiments of the present invention, discontinuous channel allocation information can be effectively signaled.

[0031] According to the embodiments of the present invention, in a contention-based channel access system, the overall resource utilization rate can be improved and the performance of the WLAN system can be improved.

[0032] According to an embodiment of the present invention, by notifying a terminal of information for identifying discontinuously allocated resources, the terminal can effectively identify allocated resources in order to receive data.

[0033] According to an embodiment of the present invention, if data is transmitted to a plurality of terminals, information common to each terminal is transmitted via the same packet format, thereby reducing signaling overhead.

[0034] Effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood from the following description by those skilled in the art to which the present invention pertains. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A wireless LAN system according to an embodiment of the present invention is illustrated.

[0036] Figure 2 A wireless LAN system according to another embodiment of the present invention is shown.

[0037] Figure 3 The configuration of a station according to an embodiment of the present invention is illustrated.

[0038] Figure 4 The diagram illustrates a configuration of an access point according to an embodiment of the present invention.

[0039] Figure 5 The process of setting up a link between a STA and an AP is schematically illustrated.

[0040] Figure 6 The diagram shows a carrier sense multiple access (CSMA) / collision avoidance (CA) method used in wireless LAN communications.

[0041] Figure 7 Examples of the format of a PLCP protocol data unit (PPDU) for each of the various standard generations are illustrated.

[0042] Figure 8 Examples of various extremely high throughput (EHT) physical protocol data unit (PPDU) formats and a method for indicating the formats according to an embodiment of the present invention are illustrated.

[0043] Fig. 9 An example of a coding structure and a transmission method of an EHT-SIG field according to an embodiment of the present invention is illustrated.

[0044] Fig.10 Examples of various BW modes of the EHT SU PPDU are illustrated.

[0045] Fig.11 Illustrated is the RU allocation distribution for each of 20MHz, 40MHz, and 80MHz used in 11ax and 11be.

[0046] Fig.12 An example of a BW mode of an EHT MU PPDU is illustrated.

[0047] Fig.13 An example of discontinuous channel types based on a BW usage rate rule according to an embodiment of the present invention is illustrated.

[0048] Fig.14 An example of discontinuous channel types based on puncture resolution according to an embodiment of the present invention is illustrated.

[0049] Fig.15 An example of discontinuous channel types based on the number of RUs to be decoded according to an embodiment of the present invention is illustrated.

[0050] Fig.16 An example of a PPDU format in a discontinuous channel according to an embodiment of the present invention is illustrated.

[0051] Fig.17 An example of discontinuous channels divided according to frequency division according to an embodiment of the present invention is illustrated.

[0052] Fig.18 An example of a discontinuous channel for single-user transmission according to an embodiment of the present invention is illustrated.

[0053] Fig.19 An example of discontinuous channels for a specific bandwidth according to an embodiment of the present invention is illustrated.

[0054] Fig. 20 An example of a PPDU format of an extremely high throughput (EHT) wireless LAN according to an embodiment of the present invention is illustrated.

[0055] Fig.21 An embodiment of a U-SIG field of an EHT PPDU and fields constituting the U-SIG field according to an embodiment of the present invention is illustrated.

[0056] Fig. 22 An embodiment of an uncompressed type EHT-SIG according to an embodiment of the present invention is illustrated.

[0057] Fig.23 An example of resource unit configuration based on a field for allocating resource units according to an embodiment of the present invention is illustrated.

[0058] Fig.24An example of an EHG-SIG field when a non-OFDMA PPDU is applied according to an embodiment of the present invention is illustrated.

[0059] Fig.25 An example of an EHT-SIG field when a single user (SU) PPDU is applied according to an embodiment of the present invention is illustrated.

[0060] Fig.26 An embodiment of large resource unit (RU) allocation according to an embodiment of the present invention is illustrated.

[0061] Fig. 27 An embodiment of single content channel signaling for OFDMA MU PPDU according to an embodiment of the present invention is illustrated.

[0062] Fig.28 An embodiment of two content channel signaling for a specific frequency band according to an embodiment of the present invention is illustrated.

[0063] Fig.29 Another embodiment of two content channel signaling for a specific frequency band according to an embodiment of the present invention is illustrated.

[0064] Fig.30 Another embodiment of two content channel signaling for a specific frequency band according to an embodiment of the present invention is illustrated.

[0065] Fig.31 and Fig.32 An embodiment of four content channels of an OFDMA MU PPDU for a specific frequency band according to an embodiment of the present invention is illustrated.

[0066] Fig.33 Another embodiment of four content channel signaling for a specific frequency band according to an embodiment of the present invention is illustrated.

[0067] Fig.34 An example of a method of configuring resource units of different sizes according to an embodiment of the present invention is illustrated.

[0068] Fig.35 Another example of a method of configuring resource units of different sizes according to an embodiment of the present invention is illustrated.

[0069] Fig.36 An example of an EHT-SIG repeated within a bandwidth when a content channel is signaled according to an embodiment of the present invention is illustrated.

[0070] Fig.37 illustrates another example of EHT-SIG repeated within a bandwidth when signaling a content channel according to an embodiment of the present invention; and

[0071] Fig.38is a flowchart illustrating an example of a method for receiving a PPDU by a terminal according to an embodiment of the present invention. DETAILED DESCRIPTION

[0072] By considering the functions of the present invention, the terms used in this specification adopt the common terms widely used at present, but the terms can be changed according to the intentions, habits and emergence of new technologies of those skilled in the art. In addition, in specific cases, there are terms arbitrarily selected by the applicant, and in this case, their meanings will be described in the corresponding description part of the present invention. Therefore, it should be understood that the terms used in this specification will not only be analyzed based on the name of the term, but also based on the essential meaning of the term and the content of the entire specification.

[0073] Throughout this specification and the claims that follow, when describing an element as being "coupled" to another element, the element may be "directly coupled" to the other element, or "electrically coupled" to the other element via a third element. In addition, unless explicitly described to the contrary, the word "comprising" will be understood to implicitly include the stated elements, but not to exclude any other elements. In addition, limitations such as "or above" or "or below" based on specific thresholds may be appropriately replaced with "greater than" or "less than", respectively.

[0074] Hereinafter, in the present invention, field and subfield may be used interchangeably.

[0075] Figure 1 A wireless LAN system according to an embodiment of the present invention is illustrated.

[0076] Figure 1 1 is a diagram illustrating a wireless LAN system according to an embodiment of the present invention. The wireless LAN system includes one or more basic service sets (BSSs), and the BSS represents a collection of devices that are successfully synchronized with each other to communicate with each other. Generally, the BSS can be divided into an infrastructure BSS and an independent BSS (IBSS), and Figure 1 The diagram shows the basic structure BSS between them.

[0077] like Figure 1 As shown, the infrastructure BSS (BSS1 and BSS2) includes one or more stations STA1, STA2, STA3, STA4 and STA5, access points AP-1 and AP-2 as stations providing distributed services, and a distributed system (DS) connecting multiple access points AP-1 and AP-2.

[0078] A station (STA) is a predetermined device including a media access control (MAC) and a physical layer interface for a wireless medium in accordance with the provisions of the IEEE 802.11 standard, and broadly includes both non-access point (non-AP) stations and access points (APs). In addition, in this specification, the term "terminal" may be used to refer to a non-AP STA, or an AP, or both terms. A station for wireless communication includes a processor and a communication unit, and may further include a user interface unit and a display unit according to an embodiment. The processor may generate a frame to be sent via a wireless network, or process a frame received via a wireless network, and further, perform various processes for controlling the station. In addition, the communication unit is functionally connected to the processor, and sends and receives frames via a wireless network for the station. According to the present invention, a terminal may be used as a term including a user equipment (UE).

[0079] An access point (AP) is an entity that provides access to a distributed system (DS) via a wireless medium for stations associated therewith. In an infrastructure BSS, communication among non-AP stations is performed via an AP in principle, but when a direct link is configured, direct communication is even allowed among non-AP stations. Meanwhile, in the present invention, AP is used as a concept including a personal BSS coordination point (PCP), and in a broad sense may include concepts including a central controller, a base station (BS), a node B, a base transceiver system (BTS), and a site controller. In the present invention, AP may also be referred to as a base station wireless communication terminal. The base station wireless communication terminal may be used as a term that broadly includes AP, base station, eNB (i.e., eNode B), and transmission point (TP). In addition, the base station wireless communication terminal may include various types of wireless communication terminals that allocate media resources and perform scheduling for communication with multiple wireless communication terminals.

[0080] Multiple infrastructure BSSs may be connected to each other via a distribution system (DS). In this case, multiple BSSs connected via a distribution system are called an extended service set (ESS).

[0081] Figure 2 The figure shows an independent BSS according to another embodiment of the present invention, which is a wireless LAN system. Figure 2 In the embodiment, Figure 1 Same as or corresponding to Figure 1 Repetitive description of parts of the embodiments will be omitted.

[0082] Because in Figure 2 The BSS3 shown in the figure is an independent BSS and does not include an AP, and all stations STA6 and STA7 are not connected to the AP. An independent BSS is not allowed to access a distributed system and forms a self-contained network. In an independent BSS, corresponding stations STA6 and STA7 can be directly connected to each other.

[0083] Figure 3 1 is a block diagram illustrating a configuration of a station 100 according to an embodiment of the present invention. Figure 3 As illustrated in FIG. 1 , the station 100 according to an embodiment of the present invention may include a processor 110 , a communication unit 120 , a user interface unit 140 , a display unit 150 , and a memory 160 .

[0084] First, the communication unit 120 sends and receives wireless signals, such as wireless LAN packets, etc., and can be embedded in the station 100, or provided as a peripheral. According to an embodiment, the communication unit 120 may include at least one communication module using different frequency bands. For example, the communication unit 120 may include communication modules with different frequency bands (such as 2.4GHz, 5GHz, 6GHz and 60GHz). According to an embodiment, the station 100 may include a communication module using a frequency band of 7.125GHz or above, and a communication module using a frequency band of 7.125GHz or below. Each communication module may perform wireless communication with an AP or an external station according to the wireless LAN standard of the frequency band supported by the corresponding communication module. The communication unit 120 may operate only one communication module at a time, or operate multiple communication modules together at the same time, according to the performance and requirements of the station 100. When the station 100 includes multiple communication modules, each communication module may be implemented by an independent component, or multiple modules may be integrated into one chip. In an embodiment of the present invention, the communication unit 120 may represent a radio frequency (RF) communication module for processing RF signals.

[0085] Second, the user interface unit 140 includes various types of input / output devices provided in the station 100. That is, the user interface unit 140 can receive user input by using various input devices, and the processor 110 can control the station 100 based on the received user input. In addition, the user interface unit 140 can perform output based on the command of the processor 110 by using various output devices.

[0086] Next, the display unit 150 outputs an image on the display screen. The display unit 150 may output various display objects, such as content or a user interface executed by the processor 110, etc., based on the control command of the processor 110. In addition, the memory 160 stores a control program used in the station 100 and various result data. The control program may include an access program required for the station 100 to access an AP or an external station.

[0087] The processor 110 of the present invention can execute various commands or programs and process data in the station 100. In addition, the processor 110 can control various units of the station 100 and control data transmission / reception among the units. According to an embodiment of the present invention, the processor 110 can execute a program for accessing an AP stored in the memory 160 and receive a communication configuration message sent by the AP. In addition, the processor 110 can read information about the priority condition of the station 100 included in the communication configuration message, and request access to the AP based on the information about the priority condition of the station 100. The processor 110 of the present invention can represent the main control unit of the station 100, and according to an embodiment, the processor 110 can represent a control unit for individually controlling certain components of the station 100 (such as the communication unit 120, etc.). That is, the processor 110 can be a modem or a modulator / demodulator for modulating a wireless signal sent to the communication unit 120 and demodulating a wireless signal received from the communication unit 120. The processor 110 controls various operations of wireless signal transmission / reception of the station 100 according to an embodiment of the present invention. Its detailed embodiment will be described below.

[0088] exist Figure 3 The station 100 illustrated in FIG. 1 is a block diagram according to an embodiment of the present invention, where the separated blocks are illustrated as elements of a logically distinguished device. Therefore, the elements of the device can be installed in a single chip or multiple chips according to the design of the device. For example, the processor 110 and the communication unit 120 can be implemented when integrated into a single chip, or implemented as separate chips. In addition, in an embodiment of the present invention, some components of the station 100, for example, the user interface unit 140 and the display unit 150 can be selectively provided in the station 100.

[0089] Figure 4 is a block diagram illustrating the configuration of the AP 200 according to an embodiment of the present invention. Figure 4 As shown in FIG. 2 , the AP 200 according to an embodiment of the present invention may include a processor 210, a communication unit 220, and a memory 260. Figure 4 Among the components of AP200, Figure 2 The components of station 100 are the same as or correspond to Figure 2 A repeated description of parts of the components of the station 100 will be omitted.

[0090] refer to Figure 4 , the AP 200 according to the present invention includes a communication unit 220 that operates a BSS in at least one frequency band. Figure 3As described in the embodiment of the present invention, the communication unit 220 of the AP 200 may also include a plurality of communication modules using different frequency bands. That is, the AP 200 according to the embodiment of the present invention may include two or more communication modules in different frequency bands (e.g., 2.4 GHz, 5 GHz, 6 GHz, and 60 GHz) together. Preferably, the AP 200 may include a communication module using a frequency band of 7.125 GHz or above, and a communication module using a frequency band of 7.125 GHz or below. Each communication module may perform wireless communication with a station according to the wireless LAN standard of the frequency band supported by the corresponding communication module. The communication unit 220 may operate only one communication module at a time according to the performance and requirements of the AP 200, or operate a plurality of communication modules together at the same time. In an embodiment of the present invention, the communication unit 220 may represent a radio frequency (RF) communication module for processing RF signals.

[0091] Next, the memory 260 stores the control program and various result data used in the AP 200. The control program may include an access program for managing the access of the station. In addition, the processor 210 may control the various units of the AP 200 and control the data transmission / reception among the units. According to an embodiment of the present invention, the processor 210 may execute the program for accessing the station stored in the memory 260 and send a communication configuration message for one or more stations. In this case, the communication configuration message may include information about the access priority conditions of the various stations. In addition, the processor 210 performs access configuration according to the access request of the station. According to an embodiment, the processor 210 may be a modem or a modulator / demodulator for modulating a wireless signal sent to the communication unit 220 and demodulating a wireless signal received from the communication unit 220. The processor 210 controls various operations according to an embodiment of the present invention, such as the wireless signal transmission / reception of the AP 200. Its detailed embodiment will be described below.

[0092] Figure 5 is a diagram schematically illustrating a process in which a STA sets up a link with an AP.

[0093] refer to Figure 5 , in a broad sense, a link between the STA 100 and the AP 200 is set up via three steps of scanning, authentication, and association. First, the scanning step is a step in which the STA 100 obtains access information of a BSS operated by the AP 200. Methods for performing scanning include a passive scanning method in which the AP 200 obtains information by using a beacon message (S101) transmitted periodically, and an active scanning method in which the STA 100 transmits a probe request to the AP (S103), and obtains access information by receiving a probe response from the AP (S105).

[0094] The STA 100 that successfully receives the wireless access information in the scanning step performs an authentication step by sending an authentication request (S107a) and receiving an authentication response (S107b) from the AP 200. After performing the authentication step, the STA 100 performs an association step by sending an association request (S109a) and receiving an association response (S109b) from the AP 200. In this specification, association basically refers to wireless association, but the present invention is not limited thereto, and association can broadly include both wireless association and wired association.

[0095] At the same time, an authentication step (S111) based on 802.1X and an IP address acquisition step (S113) via DHCP may be additionally performed. Figure 5 In the present invention, the authentication server 300 is a server that processes 802.1X-based authentication for the STA 100, and may exist in physical association with the AP 200, or exist as a separate server.

[0096] Figure 6 is a diagram showing a carrier sense multiple access (CSMA) / collision avoidance (CA) method used in wireless LAN communication.

[0097] A terminal performing wireless LAN communication checks whether a channel is busy by performing carrier sensing before sending data. When a wireless signal with a predetermined strength or greater is sensed, it is determined that the corresponding channel is busy and the terminal delays access to the corresponding channel. This process is called idle channel assessment (CCA), and the level that determines whether the corresponding signal is sensed is called the CCA threshold. When a wireless signal with a CCA threshold or higher received by the terminal indicates the corresponding terminal as a recipient, the terminal processes the received wireless signal. At the same time, when no wireless signal is detected in the corresponding channel or a wireless signal with a strength less than the CCA threshold is detected, it is determined that the channel is idle.

[0098] When it is determined that the channel is idle, each terminal with data to be sent performs a backoff process after an interframe space (IFS) time, which depends on the situation of each terminal, for example, after arbitration IFS (AIFS), PCF IFS (PIFS), etc. According to this embodiment, AIFS can be used as a component to replace the existing DCF IFS (DIFS). Each terminal waits while reducing the time slot time as long as a random number determined by the corresponding terminal during the interval of the idle state of the channel, and the terminal that completely runs out of the time slot time attempts to access the corresponding channel. In this way, the interval in which each terminal performs the backoff process is called a contention window interval.

[0099] When a specific terminal successfully accesses a channel, the corresponding terminal can send data through the channel. However, when the terminal attempting to access conflicts with another terminal, the terminals that conflict with each other are assigned new random numbers respectively to perform the backoff process again. According to an embodiment, the random number newly assigned to each terminal can be determined within a range (2*CW), which is twice the range (contention window CW) of the random number previously assigned to the corresponding terminal. At the same time, each terminal attempts to access by performing the backoff process again in the next contention window interval, and in this case, each terminal performs the backoff process from the remaining time slot time in the previous contention window interval. In this way, each terminal performing wireless LAN communication can avoid mutual conflict of specific channels.

[0100] <Examples of various PPDU formats>

[0101] Figure 7 An example of the format of a PLCP protocol data unit (PPDU) for each of the various standard generations is illustrated. More specifically, Figure 7 (a) illustrates an embodiment of a conventional PPDU format based on 802.11a / g, Figure 7 (b) illustrates an embodiment of the HE PPDU format based on 802.11ax, and Figure 7 (c) illustrates an embodiment of a non-legacy PPDU (ie, EHT PPDU) based on 802.11be. Figure 7 (d) illustrates a detailed field configuration of RL-SIG and L-SIG commonly used in the PPDU format.

[0102] refer to Figure 7 (a), the preamble of the legacy PPDU includes a legacy short training field (L-STF), a legacy long training field (L-LTF) and a legacy signal field (L-SIG). In an embodiment of the present invention, L-STF, L-LTF and L-SIG may be referred to as a legacy preamble.

[0103] refer to Figure 7 (b), the preamble of the HE PPDU also includes a repeated legacy short training field (RL-SIG), a high efficiency signal A field (HE-SIG-A), a high efficiency signal B field (HE-SIG-B), a high efficiency short training field (HE-STF) and a high efficiency long training field (HE-LTF) in the legacy preamble. In an embodiment of the present invention, RL-SIG, HE-SIG-A, HE-SIG-B, HE-STF and HE-LTF may be referred to as HE preamble. The detailed configuration of the HE preamble may be modified according to the HE PPDU format. For example, HE-SIG-B may be used only in the HE MU PPDU format.

[0104] refer to Figure 7 (c), the EHT PPDU also includes a repeated legacy short training field (RL-SIG), a universal signal field (U-SIG) and an extremely high throughput signal A field (EHT-SIG-A), an extremely high throughput signal B field (EHT-SIG-B), an extremely high throughput short training field (EHT-STF) and an extremely high throughput long training field (EHT-LTF) in the legacy preamble. In an embodiment of the present invention, RL-SIG, EHT-SIG-A, EHT-SIG-B, EHT-STF and EHT-LTF may be referred to as EHT preambles. The specific configuration of the non-legacy preamble may be modified according to the EHT PPDU format. For example, EHT-SIG-A and EHT-SIG-B may be used only in a portion of the EHT PPDU format.

[0105] 64-FFT OFDM is applied to the L-SIG field included in the preamble of the PPDU, and the L-SIG field includes a total of 64 subcarriers. Among the 64 subcarriers, 48 ​​subcarriers other than the guard subcarrier, the DC subcarrier, and the pilot subcarrier are used for transmission of L-SIG data. BPSK and a modulation and coding scheme (MCS) of code rate = 1 / 2 are applied to the L-SIG, so the L-SIG can include a total of 24 bits of information. Figure 7 (d) illustrates the configuration of 24-bit information of L-SIG.

[0106] refer to Figure 7 (d), L-SIG includes an L_RATE field and an L_LENGTH field. The L_RATE field includes 4 bits and indicates the MCS used for data transmission. Specifically, the L_RATE field indicates a value of a transmission rate of 6 / 9 / 12 / 18 / 24 / 36 / 48 / 54 Mbps obtained by combining a modulation scheme such as BPSK / QPSK / 16-QAM / 64-QAM with a non-efficiency such as 1 / 2, 2 / 3, 3 / 4, etc. The total length of the corresponding PPDU can be indicated by combining the information of the L_RATE field and the information of the L_LENGTH field. In the non-traditional PPDU format, the L_RATE field is configured to a minimum rate of 6 Mbps.

[0107] The unit of the L_LENGTH field is byte, and a total of 12 bits are allocated so that up to 4095 are signaled, and the length of the PPDU may be indicated in conjunction with the L_RATE field. A legacy terminal and a non-legacy terminal may interpret the L_LENGTH field differently.

[0108] First, the method of interpreting the length of the PPDU using the L_LENGTH field by a legacy terminal or a non-legacy terminal is as follows. When the L_RATE field is set to 6 Mbps, it is possible to us 3 bytes (i.e., 24 bits) are sent within 4 us is one symbol duration of 64FFT. Therefore, the number of symbols based on 64FFT after L-SIG is obtained by adding 3 bytes corresponding to the SVC field and the tail field to the value of the L_LENGTH field and dividing it by 3 bytes of the transmission amount as one symbol. The length of the corresponding PPDU, that is, the reception time (that is, RXTIME) is calculated by multiplying the obtained number of symbols by 4us which is one symbol duration and then adding 20us for transmitting L-STF, L-LTF and L-SIG. us This can be expressed by the following equation 1.

[0109] [Equation 1]

[0110]

[0111] in this case, represents the smallest natural number greater than or equal to x. Since the maximum value of the L_LENGTH field is 4095, the length of the PPDU can be set to be as long as 5.464ms. A non-legacy terminal sending a PPDU should set the L_LENGTH field as shown in Equation 2 below.

[0112] [Equation 2]

[0113]

[0114] Here, TXTIME is the total transmission time constituting the corresponding PPDU and is represented by the following Equation 3. In this case, TX represents the transmission time of X.

[0115] [Equation 3]

[0116] TXTIME(us)=T L-STF +T L-LTF +T L-SIG +T RL-SIG +T U-SIG +(T EHT-SIG-A )+(T EHT-SIG-B )+T EHT-STF +N EHT-LTF ·T EHT-LTF +T DATA

[0117] Referring to the above equation, the length of the PPDU is calculated based on the rounded-up value of L_LENGTH / 3. Therefore, for random values ​​of k, three different values ​​of L_LENGTH={3k+1, 3k+2, 3(k+1)} indicate the same PPDU length.

[0118] refer to Figure 7 (e), the Universal SIG (U-SIG) field continues to exist in the subsequent generation of EHT PPDU and WLAN PPDU, and is used to classify the generation of PPDU including 11be. U-SIG is an OFDM 2 symbol based on 64FFT and can transmit a total of 52 bits of information. Of the 52 bits, 43 bits other than the 9 bits of CRC / tail are mainly divided into a version-independent (VI) field and a version-dependent (VD) field.

[0119] The VI bit enables the current bit configuration to be maintained subsequently, so that even if the next generation of PPDU is defined, the current 11be terminal can obtain information about the PPDU through the VI field of the PPDU. To this end, the VI field includes PHY version, UL / DL, BSS color, TXOP, and reserved fields. The PHY version field is 3 bits and is used to sequentially classify 11be and subsequent generations of wireless LAN standards into versions. The value of 11be is 000b. The UL / DL field identifies whether the PPDU is an uplink / downlink PPDU. The BSS color indicates the identifier of each BSS defined in 11ax and has a value of 6 bits or higher. TXOP indicates the duration of the transmission opportunity sent in the MAC header, wherein, by adding TXOP to the PHY header, the PPDU can infer the length of the TXOP included therein without having to decode the MPDU, and TXOP has a value of 7 bits or higher.

[0120] The VD field is signaling information useful only for the 11be version of the PPDU, and may include fields commonly used in any PPDU format such as PPDU format and BW, as well as fields defined differently for each PPDU format. The PPDU format is a classifier for classifying EHT single user (SU), EHT multi-user (MU), EHT trigger-based (TB), EHT extended range (ER) PPDU, etc. The BW field signals five basic PPDU BW options (BW, which can be expressed in the form of an exponential power of 20*2, which can be referred to as a basic BW) of 20, 40, 80, 160 (80+80) and 320 (160+160) MHz, and various remaining PPDU BWs configured via preamble puncturing. After signaling at 320MHz, signaling may be performed in the form of some 80MHz being punctured. The punctured and modified channel type may be signaled directly in the BW field, or the punctured and modified channel type may be signaled using the BW field and a field that appears after the BW field (e.g., a field within the EHT-SIG field). If the BW field is configured as 3 bits, a total of 8 BW signalings may be performed, and thus only up to 3 signalings may be performed in the puncturing mode. If the BW field is configured as 4 bits, a total of 16 BW signalings may be performed, and thus up to 11 signalings may be performed in the puncturing mode.

[0121] The field located after the BW field varies depending on the type and format of the PPDU, the MU PPDU and the SU PPDU may be signaled in the same PPDU format, a field for classifying between the MU PPDU and the SU PPDU may be located before the EHT-SIG field, and additional signaling may be performed on the field. Both the SU PPDU and the MU PPDU include the EHT-SIG field, but some fields that are not required in the SU PPDU may be compressed. Information about the field to which compression has been applied may be omitted or may have a size smaller than the size of the original field included in the MU PPDU. For example, in the case of the SU PPDU, the common field of the EHT-SIG may be omitted or replaced, or the SU PPDU may have a different configuration in which a user-specific field is replaced, reduced to one, etc.

[0122] Alternatively, the SU PPDU may further include a compression field indicating whether compression is performed, and a portion of a field (eg, RA field, etc.) may be omitted according to a value of the compression field.

[0123] If a portion of the EHT-SIG field of the SU PPDU is compressed, the information to be included in the compressed field may also be signaled in an uncompressed field (e.g., a common field, etc.). The MU PPDU corresponds to a PPDU format for simultaneous reception by multiple users, and therefore requires that the EHT-SIG field be sent after the U-SIG field, and the amount of information sent may vary. That is, multiple MU PPDUs are sent to multiple STAs, so that each STA should identify the position of the RU to which the MU PPDU is sent, the STAs to which the RUs are respectively allocated, and whether the sent MU PPDU has been sent to the STA itself. Therefore, the AP should send the above information by including it in the EHT-SIG field. To this end, information for effective transmission of the EHT-SIG field is signaled in the U-SIG field, and this may correspond to the MCS as a modulation method and / or the number of symbols in the EHT-SIG field. The EHT-SIG field may include information about the size and position of the RU allocated to each user.

[0124] In the case of a SU PPDU, multiple RUs may be allocated to a STA, and the multiple RUs may be contiguous or discontinuous. If the RUs allocated to the STA are discontinuous, the STA should identify the punctured RUs in the middle in order to effectively receive the SUPPDU. Therefore, the AP may send a SU PPDU including information of the punctured RUs among the RUs allocated to the STA (e.g., a puncture pattern of the RUs, etc.). That is, in the case of a SU PPDU, a puncture mode field may be included in the EHT-SIG field, the puncture mode field including information indicating a puncture pattern and whether a puncture mode is applied in a bitmap format, etc., and the puncture mode field may signal the type of discontinuous channels occurring within the bandwidth.

[0125] The signaled discontinuous channel type is limited and indicates the BW and discontinuous channel information of the SU PPDU combined with the value of the BW field. For example, the SU PPDU is a PPDU sent only to a single terminal, so that the STA can identify the bandwidth allocated to itself via the BW field included in the PPDU, and the SU PPDU can identify the perforated resources in the allocated bandwidth via the perforation pattern field of the EHT-SIG field or the U-SIG field included in the PPDU. In this case, the terminal can receive the PPDU in the remaining resource units after excluding the specific channel of the perforated resource unit. Multiple RUs allocated to the STA can be configured by different frequency bands or tones.

[0126] In order to reduce the signaling overhead of the SU PPDU, only limited discontinuous channel types are signaled. Puncturing can be performed for each 20MHz subchannel, so if puncturing is performed for a BW with a large number of 20MHz subchannels (such as 80, 160, and 320MHz), in the case of 320MHz, the discontinuous channel type (if puncturing only for the edge 20MHz is also considered discontinuous) should be signaled by indicating whether each of the 15 remaining 20MHz subchannels after excluding the primary channel is used. In this way, considering the low transmission rate of the signaling part, allocating 15 bits to signal the discontinuous channel type of a single user transmission may act as an excessive signaling overhead.

[0127] The present invention proposes a technique for signaling a discontinuous channel type of a SU PPDU and illustrates the discontinuous channel type determined according to the proposed technique. The present invention also proposes a technique for signaling each of the puncturing types of the primary 160 MHz and the secondary 160 MHz in a 320 MHz BW configuration of a SU PPDU. Figure 17 to Figure 19 2 illustrates the allowed non-contiguous channel types when the non-contiguous channel type specification technique is applied, and the technique for signaling the non-contiguous channel type with 3 bits.

[0128] One embodiment of the present invention proposes a technology for differently configuring a PPDU indicated by a leading puncturing BW value according to a PPDU format signaled in a PPDU format field. Assuming that the BW field is 4 bits, and in the case of an EHTSU PPDU or a TB PPDU, an EHT-SIG-A of 1 symbol may be additionally signaled after the U-SIG, or the EHT-SIG-A may not be signaled at all, therefore, in view of this, it is necessary to fully signal up to 11 puncturing patterns only via the BW field of the U-SIG. However, in the case of an EHT MU PPDU, an EHT-SIG-B is additionally signaled after the U-SIG, so that up to 11 puncturing patterns may be signaled in a method different from that of the SU PPDU. In the case of an EHT ER PPDU, the BW field may be configured as 1 bit to signal whether the EHT ER PPDU is a PPDU using a 20 MHz band or a 10 MHz band. This will be discussed later. Fig.11 and Fig.12 The detailed puncture pattern for each PPDU type is described in detail in.

[0129] Figure 7(f) illustrates the configuration of the format-specific fields of the VD field when the EHT MU PPDU is indicated in the PPDU format field of the U-SIG. In the case of the MU PPDU, SIG-B is necessarily required, which is a signaling field for simultaneous reception by multiple users, and SIG-B can be transmitted after the U-SIG without a separate SIG-A. To this end, information for decoding SIG-B should be signaled in the U-SIG. These fields include SIG-BMCS, SIG-B DCM, the number of SIG-B symbols, SIG-B compression, and the number of EHT-LTF symbols.

[0130] Figure 8 Examples of various extremely high throughput (EHT) physical protocol data unit (PPDU) formats and a method for indicating the formats according to an embodiment of the present invention are illustrated.

[0131] Reference Figure 8 , the PPDU may include a preamble and a data part, and the EHT PPDU format as the PPDU type may be classified according to the U-SIG field included in the preamble. Specifically, based on the PPDU format field included in the U-SIG field, it may be indicated whether the format of the PPDU is an EHT PPDU.

[0132] Figure 8 (a) shows an example of an EHT SU PPDU format for a single STA. The EHT SU PPDU is a PPDU for single user (SU) transmission between an AP and a single STA, and an EHT-SIG-A field for additional signaling may be located after the U-SIG field.

[0133] Figure 8 (b) shows an example of an EHT triggered PPDU format corresponding to an EHT PPDU transmitted based on a trigger frame. The EHT triggered PPDU is an EHT PPDU transmitted based on a trigger frame and is an uplink PPDU for responding to a trigger frame. Unlike the EHT SU PPDU, the EHT-SIG-A field is not located after the U-SIG field in the EHT PPDU.

[0134] Figure 8 (c) shows an example of an EHT MU PPDU format corresponding to an EHT PPDU of multiple users. The EHT MU PPDU is a PPDU for transmitting a PPDU to one or more STAs. In the EHT MU PPDU format, the HE-SIG-B field may be located after the U-SIG field.

[0135] Figure 8(d) shows an example of an EHT ER SU PPDU format, which is used for single user transmission with STAs within extended range. Figure 8 Compared with the EHT SU PPDU described in (a), the EHT ER SU PPDU can be used for single-user transmission with a wider range of STAs, and the U-SIG field can be repeatedly positioned on the time axis.

[0136] Figure 8 The EHT MU PPDU described in (c) may be used by the AP to perform downlink transmission toward multiple STAs. Here, the EHT MU PPDU may include scheduling information so that multiple STAs can simultaneously receive the PPDU sent from the AP. The EHT MU PPDU may transmit the AID information of the transmitter and / or receiver of the PPDU sent via the user-specific field of the EHT-SIG-B to the STA. Therefore, multiple terminals that have received the EHT MU PPDU may perform a spatial reuse operation based on the AID information of the user-specific field included in the preamble of the received PPDU.

[0137] Specifically, the resource unit allocation (RA) field of the HE-SIG-B field included in the HE MU PPDU may include information about the configuration of the resource unit in a specific bandwidth (e.g., 20 MHz, etc.) of the frequency axis (e.g., the division form of the resource unit). That is, the RA field may indicate the configuration of the resource unit divided in the bandwidth used for transmission of the HE MU PPDU so that the STA receives the PPDU. Information about the STA allocated (or designated) to each divided resource unit may be included in the user-specific field of the EHT-SIG-B so as to be sent to the STA. That is, the user-specific field may include one or more user fields corresponding to the corresponding divided resource unit.

[0138] For example, the user field corresponding to at least one resource unit used for data transmission among multiple partitioned resource units may include the AID of the receiver or transmitter, and the user field corresponding to the remaining resource units not used for data transmission may include a pre-configured empty STA ID.

[0139] Fig. 9 An example of a coding structure and a transmission method of an EHT-SIG field according to an embodiment of the present invention is illustrated. Fig. 9 (a) illustrates the coding structure in which EHT-SIG-B is encoded, and Fig. 9 (b) illustrates a transmission method of the EHT-SIG-B in a bandwidth of 40 MHz or more.

[0140] refer to Fig. 9(a), the EHT-SIG-B may include a common block field and a user-specific field. The user-specific field may include at least one user field, and each user field may be listed in the order of the assigned users according to the arrangement of the resource units indicated by the resource allocation (RA) field of the common block field.

[0141] The user-specific field includes at least one user field, and at least one user field is sent in units of user block fields. As described above, the user block field includes a combination of two user fields, a CRC field, and a tail field. If the total number of user fields is an odd number, the last user block field may include only one user field. Padding may be added at the end of the EHT-SIG-B according to the OFDM symbol boundary.

[0142] refer to Fig. 9 (b), EHT-SIG-B is encoded separately in each 20MHz frequency band. EHT-SIG-B can include up to two content channels in units of 20MHz, namely, EHT-SIG-B content channel 1 and EHT-SIG-B content channel 2. Fig. 9In (b), each box represents a 20MHz frequency band, and "1" and "2" in the box represent EHT-SIG-B content channel 1 and EHT-SIG-B content channel 2, respectively. The individual HE-SIG-B content channels in the total frequency band are arranged according to the order of the physical frequency band. That is, HE-SIG-B content channel 1 is transmitted in the lowest frequency band, and HE-SIG-B content channel 2 is transmitted in the subsequent high frequency band. The content channel configuration is repeated by duplicating the content in the subsequent high frequency band. For example, for the first to fourth channels in ascending frequency order constituting the total 80MHz frequency band, HE-SIG-B content channel 1 is transmitted in the first and third channels, and HE-SIG-B content channel 2 is transmitted in the second and fourth channels. Similarly, for the first to eighth channels in ascending frequency order constituting the total 160MHz frequency band, HE-SIG-B content channel 1 is transmitted in the first, third, fifth and seventh channels, and HE-SIG-B content channel 2 is transmitted in the second, fourth, sixth and eighth channels. Similarly, for the first channel to the 16th channel constituting the total 320 MHz frequency band in ascending order of frequency, HE-SIG-B content channel 1 is transmitted in the first, third, fifth, seventh, ninth, eleventh, thirteenth and fifteenth channels, and HE-SIG-B content channel 2 is transmitted in the second, fourth, sixth, eighth, tenth, twelfth, fourteenth and sixteenth channels. If the terminal is able to decode HE-SIG-B content channel 1 via at least one channel and HE-SIG-B content channel 2 via at least one other channel, the terminal can obtain information about the MU PPDU configuration of the total bandwidth. On the other hand, if the total bandwidth is 20 MHz, only one SIG-B content channel is transmitted.

[0143] Fig.10 Examples of various BW modes of the EHT SU PPDU are illustrated.

[0144] Reference Fig.10, in 801.11be, for EHT, PPDU can be sent via a bandwidth of up to 320MHz, where there is a problem that PPDU can be sent only when all channels are idle. In the case of 11ax using orthogonal frequency division multiplexing access (OFDMA), in the MU PPDU in which the AP sends PPDU to multiple STAs, a preamble puncturing mode is possible, wherein the preamble puncturing mode is a mode in which only channels whose CCA results are idle at each 20MHz where the MU PPDU is sent are combined to perform transmission. In the case of 11be, the preamble puncturing mode can be used even in the SU PPDU in which the AP performs transmission to a single STA. That is, when the AP sends PPDU to multiple STAs or sends PPDU to a single STA, even if not all channels of the total bandwidth are idle, only idle channels can be combined to send the PPDU. In the case of the SU PPDU, if multiple resource units are allocated to a single STA, the AP can send the PPDU to the single STA only in the channel of the idle resource unit by using the preamble puncturing mode.

[0145] Hereinafter, a BW indicator indicating a (maximum) bandwidth for transmitting a PPDU may be transmitted via a bandwidth field of a U-SIG.

[0146] like Fig.10 As shown, the mode of BW=0 to BW=4 is an embodiment of sending a PPDU by combining continuous channels without preamble puncturing. The mode of BW=5 to 9 is the following BW mode of the PPDU, in which the channels retained after excluding the busy channels among the remaining 20MHz sub-channels after excluding the main 20MHz channel in the total 80MHz channel bandwidth are combined to perform transmission. In the case of BW=5 and 6, the final transmitted and occupied channel is 40MHz, while in the case of BW7 to 9, 60MHz is occupied. As described above, in order to perform the preamble puncturing of the SU PPDU in a bandwidth of up to 80MHz, the transmitter can prepare an A-MPDU in a PSDU type, which is the data to be sent for each 20MHz RU, and then the PPDU can be sent only in the 20MHz band including the available P20 according to the CCA result immediately before the transmission. Here, the type of RU prepared for each 20MHz band should be a separate 20MHz RU type different from the 20MHz RU within the 80MHz RU allocation of 11ax. This is because when data is transmitted through a 242 RU allocation corresponding to 20 MHz within an 80 MHz RU allocation, if a corresponding 20 MHz adjacent channel is punctured, an interference signal may also be leaked to the punctured channel.

[0147] Therefore, if a preamble punctured transmission is attempted, a STA that is preparing to transmit via an 80MHz bandwidth in a SU PPDU may prepare four PSDUs corresponding to the same type of RUs as a separate 20MHz transmission RU of each 20MHz bandwidth, and then may send the prepared PSDUs on an available 20MHz channel according to the CCA result. In this case, if four PSDUs corresponding to four 20MHz RUs constituting an 80MHz transmission RU are generated and prepared, and then transmitted in a punctured mode according to the CCA result, interference may occur in the punctured channel. Hereinafter, the following will be described as an example. Fig.11 .

[0148] Fig.11 The following figure shows the RU allocation distribution for each of the 20MHz, 40MHz, and 80MHz used in 11ax and 11be. Fig.11 (c) is implemented as 80MHz RU repeated twice. 320MHz can be achieved as 160MHz repeated twice or Fig.11 (c) is realized in the form of 80MHz RU repeated four times. 240MHz is realized in the form of 80MHz+160MHz or 160MHz+80MHz, so it can be Fig.11 (c) The 80MHz RU is repeated three times.

[0149] Compare Fig.11 (a) and Fig.11 (c) , in (a) where the 20MHz RU allocation is defined within the total 20MHz frequency band, the guard carriers are located on the left and right of the 242 carriers, while in (c) where the 20MHz RU allocation is defined within the total 80MHz frequency band, transmission is performed without guard carriers on the left and right of the 242 carriers.

[0150] Fig.10The mode of BW=10 to 14 is the following BW mode of PPDU, in which the channels remaining after excluding busy channels among the remaining sub-channels after excluding 40MHz channels including the main 20MHz channel in the total 160MHz channel bandwidth are combined to perform transmission. In the case of BW=10 and 11, the final transmitted and occupied channel is 80MHz, and in the case of BW12 to 14, 120MHz is occupied. As described above, in order to perform preamble puncturing of SU PPDU in a bandwidth of up to 160MHz, the transmitter can prepare an A-MPDU in a PSDU type, which is data to be sent for each 40MHz RU, and then transmission can be performed only in the available 40MHz band including P40 according to the CCA result immediately before transmission. Here, the type of RU prepared for each 40MHz band should be a separate 40MHzRU type that is different from the 40MHz RU within the 160MHz RU allocation of 11ax. This is due to the same reasons as above. The 160MHz RU corresponds to a 40MHz RU in which each 80MHz channel is repeated. Fig.11 (c) 80MHz RU form. Compare Fig.11 (b) and Fig.11 (c) , in (a) where 40MHz RU allocation is defined within the total 40MHz frequency band, the guard carriers are located on the left and right of the 484 carriers, while in (c) where 40MHz RU allocation is defined within the total 80MHz frequency band, transmission is performed without guard carriers on the left and right of the 484 carriers.

[0151] The mode of BW=15 to 19 is the following BW mode of PPDU, in which the channels remaining after excluding busy channels among the remaining sub-channels after excluding 80MHz channels including the main 20MHz channel in the total 320MHz channel bandwidth are combined to perform transmission. In the case of BW=15 and 16, the channel finally transmitted and occupied is 160MHz, and in the case of BW=17 to 19, 240MHz is occupied. As described above, in order to perform preamble puncturing of SU PPDU in a bandwidth of up to 320MHz, the transmitter can prepare an A-MPDU in a PSDU type, which is data to be sent for each 80MHz RU, and then transmission can be performed only in the available 80MHz band including P80 according to the CCA result immediately before transmission. Here, the type of RU prepared for each 80MHz band is corresponding to Fig.11 (c) shows the form of 996 carriers in an 80MHz RU.

[0152] Fig.12 An example of a BW mode of an EHT MU PPDU is illustrated.

[0153] The mode from BW=0 to BW=4 corresponds to an embodiment in which a PPDU is transmitted by combining continuous channels without preamble puncturing, and the mode is the same as the mode for the SU PPDU. In this case, as described above, a BW indicator indicating a bandwidth for transmitting the PPDU may be transmitted to the STA via a BW field included in the U-SIG field.

[0154] The modes of BW=5 and 6 are the following BW modes of the PPDU, in which the channels remaining after excluding the busy channels among the 20MHz sub-channels remaining after excluding the main 20MHz channel in the total 80MHz channel bandwidth are combined to perform transmission. In the mode of BW=6, two puncturing modes are possible because, after signaling the BW field of the U-SIG field, it is possible to signal which 20MHz sub-channel is actually punctured via the RU allocation field in the common field of the SIG-B field. Since this has additional signaling fields, such as the SIG-B field, it is advantageous that the BW field of the U-SIG field in the MU PPDU can only signal an approximate BW mode.

[0155] The modes of BW=7 and 8 are the following BW modes of PPDU, in which the channels remaining after excluding the busy channel among the remaining 20MHz sub-channels after excluding the main 20MHz channel in the total 160MHz channel bandwidth are combined to perform transmission. As in the mode of BW=8, three puncturing modes are possible because, as described above, classification can be performed through additional signaling of the SIG-B field.

[0156] The modes of BW=9 and 10 are the following BW modes of PPDU, in which the channels remaining after excluding the busy channels among the remaining 20MHz sub-channels after excluding the main 20MHz channel in the total 320MHz channel bandwidth are combined to perform transmission. As in the mode of BW=10, three puncturing modes are possible because, as described above, classification can be performed through the signaling of SIG-B.

[0157] Fig.13 An example of discontinuous channel types based on a BW usage rate rule according to an embodiment of the present invention is illustrated.

[0158] refer to Fig.13 , the ratio of the bandwidth used after the preamble puncturing is applied to the total bandwidth indicated by the bandwidth field included in the U-SIG field should be equal to or greater than a specific ratio. That is, even if the preamble puncturing is applied, a specific ratio of the bandwidth in the total bandwidth should be used for the transmission of the PPDU.

[0159] For example, Fig.13(a) is a discontinuous channel type that allows PPDU to be transmitted over 80Mhz bandwidth, while Fig.13 (b) is a non-contiguous channel type that allows PPDU transmission over 160Mhz bandwidth. When 50% or more of the bandwidth is required, if Fig.13 If the preamble puncturing is applied in (a), the 60 MHz bandwidth obtained by excluding the punctured 20 MHz from the total 80 MHz bandwidth can be used, and if Fig.13 If the preamble puncturing is applied in (b), the 80MHz bandwidth obtained by excluding 80MHz can be used. Fig.13 In (a), 3 / 4 (75%) of the bandwidth is used after perforation, and Fig.13 In (b), 1 / 2 (50%) of the bandwidth is used after puncturing, so the minimum bandwidth utilization can be met.

[0160] However, in Fig.13 In case (c), the punctured bandwidth is 100 MHz out of the total 160 MHz bandwidth, so the available bandwidth after puncturing is less than 50%. Fig.13 (c) is a discontinuous channel type that is not allowed.

[0161] Fig.13 (a-1) and Fig.13 The (b-1) is respectively in Fig.13 (a) and Fig.13 In (b), a continuous 40 MHz channel is used as an RU. Even in this case, regardless of the RU encoding method, such as Fig.13 (a) and Fig.13 As shown in (b), 50% or more of the total bandwidth is available after puncturing, so these cases correspond to allowable discontinuous channel types.

[0162] Fig.14 An example of discontinuous channel types based on puncture resolution according to an embodiment of the present invention is illustrated.

[0163] Reference Fig.14 , when puncturing is applied to the bandwidth for transmitting PPDU, the puncturing resolution needs to be greater than or equal to a specific ratio of the total bandwidth. That is, when some channels of the bandwidth used for transmission of SU PPDU or MU PPDU are punctured, the AP can notify the STA of the pattern of the punctured RUs via a specific field of the PPDU (e.g., the puncturing mode field, etc.). However, if puncturing is performed within the bandwidth, the puncturing resolution should be greater than or equal to a specific ratio of the total bandwidth.

[0164] For example, a single puncture BW or puncture resolution should be a certain ratio (e.g., 1 / 4) of the total BW or greater. The reason for configuring the limit on the puncture resolution is to normalize the type of discontinuous channels that increase as the BW becomes wider. As a result, as will be described below in the embodiments of the present invention ( Figures 17 to 19 ), the channel type of the total bandwidth can be represented by signaling the discontinuous channel type, regardless of the BW. In addition, the punctured BW adjacent to the main channel in the total bandwidth can be calculated so that the main 20MHz is included.

[0165] Fig.14 (a) and Fig.14 (a') shows allowable discontinuous channels when the total bandwidth is 160 MHz. The total BW is 160 MHz, so a single puncturing can be applied in units of at least 40 MHz. Fig.14 (b) is an embodiment of the case where the total bandwidth is 320 MHz. The total bandwidth is 320 MHz, so a single puncturing can be applied in units of at least 80 MHz. However, if puncturing is performed in the main channel, there may be a situation where the resolution specification cannot be observed due to the puncturing restriction on the main 20 MHz. For example, if puncturing of 80 MHz is performed at the main 80 MHz, only the auxiliary 20 MHz and the auxiliary 40 MHz may be punctured, and the main 20 MHz may not be punctured. Therefore, if puncturing is performed in a segment continuous with P20, the BW including the main 20 MHz may be considered to be a punctured BW. For example, if only 160 MHz of the auxiliary 20 MHz is punctured, it can be considered that 40 MHz including the main 20 MHz has been punctured. Therefore, as in an embodiment of the present invention, even when 1 / 4 of the BW is configured for puncturing resolution, a discontinuous channel type (for example, Fig.15 Mode 7). Fig.14 The embodiment of (c) illustrates a discontinuous channel type of 160MHz BW, in which puncturing of some channels is performed in units of 20MHz, thus showing a discontinuous channel type not allowed in the puncturing BW standard. That is, if Fig.14 In (c), the total bandwidth is configured as 160 MHz, and the puncturing can be limited to be performed in units of 40 MHz bandwidth. Fig.14 In (c), the 20 MHz channel is punctured so that the non-contiguous channel type does not meet the punctured BW criterion. Therefore, such puncturing may not be allowed.

[0166] Fig.14 (d) cannot be used either, because Fig.14 (d) corresponds to a discontinuous channel type in which puncturing is performed in units of 60 MHz, which is not allowed for the total 320 MHz BW.

[0167] Fig.15 An example of discontinuous channel types based on the number of RUs to be decoded according to an embodiment of the present invention is illustrated.

[0168] refer to Fig.15 , based on the total bandwidth of the transmitted PPDU, the bandwidth and / or pattern of the puncturing may be limited.

[0169] Specifically, Fig.15 Figure 1 shows the types of discontinuous channels that can be applied when a continuous 20MHz channel is encoded as a 40MHz or 80MHz RU. When a continuous 20MHz channel is used as a 40MHz or 80MHz RU, the total number of discontinuous RUs is reduced, thereby reducing the decoding burden on the receiving side of the discontinuous channel. Fig.11 As shown in FIG. 1 , considering the 20MHz, 40MHz and 80MHz RU allocation distribution diagrams, each RU is configured with protection carriers at both ends to avoid interference from adjacent channels, and if Fig.13 As shown in (a), a 20MHz channel is used as each RU, and all information of the 20MHz RU is decoded independently. Therefore, the receiving device needs to decode the individual 20MHz in the BW separately, and therefore has the burden of decoding up to 16 separate RUs for the 320MHz BW. In order to reduce this decoding burden, after determining the discontinuous channel type, the transmitting device can combine continuous 20MHz channels and encode them into larger RUs of 40 or 80MHz units. In this case, there is an effect of reducing the number of separate RUs that the receiving device needs to decode simultaneously.

[0170] The same effect can be achieved when a technique for reducing the decoding burden (using parsing, deinterleaving, etc.) is applied by aggregating and decoding individual 20 MHz RUs without using 40 MHz or 80 MHz bandwidth RUs.

[0171] Fig.15 The embodiment of the diagram illustrates a technique for limiting the number of RUs that need to be decoded separately in order to reduce the decoding burden on the receiving device, and the number of RUs applied in this embodiment is limited to two. According to an embodiment, the number of RUs in a specific bandwidth unit can be limited. More specifically, the number of RUs in a 160MHz unit (or a unit of 160MHz or lower) can be limited to two. In this embodiment, it is assumed that the transmitting device uses 40MHz and 80MHz RUs. However, when the number of decoded RUs is reduced by combining 20MHz RUs during the encoding process, the limit on this number may also be applied. In addition, it is assumed that the 160MHz RU includes two 80MHz RUs and the 320MHz includes two 160MHz.

[0172] Fig.15 (a) and Fig.15 (b) corresponds to an available discontinuous channel type, where after puncturing the 160MHz BW, the discontinuous channel type may include two 40MHz RUs, and Fig.15 In case (c), the available discontinuous channel type is not applicable because the discontinuous channel has a total of three RUs, which are two 40 MHz RUs and one 20 MHz RU.

[0173] After 320MHz BW, Fig.15 (d) and Fig.15 Each of (e) includes three RUs. According to the regulations on the number of RUs, two RUs or less should be included. However, the 320MHz operation of EHT is physically configured by 160MHz+160MHz, so that the available discontinuous channel type can be assumed, in which the condition of two RUs within the 160MHz BW is met. On the other hand, in Fig.10 In (f), Fig.10 As shown in (d), 40MHz of the two 160MHz constituting the 320MHz BW is punctured, but after puncturing, each 160MHz can include two 20MHz RUs and one 40MHz RU. Therefore, Fig.15 (f) and Fig.15 (d) is a discontinuous channel type that is not allowed.

[0174] Fig.16 An example of a PPDU format in a discontinuous channel according to an embodiment of the present invention is illustrated.

[0175] Reference Fig.16 , illustrating a basic format applicable to an EHT PPDU and an EHT SU PPDU and a discontinuous channel type segmentation signaling technique for an EHT SU PPDU with a BW exceeding 160 MHz.

[0176] Fig.16 (a) shows the MU PPDU format for multi-user transmission in EHT. Fig.16 As shown in (a) of FIG. 1 , the MU PPDU has a structure in which the EHT-SIG field is signaled after the U-SIG field is signaled. The EHT-SIG field of the MU PPDU may include a common field and a user field (per user), and the common field of the EHT-SIG field may include the number of LTFs, GI+LTF size, RU allocation and / or puncturing mode, etc.

[0177] - Number of LTFs: A field indicating the number of symbols constituting the long training field of the EHT

[0178] -GI+LTF size: indicates the guard interval (GI) duration and EHT-LTF size information

[0179] -RU allocation: RU configuration information of the total bandwidth used for transmission / reception of PPDU

[0180] – Perforation Mode: Indicates whether to apply the perforation mode and / or perforated RUs

[0181] User fields may include STA_ID, MCS, Compile, and NSTS. Fig.16 (b) shows the SU PPDU format for single user transmission of EHT. Fig.16 As shown in (b), the EHT-SIG field of the SU PPDU may be configured in a form in which some contents / field contents of the MU PPDU are changed or deleted. In a typical 320MHz PPDU, Fig.16 As shown in (b), the preamble is repeated in the total 320MHz. However, in the present invention, Fig.16 As shown in (c), for the SU PPDU, an EHT-SIG field different from the EHT-SIG field of the primary 160MHz may be signaled for the secondary 160MHz. That is, the EHT-SIG1 field of the primary 160MHz signals the puncturing pattern of the primary 160MHz BW, respectively, and the EHT-SIG2 field of the secondary 160MHz signals the puncturing pattern of the secondary 160MHz BW, respectively. In other words, in the secondary 160MHz and the primary 20MHz, the EHT-SIG is transmitted separately without being repeated except for the repetition field, so the puncturing patterns indicated by the secondary 160MHz and the primary 20MHz may be different. Here, the SU PPDU transmitted at the primary 20MHz may be repeatedly transmitted up to 4 times (up to 160MHz).

[0182] In other words, if the total bandwidth is divided into primary and secondary bandwidths, the EHT-SIG field of each PPDU transmitted from each segment (primary and secondary) may include different information.

[0183] Specifically, the EHT-SIG field of the primary 160MHz may include content that is different from the content of the EHT field of the secondary 160MHz. That is, if the total bandwidth for PPDU transmission is divided into two or more segments, the content included in the EHT field sent from each segment may be different. In each segment, at least one field included in the EHT-SIG field may be copied and repeated in each predetermined frequency band. For example, if the bandwidth of each segment is 80MHz, at least one field included in the U-SIG field and / or the EHT-SIG field may include the same content every 20MHz. That is, if the PPDU is transmitted on a 320MHz band, and 320MHz is divided into the primary 160MHz (first segment) and the secondary 160MHz (second segment), respectively, the preamble of the PPDU (including the EHT-SIG field) may be configured to have different content in each of the primary 160MHz and the secondary 160MHz.

[0184] In other words, the EHT-SIG field may include one or more content channels, one or more fields corresponding to each other in the same segment (primary 20MHz or auxiliary 160MHz) may be configured to have the same value in each content channel, and one or more fields corresponding to each other between different segments may be configured to have different values.

[0185] For example, if the EHT-SIG field includes a first content channel and a second content channel, at least one of the same fields between the first content channel and the second content channel in the same segment of at least one segment may include the same information. In this case, a resource unit allocation (RU allocation) field, which is information related to the configuration of a resource unit, may be configured with different values ​​according to the content channel.

[0186] If the first content channel and the second content channel include a specific field, a value of the specific field may be identically configured in the same segment but may be differently configured in different segments.

[0187] For example, if the first content channel and the second content channel transmitted in the first segment include a first common field including at least one field having the same value, and the first content channel and the second content channel transmitted in the second segment include a second common field including at least one field having the same value, at least one field included in the first common field and at least one field included in the second common field may include different information. At least one field included in the first common field and at least one field included in the second common field are of the same type.

[0188] The EHT-SIG field may include at least one content channel, and each content channel may include at least one of the common field, the resource unit allocation field, or the user-specific field described above. The resource unit allocation field may be included in the common field.

[0189] Since the value / information of the field sent in each segment is different, the receiving device should receive the EHT-SIG1 field for the primary 160MHz and the EHT-SIG2 field for the secondary 160MHz. Therefore, the receiving device needs to know in advance the channel (not punctured) that can receive the preamble in the secondary 160MHz bandwidth. To this end, information about the channel that can receive the EHT-SIG2 field needs to be signaled to the receiving device in advance, and can be signaled in the BW field of the U-SIG field or a field that appears after the BW field (the preamble of the primary 160MHz is received via the primary 20MHz).

[0190] If the proposed signaling technique of the secondary 160 MHz is not applied, 160 MHz signaling (160 MHz discontinuous channel type information) to be described below may appear twice in the EHT-SIG in order to signal a puncturing pattern in which the BW exceeds 160 MHz.

[0191] Fig.17 An example of discontinuous channels divided according to frequency division according to an embodiment of the present invention is illustrated.

[0192] Fig.17 The diagram illustrates the discontinuous channel types and signaling scheme for an 80 MHz bandwidth that is allowable when restrictions are imposed on the discontinuous channel types.

[0193] like Fig.17 As shown, mode 0 is a continuous channel type, in which no puncturing is applied to the 80MHz bandwidth, and all BW is used. Mode 1 corresponds to a discontinuous channel type, in which only the auxiliary 20MHz in the 80MHz bandwidth is punctured, where the position to be punctured can vary with the two cases of mode 1 (left and right inversion are possible), depending on the position of the main 20MHz in the 80MHz bandwidth. Since the receiving device knows the positions of the main 20MHz, auxiliary 20MHz, and auxiliary 40MHz, the discontinuous type of 80MHz BW can be identified by the mode 1 signaling indicating that the auxiliary 20MHz has been punctured.

[0194] Mode 2 and Mode 3 may signal a discontinuous channel type in which a 20 MHz sub-channel in the secondary 40 MHz is punctured. For example, the AP may include the punctured discontinuous channel type in a bitmap format in the U-SIG or EHT-SIG and send it to the receiving device.

[0195] Two modes are needed to distinguish the punctured 20MHz of the auxiliary 40MHz. Mode 4 and Mode 5 signal a discontinuous channel type in which the auxiliary 20MHz and one of the auxiliary 40MHz are punctured, and two modes are allocated to distinguish the punctured 20MHz together with the auxiliary 20MHz of the auxiliary 40MHz.

[0196] Fig.18 An example of a discontinuous channel for single-user transmission according to an embodiment of the present invention is illustrated.

[0197] refer to Fig.18 , if the total bandwidth is 160MHz, non-contiguous channel types can be allowed by perforating the perforated channels.

[0198] Specifically, if the non-contiguous channel type specification technique is applied, the allowed non-contiguous channel types of 160MHz BW can be Fig.18 The same as those of Mode 0 to Mode 5 in . For example, Mode 0 is a continuous channel type, in which no puncturing is applied in the 160MHz bandwidth, and the total bandwidth is used. Mode 1 corresponds to a discontinuous channel type, in which only the auxiliary 40MHz in the 160MHz bandwidth is punctured, and can be changed in two cases of Mode 1 (left and right inversion are possible) according to the position of the main 20MHz in the 160MHz bandwidth. Since the receiving device knows the positions of the main 20MHz, auxiliary 20MHz, auxiliary 40MHz, and auxiliary 80MHz, the discontinuous type of the 160MHz BW can be identified by Mode 1 signaling indicating that the auxiliary 40MHz has been punctured. Modes 2 and 3 signal a discontinuous channel type, in which a 40MHz subchannel in the auxiliary 80MHz is punctured, and two modes are required to distinguish the punctured 40MHz in the auxiliary 80MHz. Mode 4 and Mode 5 signal a discontinuous channel type in which the auxiliary 40 MHz and one 40 MHz of the auxiliary 80 MHz are punctured, and two modes are allocated to distinguish the 40 MHz punctured together with the auxiliary 40 MHz of the auxiliary 80 MHz.

[0199] Therefore, puncturing patterns 0 to 5 signal the same discontinuous channel type that differs only in the total bandwidth of 80 MHz and 160 MHz, and thus can be represented as the same signaling. The receiving device can identify the total bandwidth and discontinuous channel type by combining the pattern information and the BW field value (80 MHz, 160 MHz, 240 MHz, or 320 MHz).

[0200] Fig.19 An example of discontinuous channels for a specific bandwidth according to an embodiment of the present invention is illustrated.

[0201] refer to Fig.19, if the total bandwidth used for PPDU transmission is 160 MHz or higher, discontinuous channels can be configured in a specific type.

[0202] like Fig.19 As shown, mode 6 indicates a discontinuous channel type in which the auxiliary 20 MHz and the auxiliary 40 MHz are punctured. Mode 7 refers to a discontinuous channel type in which only the auxiliary 20 MHz is punctured in the BW of 160 MHz.

[0203] like Fig.16 As shown, the discontinuous channel types from mode 0 to mode 7 are signaled using 3 bits, and the signaling for BWs exceeding 160MHz (80+160, 160+80, and 160+160) is performed by signaling the puncturing patterns of the primary 80MHz or 160MHz and the secondary 80 or 160MHz, respectively. That is, at least one field of the PPDU sent in each segmented bandwidth may include different information / content. In other words, the U-SIG field and / or the EHT-SIG field sent in each segment may indicate different values ​​in the same field. For example, the PPDU sent in each segment may include a specific field including an indicator for indicating a puncturing pattern associated with each different puncturing pattern. The puncturing pattern may indicate a puncturing channel in a bitmap format according to the puncturing pattern.

[0204] Fig. 20 An example of a PPDU format of an extremely high throughput (EHT) wireless LAN according to an embodiment of the present invention is illustrated.

[0205] refer to Fig. 20 , the configuration of fields included in the PPDU of the EHT WLAN may differ according to the type of the PPDU, the number of terminals to which the PPDU is transmitted, and whether OFDMA is applied.

[0206] Specifically, regarding Fig. 20 (a), Figure 7 (a) illustrates an embodiment of a PPDU format for single / multi-user transmission, and Figure 7 (b) illustrates an embodiment of a trigger-based (TB) PPDU format, which is a PPDU initiated by a trigger frame. Figure 7 (c) illustrates an embodiment of the HE PPDU format based on 802.11ax.

[0207] Reference Figure 7(a), the SU / MU PPDU for single / multi-user transmission may include a legacy short training field (L-STF), a legacy long training field (L-LTF), a legacy signal field (L-SIG), and a repeated legacy signal field (RL-SIG). The above four fields are also included in Figure 7 (c) Legacy fields in the 11ax PPDU format.

[0208] The U-SIG field is a field newly introduced in 11be which is the EHT communication standard, and is a field generally included in the subsequent generation 802.11 standard PPDU including 11be. The Universal SIG (U-SIG) field can be continuously included in the EHT PPDU and the subsequent generation WLAN PPDU, and is used to classify the generation of the PPDU including 11be. The U-SIG field may include two OFDM symbols based on 64FFT, and may transmit a total of 52 bits of information. The interpretation of some fields included in the U-SIG field may vary depending on the PPDU type, whether multi-user transmission is performed, and whether OFDMA transmission is performed, which will be referred to. Fig. 22 The embodiments are described in detail.

[0209] For example, the configuration of fields including the EHT-SIG field may vary according to at least one field value included in the U-SIG field of the SU / MU PPDU.

[0210] The EHT-SIG field is functionally divided into an EHT-VD common field, an EHT-RU allocation field, and an EHT user specific field, and the interpretation of some fields may vary or may be omitted depending on the PPDU type, whether multi-user transmission is performed, and whether OFDMA transmission is performed. For example, if the field value included in the U-SIG field indicates that OFDMA is not applied or indicates single user transmission, the field for allocating resource units may be omitted and not included in the EHT-SIG field.

[0211] The EHT-VD common field and the EHT-RU allocation field may be collectively referred to as the EHT common field. Fig. 22 The embodiments describe in detail the configuration and modification (compression or omission) types of the EHT-SIG field.

[0212] Reference Figure 7(b), the TB PPDU of the EHT transmitted in response to the trigger frame may include only the U-SIG field after the legacy field, and may not include the EHT-SIG field. Therefore, unlike the MU / SU PPDU in which information for decoding the EHT-SIG field is included in the U-SIG field, information for decoding the EHT-SIG field may not be included in the U-SIG field. The TB PPDU may be signaled to include a spatial reuse field, puncturing pattern information indicating whether the above-mentioned RUs constituting the transmission bandwidth are punctured, and the like. Fig.21 Detailed description of the embodiment Fig. 20 (c) U-SIG configuration of TB PPDU and a method of distinguishing TB PPDU from SU / MU PPDU.

[0213] Fig.21 An embodiment of a U-SIG field of an EHT PPDU and fields constituting the U-SIG field according to an embodiment of the present invention is illustrated.

[0214] Reference Fig.21 , the PPDU type may be classified based on a value of a specific field indicating the PPDU type included in the U-SIG field, and the configuration of the EHT-SIG field may be changed according to a value of a field included in the U-SIG field.

[0215] Specifically, Fig.21 (a) is an example of the format structure of the U-SIG field included in the EHT PPDU, and 43 bits excluding the 9-bit CRC / tail from the 52 bits of the U-SIG field are mainly divided into a version-independent (VI) field and a version-dependent (VD) field. Among the information to be provided from the VD field, information that cannot be signaled due to the limitation on the number of bits can be signaled via the EHT-SIG. That is, some fields that need to be included in the VD field may be included in the EHT-SIG field in order to be transmitted, and in this case, the fields in the VD field that need to be included in the EHT-SIG field may be repeatedly transmitted in each predetermined frequency band.

[0216] The VI field enables the current bit configuration to be maintained in the future, so that even if the next generation of PPDU is defined, the current 11be terminal can obtain information about the PPDU through the VI field of the PPDU. To this end, the VI field includes a version identifier, UL / DL, TXOP, BSS color, and PPDU BW field. The version identifier field is used to classify 11be and subsequent generation wireless LAN standards. In the case of 11be, the value of the version identifier field can be signaled as 000b. The UL / DL field is used to identify whether the PPDU is an uplink / downlink PPDU. The TXOP field indicates the transmission opportunity duration sent in the MAC header, wherein, by adding the TXOP field to the PHY header, the PPDU can infer the length of the TXOP included therein without having to decode the MPDU, and 7 bits or more can be allocated.

[0217] The BSS color field indicates an identifier for each BSS to identify the BSS defined in 11ax, and has a value of 6 bits or more. The PPDU BW field indicates the bandwidth occupied by the PPDU, and the indicated bandwidth may be a bandwidth value before the preamble puncturing is applied. More than 3 bits may be allocated to the PPDU BW field, where, when 3 bits are allocated, 000b=20MHz, 001b=40MHz, 010b=80MHz, 011b=160(80+80)MHz, 100b=240(160+80, 80+160)MHz, and 101b=320(160+160)MHz may be signaled.

[0218] The remaining 110b and 111b may be used to signal the BW (>320MHz) of the subsequent standard, and may be used in combination with a portion of the VD field of the subsequent standard to signal the bandwidth of the subsequent standard.

[0219] The VD field is a field that can be changed during the development of subsequent standards, and can be changed during the introduction of new technologies to each standard or the improvement of signaling efficiency. The configuration of the 11be version of the VD field varies according to the PPDU type, and includes a field for signaling the PPDU type. Therefore, the VD field can be divided into a PPDU type field and a PPDU type specific field, and their configuration and interpretation vary according to the PPDU type field. The PPDU type field can be located before or after the PPDU type specific field, or can be located between the fields constituting the PPDU type specific field. The present embodiment provides a description by adopting an example in which the PPDU type field is located before the PPDU type specific field.

[0220] In EHT, the PPDU type may be classified into MU / SU PPDU and TB PPDU, and for this purpose, the PPDU type field may be configured as 1 bit. In this case, the PPDU type field may allow classification into MU / SU PPDU and TB PPDU. Alternatively, in order to classify into MU PPDU, SU PPDU, and TB PPDU separately, the PPDU type field may include 2 bits or more. The present invention is described by taking the case where the PPDU type field is 1 bit as an example.

[0221] Fig.21 (b) illustrates an embodiment of a PPDU type specific field when the PPDU type field of the VD field indicates a MU / SU PPDU. The EHT-SIG MCS field is located after the U-SIG field and refers to the MCS applied to the EHT-SIG field and may be allocated 4 bits or more. The spatial reuse field may be used to have the same meaning as the spatial reuse field 11ax.

[0222] The EHT-SIG Compression field indicates whether the EHT-RU Allocation field in the EHT-SIG field is compressed (omitted), and is allocated 1 bit or 2 bits, wherein the EHT-RU Allocation field indicates the configuration of resource units constituting the total bandwidth through which the PPDU is transmitted. In one embodiment, in the case of 1 bit, 0 may indicate that the EHT-RU Allocation field is not compressed, and 1 may indicate that the EHT-RU Allocation field is compressed and not included in the EHT-SIG field.

[0223] If the EHT compression field is 2 bits, 00b may indicate that the EHT-RU allocation field is not compressed, 01b may indicate compression mode 1, and 10b may indicate compression mode 2, and so on. The EHT-SIG compression field signals whether the corresponding PPDU is an OFDMA MU PPDU to which OFDMA has been applied. In the case of a MU PPDU to which OFDMA has been applied, RUs need to be allocated to each STA, so the EHT-RU allocation field cannot be compressed. Therefore, the STA can identify whether the received PPDU is a MU PPDU to which OFDMA has been applied by determining whether the EHT-RU allocation field is compressed via the EHT-SIG compression field. If OFDMA is not applied, since the RU is configured by the same number of tones (or frequency bands) even in the case of a MU PPDU, there is no need to send the RU allocation field indicating the configuration of the RU to the STA separately. Therefore, in this case, the EHT-SIG compression field may indicate that the RU allocation field is not included in the EHT-SIG field.

[0224] In the EHT-SIG symbol or the MU-MIMO user number field, four or more bits are allocated, and the length of the EHT user specific field may be signaled for use in decoding the EHT user specific field. In the EHT-SIG symbol or the MU-MIMO user number field, when the EHT-SIG compression field is not 0, that is, when the compression mode is applied, the number of MU-MIMO users (ie, STAs) is indicated, and if the EHT-SIG compression field is 0, that is, when the compression mode is not applied, the number of symbols constituting the EHT-SIG field is indicated. If the number of STA or MU-MIMO users indicated by the field indicates 1, this indicates that the PPDU is a SU PPDU.

[0225] Information indicated by bits allocated to two different fields overlapping each other is determined according to whether the PPDU is a SU PPDU, wherein the two different overlapping fields are the EHT-LTF symbol number and mid-interval field and the NSTS and mid-interval field.

[0226] That is, depending on the PPDU type, each of the EHT-LTF symbol number and the mid-period field or the NSTS and the mid-period field may be included. In a 1-bit embodiment, if the value of the EHT-SIG compression field is 1 and the number of MU-MIMO users is 1, the receiving device identifies the received PPDU as a SU PPDU, and recognizes that the bit indicates the NSTS and mid-period fields. If the EHT-SIG compression field is 0, or if not only the value of the EHT-SIG symbol or the MU-MIMO number field does not indicate 1 symbol, but the number of MU-MIMO users is also not 1, the receiving device identifies the received PPDU as a MU PPDU, and recognizes that the bit indicates the EHT-LTF symbol number and the mid-period field.

[0227] Fig.21 (c) illustrates an example of the format of the PPDU type specific field when the PPDU type field of the VD field indicates that the received PPDU is a TB PPDU. The TB PPDU includes only the spatial reuse field and the puncturing pattern field.

[0228] The spatial reuse field may be interpreted with the value of the bandwidth field, and signals the frequency bands that can be spatially reused in the total bandwidth indicated by the bandwidth field and the transmit power limit of the case where spatial reuse is applied. If the BW field indicates 20MHz, the spatial reuse field signals the transmit power limit and whether spatial reuse of the corresponding frequency band is possible. If the bandwidth field indicates 40MHz, the spatial reuse 1 field signals the transmit power limit and whether spatial reuse is possible for the first 20MHz, and the spatial reuse 2 field signals the transmit power limit and whether spatial reuse is possible for the second 20MHz.

[0229] If the Bandwidth field indicates 80 MHz, 160 MHz, 240 MHz, and 320 MHz, the Spatial Reuse 1, 2, 3, and 4 fields signal the transmit power limit and whether spatial reuse is possible for 1 / 4 of the corresponding bandwidth (40 MHz for 160 MHz and 80 MHz for 320 MHz).

[0230] The puncturing pattern field signals the puncturing pattern to be generated when uplink MU OFDMA is performed on the TB PPDU, and the STA and AP of the neighboring BSS can obtain additional information required for spatial reuse via the puncturing pattern information of the UL PPDU received by the STA and the AP itself. The PPDU type combined with the UL MU OFDMA transmission (the final type received by the AP) may be different from the type signaled in the puncturing pattern of the TB PPDU because actual uplink transmission does not occur in some bandwidths according to the CCA result of the UL STA.

[0231] Fig. 22 An embodiment of an uncompressed type of EHT-SIG according to an embodiment of the present invention is illustrated.

[0232] Fig. 22 The EHT-SIG of (a) is used for OFDMA MU PPDU and includes a common field, an RU allocation field, and a user-specific field. Each field name in the EHT-SIG field may vary, and the classification of the field may not be specified.

[0233] Fig. 22(b) illustrates an example of the format of a common field included in the EHT-SIG field. The common field may include at least one field that cannot be included due to the bit size limit of the VD field of the U-SIG field. For example, the common field may include the same field as the field shown in the HE-SIG-A field of 11ax (such as LDPC additional symbol segmentation, STBC, pre-FED fill factor, GI-LTF size and / or Doppler field) or a field having the same function as the field shown in the HE-SIG-A field of 11ax, and may be allocated bits equal to or greater than the same field of 11ax. The EHT-SIG common field may include one symbol, and for this purpose, 26 bits may be allocated, and the EHT-SIG common field may be compiled with MCS 0.

[0234] The "number of RU allocation fields" can be signaled Fig. 22 (c) The "RU allocation field number" exists in the EHT-SIG RU allocation field and may include 4 bits or 3 bits. Unlike 11ax, the "RU allocation field number" is required because the RU allocation subfield of 11be does not appear in a fixed number according to the bandwidth.

[0235] In the case of 11ax, if the PPDU bandwidth is 40MHz or less, one RU allocation field appears in each of content channels 1 and 2, if the PPDU bandwidth is 80MHz, two RU allocation fields appear in each of content channels 1 and 2, and if the PPDU bandwidth is 160(80+80)MHz, four RU allocation fields appear in each of content channels 1 and 2. On the other hand, in the RU allocation field of 11be, in each content channel 1, a fixed number of RU allocation fields according to the PPDU bandwidth do not appear, and a flexible number of RU allocation fields according to RU configuration and combination within the bandwidth may be included.

[0236] If 4 bits are allocated to the RU allocation number field, in order to signal the presence of one RU allocation field in the EHT-SIG RU allocation field, the value of the RU allocation number field may be 0000 (= 1-0). In a 4-bit embodiment, in order to signal the presence of 16 RU allocation fields in the EHT-SIG RU allocation field, the value of the RU allocation number field may be 1111 (= 16-1). The RU allocation number field indicates the number of RU allocation fields of the content channel including the RU allocation number field. Therefore, when the number of RU allocation fields shown in different content channels is different, the RU allocation number field may appear differently in each content channel.

[0237] Fig. 22(c) illustrates an example of the format of the EHT-SIG RU allocation field. The EHT-SIG RU allocation field appears only in the OFDMA MU PPDU and may not appear in the EHT-SIG field of the SU PPDU, TB PPDU, and full BW MU-MIMO due to compression.

[0238] 8 or more bits may be allocated to the RU allocation field. The EHT-SIG RU allocation field includes N RU allocation fields, and N may be indicated by the RU allocation number field shown before the EHT-SIG RU allocation field. The N RU allocation fields may appear earlier in the EHT-SIG RU allocation field in the order of including the lowest frequency RU among the RUs included in each RU allocation field.

[0239] As an example of the order of fields shown in the RU allocation field, assume that four RU allocation fields signal subfield #1 = [-1012: -771 & -495: -254] (two 242-tone RUs), subfield #2 = [-770: -529] (242-tone RUs), subfield #3 = [12: 529 & 770: 1012] (484-tone RUs, 242-tone RUs), and subfield #4 = [-253: -12 & 529: 770] (two 242-tone RUs). In this case, subfield #1 with the RU at -1012 appears first in the RU allocation field, subfield #2 with the RU at -770 appears second, subfield #4 with the next lower frequency RU at -253 appears third, and subfield #3 where the lowest frequency of RUs is 12 may appear last in the RU allocation field.

[0240] The RU allocation field signals the configuration of small RUs including RUs of 26, 52, and 106 tone sizes within 20 MHz, and the RU allocation field may include RUs of 78 (26+52 or 52+26) tones and RUs of 132 (26+106 or 106+26) tones, the above 78 (26+52 or 52+26) tone RUs are allocated at one time in which RUs of 26 and 52 tone RUs are shown continuously, and the above 132 (26+106 or 106+26) tone RUs are allocated at one time in which RUs of 26 and 106 tone RUs are shown continuously. The RU allocation subfield signals large RUs of 242 tones or more in size, and may signal the combination of RUs constituting each large RU and the positional relationship of the constituting RUs, so as to signal the combination and position of discontinuously located large RUs. Reference will be made to Fig.23An embodiment describes a method for RU configuration and allocation for signaling using the RU allocation subfield. The Center 26 RU field indicates whether 1, 2, and 4 center 26 tone RUs present in 80 MHz, 160 MHz, and 320 MHz are used, respectively. One or more bits may be allocated to the Center 26 RU field, and if the PPDU BW is 40 MHz or lower, the Center 26 RU field may not be displayed due to compression. In a bit embodiment, the Center 26 Tone RU field of the 80 MHz PPDU indicates whether the center 26 tone RU located in the middle of 80 MHz is used, and the same value (e.g., 1) is shown in the Center 26 Tone RU field of all EHT-SIG content channels. If the value of the Center 26 Tone RU field is 1, a field indicating the STA to which the corresponding center 26 tone RU has been allocated may be included. Fig. 9 (d) in the EHT-SIG User Specific Field. In a 1-bit embodiment, for each of the two EHT-SIG content channels, the Center 26 Tone RU field of the 160 MHz PPDU is repeated, the Center 26 Tone RU field of content channel 1 indicates whether the Center 26 Tone RU of 80 MHz present at a relatively lower frequency is used, and the Center 26 Tone RU field of content channel 2 may indicate whether the Center 26 Tone RU of 80 MHz present at a relatively higher frequency is used. In a 1-bit embodiment, if 4 channels are used for 240 MHz and 320 MHz PPDUs, the Center 26 Tone RU fields present in content channels 1, 2, 3, and 4 may indicate whether the first, second, third, and fourth (in ascending order of frequency) Center 26 Tone RUs are used, respectively.

[0241] In a 2-bit embodiment, in order to signal whether to use the four center 26 tone RUs present in the 320 MHz PPDU, a 2-bit center 26 tone RU field may be shown in each of content channel 1 and content channel 2. The 2-bit center 26 tone RU field of content channel 1 may have values ​​such as 00, 01, 10, 11 to signal whether to use the first and second center 26 tone RUs in ascending frequency order or the first and third center 26 tone RUs in ascending frequency order. The 2 bits of content channel 2 may indicate whether to use the third and fourth center 26 tone RUs or the second and fourth center 26 tone RUs. For example, if the 1-bit center 26 tone RU field is signaled as "1" (used), one EHT-SIG user-specific field is shown to indicate the STA to which the center 26 tone RU has been allocated in the corresponding content channel. Alternatively, if the 2-bit center 26-tone RU field is signaled as '11', the EHT-SIG user-specific fields of two STAs to which the center 26-tone RU has been allocated are respectively shown in the corresponding content channels.

[0242] Fig. 9 (d) illustrates an embodiment of the EHT-SIG user specific field. The basic function of the EHT-SIG user specific field can be used in the same manner as the HE-SIG-B user specific field of 11ax, and each field included in the EHT-SIG user specific field can also be used in the same manner as the corresponding field of 11ax. However, 4 bits are allocated to NSTS to signal 16 streams.

[0243] In addition to the elements represented in the embodiment of FIG. 9( d ), in order to signal one or more RUs as a single user-specific field, an additional RU indicator field may be included, wherein the additional RU indicator field is used to indicate the presence or absence of an additional allocated RU other than the RU corresponding to the user-specific field. If the additional RU indicator field indicates that there is an additional RU allocated to the receiving device, the receiving device checks the user-specific field located after the corresponding user-specific field to identify the additional RU allocated to the STA-ID of the receiving device.

[0244] Fig.23 An example of resource unit configuration based on a field for allocating resource units according to an embodiment of the present invention is illustrated.

[0245] Reference Fig.23 , multiple RUs can be allocated to a terminal, and the multiple allocated RUs can have different numbers of tones or different frequency bands.

[0246] Specifically, Fig.23 (a) illustrates an example of RU configuration within 20MHz, which can be indicated by the RU allocation field. In this embodiment, it is assumed that 26, 52, and 106 tone sizes correspond to basic small RUs, and 78 (26+52 or 52+26) tone size RUs, 132 (26+106 or 106+26) tone size RUs, and 158 (52+106 or 106+52) tone size RUs that can be configured as combinations of basic small RUs are defined as small RUs.

[0247] In an embodiment of allocating small RUs present in the 20MHz band, the RUs in the 20MHz band may be signaled as nine 26-tone RUs, and these RUs may be allocated to nine receiving devices, respectively. In another embodiment, after the 20MHz band is signaled with a combination of a 26-tone RU and a 52-tone RU, each of the 26-tone RU and the 52-tone RU may be allocated to a receiving device, or the consecutively arranged 26-tone RU and the 52-tone RU may be allocated to a specific receiving device at one time. As another embodiment, after the 20MHz band is signaled with a combination of a 26-tone RU, a 52-tone RU, and a 106-tone RU, each of the 26-tone RU, the 52-tone RU, and the 106-tone RU may be allocated to a receiving device, or the consecutively arranged 26-tone RU and the 106-tone RU may be allocated to a specific receiving device at one time. In this embodiment, a 106-tone size RU or a consecutive 106+26-tone RU (or 26+106-tone RU) may be repeatedly allocated to one or more receiving devices via MU-MIMO. In this embodiment, in order to allocate the 78-tone RU and the 132-tone RU to the receiving device, a bit combination indicating the 78-tone RU (26+52 or 52+26 type) and the 132-tone RU (26+106 or 106+26 type) is defined in the RU allocation field, or after signaling the 20 MHz band with a combination of the 26-tone RU, the 52-tone RU and the 106-tone RU, the two RUs can be allocated to the receiving device by using a user-specific field.

[0248] Alternatively, in order to allocate two basic small RUs to the receiving device, signaling may be additionally performed in a user-specific field of the receiving device corresponding to the first basic RU according to an ascending order of frequency, wherein the signaling is used to determine whether to use (allocate) a subsequent basic small RU located immediately after the corresponding small RU. Alternatively, in order to signal whether a subsequent small RU located immediately after is used, the user-specific field may include an additional RU field including 1 bit.

[0249] Fig.23 (b) illustrates the configuration of RUs of 20 MHz or higher that can be indicated by the RU allocation field. Fig.23 In (b), 242-tone RU, 484-tone RU, 996-tone, 996×2-tone, 996×3-tone and 996×4-tone RU can be defined as basic large RU, and 242+484-tone RU, 242+996-tone RU, 484+996-tone RU, 484+996×2-tone RU, 484+996×3-tone RU and 996×4-tone size RU that can be configured using a combination of basic large RUs can be defined as large RU.

[0250] In an embodiment for allocating a large RU of 20 MHz or higher, after a 20 MHz (242 tone size) RU is signaled in the RU allocation field, one or more user-specific fields corresponding to the RU allocation field may be signaled to allocate a 20 MHz RU to one or more receiving devices. Alternatively, a 40 MHz, 80 MHz, 160 MHz, 240 MHz, or 320 MHz (484, 996 (or 484+484), 996x2, 996x3, or 996x4 tone, respectively) RU allocation may be performed in the same manner as a 20 MHz RU allocation. To signal a large RU in addition to a basic large RU, the RU allocation field may include a bit combination indicating a 242+484 tone RU, a 242+996 tone RU, a 484+996 tone RU, a 484+996 tone RU, a 484+996x2 tone RU, and a 484+996x3 tone RU.

[0251] Fig.23 (c) illustrates an example of a 60MHz RU configuration. In an embodiment of 60MHz RU allocation, in order to signal a 242+484-tone RU (60MHz size) located on the 80MHz band, the RU allocation field classifies the RU into 4 types of 242+484-tone RUs according to the location of the excluded 20MHz band in the four 20MHz bands (when the 80MHz band is divided into four 20MHz bands). The excluded 20MHz may correspond to a band allocated to another device.

[0252] For example, a 484+242 tone RU may be allocated for transmission of an 80 MHz EHT PPDU to which OFDMA is not applied. The 484+242 tone RU may be obtained by puncturing one of four 242 tone RUs in the 80 MHz EHT PPDU. The data subcarriers of the 484+242 tone RU include the data subcarriers of the 484 tone RU and the 242 tone RU constituting the 484+242 tone RU.

[0253] That is, the 484+242 tone RU may be configured by puncturing one of the four 242 tone RUs of the 80 MHz EHT PPDU. In this case, the 484 tone RU may include two 242 tone RUs, and the punctured 242 tone RU may be located in the middle.

[0254] Alternatively, if some of the four 242-tone RUs are allocated to other terminals in the EHT PPDU, the 484+242-tone RU may be allocated to the terminal. That is, for the 484+242-tone RU, when two terminals receive the 80MHz EHT PPDU, if one of the 242-tone RUs is allocated to one of the two terminals, multiple RUs of 484+242-tone discontinuities may be allocated to the remaining terminals.

[0255] Fig.23 (d) illustrates an embodiment of a 120MHz RU configuration. In the embodiment of 120MHz RU allocation, in order to signal a 484+996 tone RU (120MHz size) located in the entire 160(80+80)MHz band, the RU allocation field can classify the RU into 4 types of 484+996 tone RUs according to the position of the excluded 40MHz band in the four 40MHz bands (when the 160MHz band is divided into four 40MHz bands). In the same manner as the above-mentioned 60MHz and 120MHz RU embodiments, a 140MHz RU configuration within a 160MHz bandwidth, a 220MHz and 200MHz RU configuration within a 240MHz bandwidth, and a 280MHz and 240MHz RU configuration within a 320MHz bandwidth can be classified and indicated according to the size and position of the excluded bands.

[0256] When using Fig.23 When the RU allocation field is described in the embodiment, even if two consecutive basic small RUs are allocated or a large RU including two or more basic large RUs is allocated, a user-specific field for a single receiving device may be included only once in one content channel among all content channels.

[0257] For example, a 996+484 tone RU may be allowed in a 160 / 80+80(TBD)MHz EHT PPDU to which OFDMA is not applied. The 996+484-tone RU may be obtained by puncturing one of the four 484-tone RUs in the 160 / 80+80(TBD)MHz EHT PPDU. That is, similar to the 484+242 tone RU, the 996+484 tone RU may be configured by puncturing one of the four 484-tone RUs of the 80MHz EHT PPDU. In this case, the 996 tone RU may include two 484 tone RUs, and the punctured 484 tone RU may be located in the middle.

[0258] The data subcarriers of the 996+484-tone RU may include data subcarriers of the 996-tone RU and the 484-tone RU constituting the 996+484-tone RU.

[0259] That is, not only a single RU can be allocated to a STA, but also multiple RUs can be allocated to a STA. In this case, the number of tones (or frequency bands) of the allocated RUs can be different from each other. In this case, RUs of different tones can be obtained by perforating specific RUs between consecutive RUs.

[0260] Fig.24 An example of an EHG-SIG field when non-OFDMA PPDU is applied according to an embodiment of the present invention is illustrated.

[0261] Fig.24 FIG. 8 (a) shows an example of the format of the EHT-SIG field included in the non-OFDMA MU PPDU to which OFDMA is not applied. Fig.24 As shown in (a), unlike the EHT-SIG field of the FDMA MU PPDU to which OFDMA is applied, for the EHT-SIG field of the non-OFDMA MU PPDU, the EHT-SIG RU allocation field is compressed and not included in the EHT-SIG field.

[0262] That is, when the compressed mode is not applied by indicating that the compressed mode is not applied by the compressed field included in the U-SIG (non-compressed mode), the EHT-SIG RU allocation field may be included in the EHT-SIG field. In this case, the EHT-SIG RU allocation field may be included in at least one content channel included in the EHT-SIG field.

[0263] Specifically, the EHT-SIG compression field of the U-SIG field is used to signal whether the RU allocation field is included in the EHT-SIG field. For non-OFDMA MU PPDU, OFDMA is not applied, and the MU PPDU is transmitted to all receiving devices by using the same RU, thereby not performing separate RU allocation for each receiving device.

[0264] However, within the PPDU bandwidth signaled in the U-SIG field, only the type of applied puncturing (preamble puncturing) is signaled, and the receiving device can therefore identify the MU-PPDU type (RU configuration). That is, if a non-OFDMA PPDU to which OFDMA is not applied is transmitted, the U-SIG field may include a perforated channel information field, which indicates a pattern of RUs perforated in the total bandwidth of the transmitted PPDU. If the STA receives a non-OFDMA PPDU from the AP, the RUs perforated in the total bandwidth of the transmitted PPDU can be identified via a specific field (perforated channel information field) included in the U-SIG field of the non-OFDMA PPDU, and the non-OFDMA PPDU can be received in RUs other than the perforated RUs. In this case, the perforated channel information field can indicate the pattern of the perforated RUs to the STA via a bitmap format.

[0265] The EHT-SIG field of the non-OFDMA PPDU includes 2 to 16 user-specific fields, and each user-specific field includes the STA-ID of a different receiving device. The user-specific field may include a user block field including a CRC and a tail in units of 2, and the last user block field may include a user-specific field, a CTC, and a tail.

[0266] Fig.24 (b) illustrates an example of the EHT-SIG common field #1 of the non-OFDMA MU PPDU. The EHT-SIG common #1 field included in the non-OFDMA MU PPDU may have a puncturing pattern field, and the puncturing pattern field may be shown in all or some bits of the RU allocation number field of the EHT-SIG common field included in the OFDMA PPDU to which all or some bits have been allocated. In an embodiment, the puncturing pattern field may be signaled by allocating 3 bits from 4 bits of the RU allocation number subfield of the OFDMA PPDU EHT-SIG common field. The remaining 1 bit may be displayed as a reserved field, or may be compressed so as not to be displayed.

[0267] The puncturing pattern field signals the discontinuity type (puncturing pattern) of the RU of the channel through which the non-OFDM APPDU is transmitted in the total bandwidth indicated by the bandwidth field of the U-SIG field. The signaling can be performed using a defined puncturing pattern, or the signaling can be performed using a bitmap by dividing the total bandwidth or bandwidth other than the main 20MHz into specific frequency domain units (20MHz, 40MHz, and 80MHz).

[0268] Through the bandwidth field of the U-SIG field, the RU allocation field of the EHT-SIG field, and the puncturing pattern field, the receiving device can identify the RU combination through which the receiving device itself needs to receive the PPDU within the bandwidth. That is, the STA can identify the total bandwidth in which the PPDU is sent via the bandwidth field included in the U-SIG, and can identify the punctured RUs in the total bandwidth via the puncturing pattern field. If OFDMA is not applied, the RUs of the STA used for MU-MIMO are equally divided, and therefore the RU allocation field can be omitted. However, if OFDMA is applied, the RU allocation field can be included in the common field of the EHT-SIG field to indicate to the terminal the RU configuration for allocating RUs to the corresponding terminal, and the STA can identify the configuration of the RU via the RU allocation field.

[0269] As described above, the STA can identify the RU that actually transmits the PPDU based on the Bandwidth field and the Puncture Pattern field. The remaining fields after excluding the Puncture Pattern field have the same configuration and function as the fields constituting the OFDMA MU PPDU EHT-SIG common fields.

[0270] Fig.24 (c) illustrates an example of the EHT-SIG user specific field #1 of the non-OFDMA MU PPDU. In the EHT-SIG user specific field #1 of the non-OFDMA MU PPDU, the user specific field of the device may be as many as the maximum number of serviceable MU-MIMO users, where the device will receive the PPDU by using a discontinuous channel signaled via the puncturing pattern field of the EHT-SIG common field and the bandwidth field of the U-SIG field.

[0271] Therefore, 16 antennas will be used for 11be, and thus in the EHT-SIG User Specific #1 field of the non-OFDMA MU PPDU, 2 to 16 user specific fields including STA-IDs of different receiving devices may be shown.

[0272] The STA-ID field may include a STA-ID for identifying a receiving device that needs to receive the corresponding non-OFDMA MU PPDU, and 11 bits may be allocated. The MCS field indicates the modulation and coding scheme applied to the data field of the receiving device corresponding to the STA-ID, and 4 bits may be allocated. 1 bit is allocated to the coding field, and 0 or 1 may be expressed as indicating the coding technique used in BCC and LDPC. The spatial configuration field indicates the number of MU-MIMO spatial streams allocated to the receiving device corresponding to the STA-ID, and 4 bits may be allocated.

[0273] Fig.25 An example of an EHT-SIG field when a single user (SU) PPDU is applied according to an embodiment of the present invention is illustrated.

[0274] Reference Fig.25 , if the PPDU type is SU PPDU, some fields of MU PPDU can be omitted.

[0275] Specifically, Fig.25 (a) illustrates an example of an EHT-SIG field of a SU PPDU, and in the EHT-SIG field of the SU PPDU, the RU allocation field may be compressed and not included, as in the non-OFDMA MU EHT-SIG. An EHT-SIG user-specific field #2 may be included in the user-specific field of the SU PPDU. Specifically, the SU PPDU may include a field that is not included in the EHT-SIG field due to a size limitation of the U-SIG field and a specific field indicating the number of users of MU-MIMO (e.g., an EHT-SIG symbol or a number of MU-MIMO users field, etc.). If the value of the specific field indicates that the number of STAs (or the number of users) is 1, the PPDU type is a SU PPDU, and if the value of the specific field indicates that the number of STAs is 2 or more, the PPDU type may be a MU PPDU, and the number of user fields included in the user-specific field may be determined according to the number of STAs.

[0276] In the case of a SU PPDU, the number of STAs participating in MU-MIMO is 1, and the user specific field may thus include one user field.

[0277] Fig.25 (b) illustrates an example of the EHT-SIG common field #1 of the SU PPDU. The SU PPDU EHT-SIG common field #1 may have the same field configuration and function as the non-OFDMA EHT-SIG common field #1. The puncturing pattern field of the SU PPDU EHT-SIG common field #1 may indicate the same pattern as the puncturing pattern field of the non-OFDMA EHT-SIG common field #1, or may indicate a type in which some patterns have been removed / added / changed.

[0278] Fig.25(c) illustrates an example of an EHT-SIG user-specific field #2 of a SU PPDU. In the case of a SU PPDU, one EHT-SIG user-specific field may be included. The STA-ID field may include a STA-ID for identifying a receiving device that needs to receive the corresponding SUPPDU, and 11 bits may be allocated. The MCS field may include a coded MCS of the SU PPDU, and 4 bits may be allocated. A bit of 1 is allocated to the coding field, and 0 or 1 may be represented as indicating the coding technique used in BCC and LDPC. A reserved field may be added to have the same size and structure as the EHT-SIG user-specific field of an OFDMA MU PPDU and a non-OFDMA MU PPDU as other PPDUs, or may be compressed so as not to be included.

[0279] If the reserved field is included, the bits allocated to the reserved field may be used to improve the puncturing resolution of the SU PPDU. For example, the puncturing pattern field of the EHT-SIG common field may appear again in the reserved field, and the puncturing pattern field of the common field and the puncturing pattern of the user-specific field may indicate the discontinuous channel types of the primary 160 MHz and the secondary 160 MHz, respectively.

[0280] As another example, the puncturing pattern of the common field and the puncturing pattern of the user-specific field can be combined to use an 8-bit bitmap to indicate a non-contiguous type of RU in the bandwidth. In this case, each bandwidth corresponding to 1 / 8 of the total bandwidth can correspond to 1 bit, and the bit corresponding to the area including the main 20MHz (the first bit) can correspond to a bandwidth that does not include the main 20MHz. In the example of an 8-bit bitmap indicating a discontinuous type of 160MHz bandwidth, each 20MHz of 160MHz corresponds to 1 bit, and the 8-bit bitmap can be represented as 0011 0000 or 1100 1111, indicating that the auxiliary 40MHz has been punctured. In one embodiment of an 8-bit bitmap, 10000000 or 0111 1111 can be signaled in the 8-bit bitmap to signal that only the auxiliary 20MHz channel of the 320MHz BW is punctured.

[0281] In this case, in an 8-bit bitmap representing 320 MHz, the first bit corresponds to the secondary 20 MHz, the second bit corresponds to the secondary 40 MHz, and the third bit corresponds to 40 MHz, which corresponds to the lower frequency in the secondary 80 MHz. In another embodiment of the 8-bit bitmap, 0100 0000 or 1011 1111 may be signaled in the 8-bit bitmap to signal that the secondary 40 MHz channel of the 320 MHz BW has been punctured. In an embodiment of the 8-bit bitmap, the BW region corresponding to each bit may be determined based on a positional relationship with the primary 20 MHz or in ascending order of frequency.

[0282] Fig.26 An embodiment of large resource unit (RU) allocation according to an embodiment of the present invention is illustrated.

[0283] Fig.26 (a) illustrates an example of the size and configuration (combination) of discontinuous large RUs for transmitting MU PPDUs to which OFDMA is applied when the total bandwidth for PPDU transmission is 320 MHz. Fig.26 For the OFDMA MU PPDU in (a), a single RU or a combination of two non-contiguous RUs can be allocated to the receiving device within the 320 MHz bandwidth. Fig.26 As shown in (b), a 20+40MHz RU type in which the second 20MHz RU is excluded at 80MHz is signaled as RU#1 including the lowest frequency, and RU#1 can be located in the first RU allocation field of the RU allocation field. RU#2 including the second lowest frequency is signaled as a 20MHz (242 tone size) RU and can be located in the second RU allocation field. RU#3 including the third lowest frequency is signaled as an 80MHz (996 tone size) RU and can be located in the third RU allocation field. RU#4 including the fourth lowest frequency is signaled as an 80+40MHz RU type in which the third 40MHz is excluded at 160MHz, and can be located in the fourth RU allocation field. RU#5 located at the highest frequency is signaled as a 40MHz (484 tone size) RU and can be located in the last field. This embodiment includes five RU allocation fields, therefore, as Fig.26 As shown in (c), the RU allocation quantity subfield of the EHT-SIG common field can be configured to indicate a value of 5.

[0284] Fig. 27 An embodiment of single content channel signaling for OFDMA MU PPDU according to an embodiment of the present invention is illustrated.

[0285] Fig. 27 Graphics for Fig.26FIG. 1 is a signaling example of a single content channel of a 320 MHz OFDMA MU PPDU. Fig. 27 , it is assumed that #RU1 performs MU-MIMO transmission assigned to 4 receiving devices, and #RU2, #RU3, #RU4 and #RU5 simultaneously perform MU-MIMO transmission assigned to 2 receiving devices, 5 receiving devices, 3 receiving devices and 1 receiving device, respectively.

[0286] Fig. 27 (a) illustrates an example of an RU allocation field for a single content channel. In order to signal the presence of four receiving devices to which #RU 1 is to be allocated, the first RU allocation field may use some bits allocated to the RU allocation field (#RU1) to signal a value obtained by subtracting 1 from the number of user-specific fields corresponding to the RU allocation field. In the example of the RU allocation field (#RU1), the RU allocation field (#RU1) may have a value of xxx xxxx 0011 (=4-1), where the receiving device may ascertain based on xxx xxxx that the RU configuration corresponds to a (20+40)MHz RU configuration, where the second 20MHz of the 80MHz is excluded. And the receiving device may ascertain based on the last 4 bits that four user-specific fields corresponding to the RU will be included. In the same manner as the RU allocation field (#RU1), the RU allocation fields (#RU2, #RU3, #RU4, and #RU5) indicate yyyyyyy 0001 (=2-1), zzz zzzz0100 (=5-1), qqq qqqq 0010 (=3-1), and ttt tttt 0000 (=1-1), where each RU allocation field can signal the number of RU configurations and corresponding user-specific fields. In this embodiment, 7 bits other than the last 4 bits of each RU allocation field indicate the configuration and location of the RU, which is indicated by each RU allocation field.

[0287] Fig. 27(b) illustrates an example of user-specific fields for a single content channel. The number of user-specific fields is shown, which corresponds to the number based on the total number of receiving devices signaled by each RU allocation field. Therefore, the receiving device can recognize that the STA-ID indicated in the user-specific field #RU1_1, the user-specific field #RU1_2, the user-specific field #RU1_3, and the user-specific field #RU1_4 is the ID of the STA that is to use the RU (20+40MHz) indicated by the RU allocation field (#RU1). After receiving all the RU allocation fields, each receiving device can identify the configuration and position of each RU in the total BW by filling the RU configuration signaled by the RU allocation field starting from the low frequency, and can check the STA-ID of the user-specific field shown subsequently to identify the RU allocated to the receiving device itself.

[0288] Fig.28 An embodiment for signaling two content channels of a specific frequency band according to an embodiment of the present invention is illustrated.

[0289] Fig.28 (a) shows an example of an RU allocation field included in two content channels. Fig.28 In (a), two content channels 1 and 2 may include an RU allocation field of the same RU configuration, which is used to signal 0 receiving devices or one or more receiving devices. When the EHT-SIG field is configured so that the lengths of the two content channels are similar, the transmitting device determines which content channel is used to signal a receiving device that is not 0 for a single RU. For example, the RU allocation field (#RU1) shown in content channel 1 is signaled as xxx xxxx0011 (=4-1), and the RU allocation subfield (#RU1') shown in content channel 2 may show a bit combination indicating the same RU configuration as #RU1 + empty users.

[0290] exist Fig.28 In (b), the number of user-specific fields shown in the two content channels corresponds to the total number of receiving devices signaled in the RU allocation field of each content channel. Therefore, in this embodiment, four user-specific fields of the RU allocation field (#RU1) for content channel 1 are illustrated in content channel 1, and no user-specific field of the RU allocation field (#RU1') for common channel 2 is shown in common channel 2. The reason why two RU allocation fields (#RU1 and #RU1') for the same RU configuration are displayed in each content channel even if there are no users corresponding to the RU allocation fields is that even if the RU allocation field displayed in one content channel is decoded, it enables the receiving device to recognize the location of the RU configuration and the total BW.

[0291] Fig.29 Another embodiment of signaling two content channels of a specific frequency band according to an embodiment of the present invention is illustrated.

[0292] Fig.29 FIG. 8 (a) illustrates another embodiment of an RU allocation field for two content channels.

[0293] like Fig.29 As shown in (a), content channel 2 shows the RU allocation field of the same RU configuration, wherein the number of receiving devices is the same or the number of receiving devices differs by one. In an embodiment, the RU allocation field (#RU1) shown in content channel 1 is signaled as xxx xxxx 0001 (=2-1), and the RU allocation field (RU1) shown in content channel 2 is also signaled as xxx xxxx 0001 (=2-1). In one embodiment, the RU allocation field (#RU3) shown in content channel 1 can be signaled as zzz zzzz 0010 (=3-1), and the RU allocation field (#RU3') can be signaled as zzz zzzz 0001 (=2-1).

[0294] Fig.29 (b) illustrates another example of user-specific fields included in two content channels. The number of user-specific fields shown in each content channel corresponds to the total number of receiving devices signaled in the RU allocation field of each content channel 1. Therefore, in this embodiment, two user-specific fields for the RU allocation field (#RU1) are shown in each of content channel 1 and content channel 2. In this embodiment, user-specific fields for corresponding RU allocation fields are included in content channels 1 and 2 and are alternately shown, so that the EHT-SIG lengths of the two content channels can be determined to be similar, and as a result, the padding for matching the lengths of the two content channels can be reduced. RU allocation fields indicating the same RU configuration are shown in both content channels 1 and 2, so that the receiving device can identify the location of the RU configuration and the total BW even if only the RU allocation field shown in one content channel is decoded.

[0295] Fig.30 Another embodiment of signaling two content channels of a specific frequency band according to an embodiment of the present invention is illustrated.

[0296] Fig.30 An embodiment of two content channels for an OFDMA MU PPDU transmitted at 320 MHz is illustrated, which is the total bandwidth for PPDU transmission, such as Fig.26 shown.

[0297] exist Fig.30In the embodiment of the present invention, 320 MHz is divided into two 160 MHz, and signaling of a single content channel for each 160 MHz is performed. As a result, signaling of an OFDMA MU PPDU of 320 MHz can be performed via two content channels.

[0298] Therefore, in order to understand this embodiment, it can be seen that Fig. 27 The single content field embodiment of the present invention is applied to 160 MHz to provide a description of the omitted part. This embodiment may be effective when the 320 MHz (or 160 MHz) operation of 11be is performed by two 160 MHz (or 80+80 MHz) operations that are substantially physically separated. This embodiment may also be effective when the 160+80 MHz operation is performed via the 160 MHz operation and the 80 MHz operation that are significantly physically separated.

[0299] Fig.30 (a) shows another example of an RU allocation field included in two content channels so as to be transmitted. Fig.30 In (a), the two content channels 1 and 2 perform different signaling of 160MHz. To this end, in this embodiment, the EHT-SIG common field may include a RU allocation number subfield in each of the primary 160MHz and the secondary 160MHz, and transmit them. That is, a structure can be obtained in which the signaling of the primary 160MHz and the secondary 160MHz are separated from the EHT-SIG common field. All RU allocation fields (#RU1, #RU2, and #RU3) shown in content channel 1 signal a combination of RUs included in the primary 160MHz, and in all RU allocation fields (#RU4 and #RU5) shown in content channel 2, a combination of RUs included in the secondary 160MHz can be allocated to the STA.

[0300] #RU1, #RU2, and #RU3 may be arranged in the order of RU configuration including lower frequencies within the primary 160MHz, and #RU4 and #RU5 may be arranged in the order of RU configuration including lower frequencies within the secondary 160MHz. Therefore, the receiving device may only recognize the RU configuration and position of the 160MHz band in which the user-specific field including the STA-ID of the receiving device itself is shown, and then the receiving device may identify the RU allocated thereto.

[0301] Fig.30 (b) illustrates another embodiment of a user-specific field included in each of two content channels. Fig.30 In case (b), due to the structure in which the content channels of the primary 160 MHz and the secondary 160 MHz are divided, padding for matching the lengths of the content channels 1 and 2 can be omitted.

[0302] Fig.31 and Fig.32 An embodiment of four content channels of an OFDMA MU PPDU for a specific frequency band according to an embodiment of the present invention is illustrated.

[0303] Reference Fig.31 and Fig.32 , if in Fig.26 The total bandwidth of the PPDU transmission described in is 320 MHz, and the OFMDA MUPPDU can include four content channels.

[0304] Specifically, Fig.31 yes Fig.28 The two content channels embodiment described in is extended to the case of four content channels, and Fig.32 yes Fig.16 The case where the two content channels described in is expanded to four content channels.

[0305] Fig.33 Another embodiment of signaling four content channels of a specific frequency band according to an embodiment of the present invention is illustrated.

[0306] Fig.33 is with Fig.29 and Fig.30 An embodiment of the present invention is combined with an embodiment in which four content channels can be included in the MU PPDU. Specifically, if the total bandwidth for PPDU transmission is 320 MHz, the 320 MHz can be divided into two segments (primary 160 MHz and auxiliary 160 MHz). Each segment can include two content channels, and the two content channels can optionally include a user-specific field corresponding to the RU allocation subfield.

[0307] Fig.34 An example of a method of configuring resource units of different sizes according to an embodiment of the present invention is illustrated.

[0308] Reference Fig.34 , if the total bandwidth for PPDU transmission is 320 MHz and OFDMA is applied, the OFDMA MUPPDU may include non-contiguous large RUs and small RUs.

[0309] Specifically, in Fig.34 In (a), similar to Fig.26 (a) shows a large RU configuration and a single 20MHz RU is split into 7 small RUs and can be used for PPDU transmission. Fig.34In the example, a single RU includes less than 78 tones, so #RU2 used as a small RU cannot be used for MU-MIMMO, and each of one 78-tone RU and six 26-tone RUs can be allocated to a single receiving device.

[0310] Fig.35 Another example of a method of configuring resource units of different sizes according to an embodiment of the present invention is illustrated.

[0311] Fig.35 When the diagram is Fig.34 An example of the RU allocation field when the method described in the embodiment allocates RUs and two content channels are included in the PPDU and transmitted.

[0312] like Fig.35 As shown, for each of content channels 1 and 2, the same larger RU configuration and / or smaller RU configuration may be used, wherein the number of receiving devices receiving content channels 1 and 2 is the same or differs by one. User-specific fields corresponding to RU allocation fields may be alternately included in two content channels and transmitted, wherein the user-specific fields are alternately included in order starting from the content channel of the content channel indicated by the last user-specific field that is not the previous RU allocation field. For example, in the case of content channel 1, the RU allocation field may be located in an odd field, and in the case of content channel 2, the RU allocation field may be located in an even field.

[0313] The user specific field for the first RU allocation field may be configured to be positioned alternately starting from content channel 1 or 2 .

[0314] Fig.35 (b) When the Fig.34 Another example of the format of the user specific field when two content channels are included and transmitted in . The number of user specific fields included in each content channel may be determined based on the number of small RUs having a size smaller than 106 tones, the number of receiving devices to which the small RUs having a size larger than 106 tones are applied, and the sum of large RUs configured via the RU allocation field of each content channel.

[0315] That is, the number of user-specific fields may be equal to the total number of receiving devices to which the RU is allocated.

[0316] Therefore, in Fig.35, content channel 1 and content channel 2 may include two user-specific fields and one user-specific field, respectively, wherein the user-specific field corresponds to the RU allocation field (#RU1) that signals a large RU. In addition, content channel 1 and content channel 2 may include three user-specific fields and four user-specific fields, respectively, wherein the user-specific field corresponds to the RU allocation field (#RU2) that signals a small RU.

[0317] Fig.36 An example of an EHT-SIG repeated within a bandwidth when signaling a content channel according to an embodiment of the present invention is illustrated.

[0318] Reference Fig.36 , at least one content channel included in the EHT-SIG field may be repeatedly transmitted in a predetermined frequency band.

[0319] Specifically, Fig.36 (a) shows a method for sending a Fig.28 and Fig.29 The first method (option 1) of the EHT-SIG field of the two content channels shown. Specifically, according to Fig.36 In the first method of (a), the same common field of the EHT-SIG field can be repeatedly transmitted every 20MHz. That is, content channels 1 and 2 can be repeatedly transmitted alternately every 20MHz, and content channels 1 and 2 can include the same common field. The RU allocation field located after the common field can be transmitted by crossing different RU allocation fields 1 and 2 at adjacent 20MHz. That is, content channels 1 and 2 can include different RU allocation fields.

[0320] User specific fields 1 and 2 corresponding to RU allocation fields 1 and 2 may be respectively repeatedly included in a content channel in which the corresponding RU allocation field is located.

[0321] Fig.23 (b) is used to send a signal including Fig.30 A second method (Option 2) of the EHT-SIG field for two content channels is shown.

[0322] Specifically, according to Fig.36 In the second method of (b), the content channels sent in the respective segments for the total bandwidth (PPDU is sent via the total bandwidth) may include common fields having different information, and in each segment, the common fields including the same information may be repeatedly sent in each predetermined frequency band.

[0323] For example, if the total bandwidth for PPDU transmission is 320 MHz, 320 MHz may be divided into two segments in 160 MHz units. Each of the two divided segments may be referred to as a primary 160 and a secondary 160. The common fields included in the content channels transmitted in the primary 160 and the secondary 160 include different information, wherein the same common fields may be repeatedly included in the content channels in each 160 MHz segment and transmitted every 20 MHz.

[0324] That is, when the total bandwidth is 160 MHz, the total bandwidth may be divided into two segments of 80 MHz. The specific fields of the PPDU may include different contents in the 80 MHz segments, respectively, and each segment may include the same contents every 20 MHz. For example, the common fields of the U-SIG field or the EHT-SIG field of the PPDU may include different contents in the 80 MHz segments, and each segment may include the same contents every 20 MHz.

[0325] For example, in the primary 160 and the secondary 160, the common field may indicate different numbers signaled in the RU Allocation Number subfield. In the RU Allocation fields that appear subsequently, different RU Allocation Fields 1 and 2 are shown in the primary 160 and the secondary 160 MHz, respectively, where each RU Allocation Field is repeated every 20 MHz throughout the 160 MHz. The respective user-specific fields corresponding to the RU Allocation Field 1 and RU Allocation Field 2 shown in the primary 160 and the secondary 160 are repeated in each 160 MHz band in the same manner as the RU Allocation Field.

[0326] In other words, in each content channel, one or more fields corresponding to each other in the same segment may be configured to have the same value, and one or more fields corresponding to each other between different segments may be configured to have different values.

[0327] For example, within the same segment of at least one segment, the same information may be included in at least one field of the same type (or category) field except for the resource unit allocation (RU allocation) field between the second content channel and the first content channel. That is, even in the same segment, when the content channels are different, the resource unit allocation information may be configured as different values ​​or different information.

[0328] If the first content channel and the second content channel include a specific field, a value of the specific field may be identically configured in the same segment but may be differently configured in different segments.

[0329] For example, if the first content channel and the second content channel sent in the first segment include a first common field, which includes at least one field having the same value, and the first content channel and the second content channel sent in the second segment include a second common field, which includes at least one field having the same value, then at least one field included in the first common field and at least one field included in the second common field (of the same type) may include different values ​​or different information.

[0330] Fig.37 Another example of EHT-SIG being repeated within a bandwidth when signaling a content channel according to an embodiment of the present invention is illustrated.

[0331] refer to Fig.37 , the same field in each segment obtained by dividing the total bandwidth may include different information, and the same information may be included in the segment and may be repeatedly transmitted in each predetermined frequency band.

[0332] Specifically, Fig.37 (a) shows that when Fig.32 A first transmission method (option 1) of the EHT-SIG field applicable when four content channels are transmitted is shown. According to an embodiment of option 1, the same common field is repeatedly shown every 20 MHz. In the RU allocation field that appears later, RU allocation fields 1, 2, 3, and 4 are repeatedly shown in 80 MHz units, wherein a channel including RU allocation field 1 may be referred to as content channel 1, a channel including RU allocation field 2 may be referred to as content channel 2, a channel including RU allocation field 3 may be referred to as content channel 3, and a channel including RU allocation field 4 may be referred to as content channel 4. User-specific fields 1, 2, 3, and 4 corresponding to the RU allocation fields included in the RU allocation field may be included in the same content channels as those used for RU allocation.

[0333] Fig.37 (b) shows a method for sending a signal that can be applied to Fig.33 The second method (option 2) of the EHT-SIG field of the embodiment of sending four content channels is shown. According to the embodiment of option 2, the PPDU sent to each segment obtained by dividing the total bandwidth may include different content, wherein, within each segment, the same content may be repeatedly sent in each predetermined frequency band.

[0334] For example, if the total bandwidth is 320MHz and is divided into two corresponding 160MHz segments, different common fields in the main 160 as the first segment and the auxiliary 160MHz as the second segment may be repeatedly included in the content channel and sent every 20MHz. The common field may indicate different quantities signaled in the RU allocation number subfield. In the RU allocation field that appears later, different RU allocation fields 1 and 2 and different RU allocation fields 3 and 4 are included in the main 160 and auxiliary 160, respectively, so as to be sent. RU allocation fields 1 and 2 may be repeatedly included in the content channel every 40MHz in the main 160MHz so as to be sent, and RU allocation fields 3 and 4 may be repeatedly included in the content channel every 40MHz in the auxiliary 160MHz so as to be sent. The user specific fields 1 and 2 corresponding to the two RU allocation fields 1 and 2 shown in the primary 160 MHz are repeated every 40 MHz in the primary 160 MHz, and the user specific fields 3 and 4 corresponding to the two RU allocation fields 3 and 4 shown in the secondary 160 MHz are repeated every 40 MHz in the secondary 160 MHz. The channels in which the four types of RU allocation fields 1, 2, 3, and 4 and the corresponding user specific fields 1, 2, 3, and 4 are shown may be referred to as content channels 1, 2, 3, and 4, respectively.

[0335] That is, in other words, the EHT-SIG field may include at least one content channel, and fields included in a content channel transmitted from a corresponding segment may have different values ​​and may be repeatedly transmitted in each predetermined frequency band within the same segment.

[0336] For example, if the total frequency band is 160 MHz and each segment is 80 MHz, two content channels (a first content channel and a second content channel) may be transmitted in the corresponding segment.

[0337] In this case, the fields constituting the first content channel and the second content channel transmitted from the first segment and the fields constituting the first content channel and the second content channel transmitted from the second segment are the same, but the contents included in the corresponding fields may be different. In the case of occupying 20 MHz, the first content channel and the second content channel transmitted in the first segment and the second segment may be repeatedly transmitted. For example, if the first content channel is transmitted at the lowest 20 MHz of 80 MHz, the second content channel may be transmitted at the subsequent 20 MHz, and then the first content channel may be transmitted at the next 20 MHz.

[0338] That is, in different 80 MHz segments, content channels having the same index have the same field configuration, but contents included in corresponding fields may be different.

[0339] Fig.38 is a flowchart illustrating an example of a method for receiving a PPDU by a terminal according to an embodiment of the present invention.

[0340] refer to Fig.38 , the terminal may receive and decode the PPDU from the AP, wherein some fields of the PPDU sent to different terminals may be configured to have the same values ​​between the different terminals.

[0341] Specifically, the terminal may receive a physical protocol data unit (PPDU) from an access point (AP) (S38010), and may decode the received PPDU (S38020).

[0342] The received PPDU may include a universal signal (U-SIG) field and an extremely high throughput (EHT)-SIG field including at least one content channel, and may be included in at least one PPDU sent to at least one terminal by multi-user (MU) multiple-input multiple-output (MIMO) performed by the AP.

[0343] The at least one content channel may include: a common field in which the same value is configured for the at least one terminal, and a user-specific field individually configured for each of the at least one terminal.

[0344] In this case, at least one field of the terminal specific field may be configured to have the same value between at least one terminal.

[0345] The description of the present invention is for illustrative purposes, and those skilled in the art to which the present invention belongs will be able to understand that the present invention can be easily modified into other specific forms without changing the technical ideas or its essential features. Therefore, it should be understood that the embodiments described above are intended to be illustrative in various senses, rather than restrictive. For example, each component described as a single type can be implemented in a distributed manner, and similarly, the components described in a distributed manner can also be implemented in a combined form.

[0346] The scope of the present invention is indicated by the claims to be described below, rather than the detailed description, and the meaning and scope of the claims and all changes or modifications derived from equivalents thereof should be construed as being included in the scope of the present invention.

Claims

1. A terminal in a wireless communication system, the terminal comprising: Communication module; as well as a processor configured to control the communication module, Wherein, the processor is configured to: Receive a physical protocol data unit PPDU from an access point AP, and decoding the received PPDU, The PPDU includes a universal signal U-SIG field and an extremely high throughput signal EHT-SIG field. The EHT-SIG field includes a first content channel and a second content channel, and The U-SIG field includes a bandwidth field related to the total bandwidth and a mode field related to a puncturing pattern of a resource unit RU according to the total bandwidth.

2. The terminal according to claim 1, in, When the total bandwidth at which the PPDU is transmitted is greater than a specific bandwidth, the total bandwidth includes a plurality of sub-blocks, and Herein, at least one field among two or more fields of the same type constituting the first content channel and the second content channel indicates the same value in the same sub-block among the plurality of sub-blocks.

3. The terminal according to claim 1, in, The puncturing pattern is identified based on a combination of the bandwidth field and the mode field.

4. The terminal according to claim 1, in, When the total bandwidth is changed, the mode field indicates a puncturing pattern that is changed according to the changed total bandwidth.

5. The terminal according to claim 4, in, Puncturing according to the puncturing pattern is applied to the remaining channels in the total bandwidth except for the main 20 MHz channel, and The unit of bandwidth punctured by the puncturing pattern increases as the total bandwidth associated with the bandwidth field increases.

6. The terminal according to claim 2, in, The first content channel and the second content channel are alternately transmitted on a frequency axis at regular frequency intervals in each of the plurality of sub-blocks.

7. The terminal according to claim 2, in, The at least one field includes at least one of a low density parity check code LDPC, an additional symbol segment field, a space time block coding STBC field, a pre-FEC filling factor field, or a guard interval GI+long training field LTF size field.

8. The terminal according to claim 1, in, The first content channel and the second content channel include a common field, and the common field includes the at least one field.

9. A method for receiving data by a terminal in a wireless communication system, the method comprising: Receiving a physical protocol data unit PPDU from an access point AP; as well as decoding the received PPDU, The PPDU includes a universal signal U-SIG field and an extremely high throughput signal EHT-SIG field. The EHT-SIG field includes a first content channel and a second content channel, and The U-SIG field includes a bandwidth field related to the total bandwidth and a mode field related to a puncturing pattern of a resource unit RU according to the total bandwidth.

10. The method according to claim 9, in, When the total bandwidth at which the PPDU is transmitted is greater than a specific bandwidth, the total bandwidth includes a plurality of sub-blocks, and Herein, at least one field among two or more fields of the same type constituting the first content channel and the second content channel indicates the same value in the same sub-block among the plurality of sub-blocks.

11. The method according to claim 9, in, The puncturing pattern is identified based on a combination of the bandwidth field and the mode field.

12. The method according to claim 9, in, When the total bandwidth is changed, the mode field indicates a puncturing pattern that is changed according to the changed total bandwidth.

13. The method according to claim 12, in, Puncturing according to the puncturing pattern is applied to the remaining channels in the total bandwidth except for the main 20 MHz channel, and The unit of bandwidth punctured by the puncturing pattern increases as the total bandwidth associated with the bandwidth field increases.

14. The method according to claim 10, in, The first content channel and the second content channel are alternately transmitted on a frequency axis at regular frequency intervals in each of the plurality of sub-blocks.

15. The method according to claim 10, in, The at least one field includes at least one of a low density parity check code LDPC, an additional symbol segment field, a space time block coding STBC field, a pre-FEC filling factor field, or a guard interval GI+long training field LTF size field.

16. The method according to claim 9, in, The first content channel and the second content channel include a common field, and the common field includes the at least one field.

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