Methods and terminals for transmitting and receiving data in wireless communication systems

Abstract

A method for receiving Physical Layer Protocol Data Units (PPDUs) in a wireless communication system is disclosed. A terminal receives an EHT PPDU from an access point (AP) comprising at least one Extremely High Throughput (EHT)-Signaling (SIG) content channel. Each of the at least one EHT-SIG content channel includes a common field containing at least one first Resource Element (RU) allocation subfield and a user-specific field. The STA can then identify whether the common field also includes at least one second RU allocation subfield, and can decode the PPDU based on whether the common field also includes at least one second RU allocation subfield.

Description

Technical Field

[0001] This invention relates to wireless communication systems, and more specifically, to wireless communication methods and terminals for efficiently transmitting ultra-high-speed signaling field information using signaling in wireless communication systems. Background Technology

[0002] In recent years, with the expansion of mobile device supply, wireless LAN technology, which can provide fast wireless internet services to mobile devices, has gained attention. Wireless LAN technology allows mobile devices, including smartphones, tablets, laptops, portable multimedia players, embedded devices, and more, to wirelessly access the internet in their homes, offices, or specific service areas based on short-range wireless communication technology.

[0003] Since using the 2.4 GHz frequency to support initial wireless LAN technology, the Institute of Electrical and Electronics Engineers (IEEE) 802.11 has commercialized or developed various technical standards. First, IEEE 802.11b, using the 2.4 GHz band, supported a maximum communication speed of 11 Mbps. Compared to the significantly congested 2.4 GHz band, IEEE 802.11a, commercialized after IEEE 802.11b, used the 5 GHz band instead of 2.4 GHz to reduce interference and increased the communication speed to a maximum of 54 Mbps through the use of OFDM technology. However, a drawback of IEEE 802.11a is its shorter communication range compared to IEEE 802.11b. Furthermore, similar to IEEE 802.11b, IEEE 802.11g, using the 2.4 GHz band to achieve a maximum communication speed of 54 Mbps and satisfying backward compatibility, has attracted significant attention and, furthermore, outperforms IEEE 802.11a in terms of communication range.

[0004] Furthermore, IEEE 802.11n has been developed as a technical standard to overcome the limitations of communication speed, a weakness identified in wireless LANs. IEEE 802.11n aims to improve network speed and reliability and extend the operating range of wireless networks. More specifically, IEEE 802.11n supports high throughput (HT), with data processing speeds of up to 540 Mbps or higher, and further, it is based on multiple-input multiple-output (MIMO) technology, where multiple antennas are used on both sides of the transmitting and receiving units to minimize transmission errors and optimize data speed. Additionally, the standard can use a compilation scheme that transmits multiple superimposed copies to increase data reliability.

[0005] With the activation of the wireless LAN supply, and further, with the diversification of applications using wireless LAN, the need for new wireless LAN systems supporting higher throughput (Very High Throughput (VHT)) than those supported by IEEE 802.11n has gained attention. Among these, IEEE 802.11ac supports wide bandwidth (80 to 160 MHz) in the 5 GHz frequency band. The IEEE 802.11ac standard is defined only in the 5 GHz band, but initial 11ac chipsets even support operation in the 2.4 GHz band for backward compatibility with existing 2.4 GHz band products. Theoretically, according to this standard, wireless LAN speeds of up to 1 Gbps can be enabled for multiple stations, and a maximum single-link speed of up to 500 Mbps can be achieved. This is achieved through concepts that expand the wireless interface accepted by 802.11n, such as wider wireless frequency bandwidth (up to 160 MHz), more MIMO spatial streams (up to 8), multi-user MIMO, and high-density modulation (up to 256 QAM). Furthermore, IEEE 802.11ad has been offered as a solution for transmitting data using the 60 GHz band instead of the existing 2.4 GHz / 5 GHz band. IEEE 802.11ad is a transmission standard that provides speeds up to 7 Gbps using beamforming technology and is suitable for high bit-rate motion streaming, such as large-scale data or uncompressed HD video. However, its drawback is that the 60 GHz band is difficult to penetrate obstacles, limiting its use to devices operating in close proximity.

[0006] As a wireless LAN standard following 802.11ac and 802.11ad, the IEEE 802.11ax (High-Efficiency WLAN, HEW) standard is nearing completion, designed to provide efficient and high-performance wireless LAN communication in high-density environments where access points (APs) and terminals are concentrated. In 802.11ax-based wireless LAN environments, where high-density stations and access points (APs) are present, high-frequency efficiency communication should be provided indoors / outdoors, and various technologies have been developed to achieve this.

[0007] To support new multimedia applications, such as high-definition video and real-time gaming, new wireless LAN standards are being developed to increase maximum transmission rates. IEEE 802.11be (Extreme High Throughput, EHT), the 7th generation wireless LAN standard, is under development with the aim of supporting transmission rates up to 30Gbps in the 2.4 / 5 / 6GHz band through wider bandwidth, increased spatial streaming, and multi-AP collaboration. Summary of the Invention

[0008] Technical issues

[0009] As described above, one object of the present invention is to provide ultra-high-speed wireless LAN services for new multimedia applications.

[0010] Furthermore, another object of the present invention is to provide a method and apparatus for transmitting information for receiving PPDU.

[0011] Furthermore, another object of the present invention is to provide a method for individually encoding / decoding a resource unit (RU) allocation subfield, the resource unit (RU) allocation subfield indicating the resource unit for transmitting a PPDU.

[0012] The technical problems to be solved in this specification are not limited to those mentioned above, and other technical problems not mentioned can be clearly understood by those skilled in the art based on the following description.

[0013] Technical solution

[0014] A terminal for transmitting response frames (i.e., trigger-based physical layer protocol data units (TB PPDUs)) in a wireless communication system based on trigger frames includes: a communication module; and a processor for controlling the communication module, wherein the processor: receives EHT physical layer protocol data units (PPDUs) from an access point (AP) including one or more Very High Throughput (EHT)-Signaling (SIG) content channels, wherein each of the one or more EHT-SIG content channels includes a common field and a user-specific field, the common field including at least one first resource element (RU) allocation subfield; identifies whether the common field also includes at least one second RU allocation subfield; and decodes the PPDU based on whether the common field also includes at least one second RU allocation subfield.

[0015] Furthermore, in this invention, when the public field also includes at least one second RU allocation subfield, at least one first RU allocation subfield and at least one second RU allocation subfield are decoded separately.

[0016] Furthermore, in this invention, when the common field also includes the at least one second RU allocation subfield, each of the one or more EHT-SIG content channels also includes a first cyclic redundancy check (CRC) and a first tail associated with the at least one first RU allocation subfield, and when the common field also includes the at least one second RU allocation subfield, the first CRC and the first tail are located before the at least one second RU allocation subfield, and each of the one or more EHT-SIG content channels also includes a second CRC and a second tail associated with the at least one second RU allocation subfield.

[0017] Furthermore, in this invention, each of the one or more EHT-SIG content channels is identified as including the at least one second RU allocation subfield based on a specific subfield located before the at least one first RU allocation subfield.

[0018] Furthermore, in this invention, a specific subfield, the at least one first RU allocation subfield, the first CRC, and the first tail constitute a first coding block, and the at least one second RU allocation subfield, the second CRC, and the second tail constitute a second coding block.

[0019] Furthermore, in this invention, the first coding block and the second coding block are decoded separately.

[0020] Furthermore, in this invention, the one or more EHT-SIG content channels are transmitted for each predetermined bandwidth according to the bandwidth of the PPDU, and the specific subfield is set to the same value for each of the one or more EHT-SIG content channels.

[0021] Furthermore, in this invention, the specific subfield is used to identify the total number of each of the at least one first RU allocation subfield and the at least one second RU allocation subfield.

[0022] Furthermore, the present invention provides a method comprising the steps of: receiving from an access point (AP) an EHT physical layer protocol data unit (PPDU) comprising one or more Very High Throughput (EHT)-Signaling (SIG) content channels, wherein each of the one or more EHT-SIG content channels comprises a common field and a user-specific field, the common field comprising at least one first resource element (RU) allocation subfield; identifying whether the common field further comprises at least one second RU allocation subfield; and decoding the PPDU based on whether the common field further comprises at least one second RU allocation subfield.

[0023] Beneficial effects

[0024] According to embodiments of the present invention, ultra-high-speed signaling field information can be transmitted efficiently using signaling.

[0025] Furthermore, according to embodiments of the present invention, the overall resource utilization in a contention-based channel access system can be increased, and the performance of a wireless LAN system can be improved.

[0026] Furthermore, according to embodiments of the present invention, a PPDU can be received and decoded based on information included in the PPDU for transmitting and receiving the PPDU.

[0027] Furthermore, according to embodiments of the present invention, the packet structure of the PPDU can be configured efficiently by separately encoding / decoding the RU allocation subfield indicating the RU for PPDU transmission.

[0028] The effects that can be obtained in this invention are not limited to those described above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description. Attached Figure Description

[0029] Figure 1 The illustration shows a wireless LAN system according to an embodiment of the present invention.

[0030] Figure 2 The illustration shows a wireless LAN system according to another embodiment of the present invention.

[0031] Figure 3 The illustration shows the configuration of a station according to an embodiment of the present invention.

[0032] Figure 4 The diagram illustrates the configuration of an access point according to an embodiment of the present invention.

[0033] Figure 5 This diagram illustrates the process of setting up a link between a STA and an AP.

[0034] Figure 6 The diagram illustrates the Carrier Sense Multiple Access (CSMA) / Collision Avoidance (CA) method used in wireless LAN communication.

[0035] Figure 7 The illustration shows an example of a PLCP Protocol Data Unit (PPDU) format according to various standard generations.

[0036] Figure 8 Examples of various Extremely High Throughput (EHT) PPDU formats and methods for indicating them are illustrated according to embodiments of the present invention.

[0037] Figure 9 The illustration shows an example of the EHT PPDU format according to an embodiment of the present invention.

[0038] Figure 10 The diagram illustrates a preamble structure according to an embodiment of the present invention.

[0039] Figure 11 The illustration shows the configuration of the EHT-SIG field according to an embodiment of the present invention.

[0040] Figure 12a and Figure 12b The illustration shows an example of a RU allocation subfield according to an embodiment of the present invention.

[0041] Figure 13a and Figure 13b The illustration shows another example of the RU allocation subfield according to an embodiment of the present invention.

[0042] Figure 14 The illustration shows an example of the structure of EHT-SIG according to an embodiment of the present invention.

[0043] Figure 15 The illustration shows another example of the EHT-SIG structure according to an embodiment of the present invention.

[0044] Figure 16 The illustration shows an example of an EHT-SIG structure when the bandwidth of the PPDU is 20MHz or 40MHz according to an embodiment of the present invention.

[0045] Figure 17 This is a diagram illustrating the EHT-SIG structure of an 80MHz PPDU according to an embodiment of the present invention.

[0046] Figure 18 The illustration shows an example of center 26-tone RU signaling according to an embodiment of the present invention.

[0047] Figure 19 The illustration shows another example of the central 26-tone RU signaling according to an embodiment of the present invention.

[0048] Figure 20 The illustration shows another example of the central 26-tone RU signaling according to an embodiment of the present invention.

[0049] Figure 21 The illustration shows another example of the EHT-SIG structure according to an embodiment of the present invention.

[0050] Figure 22 This is a flowchart illustrating an example of a PPDU receiving and decoding method according to an embodiment of the present invention.

[0051] Figure 23 This is a flowchart illustrating a method for generating and sending PPDU according to an embodiment of the present invention. Specific Implementation

[0052] In consideration of the functionality of this invention, the terminology used in this specification employs currently widely used and common terms; however, the terminology may change according to the intent, habits, and emergence of new technologies of those skilled in the art. Furthermore, in certain cases, there are terms arbitrarily chosen by the applicant, and in such cases, their meaning will be described in the corresponding descriptive section of the invention. Therefore, it should be understood that the terminology used in this specification should be analyzed not only based on the name of the term, but also on its substantive meaning and the content of the entire specification.

[0053] Throughout this specification and the following claims, when an element is described as being “coupled” to another element, that element may be “directly coupled” to the other element or “electrically coupled” to the other element via a third element. Furthermore, unless expressly stated otherwise, the word “comprising” will be understood to implicitly include the stated element but does not exclude any other element. Additionally, limitations based on specific thresholds, such as “or more” or “or less”, may be appropriately replaced by “greater than” or “less than”, respectively.

[0054] In this invention, fields and subfields can be used interchangeably.

[0055] Figure 1 The illustration shows a wireless LAN system according to an embodiment of the present invention.

[0056] Figure 1 This diagram illustrates 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 a BSS represents a set of devices that have successfully synchronized with each other to communicate. Typically, a BSS can be divided into a Infrastructure BSS and a Standalone BSS (IBSS). Figure 1 The diagram shows the basic structure BSS between them.

[0057] 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.

[0058] A station (STA) is a predetermined device comprising a Media Access Control (MAC) conforming to the IEEE 802.11 standard and a physical layer interface for wireless media, and broadly includes both non-access point (non-AP) stations and access point (AP) stations. Furthermore, in this specification, the term "terminal" may be used to refer to a non-AP STA, or an AP, or both. A station for wireless communication includes a processor and a communication unit, and according to embodiments, may further include a user interface unit and a display unit. The processor can generate frames to be transmitted via a wireless network, or process frames to be received via a wireless network, and further performs various processes for controlling the station. Additionally, the communication unit is functionally connected to the processor and transmits and receives frames via the wireless network for the station. According to the invention, "terminal" can be used as a term including user equipment (UE).

[0059] An access point (AP) is an entity that provides access to a distributed system (DS) via wireless media used by its associated stations. In an infrastructure BSS, communication between non-AP stations is generally performed via the AP, but direct communication between non-AP stations is even permitted when a direct link is configured. In this invention, the AP is used as a concept encompassing a Personal BSS Coordination Point (PCP), and broadly can include concepts including a central controller, base station (BS), node B, base transceiver system (BTS), and site controller. In this invention, an AP can also be referred to as a base station wireless communication terminal. The term base station wireless communication terminal can be used broadly to include the terms AP, base station, eNB (i.e., e-node B), and transport point (TP). Furthermore, a base station wireless communication terminal can include various types of wireless communication terminals that allocate media resources and perform scheduling of communication with multiple wireless communication terminals.

[0060] Multiple infrastructure BSSs can be interconnected via a distributed system (DS). In this case, multiple BSSs connected via a distributed system are called an extended service set (ESS).

[0061] Figure 2 The illustration shows a standalone BSS according to another embodiment of the present invention, which is a wireless LAN system. Figure 2 In the embodiments, with Figure 1 Same or corresponding Figure 1 Repeated descriptions of certain embodiments will be omitted.

[0062] Because in Figure 2 The BSS3 shown in the diagram is an independent BSS and does not include the AP. All stations STA6 and STA7 are not connected to the AP. Independent BSSs are not allowed to access distributed systems and form self-contained networks. Within an independent BSS, the corresponding stations STA6 and STA7 can be directly interconnected.

[0063] Figure 3 This is a block diagram illustrating the configuration of station 100 according to an embodiment of the present invention. (As shown in...) Figure 3 As shown in the figure, 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.

[0064] First, the communication unit 120 transmits and receives wireless signals, such as wireless LAN packets, and can be embedded in the station 100 or provided as a peripheral. According to embodiments, 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 2.4 GHz, 5 GHz, 6 GHz, and 60 GHz). According to embodiments, the station 100 may include communication modules using frequency bands of 7.125 GHz or higher, and communication modules using frequency bands of 7.125 GHz or lower. Each communication module can perform wireless communication with an AP or external station according to the wireless LAN standard of the frequency band supported by the respective communication module. The communication unit 120 may operate one communication module at a time, or multiple communication modules simultaneously, depending on 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 a single chip. In embodiments of the invention, the communication unit 120 may represent a radio frequency (RF) communication module for processing RF signals.

[0065] Secondly, 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 using various input devices, and the processor 110 can control the station 100 based on the received user input. Furthermore, the user interface unit 140 can execute outputs based on commands from the processor 110 using various output devices.

[0066] Next, the display unit 150 outputs an image on the display screen. The display unit 150 can output various display objects based on control commands from the processor 110, such as content executed by the processor 110 or a user interface. Furthermore, the memory 160 stores the control program and various result data used in the station 100. The control program may include the access program required for the station 100 to connect to the AP or an external station.

[0067] The processor 110 of the present invention can execute various commands or programs and process data in the station 100. Furthermore, the processor 110 can control various units of the station 100 and control data transmission / reception within 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 communication configuration messages sent by the AP. Furthermore, the processor 110 can read information about the priority conditions of the station 100 included in the communication configuration messages and request access to the AP based on the information about the priority conditions 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 (e.g., communication unit 120, etc.). That is, the processor 110 can be a modem or modulator / demodulator for modulating wireless signals transmitted to the communication unit 120 and demodulating wireless signals 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. Detailed embodiments thereof will be described below.

[0068] exist Figure 3 The station 100 illustrated in the diagram is a block diagram according to an embodiment of the present invention, where the separate blocks are illustrated as logically distinct device elements. Therefore, the device elements can be installed on a single chip or multiple chips depending on the device design. For example, the processor 110 and the communication unit 120 can be implemented as a single chip or as separate chips. Furthermore, in embodiments of the present invention, certain components of the station 100, such as the user interface unit 140 and the display unit 150, may be selectively provided in the station 100.

[0069] Figure 4 This is a block diagram illustrating the configuration of AP 200 according to an embodiment of the present invention. (As shown in...) Figure 4 As illustrated in the figure, 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 In the AP200 components, and... Figure 2 The components of station 100 are the same or correspond to Figure 2 Repeated descriptions of parts of station 100 will be omitted.

[0070] refer to Figure 4 The AP 200 according to the invention includes a communication unit 220 that operates a BSS in at least one frequency band. (As in...) Figure 3As described in the embodiments, the communication unit 220 of AP 200 may also include multiple communication modules using different frequency bands. That is, AP 200 according to embodiments of the present invention may together include two or more communication modules in different frequency bands (e.g., 2.4 GHz, 5 GHz, 6 GHz, and 60 GHz). Preferably, AP 200 may include communication modules using frequency bands of 7.125 GHz or higher, and communication modules using frequency bands of 7.125 GHz or lower. Each communication module may perform wireless communication with the station according to the wireless LAN standard of the frequency band supported by the respective communication module. Communication unit 220 may operate only one communication module at a time, or operate multiple communication modules simultaneously, depending on the performance and requirements of AP 200. In embodiments of the present invention, communication unit 220 may represent a radio frequency (RF) communication module for processing RF signals.

[0071] Next, memory 260 stores the control program and various result data used in AP 200. The control program may include an access program for managing station access. Furthermore, processor 210 can control the various units of AP 200 and control data transmission / reception within the units. According to an embodiment of the invention, processor 210 can execute the program for access stations stored in memory 260 and send communication configuration messages for one or more stations. In this case, the communication configuration message may include information about access priority conditions for each station. Furthermore, processor 210 performs access configuration according to the access request of a station. According to an embodiment, processor 210 may be a modem or modulator / demodulator for modulating wireless signals transmitted to communication unit 220 and demodulating wireless signals received from communication unit 220. Processor 210 controls various operations, such as wireless signal transmission / reception of AP 200, according to embodiments of the invention. Detailed embodiments thereof will be described below.

[0072] Figure 5 This is a diagram illustrating the process of setting up a link between a STA and an AP.

[0073] refer to Figure 5 In a broad sense, the link between STA 100 and AP 200 is set up through three steps: scanning, authentication, and association. First, the scanning step is where STA 100 obtains access information from the BSS operated by AP 200. Methods for performing the scan include a passive scanning method, in which AP 200 obtains information by periodically sending beacon messages (S101), and an active scanning method, in which STA 100 sends a probe request to AP (S103) and obtains access information by receiving a probe response from AP (S105).

[0074] STA 100, having successfully received wireless access information during the scanning step, performs an authentication step by sending an authentication request (S107a) and receiving an authentication response from AP 200 (S107b). After performing the authentication step, STA 100 performs an association step by sending an association request (S109a) and receiving an association response from AP 200 (S109b). In this specification, association primarily refers to wireless association; however, the invention is not limited thereto, and association can broadly include both wireless and wired associations.

[0075] Meanwhile, the 802.1X-based authentication step (S111) and the IP address acquisition step via DHCP (S113) can be performed separately. Figure 5 In this context, authentication server 300 is the server that handles 802.1X-based authentication for STA 100, and can exist in a physical association with AP200 or as a standalone server.

[0076] Figure 6 This is a diagram illustrating the Carrier Sensing Multiple Access (CSMA) / Collision Avoidance (CA) method used in wireless LAN communication.

[0077] Terminals performing wireless LAN communication check channel busy by performing carrier sensing before transmitting data. When a wireless signal of predetermined strength or greater is sensed, the corresponding channel is determined to be busy, and the terminal delays access to that channel. This process is called Clear Channel Assessment (CCA), and the level at which a corresponding signal is sensed is called the CCA threshold. When a terminal receives a wireless signal with a CCA threshold or higher that indicates it is a receiver, the terminal processes the received wireless signal. Conversely, when no wireless signal is detected in the corresponding channel, or a wireless signal with a strength less than the CCA threshold is detected, the channel is determined to be idle.

[0078] When the channel is determined to be idle, each terminal with data to transmit performs a backoff procedure after an inter-frame interval (IFS) period, the duration of which depends on the specific terminal, such as 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). During the idle period of the channel, each terminal waits while decreasing the slot time by a time slot equal to the random number determined by the corresponding terminal, and the terminal that has completely exhausted the slot time attempts to access the corresponding channel. Thus, the interval during which each terminal performs the backoff procedure is called the contention window interval. The random number can be referred to as a backoff counter. That is, the initial value of the backoff counter can be set as an integer of the random number obtained by the terminal. If the terminal detects that the channel is idle during the slot time, the terminal can decrement the backoff counter by 1. Furthermore, if the backoff counter reaches 0, the terminal can be allowed to perform channel access in the corresponding channel. Therefore, if the channel is idle during the AIFS time and the slot time of the backoff counter, the terminal can be allowed to transmit.

[0079] When a specific terminal successfully accesses the channel, it can transmit data through the channel. However, when a terminal attempting to access the channel conflicts with another terminal, the conflicting terminals are each assigned a new random number to re-execute the backoff process. According to an embodiment, a new random number assigned to each terminal can be determined within a range (2*CW), which is twice the range of the previously assigned random numbers (contention window CW) to the corresponding terminal. Simultaneously, each terminal attempts to access the channel again by re-executing the backoff process in the next contention window interval, and in this case, each terminal begins the backoff process from the remaining time slot of the previous contention window interval. In this way, terminals performing wireless LAN communication can avoid mutual conflicts on a specific channel.

[0080] <Examples of various PPDU formats>

[0081] Figure 7 The illustration shows examples of PLCP Protocol Data Unit (PPDU) formats according to various standard generations. More specifically, Figure 7 (a) shows an example based on the traditional PPDU format of 802.11a / g. Figure 7 (b) shows an example of the HE PPDU format based on 802.11ax, and Figure 7 (c) shows an example of a non-traditional PPDU (i.e., EHT PPDU) format based on 802.11be. Furthermore, Figure 7 (d) shows the detailed field configuration of L-SIG and RL-SIG, which are used in common in the PPDU format.

[0082] Reference Figure 7 (a) The preamble of a conventional PPDU includes a conventional short training field (L-STF), a conventional long training field (L-LTF), and a conventional signal field (L-SIG). In embodiments of the present invention, L-STF, L-LTF, and L-SIG may be referred to as conventional preambles.

[0083] Reference Figure 7 (b) The HE PPDU preamble additionally includes, in addition to the conventional preamble, a repeated conventional short training field (RL-SIG), an efficient signal A field (HE-SIG-A), an efficient signal B field (HE-SIG-B), an efficient short training field (HE-STF), and an efficient long training field (HE-LTF). In embodiments of the present invention, the aforementioned RL-SIG, HE-SIG-A, HE-SIG-B, HE-STF, and HE-LTF may be referred to as HE preambles. The specific configuration of the HE preamble can be changed according to the HE PPDU format. For example, HE-SIG-B may only be used in the HE MU PPDU format.

[0084] Reference Figure 7 (c) The EHT PPDU preamble additionally includes, within the conventional preamble, a repeated conventional short training field (RL-SIG), a universal signal field (U-SIG), an ultra-high throughput signal A field (EHT-SIG-A), an ultra-high throughput signal B field (EHT-SIG-B), an ultra-high throughput short training field (EHT-STF), and an ultra-high throughput long training field (EHT-LTF). In embodiments of the invention, the aforementioned RL-SIG, EHT-SIG-A, EHT-SIG-B, EHT-STF, and EHT-LTF may be referred to as EHT preambles. The specific configuration of non-conventional preambles can be varied depending on the EHT PPDU format. For example, EHT-SIG-A and EHT-SIG-B may be used only in certain portions of the EHT PPDU format.

[0085] The L-SIG field included in the PPDU preamble uses 64FFT OFDM and comprises a total of 64 subcarriers. Of these, 48 subcarriers, excluding the guard subcarrier, DC subcarrier, and pilot subcarrier, are used for L-SIG data transmission. Since L-SIG uses BPSK and a rate-1 / 2 modulation and coding scheme (MCS), it can include a total of 24 bits of information. Figure 7 (d) shows the 24-bit information configuration of L-SIG.

[0086] Reference Figure 7(d) L-SIG includes the L_RATE and L_LENGTH fields. The L_RATE field consists of 4 bits and represents the MCS used for data transmission. Specifically, the L_RATE field represents a value of one of the following: a transmission rate of 6 / 9 / 12 / 18 / 24 / 36 / 48 / 54 Mbps, achieved by combining modulation schemes such as BPSK / QPSK / 16-QAM / 64QAM and code rates of 1 / 2, 2 / 3, and 3 / 4. By combining the information from the L_RATE and L_LENGTH fields, the total length of the corresponding PPDU can be represented. In non-traditional PPDU formats, the L_RATE field is set to the minimum speed of 6 Mbps.

[0087] The L_LENGTH field can be allocated a total of 12 bits per byte, can be transmitted via signaling up to 4095, and can indicate the length of the corresponding PPDU by combining it with the L_RATE field. In this case, traditional and non-traditional terminals can use different methods to interpret the L_LENGTH field.

[0088] First, the method for analyzing the length of the corresponding PPDU using the L_LENGTH field in traditional or non-traditional terminals is as follows. When the value of the L_RATE field is set to indicate 6 Mbps, 3 bytes (i.e., 24 bits) can be transmitted during the 4 μs duration of one symbol in a 64FFT. Therefore, the 3 bytes corresponding to the SVC field and the tail field are added to the value of the L_LENGTH field, and the sum is divided by the 3 bytes of transmission as one symbol to obtain the number of symbols based on 64FFT after L-SIG. Multiplying the obtained number of symbols by 4 μs (i.e., the length of one symbol), and then adding the transmission time of L-STF, L-LTF, and L-SIG (20 μs), the length of the corresponding PPDU, i.e., the reception time RXTIME, is obtained. This can be represented by Equation 1 below.

[0089] [Equation 1]

[0090]

[0091] at this time, This 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 a maximum of 5.484 ms. Non-traditional terminals used to send the corresponding PPDU should set the L_LENGTH field to the following equation 2.

[0092] [Equation 2]

[0093]

[0094] Here, TXTIME is the total transmission time configured for the corresponding PPDU, as shown in Equation 3 below. In this case, TX represents the transmission time of X.

[0095] [Equation 3]

[0096] 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

[0097] Referring to the equation above, the length of the PPDU is calculated based on the floor value of L_LENGTH / 3. Therefore, for any value of k, three different values ​​L_LENGTH = {3k+1, 3k+2, 3(k+1)} indicate the same PPDU length.

[0098] Reference Figure 7 (e) The U-SIG (Universal SIG) field continues to exist in EHT PPDUs and next-generation wireless LAN PPDUs, and is used to distinguish which generation of PPDU (including 11be). U-SIG is based on two OFDM symbols of 64FFT and can transmit a total of 52 bits of information. Of these, excluding the 9 bits of CRC / tail, the remaining 43 bits are roughly divided into a version-independent (VI) field and a version-dependent (VD) field.

[0099] The VI bit ensures that the current bit configuration remains consistent in the future, allowing current 11be terminals to obtain information about the corresponding PPDU through its VI field even if a next-generation PPDU is defined. For this purpose, the VI field consists of a PHY version field, a UL / DL field, a BSS color field, a TXOP field, and a reserved field. The PHY version field has 3 bits and distinguishes between 11be and subsequent generations of wireless LAN standards, sequentially. In the case of 11be, the value is 000b. The UL / DL field distinguishes whether the corresponding PPDU is an uplink / downlink PPDU. The BSS color represents the identifier of each BSS defined in 11ax and has a value of 6 bits or more. The TXOP represents the transmission opportunity duration transmitted in the MAC header; by adding it to the PHY header, the length of the TXOP including the corresponding PPDU can be inferred without decoding the MPDU, and it has a value of 7 bits or more.

[0100] The VD field is signaling information useful only for PPDUs of version 11be, and can consist of fields common to all PPDU formats, such as BW, and fields defined differently depending on the PPDU format. The PPDU format is an identifier used to distinguish EHT Single User (SU), EHT Multi-User (MU), Triggered EHT (TB), EHT Extended Range (ER) PPDUs, etc. The BW field can transmit approximately five basic PPDU BW options at 20, 40, 80, 160 (80+80), and 320 (160+160) MHz (BWs that can be represented by powers of 20 are called basic BWs), as well as various other PPDU BWs configured via preamble piercing. Furthermore, after signaling transmission at 320 MHz, it can be transmitted in a partially pierced 80 MHz format. Furthermore, the punctured and deformed channel format can be transmitted directly in the BW field using signaling, or it can be transmitted together with the BW field and fields appearing after the BW field (e.g., fields in the EHT-SIG field). If the BW field is set to 3 bits, a total of 8 BW signaling messages can be executed; therefore, in punctured mode, a maximum of only 3 BW signaling messages can be executed. If the BW field is set to 4 bits, a total of 16 BW signaling messages can be executed, allowing a maximum of 11 BW signaling messages to be executed in punctured mode.

[0101] The fields following the BW field vary depending on the PPDU's form and format. MU PPDUs and SU PPDUs can be transmitted using signaling in the same PPDU format. The field used to distinguish between MU PPDUs and SU PPDUs can be located before the EHT-SIG field, and additional signaling transmission can be performed for that field. Both SU PPDUs and MU PPDUs include the EHT-SIG field, but some unnecessary fields in the SU PPDU can be compressed. In this case, the information of the compressed fields can be omitted or reduced in size compared to the original fields included in the MU PPDU. For example, in the case of SU PPDUs, different configurations are possible such as: common fields of EHT-SIG can be omitted or replaced, user-specific fields can be replaced, or they can be reduced to one, etc.

[0102] Alternatively, the SU PPDU may also include a compression field indicating whether compression is performed, and some fields (e.g., the RA field) may be omitted depending on the value of the compression field.

[0103] If a portion of the EHT-SIG field of a SU PPDU is compressed, the information included in the compressed field can be transmitted together with the uncompressed field (e.g., the common field) using signaling. In the case of a MU PPDU, since it is a PPDU format for simultaneous reception by multiple users, the EHT-SIG field must be sent after the U-SIG field, and the amount of information transmitted via signaling can be variable. That is, since multiple MU PPDUs are sent to multiple STAs, each STA needs to identify the location of the RU that sent the MU PPDU, the STA assigned to each RU, and whether the sent MU PPDU was sent to itself. Therefore, the AP needs to include the above information in the EHT-SIG field for transmission. For this purpose, the U-SIG field uses signaling to transmit information for efficient transmission of the EHT-SIG field, which can be the symbol number of the EHT-SIG field and / or the MCS as a modulation method. The EHT-SIG field can include the size and location information of the RU assigned to each user.

[0104] In the case of SU PPDU, multiple RUs can be assigned to STA, and these RUs can be contiguous or discontinuous. If the RUs assigned to the STA are not contiguous, the STA needs to identify the RUs that are punctured in the middle in order to efficiently receive the SU PPDU. Therefore, the AP can include information about the punctured RUs among the RUs assigned to the STA (e.g., the RU puncture pattern, etc.) in the SU PPDU for transmission. That is, in the case of SU PPDU, the EHT-SIG field can include a puncture mode field containing information indicating whether a puncture mode is applied and representing the puncture pattern in bitmap format, and the puncture mode field can be used to transmit the form of discontinuous channels appearing in the bandwidth using signaling.

[0105] The form of discontinuous channels transmitted via signaling is restricted and combined with the value of the BW field to indicate the BW and discontinuous channel information of the SUPPDU. For example, in the case of a SU PPDU, since it is a PPDU sent only to a single terminal, the STA can identify the bandwidth allocated to it by the BW field included in the PPDU, and can identify the punctured resources in the allocated bandwidth by the puncturing mode field of the U-SIG field or EHT-SIG field included in the PPDU. In this case, the terminal can receive the PPDU in the remaining resource units other than the specific channel of the punctured resource unit. At this time, multiple RUs allocated to the STA can be configured for different frequency bands or tones.

[0106] The reason for using only signaling to transmit the discontinuous channel configuration in a restricted manner is to reduce the signaling overhead of the SU PPDU. Since puncturing can be performed on every 20MHz subchannel, if puncturing is performed on a BW (e.g., 80, 160, and 320MHz) with multiple 20MHz subchannels, in the case of 320MHz, it would be necessary to separately indicate whether the remaining 15 20MHz subchannels (excluding the main channel) are used, and to transmit the discontinuous channel configuration (the configuration where only the edge 20MHz is punctured is also considered discontinuous) using signaling. Thus, considering the low transmission rate of the signaling section, sacrificing 15 bits to transmit the discontinuous channel configuration for single-user transmission using signaling could become excessive signaling overhead.

[0107] Furthermore, in embodiments of the present invention, a technique is proposed to modify the configuration of the PPDU indicated by the preamble piercing (BW) value based on the PPDU format transmitted via signaling in the PPDU format field. Assuming the BW field length is 4 bits, and in the case of EHT SU PPDU or TB PPDU, a symbol of EHT-SIG-A can be additionally transmitted via signaling after U-SIG, or EHT-SIG-A can be transmitted without signaling at all. Therefore, considering this, it is necessary to transmit up to 11 piercing patterns completely via signaling only through the BW field of U-SIG. However, in the case of EHT MU PPDU, since EHT-SIG-B is additionally transmitted via signaling after U-SIG, up to 11 piercing patterns can be transmitted via signaling in a different manner than SU PPDU. In the case of EHT ER PPDU, whether the PPDU uses a 20MHz or 10MHz frequency band can be transmitted via signaling by setting the BW field to 1 bit.

[0108] Figure 7 (f) illustrates the configuration of the format-specific fields of the VD field when indicated as an EHT MU PPDU in the PPDU format field of U-SIG. In the case of a MU PPDU, a signaling field SIG-B is required for simultaneous reception by multiple users, and SIG-B can be sent after U-SIG without an additional SIG-A. For this purpose, U-SIG needs to transmit signaling information for decoding SIG-B. These fields include the SIG-B MCS field, SIG-B DCM field, SIG-B symbolic number field, SIG-B compression field, and EHT-LTF symbolic number field, etc.

[0109] Figure 8 Examples of various EHT PPDU formats and methods for indicating them are illustrated according to embodiments of the present invention.

[0110] Reference Figure 8 A PPDU can consist of a preamble and a data portion, and the format of a type of EHT PPDU can be distinguished based on the U-SIG field included in the preamble. Specifically, whether a PPDU is an EHT PPDU can be indicated based on the PPDU format field included in the U-SIG field.

[0111] Figure 8 (a) shows an example of the EHT SU PPDU format for a single STA. The EHT SU PPDU is a PPDU used for single-user (SU) transmissions between an AP and a single STA, and the EHT-SIG-A field for additional signaling can be located after the U-SIG field.

[0112] Figure 8 (b) shows an example of an EHT trigger-based PPDU format as an EHT PPDU transmitted based on a trigger frame. An EHT trigger-based PPDU is an EHT PPDU transmitted based on a trigger frame and is an uplink PPDU used to respond to a trigger frame. Unlike the EHT SU PPDU, the EHT PPDU does not have an EHT-SIG-A field after the U-SIG field.

[0113] Figure 8 (c) shows an example of the EHT MU PPDU format as an EHT PPDU for multiple users. An EHT MU PPDU is a PPDU used to send a PPDU to one or more STAs. In the EHT MU PPDU format, an HE-SIG-B field may exist after the U-SIG field.

[0114] Figure 8 (d) shows an example of an EHT ERSU PPDU format used for transmission with a single user located in an extended range STA. EHT ERSU PPDU can be used with... Figure 8 The EHT SU PPDU described in (a) provides a wider range of single-user transmissions for STAs, and the U-SIG field can be repeatedly positioned on the timeline.

[0115] exist Figure 8The EHT MU PPDU described in (c) can be used for downlink transmission from an AP to multiple STAs. In this case, the EHT MU PPDU may include scheduling information that allows multiple STAs to simultaneously receive PPDUs sent from the AP. The EHT MU PPDU may send the receiver's and / or sender's AID information of the PPDU sent via the user-specific field of EHT-SIG-B to the STA. Therefore, multiple terminals that have received the EHT MU PPDU can perform spatial reuse operations based on the AID information included in the user-specific field in the preamble of the received PPDU.

[0116] Specifically, the Resource Unit Allocation (RA) field of the HE-SIG-B field included in the HE MU PPDU can include information about the configuration (e.g., the allocation form of resource units) of resource units in a specific bandwidth (e.g., 20 MHz) on the frequency axis. That is, the RA field can indicate the configuration of resource units allocated in the bandwidth used to transmit the HE MU PPDU, enabling the STA to receive the PPDU. Information about the STA allocated (or specified) to each allocated resource unit can be included in the user-specific fields of the EHT-SIG-B and sent to the STA. That is, the user-specific fields can include one or more user fields corresponding to each allocated resource unit.

[0117] For example, the user field corresponding to at least one resource unit in a plurality of partitioned resource units used for data transmission may include the AID of the receiver or sender, and the user field corresponding to the remaining resource units not performed in data transmission may include a preset empty STAID.

[0118] Figure 8 Two or more PPDUs shown can be indicated by values ​​representing the same PPDU format. That is, two or more PPDUs can be indicated by the same value in the same PPDU format. For example, an EHT SU PPDU and an EHT MU PPDU can be indicated by the same value in the U-SIG PPDU format subfield. In this case, the EHT SU PPDU and EHT MU PPDU can be distinguished by the number of STAs receiving the PPDU. For example, a PPDU received by only one STA can be identified as an EHT SU PPDU, and when the number of STAs is set to be received by two or more STAs, it can be identified as an EHT MU PPDU. In other words, they can be indicated by the same subfield value. Figure 8 The two or more PPDU formats shown.

[0119] In addition, it can be omitted Figure 8The partial fields or partial information of the fields shown in the document can be defined as compressed mode or compressed mode, and the case where partial fields or partial information of the fields are omitted can be defined as compressed mode or compressed mode.

[0120] Figure 9 The illustration shows an example of the EHT PPDU format according to an embodiment of the present invention.

[0121] Reference Figure 9 An EHT PPDU may include one or more signaling fields (SIG fields). Specifically, see reference [link to relevant documentation]. Figure 7 and Figure 8 The EHT PPDU may include an L-SIG field, a U-SIG field, and an EHT-SIG field, and the EHT-SIG field may include an EHT-SIG-A field and / or an EHT-SIG-B field.

[0122] An EHT PPDU can consist of a preamble and data, and the preamble can include at least one of L-STF, L-LTF, L-SIG, RL-SIG, U-SIG, EHT-SIG, EHT-STF, and EHT-LTF. Therefore, the EHT preamble can be used to indicate one or more of the aforementioned fields. The position and order of the fields included in the preamble can be consistent with... Figure 9 And the positions and order of the fields mentioned above are the same.

[0123] L-STF, L-LTF, and L-SIG can be fields for legacy compatibility, and RL-SIG and L-SIG can include the same information. That is, some or all of the bit values ​​of L-SIG can be repeatedly set in RL-SIG, and RL-SIG can be used to distinguish the format of the PPDU.

[0124] EHT-SIG can include common fields and user-specific fields, and can include resource allocation information for PPDU transmission, STA information for identifying STAs that have been allocated resources, etc. Therefore, a STA receiving a PPDU can determine (or identify) whether it has been allocated resources based on EHT-SIG, and determine how the resources are allocated (such as the location and size of the allocated resources).

[0125] Public fields may include resource unit allocation information about resource units (RUs) allocated to at least one STA. For example, RU allocation information may include information about the size, location, configuration, and number of STAs to which RUs are allocated.

[0126] User-specific fields may include information about the STA decoding payload used to receive the PPDU (e.g., information about each STA), and may include information about one or more STAs. Specifically, user-specific fields may include information about the STAs assigned to the RU (e.g., STA identifier (ID), etc.) in a separate field corresponding to each STA. That is, information corresponding to STA 1 (User 1), information corresponding to STA 2 (User 2), information corresponding to STA 3 (User 3), ..., information corresponding to STA N (User N) may be included consecutively in user-specific fields. In this case, information about each STA may be included in user fields, and user fields including information about each STA may be included consecutively in user-specific fields.

[0127] A STA receiving a PPDU can determine whether it has been assigned a RU for receiving the PPDU based on whether its own STA ID is included in the STA ID field of the user-specific field. That is, a STA can determine whether it has been assigned a RU by determining whether the STA ID corresponding to the RU assigned through the RU allocation subfield is its own ID, and can receive the PPDU through the RU assigned to it.

[0128] Furthermore, the information about the STA included in the user field may include information about the number of space-time streams (NSTS), information about whether a beamforming steering matrix is ​​applied, information about the modulation and coding scheme (MCS), information about whether dual-carrier modulation (DCM) is used, and information about the coding method (e.g., which coding method is used, such as BCC or LDPC). Additionally, this information may be applicable to the corresponding STA-ID value.

[0129] If the common fields indicate the structure of the RUs allocated to each STA and the number of STAs allocated to each RU, then the user fields included in the user-specific fields can be mapped to the RUs indicated by the common fields in the order they are located. For example, based on the RU allocation subfield of the common fields, RU1 can be allocated to one STA, RU2 can be allocated to two STAs, and RU3 can be allocated to one STA, and the user-specific fields can include four user fields in sequence (user field 1, user field 2, user field 3, and user field 4). In this case, RU1 can be allocated to the STA corresponding to the STA ID included in user field 1, and RU2 can be allocated to the STA corresponding to the STA IDs included in user fields 2 and 3. Similarly, RU3 can be allocated to the STA corresponding to the STA ID included in user field 4. If, as with RU2, two or more STAs are allocated to one RU, then MIMO can be used.

[0130] like Figure 9 As shown, public fields and user-specific fields can be included in EHT-SIG in sequence.

[0131] In this invention, fields and subfields can be used interchangeably, and are not limited to their names.

[0132] EHT PPDU may also include a location indicator subfield, in which case, such as Figure 9 As shown, the location indicator subfield can be included in the common fields of EHT-SIG. The location indicator subfield can be referred to as a header field and can be used to indicate the location and number of RU allocation subfields in the common fields.

[0133] Specifically, since the location indicator subfield can indicate the location corresponding to the RU allocation subfield, the location of the RU indicated by the user field can be determined based on the location indicator subfield in addition to the RU allocation subfield. For example, the location indicator subfield can indicate the start position of the RU indicated by the RU allocation subfield and / or the position of the last allocated RU, and can indicate the number of RU allocation subfields. In this case, the RU allocation subfield represents the field included in the common fields of the EHT-SIG described above.

[0134] The position indicator subfield may include multiple bits, and each of these bits may correspond to a frequency band of a predetermined unit on the frequency axis. For example, each of the bits constituting the position indicator subfield may be mapped to a non-overlapping frequency band. That is, the bits of the position indicator subfield may be mapped to 20MHz subbands, and in this case, the bits may be mapped sequentially according to the frequency order of the 20MHz subbands. In other words, the position indicator subfield may be mapped sequentially to the bits of the position indicator subfield according to the frequency order of a frequency band of a predetermined size.

[0135] For example, each bit can be mapped sequentially in the following order: main 20MHz (P20), auxiliary 20MHz (S20), auxiliary 40MHz (S40) first 20MHz, S40 second 20MHz, auxiliary 80 (S80) first 20MHz, S80 second 20MHz, S80 third 20MHz, S80 fourth 20MHz, S160 (the frequency band other than P80 and S80 can be called S160) first 20MHz, auxiliary 160MHz (S160) second 20MHz, S160 third 20MHz, S160 fourth 20MHz, S160 fifth 20MHz, S160 sixth 20MHz, S160 seventh 20MHz, and S160 eighth 20MHz.

[0136] For example, if a specific bit constituting the position indicator subfield is 1, then the RU allocation subfield associated with the frequency band mapped to that specific bit can be included in the common field. Furthermore, if a specific bit constituting the position indicator subfield is 0, then the RU allocation subfield associated with the frequency band mapped to that specific bit may not be included in the common field. Therefore, the number of RU allocation subfields included in the common field can be determined based on the value of each bit of the position indicator subfield.

[0137] Therefore, the number of RU allocation subfields in a common field can be identified based on a specific field preceding the RU allocation subfield.

[0138] The length (or size) of the location indicator subfield can be based on the bandwidth or channel width of the PPDU. In this case, the bandwidth or channel width can be indicated by the bandwidth field included in the U-SIG field, and can represent the bandwidth or channel width occupied by the PPDU with the U-SIG field including the bandwidth field.

[0139] For example, the length of the location indicator subfield can be 4 bits, 8 bits, or 16 bits. In this case, if the bandwidth is 80MHz, 160MHz, or 320MHz, the size of the location indicator subfield can be 4, 8, or 16 bits.

[0140] Furthermore, the length of the location indicator subfield can be based on the puncturing information indicated by the U-SIG field. In this case, the puncturing information can be indicated through the bandwidth field of the U-SIG field. For example, when the bandwidth occupied by the PPDU is indicated through the bandwidth field, the puncturing information can also be indicated together. That is, when the bandwidth of the PPDU is indicated through the bandwidth field, the puncturing information indicating whether the indicated bandwidth has been punctured can be indicated together.

[0141] For example, the location indicator subfield may not include bits used to indicate the punctured channel (band) of the puncturing information, but may include bits used to indicate the unpunctured channel (band) indicated by the puncturing information. That is, the location indicator subfield may include bits associated with the unpunctured channel (band).

[0142] Furthermore, according to embodiments of the present invention, the length and value of the location indicator subfield can vary according to the frequency band. For example, the length and value of the location indicator subfield included in the PPDU of P160 can be different from the length and value of the location indicator subfield included in the PPDU of S160.

[0143] That is, depending on the bandwidth of the PPDU, the EHT-SIG field (or EHT-SIG content channel) of the PPDU can be repeatedly transmitted in the channel (e.g., 20MHz) of each bandwidth unit within the bandwidth of the PPDU. In this case, the values ​​of the fields included in the U-SIG field of the PPDU can be set to the same value for each bandwidth unit channel, and a portion of the fields included in the EHT-SIG field can be set to the same value, while the remaining fields can be set to the same value or different values ​​individually.

[0144] For example, when the PPDU bandwidth is 80MHz, the EHT-SIG field (or EHT-SIG content channel) can be transmitted a total of four times, repeated (or duplicated) in 20MHz units. In this case, some fields of the EHT-SIG field can be set to the same value in each of the four channels in 20MHz units, and the remaining fields can be set to the same or different values ​​individually. In this case, the position indicator subfield can be set to the same or different values ​​in the 20MHz channels. That is, some or all bits of the position indicator subfield can be set to the same or different values ​​between the EHT-SIG fields in each 20MHz channel. However, the length and value of the position indicator subfield transmitted in the primary 80MHz and secondary 80MHz channels can be different.

[0145] like Figure 9As shown, the public fields included in the EHT-SIG field may include a location indicator subfield, and the location indicator subfield may precede the RU allocation subfield. For example, the location indicator subfield may be included at the very beginning of the public fields.

[0146] Furthermore, the EHT-SIG of the EHT PPDU may include a RU allocation subfield. As mentioned above, the RU allocation subfield can indicate the configuration and location of the allocated RUs and the number of STAs (or users) assigned to each RU. Therefore, the number of user fields included in the user-specific fields can be determined based on the RU allocation subfield. That is, since the user fields include information about the STAs assigned to the RUs, the number of user fields included in the user-specific fields can be identified based on the number of STAs assigned to the RUs via the RU allocation subfield.

[0147] The number of RU allocation subfields included in the EHT PPDU can be determined based on specific fields. Specifically, the number of RU allocation subfields included in the EHT PPDU can be based on the position indicator subfield. For example, the number of RU allocation subfields can be based on the number of 1s in the bits of the position indicator subfield. That is, there can be N RU allocation subfields with a unit length. Furthermore, N can be based on the position indicator subfield, and in the case of compressed mode, N can be 0.

[0148] Therefore, the number and / or location of the RU allocation subfields can be identified by the location indicator subfield, and the size and value of the location indicator subfield can be identified by the bandwidth based on the bandwidth field of the U-SIG field. That is, the size and value of the location indicator subfield can be determined based on the bandwidth field of the U-SIG field, and the number and / or location of the RU allocation subfields can be identified through the location indicator subfield. Consequently, the number of RU allocation subfields can be determined through the bandwidth field of the U-SIG field.

[0149] The EHT-SIG field can include a Cyclic Redundancy Code (CRC) subfield and a tail (tail) subfield. The CRC included in the EHT-SIG field can be calculated for the position indicator subfield and the RU allocation subfield. Furthermore, the tail subfield can be used to terminate the trellis of the convolutional decoder. The tail subfield can be used to flush the convolutional decoder. The receiver or decoder may need to decode both the subfield corresponding to the CRC and the CRC simultaneously. Therefore, the subfield corresponding to the CRC must be pre-set to enable decoding.

[0150] As described above, the common fields included in the EHT-SIG field may include the location indicator subfield, the RU allocation subfield, the CRC field, and the tail field.

[0151] Figure 10 The diagram illustrates the leading structure according to an embodiment of the present invention.

[0152] According to embodiments of the present invention, the U-SIG field or the EHT-SIG field can have different values ​​depending on the unit frequency band. For example, the unit frequency band can be an 80MHz band or a 160MHz band. (See also...) Figure 10 The EHT-SIG field can vary depending on the 80MHz subband. Figure 10 In this embodiment, the PPDU has a bandwidth of 320MHz, and the 80MHz subbands 1, 2, 3, and 4 respectively include EHT-SIG 1, EHT-SIG 2, EHT-SIG 3, and EHT-SIG 4. Furthermore, the PPDU can be received even if the receiver only decodes the specific 80MHz U-SIG and EHT-SIG fields.

[0153] Furthermore, the EHT-SIG field per unit frequency band can include multiple content channels (CCs). Different content channels can mean different common field values, different RU allocation subfield values, and / or different location indicator subfield values. For example, there can be two content channels. (See reference...) Figure 10 Each EHT-SIG field in the 80MHz subband can have CC1 and CC2. That is, multiple content channels of the EHT-SIG field can include subfields with the same value between content channels and / or subfields with different values ​​between content channels.

[0154] For example, in the common fields of EHT-SIG content channels, some fields can have the same value across content channels, while other fields (e.g., RU allocation subfield, user-specific subfield, etc.) can have different values ​​across content channels. In this case, some or all of the bit values ​​of the position indicator subfield can be the same or different depending on their function. For example, when some bits of the position indicator subfield are used as the center 26-tone RU subfield, such bits can have the same value across content channels.

[0155] In this case, a specific subfield with the same value across all EHT-SIG content channels within the common fields of the EHT-SIG field can be as follows.

[0156] - Space reuse

[0157] -LDPC extra symbol segment

[0158] -GI+LTF size

[0159] -EHT-LTF symbol number

[0160] -Pre-FEC fill factor

[0161] -PE disambiguation

[0162] Figure 11 The illustration shows the configuration of the EHT-SIG field according to an embodiment of the present invention.

[0163] Figure 11 Show Figure 9 The use of the location indicator subfield and RU allocation subfield, as well as the configuration of the EHT-SIG field, shown in the diagram, can be omitted from the content described above.

[0164] As described above, each bit of the location indicator subfield can correspond to a preset frequency band. For example, each bit of the location indicator subfield can correspond to a 20MHz subband. In this case, each bit of the location indicator subfield can sequentially represent different 20MHz subbands from lower frequencies. Figure 11 An example of a 320MHz frequency band is shown. (See reference...) Figure 11 The position indicator subfield can consist of bits represented by B0 to B15. Furthermore, each bit can correspond to a 20MHz subband, and B0 to B15 can indicate a total frequency band of 320MHz.

[0165] Furthermore, the location indicator subfield can indicate the location of the RU to be signaled in the corresponding content channel. Alternatively, the location indicator subfield can indicate the location corresponding to the RU allocation subfield to be signaled in the corresponding content channel. See reference. Figure 11 The position indicator subfield of content channel 1 indicates RU1, RU3, and RU4, and the position indicator subfield of content channel 2 indicates RU2, RU5, RU6, and RU7. The position indicator subfield of content channel 1 indicates the start position of RU1, RU3, and RU4, and the position indicator subfield of content channel 2 indicates the start position of RU2, RU5, RU6, and RU7. In the position indicator subfield, a value of 1 can indicate the start of the frequency band corresponding to the RU allocation subfield transmitted via signaling. Therefore, B2 of the position indicator subfield of content channel 1 is represented as 1 to indicate the presence of the RU allocation subfield corresponding to RU3, which is a RU in the frequency band from B2 to B7. Furthermore, multiple RUs can be used for RU4. RU4 can use both the frequency band corresponding to B8 and the frequency band corresponding to B10 to B11. To indicate this, B8 of the position indicator subfield can be set to 1.

[0166] As mentioned above, the location indicator subfield can indicate the frequency band location corresponding to the RU allocation. The actual RU size can be indicated in the RU allocation subfield.

[0167] Reference Figure 11 Since the position indicator subfield of content channel 1 indicates the position and presence of RU1, RU3, and RU4, RU allocation subfields corresponding to RU1, RU3, and RU4 can exist, and the position where such RU allocation subfields exist can be content channel 1. Similarly, since the position indicator subfield of content channel 2 indicates the position and presence of RU2, RU5, RU6, and RU7, RU allocation subfields corresponding to RU2, RU5, RU6, and RU7 can exist, and the position where such RU allocation subfields exist can be content channel 2. Furthermore, RU allocation subfields can exist in the order indicated by the position indicator subfield. That is, when a position indicator subfield can indicate the presence of an RU allocation subfield, for example, when a bit value of 1 in the position indicator subfield indicates the presence of an RU allocation subfield, the bits with a value of 1 in the position indicator subfield can be mapped sequentially to the RU allocation subfields. That is, the first RU allocation subfield can correspond to the first 1 bit of the position indicator subfield, and the second RU allocation subfield can correspond to the second 1 bit of the position indicator subfield. See reference. Figure 11 In content channel 1, the RU allocation subfield corresponding to B0, which is the first 1 in the location indicator subfield, appears first; the RU allocation subfield corresponding to B2, which is the second 1 in the location indicator subfield, appears second; and the RU allocation subfield corresponding to B8, which is the third 1 in the location indicator subfield, appears third.

[0168] Therefore, the number of bits with a value of 1 in the position indicator subfield can indicate the number of RU allocation subfields. Alternatively, the number of bits with a value of 1 in the position indicator subfield can represent the number of RU allocation subfields. In this case, the length of each RU allocation subfield can be N_RA bits.

[0169] Figure 11 Content channel 1 and content channel 2 shown can be as follows: Figure 10 The shown unit frequency bands contain CC1 and CC2. Alternatively, Figure 11 Content channel 1 and content channel 2 shown can represent, for example, Figure 10 The diagram shows EHT-SIG1 and EHT-SIG2, which differ depending on the unit frequency band.

[0170] By using RU signaling based on the location indicator subfield, signaling transmission can be freely performed in any content channel. More specifically, signaling transmission can be performed for RUs in any location within any content channel.

[0171] Furthermore, a CRC and a tail may exist after the location indicator subfield and the RU allocation subfield. In this case, the CRC can correspond to both the location indicator subfield and the RU allocation subfield. That is, the location indicator subfield, the RU allocation subfield, and the CRC can be decoded together.

[0172] However, according to embodiments of the present invention, since the number of RU allocation subfields is variable and determined based on the value of the position indicator subfield, it is difficult to determine the length of the bit sequence decoded together with the CRC. That is, the lengths of the position indicator subfield and the RU allocation subfield used in the CRC calculation may be difficult to determine. Alternatively, the STA needs to decode together with the CRC to check the value of the position indicator subfield, but since the length of the RU allocation subfield used to perform the CRC calculation is unknown, it is difficult for the STA to perform the decoding.

[0173] Figure 12a and Figure 12b The illustration shows an example of a RU allocation subfield according to an embodiment of the present invention.

[0174] Figure 12a and Figure 12b It is shown Figures 9 to 11 The diagram shows the possible values ​​of the RU allocation subfield and the RU configuration. Figure 12a and Figure 12b The values ​​26, 52, 106, 78, and 132 shown can be the number of tones used by the RU. Each bit value in the RU allocation subfield can correspond to... Figure 12a and Figure 12b Each value of a specific column, and each RU can be assigned to a STA based on the configuration (or structure) of the RUs in the corresponding column.

[0175] STAs assigned to individual RUs via the RU allocation subfield can be identified by the user field located after the RU allocation subfield in the common field. That is, when the configuration of the RUs allocated to STAs and the number of STAs using each RU are set via each bit of the RU allocation subfield, the STAs assigned to individual RUs can be identified by the user field included in the user-specific field following the RU allocation subfield.

[0176] For example, when the RU allocation subfield is set to Figure 12a When assigning values ​​to the first row (B9:0, B8...B0:0), it can be a structure that assigns nine 26-tone RUs. In this case, the user field used to identify the STA corresponding to each 26-tone RU can be included in the user-specific field.

[0177] According to another embodiment of the present invention, an RU with a pitch less than 242-pitch RU can be referred to as a small RU or a small-size RU. Furthermore, an RU with a pitch of 242-pitch RU or greater than 242-pitch RU can be referred to as a large RU or a large-size RU. Figure 12a and Figure 12b This is an example showing RU allocation values ​​corresponding to small-sized RUs, while other examples include... Figure 13a and Figure 13b As shown, the RU allocation subfield can also indicate a large-size RU.

[0178] Figure 13a and Figure 13b The illustration shows another example of the RU allocation subfield according to an embodiment of the present invention.

[0179] and Figure 12a and Figure 12b Similarly, Figure 13a and Figure 13b It is shown Figures 9 to 11 The RU allocation subfield described herein can have values ​​and a graph of RU configurations. Figure 13a and Figure 13b The values ​​242, 484, 996, and 996x2 shown can be the number of tones used by the RU. Furthermore, certain values ​​in the RU allocation subfield can correspond to... Figure 13a and Figure 13b Certain columns can be used, and the RUs of the structures indicated by these columns can be assigned to STAs. Furthermore, the user field corresponding to the RU indicated by the RU assignment subfield can be located after the RU assignment subfield. For example, when the RU assignment subfield represents... Figure 13a When assigning values ​​to the first row (B9:1, B8...B0:00000y3y2y1y0), a structure of 242-tone RU can be used. In this case, a user field corresponding to the 242-tone RU can subsequently exist. Furthermore, Figure 13a and Figure 13b Each row shown can be used to partition users without additional OFDMA. That is, for example, when the RU allocation subfield represents... Figure 13a and 13b When the value of the fifth row (B9:1, B8...B0:00100y3y2y1y0) is represented as 242 and 484-tones, then 242-tone and 484-tone can be assigned together to a single user. Alternatively, different STAs can be assigned to the same RU via MIMO.

[0180] Furthermore, in one embodiment, an RU with a pitch less than 242-pitch RU can be referred to as a small RU or a small-size RU. Moreover, an RU with a pitch of 242-pitch RU or greater than 242-pitch RU can be referred to as a large RU or a large-size RU. Figure 13a and Figure 13b This is a diagram showing an example of RU allocation values ​​corresponding to large-size RUs, in addition to which, as Figure 12a and Figure 12b As shown, the RU allocation subfield can also indicate a small-size RU.

[0181] Figure 14 This is a diagram illustrating the EHT-SIG structure according to an embodiment of the present invention.

[0182] Figure 14 The embodiments are for solving Figure 11 The method for solving the problem can omit the same content as above.

[0183] According to embodiments of the present invention, an EHT-SIG structure capable of independently decoding the location indicator subfield and the RU allocation subfield can be provided. For example, the CRC and tail corresponding to the location indicator subfield and the CRC and tail corresponding to the RU allocation subfield can exist separately. (Refer to...) Figure 14 The EHT-SIG field or common field may include, in sequence, a position indicator subfield, a CRC, a tail, an RU allocation subfield, and a tail. That is, the CRC corresponding to the position indicator subfield may exist before the RU allocation subfield. Specifically, the CRC corresponding to the position indicator subfield may correspond to the number of bits (e.g., 4, 8, or 16) of the position indicator subfield starting from B0 of the EHT-SIG.

[0184] Additionally, the CRC corresponding to the RU allocation subfield can correspond to bits equal to (number of bits in the RU allocation subfield) * (number of RU allocation subfields) starting from the position indicator subfield, the CRC, and the bits after the tail.

[0185] Therefore, the receiver or decoder can first decode the value of the position indicator subfield and the corresponding CRC together, then determine the number of RU allocation subfields, and decode the RU allocation subfields and the corresponding CRC together. More specifically, the length of the position indicator subfield can be determined based on the frequency band value indicated by the U-SIG field. That is, as mentioned above, the length of the position indicator subfield can be determined based on the bandwidth of the PPDU indicated by the bandwidth field of the U-SIG field. Therefore, the position indicator subfield can be decoded together with the corresponding CRC. Furthermore, the number of RU allocation subfields can be identified based on the decoded position indicator subfield value, and the RU allocation subfields can be decoded together with the corresponding CRC.

[0186] According to another embodiment of the invention, the number of RU allocation subfields can be indicated by a field preceding the EHT-SIG field (e.g., the U-SIG field). In this case, it is possible to... Figure 9 Decoding is performed using the same structure described herein. That is, even when calculating the CRC based on the position indicator subfield and the RU allocation subfield, decoding can be performed because the length of the RU allocation subfield is known. For example, when the number of RU allocation fields can be identified by the bandwidth field of the U-SIG field preceding the EHT-SIG, the length of the RU allocation subfield can be known from the bandwidth field, so decoding can be performed even when the CRC is calculated based on the RU allocation subfield.

[0187] However, when signaling transmission can be freely performed due to signaling based on the location indicator subfield, the number of RU allocation subfields can vary depending on the subband (e.g., a 20MHz band), and all of these can increase signaling overhead, as indicated in the U-SIG field. Therefore, according to embodiments of the invention, the number of RU allocation subfields for each subband can be set to be the same. For example, the maximum number of RU allocation subfields actually transmitted with signaling in each subband can be indicated in the U-SIG field, and dummy RU allocation subfields can be inserted in subbands with a number less than the maximum.

[0188] According to another embodiment, the number of RU allocation subfields indicated by U-SIG can be allocated to each content channel in the same number and included in each content channel. However, if the number of RU allocation subfields indicated by U-SIG cannot be exactly divided according to the number of content channels, the number of RU allocation subfields allocated to each content channel can be divided with a difference of less than 1.

[0189] Figure 15 The illustration shows another example of the EHT-SIG structure according to an embodiment of the present invention.

[0190] Reference Figure 15 Depending on the encoding method, the common field can be divided for each coded block, and each coded block can include an RU allocation subfield. In this case, based on the bandwidth indicated by the bandwidth field of the U-SIG field, one or more coded blocks can be included, and each coded block can be encoded individually. Therefore, the STA can decode each coded block individually.

[0191] Specifically, Figure 15 The embodiments can be used to solve Figure 11 The issues described herein, and may be those mentioned above. Figure 14 This is an extension of the embodiments. Therefore, content identical to that described above can be omitted.

[0192] exist Figure 14In this embodiment, only the position indicator subfield can be used for CRC calculation, and the number of bits in the CRC and the tail can be greater than the number of bits in the position indicator subfield. That is, the redundancy can be considered large.

[0193] Therefore, according to embodiments of the present invention, the location indicator subfield and a preset number of RU allocation subfields can be used for CRC calculation. Additionally, CRC calculations can also exist for RU allocation subfields other than the preset number of RU allocation subfields. Therefore, referring to... Figure 15 The EHT-SIG field, or common field, can be divided into a first coding block and a second coding block based on the field to be encoded. In this case, the fields included in each coding block can be encoded together, and different coding blocks can be encoded separately. Therefore, the STA receiving the PPDU can decode each coding block individually according to the coding block.

[0194] like Figure 15 As shown, the first encoding block may include a position indicator subfield, a preset number of RU allocation subfields (at least one first RU allocation subfield), a CRC (first CRC), and a tail (first tail), and these are encoded together. The second encoding block may sequentially include the remaining RU allocation subfields (at least one second RU allocation subfield), a CRC (second CRC), and a tail (second tail), and these are encoded together. Figure 15 The diagram shows the case where the preset quantity is 1.

[0195] Therefore, the receiver or decoder can decode each coded block sequentially. Specifically, the receiver or decoder can first decode together the values ​​of the position indicator subfield and a preset number of RU allocation subfields in the first coded block, as well as the corresponding CRC, and then determine the number N of RU allocation subfields. If N is equal to or less than the preset number, then since the RU allocation subfields have already been transmitted by signaling, there are no additional RU allocation subfields, CRCs, and tails thereafter.

[0196] If N is greater than the preset number, then (N - (preset number)) additional RU allocation subfields, CRC, and tail can exist. Therefore, after the receiver or decoder decodes the first coded block, the (N - (preset number)) RU allocation subfields included in the second coded block can be decoded together with the corresponding CRC.

[0197] If N is 0, the RU allocation subfield that has already been transmitted via signaling can be dummy data, and subsequent RU allocation subfields, CRC, and tails may not exist. Therefore, the receiver can ignore the dummy data, and subsequent user fields may not exist.

[0198] RU1 (1 STA), RU2 (2 STAs), and RU3 (1 STA) are indicated, and the user-specific fields can sequentially include user field 1, user field 2, user field 3, and user field 4. In this case, user field 1 can correspond to RU1, user field 2 can correspond to RU2, user field 3 can correspond to RU2, and user field 4 can correspond to RU3. Furthermore, if multiple users are assigned to the same RU, as with RU2 (2 STAs), MIMO can be used.

[0199] In this case, the number of coded blocks can vary depending on the bandwidth of the PPDU indicated by the bandwidth field of the U-SIG field. For example, if the bandwidth of the PPDU indicated by the bandwidth field is 20, 40, or 80 MHz, then only one coded block can be included in the common field since only one or two RU allocation subfields are needed. In this case, if the indicated bandwidth is 20 MHz or 40 MHz, one RU allocation subfield can be included, and if the indicated bandwidth is 80 MHz, two RU allocation subfields can be included.

[0200] The number of RU allocation subfields included in each EHT-SIG content channel can be represented by the number of RU allocation subfields with bandwidth indicated by the bandwidth field.

[0201] In this case, since the number of encoded blocks included in the common field of the EHT-SIG field is 1, the values ​​of the position indicator subfield and the preset number of RU allocation subfields can be decoded together with the corresponding CRC.

[0202] However, since three or more RU allocation subfields are required when the bandwidth of the PPDU indicated by the bandwidth field is equal to or greater than 160MHz (e.g., 160MHz or 320MHz), two coded blocks can be included in the common field. In this case, since the first and second coded blocks, as two coded blocks, are encoded and / or decoded separately, each coded block can include its own CRC and tail.

[0203] As described above, the first coding block may include a position indicator subfield, at least one RU allocation subfield, CRC, and a tail, and the second coding block may include at least one RU allocation subfield, CRC, and a tail.

[0204] In this case, the first coded block may also additionally include a space reuse subfield indicating space reuse, a GI+LTF size subfield indicating GI duration and EHT-LTF size, an EHTLTF symbol number field indicating the number of EHT-LTF symbols, an LDPC extra symbol sequence subfield indicating the presence of an LDPC extra symbol sequence, a pre-FEC padding factor subfield indicating the pre-FEC padding factor, a PE disambiguation subfield indicating PE disambiguation, etc., and these are encoded / decoded together.

[0205] Figure 16 The illustration shows an example of an EHT-SIG structure according to an embodiment of the present invention, where the bandwidth of the PPDU is 20MHz or 40MHz. Figure 16 Descriptions identical to those described above will be omitted.

[0206] According to embodiments of the present invention, the location indicator subfield may be omitted based on bandwidth (or channel width). The bandwidth may be the PPDU bandwidth. Alternatively, the bandwidth may be a bandwidth value included in the U-SIG field. For example, when the bandwidth is 20MHz or 40MHz, the location indicator subfield may be omitted.

[0207] In an embodiment, if the bandwidth is 20MHz, a single RU allocation subfield may exist. Furthermore, the RU allocation subfield may correspond to a 20MHz frequency band. Therefore, referring to... Figure 16 The EHT-SIG field or common field may include a RU allocation subfield, CRC, and a tail. Additionally, the CRC may be assigned to a RU allocation subfield.

[0208] In one embodiment, if the bandwidth is 40MHz, two RU allocation subfields can exist within all content channels as a whole. Therefore, each of the two content channels can include one RU allocation subfield, and can include a corresponding CRC and a tail. In another embodiment, when the bandwidth is 40MHz, each content channel can include two RU allocation subfields, and can include a CRC and a tail corresponding to the two RU allocation subfields. In this case, compared to dividing the RU allocation subfields into one per content channel, RU allocation signaling transmission can be performed with greater flexibility. Furthermore, dividing the RU allocation subfields into one per content channel can have the advantage of reducing signaling overhead.

[0209] According to an embodiment of the present invention, when the bandwidth is equal to or greater than 80MHz, a location indicator subfield may exist.

[0210] Figure 17 The figure illustrates the EHT-SIG structure of an 80MHz PPDU according to an embodiment of the present invention.

[0211] exist Figure 17 In the embodiments described above, the same content as above can be omitted, and the number of bits in a RU allocation subfield can be represented as N_RA.

[0212] According to an embodiment of the present invention, when the bandwidth is 80MHz, a location indicator subfield may be included. When the bandwidth is 80MHz, the location indicator subfield may be the location indicator subfield as described above.

[0213] For example, the location indicator subfield can be 4 bits, and each bit can correspond to a 20MHz frequency band. In signaling transmission based on the location indicator subfield, if each bit of the location indicator subfield indicates a 20MHz frequency band, then each content channel can have up to four RU allocation subfields. However, in order to reduce the signaling overhead of the EHT-SIG field by using multiple content channels, the number of RU allocation subfields that can be included in each content channel can be limited. This is because, when the bandwidth is 80MHz, if a maximum of four RU allocation subfields are used throughout the content channel, all types of RU allocations can be transmitted by signaling. Therefore, according to embodiments of the present invention, one or two RU allocation subfields can exist in each content channel. Furthermore, the number of content channels can be two. Figure 17 (a) shows an example where two content channels each include a 4-bit location indicator subfield, one or two RU allocation subfields, CRC, and a tail. In this case, see reference... Figure 11 As mentioned above, there may be a problem where the length of the RU allocation subfield cannot be known before confirming the location indicator subfield. Therefore, this can be addressed by using a reference... Figures 14 to 15 The described embodiments address this problem.

[0214] However, in Figure 17 In embodiment (a), there are only two scenarios: one or two RU allocations in each content channel, but these scenarios are indicated by a 4-bit position indicator subfield. Therefore, to reduce signaling overhead, the number of RU allocation subfields can be indicated by 1 bit of signaling. For example, 1 bit of signaling can be included in a common field.

[0215] Reference Figure 17 (b) The More RU allocation subfield can be the 1-bit signaling described above. Therefore, each content channel can include a More RU allocation subfield, one or two RU allocation subfields, CRC, and a tail. In this case, as referenced... Figure 11 The aforementioned issue may similarly exist where the length of the RU allocation subfield cannot be known before confirming the location indicator subfield. During confirmation... Figure 17Before (b) more RU allocation subfields, there may be a problem that the length of the RU allocation subfield cannot be known.

[0216] Therefore, to solve this problem, one can use Figures 14 to 15 The embodiment shown. In Figures 14 to 15 In one embodiment, a more RU allocation subfield can be used instead of a location indicator subfield. That is, the CRC corresponding to the more RU allocation subfield can exist independently of the CRC used for the RU allocation subfield. Alternatively, the more RU allocation subfield and a predetermined number (1) of RU allocation subfields can be used in the CRC calculation, and if other RU allocation subfields exist, the CRC and tail can be additionally present. Therefore, the more RU allocation subfield can be decoded even if the number of RU allocation subfields is unknown. In another embodiment, the more RU allocation subfield can be included in the U-SIG field. For example, the more RU allocation subfield included in the U-SIG field can be a subfield used for other purposes if it is not an 80MHz PPDU. For example, puncture information or bandwidth fields can be used as more RU allocation subfields.

[0217] according to Figure 17 In embodiment (c), the location indicator subfield or more RU allocation subfields may be absent. With an 80MHz bandwidth, because the number of bits in the location indicator subfield or more RU allocation subfields is less than the number of bits in the case of using a larger bandwidth, these bits can be omitted, and multiple RU allocation subfields can be included. For example, each content channel may include two RU allocation subfields. Therefore, as... Figure 17 As shown in (c), when the number of content channels is 2, there are a total of 4 RU allocation subfields, which can represent all RU allocations. Therefore, it can be implemented more simply compared to the case of decoding a location indicator subfield or more RU allocation subfields. In another embodiment, each content channel can include four RU allocation subfields. In this case, the four RU allocation subfields can each correspond to a 20MHz frequency band. That is, the advantage is that all 80MHz frequency bands can be transmitted in signaling in each content channel, and signaling transmission freedom can be provided.

[0218] because Figure 17 The position indicator subfield in embodiment (a) functions as follows: Figure 17 (b) and Figure 17 The embodiment in (c) is reduced, so it may be necessary to determine the corresponding Figure 17 (b) and Figure 17The location of the channel (frequency band) in the RU allocation subfield of (c). For example, the RU allocation subfield can correspond to preset channels respectively. For example, the RU allocation subfield of content channel 1 can correspond to the first 20MHz channel and the third 20MHz channel starting from the low frequency. In addition, the RU allocation subfield of content channel 2 can correspond to the second 20MHz channel and the fourth 20MHz channel starting from the low frequency. The channel corresponding to the RU allocation subfield of each content channel is not limited to this and can be another preset channel.

[0219] Figure 18 The illustration shows an example of a central 26-tone RU signaling according to an embodiment of the present invention. Figure 18 In the embodiments, references may be omitted. Figure 17 The content of the explanation, etc.

[0220] According to embodiments of the present invention, the bandwidth of a PPDU may include a center 26-tone RU. For example, the center 26-tone RU may be a 26-tone RU present in the middle of an 80MHz PPDU. Additionally, when the subcarrier index of the DC tone is set to 0, the center 26-tone RU may be an RU with subcarrier indices [-16:-4, 4:16]. This may be the index in the case of an 80MHz PPDU. In the case of a 160(80+80)MHz PPDU, the center 26-tone RU may exist in the middle of each 80MHz. That is, two center 26-tone RUs may exist. In the case of a 160(80+80)MHz PPDU, the subcarrier indices of the two center 26-tone RUs may be [-528:-516, -508:-496] and [496:508, 516:528]. Furthermore, in the case of 240MHz and 320MHz PPDU, there can be three center 26-tone RUs and four center 26-tone RUs.

[0221] According to an embodiment of the present invention, when the bandwidth is 20MHz or 40MHz, the central 26-tone RU signaling may not exist.

[0222] According to an embodiment of the present invention, when the bandwidth is 80MHz, center 26-tone RU signaling transmission can exist. (Refer to...) Figure 18Central 26-tone RU signaling transmission can be performed via the Central 26-tone RU subfield. According to an embodiment, if the value of the Central 26-tone RU subfield is 1, it means that the Central 26-tone RU has been assigned to a user, or that a corresponding user field exists. Conversely, if the value of the Central 26-tone RU subfield is 0, it means that no user has been assigned to the Central 26-tone RU, and no corresponding user field exists. If the value of the Central 26-tone RU subfield is 1, the corresponding user field can exist later in the same content channel. In this case, CRC can be calculated by including the Central 26-tone RU subfield.

[0223] Reference Figure 18 In (a), the center 26-tone RU subfield can exist in all content channels. This has the advantage that the center 26-tone RU can perform signaling transmission on any content channel and has signaling freedom. In this case, the user field for the center 26-tone RU can exist only in the content channel where the center 26-tone RU subfield is set to 1. In another embodiment, the center 26-tone RU subfield can exist in all content channels, and its value can be the same. Therefore, even if the receiver is focused on any content channel, it can confirm signaling regarding the center 26-tone RU.

[0224] Reference Figure 18 In (b), only one center 26-tone RU subfield can exist in the preset content channel. In this case, with Figure 18 Compared to embodiment (a), the advantage is that signaling overhead can be reduced. The preset content channel can be content channel 1. Furthermore, content channel 1 can be a content channel corresponding to a 20MHz channel with the lowest frequency. Alternatively, content channel 1 can be a content channel corresponding to channel P20. Furthermore, when the channel transmitted by signaling in the preset content channel is punctured, the center 26-tone RU subfield can exist in another content channel. For example, the location of the center 26-tone RU can be determined based on the puncturing information included in the U-SIG field. Furthermore, the user field corresponding to the center 26-tone RU can be transmitted by signaling on the content channel where the center 26-tone RU subfield exists.

[0225] Figure 19 The illustration shows another example of the central 26-tone RU signaling according to an embodiment of the present invention. Figure 19 In the embodiments described above, the same content as above may be omitted, and the above embodiments may be used in combination.

[0226] According to embodiments of the present invention, the EHT-SIG signaling for the primary channel and for channels other than the primary channel can be different. Alternatively, the center 26-tone RU signaling for the primary channel and for channels other than the primary channel can be different. Therefore, the number (or length) of the center 26-tone RU subfield of the primary channel can differ from the number (or length) of the center 26-tone RU subfield of the non-primary channel. The primary channel can be a primary 80MHz channel or a primary 160MHz channel.

[0227] According to embodiments of the present invention, the EHT-SIG of the main channel may include signaling for all center 26-tone RUs. For example, the EHT-SIG of the main 80MHz channel may include signaling for all center 26-tone RUs. That is, when the bandwidth is 160(80+80), 320(160+160), and 240(80+160 or 160+80)MHz, signaling for 2, 4, and 3 center 26-tone RUs may be included in the main channel, respectively. In another embodiment, the main channel may be a main 160MHz channel. By including signaling for all center 26-tone RUs in the main channel, the signaling degrees of freedom of the main channel can be obtained. Furthermore, the signaling for all center 26-tone RUs can be distributed to content channels. For example, signaling for two center 26-tone RUs existing in 160(80+80)MHz may be included in each of the two content channels. Furthermore, each of the two content channels may include two signaling entries for four center 26-tone RUs existing at 320 (160+160) MHz. Alternatively, each of the two content channels may include two and one (or one and two) signaling entries for three center 26-tone RUs existing at 240 (80+160 or 160+80) MHz. Therefore, in the case of 160 (80+80) MHz, each content channel may include a 1-bit center 26-tone RU subfield. Furthermore, in the case of 320 (160+160) MHz, each content channel may include a 2-bit center 26-tone RU subfield. Furthermore, in the case of 240 (80+160 or 160+80) MHz, the two content channels may each include a 2-bit and a 1-bit (or a 1-bit and 2-bit) center 26-tone RU subfield.

[0228] Reference Figure 19 In the section denoted as P80, each content channel includes a 1-bit or 2-bit center 26-tone RU subfield.

[0229] In another embodiment, to allow for signaling freedom, each content channel may include signaling for all center 26-tone RUs. Therefore, when the bandwidth is 160 (80+80), 320 (160+160), and 240 (80+160 or 160+80) MHz, each content channel may include signaling for a 2-bit center 26-tone RU subfield, a 4-bit center 26-tone RU subfield, and a 3-bit center 26-tone RU subfield.

[0230] Furthermore, static puncturing can be performed. Static puncturing can mean puncturing a specific channel when any PPDU is transmitted. Moreover, static puncturing doesn't have to be the dynamic puncturing determined with each PPDU transmission. Additionally, static puncturing can be determined during the association process. If static puncturing is performed, the center 26-tone RU subfield of the center 26-tone RU included in or spanning the channel through static puncturing can be set to 0. That is, the user cannot be assigned a center 26-tone RU. Alternatively, in the case of static puncturing, the center 26-tone RU subfield of the center 26-tone RU included in or spanning the channel through static puncturing may not exist. Therefore, the presence or absence of the center 26-tone RU subfield or the number of center 26-tone RU subfields can be determined based on static puncturing.

[0231] According to embodiments of the present invention, STAs can exist that transmit or receive PPDUs on channels that are not the primary channel. This can be referred to as STAs parking on non-primary channels. By parking STAs on non-primary channels, the congestion on the primary channel can be alleviated.

[0232] According to an embodiment of the invention, any RU can be assigned to a STA parked in a non-primary channel. In this case, the EHT-SIG for a non-primary channel can include signaling for all center 26-tone RUs. Therefore, the EHT-SIG for the primary channel and the EHT-SIG for a non-primary channel can have the same structure, and the center 26-tone RU signaling for the primary channel can be applied to the non-primary channel.

[0233] According to another embodiment of the invention, the channels that can be assigned to STAs parked in non-primary channels can be limited to 80 MHz. For example, the channels that can be assigned to the EHT-SIG field of a specific channel can be limited to 80 MHz including that specific channel. (See also...) Figure 19The range of signaling transmission via EHT-SIG through the 80MHz subband can be limited to the 80MHz subband. In this case, a center 26-tone RU can exist in the 80MHz subband outside the main 80MHz channel. Therefore, as... Figure 18 The central 26-tone RU signaling transmission method described herein can be applied to channels that are not the primary 80MHz channel. (See reference...) Figure 19 It can be applied on channels other than the primary 80MHz channel. Figure 18 The central 26-tone RU signaling transmission method described in (a). Therefore, in Figure 19 In the 80MHz subband 2, the center 26-tone RU transmitted via signaling is one unit for PPDU bandwidths of 160, 320, and 240MHz, and... Figure 19 The example shown is an example of transmitting the central 26-tone RU via signaling in all content channels.

[0234] According to another embodiment of the invention, the channels that can be assigned to STAs parked in non-primary channels can be limited to 160MHz. For example, the channels that can be assigned to the EHT-SIG field of a specific channel can be limited to 160MHz including that specific channel. (See also...) Figure 19 The range that can be transmitted by EHT-SIG signaling from each 80MHz sub-band can be limited to include the P160 channel or S160 channel of the corresponding 80MHz sub-band. In this case, the number of center 26-tone RUs transmitted by signaling from an 80MHz sub-band that is not the main 80MHz channel can be two. Therefore, if two center 26-tone RUs can be transmitted by signaling on all content channels, each content channel can include a 2-bit center 26-tone RU subfield. Alternatively, when two center 26-tone RU signalings are divided into two content channels, a 1-bit center 26-tone RU subfield can be included in each content channel. Figure 19 The 80MHz subband 2 EHT-SIG can represent this situation.

[0235] If the bandwidth is 240MHz, then when the two 80MHz channels other than the main 80MHz channel are designated as non-P80 channel 1 and non-P80 channel 2, two center 26-tone RUs can be transmitted by signaling as described above in non-P80 channel 1, and center 26-tone RUs can be transmitted by signaling as described above in non-P80 channel 2 when the channels that can be allocated are limited to 80MHz.

[0236] Figure 20 The illustration shows another example of the central 26-tone RU signaling according to an embodiment of the present invention. Figure 20In the embodiments described above, the same content as above may be omitted, and the above embodiments may be used in combination.

[0237] According to embodiments of the present invention, all center 26-tone RUs can be transmitted via signaling in an EHT-SIG transmitted over any channel. Therefore, the length (or number) of the center 26-tone RU subfield can be determined based on bandwidth. If the bandwidth is less than 80 MHz, the center 26-tone RU subfield may not exist.

[0238] Furthermore, when the bandwidth is 80, 160 (80+80), 240 (80+160 or 160+80), or 320 (160+160) MHz, the center 26-tone RU subfield can have 1, 2, 3, and 4 bits, respectively. According to an embodiment, when the center 26-tone RU subfield can have multiple bits, each bit can be mapped from the low-frequency center 26-tone RU to the high-frequency center 26-tone RU.

[0239] exist Figures 18 to 20 The middle 26-tone RU subfield described herein can be used together with the RU allocation subfield for CRC calculation. Alternatively, Figures 18 to 20 The Middle 26-Tone RU subfield described herein can be used together with the Position Indicator subfield and the RU Allocation subfield for CRC calculation. Alternatively, the Middle 26-Tone RU subfield may not exist as an independent subfield, but rather some bits of the Position Indicator subfield may serve as its function. That is, some bits of the Position Indicator subfield may be used as Middle 26-Tone RU signaling.

[0240] Figure 21 The illustration shows another example of the EHT-SIG structure according to an embodiment of the present invention.

[0241] According to embodiments of the present invention, the EHT-SIG field may include a dummy RU allocation subfield. The dummy RU allocation subfield may be a dummy RU allocation subfield or dummy data as mentioned in the above embodiments. Furthermore, the dummy RU allocation subfield may represent one of the possible values ​​that an RU allocation subfield may have. That is, an RU allocation subfield set to a specific value may be referred to as a dummy RU allocation subfield.

[0242] Furthermore, the length (number of bits) of the dummy RU allocation subfield can be equal to the length (number of bits) of the RU allocation subfield. Additionally, multiple dummy RU allocation subfields can exist within a single content channel.

[0243] According to embodiments of the present invention, the position indicator subfield can indicate the presence of a dummy RU allocation subfield. For example, the dummy RU allocation subfield can be indicated in the same way as the position indicator subfield indicates the RU allocation subfield. That is, if a bit in the position indicator subfield is 1, it can indicate either an RU allocation subfield or a dummy RU allocation subfield. Furthermore, bits with a value of 1 in the position indicator subfield can be mapped to sequentially arranged RU allocation subfields or dummy RU allocation subfields. Therefore, the number of bits with a value of 1 in the position indicator subfield can be equal to the sum of the number of RU allocation subfields and the number of dummy RU allocation subfields. Moreover, compared to RU allocation subfields, the dummy RU allocation subfield can be located at any position.

[0244] Figure 21 The diagram illustrates the structure of the common fields in the EHT-SIG field. (Refer to...) Figure 21 The position indicator subfield, RU allocation subfield, dummy RU allocation subfield, middle 26-tone RU subfield, CRC, and tail can be included in the EHT-SIG field. In this case, refer to... Figures 14 to 16 The above may include multiple RU allocation subfields.

[0245] In the diagram, multiple RU allocation subfields are shown as a single RU allocation subfield. Furthermore, dummy RU allocation subfields are shown as lined areas. (See also...) Figure 21 The dummy RU allocation subfield can exist in content channel 1. Furthermore, the location indicator subfield can indicate the presence and location of the dummy RU allocation subfield. Figure 21 An example is shown where the dummy RU allocation subfield is located before the RU allocation subfield.

[0246] According to an embodiment, the dummy RU allocation subfield may not indicate RU configuration or allocation. Furthermore, the dummy RU allocation subfield may indicate that there is no corresponding user or no allocated RU, and is independent of the number of tones and / or bandwidth. Therefore, a user field corresponding to the dummy RU allocation subfield may not exist.

[0247] Therefore, when the receiver parses the EHT-SIG, the bits of the dummy RU allocation subfield and the position indicator subfield corresponding to the dummy RU allocation subfield can be ignored. For example, when the position indicator subfield is set to 11001000 (B0B1...B7), it can be followed by a total of 3 RU allocation subfields and dummy RU allocation subfields. If arranged in the order of RU allocation subfield 1, dummy RU allocation subfield, and RU allocation subfield 2, then RU allocation subfield 1 can correspond to B0, the dummy RU allocation subfield can correspond to B1, and RU allocation subfield 2 can correspond to B4. Therefore, RU allocation subfield 2 can be RU allocation information for the frequency position corresponding to B4. Furthermore, for user fields, after the user field corresponding to RU allocation subfield 1, there can be a user field corresponding to RU allocation subfield 2. The user field corresponding to the dummy RU allocation subfield may not exist.

[0248] In another embodiment, when location indicator subfields exist in multiple content channels, the presence and quantity of dummy RU allocation subfields can be determined based on the number of RU allocation subfields indicated by the location indicator subfields of each content channel. For example, when the number of RU allocation subfields indicated by the location indicator subfields in content channel 1 is N1, the number of RU allocation subfields indicated by the location indicator subfields in content channel 2 is N2, ..., and the number of RU allocation subfields indicated by the location indicator subfields in content channel n is Nn, the presence and quantity of dummy RU allocation subfields can be determined based on N1, N2, ..., Nn. More specifically, the presence and quantity of dummy RU allocation subfields can be determined based on the maximum value among N1, N2, ..., Nn. For example, the number of RU allocation subfields in content channel m can be: ((maximum value among N1, N2, ..., Nn) - Nm). Therefore, the values ​​of the number of RU allocation subfields and the number of dummy RU allocation subfields in each content channel can be constant. In this case, the position of the dummy RU allocation subfields can be preset. For example, the position of the dummy RU allocation subfield can be after the RU allocation subfield and before the middle 26-tone RU subfield.

[0249] By using a dummy RU allocation subfield, the length of the field can be controlled in each channel. For example, the beginning and end of the RU allocation subfield and the dummy RU allocation subfield can be controlled to be the same in each channel. (See reference...) Figure 21Although the length of the RU allocation subfield of content channel 2 is greater than the length of the RU allocation subfield of content channel 1, since content channel 1 includes a dummy RU allocation subfield, the sum of the lengths of the RU allocation subfield of content channel 1 and the dummy RU allocation subfield can be equal to the length of the RU allocation subfield of content channel 2. Therefore, it has the advantage of being easier to implement when generating or decoding EHT-SIG.

[0250] Figure 22 This is a flowchart illustrating an example of a PPDU receiving and decoding method according to an embodiment of the present invention.

[0251] Reference Figure 22 The non-access point (AP) STA can receive the preamble of the PPDU from the AP (S22010). The preamble of the PPDU can have the same characteristics as the referenced one. Figures 14 to 16 The descriptions have the same leading structure. For example, a PPDU can be an EHT PPDU, and an EHT PPDU can be a SU PPDU or a MU PPDU.

[0252] For reference Figure 15 The PPDU preamble may include an EHT-SIG field containing one or more EHT SIG content channels, and each of the one or more EHT SIG content channels may include a common field and a user-specific field.

[0253] The public field may include a specific field (e.g., a location indicator subfield), at least one first resource unit (RU) allocation subfield, a first CRC, and a first tail, and depending on specific conditions, the public field may also include at least one second resource unit allocation subfield, a second CRC, and a second tail.

[0254] In this case, a specific field (e.g., a location indicator subfield), at least one first resource unit (RU) allocation subfield, a first CRC, and a first tail can constitute a first coding block, and at least one second resource unit allocation subfield, a second CRC, and a second tail can constitute a second coding block.

[0255] In this case, as described above, the first coding block may also include a space reuse subfield indicating whether space reuse is used, a GI+LTF size subfield indicating the GI duration and the size of the EHHT-LTF, an EHT LTF symbol number field indicating the number of EHT-LTF symbols, an LDPC extra symbol sequence subfield indicating whether an LDPC extra symbol sequence exists, a pre-FEC padding factor subfield indicating the pre-FEC padding factor, a PE disambiguation subfield indicating PE disambiguation, etc.

[0256] In this case, as mentioned above, the second coding block may not be included based on the bandwidth of the PPDU indicated by the bandwidth field of the U-SIG field.

[0257] Subsequently, the STA can identify the packet configuration of the received preamble (S22020). That is, the STA can identify the format of the preamble of the received PPDU.

[0258] For example, the STA can identify whether a public field also includes at least one second RU allocation subfield. That is, the STA can identify whether the public field includes a first coded block in addition to a second coded block.

[0259] Specifically, the STA can identify whether at least one second RU allocation subfield is included based on a specific field preceding at least one first RU allocation subfield. For example, the size and value of the location indicator subfield can be determined based on the bandwidth of the PPDU indicated by the bandwidth field of the U-SIG field, and the number of first and second RU allocation subfields can be identified based on the location indicator subfield. Based on this, the STA can identify whether the second RU allocation subfield is included, and whether the second coding block is included in the common field.

[0260] That is, it is possible to determine (or identify) whether at least one second RU allocation subfield is included in the public field based on the bandwidth indicated by the bandwidth field based on U-SIG.

[0261] Furthermore, as mentioned above, for one or more EHT-SIG content channels, some fields of the common fields can be set to the same value, while the remaining fields can be set to different values ​​respectively.

[0262] For example, some or all bits of a specific field (e.g., the location indicator subfield) can be set to the same value for all content channels. In this case, fields that can be set to the same value include some bits of the location indicator subfield, the spatial reuse subfield, the GI+LTF size subfield, the EHT LTF symbol number segment, the LDPC extra symbol sequence subfield, the pre-FEC padding factor subfield, and the PE disambiguation subfield, etc.

[0263] Furthermore, as mentioned above, each coded block can be encoded / decoded individually. That is, at least one first RU allocation subfield and at least one second RU allocation subfield can be encoded / decoded separately.

[0264] As described above, the STA that identifies the packet configuration can perform decoding based on the identified packet configuration (e.g., whether it includes a second coding block and / or at least one second RU allocation subfield) (S22030).

[0265] Subsequently, the STA can receive PPDU data based on the decoded preamble. That is, it can receive PPDU data through the RU assigned by the preamble.

[0266] Figure 23 This is a flowchart illustrating a method for generating and sending PPDU according to an embodiment of the present invention.

[0267] Specifically, the AP can generate a PPDU (S23010) that will be sent to at least one STA. In this case, the PPDU may include a preamble and data.

[0268] The leader of a PPDU can have the same characteristics as the reference. Figures 14 to 16 The descriptions have the same leading structure. For example, a PPDU can be an EHT PPDU, and an EHT PPDU can be a SU PPDU or a MU PPDU.

[0269] For reference Figure 15 The PPDU preamble may include an EHT-SIG field containing one or more EHT SIG content channels, and each of the one or more EHT SIG content channels may include a common field and a user-specific field.

[0270] The public field may include a specific field (e.g., a location indicator subfield), at least one first resource unit (RU) allocation subfield, a first CRC, and a first tail, and depending on specific conditions, the public field may also include at least one second resource unit allocation subfield, a second CRC, and a second tail.

[0271] In this case, a specific field (e.g., a location indicator subfield), at least one first resource unit (RU) allocation subfield, a first CRC, and a first tail can constitute a first coding block, and at least one second resource unit allocation subfield, a second CRC, and a second tail can constitute a second coding block.

[0272] In this case, as described above, the first coding block may further include a space reuse subfield indicating whether space reuse is used, a GI+LTF size subfield indicating the GI duration and the size of the EHHT-LTF, an EHT LTF symbol number field indicating the number of EHT-LTF symbols, an LDPC extra symbol sequence subfield indicating whether an LDPC extra symbol sequence exists, a preFEC padding factor subfield indicating the preFEC padding factor, and a PE disambiguation subfield indicating PE disambiguation, etc.

[0273] In this case, as mentioned above, the second coding block may not be included based on the bandwidth of the PPDU indicated by the bandwidth field of the U-SIG field.

[0274] Specifically, whether at least one second RU allocation subfield is included can be identified based on a specific field preceding at least one first RU allocation subfield. For example, the size and value of the location indicator subfield can be determined based on the bandwidth of the PPDU indicated by the bandwidth field of the U-SIG field, and the number of first and second RU allocation subfields can be identified based on the location indicator subfield. Therefore, whether the second RU allocation subfield is included and whether the second coding block is included in the common field can be identified based on the bandwidth of the PPDU.

[0275] That is, it is possible to determine (or identify) whether at least one second RU allocation subfield is included in the public field based on the bandwidth indicated by the bandwidth field based on U-SIG.

[0276] Furthermore, as mentioned above, for one or more EHT-SIG content channels, some fields of the common fields can be set to the same value, while the remaining fields can be set to different values ​​respectively.

[0277] For example, some or all bits of a specific field (e.g., the location indicator subfield) can be set to the same value for all content channels. In this case, fields that can be set to the same value include some bits of the location indicator subfield, the spatial reuse subfield, the GI+LTF size subfield, the EHT LTF symbol number segment, the LDPC extra symbol sequence subfield, the pre-FEC padding factor subfield, and the PE disambiguation subfield, etc.

[0278] Furthermore, as mentioned above, each coded block can be encoded / decoded individually. That is, at least one first RU allocation subfield and at least one second RU allocation subfield can be encoded / decoded separately.

[0279] Then, the AP can send the generated PPDU to at least one STA (S23020) through each RU.

[0280] The above description of the invention is for illustrative purposes only. Those skilled in the art will understand that other specific forms can be readily derived without altering the technical concept or essential features of the invention. Therefore, the above embodiments should be understood as exemplary in all respects and not restrictive. For example, each constituent element described as a single structure can be implemented separately, or similarly, constituent elements described separately can be implemented in a combined form.

[0281] The scope of this invention is set forth by the appended claims, rather than by a detailed description, and all variations or modifications derived from the meaning and scope of the claims and their equivalents shall be construed as being included within the scope of this invention.

Claims

1. A terminal configured to operate in a wireless communication system, comprising: Communication module; and The processor controls the communication module. The processor is configured as follows: Receive EHT Physical Layer Protocol Data Units (PPDUs) from the access point (AP), which include one or more Very High Throughput EHT-Signal (SIG) content channels. Each of the one or more EHT-SIG content channels includes a user-specific field and a common field, wherein the common field includes at least one first resource unit (RU) allocation subfield; and Specifically, a specific field preceding the at least one first RU allocation sub-field is used to identify whether the public field includes at least one second RU allocation sub-field after the at least one first RU allocation sub-field, and Decode the common fields included in the EHT PPDU. The common field includes: i) a first coding block to which the at least one first RU allocation subfield is encoded, and ii) a second coding block to which the at least one second RU allocation subfield is encoded when the common field also includes the at least one second RU allocation subfield. Wherein, when the EHT PPDU includes two or more EHT-SIG content channels, the specific field corresponding to each of the two or more EHT-SIG content channels is set to the same value.

2. The terminal according to claim 1, wherein, Each of the first and second encoded blocks is decoded separately.

3. The terminal according to claim 1, wherein, The at least one first RU allocation subfield, together with the first cyclic redundancy check (CRC) and the first tail, is encoded into the first coding block, and The at least one second RU allocation subfield is encoded into the second coding block together with the second CRC and the second tail.

4. The terminal according to claim 1, wherein, The specific field is related to the bandwidth used to transmit the EHT PPDU.

5. The terminal according to claim 4, wherein, According to the bandwidth, the one or more EHT-SIG content channels are transmitted in each predetermined bandwidth.

6. The terminal according to claim 1, wherein, The specific field is used to identify the number of the at least one first RU allocation sub-field, whether the public field includes the at least one second RU allocation sub-field, and the number of the at least one second RU allocation sub-field.

7. A method for a terminal to receive data in a wireless communication system, the method comprising: Receive EHT Physical Layer Protocol Data Units (PPDUs) from the access point (AP), which include one or more Very High Throughput EHT-Signal SIG content channels. Each of the one or more EHT-SIG content channels includes a user-specific field and a common field, wherein the common field includes at least one first resource unit (RU) allocation subfield, and Wherein, a specific field preceding the at least one first RU allocation subfield is used to identify whether the public field includes at least one second RU allocation subfield after the at least one first RU allocation subfield; and Decode the common fields included in the EHT PPDU. The common field includes: i) a first coding block to which the at least one first RU allocation subfield is encoded, and ii) a second coding block to which the at least one second RU allocation subfield is encoded when the common field also includes the at least one second RU allocation subfield. Wherein, when the EHT PPDU includes two or more EHT-SIG content channels, the specific field corresponding to each of the two or more EHT-SIG content channels is set to the same value.

8. The method according to claim 7, wherein, Each of the first and second encoded blocks is decoded separately.

9. The method according to claim 7, wherein, The at least one first RU allocation subfield, together with the first cyclic redundancy check (CRC) and the first tail, is encoded into the first coding block, and The at least one second RU allocation subfield is encoded into the second coding block together with the second CRC and the second tail.

10. The method according to claim 7, wherein, The specific field is related to the bandwidth used to transmit the EHT PPDU.

11. The method according to claim 10, wherein, According to the bandwidth, the one or more EHT-SIG content channels are transmitted in each predetermined bandwidth.

12. The method according to claim 7, wherein, The specific field is used to identify the number of the at least one first RU allocation sub-field, whether the public field includes the at least one second RU allocation sub-field, and the number of the at least one second RU allocation sub-field.

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