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

Abstract

This invention provides a method for receiving PPDU in a wireless communication system. [Solution] The terminal receives an EHT PPDU (Physical Layer Protocol Data Unit) from an AP (Access Point) that includes one or more EHT (Extremely High Throughput)-SIG (signal) content channels. Each of the one or more EHT-SIG content channels includes a common field containing at least one first resource unit (RU) assignment subfield and a user-specific field. The STA then identifies whether the common field further includes at least one second RU assignment subfield and can decode the PPDU based on whether the common field further includes at least one second RU assignment subfield.

Description

Technical Field

[0001] The present invention relates to a wireless communication system. More specifically, the present invention relates to a wireless communication method and a wireless communication terminal for efficiently signaling extremely high-speed signaling field information in a wireless communication system.

Background Art

[0002] Recently, as the popularity of mobile devices has spread, wireless LAN (Local Area Network) technology that can provide fast wireless Internet services to them has been in the spotlight. Wireless LAN technology is a technology that enables mobile devices such as smartphones, smart pads, laptop PCs, portable multimedia players, and embedded devices to be wirelessly connected to the Internet in homes, enterprises, or specific service-providing areas based on wireless communication technology.

[0003] Since IEEE (Institute of Electrical and Electronics Engineers) 802.11 supported the initial wireless LAN technology using a 2.4 GHz frequency, various technology standards have been put into practical use or are under development. First, IEEE 802.11b uses a frequency in the 2.4 GHz band and supports a communication speed of up to 11 Mbps. IEEE 802.11a, which was commercialized after IEEE 802.11b, uses a frequency in the 5 GHz band instead of the 2.4 GHz band, reducing the impact on interference compared to the rather congested 2.4 GHz band frequency, and using OFDM (Orthogonal Frequency Division Multiplexing) technology to improve the communication speed up to 54 Mbps. However, IEEE 802.11a has the disadvantage of having a shorter communication distance compared to IEEE 802.11b. And IEEE 802.11g uses the same 2.4 GHz band frequency as IEEE 802.11b to achieve a maximum communication speed of 54 Mbps, satisfies backward compatibility, and has received considerable attention, but is also superior to IEEE 802.11a in terms of communication distance.

[0004] Furthermore, IEEE 802.11n is a technical standard established to overcome the limitations in communication speed that had been pointed out as a vulnerability in wireless LANs. The purpose of IEEE 802.11n is to increase network speed and reliability and extend the operating range of wireless networks. Specifically, IEEE 802.11n supports high throughput (HT) with a data processing speed of up to 540 Mbps or more, and is based on MIMO (Multiple Inputs and Multiple Outputs) technology, which uses multiple antennas at both the transmitter and receiver ends to minimize transmission errors and optimize data speed. In addition, this standard uses a coding method that transmits multiple duplicate copies to improve data reliability.

[0005] As the proliferation of wireless LANs accelerates and the applications using them diversify, there is a growing need for new wireless LAN systems that can support very high throughput (VHT) higher than the data processing speed supported by IEEE 802.11n. Among these, IEEE 802.11ac supports a wide bandwidth (80MHz to 160MHz) at the 5GHz frequency. Although the IEEE 802.11ac standard is defined only in the 5GHz band, early 11ac chipsets are expected to support operation in the 2.4GHz band for backward compatibility with older 2.4GHz band products. Theoretically, this standard allows for a minimum wireless LAN speed of 1Gbps and a maximum single-link speed of 500Mbps. This is achieved by extending the wireless interface concepts accepted in 802.11n, including wider radio frequency bandwidth (up to 160MHz), more MIMO spatial streams (up to 8), multi-user MIMO, and high-density modulation (up to 256QAM). Another method for transmitting data using the 60GHz band instead of the conventional 24GHz / 5GHz band is IEEE 802.11ad. IEEE 802.11ad is a transmission standard that uses beamforming technology to provide speeds of up to 7Gbps, making it suitable for streaming large amounts of data and high-bitrate video such as uncompressed HD video. However, the 60GHz frequency band has the disadvantage of being difficult to pass through obstacles, limiting its use to devices in short-range spaces.

[0006] Meanwhile, the IEEE 802.11ax (High Efficiency WLAN, HEW) standard has been developed and is nearing completion as a wireless LAN standard for 802.11ac and 802.11ad and beyond, to provide highly efficient and high-performance wireless LAN communication technology in high-density environments where access points (APs) and terminals are densely packed. In an 802.11ax-based wireless LAN environment, it is necessary to provide highly frequency-efficient communication indoors and outdoors in the presence of high-density stations and APs (Access Points), and various technologies have been developed to realize this.

[0007] Furthermore, in order to support new multimedia applications such as high-definition video and real-time games, development has begun on a new wireless LAN standard to increase the maximum transmission speed. The 7th generation wireless LAN standard, IEEE 802.11be (Extremely High Throughput, EHT), is being developed with the goal of supporting a maximum transmission rate of 30 Gbps in the 2.4 / 5 / 6 GHz band through wider bandwidth, increased spatial streams, and multiple AP coordination. [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] As mentioned above, the purpose of this invention is to provide an ultra-high-speed wireless LAN service for new multimedia applications.

[0009] Furthermore, the present invention aims to provide a method and apparatus for transmitting information for receiving PPDU.

[0010] Furthermore, the present invention aims to provide a method for individually encoding / decoding the Resource Unit (RU) assignment subfield that indicates the resource unit to which the PPDU is transmitted.

[0011] The technical problems to be addressed herein are not limited to those mentioned above, and other technical problems not mentioned above will be clearly understood by those with ordinary skill in the art to which the present invention pertains from the following description. [Means for solving the problem]

[0012] A terminal for transmitting a Trigger Based Physical Layer Protocol Data Unit (TB PPDU), which is a response frame, based on a trigger frame in a wireless communication system includes a communication module; a processor that controls the communication module, the processor receiving an EHT PPDU (Physical Layer Protocol Data Unit) from an Access Point (AP) that includes one or more EHT (Extremely High Throughput)-SIG (signal) content channels, each of the one or more EHT-SIG content channels includes a common field containing at least one first resource unit (RU) assignment subfield and a user-specific field, the processor identifies whether the common field further includes at least one second RU assignment subfield, and decodes the PPDU based on whether the common field further includes at least one second RU assignment subfield.

[0013] Furthermore, in the present invention, if the common field further includes the at least one second RU assignment subfield, the at least one first RU assignment subfield and the at least one second RU assignment subfield are each decoded individually.

[0014] Furthermore, in the present invention, if the common field further includes the at least one second RU assignment subfield, each of the one or more EHT-SIG content channels further includes a first CRC (cyclic redundancy check) and a first tail associated with the at least one first RU assignment subfield, and if the common field further includes the at least one second RU assignment subfield, the first CRC and the first tail are located before the at least one second RU assignment subfield, and each of the one or more EHT-SIG content channels further includes a second CRC and a second tail associated with the at least one second RU assignment subfield.

[0015] Furthermore, in the present invention, whether each of the one or more EHT-SIG content channels further includes the at least one second RU assignment subfield is identified based on a specific subfield located before the at least one first RU assignment subfield.

[0016] Furthermore, in the present invention, a specific subfield, the at least one first RU assignment subfield, the first CRC, and the first tail constitute a first encoding block, and the at least one second RU assignment subfield, the second CRC, and the second tail constitute a second encoding block.

[0017] Furthermore, in the present invention, the first encoding block and the second encoding block are decoded individually.

[0018] Furthermore, in the present invention, the one or more EHT-SIG content channels are transmitted at intervals of a certain 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.

[0019] Furthermore, in the present invention, the specific subfield is used to identify the total number of each of the at least one first RU assignment subfield and the at least one second RU assignment subfield.

[0020] The present invention also provides a method for receiving an EHT PPDU (Physical Layer Protocol Data Unit) from an AP (Access Point) that includes one or more EHT (Extremely High Throughput)-SIG (signal) content channels, wherein each of the one or more EHT-SIG content channels includes a common field that includes at least one first resource unit (RU) assignment subfield and a user-specific field; a step of identifying whether the common field further includes at least one second RU assignment subfield; and a step of decoding the PPDU based on whether the common field further includes at least one second RU assignment subfield. [Effects of the Invention]

[0021] According to embodiments of the present invention, ultra-high-speed signaling field information can be efficiently transmitted.

[0022] Furthermore, according to embodiments of the present invention, the overall resource utilization rate in a competitive base channel proximity system can be increased, thereby improving the performance of the wireless LAN system.

[0023] Furthermore, according to embodiments of the present invention, a PPDU can be received and decoded based on the information for transmitting and receiving the PPDU contained within the PPDU.

[0024] Further, according to an embodiment of the present invention, the packet structure of the PPDU can be efficiently configured by individually encoding / decoding the RU allocation subfield that indicates the RU for PPDU transmission.

[0025] The effects obtained from the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those having ordinary knowledge in the technical field to which the present invention pertains from the following description.

Brief Description of Drawings

[0026] [Figure 1] It is a diagram showing a wireless LAN system according to an embodiment of the present invention. [Figure 2] It is a diagram showing a wireless LAN system according to another embodiment of the present invention. [Figure 3] It is a diagram showing the configuration of a station according to an embodiment of the present invention. [Figure 4] It is a diagram showing the configuration of an access point according to an embodiment of the present invention. [Figure 5] It is a diagram schematically showing the process in which the STA sets up a link with the AP. [Figure 6] It is a diagram showing the CSMA (Carrier Sense Multiple Access) / CA (Collision Avoidance) method used in wireless LAN communication. [Figure 7] An example of various standard generation-based PPDU (PLCP Protocol Data Unit) formats is shown. [Figure 8] An example of various EHT (Extremely High Throughput) PPDU formats according to an embodiment of the present invention and a method for indicating the same is shown. [Figure 9] An example of an EHT PPDU format according to an embodiment of the present invention is shown. [Figure 10] An example of a preamble structure according to an embodiment of the present invention is shown. [Figure 11]The configuration of an EHT-SIG field according to one embodiment of the present invention is shown. [Figure 12A] An example of a RU assignment subfield according to one embodiment of the present invention is shown. [Figure 12B] An example of a RU assignment subfield according to one embodiment of the present invention is shown. [Figure 13A] Another example of an RU assignment subfield according to one embodiment of the present invention is shown below. [Figure 13B] Another example of an RU assignment subfield according to one embodiment of the present invention is shown below. [Figure 14] An example of the structure of an EHT-SIG according to one embodiment of the present invention is shown. [Figure 15] Another example of an EHT-SIG structure according to one embodiment of the present invention is shown. [Figure 16] An example of an EHT-SIG structure is shown when the bandwidth of the PPDU according to one embodiment of the present invention is 20 MHz or 40 MHz. [Figure 17] This figure shows the EHT-SIG structure of an 80MHz PPDU according to one embodiment of the present invention. [Figure 18] An example of center 26-tone RU signaling according to one embodiment of the present invention is shown. [Figure 19] Here is yet another example of center 26 tone RU signaling according to one embodiment of the present invention. [Figure 20] Here is yet another example of center 26 tone RU signaling according to one embodiment of the present invention. [Figure 21] Another example of an EHT-SIG structure according to one embodiment of the present invention is shown. [Figure 22] This flowchart shows an example of a method for receiving and decoding PPDU according to one embodiment of the present invention. [Figure 23] This flowchart shows an example of a method for generating and transmitting a PPDU according to one embodiment of the present invention. [Modes for carrying out the invention]

[0027] The terminology used herein has been selected to the greatest extent possible from currently widely used general terms, taking into account the function of the present invention; however, this may differ depending on the intent, conventions, or emergence of new technologies of the articulate persons in the relevant field. In addition, in certain cases, the applicant has arbitrarily selected some terms, and in such cases, the meaning of these terms will be described in the relevant section of the invention description. Therefore, it should be made clear that the terms used herein are not merely names of terms, but should be interpreted based on the substantive meaning of the terms and the content of this specification as a whole.

[0028] Throughout the specification, when one component is described as being "connected" to another, this includes not only cases where they are "directly connected," but also cases where they are "electrically connected" with other components in between. Furthermore, when a component is described as "containing" a particular component, this means, unless otherwise stated, that it may contain other components rather than excluding them. In addition, limitations such as "greater than or equal to" or "less than or equal to" a specific critical value may be appropriately replaced by "greater than" or "less than" depending on the embodiment.

[0029] In the present invention, the terms "field" and "subfield" may be used interchangeably.

[0030] Figure 1 shows a wireless LAN system according to one embodiment of the present invention.

[0031] A wireless LAN system includes one or more Basic Service Sets (BSS), where a BSS represents a set of devices that have successfully synchronized and can communicate with each other. Generally, BSSs are classified into infrastructure BSSs and independent BSSs (IBSSs), and Figure 1 shows an infrastructure BSS.

[0032] As shown in Figure 1, the infrastructure BSS BSS1, BSS2 includes one or more stations STA1, STA2, STA3, STA4, STA5, access points AP-1, AP-2 which are stations that provide distribution services, and a distribution system DS that connects multiple access points AP-1, AP-2.

[0033] A Station (STA) is any device that includes Medium Access Control (MAC) and a Physical Layer interface to a wireless medium in accordance with the IEEE 802.11 standard, and in a broad sense includes not only non-AP stations but also all access points (APs). In this specification, "terminal" is used to refer to non-APs, APs, or both. A station for wireless communication includes a processor and a communication unit, and depending on the embodiment, further includes a user interface unit and a display unit, etc. The processor generates frames to be transmitted over the wireless network or processes frames received over the wireless network, and performs various other processing for controlling the station. The communication unit is functionally connected to the processor and sends and receives frames over the wireless network for the station. In this invention, "terminal" is used as a term that includes user equipment (UE).

[0034] An Access Point (AP) is an individual device that provides connectivity to a distribution system (DS) via a wireless medium for stations associated with it. In infrastructure BSS, communication between non-AP stations is generally conducted via APs, however, direct communication is possible between non-AP stations if a direct link is configured. In this invention, AP is used as a concept that includes PCP (Personal BSS Coordination Point), but in a broader sense, it includes all concepts such as central controllers, base stations (BS), node B, BTS (Base Transceiver System), or site controllers. In this invention, AP is also referred to as a base wireless communication terminal, but in a broader sense, base wireless communication terminal is used as a term that includes APs, base stations, eNBs (eNodeBs), and transmission points (TPs). Furthermore, base wireless communication terminals include various forms of wireless communication terminals that allocate and schedule communication medium resources in communication with multiple wireless communication terminals.

[0035] Multiple infrastructure BSSs are connected to each other via a distribution system DS. In this case, multiple BSSs connected via the distribution system are called an Extended Service Set (ESS).

[0036] Figure 2 shows an independent BSS, which is a wireless LAN system according to another embodiment of the present invention. In the embodiment of Figure 2, redundant explanations are omitted for parts that are the same as or corresponding to the embodiment of Figure 1.

[0037] As shown in Figure 2, BSS3 is an independent BSS and does not include APs, so all stations (STA6, STA7) are not connected to APs. An independent BSS is not allowed to connect to a distribution system and forms a self-contained network. In an independent BSS, each station (STA6, STA7) is directly connected to one another.

[0038] Figure 3 is a block diagram showing the configuration of station 100 according to one embodiment of the present invention. As shown, station 100 according to the embodiment of the present invention includes a processor 110, a communication unit 120, a user interface unit 140, a display unit 150, and a memory 160.

[0039] First, the communication unit 120 transmits and receives wireless signals such as wireless LAN packets and may be incorporated into the station 100 or provided externally. According to one embodiment, the communication unit 120 may include at least one communication module using different frequency bands. For example, the communication unit 120 may include communication modules of different frequency bands such as 2.4GHz, 5GHz, 6GHz, and 60GHz. According to one embodiment, the station 100 may include a communication module using a frequency band of 7.125GHz or higher and a communication module using a frequency band of 7.125GHz or lower. Each communication module can perform wireless communication with an AP or external station based on the wireless LAN standard of the frequency band supported by the communication module. Depending on the performance and requirements of the station 100, the communication unit 120 may operate only one communication module at a time or operate multiple communication modules together simultaneously. When the station 100 includes multiple communication modules, each communication module may be provided in an independent form, or the multiple modules may be integrated as a single chip. In embodiments of the present invention, the communication unit 120 can represent an RF (Radio Frequency) communication module that processes RF signals.

[0040] Next, the user interface 140 includes various forms of input / output means provided in the station 100. In other words, the user interface unit 140 receives user input using various input means, and the processor 110 controls the station 100 based on the received user input. The user interface unit 140 also outputs based on instructions from the processor 110 using various output means.

[0041] Next, the display unit 150 outputs an image to the display screen. The display unit 150 outputs various display objects, such as content generated by the processor 110 or user interfaces based on control instructions from the processor 110. The memory 160 stores control programs used by the station 100 and various data associated with them. Such control programs include connection programs necessary for the station 100 to connect with APs or external stations.

[0042] The processor 110 of the present invention executes various instructions or programs and processes data within the station 100. The processor 110 also controls each unit of the station 100 and controls the transmission and reception of data between units. According to an embodiment of the present invention, the processor 110 executes a program for connection with the AP stored in the memory 160 and receives a communication setup message transmitted by the AP. The processor 110 also reads information regarding the priority conditions of the station 100 contained in the communication setup message and requests a connection to the AP based on the priority conditions of the station 100. The processor 110 of the present invention may refer to the main control unit of the station 100, or, depending on the embodiment, may refer to a control unit for individually controlling a part of the station 100's configuration, such as the communication unit 120. In other words, the processor 110 may be a modem or a modulator and / or demodulator that modulates and demodulates the wireless signals transmitted and received from the communication unit 120. The processor 110 controls various operations of wireless signal transmission and reception of the station 100 according to an embodiment of the present invention. A detailed embodiment relating to this will be described later.

[0043] The station 100 shown in Figure 3 is a block diagram according to one embodiment of the present invention, and the separately shown blocks represent logically distinguished elements of the device. Therefore, the above-mentioned elements of the device are mounted on one chip or multiple chips depending on the device design. For example, the processor 110 and the communication unit 120 may be integrated and implemented on a single chip, or they may be implemented on separate chips. Furthermore, in the embodiment of the present invention, some 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.

[0044] Figure 4 is a block diagram showing the configuration of AP200 according to one embodiment of the present invention. As shown, AP200 according to an embodiment of the present invention includes a processor 210, a communication unit 220, and a memory 260. In Figure 4, redundant explanations are omitted for parts of the AP200 configuration that are the same as or correspond to the configuration of station 100 in Figure 3.

[0045] Referring to Figure 4, the AP 200 according to the present invention includes a communication unit 220 for operating a BSS in at least one frequency band. As described above in the embodiment of Figure 3, the communication unit 220 of the AP 200 can also include a plurality of communication modules using different frequency bands. That is, the AP 200 according to an embodiment of the present invention can include two or more communication modules using different frequency bands, for example, 2.4 GHz, 5 GHz, 6 GHz, and 60 GHz. Preferably, the AP 200 can include a communication module using a frequency band of 7.125 GHz or higher and a communication module using a frequency band of 7.125 GHz or lower. Each communication module can communicate wirelessly with the station based on the wireless LAN standard of the frequency band supported by the communication module. Depending on the performance and requirements of the AP 200, the communication unit 220 can operate only one communication module at a time or operate multiple communication modules together simultaneously. In an embodiment of the present invention, the communication unit 220 can represent an RF (Radio Frequency) communication module that processes RF signals.

[0046] Next, the memory 260 stores the control program used by the AP200 and various data associated with it. Such a control program includes a connection program that manages station connections. The processor 210 controls each unit of the AP200 and controls the transmission and reception of data between units. According to one embodiment of the present invention, the processor 210 executes the program for connecting with stations stored in the memory 260 and transmits a communication setting message to one or more stations. In this case, the communication setting message includes information regarding the connection priority conditions of each station. The processor 210 also performs connection settings in response to connection requests from stations. According to one embodiment, the processor 210 is a modem or modulation / demodulation unit that modulates and demodulates the wireless signals transmitted and received from the communication unit 220. The processor 210 controls various operations of wireless signal transmission and reception of the AP200 according to the embodiment of the present invention. A detailed embodiment relating thereto will be described later.

[0047] Figure 5 is a schematic diagram illustrating the process by which STA establishes a link with AP.

[0048] Referring to Figure 5, the link between STA100 and AP200 is established through three main steps: scanning, authentication, and association. First, the scanning step is the step in which STA100 obtains connection information for the BSS operated by AP200. There are two methods for performing scanning: passive scanning, which obtains information using only the beacon message S101 that AP200 periodically transmits, and active scanning, in which STA100 transmits a probe request S103 to the AP, receives a probe response S105 from the AP, and obtains connection information.

[0049] In the scanning step, STA100, having successfully received wireless connection information, transmits an authentication request (S107a), receives an authentication response from AP200 (S107b), and performs the authentication step. After the authentication step is performed, STA100 transmits an association request (S109a), receives an association response from AP200 (S109b), and performs the association step. In this specification, "association" basically means wireless coupling, but the present invention is not limited to this, and in a broad sense, coupling includes all wireless and wired couplings.

[0050] On the other hand, an additional 802.1X-based authentication step S111 and an IP address acquisition step S113 via DHCP are performed. In Figure 5, Server 300 is a server that processes authentication between STA100 and the 802.1X-based system, and may be physically connected to AP200 or exist as a separate server.

[0051] Figure 6 shows the CSMA (Carrier Sense Multiple Access) / CA (Collision Avoidance) method used in wireless LAN communication.

[0052] A terminal performing wireless LAN communication checks whether a channel is busy or not by performing carrier sensing before transmitting data. If a wireless signal above a certain strength is detected, the 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 the detection of the signal is determined is called the CCA threshold. If a wireless signal above the CCA threshold is received by the terminal and the terminal is the recipient, the terminal processes the received wireless signal. On the other hand, if no wireless signal is detected from the channel, or if a wireless signal below the CCA threshold is detected, the channel is determined to be idle.

[0053] If a channel is determined to be idle, each terminal with data to transmit performs a backoff procedure after a certain period of time, such as an IFS (Inter Frame Space) or PIFS (PCF IFS), depending on the status of each terminal. In this embodiment, the AIFS is used as a replacement for the conventional DIFS (DCF IFS). Each terminal waits, decreasing its slot time by a random number determined for that terminal during the interval of the channel's idle state, and the terminal that has exhausted all of its slot time attempts to access the channel. The period in which each terminal performs this backoff procedure is called the competition window period.

[0054] If a specific terminal successfully accesses the channel, it transmits data through the channel. However, if a terminal attempting access collides with another terminal, the colliding terminals are each assigned a new random number and perform a further backoff procedure. In one embodiment, the random number newly assigned to each terminal is determined within a range twice the range (competition window, CW) of the random number previously assigned to that terminal (2*CW). Meanwhile, each terminal attempts access again in the next competition window interval by performing a further backoff procedure, but this time, each terminal performs the backoff procedure from the slot time remaining in the previous competition window interval. In this way, each terminal performing wireless LAN communication can avoid collisions with each other for a specific channel.

[0055] <Various PPDU Format Examples>

[0056] Figure 7 shows examples of various standard generational PPDU (PLCP Protocol Data Unit) formats. More specifically, Figure 7(a) shows an example of a legacy PPDU format based on 802.11a / g, Figure 7(b) shows an example of an HE PPDU format based on 802.11ax, and Figure 7(c) shows an example of a non-legacy PPDU (i.e., EHT PPDU) format based on 802.11be. Figure 7(d) shows the configuration of the detailed fields of L-SIG and RL-SIG commonly used in these PPDU formats.

[0057] Referring to Figure 7(a), the legacy PPDU preamble includes L-STF (Legacy Short Training field), L-LTF (Legacy Long Training field), and L-SIG (Legacy Signal field). In embodiments of the present invention, the L-STF, L-LTF, and L-SIG can be referred to as the legacy preamble.

[0058] Referring to Figure 7(b), the HE PPDU preamble further includes, in addition to the legacy preamble, RL-SIG (Repeated Legacy Short Training field), HE-SIG-A (High Efficiency Signal A field), HE-SIG-B (High Efficiency Signal B field), HE-STF (High Efficiency Short Training field), and HE-LTF (High Efficiency Long Training field). In embodiments of the present invention, RL-SIG, HE-SIG-A, HE-SIG-B, HE-STF, and HE-LTF can be referred to as the HE preamble. The specific configuration of the HE preamble may be modified according to the HE PPDU format. For example, HE-SIG-B may be used only in the HE MU PPDU format.

[0059] Referring to Figure 7(c), the EHT PPDU preamble further includes, in addition to the legacy preamble, RL-SIG (Repeated Legacy Short Training field), U-SIG (Universal Signal field), EHT-SIG-A (Extremely High Throughput Signal A field), EHT-SIG-A (Extremely High Throughput Signal B field), EHT-STF (Extremely High Throughput Short Training field), and EHT-LTF (Extremely High Throughput Long Training field). In embodiments of the present invention, RL-SIG, EHT-SIG-A, EHT-SIG-B, EHT-STF, and EHT-LTF can be referred to as the EHT preamble. The specific configuration of the non-legacy preamble may be modified depending on the EHT PPDU format. For example, EHT-SIG-A and EHT-SIG-B may be used in only some of the EHT PPDU formats.

[0060] The L-SIG field included in the PPDU preamble is configured with 64FFT OFDM and consists of 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 BPSK and Rate=1 / 2 MCS (Modulation and Coding Scheme) are applied to the L-SIG, it can contain a total of 24 bits of information. Figure 7(d) shows the 24-bit information configuration of the L-SIG.

[0061] Referring to Figure 7(d), the L-SIG includes the L_RATE field and the L_LENGTH field. The L_RATE field consists of 4 bits and indicates the MCS used for data transmission. Specifically, the L_RATE field indicates one of the transmission speeds of 6 / 9 / 12 / 18 / 24 / 36 / 48 / 54 Mbps, which are combinations of modulation schemes such as BPSK / QPSK / 16-QAM / 64-QAM and code rates such as 1 / 2, 2 / 3, and 3 / 4. Combining the information from the L_RATE and L_LENGTH fields allows us to determine the total length of the PPDU. In the non-legacy PPDU format, the L_RATE field is set to the minimum speed of 6 Mbps.

[0062] The L_LENGTH field is measured in bytes, with a total of 12 bits allocated to it, allowing for signals up to 4095. This length can be indicated in combination with the L_RATE field. Legacy and non-legacy terminals may interpret the L_LENGTH field differently.

[0063] First, the method by which a legacy or non-legacy terminal interprets the length of the PPDU using the L_LENGTH field is as follows: When the value of the L_RATE field is set to indicate 6 Mbps, 3 bytes (i.e., 24 bits) may be transmitted during the 4us symbol duration of one 64FFT. Therefore, by adding the 3 bytes corresponding to the SVC field and the Tail field to the L_LENGTH field value and dividing this by the 3 bytes transmitted for one symbol, the number of 64FFT reference symbols after L-SIG is obtained. After multiplying the obtained number of symbols by the 4us symbol duration and adding the 20us required for L-STF, L-LTF, and L-SIG transmissions, the length of the PPDU, i.e., the reception time (RXTIME), is obtained. This can be expressed mathematically as shown in Equation 1 below.

[0064] [Mathematics 1]

number

[0065] At this time,

number

[0066] [Math 2]

number

[0067] Here, TXTIME is the total transmission time that constitutes the PPDU, as shown in Equation 3 below. In this case, TX represents the transmission time of X.

[0068] [Math 3]

number

[0069] Referring to the formula above, the length of the PPDU is calculated based on the rounded-up value of L_LENGTH / 3. Therefore, for any value of k, three different values ​​L_LENGTH = {3k+1, 3k+2, 3(k+1)} represent the same PPDU length.

[0070] Referring to Figure 7(e), the U-SIG (Universal SIG) field continues to exist in EHT PPDUs and subsequent generations of wireless LAN PPDUs, and by including 11be, it plays a role in distinguishing which generation of PPDU it is. The U-SIG is a 64FFT-based OFDM2 symbol and can transmit a total of 52 bits of information. Of these, 43 bits, excluding the 9 bits of CRC / tail, are broadly divided into the VI (Version Independent) field and the VD (Version Dependent) field.

[0071] The VI bit maintains its current bit configuration, allowing current 11be terminals to obtain information about a PPDU through its VI field even when subsequent generations of PPDUs are defined. For this purpose, the VI field consists of the PHY version, UL / DL, BSS color, TXOP, and Reserved fields. The PHY version field is 3 bits long and distinguishes between 11be and subsequent generations of wireless LAN standards by version. For 11be, it has a value of 000b. The UL / DL field distinguishes whether the PPDU is an uplink or downlink PPDU. The BSS color represents the BSS identifier defined in 11ax and has a value of 6 bits or more. The TXOP represents the Transmit Opportunity Duration, which was transmitted in the MAC header. By adding it to the PHY header, the length of the TXOP containing the PPDU can be inferred without decoding the PPDU; it has a value of 7 bits or more.

[0072] The VD field is signaling information useful only for the 11be version of PPDU and may consist of fields common to all PPDU formats, such as the PPDU format and BW, and fields defined differently for each PPDU format. The PPDU format is a numerator that distinguishes between EHT SU (Single User), EHT MU (Multiple User), EHT TB (Trigger-based), EHT ER (Extended Range) PPDU, etc. The BW field broadly signals five basic PPDU BW options of 20, 40, 80, 160 (80+80), and 320 (160+160) MHz (BW that can be expressed in the form of a power of 20*2 can be called a basic BW), and various remaining PPDU BWs composed of preamble puncturing. In addition, after being signaled as 320 MHz, some 80 MHz may be signaled in a punctured form. Furthermore, the punctured and deformed channel configuration may be signaled directly in the BW field, or it may be signaled using both the BW field and fields appearing after the BW field (for example, fields within the EHT-SIG field). If the BW field is 3 bits, a total of 8 BW signalings are possible, so a maximum of 3 puncturing modes can be signaled. If the BW field is 4 bits, a total of 16 BW signalings are possible, so a maximum of 11 puncturing modes can be signaled.

[0073] Fields located after the BW field vary depending on the form and format of the PPDU. MU PPDUs and SU PPDUs may be signaled in the same PPDU format. A field may be located before the EHT-SIG field to distinguish between MU PPDUs and SU PPDUs, and additional signaling may be performed for this purpose. Both SU PPDUs and MU PPDUs include the EHT-SIG field, but some unnecessary fields in the SU PPDU may be compressed. In this case, the information of the compressed fields may be omitted or have a reduced size compared to the original fields included in the MU PPDU. For example, the SU PPDU may have other configurations, such as the common fields of the EHT-SIG being omitted or replaced, or user-specific fields being replaced or reduced to one.

[0074] Alternatively, the SU PPDU may further include a compression field indicating whether or not compression is performed, and some fields (e.g., the RA field) may be omitted depending on the value of the compression field.

[0075] If a portion of the EHT-SIG field of an SU PPDU is compressed, the information contained in the compressed field may be signaled together with the uncompressed field (e.g., a common field). In the case of MU PPDUs, since it is a PPDU format for simultaneous reception by multiple users, the EHT-SIG field must be transmitted after the U-SIG field, and the amount of information signaled may be variable. That is, since multiple MU PPDUs are transmitted to multiple STAs, each STA must know the location of the RU to which the MU PPDU is transmitted, the STA to which each RU is assigned, and whether or not the transmitted MU PPDU was sent to it. Therefore, the AP must transmit the EHT-SIG field including the above information. To this end, the U-SIG field signals information for efficient transmission of the EHT-SIG field, which may be the number of symbols and / or the modulation method (MCS) of the EHT-SIG field. The EHT-SIG field may include size and location information of the RU assigned to each user.

[0076] In the case of an SU PPDU, multiple RUs may be assigned to the STA, and these RUs may be consecutive or discontinuous. When the RUs assigned to the STA are not consecutive, the STA can efficiently receive the SU PPDU only if it recognizes the punctured RU in the middle. Therefore, the AP can transmit the SU PPDU including information about the punctured RUs among the RUs assigned to the STA (e.g., the puncturing pattern of the RUs). In other words, in the case of an SU PPDU, a puncturing mode field, which includes information indicating whether a puncturing mode is applied and the puncturing pattern in bitmap format, may be included in the EHT-SIG field, and the puncturing mode field can signal the form of discontinuous channels appearing within the bandwidth.

[0077] The form of the signaled discontinuous channels is limited and, in combination with the value of the BW field, indicates the BW and discontinuous channel information of the SU PPDU. For example, in the case of an SU PPDU, since it is a PPDU transmitted to only one terminal, the STA can recognize the bandwidth allocated to it by the BW field included in the PPDU, and can recognize the punctured resources within 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 with the remaining resource units except for a specific channel of the punctured resource unit. At this time, the multiple RUs assigned to the STA may consist of different frequency bands or tones.

[0078] The reason only limited forms of discontinuous channel configurations are signaled is to reduce the signaling overhead of the SU PPDU. Since puncturing can be performed on each 20MHz subchannel, when puncturing is performed on a bandwidth with multiple 20MHz subchannels, such as 80, 160, and 320MHz, in the case of 320MHz, the configuration of discontinuous channels (when a configuration where only the edge 20MHz is punctured is also considered discontinuous) must be signaled by representing the usage status of each of the remaining 15 20MHz subchannels excluding the primary channel. Thus, allocating 15 bits to signal the discontinuous channel configuration for single-user transmission can act as an excessively large signaling overhead when considering the low transmission speed of the signaling portion.

[0079] Furthermore, in one embodiment of the present invention, a method is proposed to vary the configuration of the PPDU indicated by the preamble puncturing BW value according to the PPDU format signaled in the PPDU format field. Assuming the length of the BW field is 4 bits, in the case of an EHT SU PPDU or TB PPDU, one additional symbol of EHT-SIG-A may be signaled after U-SIG, or EHT-SIG-A may not be signaled at all. Taking this into consideration, it is necessary to signal all up to 11 puncturing modes through only the BW field of U-SIG. However, in the case of an EHT MU PPDU, EHT-SIG-B is signaled after U-SIG, so up to 11 puncturing modes can be signaled in a different way than in an SU PPDU. In the case of an EHT ER PPDU, the BW field can be set to 1 bit to signal whether the PPDU uses a 20 MHz or 10 MHz bandwidth.

[0080] Figure 7(f) shows the configuration of the Format-specific field in the VD field when EHT MU PPDU is indicated in the U-SIG's PPDU format field. In the case of MU PPDU, SIG-B, which is a signaling field for simultaneous reception by multiple users, is required, and SIG-B may be transmitted after U-SIG without a separate SIG-A. For this purpose, U-SIG must signal information for decoding SIG-B. Such fields include SIG-B MCS, SIG-B DCM, Number of SIG-B Symbols, SIG-B Compression, and Number of EHT-LTF Symbols.

[0081] Figure 8 shows an example of various EHT (Extremely High Throughput) PPDU formats according to embodiments of the present invention and a method for indicating them.

[0082] Referring to Figure 8, a PPDU may consist of a preamble and a data portion, and one type of format, EHT PPDU, may be distinguished by a U-SIG field included in the preamble. Specifically, whether or not the PPDU format is an EHT PPDU may be indicated based on the PPDU format field included in the U-SIG field.

[0083] Figure 8(a) shows an example of an 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 may have an EHT-SIG-A field for additional signaling after the U-SIG field.

[0084] Figure 8(b) shows an example of an EHT trigger-based PPDU format, which is 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 as a response to a trigger frame. Unlike an EHT SU PPDU, an EHT PPDU does not have an EHT-SIG-A field after the U-SIG field.

[0085] Figure 8(c) shows an example of the EHT MU PPDU format, which is 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, the HE-SIG-B field may be located after the U-SIG field.

[0086] Figure 8(d) shows an example of the EHT ER SU PPDU format used for single-user transmissions with STAs in an extended range. EHT ER SU PPDU may be used for single-user transmissions with STAs in a wider range than EHT SU PPDU described in Figure 8(a), and the U-SIG field may be repeatedly positioned on the time axis.

[0087] The EHT MU PPDU described in Figure 8(c) can be used by an AP for downlink transmission to multiple STAs. In this case, the EHT MU PPDU can include scheduling information so that multiple STAs can simultaneously receive PPDUs transmitted from the AP. The EHT MU PPDU can transmit the AID information of the recipient and / or sender of the PPDU transmitted by the user-specific field of EHT-SIG-B to the STAs. Therefore, multiple terminals that receive the EHT MU PPDU can perform spatial reuse operations based on the AID information in the user-specific field included in the preamble of the received PPDU.

[0088] Specifically, the resource unit allocation (RA) field in the HE-SIG-B field included in the HE MU PPDU may contain information about the configuration of resource units (e.g., resource unit division configuration) within a specific bandwidth on the frequency axis (e.g., 20 MHz). That is, the RA field can instruct the STA on the configuration of resource units divided by the bandwidth for transmitting the HE MU PPDU in order to receive the PPDU. Information about the STA allocated (or specified) to each divided resource unit may be included in the user-specific field of EHT-SIG-B and transmitted to the STA. That is, the user-specific field may contain one or more user fields corresponding to each divided resource unit.

[0089] For example, among the multiple divided resource units, the user field corresponding to at least one resource unit used for data transmission may contain the recipient's or sender's AID, while the user fields corresponding to the remaining resource units not used for data transmission may contain a previously set Null STA ID.

[0090] Two or more PPDUs shown in Figure 8 can be specified by a value indicating the same PPDU format. That is, two or more PPDUs can be specified as having the same PPDU format using the same value. For example, EHT SU PPDU and EHT MU PPDU can be specified by the same value using the U-SIG PPDU format subfield. In this case, EHT SU PPDU and EHT MU PPDU may be distinguished by the number of STAs receiving the PPDU. For example, a PPDU received by only one STA may be identified as an EHT SU PPDU, and if the number of STAs is set so that two or more STAs receive it, it may be identified as an EHT MU PPDU. In other words, two or more PPDU formats shown in Figure 8 can be specified using the same subfield value.

[0091] Furthermore, some fields or some information from a field may be omitted from the fields shown in Figure 8, and this case where some fields or some information from a field are omitted can be defined as compression mode (or compressed mode).

[0092] Figure 9 shows an example of an EHT PPDU format according to one embodiment of the present invention.

[0093] Referring to Figure 9, an EHT PPDU can include one or more signaling fields (SIG fields). Specifically, an EHT PPDU can include an L-SIG field, a U-SIG field, an EHT-SIG field, etc., as described in Figures 7 and 8, and the EHT-SIG field can include an EHT-SIG-A field and / or an EHT-SIG-B field.

[0094] An EHT PPDU may consist of a preamble and data, and the preamble may include at least one of L-STF, L-LTF, L-SIG, RL-SIG, U-SIG, EHT-SIG, EHT-STF, and EHT-LTF. Therefore, an EHT preamble may be used to indicate one or more of the fields listed above. The position and order of the fields included in the preamble may be as shown in Figure 9 and the order of the fields mentioned above.

[0095] L-STF, L-LTF, and L-SIG may be fields for legacy compatibility, and RL-SIG and L-SIG may contain the same information. That is, some or all of the bit values ​​of L-SIG may be repeatedly set in RL-SIG, and RL-SIG may be used to distinguish PPDU formats.

[0096] The EHT-SIG can include common fields and user-specific fields, and may contain resource allocation information for sending PPDUs, STA information to identify the STA to which the resources were allocated, and so on. Therefore, an STA receiving a PPDU can determine (or recognize) whether or not resources have been allocated to it based on the EHT-SIG, and how the resources were allocated, such as the location and size of the allocated resources.

[0097] Common fields can include resource unit (RU) allocation information for at least one STA assigned to a Resource Unit (RU). For example, RU allocation information can include information about the size, location, and configuration of the resource assigned to the STA, as well as the number of STAs to which the RU is assigned.

[0098] The user-specific field can contain information for the STA (user) receiving the PPDU to decode the payload (e.g., information about each STA), and can contain information about one or more STAs. Specifically, the user-specific field can contain information about the STA to which the RU is assigned (e.g., STA ID (Station identifier)), in separate fields corresponding to each STA. That is, information corresponding to STA1 (user1), information corresponding to STA2 (user2), information corresponding to STA3 (user3), ..., information corresponding to STA N (user N) may be included consecutively in the user-specific field. In this case, information about each STA may be included in the user field, and user fields containing information about each STA may be included consecutively in the user-specific field.

[0099] An STA receiving a PPDU can determine whether a RU (Request for Receiving) has been assigned to it based on whether the STA ID corresponding to itself is included in the STA ID in the user field contained in the user identification field. In other words, the STA can determine whether a RU has been assigned to it by checking whether the STA ID corresponding to the RU assigned by the RU assignment subfield is its own ID, and can then receive the PPDU with the RU assigned to it.

[0100] Furthermore, the STA information included in the user field may include information regarding the number of space-time streams (NSTS), whether a beamforming steering matrix is ​​applied (beamformed), information regarding the modulation and coding scheme (MCS), information regarding the use of dual carrier modulation (DCM), and information regarding the coding method (e.g., which coding method (e.g., BCC or LDPC) is used). Such information may also be applicable to the STA-ID value.

[0101] When a common field indicates the structure of RUs assigned to each STA and the number of STAs assigned to each RU, user fields included in a user-specific field may be mapped to the RUs indicated by the common field in the order in which they are located. For example, the RU assignment subfield of the common field may assign RU1 to one STA, RU2 to two STAs, and RU3 to one STA, and the user-specific field may sequentially include four user fields (user field 1, user field 2, user field 3, and user field 4). In this case, RU1 may be assigned to the STA corresponding to the STA ID included in user field 1, and RU2 may be assigned to the STAs corresponding to the STA IDs included in user field 2 and user field 3, respectively. Similarly, RU3 may be assigned to the STA corresponding to the STA ID included in user field 4. MIMO may be used when two or more STAs are assigned to a single RU, such as RU2.

[0102] Common fields and user-specific fields may be included sequentially in the EHT-SIG, as shown in Figure 9.

[0103] In the present invention, the terms "field" and "subfield" may be used interchangeably and are not limited to their respective names.

[0104] The EHT PPDU may further include a location indicator subfield, in which case the location indicator subfield may be included in the common field of the EHT-SIG, as shown in Figure 9. The location indicator subfield may be called a header field and may be used to indicate the location and number of RU assignment subfields in the common field.

[0105] Specifically, the location indicator subfield can indicate the location corresponding to the RU assignment subfield. Therefore, the location of the RU indicated by the user field may be determined based on the location indicator subfield as well as the RU assignment subfield. For example, the location indicator subfield can indicate the starting position of the RU indicated by the RU assignment subfield and / or the position of the last assigned RU, and can also indicate the number of RU assignment subfields. In this case, the RU assignment subfield refers to the fields included in the common fields of the EHT-SIG described above.

[0106] A position indicator subfield may consist of multiple bits, each of which may correspond to a fixed-unit band on the frequency axis. For example, each of the multiple bits constituting the position indicator subfield may be mapped to a non-overlapping band. That is, each bit of the position indicator subfield may be mapped to each of the 20MHz subbands, and in this case, each bit may be mapped sequentially according to the frequency order of the 20MHz subbands. In other words, the bits of the position indicator subfield may be mapped sequentially according to the frequency order of bands of a fixed size.

[0107] For example, each bit may be sequentially mapped in frequency order to the following bands: primary 20MHz (P20), secondary 20MHz (S20), the first 20MHz of secondary 40MHz (S40), the second 20MHz of S40, the first 20MHz of secondary 80 (S80), the second 20MHz of S80, the third 20MHz of S80, the fourth 20MHz of S80, the first 20MHz of S160 (S160 can be defined as any band excluding P80 and S80), the second 20MHz of secondary 160MHz (S160), the third 20MHz of S160, the fourth 20MHz of S160, the fifth 20MHz of S160, the sixth 20MHz of S160, the seventh 20MHz of S160, and the eighth 20MHz of S160.

[0108] For example, if a specific bit constituting the position indicator subfield is 1, the RU assignment subfield associated with the band mapped to that specific bit may be included in the common field. Conversely, if a specific bit constituting the position indicator subfield is 0, the RU assignment subfield associated with the band mapped to that specific bit may not be included in the common field. Therefore, the number of RU assignment subfields included in the common field may be determined based on the value of each bit in the position indicator subfield.

[0109] Therefore, the number of RU assignment subfields in a common field may be identified based on a specific field located before the RU assignment subfield.

[0110] The length (or size) of the position indicator subfield may be based on the bandwidth or channel width of the PPDU. In this case, the bandwidth or channel width may be indicated by the bandwidth field contained in the U-SIG field, and may represent the bandwidth or channel width occupied by the PPDU containing the U-SIG field of the bandwidth field.

[0111] For example, the length of the position indicator subfield may be 4 bits, 8 bits, or 16 bits. In this case, the size of the position indicator subfield may be 4, 8, or 16 bits, respectively, when the bandwidth is 80 MHz, 160 MHz, or 320 MHz.

[0112] Furthermore, the length of the position indicator subfield can be based on puncturing information indicated by the U-SIG field. In this case, the puncturing information may be indicated by the bandwidth field of the U-SIG field. For example, when the bandwidth occupied by the PPDU is indicated by the bandwidth field, puncturing information may also be indicated. That is, when the bandwidth of the PPDU is indicated by the bandwidth field, puncturing information indicating whether or not there is puncturing in the indicated bandwidth may also be indicated.

[0113] For example, the position indicator subfield does not have to include bits for punctured channels (bands) that indicate puncturing information, but it can include bits for uncropped channels (bands) that indicate puncturing information. In other words, the position indicator subfield can include bits associated with uncropped channels (bands).

[0114] Furthermore, according to embodiments of the present invention, the length and value of the position indicator subfield may differ depending on the band. For example, the length and value of the position indicator subfield included in the PPDU of P160 and the position indicator subfield included in the PPDU of S160 may be different.

[0115] In other words, depending on the bandwidth of the PPDU, the EHT-SIG field (or EHT-SIG content channel) of the PPDU may be transmitted multiple times within the PPDU's bandwidth, repeating for each bandwidth unit channel (e.g., 20 MHz). In this case, the values ​​of the fields included in the U-SIG field of the PPDU are set to the same value for each bandwidth unit channel, and some of the fields included in the EHT-SIG field are set to the same value, while the remaining fields may be individually set to the same or different values.

[0116] For example, if the PPDU bandwidth is 80 MHz, the EHT-SIG field (or EHT-SIG content channel) may be transmitted in a total of four iterations (or duplicates) in 20 MHz units. In this case, some fields of the EHT-SIG field may be set to the same value for each of the four channels in the 20 MHz unit, while the remaining fields may be set individually to the same or different values. In this case, the position indicator subfield may be set to the same or different values ​​for each 20 MHz channel. That is, the values ​​of some bits or all bits of the position indicator subfield may be set to the same or different values ​​for each of the EHT-SIG fields in each 20 MHz channel. However, the length and value of the position indicator subfield transmitted by the primary 80 and the secondary 80 may be different from each other.

[0117] As shown in Figure 9, the common field included in the EHT-SIG field may include a position indicator subfield, and the position indicator subfield may be located before the RU assignment subfield. For example, the position indicator subfield may be included at the very beginning of the common field.

[0118] Furthermore, the EHT-SIG of the EHT PPDU may include an RU assignment subfield. The RU assignment subfield can indicate the configuration and location of the RUs to be assigned, as described above, and the number of STAs (or users) assigned to each RU. Therefore, the number of user fields included in the user identification field may be determined by the RU assignment subfield. That is, since the user field contains information about the STA to which the RU is assigned, the number of user fields included in the user identification field may be identified by the number of STAs to which the RU is assigned, using the RU assignment subfield.

[0119] The number of RU assignment subfields in an EHT PPDU may be determined based on a specific field. Specifically, the number of RU assignment subfields in an EHT PPDU can be based on the position indicator subfield. For example, the number of RU assignment subfields can be based on the number of 1s in the position indicator subfield. That is, there may be N RU assignment subfields of unit length. Furthermore, N can be based on the position indicator subfield, and in compression mode, N may be 0.

[0120] Therefore, the number and / or location of RU assignment subfields may be identified by location indicator subfields, and the size and value of location indicator subfields may be identified by the bandwidth of the U-SIG field's bandwidth field. That is, the size and value of location indicator subfields may be determined based on the bandwidth field of the U-SIG field, and the number and / or location of RU assignment subfields may be identified by the location indicator subfields. In other words, the number of RU assignment subfields may be determined by the bandwidth field of the U-SIG field.

[0121] The EHT-SIG field may include a CRC (cyclic redundancy code) subfield and a tail subfield. The CRC included in the EHT-SIG field may be calculated for the position indicator subfield and the RU assignment subfield. The tail subfield may be used to complete the trellis of the convolutional decoder. The tail subfield may also be used to flush the convolutional decoder. The receiver or decoder may have to decode the subfield corresponding to the CRC along with the CRC. Therefore, decoding is only possible if the subfield corresponding to the CRC has already been set.

[0122] As mentioned above, common fields included in the EHT-SIG field may include the position indicator subfield, RU assignment subfield, CRC, and tail.

[0123] Figure 10 shows a preamble structure according to one embodiment of the present invention.

[0124] According to one embodiment of the present invention, the U-SIG field or EHT-SIG field can have different values ​​for each unit band. For example, the unit band may be an 80 MHz band or a 160 MHz band. Referring to Figure 10, the EHT-SIG field may differ for each 80 MHz subband. In the embodiment of Figure 10, the bandwidth of the PPDU is 320 MHz, and 80 MHz subbands 1, 2, 3, and 4 each contain EHT-SIG1, 2, 3, and 4, respectively. Furthermore, a PPDU receiver can receive the PPDU by decoding only the U-SIG field and EHT-SIG field at a specific 80 MHz.

[0125] Furthermore, a unit band EHT-SIG field may have multiple content channels (CCs). Different content channels may have different common field values, different RU assignment subfield values, and / or different position indicator subfield values. For example, there may be two content channels. Referring to Figure 10, each EHT-SIG field in the 80 MHz subband may have CC1 and CC2. That is, multiple content channels in an EHT-SIG field may include subfields with the same value between content channels and / or subfields with different values ​​between channels.

[0126] For example, in the common fields of an EHT-SIG content channel, some fields may have the same values ​​across content channels, while the remaining fields (e.g., RU assignment subfield, user-specific subfield, etc.) may have different values ​​across content channels. In this case, the position indicator subfield may have some or all of its bits have the same or different values ​​across content channels depending on its role. For example, if some bits of a position indicator subfield serve the role of a Center 26-tone RU subfield, these bits may have the same value across content channels.

[0127] In this case, the specific subfields that have the same value among each EHT-SIG content channel in the common fields of the EHT-SIG field may be as follows:

[0128] - Spatial Reuse

[0129] - LDPC Extra Symbol Segment

[0130] - GI+LTF size

[0131] - Number of EHT-LTF symbols

[0132] - Pre-FEC padding Factor

[0133] - PE Disambiguity

[0134] Figure 11 shows the configuration of an EHT-SIG field according to one embodiment of the present invention.

[0135] Figure 11 shows the use of the position indicator subfield and RU assignment subfield and the EHT-SIG field configuration as described in Figure 9, and the previously mentioned details may be omitted.

[0136] As mentioned above, each bit in the position indicator subfield may correspond to an already set band. For example, each bit in the position indicator subfield may correspond to a 20MHz subband. In this case, each bit in the position indicator subfield can indicate the 20MHz subband sequentially from the lowest frequency. Figure 11 shows an example for the 320MHz band. Referring to Figure 11, the position indicator subfield may consist of bits labeled B0 to B15. Each bit may correspond to a 20MHz subband, and B0 to B15 can indicate the total 320MHz band.

[0137] Furthermore, the position indicator subfield can indicate the position of the RU to be signaled by the content channel. Alternatively, the position indicator subfield can indicate the position corresponding to the RU assignment subfield to be signaled by the content channel. Referring to Figure 11, content channel 1 can indicate RU1, RU3, and RU4, and content channel 2 can indicate RU2, RU5, RU6, and RU7. The position indicator subfield of content channel 1 indicates the starting position of RU1, RU3, and RU4, and the position indicator subfield of content channel 2 indicates the starting position of RU2, RU5, RU6, and RU7. A value of 1 in the position indicator subfield may indicate the start of the band corresponding to the RU assignment subfield to be signaled. Therefore, to indicate the existence of the RU assignment subfield corresponding to RU3, which is an RU in the bands B2 to B7, B2 in the position indicator subfield of content channel 1 is shown as 1. Also, RU4 may use multiple RUs. RU4 may use both the band corresponding to B8 and the bands corresponding to B10 to B11. To indicate this, you can set the position indicator subfield B8 to 1.

[0138] As explained, the position indicator subfield may indicate the band position corresponding to the RU assignment. The actual RU size may be indicated in the RU assignment subfield.

[0139] Referring to Figure 11, since the location indicator subfield of content channel 1 indicates the location and existence of RU1, RU3, and RU4, there may be RU assignment subfields corresponding to RU1, RU3, and RU4, and the location where these RU assignment subfields exist may be content channel 1. Similarly, since the location indicator subfield of content channel 2 indicates the location and existence of RU2, RU5, RU6, and RU7, there may be RU assignment subfields corresponding to RU2, RU5, RU6, and RU7, and the location where these RU assignment subfields exist may be content channel 2. Furthermore, the RU assignment subfields may exist in the order indicated by the location indicator subfields. That is, a location indicator subfield can indicate the existence of an RU assignment subfield, and for example, if a bit value of 1 in a location indicator subfield indicates the existence of an RU assignment subfield, then bits with a value of 1 in the location indicator subfield may be sequentially mapped to RU assignment subfields. In other words, the first RU assignment subfield corresponds to the first bit that is 1 in the position indicator subfield, and the second RU assignment subfield may correspond to the second bit that is 1 in the position indicator subfield. Referring to Figure 11, in content channel 1, the RU assignment subfield corresponding to B0, which is the first 1 in the position indicator subfield, may appear first, the RU assignment subfield corresponding to B2, which is the second 1 in the position indicator subfield, may appear second, and the RU assignment subfield corresponding to B8, which is the third 1 in the position indicator subfield, may appear third.

[0140] Therefore, the number of bits with a bit value of 1 in the position indicator subfield can indicate the number of RU allocation subfields. Alternatively, a value based on the number of bits with a bit value of 1 in the position indicator subfield can indicate the number of RU allocation subfields. In this case, the length of each RU allocation subfield may be N_RA bits.

[0141] Content channels 1 and 2 shown in Figure 11 may be CC1 and CC2 within the unit band, as shown in Figure 10. Alternatively, content channels 1 and 2 shown in Figure 11 may represent different EHT-SIGs for each unit band, as shown as EHT-SIG1 and EHT-SIG2 in Figure 10.

[0142] By using RU signaling based on position indicator subfields, flexible signaling is possible in any content channel. More specifically, it is possible to signal RUs at any position in any content channel.

[0143] Furthermore, a CRC and a tail may be present after the position indicator subfield and the RU assignment subfield. In this case, the CRC may correspond to the position indicator subfield and the RU assignment subfield. That is, the position indicator subfield, the RU assignment subfield, and the CRC may all be decoded.

[0144] However, according to embodiments of the present invention, the number of RU assignment subfields is variable, and the number of RU assignment subfields is determined based on the position indicator subfield value, which presents a problem in that it is difficult to determine the length of the bit sequence that is decoded together with the CRC. In other words, it can be difficult to determine the lengths of the position indicator subfield and the RU assignment subfield used in the CRC calculation. Alternatively, the STA needs to decode the position indicator subfield together with the CRC in order to check its value, but the length of the RU assignment subfield calculated together with the CRC is unknown, making it difficult for the STA to decode.

[0145] Figures 12A and 12B show an example of an RU assignment subfield according to one embodiment of the present invention.

[0146] Figures 12A and 12B show the possible values ​​and RU configurations of the RU assignment subfield described in Figures 9 to 11. The values ​​26, 52, 106, 78, and 132 shown in Figures 12A and 12B may represent the number of tones used by the RU. Each bit value of the RU assignment subfield may correspond to each value in a specific row in Figures 12A and 12B, and each RU may be assigned to an STA by the configuration (or structure) of the RU in that row.

[0147] Each RU assigned to an STA by the RU assignment subfield may be identified by a user field located after the RU assignment subfield in the common field. That is, when the configuration of the RUs assigned to an STA and the number of STAs using each RU are set by each bit in the RU assignment subfield, each STA assigned to an RU may be identified by a user field included in the user-specific field located after the RU assignment subfield.

[0148] For example, if the RU assignment subfield is set to the values ​​in the first column of Figure 12A (B9:0, B8...B0:0), the structure may be such that nine 26-tone RUs are assigned. In this case, a user field for identifying the STA corresponding to each 26-tone RU may be included in the user identification field.

[0149] In yet another embodiment of the present invention, RUs smaller than 242 tone RUs can be called small RUs or small-size RUs. Also, RUs of 242 tone RUs or larger can be called large RUs or large-size RUs. Figures 12A and 12B show examples of RU assignment values ​​corresponding to small-size RUs, and the RU assignment subfield can also show large-size RUs, as shown in Figures 13A and 13B.

[0150] Figures 13A and 13B show yet another example of an RU assignment subfield according to one embodiment of the present invention.

[0151] Figures 13A and 13B, like Figures 12A and 12B, show the possible values ​​and RU configurations of the RU assignment subfield described in Figures 9 to 11. The values ​​242, 484, 996, 996x2, etc., shown in Figures 13A and 13B may represent the number of tones used by the RU. Additionally, a value in the RU assignment subfield may correspond to a column in Figures 13A and 13B, and an RU with the structure indicated by that column may be assigned to the STA. Furthermore, a user field corresponding to the RU indicated by the RU assignment subfield may exist after the RU assignment subfield. For example, if the RU assignment subfield indicates the value in the first column of Figure 13A (B9:1, B8...B0:00000y3y2y1y0), a 242-tone RU may be assigned. In this case, a user field corresponding to the 242-tone RU may exist afterward. Also, each column shown in Figures 13A and 13B does not need to be further divided by users in OFDMA. In other words, for example, if the RU assignment subfield shows the value in the fifth column of Figures 13A and 13B (B9:1, B8...B0:00100y3y2y1y0), it is indicated as 242 and 484 tones, but both 242 tones and 484 tones may be assigned to the same user. Also, other STAs may be assigned to the same RU using MIMO.

[0152] Furthermore, as one embodiment, RUs smaller than 242 tone RUs can be called small RUs or small-size RUs. Also, RUs of 242 tone RUs or larger can be called large RUs or large-size RUs. Figures 13A and 13B show examples of RU assignment values ​​corresponding to large-size RUs, and the RU assignment subfield can also show small-size RUs, as shown in Figures 12A and 12B.

[0153] Figure 14 shows an EHT-SIG structure according to one embodiment of the present invention.

[0154] The embodiment shown in Figure 14 is a method for solving the problems described in Figure 11, and the same content as described above may be omitted.

[0155] According to embodiments of the present invention, the position indicator subfield may have an EHT-SIG structure that can be decoded independently of the RU assignment subfield. For example, there may be separate CRCs and tails corresponding to the position indicator subfield and the CRC and tail corresponding to the RU assignment subfield. Referring to Figure 14, the EHT-SIG field or common field may include, in order, the position indicator subfield, CRC, tail, RU assignment subfield, CRC, tail. That is, the CRC corresponding to the position indicator subfield may exist before the RU assignment subfield. In other words, the CRC corresponding to the position indicator subfield may correspond to the number of bits of the position indicator subfield (e.g., 4, 8, or 16) from B0 of the EHT-SIG.

[0156] Furthermore, the CRC corresponding to the RU assignment subfield may consist of (number of bits in the RU assignment subfield) * (number of RU assignment subfields) bits from the position indicator subfield, CRC, and the bits after the tail.

[0157] Therefore, the receiver or decoder can first decode the location indicator subfield value together with the subsequent CRC, then determine the number of RU assignment subfields, and decode the RU assignment subfields together with the subsequent CRC. More specifically, the length of the location indicator subfield may be determined based on the bandwidth value indicated by the U-SIG field. That is, as mentioned above, the length of the location indicator subfield may be determined based on the bandwidth of the PPDU indicated by the bandwidth field of the U-SIG field. Therefore, the location indicator subfield may be decoded together with the corresponding CRC. Furthermore, the number of RU assignment subfields may be identified based on the decoded location indicator subfield value, and the RU assignment subfields may be decoded together with the corresponding CRC.

[0158] In yet another embodiment of the present invention, the number of RU assignment subfields may be indicated by a field preceding the EHT-SIG field (e.g., the U-SIG field). In such cases, it is possible to decode the structure as described in Figure 9. That is, even when the CRC is calculated based on the position indicator subfield and the RU assignment subfield, the length of the RU assignment subfield can be determined, and therefore it is possible to decode it. For example, if the number of RU assignment fields can be identified by the bandwidth field of the U-SIG field located before the EHT-SIG, the length of the RU assignment subfield can be determined by the bandwidth field, and therefore the RU assignment field can be decoded even when the CRC is calculated based on the RU assignment subfield.

[0159] However, when flexible signaling is possible through signaling based on position indicator subfields, the number of RU assignment subfields may differ for each subband (e.g., 20MHz band), and indicating all of these in the U-SIG field can result in significant signaling overhead. Therefore, according to one embodiment, it is possible to set the number of RU assignment subfields for each subband to be the same. For example, the U-SIG field can indicate the maximum number of RU assignment subfields that are actually signaled in each subband, and dummy RU assignment subfields can be inserted for subbands with a number smaller than the maximum.

[0160] Furthermore, according to another embodiment, the number of RU assignment subfields indicated by U-SIG can be distributed and included in the same number for each content channel. However, if the number of RU assignment subfields indicated by U-SIG is not divisible by the number of content channels, the number of RU assignment subfields distributed to each content channel may be decomposed so that there is a difference of one or less.

[0161] Figure 15 shows yet another example of an EHT-SIG structure according to one embodiment of the present invention.

[0162] Referring to Figure 15, the common field may be divided into encoding blocks according to the encoding method, and each encoding block may contain an RU assignment subfield. In this case, the number of encoding blocks may be one or more depending on the bandwidth indicated by the bandwidth field of the U-SIG field, and each encoding block may be encoded individually. Therefore, the STA can decode the encoding blocks individually.

[0163] Specifically, the embodiment in Figure 15 is intended to solve the problem described in Figure 11 and may be an extension of the embodiment in Figure 14. Therefore, the same content as described above may be omitted.

[0164] In the embodiment shown in Figure 14, only the position indicator subfield can be used for CRC calculation, and the number of bits in the CRC and tail can be larger than the number of bits in the position indicator subfield. In other words, it can be said that there is high redundancy.

[0165] Therefore, according to the embodiment of the present invention, the position indicator subfield and a set number of RU assignment subfields can be used in the CRC calculation. In addition, a separate CRC may exist for RU assignment subfields other than the set number of RU assignment subfields. Referring to Figure 15, the EHT-SIG field or common field may be divided into a first encoding block and a second encoding block based on the unit of the field to be encoded. In this case, the fields contained in each encoding block are encoded together, and different encoding blocks may be encoded individually. Therefore, an STA receiving the PPDU can decode each encoding block individually by encoding block.

[0166] As shown in Figure 15, the first encoding block may include and encode the position indicator subfield, the already set number of RU assignment subfields (at least one first RU assignment subfield), the CRC (first CRC), and the tail (first tail), and the second encoding block may include and encode the remaining RU assignment subfields (at least one second RU assignment subfield), the CRC (second CRC), and the tail (second tail) in that order. Figure 15 shows the case where the already set number is 1.

[0167] Therefore, the receiver or decoder can sequentially decode each encoding block. Specifically, the receiver or decoder can first decode the position indicator subfield and the already set number of RU assignment subfields contained in the first encoding block, along with the subsequent CRC, and then determine the number N of RU assignment subfields. If N is less than or equal to the already set number, then the RU assignment subfield has already been signaled, and there is no need for any further subsequent RU assignment subfields, CRC, or tail.

[0168] If N is greater than the number already set, there may be an additional (N - (the number already set)) RU assignment subfields, CRC, and tail. Therefore, after decoding the first encoding block, the receiver or decoder can decode the (N - (the number already set)) RU assignment subfields contained in the second encoding block, along with the subsequent CRC.

[0169] If N is 0, then the already signaled RU assignment subfield may be dummy data, and the subsequent RU assignment subfield, CRC, and tail may not exist. Therefore, the receiver can ignore the dummy data, and the subsequent user fields may not exist.

[0170] The instructions are RU1(1 STA), RU2(2 STA), and RU3(1 STA), 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 may correspond to RU1, user field 2 to RU2, user field 3 to RU2, and user field 4 to RU3. Furthermore, if multiple users are assigned to the same RU, such as RU2(2 STA), MIMO may be used.

[0171] In this case, the number of encoding blocks may 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, only one or two RU allocation subfields are needed, so only one encoding block may be included in the common field. In this case, one RU allocation subfield may be included if the indicated bandwidth is 20 or 40 MHz, and two if it is 80 MHz.

[0172] The number of RU allocation subfields by bandwidth, as indicated by the bandwidth field, can be interpreted as the number of RU allocation subfields included in each EHT-SIG content channel.

[0173] In this case, since there is only one encoding block in the common field of the EHT-SIG field, the values ​​of the position indicator subfield and the already set number of RU assignment subfields may be decoded together with the subsequent CRC.

[0174] However, if the bandwidth of the PPDU indicated by the bandwidth field is 160 MHz or greater (for example, 160 MHz or 320 MHz), then three or more RU allocation subfields are required, and therefore two encoding blocks may be included in the common field. In this case, the two encoding blocks, the first encoding block and the second encoding block, are each encoded and / or decoded individually, and therefore each encoding block may contain its own CRC and tail.

[0175] The first encoding block may include a position indicator subfield, at least one RU assignment subfield, CRC, and a tail, as described above, and the second encoding block may include at least one RU assignment subfield, CRC, and a tail.

[0176] In this case, the first encoding block may further include a spatial reuse subfield indicating whether or not spatial reuse is used, a GI+LTF size subfield indicating the GI duration and the size of the EHHT-LTF, a Number of EHT LTF symbols indicating the number of EHT-LTF symbols, an LDPC extra symbol sequence subfield indicating the presence or absence of an LDPC extra symbol sequence, a Pre-FEC Padding Factor subfield indicating pre-FEC padding elements, and a PE Disambiguity subfield indicating PE disambiguity, and these may all be encoded / decoded together.

[0177] Figure 16 shows an example of an EHT-SIG structure when the bandwidth of the PPDU according to one embodiment of the present invention is 20 MHz or 40 MHz. The same explanation as described above for Figure 16 is omitted.

[0178] According to one embodiment of the present invention, a position indicator subfield may not exist based on bandwidth (or channel width). The bandwidth may be the PPDU bandwidth. Alternatively, the bandwidth may be the bandwidth value included in the U-SIG field. For example, if the bandwidth is 20 MHz or 40 MHz, a position indicator subfield may not exist.

[0179] In one embodiment, when the bandwidth is 20 MHz, there may be one RU allocation subfield. Furthermore, the RU allocation subfield may correspond to the 20 MHz band. Therefore, referring to Figure 16, the EHT-SIG field or common field may include one RU allocation subfield, a CRC, and a tail. Furthermore, the CRC may correspond to one RU allocation subfield.

[0180] As one embodiment, when the bandwidth is 40 MHz, there may be two RU assignment subfields across all content channels. Therefore, two content channels may each contain one RU assignment subfield and include the corresponding CRC and tail. In yet another embodiment, when the bandwidth is 40 MHz, each content channel may contain two RU assignment subfields and include the corresponding CRC and tail for both RU assignment subfields. In this case, there is the advantage that RU assignment signaling can be performed more freely compared to including one RU assignment subfield per content channel. Also, when including one RU assignment subfield per content channel, there is the advantage of reduced signaling overhead.

[0181] According to embodiments of the present invention, a position indicator subfield may exist when the bandwidth is 80 MHz or higher.

[0182] Figure 17 shows the EHT-SIG structure of an 80MHz PPDU according to one embodiment of the present invention.

[0183] In the embodiment shown in Figure 17, the same information as described above may be omitted, and the number of RU assignment subfields can be expressed as N_RA.

[0184] According to one embodiment of the present invention, a position indicator subfield can be included when the bandwidth is 80 MHz. The position indicator subfield when the bandwidth is 80 MHz may be the same position indicator subfield as described above.

[0185] For example, the position indicator subfield may be 4 bits, with each bit corresponding to a 20 MHz band. If each bit of the position indicator subfield corresponds to a 20 MHz band in signaling based on the position indicator subfield, each content channel can have up to 4 RU assignment subfields. However, by using multiple content channels, it is possible to limit the number of RU assignment subfields that each content channel may contain in order to reduce the signaling overhead of the EHT-SIG field. With a bandwidth of 80 MHz, all types of RU assignments can be signaled using a maximum of 4 RU assignment subfields across all content channels. Therefore, according to embodiments of the present invention, each content channel can have one or two RU assignment subfields. Also, the number of content channels may be 2. Figure 17(a) shows an example in which two content channels each contain a position indicator subfield (4 bits), one or two RU assignment subfields, a CRC, and a tail. In this case as well, as explained in Figure 11, a problem may arise where the RU assignment subfield length is unknown before checking the position indicator subfield. This problem can be solved by utilizing the embodiments described in Figures 14 and 15.

[0186] However, in the embodiment shown in Figure 17(a), there are only two cases for RU assignment in each content channel: one or two. This is indicated by a 4-bit position indicator subfield. Therefore, to reduce signaling overhead, the number of RU assignment subfields may be indicated by a 1-bit signal. For example, the 1-bit signal may be included in a common field.

[0187] Referring to Figure 17(b), the More RU assignment subfield may be the 1-bit signaling. Thus, each content channel may contain the More RU assignment subfield, one or two RU assignment subfields, a CRC, and a tail. In this case as well, a similar problem may occur where the length of the RU assignment subfield is unknown before checking the position indicator subfield, as described in Figure 11. The problem of not knowing the length of the RU assignment subfield before checking the More RU assignment subfield may occur in Figure 17(b).

[0188] Therefore, to solve this problem, the embodiments described in Figures 14 and 15 can be utilized. In the embodiments of Figures 14 and 15, embodiments using a More RU assignment subfield instead of a position indicator subfield can be implemented. That is, the CRC corresponding to the More RU assignment subfield may exist separately from the CRC for the RU assignment subfield. Alternatively, the More RU assignment subfield and the already set number (1) of RU assignment subfields can be used in the CRC calculation, and if there are further RU assignment subfields, further CRCs and tails may exist. Therefore, it becomes possible to decode the More RU assignment subfield without knowing the number of RU assignment subfields. In yet another embodiment, the More RU assignment subfield may be included in the U-SIG field. For example, the More RU assignment subfield included in the U-SIG field may be a subfield used for other purposes if it is not an 80MHz PPDU. For example, puncturing information or a bandwidth field can be used as the More RU assignment subfield.

[0189] According to the embodiment in Figure 17(c), the position indicator subfield or the More RU assignment subfield does not need to exist. When the bandwidth is 80 MHz, the number of bits in the position indicator subfield or the More RU assignment subfield is less than when using a larger bandwidth, so it is possible to omit these bits and include multiple RU assignment subfields. For example, two RU assignment subfields can be included for each content channel. Therefore, when there are two content channels as in Figure 17(c), a total of four RU assignment subfields can be included to represent all RU assignments. This makes implementation easier compared to decoding the position indicator subfield or the More RU assignment subfield. In yet another embodiment, four RU assignment subfields can be included for each content channel. In this case, the four RU assignment subfields may correspond to each 20 MHz band. That is, it is possible to signal the entire 80 MHz band for each content channel, which has the advantage of providing signaling flexibility.

[0190] In the embodiment shown in Figure 17(a), the role of the position indicator subfield is reduced in the embodiments shown in Figures 17(b) and (c). Therefore, it is necessary to determine the position of the channel (band) corresponding to the RU assignment subfield in Figures 17(b) and (c). For example, each RU assignment subfield may correspond to an already configured channel. For instance, the RU assignment subfield for content channel 1 may correspond to the first 20MHz channel and the third 20MHz channel from the lowest frequency. Similarly, the RU assignment subfield for content channel 2 may correspond to the second 20MHz channel and the fourth 20MHz channel from the lowest frequency. The channels corresponding to the RU assignment subfield of each content channel are not limited to these and may also be other already configured channels.

[0191] Figure 18 shows an example of center 26-tone RU signaling according to one embodiment of the present invention. In the embodiment shown in Figure 18, the details described in Figure 17 and other figures may be omitted.

[0192] According to one embodiment of the present invention, the bandwidth of the PPDU may include a center 26-tone RU. For example, the center 26-tone RU may be a 26-tone RU located in the center of an 80MHz PPDU. Alternatively, the center 26-tone RU may be an RU with subcarrier index [-16:-4, 4:16] when the subcarrier index of the DC tone is set to 0. This may be the index for an 80MHz PPDU. If the PPDU is 160(80+80)MHz, there may be a center 26-tone RU in the center of each 80MHz. That is, there may be two center 26-tone RUs. 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 PPDUs, there may be three and four center 26-tone RUs, respectively.

[0193] According to one embodiment of the present invention, center 26-tone RU signaling may be present when the bandwidth is 20 MHz or 40 MHz.

[0194] According to one embodiment of the present invention, center 26-tone RU signaling may exist when the bandwidth is 80 MHz. Referring to Figure 18, center 26-tone RU signaling may be performed by the center 26-tone RU subfield. According to one embodiment, a center 26-tone RU subfield value of 1 means that a user has been assigned to the center 26-tone RU or that the corresponding user field exists. A center 26-tone RU subfield value of 0 means that a user has not been assigned to the center 26-tone RU and that the user field does not exist. If the center 26-tone RU subfield value is 1, the corresponding user field may exist after the same content channel. In this case, the CRC can be calculated including the center 26-tone RU subfield.

[0195] Referring to Figure 18(a), the center 26 tone RU subfield can be present in all content channels. In this case, the center 26 tone RU can be signaled in any content channel, offering the advantage of signaling flexibility. In this case, a user field for the center 26 tone RU can only exist in content channels where the center 26 tone RU subfield is set to 1. In another embodiment, the center 26 tone RU subfield may exist in all content channels, and its value may be the same. Therefore, regardless of which content channel the receiver views, they can confirm the signaling for the center 26 tone RU.

[0196] Referring to Figure 18(b), it is possible for only one Center 26-tone RU subfield to exist in an already configured content channel. In this case, there is an advantage in that the signaling overhead can be reduced compared to the embodiment in Figure 18(a). The already configured content channel may be content channel 1. Content channel 1 may be the content channel corresponding to the lowest frequency 20MHz channel. Alternatively, content channel 1 may be the content channel corresponding to the P20 channel. Furthermore, if the channel signaled by the already configured 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 subfield can be determined based on the puncturing information contained in the U-SIG field. Also, the user field corresponding to the Center 26-tone RU can be signaled in the content channel where the Center 26-tone RU subfield exists.

[0197] Figure 19 shows yet another example of center 26-tone RU signaling according to one embodiment of the present invention. In the embodiment of Figure 19, the same details as described above may be omitted, and it is also possible to combine and use the embodiments described above.

[0198] According to one embodiment of the present invention, the EHT-SIG signaling in the primary channel and other channels may be different. Alternatively, the center 26-tone RU signaling in the primary channel and other channels may be different. Therefore, the number (or length) of center 26-tone RU subfields in the primary channel may be different from the number (or length) of center 26-tone RU subfields in channels that are not primary channels. The primary channel can mean a primary 80MHz channel or a primary 160MHz channel.

[0199] According to one embodiment of the present invention, the EHT-SIG of the main channel can include signaling for all center 26-tone RUs. For example, the EHT-SIG of the primary 80MHz channel can include signaling for all center 26-tone RUs. That is, when the bandwidth is 160(80+80), 320(160+160), or 240(80+160 or 160+80)MHz, the main channel can include signaling for 2 center 26-tone RUs, 4 center 26-tone RUs, and 3 center 26-tone RUs, respectively. In yet another embodiment, the main channel may be the primary 160MHz channel. By including signaling for all center 26-tone RUs in the main channel, it is possible to obtain signaling flexibility in the main channel. Furthermore, it is possible to distribute the signaling for all center 26-tone RUs to the content channel. For example, signaling for two center 26-tone RUs present at 160(80+80)MHz can be included once in each of the two content channels. Similarly, signaling for four center 26-tone RUs present at 320(160+160)MHz can be included twice in each of the two content channels. Furthermore, signaling for three center 26-tone RUs present at 240(80+160 or 160+80)MHz can be included two times and one time (or one time and two times) in each of the two content channels. Therefore, at 160(80+80)MHz, each content channel can contain one bit of the center 26-tone RU subfield. At 320(160+160)MHz, each content channel can contain two bits of the center 26-tone RU subfield. Furthermore, when the frequency is 240 (80+160 or 160+80) MHz, the two content channels can each contain 2 bits and 1 bit (or 1 bit and 2 bits) of the center 26 tone RU subfield.

[0200] Referring to Figure 19, in the section labeled P80, each content channel contains either one or two bits of the center 26 tone RU subfield.

[0201] In yet another embodiment, each content channel can include signaling for all center 26 tone RUs, as it also has signaling degrees of freedom. Therefore, each content channel can include signaling for 2 bits, 4 bits, and 3 bits of the center 26 tone RU subfield, respectively, when the bandwidth is 160 (80+80), 320 (160+160), and 240 (80+160 or 160+80) MHz.

[0202] Furthermore, there may be cases where static puncturing occurs. Static puncturing means that a specific channel is punctured regardless of which PPDU is transmitted. Also, static puncturing does not have to be dynamic puncturing, which is determined each time a PPDU is transmitted. Also, static puncturing may be determined during the association process. If static puncturing occurs, the Center 26 Tone RU subfield for Center 26 Tone RUs included in or spanning the punctured channel of static puncturing may be set to 0. That is, the user does not need to assign a Center 26 Tone RU. Alternatively, if static puncturing occurs, the Center 26 Tone RU subfield for Center 26 Tone RUs included in or spanning the punctured channel of static puncturing does not need to exist. Therefore, it is possible to determine the presence or absence of a center 26-tone RU subfield, or the number of center 26-tone RU subfields, based on fixed puncturing.

[0203] According to one embodiment of the present invention, there may be an STA that transmits or receives PPDUs on a channel other than the primary channel. This can be called an STA parked on a non-primary channel. By parking the STA on a non-primary channel, it is possible to alleviate situations where the primary channel is busy.

[0204] According to one embodiment of the present invention, any RU can be assigned to an STA parked in a non-primary channel. In this case, the non-primary channel EHT-SIG can include signaling for all center 26 tone RUs. Therefore, the primary channel EHT-SIG and the non-primary channel EHT-SIG may have the same structure, and the aforementioned primary channel center 26 tone RU signaling can be applied to channels other than the primary channel.

[0205] According to yet another embodiment of the present invention, the channels to which an STA parked in a non-primary channel can be assigned may be limited to 80 MHz. For example, the channels to which the EHT-SIG field of a certain channel can be assigned may be limited to the 80 MHz that includes the certain channel. Referring to Figure 19, the range to which the EHT-SIG of each 80 MHz subband can signal may be limited to that 80 MHz subband. In this case, there may be one center 26-tone RU in the 80 MHz subband that is not the primary 80 MHz channel. Thus, the same center 26-tone RU signaling method described in Figure 18 can be applied to channels that are not the primary 80 MHz channel. Referring to Figure 19, the same center 26-tone RU signaling method described in Figure 18(a) can be applied to channels that are not the primary 80 MHz channel. Therefore, in Figure 19, there is one center 26 tone RU signaling in the 80 MHz subband 2 when the PPDU bandwidth is 160, 320, and 240 MHz, and Figure 19 shows an example where the center 26 tone RU is signaled on all content channels.

[0206] According to yet another embodiment of the present invention, the channels to which an STA parked on a non-primary channel can be assigned may be limited to 160 MHz. For example, the channels to which the EHT-SIG field of a certain channel can be assigned may be limited to 160 MHz including the channel in question. Referring to Figure 19, the range to which the EHT-SIG of each 80 MHz subband can signal may be limited to the P160 channel or S160 channel including the 80 MHz subband. In this case, there may be two center 26 tone RUs that the 80 MHz subband that is not the primary 80 MHz channel signals. Therefore, each content channel may include a 2-bit center 26 tone RU subfield if all content channels can signal both center 26 tone RUs. Alternatively, each content channel may include a 1-bit center 26 tone RU subfield if the two center 26 tone RU signalings are assigned separately to the content channels. The EHT-SIG corresponding to 80 MHz subband 2 in Figure 19 may illustrate such a case.

[0207] If the bandwidth is 240MHz, and two 80MHz channels excluding the primary 80MHz channel are designated as non-P80 channel 1 and non-P80 channel 2, then non-P80 channel 1 will signal two center 26 tone RUs as described above, and non-P80 channel 2 will signal the same center 26 tone RU as when the assignable channels are limited to 80MHz.

[0208] Figure 20 shows yet another example of center 26-tone RU signaling according to one embodiment of the present invention. In the embodiment of Figure 20, the same details as described above may be omitted, and it is also possible to combine and use the embodiments described above.

[0209] According to one embodiment of the present invention, all center 26-tone RUs can be signaled by any channel on which the EHT-SIG is signaled. Therefore, the length (or number) of the center 26-tone RU subfield can be determined based on the bandwidth. If the bandwidth is less than 80 MHz, the center 26-tone RU subfield does not need to exist.

[0210] 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 may be 1, 2, 3, or 4 bits, respectively. In one embodiment, when the center 26 tone RU subfield has multiple bits, each bit may be mapped from a lower frequency center 26 tone RU to a higher frequency center 26 tone RU.

[0211] The center 26-tone RU subfield described in Figures 18-20 may be used in CRC calculation together with the RU assignment subfield. Alternatively, the center 26-tone RU subfield described in Figures 18-20 may be used in CRC calculation together with the position indicator subfield and the RU assignment subfield. Alternatively, the center 26-tone RU subfield may not exist as an independent subfield, and some bits of the position indicator subfield may perform that role. That is, some bits of the position indicator subfield can perform center 26-tone RU signaling.

[0212] Figure 21 shows yet another example of an EHT-SIG structure according to one embodiment of the present invention.

[0213] According to one embodiment of the present invention, the EHT-SIG field may include a dummy RU assignment subfield. The dummy RU assignment subfield may be a dummy RU assignment subfield or dummy data as mentioned in the previous embodiment. The dummy RU assignment subfield may also represent one entry from among the possible values ​​of the RU assignment subfield. That is, an RU assignment subfield set to a specific value can be called a dummy RU assignment subfield.

[0214] Furthermore, the length (in bits) of the dummy RU assignment subfield may be the same as the length (in bits) of the RU assignment subfield. Also, multiple dummy RU assignment subfields can exist within a single content channel.

[0215] According to one embodiment of the present invention, a position indicator subfield can indicate the presence of a dummy RU assignment subfield. For example, a position indicator subfield can indicate a dummy RU assignment subfield in the same way that a position indicator subfield indicates an RU assignment subfield. That is, any bit of the position indicator subfield that is 1 can indicate an RU assignment subfield or a dummy RU assignment subfield. Furthermore, bits of the position indicator subfield that are 1 may be mapped sequentially to subsequent RU assignment subfields or dummy RU assignment subfields. Therefore, the number of bits of the position indicator subfield that are 1 may be the same as the sum of the number of RU assignment subfields and the number of dummy RU assignment subfields. Also, a dummy RU assignment subfield may be located at any position relative to an RU assignment subfield.

[0216] Figure 21 may show the structure of the common fields in the EHT-SIG field. Referring to Figure 21, the EHT-SIG field may include a position indicator subfield, an RU assignment subfield, a dummy RU assignment subfield, a center 26-tone RU subfield, a CRC, and a tail. In this case, the RU assignment subfield may include multiple subfields, as described in Figures 14 to 16.

[0217] Here, multiple RU assignment subfields are illustrated as a single RU assignment subfield. A dummy RU assignment subfield is illustrated as a hatched area. Referring to Figure 21, a dummy RU assignment subfield may exist in content channel 1. A position indicator subfield can indicate the presence and location of the dummy RU assignment subfield. Figure 21 shows an embodiment where the dummy RU assignment subfield is located before the RU assignment subfield.

[0218] According to one embodiment, the dummy RU assignment subfield does not need to specify the RU configuration or assignment. Furthermore, the dummy RU assignment subfield is unrelated to the number of tones and / or bandwidth and can mean that there is no corresponding user or no RU to assign. Therefore, a user field corresponding to the dummy RU assignment subfield does not need to exist.

[0219] Therefore, when a receiver interprets the EHT-SIG, the bits in the dummy RU assignment subfield and the position indicator subfield corresponding to the dummy RU assignment subfield can be ignored. For example, if the position indicator subfield is set to 11001000 (B0B1..B7), there may be a total of three RU assignment subfields and dummy RU assignment subfields. If the order is RU assignment subfield 1, dummy RU assignment subfield, and RU assignment subfield 2, then RU assignment subfield 1 may correspond to B0, the dummy RU assignment subfield to B1, and RU assignment subfield 2 to B4. Therefore, RU assignment subfield 2 may be RU assignment information for the frequency position corresponding to B4. In addition, the user field may be followed by a user field corresponding to RU assignment subfield 2 after the user field corresponding to RU assignment subfield 1. There does not need to be a user field corresponding to a dummy RU assignment subfield.

[0220] In another embodiment, when a location indicator subfield exists in multiple content channels, the existence and number of dummy RU assignment subfields can be determined based on the number of RU assignment subfields indicated by the location indicator subfield in each content channel. For example, if the number of RU assignment subfields indicated by the location indicator subfield in content channel 1 is N1, the number of RU assignment subfields indicated by the location indicator subfield in content channel 2 is N2, ..., and the number of RU assignment subfields indicated by the location indicator subfield in content channel n is Nn, then the existence and number of dummy RU assignment subfields can be determined based on N1, N2, ..., Nn. More specifically, the existence and number of dummy RU assignment subfields can be determined based on the maximum value among N1, N2, ..., Nn. For example, the number of RU assignment subfields in content channel m may be ((maximum value among N1, N2, ..., Nn) - Nm). Therefore, the values ​​of the number of RU assignment subfields and the number of dummy RU assignment subfields in each content channel may be constant. At this point, the position of the dummy RU assignment subfield may already be set. For example, the position of the dummy RU assignment subfield may be after the RU assignment subfield and before the center 26 tone RU subfield.

[0221] By using a dummy RU assignment subfield, the length of the field can be adjusted for each channel. For example, the beginning and end of the RU assignment subfield and the dummy RU assignment subfield can be adjusted to be the same for each channel. Referring to Figure 21, the length of the RU assignment subfield in content channel 2 is longer than the length of the RU assignment subfield in content channel 1, but by including a dummy RU assignment subfield in content channel 1, the sum of the lengths of the RU assignment subfield in content channel 1 and the dummy RU assignment subfield can be the same as the length of the RU assignment subfield in content channel 2. This has the advantage of making it easier to implement when generating and decoding EHT-SIG.

[0222] Figure 22 is a flowchart showing an example of a PPDU receiving and decoding method according to one embodiment of the present invention.

[0223] Referring to Figure 22, a non-AP (Access Point) STA (Station) can receive a PPDU preamble from the AP (S22010). The PPDU preamble may have the same structure as described in Figures 14 to 16. For example, the PPDU may be an EHT PPDU, and the EHT PPDU may be an SU PPDU or an MU PPDU.

[0224] As illustrated in Figure 15, the PPDU preamble may include an EHT-SIG field containing one or more EHT SIG content channels, each of which may contain a common field and a user-specific field.

[0225] The common field may include a specific field (e.g., a location indicator subfield), at least one first resource unit (RU) assignment subfield, a first CRC, and a first tail, and may further include at least one second resource unit assignment subfield, a second CRC, and a second tail depending on certain conditions.

[0226] In this case, a specific field (e.g., a location indicator subfield), at least one first resource unit (RU) assignment subfield, a first CRC, and a first tail can constitute a first encoding block, and at least one second resource unit assignment subfield, a second CRC, and a second tail can constitute a second encoding block.

[0227] In this case, the first encoding block may further include a spatial reuse subfield indicating whether or not spatial reuse is performed, a GI+LTF size subfield indicating the GI duration and the size of the EHHT-LTF, an EHT LTF symbol count field indicating the number of EHT-LTF symbols, an LDPC extra symbol sequence subfield indicating the presence or absence of an LDPC extra symbol sequence, a Pre-FEC padding element subfield indicating pre-FEC padding elements, and a PE disambiguity subfield indicating PE disambiguity.

[0228] In this case, the second encoding block does not need to be included by the bandwidth of the PPDU indicated by the bandwidth field of the U-SIG field, as described above.

[0229] Subsequently, the STA can identify the packet structure of the received preamble (S22020). That is, the STA can identify the format of the received PPDU preamble.

[0230] For example, STA can determine whether a common field further includes at least one second RU assignment subfield. That is, STA can determine whether a common field includes a second encoding block in addition to the first encoding block.

[0231] Specifically, the STA can determine whether at least one second RU assignment subfield is included based on a specific field located before at least one first RU assignment subfield. For example, the size and value of the location indicator subfield may 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 assignment subfields may be identified based on the location indicator subfield. Based on this, the STA can determine whether the second RU assignment subfield is included, and furthermore, whether the second encoding block is included in the common field.

[0232] In other words, the bandwidth indicated based on the U-SIG bandwidth field can determine (or identify) whether at least one second RU allocation subfield is included in the common field.

[0233] Furthermore, as mentioned above, one or more EHT-SIG content channels may have the same values ​​for some of the common fields, while the remaining fields may be set to different values ​​individually.

[0234] For example, some or all bits of a specific field (e.g., a position indicator subfield) may be set to the same value across content channels. Fields that can be set to the same value include some bits of the position indicator subfield, the space reuse subfield, the GI+LTF size subfield, the EHT LTF symbol count field, the LDPC extra symbol sequence subfield, the Pre-FEC padding element subfield, and the PE ambiguity subfield.

[0235] Furthermore, as mentioned above, each encoding block may be encoded / decoded individually. That is, at least one first RU allocation subfield and at least one second RU allocation subfield may be encoded / decoded individually.

[0236] As described above, an STA that has identified the packet configuration can perform decoding based on the identified packet configuration (for example, whether or not it contains a second encoding block and / or at least one second RU allocation subfield) (S22030).

[0237] Subsequently, the STA can receive the PPDU data based on the decoded preamble; that is, it can receive the PPDU data at the RU assigned by the preamble.

[0238] Figure 23 is a flowchart showing an example of a method for generating and transmitting a PPDU according to one embodiment of the present invention.

[0239] Specifically, the AP can generate a PPDU to send to at least one STA (S23010). In this case, the PPDU may consist of a preamble and data.

[0240] The preamble of the PPDU may have the same structure as those described in Figures 14 to 16. For example, the PPDU may be an EHT PPDU, and the EHT PPDU may be an SU PPDU or an MU PPDU.

[0241] As illustrated in Figure 15, the PPDU preamble may include an EHT-SIG field containing one or more EHT SIG content channels, each of which may contain a common field and a user-specific field.

[0242] The common field may include a specific field (e.g., a location indicator subfield), at least one first resource unit (RU) assignment subfield, a first CRC, and a first tail, and may further include at least one second resource unit assignment subfield, a second CRC, and a second tail depending on certain conditions.

[0243] In this case, a specific field (e.g., a location indicator subfield), at least one first resource unit (RU) assignment subfield, a first CRC, and a first tail can constitute a first encoding block, and at least one second resource unit assignment subfield, a second CRC, and a second tail can constitute a second encoding block.

[0244] In this case, the first encoding block may further include, as described above, a spatial reuse subfield indicating whether or not spatial reuse is performed, a GI+LTF size subfield indicating the GI duration and the size of the EHHT-LTF, an EHT LTF symbol count field indicating the number of EHT-LTF symbols, an LDPC extra symbol sequence subfield indicating the presence or absence of an LDPC extra symbol sequence, a Pre-FEC padding element subfield indicating pre-FEC padding elements, and a PE disambiguity subfield indicating PE disambiguity.

[0245] In this case, the second encoding block does not need to be included by the bandwidth of the PPDU indicated by the bandwidth field of the U-SIG field, as described above.

[0246] Specifically, whether or not at least one second RU assignment subfield is included may be identified based on a specific field located before at least one first RU assignment subfield. For example, the size and value of the location indicator subfield may 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 assignment subfields may be identified based on the location indicator subfield. Therefore, whether or not a second RU assignment subfield is included, and furthermore, whether or not a second encoding block is included in the common field, may be identified based on the bandwidth of the PPDU.

[0247] In other words, the bandwidth indicated based on the U-SIG bandwidth field may determine (or identify) whether at least one second RU allocation subfield is included in the common field.

[0248] Furthermore, as mentioned above, one or more EHT-SIG content channels may have the same values ​​for some of the common fields, while the remaining fields may be set to different values ​​individually.

[0249] For example, some or all bits of a specific field (e.g., a position indicator subfield) may be set to the same value across content channels. Fields that can be set to the same value include some bits of the position indicator subfield, the space reuse subfield, the GI+LTF size subfield, the EHT LTF symbol count field, the LDPC extra symbol sequence subfield, the Pre-FEC padding element subfield, and the PE ambiguity subfield.

[0250] Furthermore, as mentioned above, each encoding block may be encoded / decoded individually. That is, at least one first RU allocation subfield and at least one second RU allocation subfield may be encoded / decoded individually.

[0251] Subsequently, the AP can send the generated PPDU to at least one STA in each RU (S23020).

[0252] The above description of the present invention is illustrative, and a person with ordinary skill in the art to which the invention pertains will understand that it can be easily modified into other specific forms without altering the technical idea or essential features of the invention. Accordingly, the embodiments described above should be understood in all respects as illustrative and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined manner.

[0253] The scope of the present invention is indicated more by the claims described below than by the detailed description above, and any modifications or alterations derived from the meaning and scope of the claims and the concept of equivalents thereof should be interpreted as being included within the scope of the present invention. [Explanation of Symbols]

[0254] 100 stations 110 processors 120 Communications Department 140 User Interface Section 150 display units 160 memory

Claims

1. A terminal configured to operate in a wireless communication system, Communication module and Includes a processor configured to control the aforementioned communication module, The aforementioned processor, Receiving an EHT Physical Layer Protocol Data Unit (EHT PPDU) containing one or more EHT-SIG (Extremely High Throughput-Signal) content channels from an access point (AP), Each of the one or more EHT-SIG content channels includes a common field which includes a user-specific field and at least one first resource unit (RU) assignment subfield. The specific fields included in the EHT PPDU are used to identify whether the common field further includes at least one second RU assignment subfield after the at least one first RU assignment subfield, and to receive, Decoding the common field included in the EHT PPDU, The common field includes (i) a first coding block in which the at least one first RU assignment subfield is encoded, and (ii) a second coding block in which the at least one second RU assignment subfield is encoded, if the common field further includes the at least one second RU assignment subfield. The aforementioned specific field relates to the bandwidth over which the EHT PPDU is transmitted. The one or more EHT-SIG content channels are transmitted in fixed subchannel increments according to the bandwidth, and the terminal is configured to perform the decoding and other operations.

2. When the EHT PPDU includes two or more EHT-SIG content channels, the value indicated by the specific field is common to the two or more EHT-SIG content channels of the EHT PPDU. The terminal according to claim 1, wherein each of the first coding block and the second coding block is decoded individually.

3. The at least one first RU assignment subfield is encoded in the first coding block together with the first cyclic redundancy code (CRC) and the first tail. The terminal according to claim 1, wherein the at least one second RU assignment subfield is encoded in 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 located before the at least one first RU assignment subfield.

5. The terminal according to claim 1, wherein the specified field is used to identify the number of at least one first RU assignment subfields, whether or not the at least one second RU assignment subfield is included in the common field, and the number of at least one second RU assignment subfields.

6. A method for receiving data by a terminal configured to operate in a wireless communication system, The step of receiving an EHT physical layer protocol data unit (EHT PPDU) containing one or more EHT-SIG (Extremely High Throughput-Signal) content channels from an access point (AP), Each of the one or more EHT-SIG content channels includes a common field which includes a user-specific field and at least one first resource unit (RU) assignment subfield. The specific fields included in the EHT PPDU are used to identify whether the common field further includes at least one second RU assignment subfield after the at least one first RU assignment subfield, and the steps are as follows: The step of decoding the common field included in the EHT PPDU, The common field includes (i) a first coding block in which the at least one first RU assignment subfield is encoded, and (ii) a second coding block in which the at least one second RU assignment subfield is encoded, if the common field further includes the at least one second RU assignment subfield. The aforementioned specific field relates to the bandwidth over which the EHT PPDU is transmitted. A method comprising the steps of transmitting one or more EHT-SIG content channels in increments of a certain number of subchannels according to the bandwidth.

7. When the EHT PPDU includes two or more EHT-SIG content channels, the value indicated by the specific field is common to the two or more EHT-SIG content channels of the EHT PPDU. The method according to claim 6, wherein the first coding block and the second coding block are each decoded individually.

8. The at least one first RU assignment subfield is encoded in the first coding block together with the first cyclic redundancy code (CRC) and the first tail. The method according to claim 6, wherein the at least one second RU assignment subfield is encoded in the second coding block together with the second CRC and the second tail.

9. The method according to claim 6, wherein the specific field is located before the at least one first RU assignment subfield.

10. The method according to claim 6, wherein the specific field is used to identify the number of at least one first RU assignment subfields, whether or not the at least one second RU assignment subfield is included in the common field, and the number of at least one second RU assignment subfields.

11. An access point (AP) configured to operate in a wireless communication system, Communication module and Includes a processor configured to control the aforementioned communication module, The aforementioned processor, To generate an EHT Physical Layer Protocol Data Unit (EHT PPDU) that includes one or more EHT-SIG (Extremely High Throughput-Signal) content channels, Each of the one or more EHT-SIG content channels includes a common field which includes a user-specific field and at least one first resource unit (RU) assignment subfield. The specific fields included in the EHT PPDU are used to identify whether the common field further includes at least one second RU assignment subfield after the at least one first RU assignment subfield. The common field includes (i) a first coding block in which the at least one first RU assignment subfield is encoded, and (ii) if the common field further includes the at least one second RU assignment subfield, a second coding block in which the at least one second RU assignment subfield is encoded. Transmitting the aforementioned EHT PPDU, The aforementioned specific field relates to the bandwidth over which the EHT PPDU is transmitted. AP configured to transmit and transmit, with one or more EHT-SIG content channels transmitted in fixed subchannel increments according to the bandwidth.

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