KR20210141314A - Apparatus and method for communication based on extended bandwidth and multi-resource unit in wireless local area network system - Google Patents

Abstract

A method for a first device to communicate with at least one second device in a wireless local area network (WLAN) system, the method comprising: allocating at least one resource unit to a second device within a bandwidth; defining at least one resource unit; The method may include generating at least one subfield, generating a trigger frame including a user information field including at least one subfield, wherein generating the at least one subfield comprises: setting at least 7-bits based on the resource unit, and when the bandwidth includes at least 4 subbands, setting at least 2-bits to a value defining a subband including at least one resource unit may include.

Description

APPARATUS AND METHOD FOR COMMUNICATION BASED ON EXTENDED BANDWIDTH AND MULTI-RESOURCE UNIT IN WIRELESS LOCAL AREA NETWORK SYSTEM

The technical idea of the present disclosure relates to wireless communication, and more particularly, to an apparatus and method for communication based on an extended bandwidth and a multi-resource unit (multi-RU) in a WLAN system.

A wireless local area network (WLAN) is a technology for connecting two or more devices to each other using a wireless signal transmission method, and the WLAN technology may be based on an Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard. The 802.11 standard has evolved into 802.11b, 802.11a, 802.11g, 802.11n, 802.11ac, and 802.11ax. can support

In 802.11ac, data may be simultaneously transmitted to multiple users through a multi-user multi-input multi-output (MU-MIMO) technique. In 802.11ax, referred to as High Efficiency (HE), not only MU-MIMO but also Orthogonal Frequency-Division Multiple Access (OFDMA) technology is applied to provide multiple access by dividing available subcarriers to users. is implementing Through this, the WLAN system to which 802.11ax is applied can effectively support communication in dense areas and outdoors.

In 802.11be, which is called Extremely High Throughput (EHT), it intends to implement 6GHz unlicensed frequency band support, bandwidth utilization of up to 320MHz per channel, Hybrid Automatic Repeat and reQuest (HARQ) introduction, and support for up to 16X16 MIMO. Through this, the next-generation WLAN system is expected to effectively support low latency and high-speed transmission like NR (New Radio), a 5G technology.

The technical idea of the present disclosure provides an apparatus and method for efficiently allocating a multi-resource unit (multi-RU) to a user within an extended uplink bandwidth in a WLAN system.

In order to achieve the above object, according to an aspect of the technical idea of the present disclosure, a method in which a first device communicates with at least one second device in a wireless local area network (WLAN) system includes at least one allocating a resource unit of to a second device, generating at least one subfield defining at least one resource unit, generating a trigger frame including a user information field including at least one subfield , and transmitting a physical protocol data unit (PPDU) including a trigger frame to at least one second device, wherein the generating of the at least one subfield includes at least one resource unit based on the at least one resource unit. Setting at least 7-bits, and when the bandwidth includes at least 4 subbands, may include setting at least 2-bits to a value defining a subband including at least one resource unit. .

According to an aspect of the present disclosure, a first device communicating with at least one second device in a wireless local area network (WLAN) system transmits a physical protocol data unit (PPDU) to the at least one second device and a transceiver configured to allocate at least one resource unit to the second device within a bandwidth, generate at least one subfield defining at least one resource unit, and at least one and a signal processor configured to generate a trigger frame including a user information field including a subfield, and to generate a PPDU including the trigger frame, wherein the signal processor is configured to: at least 7-bit based on at least one resource unit , and when the bandwidth includes at least four subbands, at least 2-bits may be set as a value defining a subband including at least one resource unit.

According to an aspect of the technical concept of the present disclosure, a method for a second device to communicate with a first device in a wireless local area network (WLAN) system includes the steps of receiving a physical protocol data unit (PPDU) from the first device, the PPDU extracting common information from, extracting an uplink bandwidth field from the common information, extracting user information from a PPDU, and extracting at least one subfield from the user information, and an uplink bandwidth field and at least one subfield based on the field, identifying at least one resource unit within the bandwidth, wherein identifying the at least one resource unit comprises: when the bandwidth includes at least four subbands, the at least one subband The method may include identifying a subband including at least one resource unit based on at least 2-bits including the first and second bits of the field.

According to an aspect of the technical concept of the present disclosure, in a method for a first device to communicate with at least one second device in a wireless local area network (WLAN) system, allocating at least one resource unit to a second device within a bandwidth a step of generating at least one subfield defining at least one resource unit; generating a trigger frame including a user information field including at least one subfield; physical protocol data unit) to the at least one second device, wherein generating the at least one subfield comprises: setting at least 8-bits based on the at least one resource unit; and when the bandwidth is 320 MHz and the total bandwidth of at least one resource unit is 160 MHz or less, setting the first bit to a value indicating one of a lower 160 MHz and an upper 160 MHz including at least one resource unit.

According to the method and apparatus according to an exemplary embodiment of the present disclosure, the apparatus and method for allocating a multi-resource unit (multi-RU) to a user within an extended uplink bandwidth in a WLAN system efficiently provides a multi-resource to a user A Physical Protocol Data Unit (PPDU) for allocating a unit (multi-RU) may be configured, thereby improving spectral efficiency and data transmission rate in the physical layer.

Effects that can be obtained in the exemplary embodiments of the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned are common knowledge in the art to which exemplary embodiments of the present disclosure pertain from the following description. It can be clearly derived and understood by those who have That is, unintended effects of carrying out the exemplary embodiments of the present disclosure may also be derived by those of ordinary skill in the art from the exemplary embodiments of the present disclosure.

1 is a diagram illustrating a wireless local area network (WLAN) system.
2 is a block diagram illustrating a wireless communication device for transmitting or receiving a PPDU.
3 is a diagram for explaining the structure of a HE SU (Single User) PPDU.
4 is a diagram for explaining the structure of an HE ER (Extended Range) SU PPDU.
5 is a diagram for explaining the structure of a HE TB (Trigger Based) PPDU.
6 is a diagram for explaining the structure of a HE MU (Multi User) PPDU.
7 is a diagram for explaining the structure of an EHT TB PPDU.
8 is a diagram for explaining the structure of an EHT MU PPDU.
9A and 9B are diagrams for explaining examples of the size, position, and index of a resource unit (RU) usable in a 20 MHz OFDMA PPDU.
10A and 10B are diagrams for explaining examples of sizes, positions, and indices of RUs usable in a 40 MHz OFDMA PPDU.
11A and 11B are diagrams for explaining examples of sizes, positions, and indices of RUs usable in an 80 MHz OFDMA PPDU.
12A and 12B are diagrams for explaining examples of indices of RUs usable in a 160 MHz OFDMA PPDU.
13A, 13B, 13C, 13D, and 13E are diagrams for explaining examples of indices of RUs usable in a 320 MHz OFDMA PPDU.
14 is a diagram for explaining the structure of a trigger frame.
15 is a diagram for explaining an example of a common information field.
16A and 16B are diagrams for explaining examples of a user information field.
17 is a message diagram illustrating a method for communication based on extended bandwidth and multiple RUs according to an exemplary embodiment of the present disclosure.
18 shows small size multiple RUs allocable to an STA in an OFDMA 20MHz EHT PPDU according to an exemplary embodiment of the present disclosure.
19 shows small size multiple RUs allocable to an STA in an OFDMA 40MHz EHT PPDU according to an exemplary embodiment of the present disclosure.
20 shows small size multiple RUs allocable to an STA in an OFDMA 80MHz EHT PPDU according to an exemplary embodiment of the present disclosure.
21A and 21B show small size multiple RUs allocable to an STA in an OFDMA 160MHz EHT PPDU according to an exemplary embodiment of the present disclosure.
22A, 22B and 22C show small size multiple RUs allocable to an STA in an OFDMA 320 MHz EHT PPDU according to an exemplary embodiment of the present disclosure.
23 illustrates large-size multiple RUs allocable to an STA in an OFDMA 80MHz EHT PPDU according to an exemplary embodiment of the present disclosure.
24 illustrates large-size multiple RUs allocable to an STA in an OFDMA 160MHz EHT PPDU according to an exemplary embodiment of the present disclosure.
25A, 25B and 25C show large-size multiple RUs allocable to an STA in an OFDMA 320 MHz EHT PPDU according to an exemplary embodiment of the present disclosure.
26 is a flowchart illustrating a method for communication based on extended bandwidth and multiple RUs according to an exemplary embodiment of the present disclosure.
27 is a flowchart illustrating a method for communication based on extended bandwidth and multiple RUs according to an exemplary embodiment of the present disclosure.
28A and 28B are diagrams illustrating examples of a user information field according to exemplary embodiments of the present disclosure.
29A and 29B are diagrams illustrating RU allocation subfields according to an exemplary embodiment of the present disclosure.
30 shows multiple RUs including a 996-tone RU and a 484-tone RU and values of an RU allocation subfield according to an exemplary embodiment of the present disclosure.
31 shows multiple RUs including a 996-tone RU, a 484-tone RU, and a 242-tone RU and values of an RU allocation subfield according to an exemplary embodiment of the present disclosure.
32 shows values of the Multiple RUs and RU Allocation subfield including two 996-tone RUs and a 484-tone RU according to an exemplary embodiment of the present disclosure.
33 shows multiple RUs including three 996-tone RUs and values of an RU allocation subfield according to an exemplary embodiment of the present disclosure.
34 shows the values of the Multiple RUs and RU Allocation subfield including three 996-tone RUs and a 484-tone RU according to an exemplary embodiment of the present disclosure;
35 is a diagram illustrating an RU allocation subfield according to an exemplary embodiment of the present disclosure.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

Advantages and features of the present disclosure, and methods for achieving them, will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present disclosure is not limited to the embodiments shown below, but will be implemented in various different forms, and only the present embodiments are intended to complete the description of the present disclosure. In addition, it is provided to fully inform those of ordinary skill in the art to which the present disclosure belongs the scope of the disclosure, and the present disclosure is only defined by the scope of the claims. In addition, specific configurations described only in each embodiment of the present disclosure may be used in other embodiments. Like reference numerals refer to like elements throughout.

The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present disclosure. As used herein, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, "comprises" and/or "comprising" refers to the presence of one or more other components, steps, operations and/or elements mentioned. or addition is not excluded.

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which this disclosure belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless clearly defined in particular.

In addition, in describing the embodiments of the present disclosure in detail, OFDM or OFDMA-based wireless communication systems, in particular, IEEE 802.11 standards will be mainly targeted, but the main subject matter of the present disclosure may be related to others having a similar technical background and channel type. of a communication system (eg, long term evolution (LTE), LTE-Advanced (LTE-A), New Radio (NR), Wireless Broadband (WiBro), Global System for Mobile Communication (GSM), such as cellular Communication systems or short-distance communication systems such as Bluetooth and NFC (Near Field Communication) can also be applied with slight modifications within a range that does not significantly depart from the scope of the present disclosure, which is a technical skill skilled in the art of the present disclosure. It will be possible with the judgment of those with knowledge.

And before proceeding with the detailed description that follows, it is desirable to set forth definitions of certain words and phrases used throughout this patent document. The word "connects" and its derivatives refer to any direct or indirect communication between two or more components, whether or not they are in physical contact with each other. The terms "transmit", "receive", and "communicate", as well as their derivatives, include both direct and indirect communication. The terms "comprise" and "comprises" and their derivatives mean inclusive without limitation. The word "or" is an inclusive word meaning 'and/or'. "relates to" and its derivatives include, is included in, interconnects with, implies, is implied in, connects to, connects to, binds to, communicates with can, cooperate with, intervene, juxtapose, approximate to, be bound by, have, have the characteristics of, have a relationship with, etc. The term "controller" means any device, system, or part thereof that controls at least one operation. Such a controller may be implemented in hardware or a combination of hardware and software and/or firmware. Functions associated with any particular controller may be centralized or distributed, either locally or remotely. The phrase "at least one" when used with a list of items means that different combinations of one or more of the listed items may be used, and that only one item in the list may be required. For example, “at least one of A, B, and C” includes any one of combinations of A, B, C, A and B, A and C, B and C, and A and B and C.

In addition, various functions described below may be implemented or supported by one or more computer programs, each of which consists of computer readable program code and is implemented in a computer readable medium. The terms "application" and "program" refer to one or more computer programs, software components, sets of instructions, procedures, functions, objects, classes, instances, related data, or portions thereof suitable for implementation of suitable computer readable program code. The term "computer readable program code" includes computer code of any type, including source code, object code, and executable code. The term "computer-readable medium" means a computer, such as read only memory (ROM), random access memory (RAM), hard disk drive, compact disk (CD), digital video disk (DVD), or any other type of memory. It includes all types of media that can be accessed by “Non-transitory” computer-readable media excludes wired, wireless, optical, or other communication links that transmit transitory electrical or other signals. Non-transitory computer readable media includes media in which data can be permanently stored, and media in which data can be stored and later overwritten, such as a rewritable optical disk or a removable memory device.

In various embodiments of the present disclosure described below, a hardware approach is described as an example. However, since various embodiments of the present disclosure include a technology using both hardware and software, the various embodiments of the present disclosure do not exclude a software-based approach.

In addition, terms that refer to control information used in the description to be described later, terms that refer to entries, terms that refer to network entities, terms that refer to messages, terms that refer to components of devices, etc. It is illustrated for convenience of description. Accordingly, the present disclosure is not limited to the terms described below, and other terms having equivalent technical meanings may be used.

1 is a diagram illustrating a wireless local area network (WLAN) system. 2 is a block diagram illustrating a wireless communication device for transmitting or receiving a PPDU.

First, as shown in FIG. 1 , the WLAN system 100 may include APs 101 and 103 (Access Points).

Specifically, the APs 101 and 103 may communicate with at least one network 130 such as the Internet, an Internet protocol (IP) network, or another data network.

In addition, the APs 101 and 103 may provide wireless access to the network 130 for a plurality of STAs 111 to 114 within the coverage areas 120 and 125 of the APs 101 and 103 . Additionally, the APs 101 and 103 may communicate with each other using wireless fidelity (WiFi) or other WLAN communication technologies. In addition, the APs 101 and 103 may communicate with the plurality of STAs 111 to 114 using wireless fidelity (WiFi) or other WLAN communication technologies. In this specification, the AP may be referred to as a first device, and the STA may be referred to as a second device, whereby the first device may communicate with at least one second device.

For reference, depending on the network type, other well-known terms such as "router" and "gateway" may be used instead of "AP" or "access point". Also, in a WLAN, an AP is provided for a radio channel. And, AP may mean STA.

Also, depending on the network type, "STA" or "station" may be referred to as "mobile station", "subscriber station", "remote terminal", "user equipment", may be used in place of other well-known terms such as “wireless terminal,” “user device,” or “user.” For convenience, the term “STA” is used herein to denote a remote wireless device that wirelessly accesses an AP or accesses a wireless channel within a WLAN. Although in this document a STA is considered a mobile device (eg, a mobile phone or smartphone), a STA may be a fixed device (eg, a desktop computer, AP, media player, fixed sensor, television, etc.).

The dashed lines show the approximate extent of the coverage areas 120 , 125 . Here, coverage areas 120 and 125 are shown as generally circular for purposes of illustration and illustration. However, the coverage areas 120 and 125 associated with the APs 101 and 103 may have different shapes reflecting various changes in the wireless environment related to natural or artificial obstructions, or Depending on the settings, it may have other shapes, including irregular shapes.

As will be described later in detail, the APs 101 and 103 include circuitry and/or a program for UL Uplink Multi-User (UL MU) or DL Downlink Multi-User (DL MU) transmission management in a WLAN system. can do.

And Figure 1 shows an example of the WLAN system 100, the embodiment of the present disclosure is not limited thereto. That is, various changes may be made in FIG. 1 .

For example, WLAN system 100 may include any number of APs and any number of STAs, any suitably deployed. Also, the AP 101 can communicate directly with any number of STAs. In addition, the AP 101 may provide a wireless broadband connection with the network 130 to the STAs 111 to 114 .

Similarly, the APs 101 and 103 may communicate directly with the network 130 , respectively, and may provide the network 130 with wireless broadband connectivity with the STAs 111 - 114 . Also, the APs 101 and 103 may implement connections with various external networks, such as external telephone networks or data networks.

Next, in FIG. 2 , a wireless communication device for transmitting or receiving a PPDU is illustrated.

For reference, the wireless communication device 1100 of FIG. 2 may be a transmitting device (eg, AP) or a receiving device (eg, STA) equipped with a transceiver capable of data communication. That is, the wireless communication device of FIG. 2 may be any one of the APs 101 and 103 and the STAs 111 to 114 shown in FIG. 1, for example, a computer, a smart phone, It may be applied to a sensor used in a portable electronic device, a tablet, a wearable device, and the Internet of Things (IoT).

However, for convenience of description, a case in which the wireless communication device 1100 is a transmitting device will be described as an example.

The wireless communication device 1100 may include a main processor 1130 , a memory 1120 , a transceiver 1140 , and antenna arrays 1101 to 1104 . In addition, the main processor 1130 , the memory 1120 , the transceiver 1140 , and the antenna arrays 1101 to 1104 may be directly or indirectly connected to each other.

Specifically, the main processor 1130 may control the memory 1120 and the transceiver 1140 . In addition, the PPDU format and multi-RU allocation information may be stored in the memory 1120 . In addition, the transceiver 1140 may generate a PPDU by using the PPDU format and multi-RU allocation information stored in the memory 1120 . Furthermore, the transceiver 1140 may transmit the generated PPDU to an external receiving device (eg, an STA) through the antenna arrays 1101 to 1104 .

Here, the memory 1120 may store the PPDU format 1121 including the RU allocation signaling format according to an embodiment of the present disclosure, which will be described later. In addition, the memory 1120 may store processor-executable instructions for executing the RU allocation module 1122 and the PPDU generation module 1123 . In addition, these processor-executable instructions may be executed by the main processor 1130 .

For reference, the RU allocation module 1122 is configured to allocate at least one RU, that is, a single RU or multiple RUs, to a user (eg, an STA) within an extended bandwidth according to an embodiment of the present disclosure, an RU allocation algorithm , methods or policies can be used. In addition, the PPDU generation module 1123 may generate signaling and an indication related to an uplink bandwidth and at least one allocated RU in a trigger frame of the PPDU.

Meanwhile, the transceiver 1140 may include a signal processor 1150 . and the signal processor 1150 may have various modules (ie, various modules of the transmit path) configured to generate each section of the PPDU or various types of communication transmission units. can

Specifically, the signal processor 1150 is a TX FIFO (1111; transmit First-In-First-Out), an encoder (1112; encoder), a scrambler (1113; scrambler), an interleaver (1114; interleaver), a constellation mapper ( 1115; with constellation mapper, for example, capable of generating QAM symbols), IDFT (1117; Inversed Discrete Fourier Transformer), with guard interval and windowing insertion module 1116; with guard interval and windowing insertion module, for example , a guard interval is put on the frequency to reduce interference on the spectrum, and the signal can be transformed through windowing).

For reference, the transceiver 1140 may include components well known to those skilled in the art as shown in the drawings. And the corresponding parts may be implemented in a manner well known to those skilled in the art, and may be implemented using hardware, firmware, software logic, or a combination thereof.

Of course, when the wireless communication device 1100 is a receiving device, the transceiver 1140 shown in FIG. 2 may also include the components in a receiving path.

That is, when the wireless communication device 1100 is the receiving device, the transceiver 1140 may receive the PPDU including the trigger frame from the transmitting device. In addition, the transceiver 1140 may decode the trigger frame included in the received PPDU. That is, the transceiver 1140 may decode the trigger frame through an internal decoder (not shown) to identify the uplink bandwidth and at least one RU allocated to the receiving device, and based on the identified at least one RU, the transmitting device PPDU can be transmitted to

Of course, the subject of the 'decoding task' may be a component other than the transceiver 1140 (eg, the main processor 1130), but in the embodiment of the present disclosure, the transceiver 1140 triggers the PPDU received Decoding a frame will be described as an example.

Meanwhile, FIG. 2 only shows an example of the wireless communication device 1100 and the embodiment of the present disclosure is not limited thereto. That is, various changes may be made in FIG. 2 .

Hereinafter, an HE PPDU used in the IEEE standard (ie, 802.11ax) will be described with reference to FIGS. 3 to 6 . For reference, the HE PPDU described in FIGS. 3 to 6 may be generated by the wireless communication device 1100 of FIG. 2 .

3 is a diagram for explaining the structure of an HE SU PPDU. 4 is a diagram for explaining the structure of an HE ER (Extended Range) SU PPDU. 5 is a diagram for explaining the structure of a HE TB (Trigger Based) PPDU. 6 is a diagram for explaining the structure of an HE MU PPDU. As shown in FIGS. 3 to 6, each HE PPDU includes a plurality of training fields and a plurality of signaling fields. and a payload including a preamble, a data field, and a packet extension.

Specifically, each HE PPDU is L-STF (Legacy-short training field; 8us length), L-LTF (Legacy-long training field; 8us length), L-SIG (Legacy-signal; 4us length), RL- SIG (Repeated L-SIG; 4us long), HE-SIG-A (High Efficiency-Signal-A; 8us long), HE-STF (High Efficiency-STF; 4us long), HE-LTF (High Efficiency-LTF) , DATA (ie, a data field), and PE (ie, a Packet Extension field).

Of course, the HE SU PPDU of FIG. 3 does not include HE-SIG-B, and the HE MU PPDU of FIG. 6 may further include HE-SIG-B. And, although the HE ER SU PPDU of FIG. 4 does not include HE-SIG-B, a symbol of HE-SIG-A may be repeated (16us in length). In addition, although the HE TB PPDU of FIG. 5 does not include HE-SIG-B, a symbol of HE-STF may be repeated (8us length).

Here, each field included in the preamble will be briefly described as follows.

L-STF may include a short training orthogonal frequency division multiplexing symbol (OFDM symbol), frame detection (frame detection), automatic gain control (AGC), diversity detection (diversity detection), approximate frequency / time It may be used for synchronization (coarse frequency/time synchronization).

The L-LTF may include a long training orthogonal frequency division multiplexing symbol (OFDM), and may be used for fine frequency/time synchronization and channel prediction.

The L-SIG may be used for transmission of control information and may include information on a data rate and a data length. For reference, the L-SIG may be repeatedly transmitted, and the format in which the L-SIG is repeated in this way is called RL-SIG.

HE-SIG-A may include control information common to the receiving device, which is as follows.

1) DL (Downlink) / UL (Uplink) indicator

2) BSS color field that is an identifier of BSS (Basic Service Set)

3) A field indicating the remaining time of the current TXOP (Transmission Opportunity) section

4) Bandwidth field indicating whether 20/40/80/160/80+80MHz

5) Field indicating Modulation and Coding Scheme (MCS) technique applied to HE-SIG-B

6) A field indicating whether HE-SIG-B is modulated by a dual subcarrier modulation technique

7) A field indicating the number of symbols used for HE-SIG-B

8) A field indicating whether HE-SIG-B is generated over the entire band

9) Field indicating the number of symbols of HE-LTF

10) A field indicating the length of HE-LTF and the length of CP (Cyclic Prefix)

11) A field indicating whether an additional OFDM symbol exists for LDPC (Low Density Parity Check) coding

12) Field indicating control information about PE (Packet Extension)

13) A field indicating information on the CRC (Cyclical Redundancy Check) field of HE-SIG-A

HE-SIG-A may further include various information in addition to 1) to 13) described above, or may not include some information among 1) to 13). In addition, in an environment other than a multi-user (MU) environment, some information may be further added to HE-SIG-A or some information of HE-SIG-A may be omitted.

HE-SIG-B may be used in case of PPDU for MU. That is, HE-SIG-B may be omitted from the PPDU for a single user (SU). For reference, HE-SIG-A or HE-SIG-B may include RU allocation information for at least one receiving device for downlink transmission. Packet Extension (PE) includes 4us, 8us, With a duration of 12us or 16us, an additional receive processing time may be provided at the end of the HE PPDU.

7 is a diagram for explaining the structure of an EHT TB PPDU. 8 is a diagram for explaining the structure of an EHT MU PPDU. Embodiments of the present disclosure may also be applied to 802.11be, which is a next-generation WLAN standard. Accordingly, the multi-RU allocation method and apparatus according to an embodiment of the present disclosure may be included in an Extremely High Throughput (EHT) PPDU. Hereinafter, with reference to FIGS. 18 and 19 , the IEEE standard (ie, 802.11be) Describe the EHT PPDU used in . For reference, the EHT PPDU described in FIGS. 7 and 8 may be generated by the wireless communication device 1100 of FIG. 2 .

7 and 8, each EHT PPDU includes a preamble including a plurality of training fields and a plurality of signaling fields, and a data field. It may include a payload that includes.

Specifically, each EHT PPDU is L-STF (Legacy-short training field; 8us length), L-LTF (Legacy-long training field; 8us length), L-SIG (Legacy-signal; 4us length), RL- SIG (Repeated L-SIG; 4us long), U-SIG (Universal-Signal; 8us long), EHT-STF (Extremely High Throughput-STF), EHT-LTF (Extremely High Throughput-LTF), DATA (i.e. data field) can be included.

Of course, the EHT TB PPDU of FIG. 7 does not include an EHT-SIG (Extremely High Throughput-Signal), but a symbol of the EHT-STF may be repeated, and the EHT MU PPDU of FIG. 8 includes a plurality of OFDM symbols. Consists of, and may further include EHT-SIG. In addition, in the case of the EHT TB PPDU of FIG. 7 , a trigger frame may be required for transmission of the EHT TB PPDU, like the above-described HE TB PPDU of FIG. 5 . Of course, the trigger frame for EHT TB PPDU transmission may have a structure and function similar to that of the trigger frame of FIG. 14 to be described later.

For reference, the payload of each EHT PPDU may further include a PE (ie, a Packet Extension field), but in the embodiment of the present disclosure, for convenience of description, it is assumed that each EHT PPDU does not include a PE. listen and explain.

Meanwhile, a brief description of each field included in the EHT PPDU is as follows.

For reference, 'L-STF', 'L-LTF', 'L-SIG', and 'RL-SIG' of the EHT PPDU are 'L-STF', 'L-LTF', 'L- SIG', 'RL-SIG' is the same as or similar to the bar, detailed description thereof will be omitted.

The U-SIG is a field that performs a function similar to that of HE-SIG-A of the HE PPDU, is disposed immediately after the RL-SIG field, and may consist of two OFDM symbols that are jointly encoded.

Specifically, the U-SIG may include 'Version-independent fields' and 'Version-dependent fields', and the 'Version-dependent fields' may be disposed after the 'Version-independent fields'.

Here, 'Version-independent fields' may have static location and bit definitions over different generations/physical versions.

In addition, 'Version-independent fields' may include, for example, the following control information.

1) PHY version identifier (ie, physical version identifier; consists of 3 bits)

2) UL (Uplink)/DL (Downlink) flag (consisting of 1 bit)

3) BSS color (ie, BSS color field that is an identifier of BSS (Basic Service Set))

4) TXOP duration (that is, a field indicating the remaining time of the current TXOP (Transmission Opportunity) section)

5) Bandwidth (ie, bandwidth field; for reference, the bandwidth field may carry some puncturing information)

Meanwhile, 'Version-dependent fields' may have variable bit definitions for each physical version (PHY version).

In addition, 'Version-dependent fields' may include, for example, the following control information.

1) PPDU type (field indicating PPDU type)

2) EHT-SIG MCS (a field indicating the Modulation and Coding Scheme (MCS) technique applied to the EHT-SIG, which is a field present in the U-SIG of the EHT PPDU transmitted to the MU)

3) Number of EHT-SIG Symbols (a field indicating the number of symbols used for EHT-SIG, a field present in U-SIG of EHT PPDU transmitted to MU)

The U-SIG may further include various types of information in addition to the aforementioned control information, or may not include some of the aforementioned control information. In addition, in an environment other than a multi-user (MU) environment, some information may be further added to the U-SIG or some information of the U-SIG may be omitted.

The EHT-SIG is a field responsible for a function similar to that of HE-SIG-B of the HE PPDU. It is disposed immediately after the U-SIG field in the EHT PPDU transmitted to the MU (Multi-User), and has a variable MCS technique and length ( variable MCS and variable length).

Specifically, the EHT-SIG may include a common field including common control information and a user-specific field including user-specific control information.

Here, the common field can be separately encoded from the user-specific field. In addition, the common field may include RU allocation related information for downlink transmission (eg, information consisting of 'RU Allocation subfield' and 'Additional RU Allocation subfield'), and a user-specific field (User-Specific). field) may include information similar to information included in the user-specific field of the above-described HE-SIG-B (ie, user information allocated to each RU).

For reference, in the common field of the EHT-SIG field of the EHT PPDU transmitted to the MU, at least one compression mode in which the 'RU Allocation subfield' does not exist may exist. In addition, the EHT-SIG may be basically used in the PPDU for the MU, but unlike the 'HE PPDU', when the overhead of the U-SIG increases, it may be used in the PPDU for SU (Single User) transmission. .

9A and 9B are diagrams illustrating examples of sizes, positions, and indices of RUs usable in a 20 MHz OFDMA PPDU. 10A and 10B are diagrams for explaining examples of sizes, positions, and indices of RUs usable in a 40 MHz OFDMA PPDU. 11A and 11B are diagrams for explaining examples of sizes, positions, and indices of RUs usable in an 80 MHz OFDMA PPDU. 12A and 12B are diagrams for explaining examples of indices of RUs usable in a 160 MHz OFDMA PPDU. 13A, 13B, 13C, 13D, and 13E are diagrams for explaining examples of indices of RUs usable in a 320 MHz OFDMA PPDU. That is, as shown in FIGS. 9A, 10A and 11A, a data field At least one RU may be disposed in a frequency domain of 9B, 10B, 11B, 12A, 12B, 13A, 13B, 13C, 13D, and 13E representing indices of RUs, a subcarrier index of zero may correspond to a DC tone and , a negative subcarrier index may correspond to a subcarrier having a frequency lower than a DC tone, and a positive subcarrier index may correspond to a subcarrier having a frequency higher than the DC tone.

First, in FIG. 9A, the arrangement of resource units (RUs) usable in a 20 MHz OFDMA PPDU is shown.

Specifically, 6 tones (ie, subcarrier) are used as a guard band in the leftmost band of the 20 MHz band, and 5 tones are used in the rightmost band of the 20 MHz band. It can be used as a guard band. In addition, 7 DC tones are inserted into the center band, that is, a direct current (DC) band, and 26-tone RUs corresponding to each of 13 tones may exist on the left and right sides of the DC band. In addition, 26-tone RUs, 52-tone RUs, and 106-tone RUs may be allocated to other bands. Each RU may be allocated for a receiving device, that is, a user.

For reference, the RU arrangement of FIG. 9A may be utilized not only in a situation for multiple users (MU), but also in a situation for a single user (SU). Accordingly, as shown at the top of FIG. 9A , a plurality of 26-ton RUs may be deployed, and as shown at the bottom of FIG. 9A , one 242-ton RU composed of 242L and 242R is deployed (this In this case, three DC tones may be inserted into the center band).

Of course, in the example of FIG. 9A , RUs of various sizes, ie, 26-ton RU, 52-ton RU, 106-ton RU, 242-ton RU, and the like have been proposed, and the specific size of these RUs may be expanded or increased. Therefore, embodiments of the present disclosure are not limited to the specific size of each RU (ie, the number of corresponding tones).

Referring to FIG. 9B , the RUs of FIG. 9A may be sequentially indexed from a low frequency. For example, 26-tone RUs may be indexed as first to ninth RUs (RU1 to RU9), 52-tone RUs may be indexed as first to fourth RUs (RU1 to RU4), and 106- Tone RUs may be indexed as first and second RUs (RU1, RU2), and 242-tone RUs may be indexed as first RUs (RU1). In FIG. 9B , the fifth RU (RU5) may be a central 26-tone RU.

Subsequently, in FIG. 10A , the arrangement of resource units (RUs) usable in a 40 MHz OFDMA PPDU is illustrated.

Specifically, 12 tones (ie, subcarrier) are used as a guard band in the leftmost band of the 40 MHz band, and 11 tones are used in the rightmost band of the 40 MHz band. It can be used as a guard band. In addition, five DC tones may be inserted into the center band, that is, a direct current (DC) band. In addition, 26-tone RUs, 52-tone RUs, 106-tone RUs, and 242-tone RUs may be allocated to other bands. Each RU may be allocated for a receiving device, that is, a user.

For reference, the RU arrangement of FIG. 10A may be utilized not only in a situation for multiple users (MU) but also in a situation for a single user (SU). Accordingly, as shown at the bottom of FIG. 10 , one 484-tone RU composed of 484L and 484R may be disposed (in this case, 5 DC tones are inserted into the center band).

Of course, in the example of FIG. 10A , RUs of various sizes, ie, 26-ton RU, 52-ton RU, 106-ton RU, 242-ton RU, 484-ton RU, and the like have been proposed, and specific sizes of these RUs are proposed. may be expanded or increased, so the embodiment of the present disclosure is not limited to a specific size (ie, the number of corresponding tones) of each RU.

Referring to FIG. 10B , the RUs of FIG. 10A may be sequentially indexed from a low frequency. For example, 26-tone RUs may be indexed as first through 18th RUs (RU1 through RU18), 52-tone RUs may be indexed with first through eighth RUs (RU1 through RU8), 106- Tone RUs may be indexed into first through fourth RUs (RU1 through RU4), 242-tone RUs may be indexed with first and second RUs (RU1, RU2), and 484-tone RUs may be indexed as first RUs. may be indexed as (RU1).

In FIG. 11A, an arrangement of resource units (RUs) usable in an 80 MHz OFDMA PPDU is shown.

Specifically, 12 tones (ie, subcarrier) are used as a guard band in the leftmost band of the 80MHz band, and 11 tones are used in the rightmost band of the 80MHz band. It can be used as a guard band. In addition, 26-tone RUs, 52-tone RUs, 106-tone RUs, 242-tone RUs, and 484-tone RUs may be allocated to other bands. Each RU may be allocated for a receiving device, that is, a user.

For reference, the RU arrangement of FIG. 11A may be utilized not only in a situation for multiple users (MU), but also in a situation for a single user (SU). Accordingly, as shown in the lowermost part of FIG. 11A , one 996-tone RU composed of 996L and 996R may be disposed (in this case, five DC tones are inserted into the center band).

Of course, in the example of FIG. 11A, RUs of various sizes, that is, 26-ton RU (hereinafter, used in combination with RU26), 52-ton RU (hereinafter, used in combination with RU52), 106-ton RU ( Hereinafter, used interchangeably with RU106), 242-ton RU (hereinafter, used interchangeably with RU242), 484-ton RU (hereinafter, used interchangeably with RU484), 996-ton RU (hereinafter, with RU996) Since the specific size of such RUs can be expanded or increased, the embodiment of the present disclosure is not limited to the specific size of each RU (ie, the number of corresponding tones).

Referring to FIG. 11B , the RUs of FIG. 11A may be sequentially indexed from a low frequency. For example, a 26-tone RU may be indexed into the first through the 37th RUs (RU1 through RU37), whereas the center 26-tone RU may be used in HE (ie, 802.11ax), while the EHT (ie, 802.11be) ), the central 26-tone RU may not be used. In some embodiments, as shown in FIG. 11B , the central 26-tone RU in the EHT may be indexed as the 19th RU (RU19), so that the indexing of the RU in the EHT maintains compatibility with the HE. can

12A and 12B , in a 160 MHz OFDM PPDU, RUs may be sequentially indexed from a low frequency. For example, 26 tone-RUs may be indexed as first through 74th RUs (RU1 through RU74). As described above with reference to FIG. 11B , the center 26-tone RU of the 20 MHz bandwidth may not be used, and accordingly, the 19 th RU (RU19) and the 56 th RU (RU56) of FIG. 12 may not be used.

13A, 13B, 13C, 13D, and 13E , in a 320 MHz OFDM PPDU, RUs may be sequentially indexed from a low frequency. For example, 26 tone-RUs may be indexed as first through 148th RUs (RU1 through RU148). As described above with reference to FIG. 11B , the central 26-tone RU of the 20 MHz bandwidth may not be used, and accordingly, the 19th RU (RU19), the 56th RU (RU56), and the 93rd RU of FIGS. 13A and 13B . (RU93) and the 130th RU (RU130) may not be used.

In some embodiments, the RU locations usable in a 40 MHz OFDMA PPDU may be equivalent to two replicas of the RU locations usable in a 20 MHz OFDMA PPDU. Also, the RU positions available in an 80 MHz OFDMA PPDU may be equivalent to two copies of the RU positions available in a 40 MHz OFDMA PPDU. Also, the RU locations usable in a 160 MHz OFDMA PPDU may be equivalent to two copies of the RU locations usable in an 80 MHz OFDMA PPDU. Also, the locations available in a 320 MHz OFDMA PPDU may be equivalent to two copies of the RU locations available in a 160 MHz OFDMA PPDU. Accordingly, in a bandwidth of 160Mz, 52-tone RUs may be indexed as 1st to 32nd RUs (RU1 to RU32), and 106-tone RUs may be indexed as 1st to 16th (RU1 to RU16), and , 242-ton RUs may be indexed into first through eighth RUs (RU1 through RU8), 484-tone RUs may be indexed with first through fourth RUs (RU1 through RU4), and 996-tone RUs may be indexed with first through fourth RUs (RU1 through RU4). It may be indexed by first and second RUs (RU1, RU2). Similarly, in a 320 MHz bandwidth, 52-tone RUs may be indexed as 1st through 64th RUs (RU1 through RU64), and 106-tone RUs may be indexed as 1st through 32th (RU1 through RU32), A 242-tone RU may be indexed into first through sixteenth RUs (RU1 through RU16), a 484-tone RU may be indexed with first through eighth RUs (RU1 through RU8), and a 996-tone RU may be indexed as the first through eighteenth RUs (RU1 through RU8). It may be indexed as 1 to 4 RUs (RU1 to RU4).

In this way, at least one RU may be variously disposed in the frequency domain of the data field.

14 is a diagram for explaining the structure of a trigger frame. When an uplink (UL) transmission operation by each of one or more STAs (eg, non-AP STAs) is performed in the frequency domain, the AP uplinks different frequency resources for each of the one or more STAs based on OFDMA It can be allocated as a link transmission resource. Here, the frequency resource may mean an RU, and this frequency resource may be indicated by a trigger frame transmitted by the AP to the STA before an uplink transmission operation.

Accordingly, a trigger frame is required for transmission of the HE TB PPDU of FIG. 5 or the EHT TB PPDU of FIG. 7 , and this trigger frame is illustrated in FIG. 14 .

Specifically, the trigger frame may set an uplink bandwidth, allocate an RU for uplink multiple-user transmission (MU), and may be transmitted from the AP to the STA. In addition, the trigger frame may be composed of a media access control (MAC) frame and may be included in the PPDU.

In addition, the trigger frame may be transmitted through the PPDU shown in FIGS. 3 to 8 or may be transmitted through a PPDU specially designed for the corresponding trigger frame. For reference, when transmitted through the PPDU shown in FIGS. 3 to 8 , a trigger frame may be included in the data field.

Specifically, as shown in FIG. 14 , the trigger frame includes a frame control field 400 (2 octets), a duration field 405 (2 octets), an RA field 410; 6 octets, and a TA. field (415; 6 octets), common information field (420; more than 8 octets), and individual user info field (425-1 to 425-N; N is a natural number greater than or equal to 1, each greater than or equal to 5 octets) ), a padding field 430 (Padding) and a frame check sequence field 435 (Frame Check Sequence (FCS), 4 octets or more).

First, the frame control field 400 includes information about the version of the MAC protocol and other additional control information, and the Duration field 405 is for setting a Network Allocation Vector (NAV). It may include information about time information or an identifier (eg, AID; Association ID) of the terminal. In addition, the RA field 410 includes address information of a receiving device (eg, STA) of the corresponding trigger frame, and may be omitted if necessary. In addition, the TA field 415 may include address information of a device (eg, AP) transmitting the corresponding trigger frame.

For reference, in the TA field 415, a field indicating the length of the L-SIG field of the uplink PPDU transmitted in response to the trigger frame or the SIG-A field of the uplink PPDU transmitted in response to the trigger frame Information for controlling the content of (ie, HE-SIG-A field) may be included. In addition, the TA field 415 may include, as common control information, information on the length of the CP of the uplink PPDU transmitted in response to the corresponding trigger frame or information on the length of the LTF field.

The common information field 420 may include common control information applied to a receiving device (eg, an STA) that receives the corresponding trigger frame. In addition, the trigger frame may include individual user information fields (425-1 to 425-N; N is a natural number greater than or equal to 1) corresponding to the number of receiving devices (eg, STAs) that receive the trigger frame. have. For reference, the individual user information field may be referred to as a “user information list field”. In addition, the trigger frame may include a padding field 430 (Padding) and a frame check sequence field 435 (Frame Check Sequence; FCS).

Of course, each field of the trigger frame may be partially omitted, and another field may be added. Also, the length of each field may be changed differently from that shown.

An embodiment of the present disclosure relates to a method and an apparatus for supporting an MU using OFDMA, and more specifically, a transmitting device (eg, AP) to a plurality of receiving devices (eg, STA) through OFDMA A method and apparatus for allocating at least one RU in an extended uplink bandwidth to at least one of the A method and apparatus for configuring a trigger frame indicating information on an uplink bandwidth and at least one RU allocated to each receiving apparatus (eg, STA) will be described below with reference to the drawings. In addition, a method and apparatus for identifying an uplink bandwidth and at least one allocated RU from a trigger frame will be described below with reference to the drawings. For example, as will be described later with reference to FIG. 17, the AP may allocate at least one RU, that is, an RU or multiple RUs, to at least one STA, and may generate a trigger frame for uplink OFDMA transmission. and may transmit the generated trigger frame to at least one STA. The STA may receive a trigger frame from the AP, and may identify at least one RU allocated to it for uplink OFDMA based on information included in the received trigger frame, and based on the identified at least one RU Thus, data, that is, a PPDU can be transmitted to the AP. However, the embodiments of the present disclosure are applicable even when the STA transmits data to the STA and the AP transmits data to the STA. In addition, an embodiment of the present disclosure may be applied not only to the downlink OFDMA scheme and the uplink OFDMA scheme, but also to an environment supporting a single user, such as a single user (SU) PPDU. Information on the uplink bandwidth and the RU allocated to the receiving device (eg, STA) may be provided to the receiving device by the common information field 420 and the user information field of the trigger frame, and in Figs. The common information field 420 and the user information field will be described with reference to Figs. 16A and 16B.

15 is a diagram for explaining an example of a common information field. 16A and 16B are diagrams for explaining examples of a user information field.

Referring to FIG. 15 , the common information field may include a plurality of subfields. The STA may set the value of the uplink bandwidth subfield 420_1 among a plurality of subfields included in the common information field, and the STA identifies the uplink bandwidth based on the value of the uplink bandwidth subfield 420_1. can The uplink bandwidth subfield 420_1 may have a length L1 for defining various uplink bandwidths. For example, the length L1 of the uplink bandwidth subfield 420_1 in HE may be 2-bits to indicate one of 20Mz, 40MHz, 80MHz, and 160MHz. The length L1 of the uplink bandwidth subfield 420_1 in the EHT may be at least 3-bits to indicate one of the four bandwidths supported in the HE as well as the extended bandwidth, that is, bandwidths up to 320 MHz. have. In this specification, the uplink bandwidth may be simply referred to as a bandwidth unless otherwise specified. In some embodiments, the common information field may further include a field not shown in FIG. 15 , and in some embodiments, at least one field shown in FIG. 15 may be omitted from the common information field.

Referring to FIG. 16A , the user information field may include a plurality of subfields. In order to specify the STA, the AP may set the value of the AID12 field 425_1a among a plurality of subfields included in the user information field, and the STA may set the value of the AID12 field 425_1a based on the value of the user information field. It can be identified that In addition, in order to define at least one allocated RU, the AP may set a value of an RU allocation subfield 425_2a among a plurality of subfields included in the user information field, and the STA may set the RU allocation subfield 425_2a. At least one RU allocated to itself may be identified based on the value of .

The RU allocation subfield 425_2a may have a length L2a for defining various RU allocations. For example, the length L2a of the RU allocation subfield 425_2a in the HE may be 8-bits to indicate a single RU allocable to the STA within a bandwidth of up to 160 MHz. However, in the EHT, the RU allocation subfield 425_2a may be required to indicate multiple RUs as well as a single RU allocable to an STA within a bandwidth of up to 320 MHz. Accordingly, the length of the RU allocation subfield 426_2a is at least 8 - May be longer than bits. In some embodiments, the RU allocation subfield 425_2a for EHT may have a length of 9-bits, as described below with reference to FIG. 28A .

Referring to FIG. 16B , the user information field may include a plurality of subfills including an AID12 field 425_1b and an RU allocation subfield 425_2b. In addition, as shown in FIG. 16B , the user information field may further include a PS160 subfield 425_3 indicating a primary subband or a secondary subband. Although the PS160 subfield 425_3 in FIG. 16B is shown to correspond to a reserved area (eg, B39) of the user information field in FIG. 16A, in some embodiments the PS160 subfield 425_3 is shown in FIG. 16B. It may be arranged in a position different from that shown.

As will be described below with reference to FIG. 28B , the PS160 subfield 425_3 may be used together with the RU allocation subfield 425_2b to define various RU allocations, and thus the length (L2b) of the RU allocation subfield 425_2b. may be shorter than the length L2a of FIG. 16A . For example, the length of the RU allocation subfield 425_2b may be 8-bits. The AP may set values of the RU allocation subfield 425_2b and the PS160 subfield 425_3 among a plurality of subfields included in the user information field to define at least one allocated RU, and the STA may set the RU allocation At least one RU allocated thereto may be identified based on values of the subfield 425_2b and the PS160 subfield 425_3. 17 is a message diagram illustrating a method for communication based on extended bandwidth and multiple RUs according to an exemplary embodiment of the present disclosure. Specifically, the message diagram of FIG. 17 shows examples of operations of the AP 10 and the STA 20 communicating with each other. In some embodiments, the AP 10 may communicate with at least one STA, including the STA 20 , included in the coverage area.

Referring to FIG. 17 , in step S10, the AP 10 may generate an uplink bandwidth field. For example, the AP 10 may determine a bandwidth to be used by at least one STA including the STA 20 for uplink transmission. As described above with reference to FIG. 15, the uplink bandwidth field in the EHT may have a length of at least 3-bits, and the AP 10 may determine a bandwidth of one of 20 MHz, 40 MHz, 80 Mz, 160 MHz and 320 MHz. and the uplink bandwidth field may be set to a value corresponding to the determined bandwidth.

In step S20 , the AP 10 may allocate at least one RU to at least one STA. For example, the AP 10 may allocate a single RU to the STA 20 , and may allocate multiple RUs to the STA 20 . In some embodiments, the AP 10 may allocate a single RU to the STA 20 in the EHT the same as the HE. Examples in which the AP 10 allocates multiple RUs to the STA 20 in a given bandwidth in the EHT will be described below with reference to FIGS. 18 to 25C .

In step S30, the AP 10 may generate at least one subfield. For example, the AP 10 may generate at least one subfield included in the trigger frame based on the at least one RU allocated in step S20 . In some embodiments, as described above with reference to FIG. 16A , the RU allocation subfield in the EHT may have a length of at least 9-bits, and in step S30 the AP 10 corresponds to the allocated at least one RU. It is possible to set the RU allocation subfield to a value of . Further, in some embodiments, as described above with reference to FIG. 16B , in the EHT, the RU allocation subfield may have a length of 8-bits, and the user information field may include a PS160 subfield, in step S30 In , the AP 10 may set the RU allocation subfield and the PS160 subfield to values corresponding to at least one allocated RU. An example of step S30 will be described later with reference to FIG. 26 .

In step S40, the AP 10 may generate a trigger frame and a PPDU. For example, the AP 10 may generate a common information field including the uplink bandwidth field generated in step S10 and may generate a user information field including at least one subfield generated in step S30. have. The AP 10 may generate a trigger frame including the common information field and the user information field, and may generate a PPDU including the trigger frame.

In step S50, the AP 10 may transmit the PPDU, and the STA 20 may receive the PPDU. In step S60, the STA 20 may extract a trigger frame. For example, the STA 20 may extract a trigger frame from the PPDU received in step S50.

In step S70, the STA 20 may extract an uplink bandwidth field and at least one subfield. For example, the STA 20 may extract a common information field and a user information field from the trigger frame extracted in step S60. The STA 20 may extract an uplink bandwidth field having a length of at least 3-bits from the common information field, and may identify its own user information field based on the AID12 field, and from the identified user information field At least one subfield may be extracted.

In step S80, the STA 20 may identify at least one RU. For example, the STA 20 may identify a bandwidth based on the uplink bandwidth field extracted in step S70, and the STA 20 may identify the bandwidth based on the identified bandwidth and at least one subfield extracted in step S70. At least one allocated RU may be identified. An example of step S80 will be described later with reference to FIG. 27 .

In step S90, the STA 20 may transmit the PPDU, and the AP 10 may receive the PPDU. For example, the STA 20 may perform uplink transmission on at least one RU identified in step S80 and may transmit a PPDU to the STA 20 . The AP 10 may receive the PPDU on at least one RU allocated to the STA 20 within the bandwidth.

18 shows small size multiple RUs allocable to an STA in an OFDMA 20MHz EHT PPDU according to an exemplary embodiment of the present disclosure. Specifically, the table of FIG. 18 shows indices and combinations of small size multiple RUs allocable in a bandwidth of 20 MHz. In some embodiments, as described below with reference to FIGS. 29A and 29B , the values of the RU allocation subfield may increase in the order of the indices shown in FIG. 18 . The indices of a single RU in FIG. 18 may correspond to the indices shown in FIG. 9B .

Referring to FIG. 18 , a multi-RU including a 52-tone RU and a 26-tone RU may have three different combinations, and may be indexed as first to third multi-RUs (MRU1 to MRU3). 18 , a first multi-RU (MRU1) may include a second 52-tone RU and a second 26-tone RU, and a second multi-RU (MRU2) may include a second 52-tone RU and The fifth 26-tone RU may be included, and the third multiple RU (MRU3) may include a third 52-tone RU and an eighth 26-tone RU.

A multiple RU comprising a 106-tone RU and a 26-tone RU may have two different combinations and may be indexed as first and second multiple RUs (MRU1, MRU2). As shown in FIG. 18 , a first multi-RU (MRU1) may include a first 106-tone RU and a fifth 26-tone RU, and a second multi-RU (MRU2) includes a second 106-tone RU and a fifth 26-tone RU.

19 shows small size multiple RUs allocable to an STA in an OFDMA 40MHz EHT PPDU according to an exemplary embodiment of the present disclosure. Specifically, the table of FIG. 19 shows indices and combinations of small size multiple RUs allocable in a bandwidth of 40 MHz. In some embodiments, as described below with reference to FIGS. 29A and 29B , the values of the RU allocation subfield may increase in the order of the indices shown in FIG. 19 . The indices of a single RU in FIG. 19 may correspond to the indices shown in FIG. 10B .

Referring to FIG. 19 , a multi-RU including a 52-tone RU and a 26-tone RU may have six different combinations, and may be indexed as first to sixth multi-RUs (MRU1 to MRU6). 19 , a first multi-RU (MRU1) may include a second 52-tone RU and a second 26-tone RU, and a second multi-RU (MRU2) may include a second 52-tone RU and may include a fifth 26-tone RU, a third multiple RU (MRU3) may include a third 52-tone RU and an eighth 26-tone RU, and a fourth multiple RU (MRU4) may include a 6 52 RU - may include the eleventh 26-tone RU and the fifth multi-RU (MRU5) may include the sixth 52-tone RU and the 14th 26-tone RU, and the sixth multi-RU (MRU6) may include the 7th 52-tone RU and the 17th 26-tone RU.

A multiple RU comprising a 106-tone RU and a 26-tone RU may have four different combinations and may be indexed as first to fourth multiple RUs (MRU1 to MRU4). As shown in FIG. 19 , a first multi-RU (MRU1) may include a first 106-tone RU and a fifth 26-tone RU, and a second multi-RU (MRU2) includes a second 106-tone RU and The fifth 26-tone RU may include, the third multi-RU (MRU3) may include the third 106-tone RU and the 14th 26-tone RU, and the fourth multi-RU (MRU4) may include the fourth 106th RU. - may include a tone RU and a 14th 26-tone RU.

20 shows small size multiple RUs allocable to an STA in an OFDMA 80MHz EHT PPDU according to an exemplary embodiment of the present disclosure. Specifically, the table of FIG. 20 shows indices and combinations of small size multiple RUs allocable in a bandwidth of 80 MHz. In some embodiments, as described below with reference to FIGS. 29A and 29B , the values of the RU allocation subfield may increase in the order of the indices shown in FIG. 20 . The indices of a single RU in FIG. 20 may correspond to the indices shown in FIG. 11B .

Referring to FIG. 20 , a multiple RU including a 52-tone RU and a 26-tone RU may have 12 different combinations, and may be indexed as first to twelfth multiple RUs (MRU1 to MRU12). As shown in FIG. 20 , a first multi-RU (MRU1) may include a second 52-tone RU and a second 26-tone RU, and a second multi-RU (MRU2) may include a second 52-tone RU and may include a fifth 26-tone RU, a third multiple RU (MRU3) may include a third 52-tone RU and an eighth 26-tone RU, and a fourth multiple RU (MRU4) may include a 6 52 RU - may include the eleventh 26-tone RU and the fifth multi-RU (MRU5) may include the sixth 52-tone RU and the 14th 26-tone RU, and the sixth multi-RU (MRU6) may include the 7th 52-tone RU and the 17th 26-tone RU. Further, a seventh multi-RU (MRU7) may include a tenth 52-tone RU and a twenty-first 26-tone RU, and an eighth multi-RU (MRU8) may include a tenth 52-tone RU and a twenty-fourth 26-tone RU. A ninth multiple RU (MRU9) may include an 11th 52-tone RU and a 27th 26-tone RU, and a tenth multiple RU (MRU10) may include a 14th 52-tone RU and a 30th multiple RU (MRU10). may include a 26-tone RU, an eleventh multi-RU (MRU11) may include a 14 52-tone RU and a 33rd 26-tone RU, and a twelfth multi-RU (MRU6) may include a 15 52-tone RU RU and the 36th 26-tone RU.

A multiple RU comprising a 106-tone RU and a 26-tone RU may have eight different combinations and may be indexed as first to eighth multiple RUs (MRU1 to MRU8). As shown in FIG. 19 , a first multi-RU (MRU1) may include a first 106-tone RU and a fifth 26-tone RU, and a second multi-RU (MRU2) includes a second 106-tone RU and The fifth 26-tone RU may include, the third multi-RU (MRU3) may include the third 106-tone RU and the 14th 26-tone RU, and the fourth multi-RU (MRU4) may include the fourth 106th RU. - may include a tone RU and a 14th 26-tone RU. Further, a fifth multi-RU (MRU5) may include a fifth 106-tone RU and a 24th 26-tone RU, and a sixth multi-RU (MRU6) may include a sixth 106-tone RU and a 24th 26-tone RU. The seventh multiple RU (MRU7) may include the seventh 106-tone RU and the 33rd 26-tone RU, and the eighth multiple RU (MRU8) includes the eighth 106-tone RU and the 33rd 26-ton RUs.

Small-size RUs (ie, 26-ton RUs, 52-tone RUs, such as multiple RUs containing 52-ton RUs and 26-tone RUs and multiple RUs containing 106-tone RUs and 26-tone RUs) A multiple RU containing only a tone RU, 106-tone RU) may be referred to as a small size multiple RU. In some embodiments, only some of the small size multiple RUs may be used in a bandwidth of 80 MHz or higher. For example, as shown in FIG. 20 , some of multiple RUs including 52-tone RUs and 26-tone RUs (ie, MRU1, MRU6, MRU7, MRU12) and 106-tone RUs and 26-tone RUs Some of the multiple RUs (ie, MRU2, MRU3, MRU6, MRU7) including

21A and 21B show small size multiple RUs allocable to an STA in an OFDMA 160MHz EHT PPDU according to an exemplary embodiment of the present disclosure. Specifically, the tables of FIGS. 21A and 21B show indices and combinations of small size multiple RUs allocable in a bandwidth of 160 MHz. In some embodiments, as described below with reference to FIGS. 29A and 29B , the values of the RU allocation subfield may increase in the order of the indices shown in FIGS. 21A and 21B .

Referring to FIG. 21A , a multiple RU including a 52-tone RU and a 26-tone RU may have 24 different combinations, and may be indexed as first to 24th multiple RUs (MRU1 to MRU24). Referring to FIG. 21B , a multiple RU including a 106-tone RU and a 25-tone RU may have 16 different combinations, and may be indexed as first to sixteenth multiple RUs (MRU1 to MRU16).

22A, 22B and 22C show small size multiple RUs allocable to an STA in an OFDMA 320 MHz EHT PPDU according to an exemplary embodiment of the present disclosure. Specifically, the tables of FIGS. 22A, 22B and 22C show indices and combinations of small size multiple RUs allocable in a bandwidth of 320 MHz. In some embodiments, as described below with reference to FIGS. 29A and 29B , the values of the RU allocation subfield may increase in the order of the indices shown in FIGS. 22A , 22B and 22C .

22A and 22B , a multiple RU including a 52-tone RU and a 26-tone RU may have 48 different combinations, and may be indexed as first to 48th multiple RUs (MRU1 to MRU48). . Referring to FIG. 22C , a multiple RU including a 106-tone RU and a 25-tone RU may have 32 different combinations, and may be indexed as first to 32nd multiple RUs (MRU1 to MRU32).

23 illustrates large-size multiple RUs allocable to an STA in an OFDMA 80MHz EHT PPDU according to an exemplary embodiment of the present disclosure. Specifically, the table of FIG. 23 shows indices and combinations of large size multiple RUs allocable in a bandwidth of 80 MHz. In some embodiments, as described below with reference to FIGS. 29A and 29B , the values of the RU allocation subfield may increase in the order of the indices shown in FIG. 23 .

Referring to FIG. 23 , a multiple RU including a 484-tone RU and a 242-tone RU may have four different combinations, and may be indexed as first to fourth multiple RUs (MRU1 to MRU4).

24 illustrates large-size multiple RUs allocable to an STA in an OFDMA 160MHz EHT PPDU according to an exemplary embodiment of the present disclosure. Specifically, the table of FIG. 24 shows indices and combinations of large size multiple RUs allocable in a bandwidth of 160 MHz. In some embodiments, as described below with reference to FIGS. 29A and 29B , the values of the RU allocation subfield may increase in the order of the indices shown in FIG. 24 .

Referring to Figure 24,

A multiple RU comprising a 484-tone RU and a 242-tone RU may have eight different combinations, and may be indexed as first to eighth multiple RUs (MRU1 to MRU8). In a bandwidth of 160 MHz, four 484-tone RUs may be sequentially deployed, and eight 242-tone RUs may be sequentially deployed. 24 , the first to eighth multiple RUs may respectively correspond to unassigned combinations of eight 242-tone RUs sequentially, respectively.

A multiple RU comprising a 996-tone RU and a 484-tone RU may have four different combinations and may be indexed as first to fourth multiple RUs (MRU1 to MRU4). Two 996-tone RUs may be sequentially deployed in a bandwidth of 160 MHz, and four 484-tone RUs may be deployed sequentially. As shown in FIG. 24 , the first to fourth multiple RUs (MRU1 to MRU4) may respectively correspond to unallocated combinations of four 484-tone RUs sequentially, respectively.

A multiple RU comprising a 996-tone RU, a 484-tone RU, and a 242-tone RU may have eight different combinations, and may be indexed as first to eighth multiple RUs (MRU1 to MRU8). In a bandwidth of 160 MHz, two 996-tone RUs may be sequentially deployed, four 484-tone RUs may be sequentially deployed, and eight 242-tone RUs may be deployed sequentially. As shown in FIG. 24 , the first to eighth multiple RUs (MRU1 to MRU8) may respectively correspond to unassigned combinations of eight 242-tone RUs, respectively.

25A, 25B and 25C show large-size multiple RUs allocable to an STA in an OFDMA 320 MHz EHT PPDU according to an exemplary embodiment of the present disclosure. Specifically, FIGS. 25A, 25B and 25C show separate tables for illustrative purposes, respectively, and the tables of FIGS. 25A, 25B and 25C show indices and combinations of large size multiple RUs allocable in a bandwidth of 320 MHz. indicates. In some embodiments, as described below with reference to FIGS. 29A and 29B , the values of the RU allocation subfield may increase in the order of the indices shown in FIGS. 25A , 25B and 25C .

Referring to Figure 25a,

A multiple RU comprising a 484-tone RU and a 242-tone RU may have 16 different combinations, and may be indexed as first through sixteenth multiple RUs (MRU1 through MRU16). In a bandwidth of 320 MHz, eight 484-tone RUs may be sequentially deployed, and 16 242-tone RUs may be sequentially deployed. As shown in FIG. 25A , the first to sixteenth multiple RUs may respectively correspond to unassigned combinations of 16 242-tone RUs, respectively, sequentially.

A multiple RU comprising a 996-tone RU and a 484-tone RU may have eight different combinations, and may be indexed as first to eighth multiple RUs (MRU1 to MRU8). In a bandwidth of 320 MHz, four 996-tone RUs may be sequentially deployed, and eight 484-tone RUs may be deployed sequentially. As shown in FIG. 25A , the first to eighth multiple RUs (MRU1 to MRU8) may respectively correspond to unallocated combinations of eight 484-tone RUs sequentially, respectively.

Referring to FIG. 25B , a multiple RU including a 996-tone RU, a 484-tone RU, and a 242-tone RU may have 16 different combinations and be indexed as first to sixteenth multiple RUs (MRU1 to MRU16). can In a bandwidth of 320 MHz, 4 996-tone RUs may be sequentially deployed, 8 484-tone RUs may be sequentially deployed, and 16 242-tone RUs may be deployed sequentially. As shown in FIG. 25B , the first to sixteenth multiple RUs (MRU1 to MRU16) may respectively correspond to unallocated combinations of 16 242-tone RUs, respectively.

A multiple RU comprising two 996-ton RUs and a 484-tone RU may have 12 different combinations and may be indexed as first to twelfth multiple RUs (MRU1 to MRU12). In a bandwidth of 320 MHz, first to fourth 996-tone RUs may be sequentially disposed, and first to eighth 484-tone RUs may be sequentially disposed. As shown in FIG. 25B , the first to fifth multiple RUs (MRU1 to MRU6) are sequentially unassigned to the first to sixth 484-tone RUs in a state in which the fourth 996-tone RU is unassigned. It can correspond to each of the combinations. In addition, the seventh to twelfth multiple RUs (MRU7 to MRU12) may respectively correspond to unassigned combinations in which the third to eighth 484-tone RUs are sequentially unassigned in a state in which the first 996-tone RU is unassigned. have.

Referring to FIG. 25C , a multi-RU including three 996-tone RUs may have four different combinations, and may be indexed as first to fourth multi-RUs (MRU1 to MRU4). In a 320 MHz bandwidth, four 996-tone RUs may be sequentially deployed, and as shown in FIG. 25C , the first to fourth multiple RUs (MRU1 to MRU4) are sequentially unassigned by four 996-tone RUs, respectively. It can correspond to each of the combinations.

A multiple RU comprising three 996-tone RUs and a 484-tone RU may have 8 different combinations and may be indexed as first through eighth multiple RUs (MRU1 through MRU8). In the 320 MHz bandwidth, four 996-tone RUs may be sequentially deployed, and eight 484-tone RUs may be deployed sequentially. As shown in FIG. 25C , the first to eighth multiple RUs (MRU1 to MRU8) may respectively correspond to unassigned combinations of eight 484-tone RUs sequentially, respectively.

In the EHT, a user information field defining not only single RUs of the HE but also multiple RUs described above with reference to FIGS. 18 to 25C may be required. Examples of the user information field defining single RUs and multiple RUs in the extended bandwidth of the EHT will be described below with reference to the drawings.

26 is a flowchart illustrating a method for communication based on extended bandwidth and multiple RUs according to an exemplary embodiment of the present disclosure. Specifically, FIG. 26 shows an example of step S30 of FIG. 17 . As described above with reference to FIG. 17 , in step S30 ′ of FIG. 26 , the AP 10 may generate at least one subfield. In some embodiments, more than 9-bits included in the user information field may be used to define at least one RU allocated in the EHT. For example, as described above with reference to FIG. 16A , the RU allocation subfield may have a length of 9-bits, and the 9-bits may include at least 7-bits and at least 2-bits described below. . Also, in some embodiments, as described above with reference to FIG. 16B , the RU allocation subfield may have a length of 8-bits, and the 8-bits may include at least 7-bits described below, which will be described below. The at least 2-bits to be used may include one bit of the RU allocation subfield and one bit of the PS160 subfield. As shown in FIG. 26 , step S30 ′ may include a plurality of steps S31 to S37 , and FIG. 26 will be described later with reference to FIG. 17 .

Referring to FIG. 26 , in step S31 , the AP 10 may set at least 7-bits based on at least one RU. For example, the AP 10 may set at least 7-bits of the RU allocation subfield based on at least one RU allocated to the STA 20 in step S20 of FIG. 17 . At least one RU may be defined in a subband with only at least 7-bits, and may be defined based on at least one bit of at least 7-bits as well as at least 2-bits described below. At least 2-bits of the user information field may be set in steps (ie, S32 to S37) subsequent to step S31.

In step S32, the AP 10 may determine whether the bandwidth corresponds to two subbands. In the present specification, a subband may refer to a minimum frequency band including at least one RU allocated to the STA 20 , that is, a frequency band including a channel, and may have a width of 80 MHz, 160 MHz, or 320 MHz. In this specification, a subband may be simply referred to as a width of the subband. Accordingly, cases in which the bandwidth corresponds to two subbands in the EHT may include a case in which the subband is 80 MHz in a bandwidth of 160 MHz and a case in which the subband is 160 MHz in a bandwidth of 320 MHz. When the bandwidth includes a plurality of subbands, the plurality of subbands may include a primary subband and at least one secondary subband.

When the bandwidth corresponds to two subbands, in step S33 the AP 10 may set one bit to a value defining a subband including at least one RU in step S33, and in step S34 the AP 10 ) may set another bit based on at least one RU. That is, one bit of the at least 2-bits of the user information field may indicate one subband of the two subbands, and the other bit of the at least 2-bits is at least one bit together with at least 7-bits. RU can be defined.

If the bandwidth does not correspond to the two subbands, in step S35 the AP 10 may determine whether the bandwidth corresponds to four or more subbands. For example, cases in which the bandwidth corresponds to four subbands in the EHT may include a case in which the subband is 80 MHz in a bandwidth of 320 MHz.

When the bandwidth includes four or more subbands, the AP 10 may set at least 2-bits to a value defining a subband including at least one RU in step S36. Accordingly, at least 2-bits of the user information field may define one of four or more subbands including at least one RU defined by the at least 7-bits set in step S31.

When the bandwidth does not include four or more subbands, that is, when the bandwidth includes a single subband, the AP 10 may set at least 2-bits based on at least one RU in step S37. For example, cases in which the bandwidth includes a single subband in the EHT include the case where the bandwidth is 20 MHz, 40 MHz or 80 MHz, the case where the subband is 160 MHz in the bandwidth of 160 MHz, the case where the subband is 320 MHz in the bandwidth of 320 MHz can do.

27 is a flowchart illustrating a method for communication based on extended bandwidth and multiple RUs according to an exemplary embodiment of the present disclosure. Specifically, FIG. 27 shows an example of step S80 of FIG. 17 . As described above with reference to FIG. 17 , in step S80 ′ of FIG. 27 , the STA 20 may identify at least one RU allocated thereto. In some embodiments, as described above with reference to FIG. 16A , the RU allocation subfield may have a length of 9-bits, wherein the 9-bits may include at least 7-bits and at least 2-bits described below. can Also, in some embodiments, as described above with reference to FIG. 16B , the RU allocation subfield may have a length of 8-bits, and the 8-bits may include at least 7-bits described below, which will be described below. The at least 2-bits to be used may include one bit of the RU allocation subfield and one bit of the PS160 subfield. As shown in FIG. 27 , step S80 ′ may include a plurality of steps S81 to S87 . Hereinafter, content overlapping with the description of FIG. 26 among the description of FIG. 27 will be omitted, and FIG. 26 will be described with reference to FIG. 17 .

Referring to FIG. 27 , in step S81 , the STA 20 may identify at least one RU based on at least 7-bits. The STA 20 may identify at least one RU defined within a subband with at least 7-bits only, and at least one based on at least one of the at least 7-bits as well as at least 2-bits described below. may identify the RU of . At least 2-bits of the user information field may be analyzed in steps (ie, S82 to S87) subsequent to step S81.

In step S82, the STA 20 may determine whether the bandwidth corresponds to two subbands. If the bandwidth corresponds to two subbands, in step S83 the STA 20 may identify a subband including at least one RU based on one of the at least 2-bits, and in step S84 the STA (20) may identify at least one RU based on the other one of the at least 2-bits.

If the bandwidth does not correspond to the two sub-regions, in step S85, the STA 20 may determine whether the bandwidth corresponds to four or more sub-bands. When the bandwidth includes 4 or more subbands, the STA 20 may identify the subband including at least one RU based on at least 2-bits in step S86. On the other hand, if the bandwidth does not include 4 or more subbands, the STA 20 may identify at least one RU based on at least 2-bits in step S87.

28A and 28B are diagrams illustrating examples of a user information field according to exemplary embodiments of the present disclosure. Specifically, FIG. 28A shows an example of the RU allocation subfield included in the user information field, and FIG. 28B shows an example of the user information field including the RU allocation subfield and the PS160 subfield.

Referring to FIG. 28A , in some embodiments, the RU allocation subfield may include 9-bits, that is, first to ninth bits (X0 to X8). The third to ninth bits (X2 to X8) may correspond to at least 7-bits of FIGS. 26 and 27, and the first and second bits (X0, X1) are at least 2-bits of FIGS. 26 and 27 can respond to In some embodiments, the at least 2-bits of FIGS. 26 and 27 may include the least significant bit (LSB) of the RU allocation subfield as shown in FIG. 28A , and differently as shown in FIG. 28A , It may include a most significant bit (MSB) or both an LSB and an MSB.

Referring to FIG. 28A , as described above with reference to FIGS. 26 and 27 , when the bandwidth includes a plurality of subbands, the first bit X0 and/or the second bit X1 includes the plurality of subbands. One subband may be defined among them. As shown in the first table T1 of FIG. 28A , when the subband is 80MHz in the bandwidth of 160MHz, the second bit X1 may define the lower 80MHz or the upper 80MHz, and the subband in the bandwidth of 320MHz In the case of 80 MHz, the first and second bits X0 and X1 may define one of the lower 80 MHz and upper 80 Mz of the lower 160 MHz, and the lower 80 MHz and the upper 80 MHz of the upper 180 Mz. Accordingly, the second bit (X1) of the RU allocation subfield defining at least one RU allocated to the main 80MHz in the bandwidth of 160Mz may correspond to '0', and defines at least one RU allocated to the minor 80MHz The second bit (X1) of the RU allocation subfield may correspond to '1'.

The second table T2 of FIG. 28A shows first and second bits (X0, X1) for indicating at least one RU allocated to each 80 MHz according to the position of the main 160 MHz and/or the main 80 MHz in the bandwidth of 320 MHz. ) are the values of In the bandwidth of 160Mz, the first bit (X0) may be zero, and the third table (T3) of FIG. 28A shows that, according to the position of the main 80MHz in the bandwidth of 160MHz, at least one RU allocated to each 80MHz It represents the value of the second bit (X1) for representing . In a bandwidth of 80 MHz or less, the first bit X0 and the second bit X1 may be zero.

Referring to FIG. 28B , in some embodiments, the user information field may include an RU allocation subfield of 8-bits and a PS160 subfield of 1-bit. As shown in FIG. 28B , the RU allocation subfield may include first to eighth bits B0 to B7, and the PS160 subfield may include bits Bx. In some embodiments, the second through eighth bits (B1 through B7) of the RU allocation subfield may correspond to at least 7-bits of FIGS. 26 and 27 , and the first bit (B0) of the RU allocation subfield and a bit (Bx) of the PS160 subfield may correspond to at least 2-bits of FIGS. 26 and 27 . In some embodiments, the first bit B0 of the RU allocation subfield may be the LSB of the RU allocation subfield as shown in FIG. 28B , or may be the MSB differently as shown in FIG. 28B .

Referring to FIG. 28B , as described above with reference to FIGS. 26 and 27 , when the bandwidth includes a plurality of subbands, the first bit (B0) of the RU allocation subfield and the bit (Bx) of the PS160 subfield may define one subband among a plurality of subbands. In some embodiments, the first bit (B0) of the RU allocation subfield may indicate a major 80MHz or minor 80MHz for a single RU and/or multiple RUs from 160MHz to 80MHz or less. In addition, the first bit (B0) of the RU allocation subfield may be used to index multiple RUs for a single RU and/or multiple RUs above 80 MHz. A bit (Bx) of the PS160 subfield may indicate a major 160Mz or a minor 160MHz for a single RU and/or multiple RUs of 160MHz or less. In addition, bit (Bx) of the PS160 subfield may be used to index multiple RUs for a single RU and/or multiple RUs over 160 MHz. Accordingly, the first bit (X0) and the second bit (X1) of FIG. 28A are, according to the conditions defined by the pseudo code (CD) of FIG. 28B, the first bit (X0) of the RU allocation subfield ( B0) and the bit (Bx) of the PS160 subfield.

The fourth table (T4) of FIG. 28B is calculated from the first bit (B0) of the RU allocation subfield and the bit (Bx) of the PS160 subfield according to the position of the main 160 MHz and/or the main 80 MHz in the bandwidth of 320 MHz. The values of the first bit X0 and the second bit X1 of FIG. 28A are shown. For example, as shown in FIG. 28B, when the minor 80 MHz, the main 80 MHz, and the 160 MHz are sequentially arranged ([S80 P80 S160]), the first bit (X0) of FIG. 28A is the bit of the PS160 subfield ( Bx), and the second bit (X1) of FIG. 28A is the negation of the OR (or XOR operation result) of the first bit (B0) of the RU allocation subfield and the bit (Bx) of the PS160 subfield or logical complement). In addition, the fifth table T5 of FIG. 28B is calculated from the first bit (B0) of the RU allocation subfield and the bit (Bx) of the PS160 subfield according to the position of the main 80Mhz in the 160MHz bandwidth. It represents values of the first bit (X0) and the second bit (X1). In the 160 MHz bandwidth, the bit (Bx) of the PS160 subfield may be zero. In addition, in a bandwidth of 80 MHz or less, the bit Bx of the PS160 subfield and the first bit B0 of the RU allocation subfield may be zero. In the following, the example of FIG. 28A will be mainly described, but it is noted that the exemplary embodiments of the present disclosure may also be applied to the example of FIG. 28B .

29A and 29B are diagrams illustrating RU allocation subfields according to an exemplary embodiment of the present disclosure. Specifically, FIGS. 29A and 29B show separate tables for illustration purposes, respectively, and the tables of FIGS. 29A and 29B show the values of the RU allocation subfield and their corresponding single RUs or multiple RUs.

Referring to FIG. 29A , a small size single RU, a small size multiple RU, and a multiple RU including a 484-tone RU and a 242-tone RU may be included in a subband of 80 MHz or less. Accordingly, as shown in FIG. 29A , the first and second bits (X0, X1) of the RU allocation subband may define the position of the channel, that is, the subband to which at least one RU is allocated. 7-bits of the RU allocation subband to define a small size single RU, and a small size multiple RU described above with reference to FIGS. 18 to 25C , and multiple RUs including a 484-tone RU and a 242-tone RU That is, the third to ninth bits X2 to X8 may have values as shown in FIG. 29A .

The index of the RU may be calculated from the first and second bits (X0, X1). In some embodiments, as shown in FIG. 29A , the variable N may be calculated as “2*X0 + X1”, and the RU index may be calculated from the variable N. For example, the index of the 26-tone RU may correspond to the sum of "37*N" and the RU index of the EHT, and the index of the 52-tone RU may correspond to the sum of "16*N" and the RU index of the EHT. may correspond to a value, the index of the 106-tone RU may correspond to the sum of "8*N" and the RU index of the EHT, and the index of the 242-tone RU may correspond to the sum of "4*N" and the RU index of the EHT. may correspond to the summed value, the index of the 484-ton RU may correspond to the sum of "2*N" and the RU index of the EHT, and the index of the 996-ton RU may correspond to the sum of the RU indexes of N and EHT. can correspond to values. The index of the multi-RU including two 996-tone RUs may correspond to the sum of the first bit (X0) and the RU index of the EHT, and the index of the multi-RU including four 996-tone RUs is 1 day. and the index of the multi-RU including the 52-tone RU and the 26-tone RU may correspond to the sum of "12*N" and the RU index of the EHT, and include the 106-ton RU and the 26-tone RU. The index of multiple RUs including "8*N" and the RU index of EHT may correspond to the sum of the RU indices of "8*N" It may correspond to the sum of the RU indices. Referring to FIG. 29B , in order to define a large-size multi-RU, excluding multi-RUs including 484-tone RUs and 242-tone RUs, the first RU allocation subband is The to ninth bits X0 to X8 may have values as shown in FIG. 29B . The index of the multiple RUs of FIG. 29B may be calculated from the first bit (X0). For example, an index of a multi-RU including a 996-tone RU and a 484-tone RU may correspond to a value obtained by summing the RU index of “4*X0” and the EHT, and the 996-ton RU, the 484-ton RU and the The index of the multi-RU including the 242-tone RU may correspond to the sum of "8*X0" and the RU index of the EHT. The indices of the remaining multiple RUs may coincide with the RU indices of the EHT.

The values of the RU allocation subbands defining large-size multiple RUs, except for the multi-RU including the 484-tone RU and the 242-tone RU, will be described below with reference to FIGS. 30 to 34 .

In some embodiments, only some of both the single RU and/or multiple RUs shown in FIGS. 29A and 29B may be used for multi-user (MU) transmission. For example, MU-MIMO of EHT may be possible in a single RU and/or multiple RUs corresponding to 242 or more subcarriers. Accordingly, the AP may allocate at least one RU to a plurality of multiplexed STAs and may generate an RU allocation subfield for MU transmission.

In some embodiments, the RU allocation subfield for MU transmission may have a similar structure to the RU allocation subfield for single user (SU) transmission. For example, the RU allocation subfield for MU transmission is at least 6- that sequentially increases according to the values of the third to ninth bits (X2 to X8) in the cells hatched in FIG. 29A and the cells shown in FIG. 29B. It may contain bits. Accordingly, the AP may set at least 6-bits of the RU allocation subfield, based on the at least one RU for MU transmission, and at least 2-bits to define one of the two subbands included in the bandwidth. One bit among the two bits may be set, and two bits among at least 2-bits may be set to define one of four subbands included in the bandwidth. Accordingly, the RU allocation subfield for MU transmission may have a length of at least 8-bits.

In some embodiments, the RU allocation subfield for MU transmission may be set independently of the RU allocation subfield for SU transmission. For example, the RU allocation subfield may have one of values to indicate 28 single RUs, ie, 16 242-tone RUs, 8 484-tone RUs, and 4 996-tone RUs. In addition, the RU allocation subfield contains 67 multi-RUs, i.e., two multi-RUs each containing two 996-tone RUs, a multi-RU containing four 996-tone RUs, a 484-tone RU, and a 242-tone RU. 16 multiple RUs each containing RU, 8 multiple RUs each containing 996-ton RU and 484-ton RU, 6 multiple RUs each containing 996-ton RU, 484-ton RU and 242-ton RU Multiple RUs, 12 Multiple RUs each containing 2 996-tone RUs and 484-tone RU, 4 Multiple RUs each containing 3 996-tone RUs, and 3 996-tone RUs and values for indicating 8 multiple RUs including a 484-tone RU. Accordingly, the RU allocation subfield for MU transmission may have one of a total of 95 values, and may have a length of at least 7-bits for this purpose.

30 shows multiple RUs including a 996-tone RU and a 484-tone RU and values of an RU allocation subfield according to an exemplary embodiment of the present disclosure. 31 shows multiple RUs including a 996-tone RU, a 484-tone RU, and a 242-tone RU and values of an RU allocation subfield according to an exemplary embodiment of the present disclosure. 32 shows values of the Multiple RUs and RU Allocation subfield including two 996-tone RUs and a 484-tone RU according to an exemplary embodiment of the present disclosure. 33 shows multiple RUs including three 996-tone RUs and values of an RU allocation subfield according to an exemplary embodiment of the present disclosure. 34 shows values of the Multiple RUs and RU Allocation subfield including three 996-tone RUs and a 484-tone RU according to an exemplary embodiment of the present disclosure;

Referring to FIG. 30 , a multiple RU including a 996-tone RU and a 484-tone RU may have four different combinations within a subband, ie, 160Mz, as described above with reference to FIG. 24 . Accordingly, the first bit (X0) of the first and second bits (X0, X1) of the RU allocation subfield can define a subband (ie, 160 MHz) including multiple RUs in a bandwidth of 320Mz, while The second bit X1 may define multiple RUs together with the third to ninth bits X2 to X8. In particular, as shown in FIG. 30 , the second and third bits X1 and X2 may indicate the location of an unassigned (or punctured) 484-tone RU in a subband (ie, 160 MHz). Accordingly, as described above with reference to FIGS. 24 and 25A , in order to define multiple RUs indexed based on the location of the unassigned 484-tone RU, the RU allocation subfield is shown in FIGS. 29B and 30 . can have values.

Referring to FIG. 31 , a multiple RU including a 996-tone RU, a 484-tone RU, and a 242-tone RU may have 8 different combinations within a subband, that is, 160 MHz, as described above with reference to FIG. 24 . can Accordingly, the first bit (X0) of the first and second bits (X0, X1) of the RU allocation subfield can define a subband (ie, 160Mz) including multiple RUs in a bandwidth of 320 MHz, The second bit X1 may define multiple RUs together with the third to ninth bits X2 to X8. In particular, as shown in FIG. 31 , the second to fourth bits X1 to X3 may indicate positions of unassigned (or punctured) 242-tone RUs in a subband (ie, 160 MHz). Accordingly, as described above with reference to FIGS. 24 and 25B, in order to define multiple indexed RUs based on the location of an unassigned 242-tone RU, the RU allocation subfield is shown in FIGS. 29B and 31 . can have values.

Referring to FIG. 32 , a multiple RU comprising two 996-tone RUs and a 484-tone RU may have 12 different combinations within a subband, ie, 320 MHz, as described above with reference to FIG. 25B . . Accordingly, the first and second bits (X0, X1) of the RU allocation subfield may define multiple RUs together with the third to ninth bits (X2 to X8). In particular, as shown in FIG. 32 , the first bit X0 may indicate the location of an unassigned (or punctured) 996-tone RU in a subband (ie, 320 MHz), and the second to fourth bits (X1 to X3) may indicate the location of an unassigned (or punctured) 484-tone RU. Accordingly, as described above with reference to FIG. 25B, in order to define an indexed multiple RU based on the positions of the unassigned 996-ton RU and the 484-tone RU, the RU allocation subfield is shown in FIGS. 29B and 32 may have the values shown in .

Referring to FIG. 33 , a multiple RU comprising three 996-tone RUs may have four different combinations within a subband, ie, 320 MHz, as described above with reference to FIG. 25C . Accordingly, the first and second bits (X0, X1) of the RU allocation subfield may define multiple RUs together with the third to ninth bits (X2 to X8). In particular, as shown in FIG. 33 , the first and second bits X0 and X1 may indicate positions of unassigned (or punctured) 996-tone RUs in a subband (ie, 320 MHz). Accordingly, as described above with reference to FIG. 25C , in order to define an indexed multiple RU based on the positions of the unassigned 996-tone RU, the RU allocation subfield contains the values shown in FIGS. 29B and 33 . can have

Referring to FIG. 34 , a multiple RU comprising three 996-tone RUs and a 484-tone RU may have 8 different combinations within a subband, ie, 320 MHz, as described above with reference to FIG. 25C . . Accordingly, the first and second bits (X0, X1) of the RU allocation subfield may define multiple RUs together with the third to ninth bits (X2 to X8). In particular, as shown in FIG. 34 , the first to third bits X0 to X2 may indicate positions of unassigned (or punctured) 484-tone RUs in a subband (ie, 320 MHz). Accordingly, as described above with reference to FIG. 25C, in order to define an indexed multiple RU based on the positions of the unassigned 484-tone RU, the RU allocation subfield contains the values shown in FIGS. 29B and 34 . can have

35 is a diagram illustrating an RU allocation subfield according to an exemplary embodiment of the present disclosure. In some embodiments, as shown in FIG. 35 , the RU allocation subfield may include 9-bits, ie, first to ninth bits (X0 to X8). Compared with the example of FIG. 28, the RU allocation subfield of FIG. 35 may include a first bit (X0) for defining one of two subbands in a bandwidth of 320 MHz, that is, a lower 160 MHz and an upper 160 MHz, It may include second to eighth bits (X1 to X8) for defining at least one RU. Accordingly, the AP is based on at least one RU assigned to the STA, that is, a single RU or multiple RUs described above with reference to FIGS. 18 to 25C , at least 8-bits, that is, the second to eighth bits (X1 to X8) can be set. In addition, when the subband is 160 MHz in the bandwidth of 320 MHz, the AP may set the first bit X0 to a value indicating one of the lower 160 MHz and the upper 160 MHz.

Exemplary embodiments have been disclosed in the drawings and specification as described above. Although the embodiments have been described using specific terms in the present specification, these are used only for the purpose of explaining the technical spirit of the present disclosure and are not used to limit the meaning or the scope of the present disclosure described in the claims. . Therefore, it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible therefrom. Accordingly, the true technical protection scope of the present disclosure should be defined by the technical spirit of the appended claims.

Claims (20)

A method for a first device to communicate with at least one second device in a wireless local area network (WLAN) system, the method comprising:
allocating at least one resource unit to a second device within a bandwidth;
generating at least one subfield defining the at least one resource unit;
generating a trigger frame including a user information field including the at least one subfield; and
transmitting a physical protocol data unit (PPDU) including the trigger frame to the at least one second device;
The generating of the at least one subfield comprises:
setting at least 7-bits based on the at least one resource unit; and
and setting at least 2-bits as a value defining a subband including the at least one resource unit when the bandwidth includes at least four subbands. The method according to claim 1,
The method further comprises generating an uplink bandwidth field defining the bandwidth;
The trigger frame includes a common information field including the uplink bandwidth field,
The uplink bandwidth field, characterized in that it has a length of at least 3-bits. The method according to claim 1,
The step of allocating the at least one resource unit may include: when the bandwidth is 20 MHz in which the first to ninth 26-tone resource units or the first to fourth 52-tone resource units are sequentially deployable, 52 - allocating multiple resource units comprising a ton resource unit and a 26-ton resource unit;
The multi-resource unit includes a first multi-resource unit including the second 52-ton resource unit and the second 26-tone resource unit, the second 52-ton resource unit, and the fifth 26-tone resource unit. a second multi-resource unit including a second multi-resource unit, and a third multi-resource unit including the third 52-tone resource unit and the eighth 26-tone resource unit. 4. The method according to claim 3,
The step of allocating the at least one resource unit may include: when the bandwidth is 40 MHz in which the first to 18th 26-tone resource units or the first to 8th 52-tone resource units are sequentially deployable, to the second device allocating the multiple resource units;
The multi-resource unit may include a fourth multi-resource unit including the first to third multi-resource units, the sixth 52-tone resource unit, and the eleventh 26-tone resource unit, and the sixth 52-tone resource unit. and a fifth multi-resource unit including the 14th 26-tone resource unit, and a sixth multi-resource unit including the 7th 52-tone resource unit and the 17th 26-tone resource unit. How to. 5. The method according to claim 4,
The step of allocating the at least one resource unit may include: when the bandwidth is 80 MHz in which the first to 37th 26-tone resource units or the first to 16th 52-tone resource units are sequentially deployable, the second device is allocating the multiple resource units;
The multi-resource unit includes the second multi-resource unit, the third multi-resource unit, the fourth multi-resource unit, the fifth multi-resource unit, the tenth 52-tone resource unit, and the twenty-fourth 26-tone resource. an eighth multi-resource unit including a unit, a ninth multi-resource unit including the eleventh 52-ton resource unit and the 27th 26-tone resource unit, the 14th 52-ton resource unit, and the 30th 26- and a tenth multi-resource unit including a tone resource unit, and an eleventh multi-resource unit including the 14th 52-tone resource unit and the 33rd 26-tone resource unit. The method according to claim 1,
The allocating the at least one resource unit may include: when the bandwidth is 20 MHz in which the first to ninth 26-tone resource units or the first to second 106-tone resource units are sequentially deployable, the second device is allocating multiple resource units comprising a 106-ton resource unit and a 26-ton resource unit;
The multi-resource unit includes a first multi-resource unit including the first 106-ton resource unit and the fifth 26-tone resource unit, and the second 106-ton resource unit and the fifth 26-ton resource unit. Method characterized in that it is one of the second multi-resource unit comprising a. 7. The method of claim 6,
The step of allocating the at least one resource unit may include: when the bandwidth is 40 MHz in which the first to 18th 26-tone resource units or the first to fourth 106-tone resource units are sequentially deployable, the second device is allocating multiple resource units comprising a 106-ton resource unit and a 26-ton resource unit;
The multi-resource unit includes a third multi-resource unit including the first multi-resource unit, the second multi-resource unit, the third 106-ton resource unit and the 14th 26-tone resource unit, and the fourth 106-ton resource unit and a fourth multi-resource unit including the 14th 26-ton resource unit. 8. The method of claim 7,
The step of allocating the at least one resource unit may include: when the bandwidth is 80 MHz in which the first to 37th 26-tone resource units or the first to eighth 106-tone resource units are sequentially deployable, the second device is allocating multiple resource units comprising a 106-ton resource unit and a 26-ton resource unit;
The multi-resource unit includes: a fifth multi-resource unit including the first multi-resource unit, the fourth multi-resource unit, the fifth 106-tone resource unit, and the twenty-fourth 26-tone resource unit, and the eighth 106-ton resource unit and an eighth multi-resource unit including the 33rd 26-ton resource unit. The method according to claim 1,
The allocating the at least one resource unit may include: when the bandwidth is 80 MHz in which the first to fourth 242-tone resource units or the first to second 484-tone resource units are sequentially deployable, the second device is allocating multiple resource units comprising a 484-ton resource unit and a 242-ton resource unit;
The multi-resource unit is one of the first to fourth multi-resource units to which the first to fourth 242-tone resource units are sequentially unassigned, respectively. 10. The method of claim 9,
Allocating the at least one resource unit includes allocating the multiple resource unit to the second device when the bandwidth is 160 MHz,
The multi-resource unit is one of eight multi-resource units respectively corresponding to the first to fourth multi-resource units of lower 80 MHz and the first to fourth multi-resource units at each of upper 80 MHz A method characterized in that 11. The method of claim 10,
Allocating the at least one resource unit includes allocating the multiple resource units to the second device when the bandwidth is 320 MHz,
The multi-resource unit is one of 16 resource units corresponding to each of the 8 multi-resource units of the lower 160 MHz and the 8 multi-resource units of the upper 160 MHz, respectively. The method according to claim 1,
The allocating the at least one resource unit may include: when the bandwidth is 160 MHz in which the first to fourth 484-tone resource units or the first and second 996-tone resource units are sequentially deployable, the second device is allocating multiple resource units comprising a 996-ton resource unit and a 484-ton resource unit;
The multi-resource unit is one of the first to fourth multi-resource units to which the first to fourth 484-tone resource units are sequentially unassigned, respectively. 13. The method of claim 12,
Allocating the at least one resource unit includes allocating the multiple resource units to the second device when the bandwidth is 320 MHz,
The multi-resource unit is one of eight multi-resource units respectively corresponding to the first to fourth multi-resource units of a lower 160 MHz and the first to fourth multi-resource units of an upper 160 MHz, respectively. The method according to claim 1,
In the allocating the at least one resource unit, the bandwidth is sequentially configured such that the first to eighth 242-tone resource units, first to fourth 484-ton resource units, or first and second 996-ton resource units are sequentially assigned. allocating a multi-resource unit including a 996-tone resource unit, a 484-tone resource unit, and a 242-tone resource unit to the second device in the case of deployable 160 MHz;
The multi-resource unit is one of the first to eighth multi-resource units to which the first to eighth 242-tone resource units are sequentially unassigned, respectively. 15. The method of claim 14,
Allocating the at least one resource unit includes allocating the multiple resource units to the second device when the bandwidth is 320 MHz,
The multi-resource unit is one of 16 multi-resource units respectively corresponding to the first to eighth multi-resource units of a lower 160 MHz and the first to eighth multi-resource units of an upper 160 MHz, respectively. The method according to claim 1,
The step of allocating the at least one resource unit may include, when the bandwidth is 320 MHz in which the first to eighth 484-tone resource units or the first and fourth 996-tone resource units are sequentially deployable, to the second device. allocating a multi-resource unit comprising two 996-ton resource units and a 484-ton resource unit;
The multi-resource unit includes first to sixth multi-resource units to which the fourth 996-ton resource unit is unassigned and the first to sixth 484-ton resource units are sequentially unassigned, respectively, and the first 996-ton resource unit. - A method, characterized in that the unassigned ton resource unit and the 3rd to 8th 484-ton resource units are one of 7th to twelfth multi-resource units that are sequentially unassigned, respectively. The method according to claim 1,
The step of allocating the at least one resource unit may include: when the bandwidth is 320 MHz in which the first and fourth 996-tone resource units are sequentially deployable, multiple including three 996-tone resource units to the second device allocating resource units;
The multi-resource unit is one of the first to fourth multi-resource units to which the first to fourth 996-tone resource units are sequentially unassigned, respectively. The method according to claim 1,
The step of allocating the at least one resource unit may include, when the bandwidth is 320 MHz in which the first to eighth 484-tone resource units or the first and fourth 996-tone resource units are sequentially deployable, to the second device. allocating a multi-resource unit comprising three 996-ton resource units and a 484-ton resource unit;
The multi-resource unit is one of the first to eighth multi-resource units to which the first to eight84-tone resource units are sequentially unassigned, respectively. A first device configured to communicate with at least one second device in a wireless local area network (WLAN) system, comprising:
a transceiver configured to transmit a physical protocol data unit (PPDU) to the at least one second device;
The transceiver allocates at least one resource unit to the second device within a bandwidth, generates at least one subfield defining the at least one resource unit, and a user information field including the at least one subfield A signal processor configured to generate a trigger frame comprising: and to generate the PPDU comprising the trigger frame;
The signal processor sets at least 7-bits based on the at least one resource unit, and when the bandwidth includes at least 4 subbands, a value defining a subband including the at least one resource unit and set at least 2-bits to . A method for a second device to communicate with a first device in a wireless local area network (WLAN) system, comprising:
receiving a physical protocol data unit (PPDU) from the first device;
extracting common information from the PPDU and extracting an uplink bandwidth field from the common information;
extracting user information from the PPDU and extracting at least one subfield from the user information; and
identifying at least one resource unit within a bandwidth based on the uplink bandwidth field and the at least one subfield;
The identifying of the at least one resource unit may include, when the bandwidth includes at least 4 subbands, based on at least 2-bits including the first and second bits of the at least one subfield, and identifying a subband including at least one resource unit.

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