Signaling method using resource allocation in a wireless communication system and wireless communication terminal

Abstract

A method for a terminal receiving data in a wireless communication system is provided. The terminal receives a physical layer protocol data unit (PPDU) from an access point (AP) and decodes the received PPDU. The PPDU includes a universal signal (U-SIG) field and an extremely high throughput (EHT)-SIG field including at least one content channel, and the U-SIG field may include a bandwidth field indicating an overall bandwidth over which the PPDU is transmitted. The overall bandwidth is divided into at least one segment. When the at least one content channel includes a first content channel and a second content channel, at least one field among identical fields between the first content channel and the second content channel within the same segment, except for a resource unit allocation (RU allocation) field, may contain identical information.

Description

[Technical field]

[0001] The present invention relates to wireless communication systems, and more particularly to a method and apparatus for transmitting information for allocating discontinuous channels in a wireless communication system. [Background technology]

[0002] Recently, as the use of mobile devices has become more widespread, wireless LAN technology that can provide them with high-speed wireless Internet services has been attracting attention. Wireless LAN technology is a technology that enables mobile devices such as smartphones, smart pads, laptop PCs, portable multimedia players, embedded devices, etc. to wirelessly connect to the Internet at home, in business, or in specific service areas based on short-distance wireless communication technology.

[0003] Since IEEE (Institute of Electronics Engineers) 802.11 supported the initial wireless LAN technology using the 2.4GHz frequency band, it has put into practical use or is currently developing various technology standards. First, IEEE 802.11b uses the 2.4GHz frequency band and supports a maximum communication speed of 11Mbps. IEEE 802.11a, which was commercialized after IEEE 802.11b, uses the 5GHz frequency band instead of the 2.4GHz band, reducing the impact of interference compared to the significantly more congested 2.4GHz frequency band, and uses OFDM technology to increase communication speeds to a maximum of 54Mbps. However, IEEE 802.11a has the disadvantage of a shorter communication distance than IEEE 802.11b. IEEE 802.11g, like IEEE 802.11b, uses the 2.4GHz band and achieves a maximum transmission speed of 54Mbps and satisfies backward compatibility, which has attracted considerable attention, but it also has an advantage over IEEE 802.11a in communication distance.

[0004] IEEE 802.11n is a technical standard established to overcome the communication speed limitations that have been pointed out as a weakness of wireless LAN. The purpose of IEEE 802.11n is to increase the speed and reliability of the network and to extend the operating distance of the wireless network. In detail, IEEE 802.11n supports a high throughput (HT) of up to 540Mbps or more in data processing speed, and is based on MIMO (Multiple Inputs and Multiple Outputs) technology that uses multiple antennas on both the transmitting and receiving ends to minimize transmission errors and optimize data speed. This standard also uses a coding method that transmits multiple duplicate copies to increase data reliability.

[0005] As the use of wireless LANs becomes more widespread and applications using them become more diverse, the need for new wireless LAN systems to support data throughput rates (Very High Throughput, VHT) higher than those supported by IEEE 802.11n is emerging. Among them, IEEE 802.11ac supports wide bandwidth (80MHz~160MHz) at 5GHz frequency. Although the IEEE 802.11ac standard is defined only in the 5GHz band, it is expected that initial 11ac chipsets will also support operation in the 2.4GHz band for backward compatibility with existing 2.4GHz band products. Theoretically, this standard allows multi-station wireless LAN speeds of at least 1Gbps and maximum single link speeds of at least 500Mbps. This is done by extending the air interface concepts accepted by 802.11n, such as wider radio frequency bandwidth (up to 160MHz), more MIMO spatial streams (up to 8), multi-user MIMO, and high density modulation (up to 256QAM). Also, there is IEEE 802.11ad, a method of transmitting data using the 60GHz band instead of the conventional 24GHz / 5GHz. IEEE 802.11ad is a transmission standard that uses beamforming technology to provide speeds of up to 7Gbps, and is suitable for streaming large amounts of data and high bitrate videos such as uncompressed HD video. However, the 60GHz frequency band has the disadvantage that it is difficult to pass through obstacles and can only be used between devices in close proximity.

[0006] Meanwhile, the IEEE 802.11ax (High Efficiency WLAN, HEW) standard is being developed and is in the final stages as the WLAN standard after 802.11ac and 802.11ad to provide high-efficiency and high-performance WLAN communication technology in high-density environments where APs and terminals are densely packed. In an 802.11ax-based WLAN environment, it is necessary to provide high-frequency efficient communication indoors / outdoors in the presence of high density stations and APs (Access Points), and various technologies are being developed to realize this.

[0007] In addition, new WLAN standards have begun to be developed to increase maximum transmission speeds to support new multimedia applications such as high-definition video and real-time games. IEEE 802.11be (Extremely High Throughput, EHT), the 7th generation WLAN standard, is currently being developed with the goal of supporting transmission rates of up to 30Gbps in the 2.4 / 5 / 6GHz bands through wider bandwidth, increased spatial streams, and multiple AP cooperation. Summary of the Invention [Problem to be solved by the invention]

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

[0009] Another object of the present invention is to provide a resource allocation method and apparatus for allocating discontinuous channels to a terminal in resource allocation for the terminal.

[0010] Another object of the present invention is to provide a data format for providing information for a terminal to recognize discontinuously allocated resources when resources are allocated to a plurality of terminals.

[0011] The technical problem to be achieved in this specification is not limited to the technical problem mentioned above, and other technical problems not mentioned will be clearly understood by a person having ordinary skill in the art to which the present invention pertains from the following description. [Means for solving the problem]

[0012] In a wireless communication system, a terminal transmitting an uplink shared channel (PUSCH) to a base station receives a physical layer protocol data unit (PPDU) from an access point (AP) and decodes the received PPDU, the PPDU including a universal signal (U-SIG) field and an extremely high throughput (EHT)-SIG field including at least one content channel, the PPDU being transmitted to a plurality of terminals by a multi-user (MU) transmission operation by the AP, the U-SIG field including a bandwidth field indicating an overall bandwidth in which the PPDU is transmitted, the overall bandwidth being divided into at least one segment, and when the at least one content channel is composed of a first content channel and a second content channel, at least one field among identical fields between the first content channel and the second content channel in the same segment among the at least one segment, except for a resource unit allocation (RU Allocation) field, includes identical information.

[0013] In addition, in the present invention, the at least one field includes at least one of a Low Density Parity Check Code (LDPC) Extra Symbol Segment field, a space-time block coding (STBC) field, a Pre-FEC Padding Factor field, or a GI+LTF (long training field) size field.

[0014] In addition, in the present invention, the at least one segment is composed of a first segment and a second segment, and each of the first content channel and the second content channel is repeatedly transmitted for a certain frequency band within the first segment or the second segment.

[0015] Also, in the present invention, at least one content channel transmitted in the first segment and at least one content channel transmitted in the second segment having the same index include different information from each other.

[0016] Furthermore, in the present invention, when a first content channel and a second content channel are transmitted in the first segment and a first content channel and a second content channel are transmitted in the second segment, the first content channel and the second content channel transmitted in the first segment and the first content channel and the second content channel transmitted in the second segment are repeatedly transmitted at a constant frequency interval.

[0017] Furthermore, in the present invention, the first content channel and the second content channel transmitted in the first segment include a first common field including at least one field including the same value, and the first content channel and the second content channel transmitted in the second segment include a second common field including at least one field including the same value.

[0018] In addition, in the present invention, the at least one field included in the first common field and the at least one field included in the second common field include different information from each other.

[0019] In addition, in the present invention, the U-SIG field and / or the EHT-SIG field of the PPDU transmitted in the first segment has a different value from the U-SIG field and / or the EHT-SIG field of the PPDU transmitted in the second segment.

[0020] In addition, in the present invention, the PPDU further includes puncturing information indicating a puncturing pattern of at least one resource unit allocated to the terminal.

[0021] In addition, in the present invention, the at least one resource unit is recognized by the terminal based on a combination of at least one of the puncturing information, a resource unit allocation field, and a STA ID (station identifier) ​​field, the resource unit allocation field indicating a configuration of the resource unit from which the PPDU is transmitted, and the STA ID field indicating an ID of a terminal to which each resource unit is allocated according to the configuration of the resource unit.

[0022] In addition, in the present invention, when a plurality of resource units are allocated to the terminal, the plurality of resource units may be composed of the same or different numbers of tones, and the plurality of resource units may be allocated discontinuously.

[0023] In addition, in the present invention, the EHT-SIG field includes a common field, and the U-SIG field includes a specific field related to whether the EHT-SIG field includes a resource unit allocation field for allocating resource units.

[0024] Also, in the present invention, when the specific field indicates the application of non-OFDMA, the resource unit allocation field is not included in the EHT-SIG.

[0025] The present invention also provides a method for transmitting a Physical layer Protocol Data Unit (PPDU) from an Access point (AP), the method including: receiving a Physical layer Protocol Data Unit (PPDU) from an Access point (AP); and decoding the received PPDU, the PPDU including a Universal Signal (U-SIG) field and an Extremely High Throughput (EHT)-SIG field including at least one content channel, the PPDU being transmitted to a plurality of terminals by a Multi-user (MU) transmission operation by the AP, the U-SIG field including a bandwidth field indicating an overall bandwidth in which the PPDU is transmitted, the overall bandwidth being divided into at least one segment, and when the at least one content channel is composed of a first content channel and a second content channel, at least one field among identical fields except for a Resource Unit Allocation (RU Allocation) field between the first content channel and the second content channel within the same segment of the at least one segment includes identical information. Effect of the Invention

[0026] According to an embodiment of the present invention, discontinuous channel allocation information may be efficiently signaled.

[0027] According to an embodiment of the present invention, it is possible to increase the overall resource utilization rate in a contention-based channel access system and improve the performance of a WLAN system.

[0028] According to the embodiment of the present invention, by informing a terminal of information for recognizing discontinuously allocated resources, the terminal can efficiently recognize the allocated resources and receive data.

[0029] In addition, according to an embodiment of the present invention, when transmitting data to multiple terminals, information common to each terminal can be transmitted using the same packet format, thereby reducing signaling overhead.

[0030] The effects obtained from the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those having ordinary skill in the art to which the present invention pertains from the following description. [Brief description of the drawings]

[0031] [Figure 1] FIG. 1 is a diagram showing a wireless LAN system according to an embodiment of the present invention. [Diagram 2] FIG. 11 is a diagram showing a wireless LAN system according to another embodiment of the present invention. [Diagram 3] FIG. 2 is a diagram showing a configuration of a station according to an embodiment of the present invention. [Figure 4] FIG. 2 is a diagram showing the configuration of an access point according to an embodiment of the present invention. [Diagram 5] 1 is a diagram illustrating a process in which a STA sets up a link with an AP. [Figure 6] FIG. 1 is a diagram illustrating a CSMA (Carrier Sense Multiple Access) / CA (Collision Avoidance) method used in wireless LAN communication. [Figure 7] 1 shows examples of various standard generation PPDU (PLCP Protocol Data Unit) formats. [Figure 8] 1 illustrates an example of various Extremely High Throughput (EHT) Physical Protocol Data Unit (PPDU) formats and a method for indicating the same according to an embodiment of the present invention. [Figure 9] 1 illustrates an example of an encoding structure and transmission method of an EHT-SIG field according to an embodiment of the present invention. [Figure 10]1 shows an example of various BW modes of EHT SU PPDU. [Figure 11] The distribution of RU allocations for 20, 40, and 80 MHz used in 11ax and 11be is shown. [Figure 12] An example of the BW mode of the EHT MU PPDU is shown. [Figure 13] 1 illustrates an example of a discontinuous channel configuration that follows a BW utilization rule according to an embodiment of the present invention. [Figure 14] 1 shows an example of a discontinuous channel configuration according to a puncturing resolution according to an embodiment of the present invention. [Figure 15] 1 illustrates an embodiment of the present invention, showing an example of a discontinuous channel configuration depending on the number of RUs to be decoded. [Figure 16] 1 shows an example of a PPDU format in a discontinuous channel according to an embodiment of the present invention. [Figure 17] 4 illustrates an example of non-contiguous channels separated by frequency segments according to one embodiment of the present invention. [Figure 18] 4 illustrates an example of a discontinuous channel for single user transmission according to one embodiment of the present invention. [Figure 19] 1 illustrates an example of discontinuous channels for a particular bandwidth in accordance with one embodiment of the present invention. [Figure 20] 1 shows an example of a PPDU format for an extremely high throughput (EHT) wireless LAN according to an embodiment of the present invention. [Figure 21] 1 illustrates an embodiment of a U-SIG field of an EHT PPDU and fields that constitute the U-SIG field according to an embodiment of the present invention. [Figure 22] 1 illustrates an embodiment for an EHT-SIG in uncompressed form according to one embodiment of the present invention. [Diagram 23] 1 illustrates an example of a resource unit configuration with fields for allocating resource units according to an embodiment of the present invention. [Figure 24]13 illustrates an example of an EHG-SIG field when a non-OFDMA PPDU according to an embodiment of the present invention is applied. [Diagram 25] 1 illustrates an example of an EHT-SIG field when a single user (SU) PPDU is applied according to an embodiment of the present invention. [Figure 26] 1 illustrates an embodiment of large resource unit allocation (Large RU Allocation) according to an embodiment of the present invention. [Figure 27] 4 illustrates an example of single content channel signaling for OFDMA MU PPDU according to an embodiment of the present invention. [Figure 28] 4 illustrates an example of two content channel signaling for a specific frequency band according to an embodiment of the present invention. [Figure 29] 13 illustrates yet another example of two content channel signaling for a specific frequency band according to an embodiment of the present invention. [Diagram 30] 13 illustrates yet another example of two content channel signaling for a specific frequency band according to an embodiment of the present invention. [Diagram 31] 1 illustrates an example of four content channels for an OFDMA MU PPDU in a specific frequency band according to an embodiment of the present invention. [Diagram 32] 1 illustrates an example of four content channels for an OFDMA MU PPDU in a specific frequency band according to an embodiment of the present invention. [Diagram 33] 13 illustrates yet another example of four content channel signaling for a specific frequency band according to an embodiment of the present invention. [Diagram 34] 1 illustrates an example of how resource units of different sizes are configured in accordance with an embodiment of the present invention. [Diagram 35] 13 illustrates yet another example of how resource units of different sizes are configured according to an embodiment of the present invention. [Diagram 36]1 shows an example of an EHT-SIG repeated within a bandwidth when signaling a content channel according to one embodiment of the present invention. [Figure 37] 13 shows yet another example of an EHT-SIG repeated within a bandwidth when signaling a content channel according to one embodiment of the present invention. [Figure 38] 1 is a flowchart illustrating an example of a PPDU receiving method of a terminal according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] The terms used in this specification are selected as general terms that are currently widely used as much as possible in consideration of the functions of the present invention, but this may vary depending on the intentions, customs, or the emergence of new technologies of the engineers in the relevant technical field. In addition, in certain cases, the applicant may arbitrarily select terms, and in such cases, the meanings of the terms will be described in the description of the relevant invention. Therefore, it is clear that the terms used in this specification should be interpreted not simply as terms, but based on the substantial meanings of the terms and the contents of this specification as a whole.

[0033] Throughout the specification, when a component is "connected" to another component, this includes not only when it is "directly connected" to another component, but also when it is "electrically connected" with another component in between. Furthermore, when a component "includes" a specific component, this means that it may further include the other component, not excluding the other component, unless otherwise specified to the contrary. In addition, limitations such as "greater than" or "less than" based on a specific critical value may be appropriately replaced with "more than" or "less than" depending on the embodiment.

[0034] Hereinafter, in the present invention, the terms field and subfield may be used interchangeably.

[0035] FIG. 1 is a diagram showing a wireless LAN system according to an embodiment of the present invention.

[0036] A wireless LAN system includes one or more Basic Service Sets (BSS), which are a set of devices that can successfully synchronize and communicate with each other. Generally, BSSs are classified into infrastructure BSSs and independent BSSs (IBSSs), and Figure 1 shows an infrastructure BSS.

[0037] As shown in FIG. 1, infrastructure BSSs BSS1 and BSS2 include one or more stations STA1, STA2, STA3, STA4, and STA5, access points AP-1 and AP-2 which are stations providing a distribution service, and a distribution system DS which connects multiple access points AP-1 and AP-2.

[0038] A station (STA) is any device including a medium access control (MAC) and a physical layer interface for a wireless medium according to the IEEE 802.11 standard, and in a broad sense includes not only non-AP stations but also APs. In this specification, the term "terminal" refers to either a non-AP or an AP, or both. A station for wireless communication includes a processor and a communication unit, and further includes a user interface unit and a display unit, etc., depending on the embodiment. The processor generates frames to be transmitted through a wireless network, processes frames received through the wireless network, and performs various other processes for controlling the station. The communication unit is functionally connected to the processor and transmits and receives frames through the wireless network for the station. In the present invention, the term "terminal" is used to include a user equipment (UE).

[0039] An access point (AP) is an entity that provides a connection to a distribution system DS via a wireless medium for a station associated therewith. In an infrastructure BSS, communication between non-AP stations is generally performed via the AP, but when a direct link is set up, direct communication is possible between non-AP stations. Meanwhile, in the present invention, AP is used as a concept including a personal BSS coordination point (PCP), but in a broad sense, AP includes all concepts such as a central controller, a base station (BS), a node B, a base transceiver system (BTS), or a site controller. In the present invention, AP is also referred to as a base wireless communication terminal, but in a broad sense, the base wireless communication terminal is used as a term including an AP, a base station, an eNodeB (eNB), and a transmission point TP. In addition, the base wireless communication terminal includes various types of wireless communication terminals that allocate communication medium resources and perform scheduling in communication with a plurality of wireless communication terminals.

[0040] A plurality of infrastructure BSSs are connected to each other via a distribution system DS. In this case, a plurality of BSSs connected to each other via the distribution system is called an Extended Service Set (ESS).

[0041] 2 is a diagram showing an independent BSS, which is a wireless LAN system according to another embodiment of the present invention, in which the same or corresponding parts in the embodiment of FIG. 2 are described in the same manner as in the embodiment of FIG.

[0042] BSS3 shown in Figure 2 is an independent BSS and does not include an AP, so all stations (STA6, STA7) are not connected to an AP. 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 each other.

[0043] 3 is a block diagram showing a configuration of a station 100 according to an embodiment of the present invention. As shown in the figure, the 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.

[0044] First, the communication unit 120 transmits and receives wireless signals such as wireless LAN packets, and may be built into or externally provided in the station 100. According to an embodiment, the communication unit 120 may include at least one communication module using different frequency bands. For example, the communication unit 120 may include communication modules of different frequency bands such as 2.4 GHz, 5 GHz, 6 GHz, and 60 GHz. According to an embodiment, the station 100 may include a communication module using a frequency band of 7.125 GHz or more and a communication module using a frequency band of 7.125 GHz or less. Each communication module may perform wireless communication with an AP or an external station based on the wireless LAN standard of the frequency band supported by the communication module. The communication unit 120 may operate only one communication module at a time or operate multiple communication modules simultaneously according to the performance and requirements of the station 100. When the station 100 includes multiple communication modules, each communication module may be provided in an independent form, or multiple modules may be integrated into one chip. In an embodiment of the present invention, the communication unit 120 may represent a radio frequency (RF) communication module that processes RF signals.

[0045] Next, the user interface 140 includes various types of input / output means provided in the station 100. That is, 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. Also, the user interface unit 140 performs output based on a command from the processor 110 using various output means.

[0046] Then, the display unit 150 outputs an image on a display screen. The display unit 150 outputs various display objects such as a user interface based on the contents performed by the processor 110 or a control command of the processor 110. The memory 160 also stores control programs used by the station 100 and various data associated therewith. Such control programs include connection programs required for the station 100 to connect to an AP or an external station.

[0047] The processor 110 of the present invention executes various commands or programs to process data within the station 100. The processor 110 also controls each unit of the station 100 and controls transmission and reception of data between the units. According to an embodiment of the present invention, the processor 110 executes a program for connection with an AP stored in the memory 160 and receives a communication setup message transmitted by the AP. The processor 110 also reads information on the priority conditions of the station 100 included in the communication setup message and requests a connection to the AP based on the information on the priority conditions of the station 100. The processor 110 of the present invention may refer to a main control unit of the station 100, or may refer to a control unit for individually controlling some components of the station 100, for example, the communication unit 120, depending on the embodiment. That is, the processor 110 may be a modem that modulates and demodulates a wireless signal transmitted and received from the communication unit 120, or a modulator and / or demodulator. The processor 110 controls various operations of transmitting and receiving wireless signals of the station 100 according to an embodiment of the present invention. A detailed embodiment of the present invention will be described later.

[0048] The station 100 shown in FIG. 3 is a block diagram according to an embodiment of the present invention, and the separate blocks are used to logically distinguish the elements of the device. Thus, the above-mentioned device elements may be mounted on one chip or multiple chips depending on the design of the device. For example, the processor 110 and the communication unit 120 may be integrated and embodied on one chip, or may be embodied on separate chips. In addition, in an 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.

[0049] 4 is a block diagram showing a configuration of an AP 200 according to an embodiment of the present invention. As shown in the figure, the AP 200 according to the embodiment of the present invention includes a processor 210, a communication unit 220, and a memory 260. In FIG. 4, a duplicated description of parts of the configuration of the AP 200 that are the same as or correspond to the configuration of the station 100 in FIG. 3 will be omitted.

[0050] Referring to FIG. 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 FIG. 3, the communication unit 220 of the AP 200 may also include a plurality of communication modules using different frequency bands. That is, the AP 200 according to the embodiment of the present invention may include two or more communication modules using different frequency bands, for example, any of 2.4 GHz, 5 GHz, 6 GHz, and 60 GHz. Preferably, the AP 200 may 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 may perform wireless communication with a station based on the WLAN standard of the frequency band supported by the communication module. The communication unit 220 may operate only one communication module at a time or operate multiple communication modules simultaneously according to the performance and requirements of the AP 200. In the embodiment of the present invention, the communication unit 220 may represent an RF communication module that processes RF (Radio Frequency) signals.

[0051] Next, the memory 260 stores control programs used in the AP 200 and various data associated therewith. Such control programs include a connection program for managing the connection of stations. Also, the processor 210 controls each unit of the AP 200 and controls transmission and reception of data between the units. According to an embodiment of the present invention, the processor 210 executes a program for connection with a station stored in the memory 260 and transmits a communication setting message to one or more stations. At this time, the communication setting message includes information regarding connection priority conditions of each station. Also, the processor 210 performs connection setting in response to a connection request of a station. According to an embodiment, the processor 210 is a modem or a modulation / demodulation unit that modulates and demodulates a wireless signal transmitted and received from the communication unit 220. The processor 210 controls various operations of transmitting and receiving wireless signals of the AP 200 according to an embodiment of the present invention. A detailed embodiment thereof will be described later.

[0052] FIG. 5 is a diagram illustrating a process in which a STA establishes a link with an AP.

[0053] 5, the link between the STA 100 and the AP 200 is set up through three steps: scanning, authentication, and association. First, the scanning step is a step in which the STA 100 acquires connection information of the BSS operated by the AP 200. There are two methods for performing scanning: a passive scanning method in which the STA 100 acquires information using only a beacon message S101 periodically transmitted by the AP 200, and an active scanning method in which the STA 100 transmits a probe request to the AP S103, receives a probe response from the AP S105, and acquires connection information.

[0054] The STA 100 that has successfully received wireless connection information in the scanning step transmits an authentication request (S107a), receives an authentication response from the AP 200 (S107b), and performs an authentication step. After the authentication step is performed, the STA 100 transmits an association request (S109a), receives an association response from the AP 200, and performs an association step (S109b). In this specification, association basically means wireless association, but the present invention is not limited thereto, and association in a broad sense includes both wireless association and wired association.

[0055] Meanwhile, an 802.1X-based authentication step S111 and an IP address acquisition step S113 via DHCP are additionally performed. In Fig. 5, the server 300 is a server that processes 802.1X-based authentication with the STA 100, and may be physically connected to the AP 200 or may exist as a separate server.

[0056] FIG. 6 is a diagram showing a Carrier Sense Multiple Access (CSMA) / Collision Avoidance (CA) method used in wireless LAN communication.

[0057] A terminal performing wireless LAN communication performs carrier sensing before transmitting data to check whether a channel is occupied or not. If a wireless signal of a certain strength or more is detected, the channel is determined to be occupied and the terminal delays access to the channel. This process is called Clear Channel Assessment (CCA), and the level that determines whether or not the signal is detected is called the CCA threshold. If a wireless signal of a strength greater than the CCA threshold is received by the terminal and the terminal is the receiver, the terminal processes the received wireless signal. On the other hand, if no wireless signal is detected from the channel or a wireless signal of a strength less than the CCA threshold is detected, the channel is determined to be idle.

[0058] If the channel is determined to be in an idle state, each terminal having data to transmit performs a backoff procedure after an IFS (Inter Frame Space) time, such as an AIFS (Arbitration IFS) or a PIFS (PCF IFS), depending on the status of each terminal. In some embodiments, the AIFS is used as a configuration to replace the conventional DIFS (DCF IFS). Each terminal waits while decreasing a slot time by a random number determined for the corresponding terminal during the idle interval of the channel, and a terminal that has exhausted all the slot time attempts to access the corresponding channel. The period in which each terminal performs a backoff procedure is called a contention window period.

[0059] If a specific terminal succeeds in accessing the channel, the terminal transmits data through the channel. However, if the terminal attempting access collides with another terminal, the colliding terminals are assigned new random numbers and perform a backoff procedure again. According to one embodiment, the random numbers newly assigned to each terminal are determined within a range (2*CW) twice the range (contention window, CW) of the random numbers previously assigned to the terminal. Meanwhile, each terminal attempts access by performing a backoff procedure again in the next contention window period, and at this time, each terminal performs the backoff procedure from the slot time remaining in the previous contention window period. In this manner, each terminal performing wireless LAN communication can avoid collision with each other on a specific channel.

[0060] <Examples of various PPDU formats>

[0061] FIG 7 shows an example of various standard generation PPDU (PLCP Protocol Data Unit) formats. More specifically, FIG 7(a) shows an example of a legacy PPDU format based on 802.11a / g, FIG 7(b) shows an example of a HE PPDU format based on 802.11ax, and FIG 7(c) shows an example of a non-legacy PPDU (i.e., EHT PPDU) format based on 802.11be. Also, FIG 7(d) shows detailed field configurations of L-SIG and RL-SIG commonly used in the PPDU formats.

[0062] 7(a), the preamble of the legacy PPDU includes a legacy short training field (L-STF), a legacy long training field (L-LTF), and a legacy signal field (L-SIG). In an embodiment of the present invention, the L-STF, L-LTF, and L-SIG may be referred to as a legacy preamble.

[0063] Referring to FIG. 7(b), the preamble of the HE PPDU further includes a RL-SIG (Repeated Legacy Short Training field), a HE-SIG-A (High Efficiency Signal A field), a HE-SIG-B (High Efficiency Signal B field), a HE-STF (High Efficiency Short Training field), and a HE-LTF (High Efficiency Long Training field) in addition to the legacy preamble. In an embodiment of the present invention, the RL-SIG, HE-SIG-A, HE-SIG-B, HE-STF, and HE-LTF can be referred to as an HE preamble. The specific configuration of the HE preamble may be modified according to the HE PPDU format. For example, the HE-SIG-B may be used only in the HE MU PPDU format.

[0064] Referring to FIG. 7(c), the preamble of the EHT PPDU further includes a RL-SIG (Repeated Legacy Short Training field), a U-SIG (Universal Signal field), an EHT-SIG-A (Extremely High Throughput Signal A field), an EHT-SIG-A (Extremely High Throughput Signal B field), an EHT-STF (Extremely High Throughput Short Training field), and an EHT-LTF (Extremely High Throughput Long Training field) in addition to the legacy preamble. In an embodiment of the present invention, the RL-SIG, EHT-SIG-A, EHT-SIG-B, EHT-STF, and EHT-LTF can be called an EHT preamble. The specific configuration of the non-legacy preamble may be modified according to the EHT PPDU format. For example, EHT-SIG-A and EHT-SIG-B may be used only in some formats of the EHT PPDU format.

[0065] The L-SIG field included in the preamble of the PPDU is configured with a total of 64 subcarriers by applying 64 FFT OFDM. Of these, 48 subcarriers excluding the guard subcarriers, DC subcarriers, and pilot subcarriers 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.

[0066] Referring to FIG. 7(d), the L-SIG includes an L_RATE field and an L_LENGTH field. The L_RATE field is composed 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 is a combination of a modulation method such as BPSK / QPSK / 16-QAM / 64-QAM and a code rate such as 1 / 2, 2 / 3, or 3 / 4. The total length of the PPDU can be indicated by combining the information in the L_RATE field and the L_LENGTH field. In the non-legacy PPDU format, the L_RATE field is set to the minimum speed of 6 Mbps.

[0067] The unit of the L_LENGTH field is byte, and a total of 12 bits are allocated so that a maximum of 4095 can be signaled. The length of the corresponding PPDU can be indicated in combination with the L_RATE field. In this case, legacy and non-legacy terminals can interpret the L_LENGTH field in different ways.

[0068] First, a method in which a legacy or non-legacy terminal analyzes the length of the PPDU using the L_LENGTH field is as follows. When the L_RATE field is set to 6 Mbps, 3 bytes (i.e., 24 bits) may be transmitted at 4 us, which is one symbol duration of 64 FFT. Therefore, the number of 64 FFT reference symbols after the L-SIG is obtained by adding 3 bytes corresponding to the SVC field and the Tail field to the L_LENGTH field value and dividing it by 3 bytes, which is the transmission amount of one symbol. The length of the PPDU, i.e., the reception time (RXTIME), is obtained by multiplying the obtained number of symbols by 4 us, which is one symbol duration, and adding 20 us for the transmission of the L-STF, L-LTF, and L-SIG. This can be expressed as the following Equation 1.

[0069]

number

[0070] At this time,

number

[0071]

number

[0072] Here, TXTIME is the total transmission time constituting the PPDU, and is expressed as the following Equation 3. In this case, TX represents the transmission time of X.

[0073]

number

[0074] Referring to the above formula, 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 ​​of L_LENGTH={3k+1, 3k+2, 3(k+1)} indicate the same PPDU length.

[0075] Referring to FIG. 7(e), the U-SIG (Universal SIG) field remains in the EHT PPDU and the PPDU of the succeeding generation of WLAN, and plays a role in identifying which generation of PPDU it is, including 11be. The U-SIG is two symbols of 64FFT-based OFDM and can transmit a total of 52 bits of information. Of these, 43 bits excluding the CRC / tail 9 bits are roughly divided into a VI (Version Independent) field and a VD (Version Dependent) field.

[0076] The VI bit will maintain the current bit configuration, and even if a subsequent generation PPDU is defined, a current 11be terminal can obtain information about the PPDU from the VI field of the PPDU. To this end, the VI field is composed of PHY version, UL / DL, BSS color, TXOP, and Reserved fields. The PHY version field is 3 bits long and serves to sequentially distinguish 11be and subsequent generation WLAN standards by version. 11be has a value of 000b. The UL / DL field distinguishes whether the corresponding PPDU is an uplink / downlink PPDU. The BSS color means a BSS-specific identifier defined in 11ax and has a value of 6 bits or more. The TXOP means a transmit opportunity duration that was transmitted in the MAC header, but by adding it to the PHY header, the length of the TXOP containing the corresponding PPDU can be inferred without decoding the MPDU, and has a value of 7 bits or more.

[0077] The VD field may be composed of fields commonly used in any PPDU format, such as PPDU format and BW, which are signaling information useful only for PPDUs of the 11be version, and fields defined differently for each PPDU format. The PPDU format is a division factor that distinguishes EHT SU (Single User), EHT MU (Multiple User), EHT TB (Trigger-based), EHT ER (Extended Range) PPDU, etc. The BW field mainly signals five basic PPDU BW options of 20, 40, 80, 160 (80+80), and 320 (160+160) MHz (BWs that can be expressed in the form of a power of 20*2 can be called basic BWs), and various remaining PPDU BWs formed by preamble puncturing. After being signaled at 320 MHz, some 80 MHz may be signaled in a punctured form. Also, the punctured and modified channel shape may be directly signaled in the BW field, or may be signaled using both the BW field and a field that appears after the BW field (e.g., a field in 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.

[0078] The fields located after the BW field vary depending on the type and format of the PPDU. The MU PPDU and the SU PPDU may be signaled in the same PPDU format, and a field for distinguishing the MU PPDU from the SU PPDU may be located before the EHT-SIG field, and additional signaling may be performed for this purpose. Both the SU PPDU and the MU PPDU include an EHT-SIG field, but some fields that are not necessary in the SU PPDU may be compressed. In this case, the information of the compressed field may be omitted or may have a reduced size compared to the size of the original field included in the MU PPDU. For example, in the case of the SU PPDU, the common field of the EHT-SIG may be omitted or replaced, or the user-specific field may be replaced or reduced to one, and may have a different configuration.

[0079] Alternatively, the SU PPDU may further include a compression field indicating whether or not it is compressed, and some fields (eg, the RA field, etc.) may be omitted depending on the value of the compression field.

[0080] When a part of the EHT-SIG field of the SU PPDU is compressed, the information included in the compressed field may be signaled together in an uncompressed field (e.g., a common field, etc.). In the case of the MU PPDU, 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 recognize the location of the RU to which the MU PPDU is transmitted, the STA to which each RU is assigned, and whether the transmitted MU PPDU was transmitted to itself. Therefore, the AP must transmit the above information in the EHT-SIG field. To this end, the U-SIG field signals information for efficiently transmitting the EHT-SIG field, which may be the number of symbols of the EHT-SIG field and / or MCS, which is a modulation method. The EHT-SIG field may include the size and location information of the RU assigned to each user.

[0081] In the case of a SU PPDU, a STA may be assigned multiple RUs, and the multiple RUs may be contiguous or discontinuous. If the RUs assigned to the STA are not contiguous, the STA can receive the SU PPDU efficiently only by recognizing the RUs punctured in between. Therefore, the AP can transmit the SU PPDU including information on the punctured RUs among the RUs assigned to the STA (e.g., the puncturing pattern of the RUs, etc.). That is, in the case of a SU PPDU, a puncturing mode field including information indicating whether a puncturing mode is applied and the puncturing pattern in a bitmap format, etc., may be included in the EHT-SIG field, and the puncturing mode field may signal the type of discontinuous channels that appear within the bandwidth.

[0082] The form of the signaled discontinuous channel is limited, and indicates the BW and discontinuous channel information of the SU PPDU in combination with the value of the BW field. For example, in the case of a SU PPDU, since it is a PPDU transmitted only to a single UE, the STA can recognize the bandwidth allocated to itself from the BW field included in the PPDU, and can recognize the punctured resources of the allocated bandwidth from the puncturing mode field of the U-SIG field or EHT-SIG field included in the PPDU. In this case, the UE can receive the PPDU in the remaining resource units except for the specific channel of the punctured resource unit. In this case, the multiple RUs allocated to the STA may be configured with different frequency bands or tones.

[0083] The reason why only limited discontinuous channel types are signaled is to reduce the signaling overhead of SU PPDU. Since puncturing may be performed for each 20 MHz subchannel, if puncturing is performed for a BW having multiple 20 MHz subchannels such as 80, 160, and 320 MHz, in the case of 320 MHz, the discontinuous channel type (when only the end 20 MHz is punctured and considered as discontinuous) must be signaled by expressing whether or not the remaining 15 20 MHz subchannels except the primary channel are used. In this way, using 15 bits to signal discontinuous channel types for single user transmission may result in excessive signaling overhead when considering the low transmission speed of the signaling part.

[0084] The present invention proposes a method for signaling the discontinuous channel type of SU PPDU, and illustrates the discontinuous channel type determined by the proposed method. In addition, a method for signaling the puncturing types of primary 160 MHz and secondary 160 MHz in the 320 MHz BW configuration of SU PPDU is proposed. The discontinuous channel types allowed when the above discontinuous channel type definition method is applied and a method for signaling the discontinuous channel type with 3 bits are shown in Figures 17 to 19.

[0085] In addition, in one embodiment of the present invention, a method is proposed in which the configuration of the PPDU indicated by the preamble puncturing BW value is different depending on the PPDU format signaled in the PPDU format field. Assuming that the BW field is 4 bits, in the case of EHT SU PPDU or TB PPDU, one symbol of EHT-SIG-A is further signaled after U-SIG, or EHT-SIG-A does not need to be signaled from the beginning, so that up to 11 puncturing modes must be completely signaled using only the BW field of U-SIG in consideration of this. However, in the case of EHT MU PPDU, EHT-SIG-B is further signaled after U-SIG, so up to 11 puncturing modes can be signaled in a different manner from SU PPDU. In the case of EHT ER PPDU, the BW field is set to 1 bit, and it is possible to signal whether the PPDU uses a 20 MHz or 10 MHz band. Detailed puncturing patterns for each PPDU type will be described in detail below with reference to FIG. 11 and FIG. 12.

[0086] FIG. 7(f) shows the format-specific field configuration of the VD field when the PPDU format field of the U-SIG indicates EHT MU PPDU. 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.

[0087] FIG. 8 illustrates an example of various Extremely High Throughput (EHT) Physical Protocol Data Unit (PPDU) formats and a method for indicating the same according to an embodiment of the present invention.

[0088] 8, a PPDU may be composed of a preamble and a data portion, and the format of an EHT PPDU, which is one type, may be distinguished by a U-SIG field included in the preamble. Specifically, whether the format of the PPDU is an EHT PPDU may be indicated based on a PPDU format field included in the U-SIG field.

[0089] 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) transmission between an AP and a single STA, and an EHT-SIG-A field for additional signaling may be located after the U-SIG field.

[0090] 8(b) shows an example of an EHT trigger-based PPDU format, which is an EHT PPDU transmitted based on a trigger frame. The EHT trigger-based PPDU is an EHT PPDU transmitted based on a trigger frame, and is an uplink PPDU used for responding to the trigger frame. Unlike the EHT SU PPDU, the EHT PPDU does not have an EHT-SIG-A field after the U-SIG field.

[0091] 8(c) shows an example of an EHT MU PPDU format, which is an EHT PPDU for multiple users. The EHT MU PPDU is a PPDU used to transmit a PPDU to one or more STAs. In the EHT MU PPDU format, an HE-SIG-B field may be located after the U-SIG field.

[0092] Fig. 8(d) shows an example of an EHT ER SU PPDU format used for single-user transmission with an STA in an extended range. The EHT ER SU PPDU may be used for single-user transmission with a STA in a wider range than the EHT SU PPDU described in Fig. 8(a), and the U-SIG field may be repeatedly positioned on the time axis.

[0093] The EHT MU PPDU described in (c) of FIG. 8 can be used by the 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 the PPDU transmitted from the AP. The EHT MU PPDU can convey AID information of the receiver and / or sender of the PPDU transmitted through the user specific field of the EHT-SIG-B to the STA. Therefore, multiple terminals receiving the EHT MU PPDU can perform spatial reuse based on the AID information of the user specific field included in the preamble of the received PPDU.

[0094] Specifically, the resource unit allocation (RA) field of the HE-SIG-B field included in the HE MU PPDU may include information regarding a resource unit configuration (e.g., a resource unit division form) in a specific bandwidth (e.g., 20 MHz, etc.) on the frequency axis. That is, the RA field may indicate a resource unit configuration divided by a bandwidth for transmitting the HE MU PPDU so that the STA receives the PPDU. Information on the STA allocated (or designated) to each divided resource unit may be included in a user specific field of the EHT-SIG-B and transmitted to the STA. That is, the user specific field may include one or more user fields corresponding to each divided resource unit.

[0095] For example, a user field corresponding to at least one resource unit used for data transmission among the multiple divided resource units may include the AID of a receiver or sender, and a user field corresponding to the remaining resource units not used for data transmission may include a null STA ID that has already been set.

[0096] 9 shows an example of an encoding structure and a transmission method of an EHT-SIG field according to an embodiment of the present invention. Fig. 9(a) shows an encoding structure in which EHT-SIG-B is encoded, and Fig. 9(b) shows a transmission method of EHT-SIG-B in a bandwidth of 40 MHz or more.

[0097] 9(a), the EHT-SIG-B may be composed of a common block field and a user specific field. The user specific field may include at least one user field, and each user field may be arranged in the order of the assigned user according to the arrangement of resource units indicated by the RA (Resource Allocation) field of the common block field.

[0098] The user specific field is composed of at least one user field, and the at least one user field is transmitted in units of user block fields. As mentioned above, the user block field is composed of two user fields, a CRC field, and a tail field. If the total number of user fields is odd, the last user block field may contain only one user field. Padding may be added to the end of the EHT-SIG-B according to the OFDM symbol boundary.

[0099] Referring to FIG. 9(b), EHT-SIG-B is encoded separately in each 20 MHz band. In this case, EHT-SIG-B may be composed of up to two contents in 20 MHz units, namely, EHT-SIG-B content channel 1 and EHT-SIG-B content channel 2. In FIG. 9(b), each box represents a 20 MHz band, and "1" and "2" in the box represent EHT-SIG-B content channel 1 and EHT-SIG-B content channel 2, respectively. In the total band, each HE-SIG-B content channel is arranged according to the order of the physical frequency band. That is, HE-SIG-B content channel 1 is transmitted in the lowest frequency band, and HE-SIG-B content channel 2 is transmitted in the next higher frequency band. Such a content channel configuration is repeated by content duplication in the next higher frequency band. For example, for channels 1 to 4 in ascending frequency order that make up the entire 80 MHz band, HE-SIG-B content channel 1 is transmitted on channels 1 and 3, and HE-SIG-B content channel 2 is transmitted on channels 2 and 4. Similarly, for channels 1 to 8 in ascending frequency order that make up the entire 160 MHz band, HE-SIG-B content channel 1 is transmitted on channels 1, 3, 5, and 7, and HE-SIG-B content channel 2 is transmitted on channels 2, 4, 6, and 8. Similarly, of the 1st to 16th frequency channels which make up the entire 320 MHz band in ascending frequency order, HE-SIG-B content channel 1 is transmitted on channels 1, 3, 5, 7, 9, 11, 13, and 15, and HE-SIG-B content channel 2 is transmitted on channels 2, 4, 6, 8, 10, 12, 14, and 16.A terminal can obtain information about the MU PPDU configuration of the total bandwidth if it can use at least one channel to decode HE-SIG-B content channel 1 and at least one other channel to decode HE-SIG-B content channel 2. On the other hand, if the total bandwidth is 20 MHz, only one SIG-B content channel is transmitted.

[0100] FIG. 10 shows an example of various BW modes of an EHT SU PPDU.

[0101] Referring to FIG. 10, in 801.11be, the EHT may transmit a PPDU in a maximum bandwidth of 320 MHz, and in this case, there is a problem that the PPDU can be transmitted only when all channels are idle. In the case of 11ax using Orthogonal Frequency Division Multiplexing Access (OFDMA), in the MU PPDU in which the AP transmits a PPDU to multiple STAs, a preamble puncturing mode is possible, which is a mode in which only channels whose CCA results are idle in each 20 MHz in which the MU PPDU is transmitted are combined and transmitted. In the case of 11be, such a preamble puncturing mode can also be used in the SU PPDU transmitted by the AP to a single STA. That is, when the AP transmits a PPDU to multiple STAs or transmits a PPDU to a single STA, the AP can transmit a PPDU by combining only idle channels even if all channels in the entire bandwidth are not idle. In the case of a SU PPDU, when multiple resource units are assigned to a single STA, using such a preamble puncturing mode, the AP can transmit a PPDU to the single STA only on the channels of the resource units that are idle.

[0102] Hereinafter, a BW indicator indicating the (maximum) bandwidth for the transmission of the PPDU may be transmitted by the bandwidth field of the U-SIG.

[0103] As shown in FIG. 10, the modes from BW=0 to BW=4 are examples of transmitting PPDUs by combining consecutive channels without preamble puncturing. The modes from BW=5 to 9 are BW modes of PPDUs that combine and transmit channels other than busy channels among the remaining 20 MHz secondary channels excluding the 20 MHz primary channel in the entire 80 MHz channel bandwidth. In the case of BW=5 to 6, the channel that is finally transmitted and occupied is 40 MHz, and in the case of BW7 to 9, it occupies 60 MHz. As described above, in order to perform preamble puncturing of SU PPDUs in a maximum 80 MHz bandwidth, the sender prepares A-MPDUs, which are data to be transmitted for each 20 MHz RU, in the form of PSDUs, and then transmits PPDUs only in the 20 MHz band including P20 that is available according to the CCA result immediately before transmission. In this case, the form of RUs prepared for each 20 MHz band must be an individual 20 MHz RU form, which is different from the 20 MHz RUs in the 80 MHz RU allocation of 11ax. This is because when transmitting data in a 242 RU allocation, which corresponds to 20 MHz in an 80 MHz RU allocation, if the 20 MHz adjacent channel is punctured, an interference signal may leak into the punctured channel.

[0104] Therefore, if a STA preparing to transmit in the 80 MHz band in a SU PPDU attempts to transmit a preamble puncturing, it prepares four PSDUs corresponding to RUs of the same type as individual 20 MHz transmission for each 20 MHz band, and then transmits the prepared PSDUs on an available 20 MHz channel according to the CCA result. In this case, if four PSDUs corresponding to four 20 MHz RUs constituting an 80 MHz transmission RU are generated and prepared, and transmitted in puncturing mode according to the CCA result, interference may occur in the punctured channel. Hereinafter, an example will be described with reference to FIG. 11.

[0105] Figure 11 shows the distribution of RU allocation for 20, 40, and 80 MHz used in 11ax and 11be. In the case of 160 MHz, the 80 MHz RU in Figure 11(c) may be implemented in a form in which it is repeated twice. In the case of 320 MHz, 160 MHz may be implemented in a form in which it is repeated twice, or the 80 MHz RU in Figure 11(c) may be implemented in a form in which it is repeated four times. In the case of 240 MHz, it is implemented in a form of 80+160 or 160+80 MHz, so the 80 MHz RU in Figure 11(c) may be implemented in a form in which it is repeated three times.

[0106] Comparing Figures 11(a) and 11(c), it can be seen that when the 20 MHz RU allocation is defined within the entire 20 MHz band (a), there are guard carriers on the left and right of the 242 carriers, whereas when it is defined within the entire 80 MHz band (c), the 242 carriers are transmitted without guard carriers on the left and right.

[0107] The modes of BW=10 to 14 in FIG. 10 are BW modes of PPDUs that combine and transmit the remaining secondary channels, excluding the 40 MHz channel including the main channel 20 MHz, in the entire 160 MHz channel bandwidth, except for the busy channels. In the case of BW=10 to 11, the channel that is finally transmitted and occupied is 80 MHz, and in the case of BW12 to 14, 120 MHz is occupied. As described above, in order to perform preamble puncturing of SU PPDU in a maximum 160 MHz bandwidth, the sender prepares A-MPDU, which is data to be transmitted for each 40 MHz RU, in the form of PSDU, and then transmits only in the available 40 MHz band including P40 according to the CCA result immediately before transmission. In this case, the form of RU prepared for each 40 MHz band must be the form of individual 40 MHz RU, not the 40 MHz RU in the 160 MHz RU allocation of 11ax. This is for the reasons described above. The 160MHz RU is a form in which the 80MHz RU in Figure 11(c) is repeated for each 80MHz channel. Comparing Figure 11(b) and Figure 11(c), it can be seen that when the 40MHz RU allocation is defined within the entire 40MHz band (b), there are guard carriers on the left and right of the 484 carriers, whereas when it is defined within the entire 80MHz band (c), there are no guard carriers on the left and right of the 484 carriers.

[0108] The modes from BW=15 to 19 are BW modes of PPDUs that combine and transmit the remaining secondary channels, excluding the 80 MHz channel including the main channel 20 MHz, in the entire 320 MHz channel bandwidth, except for the busy channels. In the case of BW=15 to 16, the channel that is finally transmitted and occupied is 160 MHz, and in the case of BW=17 to 19, it occupies 240 MHz. As described above, in order to perform preamble puncturing of SU PPDU in a maximum bandwidth of 320 MHz, the transmitter prepares A-MPDU, which is data to be transmitted for each 80 MHz RU, in the form of PSDU, and then transmits only in the available 80 MHz band including P80 according to the CCA result immediately before transmission. In this case, the form of RU prepared for each 80 MHz band is the 996 carrier form of the 80 MHz RU in FIG. 11(c).

[0109] FIG. 12 shows an example of the BW mode of the EHT MU PPDU.

[0110] The modes BW=0 to BW=4 are embodiments in which a PPDU is transmitted by combining consecutive channels without preamble puncturing, and are the same as SU PPDU. In this case, as described above, a BW indicator indicating the bandwidth for transmitting the PPDU may be transmitted to the STA by the BW field included in the U-SIG field.

[0111] The BW=5~6 modes are PPDU BW modes that combine and transmit channels other than busy channels among the remaining 20MHz secondary channels, excluding the 20MHz primary channel, in the entire 80MHz channel bandwidth. The reason that two puncturing modes are possible, such as the BW=6 mode, is that after signaling the BW field of the U-SIG field, it is possible to signal which 20MHz secondary channel is actually punctured by the RU allocation field in the common field of the SIG-B field. This has the advantage that since there is an additional signaling field such as the SIG-B field, the BW field of the U-SIG field in the MU PPDU can only signal an approximate BW mode.

[0112] The BW=7~8 modes are BW modes of PPDUs that combine and transmit channels other than busy channels among the remaining 20MHz secondary channels excluding the 20MHz primary channel in the entire 160MHz channel bandwidth. The reason that three puncturing modes are possible, such as the BW=8 mode, is that they can be distinguished by additional signaling in the SIG-B field, as mentioned above.

[0113] The BW=9~10 modes are BW modes of PPDUs that combine and transmit channels other than busy channels among the remaining 20MHz secondary channels excluding the 20MHz primary channel in the entire 320MHz channel bandwidth. The reason that three puncturing modes such as the BW=10 mode are possible is because they can be distinguished by SIG-B signaling, as mentioned above.

[0114] FIG. 13 illustrates an example of a non-contiguous channel configuration according to the BW utilization rule according to an embodiment of the present invention.

[0115] 13, the ratio of the total bandwidth indicated by the bandwidth field included in the U-SIG field to the bandwidth used after preamble puncturing is applied must be equal to or greater than a certain ratio, i.e., even if preamble puncturing is applied, a certain ratio of the total bandwidth must be used for PPDU transmission.

[0116] For example, FIG. 13(a) shows a non-contiguous channel shape permitted for transmitting a PPDU with a bandwidth of 80 MHz, and FIG. 13(b) shows a non-contiguous channel shape permitted for transmitting a PPDU with a bandwidth of 160 MHz. When 50% or more of the bandwidth is to be utilized, in FIG. 13(a), when preamble puncturing is applied, 60 MHz of the total 80 MHz bandwidth can be utilized excluding the punctured 20 MHz, and in FIG. 13(b), when preamble puncturing is applied, 80 MHz of the total 80 MHz bandwidth can be utilized excluding the 80 MHz. In FIG. 13(a), 3 / 4 (75%) of the bandwidth is utilized after puncturing, and in FIG. 13(b), 1 / 2 (50%) of the bandwidth is utilized after puncturing, so that the minimum bandwidth utilization ratio can be satisfied.

[0117] However, in the case of Fig. 13(c), the punctured bandwidth is 100 MHz out of the total bandwidth of 160 MHz, so the available bandwidth after puncturing is less than 50%. Therefore, Fig. 13(c) is an unacceptable form of discontinuous channel.

[0118] Figures 13(a-1) and (b-1) are examples in which contiguous 40 MHz channels are used as one RU, as in (a) and (b), respectively. In this case, regardless of the UR encoding method, as in Figures 13(a) and (b), more than 50% of the bandwidth can be used after puncturing compared to the entire bandwidth, so this is an acceptable discontinuous channel form.

[0119] FIG. 14 shows an example of a discontinuous channel shape according to a puncturing resolution as an embodiment of the present invention.

[0120] Referring to FIG. 14, when puncturing is applied to a bandwidth for transmitting a PPDU, the puncturing resolution must be equal to or greater than a certain ratio of the entire bandwidth. That is, when some channels of the bandwidth for transmitting a SU PPDU or a MU PPDU are punctured, the AP can inform the STA of the pattern of RUs to be punctured by a specific field (e.g., a puncturing mode field, etc.) of the PPDU. However, when puncturing is performed within the bandwidth, the puncturing resolution must be equal to or greater than a certain ratio of the entire bandwidth.

[0121] For example, a single puncturing BW or puncturing resolution must be equal to or greater than a certain ratio (e.g., 1 / 4) of the entire BW. The reason for setting a limit on the puncturing resolution is to normalize the discontinuous channel shape that increases as the BW becomes wider. As a result, as can be seen from the embodiments of the present invention (FIGS. 17 to 19) described below, the channel shape of the entire band can be expressed by signaling the shape of discontinuous channels regardless of the BW. Also, the puncturing BW adjacent to the primary channel in the entire bandwidth can be calculated to include the primary 20 MHz.

[0122] FIG. 14(a) and (a') show discontinuous channels that are allowed when the total bandwidth is 160 MHz. Since the total BW is 160 MHz, single puncturing may be applied in units of at least 40 MHz. FIG. 14(b) shows an example when the total bandwidth is 320 MHz. Since the total bandwidth is 320 MHz, single puncturing may be applied in units of at least 80 MHz. However, when puncturing is performed in the primary channel, a case may occur where the resolution regulation cannot be met due to the puncturing constraint on the primary 20 MHz. For example, when 80 MHz puncturing is performed on the primary 80 MHz, only the secondary 20 and secondary 40 MHz can be punctured, excluding the primary 20 MHz. Therefore, when puncturing is performed in a section continuous with P20, the BW including the primary 20 MHz can be considered as the puncturing BW. For example, when only the secondary 20 MHz is punctured for 160 MHz, 40 MHz including the primary 20 MHz can be considered to be punctured. Therefore, even when 1 / 4 of the BW is set as the puncturing resolution as in the embodiment of the present invention, a discontinuous channel form in which only the secondary 20 MHz is punctured for the entire 160 MHz is permitted (for example, mode 7 in FIG. 15). The embodiment of FIG. 14(c) shows a discontinuous channel form of 160 MHz BW, in which puncturing of some channels is performed in units of 20 MHz, which is a discontinuous channel form that is not permitted by the puncturing BW criterion. That is, in FIG. 14(c), when the entire bandwidth is set to 160 MHz, the puncturing bandwidth may be limited to be performed in units of 40 MHz. However, in FIG. 14(c), a 20 MHz channel is punctured, which is a discontinuous channel form that does not satisfy the puncturing BW criterion. Therefore, such puncturing may not be permitted.

[0123] FIG. 14(d) is also unusable because it is a discontinuous channel form in which puncturing is performed in 60 MHz increments, which is not permitted for the entire 320 MHz BW.

[0124] FIG. 15 shows an example of a discontinuous channel configuration according to the number of RUs to be decoded, according to one embodiment of the present invention.

[0125] Referring to FIG. 15, the bandwidth and / or pattern to be punctured may be limited based on the total bandwidth in which the PPDU is transmitted.

[0126] Specifically, FIG. 15 shows a discontinuous channel form applicable when encoding consecutive 20 MHz channels to 40 MHz or 80 MHz RUs. When consecutive 20 MHz channels are used as 40 MHz or 80 MHz RUs, the total number of discontinuous RUs is reduced, so the decoding burden on the receiver of the discontinuous channels is reduced. As shown in FIG. 11, when looking at the distribution of 20, 40, and 80 MHz RU allocation, each RU has a guard carrier set at both ends to avoid interference from adjacent channels, and when a 20 MHz channel is used as each RU as in FIG. 13(a), the information of all 20 MHz RUs is decoded independently. Therefore, the receiver must decode each individual 20 MHz in the BW, and there is a burden of having to decode a maximum of 16 individual RUs for a 320 MHz BW. To reduce this decoding burden, after the discontinuous channel configuration is determined, the transmitting device can combine contiguous 20 MHz channels and encode them into larger RUs of 40 or 80 MHz units, which has the effect of reducing the number of individual RUs that the receiving device needs to decode simultaneously.

[0127] The same effect can also be achieved if a method is applied that reduces the decoding burden by aggregating and decoding individual 20 MHz RUs (using parsing, deinterleaving, etc.) rather than using RUs for 40 MHz or 80 MHz bandwidth.

[0128] The embodiment of FIG. 15 shows a method of limiting the number of RUs to be individually decoded in order to reduce the decoding burden of the receiving device, and the RU number limit applied in this embodiment is two. According to one embodiment, the number of RUs in a specific bandwidth unit may be limited. More specifically, the number of RUs in a 160 MHz unit (or a unit of 160 MHz or less) may be limited to two. This embodiment assumes that the transmitting device uses 40 and 80 MHz RUs, but it can also be applied to a case where 20 MHz RUs are combined in the encoding process to reduce the number of decoding RUs. It is also assumed that the 160 MHz RU is composed of two 80 MHz RUs, and the 320 MHz is composed of two 160 MHz RUs.

[0129] Figures 15(a) and 15(b) are usable discontinuous channel configurations because after the 160 MHz BW is punctured, the discontinuous channel configuration can be composed of two 40 MHz RUs, while Figure 15(c) is not applicable because the discontinuous channel is composed of a total of three RUs: two 40 MHz RUs and one 20 MHz RU.

[0130] In the cases of Figures 15(d) and 15(e), after the 320MHz BW is punctured, three RUs are configured in each case. According to the RU number regulations, the number of RUs must be two or less, but since the 320MHz operation of the EHT is physically configured as 160MHz+160MHz, the condition of two RUs is satisfied within the 160MHz BW, and it may be assumed that this is a usable discontinuous channel type. On the other hand, in Figure 15(f), 40MHz puncturing is performed on all 2160MHz that make up the 320MHz BW as in Figure 15(d), but after puncturing, each 160MHz can be configured with two 20MHz and one 40MHz RU. Therefore, Figures 15(f) and (d) are unacceptable discontinuous channel types.

[0131] FIG. 16 shows an example of a PPDU format in discontinuous channels according to an embodiment of the present invention.

[0132] FIG. 16 shows the basic formats of the EHT PPDU and EHT SU PPDU, and a discontinuous channel type separation signaling method applicable to the EHT SU PPDU with a BW exceeding 160 MHz.

[0133] Figure 16(a) shows the MU PPDU format for EHT multi-user transmission. As shown in Figure 16(a), the MU PPDU has a structure in which the EHT-SIG field is signaled after the U-SIG field. The EHT-SIG field of the MU PPDU is composed of a common field and a user field (per-user), and the common field of the EHT-SIG field may include the number of LTFs, GI+LTF size, RU allocation and / or puncturing mode.

[0134] - Number of LTFs: A field that indicates the number of symbols that make up the Long Training Field of the EHT.

[0135] - GI+LTF size: Indicates the GI (Guard-Interval) duration and EHT-LTF size information.

[0136] - RU allocation: RU configuration information for the total bandwidth for transmitting and receiving PPDUs

[0137] - Puncturing mode: indicates whether the puncturing mode is applied and / or which RUs are punctured

[0138] The user field may include STA_ID, MCS, coding, NSTS, etc. Figure 16(b) shows a SU PPDU format for single user transmission of EHT. As shown in Figure 16(b), the EHT-SIG field of the SU PPDU may be configured in a form in which some contents / fields of the MU PPDU are changed or deleted. In a general 320MHz PPDU, a preamble as shown in Figure 16(b) appears repeatedly over the entire 320MHz, but in the present invention, for the SU PPDU, an EHT-SIG field different from that of the primary 160MHz may be signaled for the secondary 160MHz as shown in Figure 16(c). That is, the EHT-SIG1 field of the primary 160MHz signals the puncturing mode of the primary 160MHz BW, and the EHT-SIG2 field of the secondary 160MHz signals the puncturing mode of the secondary 160MHz BW, respectively. In other words, the secondary 160 MHz and primary 20 MHz transmit the EHT-SIG individually without duplication, except for the duplicated fields, so the puncturing modes indicated by the secondary 160 MHz and primary 20 MHz may be different. In this case, the SU PPDU transmitted by the primary 20 MHz may be repeated up to four times (up to 160 MHz).

[0139] In other words, when the entire bandwidth is segmented into primary and secondary, the EHT-SIG fields of each PPDU transmitted in each segment, the primary and secondary, may contain different information.

[0140] Specifically, the EHT-SIG field of the primary 160 MHz may include different content from the EHT field of the secondary 160 MHz. That is, when the entire bandwidth for transmitting the PPDU is divided into two or more segments, the content included in the EHT field transmitted in each segment may be different from each other. Also, at least one field included in the EHT-SIG field in each segment may be duplicated and repeated for a certain band. For example, when the bandwidth of each segment is 80 MHz, at least one field included in the U-SIG field and / or the EHT-SIG field may include the same content every 20 MHz. That is, when the PPDU is transmitted over a 320 MHz band, and the 320 MHz is divided into a primary 160 MHz (first segment) and a secondary 160 MHz (second segment), the preamble (including the EHT-SIG field) of the PPDU may be configured to have different content from each other in each of the primary 160 MHz and the secondary 160 MHz.

[0141] In other words, the EHT-SIG field may include at least one content channel, and in each content channel, at least one corresponding field in the same segment (primary 20 MHz or secondary 160 MHz) may be set to the same value, and in different segments, at least one corresponding field may be set to a different value.

[0142] For example, when the EHT-SIG field is configured with a first content channel and a second content channel, at least one of the fields that are the same between the first content channel and the second content channel in the same segment among at least one segment may contain the same information. In this case, a Resource Unit Allocation (RU Allocation) field, which is information related to the configuration of a resource unit, may be set to a different value according to the content channel.

[0143] If the first content channel and the second content channel include a specific field, the value of the specific field may be set to be the same in the same segment, but may be set to be different in different segments.

[0144] For example, if the first and second content channels transmitted in the first segment include a first common field including at least one field including the same value, and the first and second content channels transmitted in the second segment include a second common field including at least one field including the same value, the at least one field included in the first common field and the at least one field included in the second common field may include different information from each other, and the at least one field included in the first common field and the at least one field included in the second common field may be of the same type.

[0145] The EHT-SIG field may include at least one content channel, and each content channel may be composed of at least one of the above-mentioned common field, resource unit allocation field, or user specific field, where the resource unit allocation field may be included in the common field.

[0146] Since the information / values ​​of the fields transmitted in each segment are different, the receiving device must receive both the EHT-SIG1 field for the primary 160 MHz and the EHT-SIG2 field for the secondary 160 MHz. For this reason, the receiving device must know in advance the channel (not punctured) that can receive the preamble in the secondary 160 MHz bandwidth. For this reason, the information of the channel that can receive the EHT-SIG2 field must be signaled to the receiving device in advance, and may be signaled in the BW field of the U-SIG field or in a field that appears after the BW field (the primary 160 MHz preamble is received in the primary 20 MHz).

[0147] When the proposed secondary 160 MHz signaling scheme is not applied, the 160 MHz signaling described below (160 MHz discontinuous channel configuration information) may appear twice in the EHT-SIG to signal puncturing mode for BWs greater than 160 MHz.

[0148] FIG. 17 illustrates an example of non-contiguous channels separated by frequency segments in accordance with one embodiment of the present invention.

[0149] FIG. 17 shows permissible 80 MHz bandwidth non-contiguous channel configurations and signaling schemes when restrictions on non-contiguous channel configurations are applied.

[0150] As shown in Fig. 17, mode 0 is a contiguous channel type in which no puncturing is applied to the 80 MHz bandwidth and the entire BW is used. Mode 1 is a discontinuous channel type in which only the secondary 20 MHz of the 80 MHz bandwidth is punctured, and the punctured position may change depending on the position of the primary 20 MHz in the 80 MHz bandwidth, as in the two cases of mode 1 (left and right reversible). Since the receiving device knows the positions of the primary 20, secondary 20, and secondary 40 MHz, it can confirm the discontinuous form of the 80 MHz BW from mode 1 signaling, which means that the secondary 20 MHz has been punctured.

[0151] Modes 2 and 3 can signal a discontinuous channel configuration in which one 20 MHz subchannel of the secondary 40 MHz is punctured. For example, the AP can include the punctured discontinuous channel configuration in a bitmap format in a U-SIG or EHT-SIG and transmit it to the receiving device.

[0152] Two modes are required to separate the punctured 20 MHz of the secondary 40 MHz. Modes 4 and 5 signal a discontinuous channel configuration in which one 20 MHz of the secondary 20 MHz and one of the secondary 40 MHz are punctured, and two modes are assigned to separate the punctured 20 MHz of the secondary 40 MHz together with the secondary 20 MHz.

[0153] FIG. 18 illustrates an example of a discontinuous channel for a single user transmission according to one embodiment of the present invention.

[0154] Referring to FIG. 18, when the total bandwidth is 160 MHz, a form of discontinuous channels punctured by punctured channels may be allowed.

[0155] Specifically, when the discontinuous channel type definition method is applied, the discontinuous channel types of 160 MHz BW that are allowed may be as shown in Mode 0 to Mode 5 in FIG. 18. For example, Mode 0 is a type of continuous channel in which puncturing is not applied in the 160 MHz bandwidth and the entire bandwidth is used. Mode 1 is a type of discontinuous channel in which only the secondary 40 MHz of the 160 MHz BW is punctured, and may change to the two cases of Mode 1 (left and right inversion possible) depending on the position of the primary 20 MHz of the 160 MHz BW. Since the receiving device knows the positions of the primary 20, secondary 20, secondary 40, and secondary 80 MHz, the discontinuous type of 160 MHz BW can be confirmed by the mode 1 signaling that means that the secondary 40 MHz is punctured. Modes 2 and 3 signal a discontinuous channel type in which one 40 MHz subchannel of the secondary 80 MHz is punctured, and two modes are required to distinguish the punctured 40 MHz of the secondary 80 MHz. Modes 4 and 5 signal a discontinuous channel configuration in which one 40 MHz of the secondary 40 MHz and one of the secondary 80 MHz are punctured, and two modes are allocated to separate the punctured 40 MHz of the secondary 80 MHz together with the secondary 40 MHz.

[0156] In this way, puncturing modes 0 to 5 may be expressed as the same signaling because they signal the same type of discontinuous channels except for the different total bandwidths (80 MHz and 160 MHz). The receiving device can confirm the total bandwidth and the type of discontinuous channels by combining the value of the BW field (80 or 160, 240, or 320 MHz) with the mode information.

[0157] FIG. 19 illustrates an example of discontinuous channels for a particular bandwidth in accordance with one embodiment of the present invention.

[0158] Referring to FIG. 19, when the total bandwidth for transmission of PPDUs is equal to or greater than 160 MHz, the discontinuous channels may be configured in a specific manner.

[0159] As shown in Figure 19, mode 6 indicates a discontinuous channel configuration in which the secondary 20 MHz and secondary 40 MHz are punctured, while mode 7 indicates a discontinuous channel configuration in which only the secondary 20 MHz is punctured out of the 160 MHz BW.

[0160] The discontinuous channel configurations from mode 0 to mode 7 above are signaled using three bits, and signaling for BWs over 160 MHz (80+160, 160+80, 160+160) is performed by signaling the puncturing modes for the primary 80 MHz or 160 MHz and the secondary 80 or 160 MHz, respectively, as described in FIG. 16. That is, at least one field of the PPDU transmitted in each segmented bandwidth may contain different information / content. In other words, the U-SIG field and / or EHT-SIG field transmitted in each segment may indicate different values ​​in the same field. For example, the PPDU transmitted in each segment may include a specific field including an indicator for indicating a puncturing pattern associated with a different puncturing mode. The puncturing pattern may indicate the channels punctured by the puncturing mode in a bitmap format.

[0161] FIG. 20 shows an example of a PPDU format for an extremely high throughput (EHT) wireless LAN according to an embodiment of the present invention.

[0162] Referring to FIG. 20, the PPDU of the EHT WLAN may have different configurations of fields included depending on the type of PPDU, the number of terminals to which the PPDU is transmitted, and whether or not OFDMA is applied.

[0163] Specifically, Fig. 20(a) shows an example of a PPDU format for single / multiple user transmission, Fig. 20(b) shows an example of a Trigger Based (TB) PPDU format, which is a PPDU initiated by a trigger frame, and Fig. 20(c) shows an example of an HE PPDU format based on 802.11ax.

[0164] Referring to Fig. 20(a), the SU / MU PPDU for single / multiple user transmission can include a Legacy Short Training field (L-STF), a Legacy Long Training field (L-LTF), a Legacy Signal field (L-SIG), and a Repeated Legacy Signature field (RL-SIG). These four fields are legacy fields that are also included in the 11ax PPDU format in Fig. 20(c).

[0165] The U-SIG field is a new field introduced in 11be, which is an EHT communication standard, and is a field commonly included in subsequent generations of 802.11 standard PPDUs including 11be. The U-SIG (Universal SIG) field may continue to be included in EHT PPDUs and subsequent generations of WLAN PPDUs, and plays a role in identifying which generation of PPDU it is, including 11be. The U-SIG field may be composed of two OFDM symbols based on 64FFT, and can transmit a total of 52 bits of information. Some fields included in the U-SIG field may be analyzed differently depending on the type of PPDU, the presence or absence of multi-user transmission, and the presence or absence of OFDMA transmission, and will be described in detail using the embodiment of FIG. 22.

[0166] For example, the configuration of fields included in the EHT-SIG field may change depending on the value of at least one field included in the U-SIG field of the SU / MU PPDU.

[0167] The EHT-SIG field is functionally divided into an EHT-VD common field, an EHT-RU allocation field, and an EHT-user specific field, and some fields may be interpreted differently or omitted depending on the type of PPDU, the presence or absence of multi-user transmission, and the presence or absence of OFDMA transmission. For example, if the value of a field included in the U-SIG field indicates that OFDMA is not applied or indicates single-user transmission, the field for allocating resource units in the EHT-SIG field may be omitted and not included.

[0168] The EHT-VD common field and the EHT-RU allocation field can be collectively called the EHT common field. The configuration and modified (compressed or omitted) form of the EHT-SIG field will be described in detail with reference to the embodiment of FIG.

[0169] Referring to FIG. 7(b), the EHT TB PPDU transmitted in response to the trigger frame may include only the U-SIG field after the legacy field, and may not include the EHT-SIG field. Therefore, unlike the MU / SU PPDU in which the U-SIG field includes information for decoding the EHT-SIG field, the U-SIG field may not include information for decoding the EHT-SIG field. The TB PPDU may be signaled including a spatial reuse field and puncturing mode information indicating the presence or absence of puncturing of the RUs constituting the transmission bandwidth described above. The U-SIG configuration of the TB PPDU in FIG. 20(c) and a method of distinguishing it from SU / MU will be described in detail using the embodiment of FIG. 21.

[0170] FIG. 21 illustrates an embodiment of a U-SIG field of an EHT PPDU and fields constituting the U-SIG field according to an embodiment of the present invention.

[0171] Referring to FIG. 21, the type of PPDU may be distinguished based on the value of a specific field indicating the type of PPDU included in the U-SIG field, and the configuration of the EHT-SIG field may change depending on the value of a field included in the U-SIG field.

[0172] Specifically, Figure 21 (a) shows an example of the format structure of the U-SIG field included in the EHT PPDU, and 43 bits of the 52 bits of the U-SIG field, excluding 9 bits of CRC / tail, are roughly divided into a VI (Version Independent) field and a VD (Version Dependent) field. At this time, information that cannot be signaled due to the restriction of the number of bits among information that must be provided in the VD field may be signaled by the EHT-SIG. That is, some of the fields that should be included in the VD field may be included in the EHT-SIG field and transmitted, and in this case, the fields that should be included in the VD field included in the EHT-SIG field may be repeatedly transmitted for each certain frequency band.

[0173] The VI field maintains the current bit configuration, and even if a subsequent generation PPDU is defined, a current 11be terminal can obtain information about the PPDU using the VI field of the PPDU. To this end, the VI field is composed of a version identifier, UL / DL, TXOP, BSS color, and PPDU BW field. The version identifier field serves to distinguish between 11be and subsequent generation WLAN standards. In the case of 11be, the value of the version identifier field may be signaled as 000b. The UL / DL field is used to distinguish whether the PPDU is an uplink or downlink PPDU. The TXOP field means a transmit opportunity duration transmitted in the MAC header, but by adding it to the PHY header, it serves to infer the length of the TXOP containing the PPDU without decoding the MPDU, and may be assigned 7 bits or more.

[0174] The BSS color field means a BSS-specific identifier for identifying the BSS defined in 11ax, and has a value of 6 bits or more. The PPDU BW field indicates the bandwidth occupied by the PPDU, and the bandwidth indicated at this time may be the bandwidth value before preamble puncturing is applied. The PPDU BW field may be assigned 3 bits or more, and when 3 bits are assigned, it can signal 000b=20MHz, 001b=40MHz, 010b=80MHz, 011b=160(80+80)MHz, 100b=240(160+80, 80+160)MHz, and 101b=320(160+160)MHz.

[0175] The remaining 110b, 111b may be utilized to signal the BW (>320 MHz) of the subsequent standard and may be used in combination with a portion of the VD field of the subsequent standard to signal the bandwidth of the subsequent standard.

[0176] The VD field is a field that may change in the process of developing a subsequent standard, and may be changed in the process of introducing new technologies into each standard or improving signaling efficiency. The VD field of the 11be version has a configuration that changes depending on the PPDU type and includes a field for signaling the PPDU type. Therefore, the VD field can be divided into a PPDU type field and a PPDU type specification field whose configuration and interpretation change depending on the PPDU type field. In this case, the PPDU type field may be located before or after the PPDU type specification field, or between the fields that make up the PPDU type specification field. This embodiment will be described using an example in which the PPDU type field is located before the PPDU type specification field.

[0177] In the EHT, the type of PPDU may be classified into MU / SU PPDU and TB PPDU, and the PPDU type field may be configured with 1 bit for this purpose. In this case, the PPDU type field may distinguish between MU / SU PPDU and TB PPDU. Alternatively, the PPDU type field may be configured with 2 or more bits to distinguish between MU PPDU, SU PPDU, and TB PPDU individually. The present invention will be described taking the case where the PPDU type field is 1 bit.

[0178] Figure 21 (b) shows an example of a PPDU type specification field when the PPDU type field of the VD field indicates an MU / SU PPDU. The EHT-SIG MCS field is located after the U-SIG field, and indicates the MCS applied to the EHT-SIG field, and may be assigned 4 bits or more. The spatial reuse field may be used in the same sense as the spatial reuse field of 11ax.

[0179] The EHT-SIG compression field indicates whether the EHT-RU allocation field, which indicates the configuration of resource units that constitute the total bandwidth in which the PPDU is transmitted, is compressed (omitted) or not, and is assigned 1 or 2 bits. In a 1-bit embodiment, 0 means that the EHT-RU allocation field is not compressed and appears, and 1 can indicate that the EHT-RU allocation field is compressed and not included in the EHT-SIG field.

[0180] When the EHT compression field is 2 bits, 00b means that the EHT-RU allocation field is not compressed and appears, 01b means compression mode 1, 10b means compression mode 2, etc. In addition, the EHT-SIG compression field signals whether the corresponding PPDU is an OFDMA MU PPDU to which OFDMA is applied. In the case of an OFDMA-applied MU PPDU, the EHT-RU allocation field cannot be compressed because an RU must be assigned to each STA. Therefore, the STA can recognize whether the received PPDU is an OFDMA-applied MU PPDU by checking whether the EHT-RU allocation field is compressed by the EHT-SIG compression field. In addition, even if OFDMA is not applied and the MU PPDU is a RU, the RU is configured with the same number of tones (or frequency band), so there is no need to transmit a separate RU allocation field indicating the configuration of the RU to the STA. Therefore, in this case, the EHT-SIG compression field can indicate that the EHT-SIG field does not include an RU allocation field.

[0181] The Number Of EHT-SIG Symbols Or MU-MIMO Users field is allocated 4 bits or more and may be used to signal the length of the EHT-user specific field and to decode the EHT-user specific field. The Number Of EHT-SIG Symbols Or MU-MIMO Users field indicates the number of MU-MIMO users (i.e., STAs) when the EHT-SIG compression field is not 0, i.e., when the compressed mode is applied, and indicates the number of symbols constituting the EHT-SIG field when the EHT-SIG compression field is 0, i.e., when the compressed mode is not applied. In this case, if the number of MU-MIMO STAs or users indicated by the field means 1, it indicates that the PPDU is a SU PPDU.

[0182] The bits allocated to two different fields, the Number of EHT-LTF Symbols and Midamble Periodicity field and the NSTS and Midamble Periodicity field, overlap and indicate information depending on whether the PPDU is a SU PPDU or not.

[0183] That is, depending on the type of PPDU, the number of EHT-LTF symbols and midamble periodicity field or the NSTS and midamble periodicity field may be included. In a 1-bit embodiment, if the value of the EHT-SIG Compression field is 1 and the number of MU-MIMO users is 1, the receiving device recognizes the received PPDU as a SU PPDU and recognizes the bit as the NSTS and midamble periodicity field. If the EHT-SIG Compression field is 0 or the value of the Number Of EHT-SIG Symbols Or MU-MIMO field does not mean 1 symbol or the number of MU-MIMO users is not 1, the receiving device recognizes the received PPDU as a MU PPDU and recognizes the bit as the number of EHT-LTF symbols and midamble periodicity field.

[0184] 21(c) shows an example of the format of the PPDU type specification field when the PPDU type field of the VD field indicates that the received PPDU is a TB PPDU, which consists of only a spatial reuse field and a puncturing mode field.

[0185] The spatial reuse field may be analyzed together with the value of the bandwidth field, and signals the bands that can be spatially reused among the total bandwidth indicated by the bandwidth field, and the transmit power limit when spatial reuse is applied. If the BW field means 20 MHz, the spatial reuse field signals whether spatial reuse is possible for the band and the transmit power limit. If the bandwidth field means 40 MHz, the spatial reuse 1 field signals whether spatial reuse is possible for the first 20 MHz, and the spatial reuse 2 field signals whether spatial reuse is possible for the second 20 MHz, and the transmit power limit.

[0186] If the Bandwidth field means 80, 160, 240, 320 MHz, the Spatial Reuse 1, 2, 3, 4 fields respectively signal the availability of spatial reuse and the transmit power limit for ¼ of the bandwidth (40 MHz for 160 MHz, 80 MHz for 320 MHz).

[0187] The puncturing mode field signals the puncturing mode generated when performing uplink MU OFDMA in the TB PPDU, and the STAs and APs of neighboring BSSs can obtain additional information required for spatial reuse using the puncturing mode information of the UL PPDU they received. The PPDU form combined with the UL MU OFDMA transmission (final form received by the AP) may differ from the form signaled by the puncturing mode of the TB PPDU, since no actual uplink transmission occurs in some bandwidths depending on the CCA result of the UL STA (final form received by the AP).

[0188] FIG. 22 illustrates an example for an EHT-SIG in uncompressed form according to one embodiment of the present invention.

[0189] The EHT-SIG in Figure 22 (a) is used for OFDMA MU PPDU, and includes a common field, a RU allocation field, and a user-specific field. The names of each field in the EHT-SIG field may vary, and the field classification may not be specified.

[0190] FIG. 22(b) shows an example of a format of a common field included in an EHT-SIG field. The common field may include at least one field that was not included due to the bit size limitation of the VD field of the U-SIG field. For example, the common field may include fields that are the same as or have the same function as fields that appeared in the HE-SIG-A field of 11ax, such as an LDPC Extra Symbol Segment, STBC, Pre-FED Padding Factor, GI-LTF Size, and / or Doppler, and may be assigned the same or more bits as the same field of 11ax. The EHT-SIG common field may be composed of one symbol, and therefore, the EHT-SIG common field may be assigned 26 bits and may be coded with MCS 0.

[0191] The Number of RU Allocations field signals the number of RU allocations in the EHT-SIG RU Allocation field in Figure 22(c) and may be 4 or 3 bits. The Number of RU Allocations field is necessary because, unlike 11ax, the 11be RU allocation subfields do not appear as fixed numbers depending on the bandwidth.

[0192] In the case of 11ax, when the PPDU bandwidth is 40 MHz or less, one RU allocation field appears in each of content channels 1 and 2, when the PPDU bandwidth is 80 MHz, two appear in each of content channels 1 and 2, and when the PPDU bandwidth is 160 (80 + 80) MHz, four appear in each of content channels 1 and 2. On the other hand, the RU allocation field of 11be does not have a fixed number of RU allocation fields depending on the PPDU bandwidth in each content channel, but may include a variable number of RU allocation fields depending on the RU configuration and combination within the bandwidth.

[0193] When 4 bits are allocated to the Number of RU Allocation field, the value of the Number of RU Allocation field may be 0000 (=1-0) to signal that there is one RU allocation field in the EHT-SIG RU allocation field. In a 4-bit embodiment, the value of the Number of RU Allocation field may be 1111 (=16-1) to signal that there are 16 RU allocation fields in the EHT-SIG RU allocation field. The Number of RU Allocation field indicates the number of RU allocation fields of the content channel that contains the Number of RU Allocation field. Thus, the Number of RU Allocation field may appear differently in each content channel when the number of RU allocation fields appearing in different content channels is different.

[0194] 22(c) shows an example of the format of the EHT-SIG RU allocation field. The EHT-SIG RU allocation field appears only in the OFDMA MU PPDU, and may be compressed and not appear in the EHT-SIG field of the SU PPDU, TB PPDU, or Full BW MU-MIMO.

[0195] The RU allocation field may be assigned 8 or more bits. The EHT-SIG RU allocation field may include N RU allocation fields, where N may be indicated by a number of RU allocation fields that appear before the EHT-SIG RU allocation field. The N RU allocation fields may appear early in the EHT-SIG RU allocation field in order, including the RU with the lowest frequency among the RUs included in each RU allocation field.

[0196] As an example of the order in which fields may appear in the RU allocation field, assume that four RU allocation fields signal subfield#1=[-1012:-771&-495:-254] (two 242 tone RUs), subfield#2=[-770:-529] (242 tone RUs), subfield#3=[12:529&770:1012] (484 tone RU, 242 tone RU), and subfield#4=[-253:-12&529:770] (two 242 tone RUs). In this case, subfield#1 with an RU at -1012 may appear first in the RU allocation field, subfield#2 with an RU at -770 may appear second, subfield#4 with an RU at the next lowest frequency -253 may appear third, and subfield#3 with the lowest frequency of RUs, 12, may appear last in the RU allocation field.

[0197] The RU allocation field signals a small RU configuration within 20 MHz composed of RUs of 26, 52, and 106 tone sizes, and can include a 78 (26+52 or 52+26) tone RU in which RUs with 26 and 52 tone RUs appearing consecutively are allocated at once, and a 132 (26+106 or 106+26) tone RU in which RUs with 26 and 106 tone RUs appearing consecutively are allocated at once. In addition, the RU allocation subfield can signal a large RU having a size of 242 tones or more, and can signal the RU combinations and positional relationship of the constituent RUs that make up each large RU in order to signal the combinations and positions of large RUs that are discontinuously located. The RU configuration and allocation method signaled using the RU allocation subfield will be described using the embodiment of FIG. 23. The Center 26 RU field indicates whether one, two, or four Center 26-tone RUs are used, which are located at 80, 160, and 320 MHz, respectively, and may be assigned one or more bits, and may not appear compressed when the PPDU BW is 40 MHz or less. In a one-bit embodiment, the Center 26-tone RU field of the 80 MHz PPDU indicates whether a Center 26-tone RU located in the middle of the 80 MHz is used, and the same value (e.g., 1) appears in the Center 26-tone RU field of all EHT-SIG content channels. When the value of the Center 26-tone RU field is 1, a field indicating the STA to which the Center 26-tone RU is assigned may be included in the EHT-SIG user identification field of FIG. 22(d). In a 1-bit embodiment, the central 26-tone RU field of the 160 MHz PPDU is repeated in each of the two EHT-SIG content channels, and the central 26-tone RU field of content channel 1 indicates whether or not the central 26-tone RU of 80 MHz located at a relatively low frequency is used, and the central 26-tone RU field of content channel 2 can indicate whether or not the central 26-tone RU of 80 MHz located at a relatively high frequency is used.As a one-bit embodiment, when four channels are used for 240 MHz and 320 MHz PPDU, the central 26-tone RU fields present in content channels 1, 2, 3, and 4 can respectively indicate whether or not the first, second, third, and fourth (in descending frequency order) central 26-tone RUs are used.

[0198] In a 2-bit embodiment, a 2-bit central 26-tone RU field may appear in content channel 1 and content channel 2 to signal whether or not the four central 26-tone RUs present in the 320 MHz PPDU are in use. The 2-bit central 26-tone RU field in content channel 1 may have values ​​such as 00, 01, 10, and 11 to signal whether or not the first and second or first and third central 26-tone RUs are in use on a low frequency basis. The 2-bit in content channel 2 may indicate whether or not the third and fourth or second and fourth central 26-tone RUs are in use. For example, when the 1-bit central 26-tone RU field is signaled as 1 (in use), one EHT-SIG user specific field appears to indicate the STA to which the central 26-tone RU is assigned to the content channel. Or, when the 2-bit central 26-tone RU field is signaled as 11, the EHT-SIG user specific fields of the two STAs to which the central 26-tone RUs are assigned to the content channel appear.

[0199] Figure 22(d) shows an example of an EHT-SIG user specific field. The basic function of the EHT-SIG user specific field may be used in the same way as the HE-SIG-B user specific field of 11ax, and each field included in the EHT-SIG user specific field may be used in the same way as the corresponding field of 11ax. However, 4 bits are allocated to the NSTS to signal 16 streams.

[0200] In addition to the elements depicted in the embodiment of Figure 22(d), in order to signal one or more RUs in a single user-specific field, an additional RU indicator field may be included to indicate whether there are further RUs allocated in addition to the RU corresponding to the user-specific field. If the additional RU indicator field indicates that there are further RUs allocated to the receiving device, the receiving device checks the user-specific fields located after the user-specific field to check the additional RUs allocated to its STA-ID.

[0201] FIG. 23 illustrates an example of a resource unit configuration using fields for allocating resource units according to an embodiment of the present invention.

[0202] Referring to FIG. 23, a terminal may be assigned multiple RUs, and the assigned multiple RUs may have different numbers of tones or different frequency bands.

[0203] Specifically, Figure 23(a) shows an example of RU configuration within 20 MHz that may be indicated by the RU allocation field. In this embodiment, 26, 52, and 106 tone sizes are assumed to be basic small RUs, and 78 (26+52 or 52+26), 132 (26+106 or 106+26), and 158 (52+106 or 106+52) tone size RUs that can be configured by combining basic small RUs are defined as small RUs.

[0204] As an example of allocation of small RUs in a 20 MHz band, the RUs in the 20 MHz band may be signaled as nine 26-tone RUs, and each RU may be assigned to nine receiving devices. As another example, the 20 MHz band may be signaled as a combination of 26-tone RUs and 52-tone RUs, and then the receiving devices may be assigned one 26-tone RU and one 52-tone RU, or a specific receiving device may be assigned both 26-tone RUs and 52-tone RUs arranged consecutively. As another example, the 20 MHz band may be signaled as a combination of 26-tone RUs and 52-tone, 106-tone RUs, and then the receiving devices may be assigned one 26-tone RU, one 52-tone RU, and one 106-tone RU, or a specific receiving device may be assigned both 26-tone RUs and 106-tone RUs arranged consecutively. In this embodiment, the 106-tone size RU or consecutive 106+26-tone RUs (or 26+106-tone RUs) may be repeatedly assigned to one or more receiving devices by MU-MIMO. In this embodiment, in order to allocate a 78-tone RU and a 132-tone RU to a receiving device, the RU allocation field defines (includes) bit combinations meaning 78-tone RUs (26+52 or 52+26 form) and 132-tone RUs (26+106 or 106+26 form), or after signaling a combination of 26, 52, and 106-tone RUs and a 20 MHz bandwidth, two RUs may be allocated to the receiving device using a user-specific field.

[0205] Alternatively, to allocate two basic small RUs to a receiving device, the user-specific field of the receiving device corresponding to the first basic RU on a low frequency basis may further signal whether or not the next basic small RU located adjacent to the first basic RU is in use (allocated). Alternatively, to signal whether or not the next small RU located adjacent to the first basic RU is in use, the user-specific field may include an additional RU indicator field consisting of 1 bit.

[0206] Figure 23(b) shows the configuration of RUs of 20 MHz or more that can be specified by the RU allocation field. In Figure 23(b), 242-tone RUs, 484-tone RUs, 996-tone RUs, 996x2-tone RUs, 996x3-tone RUs, and 996x4-tone RUs can be defined as basic large RUs, and 242+484-tone RUs, 242+996-tone RUs, 484+996-tone RUs, 484+996x2-tone RUs, 484+996x3-tone RUs, and 996x4-tone size RUs that can be configured by combinations of basic large RUs can be defined as large RUs.

[0207] As an example of large RU allocation of 20 MHz or more, after signaling 20 MHz (242 tone size) RU in RU allocation field, one or more user specific fields corresponding to RU allocation field can be signaled to allocate 20 MHz RU to one or more receiving devices. Or, allocation of 40, 80, 160, 240, 320 MHz (484, 996 (or 484+484), 996x2, 996x3, 996x4 tone respectively) RU can be performed in the same manner as allocation of 20 MHz RU. Also, to signal large RU other than basic large RU, RU allocation field can include bit combinations that mean 242+484 tone RU, 242+996 tone RU, 484+996 tone RU, 484+996x2 tone RU, 484+996x3 tone RU.

[0208] An example of a 60 MHz RU configuration is shown in Figure 23(c). As an example of a 60 MHz RU allocation, the RU allocation field divides the RU into four types of 242+484 tone RUs according to the position of the excluded 20 MHz band among the four 20 MHz bands (when the 80 MHz band is divided into four 20 MHz bands) in order to signal 242+484 tone RUs (60 MHz size) located across the 80 MHz band. In this case, the excluded 20 MHz may be a band allocated to another device.

[0209] For example, a 484+242 tone RU may be allocated for transmitting an 80 MHz EHT PPDU to which OFDMA is not applied. The 484+242 tone RU can be obtained by puncturing one of four 242 tone RUs in the 80 MHz EHT PPDU. The data subcarriers of the 484+242 tone RU are composed of the data subcarriers of the 484 tone and 242 tone RUs that make up the 484+242 tone RU.

[0210] That is, a 484+242 tone RU may be constructed by puncturing one of the four 242 tone RUs allocated for the 80 MHz EHT PPDU. In this case, the 484 tones may be constructed of two 242 tone RUs, with the punctured 242 tone RU located in the middle.

[0211] Alternatively, when some of the four 242-tone RUs in the EHT PPDU are assigned to other terminals, the terminal may be assigned 484+242 RUs. That is, when two terminals receive an 80 MHz EHT PPDU, if one of the two terminals is assigned one 242-tone RU, the remaining terminal may be assigned discontinuous multiple RUs of 484+242 tones.

[0212] FIG. 23(d) shows an example of a 120 MHz RU configuration. As a 120 MHz RU allocation example, the RU allocation field can divide the RU into four types of 484+996 tones according to the location of the excluded 40 MHz band among the four 40 MHz bands (when the 160 MHz band is divided into four 40 MHz bands) to signal a 484+996 tone RU (120 MHz size) located across a 160 (or 80+80) MHz band. In the same manner as the 60 and 120 MHz RU examples described above, a 140 MHz RU configuration within the 160 MHz bandwidth, a 220, 200 MHz RU configuration within the 240 MHz bandwidth, and a 280, 240 MHz RU configuration within the 320 MHz bandwidth may be indicated according to the size and location of the excluded band.

[0213] Using the RU allocation field described in the embodiment of Figure 23, even if two consecutive basic small RUs are allocated or a large RU consisting of two or more basic large RUs is allocated, the user-specific field for a single receiving device may be included only once in one content channel among all content channels.

[0214] For example, 996+484 tone RUs may be allowed in a 160 / 80+80(TBD)MHz EHT PPDU where OFDMA is not applied. 996+484 tone RUs can be obtained by puncturing one of the four 484 tone RUs in the 160 / 80+80(TBD)MHz EHT PPDU. That is, similar to a 484+242 tone RU, a 996+484 tone RU may be configured by puncturing one of the four 484 tone RUs allocated for an 80MHz EHT PPDU. In this case, the 996 tones may be configured with two 484 tone RUs, with a punctured 484 tone RU in the middle.

[0215] A data subcarrier for a 996+484 tone RU may be composed of data subcarriers for 996 tones and 484 tones RUs that make up a 996+484 tone RU.

[0216] That is, instead of only a single RU being assigned to a STA, multiple RUs may be assigned, and in this case, the number of tones (or frequency bands) of the assigned RUs may be different from each other. In this case, RUs with different numbers of tones can be obtained by puncturing a specific RU in the middle of consecutive RUs.

[0217] FIG. 24 illustrates an example of an EHG-SIG field when a non-OFDMA PPDU according to an embodiment of the present invention is applied.

[0218] 24(a) shows an example of the format of an EHT-SIG field included in a non-OFDMA MU PPDU to which OFDMA is not applied. As shown in FIG. 24(a), the EHT-SIG field of a non-OFDMA MU PPDU is different from the EHT-SIG field of an OFDMA MU PPDU to which OFDMA is applied, in that the EHT-SIG RU allocation field is compressed and does not need to be included in the EHT-SIG field.

[0219] That is, the EHT-SIG RU allocation field may be included in the EHT-SIG field when the compression field included in the U-SIG indicates that no compression mode is applied (uncompressed mode), in which case the EHT-SIG RU allocation field may be included in all of at least one content channel included in the EHT-SIG field.

[0220] Specifically, whether the RU allocation field is included in the EHT-SIG field is signaled by the EHT-SIG compression field in the U-SIG field. Since the non-OFDMA MU PPDU does not apply OFDMA and the MU PPDU is transmitted to all receiving devices using the same RU, no individual RU allocation is performed for each receiving device.

[0221] However, only the form in which puncturing (preamble puncturing) is applied is signaled within the PPDU bandwidth signaled in the U-SIG field, and the receiving device can recognize the form (RU configuration) of the MU-PPDU. That is, when a non-OFDMA PPDU to which OFDMA is not applied is transmitted, the U-SIG field can include a puncturing channel information field indicating the pattern of punctured RUs in the entire bandwidth in which the PPDU is transmitted. When the STA receives a non-OFDMA PPDU from the AP, the STA can recognize the punctured RUs in the entire bandwidth in which the PPDU is transmitted according to a specific field (puncturing channel information field) included in the U-SIG field of the non-OFDMA PPDU, and can receive the non-OFDMA PPDU in RUs other than the punctured RUs. In this case, the puncturing channel information field can indicate the pattern of punctured RUs to the STA in a bitmap format.

[0222] The EHT-SIG field of the non-OFDMA PPDU includes 2 to 16 user specific fields, each of which includes a different STA-ID of a receiving device. The user specific fields may be configured with a user block field including a CRC and a tail in units of two, and the last user block field may be configured with one user specific field, a CTC, and a tail.

[0223] FIG. 24(b) shows an example of EHT-SIG common field #1 of non-OFDMA MU PPDU. The EHT-SIG Common #1 field included in the non-OFDMA MU PPDU has a puncturing mode field, and the puncturing mode field may appear in all or part of the bits allocated to the RU allocation number field of the EHT-SIG Common field included in the OFDMA PPDU. In one embodiment, the puncturing mode field may be signaled by allocating 3 bits out of the 4 bits of the RU allocation number subfield of the OFDMA PPDU EHT-SIG common field. The remaining bit may appear as a reserved field or may not appear as compressed.

[0224] The puncturing mode field signals the discontinuous form (puncturing mode) of the RUs of the channel in which the non-OFDMA PPDU is transmitted among the entire bandwidth indicated by the bandwidth field of the U-SIG field. The signaling may be performed using a defined puncturing mode, or the entire bandwidth or the bandwidth excluding the primary 20 MHz may be divided into specific frequency domain units (20, 40, 80 MHz) and signaled in a bitmap.

[0225] Using the bandwidth field of the U-SIG field, the RU allocation field of the EHT-SIG field, and the puncturing mode field, the receiving device can recognize the RU combination within which it must receive the PPDU. That is, the STA can recognize the entire bandwidth in which the PPDU is transmitted by the bandwidth field included in the U-SIG, and can recognize the punctured RUs in the entire bandwidth by the puncturing mode field. In this case, if OFDMA is not applied, the RU allocation field may be omitted because the RUs for the MU-MIMO STA are divided equally. However, if OFDMA is applied, the RU allocation field may be included in the common field of the EHT-SIG field to instruct the terminal to configure the RUs to allocate RUs to each terminal, and the STA can recognize the RU configuration by the RU allocation field.

[0226] In this way, the STA can recognize the RU to which the PPDU is actually transmitted by the bandwidth field and the puncturing mode field. The remaining fields except for the puncturing mode field have the same configuration and function as the fields constituting the OFDMA MU PPDU EHT-SIG common field.

[0227] 24(c) shows an example of an EHT-SIG user-specific field #1 of a non-OFDMA MU PPDU. In the EHT-SIG user-specific field #1 of a non-OFDMA MU PPDU, user-specific fields of devices receiving a PPDU using discontinuous channels signaled by the bandwidth field of the U-SIG field and the puncturing mode field of the EHT-SIG common field may appear as many as the number of MU-MIMO users that can be served.

[0228] Therefore, in the case of 11be, since 16 antennas are planned to be used, the EHT-SIG user-specific #1 field of the non-OFDMA MU PPDU may contain a minimum of 2 and a maximum of 16 user-specific fields containing the STA-IDs of different receiving devices.

[0229] The STA-ID field may include a STA-ID for identifying a receiving device that is to receive the non-OFDMA MU PPDU, and may be allocated 11 bits. The MCS field indicates the modulation and coding scheme applied to the data field of the receiving device corresponding to the STA-ID, and may be allocated 4 bits. The Coding field is allocated 1 bit and may be represented as 0 or 1 to indicate the coding scheme used, either BCC or LDPC. The Spatial Configuration field indicates the number of MU-MIMO spatial streams allocated to the receiving device corresponding to the STA-ID, and may be allocated 4 bits.

[0230] FIG. 25 illustrates an example of an EHT-SIG field when a single user (SU) PPDU according to an embodiment of the present invention is applied.

[0231] Referring to FIG. 25, when the type of the PPDU is a SU PPDU, some of the fields of the MU PPDU may be omitted.

[0232] Specifically, FIG. 25(a) shows an example of an EHT-SIG field of a SU PPDU, and the EHT-SIG field of the SU PPDU may not include a compressed RU allocation field, as in the case of a non-OFDMA MU EHT-SIG. The user-specific field of the SU PPDU may include one EHT-SIG user-specific field #2. Specifically, in the case of a SU PPDU, the EHT-SIG field may include a field that cannot be included due to the size constraint of the U-SIG field and a specific field indicating the number of MU-MIMO users (e.g., an EHT-SIG symbol or a number field of MU-MIMO users). In this case, if the value of the specific field indicates that the number of STAs (or the number of users) is 1, the type of the PPDU may be SU PPDU, and if the value of the specific field indicates that the number of STAs is 2 or more, the type of the PPDU may be MU PPDU, and the number of user fields included in the user-specific field may be determined according to the number of STAs.

[0233] In the case of SU PPDU, since the number of STAs participating in MU-MIMO is 1, the user-specific field may include one user field.

[0234] 25(b) shows an example of an EHT-SIG common field #1 of a SU PPDU. The SU PPDU EHT-SIG common field #1 may have the same field configuration and function as the non-OFDMA EHT-SIG common field #1. The puncturing mode field of the SU PPDU EHT-SIG common field #1 may indicate the same mode as the puncturing mode field of the non-OFDMA EHT-SIG common field #1, or may indicate a form in which some modes are removed / added / changed.

[0235] FIG. 25(c) shows an example of the EHT-SIG user specific field #2 of the SU PPDU. In the case of the SU PPDU, one EHT-SIG user specific field may be included. The STA-ID field may include a STA-ID for identifying a receiving device that should receive the SU PPDU, and 11 bits may be allocated to the MCS field. The coding MCS of the SU PPDU may be included, and 4 bits may be allocated to the MCS field. The coding field may be allocated 1 bit and may be indicated as 0 or 1 to indicate the coding scheme used, either BCC or LDPC. The reserved field may be added to have the same size and structure as the EHT-SIG user specific field of other PPDUs, that is, OFDMA MU PPDU and non-OFDMA MU PPDU, or may be compressed and not included.

[0236] When the reserved field is included, the bits allocated to the reserved field may be utilized to improve the puncturing resolution of the SU PPDU. For example, the puncturing mode field of the EHT-SIG common field may appear again in the reserved field, and the puncturing mode field of the common field and the puncturing mode of the user specific field may indicate the primary 160 MHz and secondary 160 MHz discontinuous channel configurations, respectively.

[0237] As another example, the puncturing mode of the common field and the puncturing mode of the user specific field are combined, and the RU discontinuity in the bandwidth can be indicated by an 8-bit bitmap. In this case, each of the bandwidths corresponding to 1 / 8 of the entire bandwidth may correspond to one bit, and the bit (the first bit) corresponding to the area including the primary 20 MHz may correspond to the bandwidth excluding the primary 20 MHz. As an example of an 8-bit bitmap indicating a discontinuity in the 160 MHz bandwidth, each 20 MHz of the 160 MHz corresponds to one bit, and the 8-bit bitmap can be indicated as 00110000 or 11001111 to indicate that the secondary 40 MHz is punctured. As an example of the 8-bit bitmap, 1000 0000 or 0111 1111 may be signaled as an 8-bit bitmap to signal that only the secondary 20 MHz channel is punctured in the 320 MHz BW.

[0238] In this case, the first bit of the 8-bit bitmap representing 320 MHz corresponds to the secondary 20 MHz, the second bit corresponds to the secondary 40 MHz, and the third bit corresponds to the 40 MHz corresponding to the lower frequency of the secondary 80 MHz. As another embodiment of the 8-bit bitmap, 0100 0000 or 1011 1111 may be signaled as an 8-bit bitmap to signal that the secondary 40 MHz channel is punctured in the 320 MHz BW. In the embodiment of the 8-bit bitmap, the BW region corresponding to each bit may be determined in ascending order of frequency or in accordance with the positional relationship with the primary 20 MHz.

[0239] FIG. 26 illustrates an example of large RU allocation according to an embodiment of the present invention.

[0240] FIG. 26(a) shows an example of the size and configuration (combination) of discontinuous large RUs for transmission of an OFDMA-applied MU PPDU when the total bandwidth for PPDU transmission is 320 MHz. In FIG. 26(a), the OFDMA MU PPDU may be assigned to the receiving device as a single RU or a combination of 12 discontinuous RUs within a bandwidth of 320 MHz. RU#1 including the lowest frequency may be signaled as a 20+40 MHz RU in which the second 20 MHz RU is excluded within 80 MHz, and may be located in the first RU assignment field of the RU assignment field, as shown in FIG. 26(b). RU#2 including the second lowest frequency may be signaled as a 20 MHz (242 tone size) RU, and may be located in the second RU assignment field. RU#3 including the third lowest frequency may be signaled as an 80 MHz (996 tone size) RU, and may be located in the third RU assignment field. RU#4, which includes the fourth lowest frequency, may be signaled as an 80+40MHz RU with the third 40MHz excluded within 160MHz, and may be located in the fourth RU allocation field. RU#5, which is located at the highest frequency, may be signaled as a 40MHz (484 tone size) RU, and may be located in the last field. Since the above embodiment includes five RU allocation fields, the RU allocation number subfield of the EHT-SIG common field may be set to a value indicating 5, as shown in FIG. 26(c).

[0241] FIG. 27 illustrates an example of single content channel signaling for an OFDMA MU PPDU according to an embodiment of the present invention.

[0242] Figure 27 shows an example of signaling of a single content channel for the 320 MHz OFDMA MU PPDU in Figure 26. In Figure 27, it is assumed that MU-MIMO transmission is performed with #RU1 assigned to four receiving devices, and #RU2, 3, 4, and 5 assigned to two, five, three, and one receiving devices, respectively, simultaneously.

[0243] FIG. 27(a) shows an example of an RU allocation field for a single content channel. In order to signal that there are four receiving devices to which #RU1 is assigned, the first RU allocation field can signal a value obtained by subtracting 1 from the number of user-specific fields corresponding to the RU allocation field by using some of the bits assigned to the RU allocation field (#RU1). As an example of the RU allocation field (#RU1), the RU allocation field (#RU1) can have a value of xxx xxxx0011 (=4-1), and from xxx xxxx, the receiving device can know that the RU configuration is configured with a (20+40) MHz RU configuration excluding the second 20 MHz of 80 MHz, and from the last 4 bits, the receiving device can know that four user-specific fields corresponding to the RU are included. Same as the RU allocation field (#RU1), the RU allocation fields (#RU2, 3, 4, 5) appear as yyy yyyy 0001 (=2-1), zzz zzzz 0100 (=5-1), qqq qqqq 0010 (=3-1), ttt tttt 0000 (=1-1), and each RU allocation field can signal the configuration of the RU and the number of the corresponding user-specific fields. In the above embodiment, 7 bits except the last 4 bits of each RU allocation field indicate the configuration and position of the RU that each RU allocation field means.

[0244] FIG. 27(b) shows an example of a user-specific field for a single content channel. The user-specific fields appear in a number based on the total number of receiving devices signaled by each RU allocation field. Therefore, the receiving device can recognize that the STA-IDs appearing in the user-specific field #RU1_1, user-specific field #RU1_2, user-specific field #RU1_3, and user-specific field #RU1_4 are the IDs of the STAs using the RU (20+40MHz) indicated by the RU allocation field (#RU1). After receiving all the RU allocation fields, each receiving device can check the configuration and position of each RU in the entire BW by filling in the RU configuration signaled by the RU allocation field from the lowest frequency, and can check the STA-ID of the user-specific field that appears later to check the RU assigned to it.

[0245] FIG. 28 illustrates an example of two content channel signaling for a specific frequency band according to an embodiment of the present invention.

[0246] FIG. 28(a) shows an example of RU allocation fields included in two content channels. In FIG. 28(a), two content channels 1 and 2 may include RU allocation fields of the same RU configuration signaling zero or more receiving devices. Whether a content channel signals non-zero receiving devices for a single RU is determined by the transmitting device when the EHT-SIG field is configured to make the lengths of the two content channels similar. As an example, the RU allocation field (#RU1) appearing in content channel 1 may be signaled as xxx xxxx 0011 (=4-1), and the RU allocation subfield (#RU1') appearing in content channel 2 may have a bit combination that means the same RU configuration as #RU1 + Null user.

[0247] In Fig. 28(b), the two content channels appear in correspondence with the total number of receiving devices whose user-specific fields are signaled in the RU allocation field of each content channel. Therefore, in this embodiment, four user-specific fields for the RU allocation field (#RU1) of content channel 1 appear in content channel 1, and no user-specific field for the RU allocation field (#RU1') of common channel 2 appears in common channel 2. The reason why all RU allocation fields (#RU1, #RU1') for the same RU configuration appear in each content channel even though there is no user corresponding to the RU allocation field is to enable the receiving device to grasp the RU configuration and position of the entire BW even when decoding the RU allocation field that appears in one content channel.

[0248] FIG. 29 illustrates yet another example of two content channel signaling for a specific frequency band according to an embodiment of the present invention.

[0249] FIG. 29(a) shows another embodiment of the RU allocation field for two content channels.

[0250] As shown in Figure 29(a), RU allocation fields appear in content channel 2 for the same RU configuration, with the same number of receiving devices or the number of receiving devices differing by one. As an example, the RU allocation field (#RU1) appearing in content channel 1 is signaled as xxx xxxx 0001 (=2-1), and the RU allocation field (RU1) appearing in content channel 2 is also signaled as xxx xxxx 0001 (=2-1). As an example, the RU allocation field (#RU3) appearing in content channel 1 may be signaled as zzz zzzz 0010 (=3-1), and the RU allocation field (#RU3') may be signaled as zzz zzzz 0001 (=2-1).

[0251] FIG. 29(b) shows another example of user-specific fields included in two content channels. The user-specific fields appear in each content channel correspond to the total number of receiving devices signaled in the RU allocation field of each content channel 1. Therefore, in this embodiment, two user-specific fields for the RU allocation field (#RU1) appear in each of content channel 1 and content channel 2. In this embodiment, since the user-specific fields for each RU allocation field are included in content channels 1 and 2 and appear alternately, the EHT-SIG length is determined similarly between the two content channels, and as a result, padding for matching the lengths of both content channels can be reduced. In addition, since the RU allocation field indicating the same RU configuration appears in both content channels 1 and 2, the receiving device can grasp the RU configuration and position of the entire BW even if it decodes only the RU allocation field appearing in one content channel.

[0252] FIG. 30 illustrates yet another example of two content channel signaling for a specific frequency band according to an embodiment of the present invention.

[0253] FIG. 30 illustrates an example of two content channels for an OFDMA MU PPDU transmitted in 320 MHz, which is the total bandwidth for transmission of the PPDU described in FIG.

[0254] The embodiment of FIG. 30 splits 320 MHz into two 160 MHz and signals a single content channel for each 160 MHz, so that OFDMA MU PPDUs for 320 MHz may be signaled via two content channels.

[0255] Therefore, for understanding this embodiment, the omitted part can be replaced by applying the single content field embodiment of FIG. 27 to 160 MHz. This embodiment can be effective when 320 MHz (or 160 MHz) operation of 11be is performed by two 160 MHz (or 80+80 MHz) operations that are physically separated by a significant portion. The above embodiment can also be effective when 160+80 MHz operation is performed by 160 MHz operation and 80 MHz operation that are physically separated by a significant portion.

[0256] FIG. 30(a) shows another example of RU assignment fields included in two content channels and transmitted. In FIG. 30(a), two content channels 1 and 2 perform signaling of different 160 MHz. To this end, the EHT-SIG common field of this embodiment can transmit the RU assignment number subfield for the primary 160 MHz and the secondary 160 MHz, respectively. That is, starting from the EHT-SIG common field, the signaling of the primary 160 MHz and the secondary 160 MHz can have a structure in which they are separated. The RU assignment fields (#RU1, 2, 3) appearing in the content channel 1 all signal RUs composed of a combination of RUs included in the primary 160 MHz, and the RU assignment fields (#RU4, 5) appearing in the content channel 2 all signal RUs composed of a combination of RUs included in the secondary 160 MHz to the STA.

[0257] #RU1, 2, 3 may be arranged in the RU configuration order including the lower frequency in the primary 160, and #RU4, 5 may be arranged in the RU configuration order including the lower frequency in the secondary 160. Therefore, the receiving device can check the RU assigned to it after grasping only the RU configuration and position of the 160 MHz band where the user-specific field including its STA-ID appears.

[0258] Figure 30(b) shows yet another embodiment of user-specific fields included in two content channels, respectively. In the case of Figure 30(b), since the primary 160 MHz and secondary 160 MHz content channels have separate structures, padding for matching the lengths of content channels 1 and 2 may be omitted.

[0259] 31 and 32 show an example of four content channels for an OFDMA MU PPDU in a specific frequency band according to an embodiment of the present invention.

[0260] 31 and 32, when the total bandwidth for transmitting the PPDU described in FIG. 26 is 320 MHz, the OFMDA MU PPDU can include four content channels.

[0261] Specifically, FIG. 31 shows an example in which the embodiment for two content channels described in FIG. 28 is expanded to four content channels, and FIG. 32 shows an example in which the embodiment for two content channels described in FIG. 16 is expanded to four content channels.

[0262] FIG. 33 illustrates yet another example of four content channel signaling for a specific frequency band according to one embodiment of the present invention.

[0263] Figure 33 is an embodiment combined with the embodiments of Figures 29 and 30, in which four content channels may be included in the MU PPDU. Specifically, if the total bandwidth for the transmission of the PPDU is 320 MHz, the 320 MHz may be divided into two segments (primary 160 MHz and secondary 160 MHz). Each segment may include two content channels, and the two content channels may alternately include user-specific fields corresponding to RU allocation subfields.

[0264] FIG. 34 illustrates an example of how resource units of different sizes are configured according to an embodiment of the present invention.

[0265] Referring to FIG. 34, when the total bandwidth for PPDU transmission is 320 MHz and OFDMA is applied, an OFDMA MU PPDU may be composed of non-contiguous large RUs and small RUs.

[0266] Specifically, Figure 34(a) shows a large RU configuration similar to Figure 26(a) and a single 20 MHz RU that is split into seven small RUs that may be used for PPDU transmission. In Figure 34, #RU2 used as a small RU cannot be used for MU-MIMMO because the single RU is configured with fewer than 78 tones, and one 78-tone RU and six 26-tone RUs may each be assigned to a single receiving device.

[0267] FIG. 35 illustrates yet another example of a method for configuring resource units of different sizes according to an embodiment of the present invention.

[0268] FIG. 35 shows an example of the RU allocation field when RUs are allocated using the method described in FIG. 34 and two content channels are included in a PPDU and transmitted.

[0269] As shown in Fig. 35, content channels 1 and 2 may have the same large RU configuration and / or small RU configuration, with the number of receiving devices receiving the content channels being the same or differing by one. User-specific fields corresponding to RU allocation fields may be alternately included in two content channels and transmitted, and the order of inclusion may be alternating, starting from a content channel other than the content channel in which the last user-specific field of the previous RU allocation field appeared. For example, if the RU allocation field is located in an odd-numbered field in content channel 1, the RU allocation field may be located in an even-numbered field in content channel 2.

[0270] In this case, the user-specific fields for the first RU allocation field may be set to alternate positions starting from content channel 1 or 2.

[0271] Figure 35(b) shows yet another example of the format of the user-specific field when two content channels are included and transmitted as in Figure 34. The number of user-specific fields included in each content channel may be determined based on the sum of the number of receiving devices to which large RUs and small RUs of 106 tone size or more are assigned, set by the RU allocation field of each content channel, plus the number of small RUs of less than 106 tone size.

[0272] That is, the number of user-specific fields may be equal to the total number of receiving devices to which RUs are assigned.

[0273] Therefore, in FIG. 35, the user-specific fields corresponding to the RU allocation field (#RU1) signaling a large RU may include two and one for content channel 1 and content channel 2, respectively, and the user-specific fields corresponding to the RU allocation field (#RU2) signaling a small RU may include three and four for content channels 1 and 2, respectively.

[0274] FIG. 36 shows an example of an EHT-SIG repeated within a bandwidth when signaling a content channel according to one embodiment of the present invention.

[0275] Referring to FIG. 36, at least one content channel included in the EHT-SIG field may be repeatedly transmitted for each certain frequency band.

[0276] Specifically, FIG. 36(a) shows a first method (Option 1) for transmitting an EHT-SIG field including two content channels shown in FIG. 28 and FIG. 29. Specifically, in the first method according to FIG. 36(a), the same common field of the EHT-SIG field may be repeatedly transmitted every 20 MHz. That is, content channels 1 and 2 may be alternately transmitted every 20 MHz, and content channels 1 and 2 may include the same common field. The RU allocation field located after the common field may be transmitted by crossing different RU allocation fields 1 and 2 at adjacent 20 MHz. That is, content channels 1 and 2 may include different RU allocation fields.

[0277] User-specific fields 1 and 2 corresponding to RU allocation fields 1 and 2, respectively, may be repeatedly included in the content channel in which the corresponding RU allocation field is located.

[0278] FIG. 36(b) shows a second method (Option 2) for transmitting an EHT-SIG field containing the two content channels shown in FIG.

[0279] Specifically, in the second method of FIG. 36(b), the content channels transmitted in each segment of the total bandwidth in which the PPDU is transmitted may include a common field containing different information, and within each segment, the common field containing the same information may be repeatedly transmitted for a certain frequency band.

[0280] For example, if the total bandwidth for transmitting a PPDU is 320 MHz, it may be divided into two segments in units of 160 MHz. In this case, each of the two divided segments may be called a primary 160 and a secondary 160. The common fields included in the content channels transmitted by the primary 160 and the secondary 160 may contain different information, and in each 160 MHz segment, the same common field may be repeated every 20 MHz and transmitted in the content channel.

[0281] That is, if the total bandwidth is 160 MHz, the total bandwidth may be divided into two segments of 80 MHz. A specific field of the PPDU may contain different contents in each 80 MHz segment, and may contain the same contents every 20 MHz in each segment. For example, a common field of the U-SIG field or EHT-SIG field of the PPDU may contain different contents in the 80 MHz segment, and may contain the same contents every 20 MHz in each segment.

[0282] For example, the common field may appear in a different number signaled in the RU allocation number subfield in the primary 160 and secondary 160. Then, the RU allocation fields that appear are different RU allocation fields 1 and 2 that appear in the primary 160 and secondary 160 MHz, respectively, and each RU allocation field appears repeatedly every 20 MHz across 160 MHz. Each user-specific field corresponding to the RU allocation field 1 and RU allocation field 2 that appear in the primary 160 and secondary 160 appears repeatedly in the same manner as the RU allocation field in each 160 MHz band.

[0283] In other words, in each content channel, at least one corresponding field in the same segment may be set to the same value, and at least one corresponding field in different segments may be set to a different value.

[0284] For example, at least one field of the same type (or kind) field, except for a Resource Unit Allocation (RU Allocation) field, between a first content channel and the second content channel in the same segment among at least one segment may contain the same information. That is, the resource unit allocation information may be set to different values ​​or different information when the content channels are different even in the same segment.

[0285] If the first content channel and the second content channel include a particular field, the value of the particular field may be set to be the same in the same segment, but may be set to be different in different segments.

[0286] For example, if a first content channel and a second content channel transmitted in a first segment include a first common field including at least one field including the same value, and a first content channel and a second content channel transmitted in a second segment include a second common field including at least one field including the same value, the at least one field included in the first common field and the at least one field (of the same type) included in the second common field may include different values ​​or different information from each other.

[0287] FIG. 37 illustrates yet another example of an EHT-SIG repeated within a bandwidth when signaling a content channel according to one embodiment of the present invention.

[0288] Referring to FIG. 37, in each segment into which the total bandwidth is divided, the same field may contain different information, and within a segment, the same information may be contained and transmitted repeatedly for a certain frequency band.

[0289] Specifically, FIG. 37(a) shows a first transmission method (Optino 1) of the EHT-SIG field applicable when the four content channels shown in FIG. 32 are transmitted. According to the Option 1 embodiment, the same common field appears repeatedly every 20 MHz. The RU allocation fields that appear later are RU allocation fields 1, 2, 3, and 4 that appear repeatedly in 80 MHz units, and the channel including RU allocation field 1 can be named content channel 1, the channel including RU allocation field 2 can be named content channel 2, the channel including RU allocation field 3 can be named content channel 3, and the channel including RU allocation field 4 can be named content channel 4. User-specific fields 1, 2, 3, and 4 corresponding to the RU allocation fields included in the RU allocation fields may be included in the same content channel as the RU allocation.

[0290] Figure 37(b) shows a second method (Option 2) for transmitting the EHT-SIG field applicable to the embodiment in which four content channels are transmitted as shown in Figure 33. According to the Option 2 embodiment, PPDUs transmitted to each segment into which the total bandwidth is divided may contain different content, and the same content may be repeatedly transmitted for each certain frequency band within each segment.

[0291] For example, if the total bandwidth is 320 MHz and is divided into two segments of 160 MHz each, different common fields may be repeated every 20 MHz in the first segment, the primary 160 MHz, and the second segment, the secondary 160 MHz, and transmitted in the content channel. The common fields may appear with different numbers signaled in the RU allocation number subfield. The later RU allocation fields may be different RU allocation fields 1 and 2 and RU allocation fields 3 and 4 in the primary 160 MHz and the secondary 160 MHz, and transmitted in the content channel. The RU allocation fields 1 and 2 may be repeated every 40 MHz in the primary 160 MHz and transmitted in the content channel, and the RU allocation fields 3 and 4 may be transmitted in the content channel every 40 MHz in the secondary 160 MHz. The two RU allocation fields 1 and 2 and the corresponding user specific fields 1 and 2 appearing in the primary 160 MHz are repeated every 40 MHz in the primary 160 MHz, and the two RU allocation fields 3 and 4 appearing in the secondary 160 MHz and the corresponding user specific fields 3 and 4 appearing in the secondary 160 MHz are repeated every 40 MHz in the secondary 160 MHz. The channels in which the four types of RU allocation fields 1, 2, 3, 4 and the corresponding user specific fields 1, 2, 3, 4 appear can be named content channels 1, 2, 3, 4, respectively.

[0292] In other words, the EHT-SIG field may include at least one content channel, and the fields included in the content channels transmitted in each segment may have different values ​​from each other and may be repeatedly transmitted for a certain frequency band within the same segment.

[0293] For example, if the total bandwidth is 160 MHz and each segment is 80 MHz, two content channels (a first content channel and a second content channel) may be transmitted in each segment.

[0294] In this case, the types of fields constituting the first and second content channels transmitted in the first segment and the first and second content channels transmitted in the second segment are the same, but the contents contained in each field may be different. Also, the first and second content channels transmitted in the first and second segments may be repeatedly transmitted while occupying 20 MHz. For example, if the first content channel is transmitted in the lowest 20 MHz of 80 MHz, the second content channel may be transmitted in the next 20 MHz, and the first content channel may be transmitted in the next 20 MHz.

[0295] That is, in different 80 MHz segments, content channels having the same index have the same field configuration, but the content contained in each field may be different.

[0296] FIG. 38 is a flowchart illustrating an example of a PPDU receiving method of a terminal according to one embodiment of the present invention.

[0297] Referring to FIG. 38, a terminal may receive and decode a PPDU from an AP, and some fields of the PPDU transmitted to different terminals may be set to the same value between different terminals.

[0298] Specifically, the terminal can receive a physical protocol data unit (PPDU) from an access point (AP) (S38010) and decode the received PPDU (S38020).

[0299] In this case, the received PPDU may include a U-SIG (Universal Signal) field and an EHT (Extremely High Throughput)-SIG field including at least one content channel, and may be included in at least one PPDU transmitted to at least one terminal through MU (Multi-user)-MIMO (Multi-Input Multi-Output) operation by the AP.

[0300] At least one content channel may include a common field in which the same value is set for at least one terminal, and a user specific field that is set individually for each of the at least one terminal.

[0301] In this case, at least one of the terminal specific fields may be set to the same value among the at least one terminal.

[0302] The above description of the present invention is for illustrative purposes only, and those skilled in the art will understand that the present invention can be easily modified into other specific forms without changing the technical idea or essential features of the present invention. Therefore, the above-described embodiments should be understood as illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed form, and similarly, each component described as distributed may be implemented in a combined form.

[0303] The scope of the present invention is represented by the claims set forth below rather than the above detailed description, and all modifications and variations derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. [Explanation of symbols]

[0304] 100 stations 110 Processor 120 Communications Department 140 User Interface Section 150 display units 160 Memory 200 AP 210 Processor 220 Communications Department 260 Memory

Claims

1. A terminal of a wireless communication system, A communication module; a processor for controlling the communication module; The processor, Receive a physical layer protocol data unit (PPDU) from an AP (Access point); Decoding the received PPDU; The PPDU includes a Universal Signal (U-SIG) field and an Extremely High Throughput (EHT)-SIG field including at least one content channel; The PPDU is a PPDU transmitted to multiple terminals by a multi-user (MU) transmission operation by the AP, and includes a mode field associated with a puncturing pattern of a resource unit according to an overall bandwidth, The U-SIG field includes a bandwidth field indicating the total bandwidth over which the PPDU is transmitted; the total bandwidth includes one or more segments; the puncturing pattern of the resource unit according to the total bandwidth indicated by the bandwidth field is identified by a value of the mode field; A wireless communication terminal, wherein a puncturing granularity of the puncturing pattern is determined according to the total bandwidth indicated by the bandwidth field.

2. at least one field of the same type included in a first content channel and a second content channel in one segment of the one or more segments contains an identical value when the at least one content channel is composed of the first content channel and the second content channel; 2. The wireless communication terminal according to claim 1, wherein the at least one field includes at least one of a Low Density Parity Check Code (LDPC) extra symbol segment field, a space-time block coding (STBC) field, a Pre-FEC padding factor field, or a GI+LTF (long training field) size field.

3. 3. The wireless communication terminal of claim 2, wherein each of the first content channel and the second content channel is repeatedly transmitted for a certain frequency band within the first segment or the second segment when the one or more segments include a first segment and a second segment.

4. 4. The wireless communication terminal of claim 3, wherein the at least one field of the same type included in the first content channel and the second content channel includes a different value between the first segment and the second segment.

5. The wireless communication terminal of claim 1 , wherein the value of the mode field indicates a different puncturing pattern depending on the overall bandwidth indicated by the bandwidth field when the overall bandwidth indicated by the bandwidth field is different.

6. 4. The wireless communication terminal of claim 3, wherein the first content channel and the second content channel transmitted in the first segment include a first common field including the at least one field including the same value, and the first content channel and the second content channel transmitted in the second segment include a second common field including the at least one field including the same value.

7. The wireless communication terminal of claim 6 , wherein the at least one field included in the first common field and the at least one field included in the second common field include different information from each other.

8. The wireless communication terminal of claim 3, wherein the U-SIG field and / or the EHT-SIG field of the PPDU transmitted in the first segment have a different value from the U-SIG field and / or the EHT-SIG field of the PPDU transmitted in the second segment.

9. The wireless communication terminal of claim 1 , wherein the puncturing pattern indicates a contiguous resource pattern to which no puncturing is applied when a value of the mode field is set to a particular value.

10. The wireless communication terminal according to claim 1 , wherein the puncturing according to the puncturing pattern is not applied to a primary channel in the entire bandwidth.

11. The plurality of resource units may be configured with the same number or different numbers of tones when the plurality of resource units are allocated to the terminal, The wireless communication terminal of claim 9 , wherein the resource units are allocated discontinuously when a value of the mode field is set to a value other than the specific value.

12. The U-SIG field includes a specific field related to whether the EHT-SIG field includes a resource unit allocation field for resource unit allocation, The wireless communication terminal of claim 1, wherein the EHT-SIG field does not include the resource unit allocation field when the specific field indicates application of non-OFDMA (Orthogonal Frequency Division Multiplexing Access).

13. The wireless communication terminal of claim 1 , wherein the puncturing granularity of the puncturing pattern is doubled if the overall bandwidth indicated by the bandwidth field is doubled from 160 MHz to 320 MHz.

14. 1. A method for receiving data by a terminal in a wireless communication system, comprising: receiving a physical layer protocol data unit (PPDU) from an access point (AP); and decoding the received PPDU; The PPDU includes a Universal Signal (U-SIG) field and an Extremely High Throughput (EHT)-SIG field including at least one content channel; The PPDU is a PPDU transmitted to multiple terminals by a multi-user (MU) transmission operation by the AP, and includes a mode field associated with a puncturing pattern of a resource unit according to an overall bandwidth, The U-SIG field includes a bandwidth field indicating the total bandwidth in which the PPDU is transmitted and a mode field associated with a puncturing pattern of a resource unit according to the total bandwidth, the total bandwidth includes one or more segments; the puncturing pattern of the resource unit according to the total bandwidth indicated by the bandwidth field is identified by a value of the mode field; A method in which a puncturing granularity of the puncturing pattern is determined according to the total bandwidth indicated by the bandwidth field.

15. at least one field of the same type included in a first content channel and a second content channel in one segment of the one or more segments contains an identical value when the at least one content channel is composed of the first content channel and the second content channel; 15. The method of claim 14, wherein the at least one field includes at least one of a Low Density Parity Check Code (LDPC) Extra Symbol Segment field, a space-time block coding (STBC) field, a Pre-FEC Padding Factor field, or a GI+LTF (long training field) size field.

16. 16. The method of claim 15, wherein each of the first content channel and the second content channel is repeatedly transmitted for a certain frequency band within the first segment or the second segment when the one or more segments include a first segment and a second segment.

17. 17. The method of claim 16, wherein the at least one field of the same type included in the first content channel and the second content channel includes a different value between the first segment and the second segment.

18. The method of claim 14 , wherein the value of the mode field indicates different puncturing patterns depending on the overall bandwidth indicated by the bandwidth field when the overall bandwidth is different.

19. the first content channel and the second content channel transmitted in the first segment include a first common field including the at least one field that includes the same value; 17. The method of claim 16, wherein the first content channel and the second content channel transmitted in the second segment include a second common field, the second common field including the at least one field that includes the same value.

20. 20. The method of claim 19, wherein the at least one field included in the first common field and the at least one field included in the second common field contain different information from each other.

21. 17. The method of claim 16, wherein the U-SIG field and / or the EHT-SIG field of the PPDU transmitted in the first segment have different values ​​than the U-SIG field and / or the EHT-SIG field of the PPDU transmitted in the second segment.

22. The method of claim 14 , wherein the puncturing pattern indicates a contiguous resource pattern for which no puncturing is applied when the value of the mode field is set to a particular value.

23. The method of claim 14 , wherein the puncturing according to the puncturing pattern is not applied to a primary channel in the entire bandwidth.

24. The plurality of resource units may be configured with the same number or different numbers of tones when the plurality of resource units are allocated to the terminal, 23. The method of claim 22, wherein the plurality of resource units are allocated non-contiguously when a value of the mode field is set to a value other than the particular value.

25. The U-SIG field includes a specific field related to whether the EHT-SIG field includes a resource unit allocation field for resource unit allocation, The method of claim 14, wherein the EHT-SIG field does not include the resource unit allocation field when the specific field indicates application of non-OFDMA (Orthogonal Frequency Division Multiplexing Access).

26. The method of claim 14 , wherein the puncturing granularity of the puncturing pattern is doubled if the overall bandwidth indicated by the bandwidth field is doubled from 160 MHz to 320 MHz.

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