KR20210111662A - Apparatus and method for allocating multi-resource unit for user in a wireless local area network system - Google Patents

Abstract

Disclosed are an apparatus for allocating a multi-resource unit (RU) to users in a wireless local area network (WLAN) system, which increases spectrum efficiency and data rate in a physical layer, and a method thereof. According to the technical idea of the present disclosure, a transmission apparatus of the WLAN system comprises: a transceiver generating a physical layer convergence protocol (PLCP) protocol data unit (PPDU) including a preamble and a payload, and transmitting the generated PPDU to at least one receiving device; and a main processor controlling the transceiver. The preamble includes a plurality of training fields and a plurality of signaling fields. Any one of the plurality of signaling fields includes RU allocation information for at least one receiving device. The RU allocation information includes a first subfield indicating arrangement of an RU in a frequency domain corresponding to the PPDU and a second subfield indicating a multi-combination target RU.

Description

Apparatus and method for allocating multiple RUs to users in a WLAN system {APPARATUS AND METHOD FOR ALLOCATING MULTI-RESOURCE UNIT FOR USER IN A WIRELESS LOCAL AREA NETWORK SYSTEM}

The technical idea of the present disclosure relates to an apparatus and method for allocating multiple RUs to a user in a WLAN system.

A wireless local area network (WLAN) is a technology that connects two or more devices to each other using a wireless signal transmission method. Currently, most WLAN technologies are based on the IEEE (Institute of Electrical and Electronics Engineers) 802.11 standard. The 802.11 standard has evolved into 802.11b, 802.11a, 802.11g, 802.11n, 802.11ac and 802.11ax, and currently transmits up to 1 Gbyte/s using Orthogonal frequency-division multiplexing (OFDM) technology. speed can be supported.

In 802.11ac, which is a WLAN standard, data may be simultaneously transmitted to multiple users through a multi-user multi-input multi-output (MU-MIMO) technique. However, the WLAN system to which 802.11ac is applied intensively supports one-to-one communication and has a problem that reception performance is deteriorated in an area where users are dense.

To solve this problem, in the WLAN standard 802.11ax (also called HE; High Efficiency), subcarriers available by applying not only MU-MIMO but also Orthogonal Frequency-Division Multiple Access (OFDMA) technology. Multiple access is implemented by dividing and providing to users. Through this, the WLAN system to which 802.11ax is applied can effectively support communication in dense areas and outdoors.

Furthermore, 802.11be (also called EHT; Extremely High Throughput), the next-generation WLAN standard, supports 6GHz unlicensed frequency band, utilizes bandwidth of up to 320MHz per channel, introduces HARQ (Hybrid Automatic Repeat and reQuest), supports up to 16X16 MIMO, etc. do. 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.

An object of the technical spirit of the present disclosure is to provide an apparatus and method for efficiently allocating multiple RUs to users in a WLAN system.

In order to achieve the above object, in the transmitting apparatus of a wireless local area network (WLAN) system according to an aspect of the technical idea of the present disclosure, a PPDU (Physical PPDU) including a preamble and a payload A transceiver for generating a Layer Convergence Protocol (PLCP) protocol data unit) and transmitting the generated PPDU to at least one receiving device, and a main processor for controlling the transceiver, wherein the preamble includes a plurality of training fields (training) field) and a plurality of signaling fields, and any one of the plurality of signaling fields includes resource unit (RU) allocation information for at least one receiving device, and the RU allocation information is in the PPDU. It includes a first subfield indicating arrangement of an RU in a corresponding frequency domain and a second subfield indicating a multi-combination target RU.

In addition, in the receiving apparatus of a WLAN system according to another aspect of the present disclosure, a transceiver and a transceiver for receiving a PPDU including a preamble and a payload from a transmitting apparatus, and decoding the payload based on the preamble a main processor for controlling the , wherein the preamble includes a plurality of training fields and a plurality of signaling fields, and any one signaling field of the plurality of signaling fields includes RU allocation information for a receiving device, RU allocation information includes a first subfield indicating the arrangement of RUs in the frequency domain corresponding to the PPDU and a second subfield indicating the RU to be combined with multiple.

In addition, in the wireless communication method for allocating an RU to at least one receiving device by a transmitting device in a WLAN system according to another aspect of the technical concept of the present disclosure, generating a PPDU including a preamble and a payload, and the generated Transmitting the PPDU to at least one receiving device, wherein the preamble includes a plurality of training fields and a plurality of signaling fields, and any one of the plurality of signaling fields includes an RU for at least one receiving device. The allocation information is included, and the RU allocation information includes a first subfield indicating the arrangement of an RU in a frequency domain corresponding to the PPDU and a second subfield indicating a multiple combining target RU.

In addition, in the wireless communication method in which a receiving device is assigned an RU from a transmitting device in a WLAN system according to another aspect of the technical concept of the present disclosure, receiving a PPDU including a preamble and a payload and a pay based on the preamble Decoding the load, wherein the preamble includes a plurality of training fields and a plurality of signaling fields, and any one of the plurality of signaling fields includes RU allocation information for a receiving device, and RU allocation information includes a first subfield indicating the arrangement of RUs in the frequency domain corresponding to the PPDU and a second subfield indicating the RU to be combined with multiple.

In addition, a non-transitory computer-readable medium according to another aspect of the technical concept of the present disclosure, when executed by a main processor in a transmission device of a WLAN system, causes the transmission device to include a preamble and generating a PPDU including a payload and transmitting the generated PPDU to at least one receiving device, wherein the preamble includes a plurality of training fields and a plurality of signaling fields, and any one of the plurality of signaling fields One signaling field includes RU allocation information for at least one receiving device, and the RU allocation information includes a first subfield indicating an arrangement of RUs in a frequency domain corresponding to a PPDU and a first subfield indicating a multi-combination target RU. Stores an instruction for performing a wireless communication method including 2 subfields.

In addition, the non-transitory computer-readable medium according to another aspect of the technical concept of the present disclosure, when executed by a main processor in a receiving device of a WLAN system, causes the receiving device to receive a PPDU including a preamble and a payload. Decoding the payload based on the steps and the preamble, wherein the preamble includes a plurality of training fields and a plurality of signaling fields, and any one of the plurality of signaling fields includes RU allocation information for the receiving device. is included, and the RU allocation information includes a first subfield indicating the arrangement of RUs in the frequency domain corresponding to the PPDU and a second subfield indicating the multiple combining target RUs. A command to perform a wireless communication method Save.

According to the technical idea of the present disclosure, spectrum efficiency in a physical layer by configuring a PPDU for efficiently allocating multiple RUs to a user through an apparatus and method for allocating multiple RUs to a user in a WLAN system and data transfer rate can be improved.

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.
FIG. 7 is a diagram for explaining the structure of the HE-SIG-B field of FIG. 6 .
8 is a diagram for explaining a state in which HE MU PPDUs are arranged for each frequency band.
FIG. 9 is a view for explaining the structure of the Common field of FIG. 7 .
FIG. 10 is a view for explaining an example of the User Specific field of FIG. 7 .
11 is a view for explaining another example of the User Specific field of FIG. 7 .
12 is a diagram for explaining an example of the size and location of a resource unit (RU) usable in a 20 MHz OFDMA PPDU.
13 is a diagram for explaining an example of the size and location of an RU usable in a 40 MHz OFDMA PPDU.
14 is a diagram for explaining an example of the size and location of an RU usable in an 80 MHz OFDMA PPDU.
15 is a diagram for explaining the structure of a trigger frame.
16 is a diagram for explaining the structure of an EHT TB PPDU.
17 is a diagram for explaining the structure of an EHT MU PPDU.
18 is a diagram illustrating an example in which multiple RUs are allocated to STAs in a 20 MHz OFDMA PPDU configured with small-size RUs.
19 is a diagram for explaining an example in which multiple RUs are allocated to STAs in an 80 MHz OFDMA PPDU composed of large-size RUs.
20 is a table for explaining the conventional RU batch indexing (indexing).
21 to 23 are tables for explaining RU placement indexing according to an embodiment of the present disclosure.
24A to 26D are diagrams illustrating examples of configuring RU allocation information according to an embodiment of the present disclosure.
27 is a flowchart illustrating a wireless communication method in which a transmitting device allocates an RU to a receiving device in a WLAN system.
28 is a flowchart illustrating a wireless communication method in which a receiving device is allocated an RU from a transmitting device in a WLAN system.

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. In this specification, 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.

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 multi-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 multi-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 multi-RU allocation module 1122 may use an RU allocation algorithm, method, or policy to allocate a multi-RU to a user (eg, an STA) according to an embodiment of the present disclosure. And the PPDU generation module 1123 is the control field of the PPDU (that is, also referred to as a signaling field, hereinafter referred to as a signaling field; for example, HE-SIG-A, HE-SIG-B, EHT-SIG, etc.) Signaling and indication related to multi-RU allocation may be generated.

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 a receiving device, the transceiver 1140 may receive a PPDU including a preamble and a payload from the transmitting device. In addition, the transceiver 1140 may decode the payload based on the preamble of the received PPDU. That is, the transceiver 1140 may identify the RU allocated to the receiving device by decoding the preamble of the PPDU through an internal decoder (not shown), and based on the identified RU, the payload transmitted to the receiving device (that is, The payload received from the transmitting device) can be decoded.

Of course, the subject of the 'decoding operation' 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 receives the free PPDU Decoding the payload based on the amble will be described as an example.

Meanwhile, FIG. 2 only shows an example of the wireless communication device 1100, but 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 15 . For reference, the HE PPDU described with reference to FIGS. 3 to 15 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. FIG. 7 is a diagram for explaining the structure of the HE-SIG-B field of FIG. 6 . 8 is a diagram for explaining a state in which HE MU PPDUs are arranged for each frequency band. FIG. 9 is a view for explaining the structure of the Common field of FIG. 7 . FIG. 10 is a view for explaining an example of the User Specific field of FIG. 7 . 11 is a view for explaining another example of the User Specific field of FIG. 7 . 12 is a diagram for explaining an example of the size and location of an RU usable in a 20 MHz OFDMA PPDU. 13 is a diagram for explaining an example of the size and location of an RU usable in a 40 MHz OFDMA PPDU. 14 is a diagram for explaining an example of the size and location of an RU usable in an 80 MHz OFDMA PPDU. 15 is a diagram for explaining the structure of a trigger frame.

3 to 6 , each HE PPDU includes a preamble including a plurality of training fields and a plurality of signaling fields, and a data field. and a payload including 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+80 MHz

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 more detailed information on HE-SIG-B, see FIGS. 7 to 11 below. Please refer to to explain.

Specifically, as shown in FIG. 7 , the HE-SIG-B field includes a common field including common control information and a user-specific field including user specific control information. can do.

Here, the common field can be separately encoded from the user-specific field. In addition, the common field includes RU allocation related information and a 'CRC subfield' corresponding thereto, and may be coded as one binary convolutional coding (BCC) block. And the user-specific field is one BCC block including information for decoding the payload of two users (2 users; for example, 2 STAs) and a 'CRC subfield' corresponding thereto. can be coded as

For reference, HE-SIG-B may be a duplicate of HE-SIG-B of another frequency band.

For example, referring to FIG. 8 , HE-SIG-B transmitted in some frequency band (eg, fourth frequency band 784 ) is a corresponding frequency band (ie, fourth frequency band 784 )) In addition to the data field of , control information for a data field of another frequency band (eg, the second frequency band 782 ) may be included. Accordingly, HE-SIG-B of a specific frequency band (eg, second frequency band 782 ) duplicates HE-SIG-B of another frequency band (eg, fourth frequency band 784 ). It may be in a standard format (ie, form). For this reason, HE-SIG-B may be transmitted in an encoded form for the entire RU to be transmitted.

Meanwhile, as shown in FIG. 9, the common field of HE-SIG-B includes various subfields (RU Allocation subfield, Center 26-tone RU subfield, CRC subfield, Tail subfield). may include.

Specifically, the RU Allocation subfield may consist of the number of bits of N X 8 (N is one of 1, 2, or 4). And the RU Allocation subfield may indicate the RU allocation in the frequency domain, and may indicate the number of user fields (eg, the number of STAs) in each RU. In addition, in the case of an RU having a size greater than or equal to 106-subcarrier (ie, 106-tone) supporting MU-MIMO, the number of multiplexed users may be indicated using MU-MIMO.

For reference, N=1 for 20MHz and 40MHz HE MU PPDU, N=2 for 80MHz HE MU PPDU, and N=4 for 160MHz or 80+80MHz HE MU PPDU.

On the other hand, the Center 26-tone RU subfield consists of 1 bit, and may exist to indicate whether the total bandwidth is 80 MHz, 160 MHz, and 80+80 MHz. In addition, the CRC (Cyclical redundancy check) subfield consists of 4 bits, and may be used when an error is detected with respect to common field data. In addition, the tail subfield consists of 6 bits, is used to terminate a trellis of a convolution decoder, and may be set to 0.

Subsequently, as shown in FIGS. 10 and 11 , the user-specific field of HE-SIG-B includes various subfields (STA-ID subfield, MCS subfield, Coding subfield, etc.) can do.

For reference, in the case of a user-specific field of HE-SIG-B, a subfield configuration may be changed according to whether it is a field for MU-MIMO allocation.

Specifically, in the case of FIG. 10, when the user-specific field of HE-SIG-B is not a field for MU-MIMO allocation (ie, non-MU-MIMO), HE-SIG-B User-Specific field of STA-ID subfield (B0~B10 - Consists of 11 bits), NSTS subfield (B11~B13 - Consists of 3 bits), TX Beamforming subfield (B14 - Consists of 1 bit), MCS It can include subfield (B15~B18 - composed of 4 bits), DCM subfield (B19 - composed of 1 bit), and Coding subfield (B20 - composed of 1 bit).

The STA-ID subfield may be set to the value of the TXVECTOR parameter STA_ID. In addition, the NSTS subfield may be divided into a case where the STA-ID subfield is 2046 and a case other than 2046, and may indicate the number of space-time streams. Accordingly, when the STA-ID subfield is not 2046, the NSTS subfield may be set to the number of (space-time stream - 1). On the other hand, when the STA-ID subfield is 2046, the NSTS subfield may be set to an arbitrary value.

The TX Beamforming subfield may be divided into a case in which the STA-ID subfield is 2046 and a case other than 2046, and may be used in transmit beamforming. Accordingly, if the STA-ID subfield is not 2046, the TX Beamforming subfield is 1 (that is, when a beamforming steering matrix is applied to the waveform of the SU transmission) or 0 (the otherwise) can be set. On the other hand, when the STA-ID subfield is 2046, the TX Beamforming subfield may be set to an arbitrary value.

The MCS subfield may be divided into a case in which the STA-ID subfield is 2046 and a case other than 2046, and may indicate a modulation and coding scheme. Accordingly, when the STA-ID subfield is not 2046, the MCS subfield may be set to n (n=0, 1, 2, ..., 11/ 12-15 are reserved). On the other hand, when the STA-ID subfield is 2046, the MCS subfield may be set to an arbitrary value.

The DCM subfield may be divided into a case in which the STA-ID subfield is 2046 and a case other than 2046, and may indicate whether Dual Carrier Modulation (DCM) is used. Accordingly, if the STA-ID subfield is not 2046, the DCM subfield is 1 (ie, indicating that the payload of the corresponding user of the HE MU PPDU is modulated with DCM) or 0 (ie, the corresponding user of the HE MU PPDU) indicates that the payload is not modulated with DCM). On the other hand, when the STA-ID subfield is 2046, the DCM subfield may be set to an arbitrary value.

The coding subfield may be divided into a case in which the STA-ID subfield is 2046 and a case other than 2046, and may indicate whether BCC or LDPC is used. Accordingly, when the STA-ID subfield is not 2046, the Coding subfield may be set to 0 (using BCC) or 1 (using LDPC). On the other hand, when the STA-ID subfield is not 2046, the Coding subfield may be set to an arbitrary value.

On the other hand, in the case of FIG. 11, when the user-specific field of HE-SIG-B is a field for MU-MIMO allocation (ie, MU-MIMO), the user of HE-SIG-B- Specific fields (User-Specific field) include STA-ID subfield (B0~B10 - composed of 11 bits), Spatial Configuration subfield (B11 ~ B14 - composed of 4 bits), MCS subfield (B15 ~ B18 - composed of 4 bits) ), Reserved subfield (B19 - composed of 1 bit), and Coding subfield (B20 - composed of 1 bit).

The STA-ID subfield may be set to a value indicated by the TXVECTOR parameter STA_ID. In addition, the Spatial Configuration subfield may be used to indicate the number of spatial streams for a user (eg, STA) when MU-MIMO is allocated.

The MCS subfield may indicate a modulation and coding scheme. Accordingly, the MCS subfield may be set to n (n=0, 1, 2,..., 11/ 12-15 are reserved).

The Reserved subfield is reserved to 0 and can be set. And the Coding subfield may indicate whether BCC or LDPC is used. Accordingly, the Coding subfield may be set to 0 (using BCC) or 1 (using LDPC).

Of course, even in the case of FIG. 11 , the STA-ID subfield may be divided into a case of 2046 and a case other than 2046. That is, when the STA-ID subfield is 2046, the Spatial Configuration subfield, the MCS subfield, the Reserved subfield, and the Coding subfield may all be set to arbitrary values.

As such, since the HE-SIG-B field may be configured, a more detailed description of the HE-SIG-B will be omitted.

Referring back to FIGS. 3 to 6 , the HE-STF may be used to improve automatic gain control estimation in a multiple input multiple output (MIMO) environment or an OFDMA environment.

And HE-LTF may be used to estimate a channel in a MIMO environment or an OFDMA environment.

For reference, the size of FFT (Fast Fourier Transform)/IFFT (Inverse Fast Fourier Transform) applied to fields after HE-STF and HE-STF and the size of FFT/IFFT applied to fields before HE-STF are different. can For example, the size of the FFT/IFFT applied to the HE-STF and the fields after the HE-STF may be larger than the size of the FFT/IFFT applied to the field before the HE-STF.

For this reason, the boundary plane may not exactly match the frequency band used by the field before HE-STF and the frequency band used by the field after HE-STF and HE-STF. However, for convenience of explanation, in FIGS. 3 to 6 , the frequency band used by the fields before the HE-STF and the frequency band used by the fields after the HE-STF and HE-STF will be expressed as exactly the same.

Next, each field included in the payload will be briefly described as follows.

The data field may include data for at least one user. That is, the data field may serve to carry a physical layer service data unit (PSDU) for at least one user.

In addition, in the frequency domain of the data field, at least one RU composed of a different number of tones (that is, subcarriers) is to be placed based on RU allocation information included in the signaling field of the preamble. can

That is, as shown in FIGS. 12 to 14 , at least one RU may be disposed in the frequency domain of the data field (for reference, the horizontal axis of FIGS. 12 to 14 is the frequency domain).

First, in FIG. 12, the arrangement of RUs (resource units) 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-subcarrier RUs corresponding to each of 13 tones may exist on the left and right sides of the DC band. In addition, 26-subcarrier RUs, 52-subcarrier RUs, and 106-subcarrier 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. 12 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. 12 , a plurality of 26-subcarrier RUs may be disposed, and as shown at the bottom of FIG. 12 , one 242-subcarrier RU is disposed (in this case, 3 DC tones may be inserted into the center band).

Of course, in the example of FIG. 12 , RUs of various sizes, that is, 26-subcarrier RU, 52-subcarrier RU, 106-subcarrier RU, 242-subcarrier RU, etc. are proposed, and the specific size of these RUs is Because it can be expanded or increased, embodiments of the present disclosure are not limited to the specific size of each RU (ie, the number of corresponding tones).

Next, in FIG. 13, the arrangement of RUs (resource units) usable in a 40 MHz OFDMA PPDU is shown.

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-subcarrier RUs, 52-subcarrier RUs, 106-subcarrier RUs, and 242-subcarrier 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. 13 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. 13 , one 484-subcarrier RU may be disposed (in this case, 5 DC tones are inserted into the center band).

Of course, in the example of FIG. 13 , RUs of various sizes, that is, 26-subcarrier RU, 52-subcarrier RU, 106-subcarrier RU, 242-subcarrier RU, 484-subcarrier RU, etc. have been proposed, Since the specific size of these 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).

Finally, in FIG. 14, the arrangement of RUs (resource units) 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, seven DC tones may be inserted into the center band, that is, a direct current (DC) band. In addition, 26-subcarrier RU, 52-subcarrier RU, 106-subcarrier RU, 242-subcarrier RU, and 484-subcarrier RU 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. 14 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. 14 , one 996-subcarrier RU may be disposed (in this case, 5 DC tones are inserted into the center band).

Of course, in the example of FIG. 14 , RUs of various sizes, that is, 26-subcarrier RU (hereinafter, used in combination with RU26), 52-subcarrier RU (hereinafter, used in combination with RU52), 106-subcarrier Carrier RU (hereinafter, used interchangeably with RU106), 242-subcarrier RU (hereinafter, used interchangeably with RU242), 484-subcarrier RU (hereinafter, used interchangeably with RU484), 996-subcarrier RU (Hereinafter, used interchangeably with RU996), etc. have been proposed, since the specific size of such RU can be expanded or increased, the embodiment of the present disclosure provides the specific size of each RU (that is, the number of corresponding tones) is not limited to

For reference, the RU positions available in the 40 MHz OFDMA PPDU are equivalent to two replicas of the RU positions available in the 20 MHz OFDMA PPDU. Also, the RU positions available in the 80 MHz OFDMA PPDU are equivalent to two copies of the RU positions available in the 40 MHz OFDMA PPDU. In addition, one OFDMA PPDU may include a combination of different RU sizes in each of the RU242 boundaries.

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

Referring back to FIGS. 3 to 6 , the Packet Extension (PE) has a duration of 4us, 8us, 12us or 16us, and an additional receive processing time at the end of the HE PPDU. ) can be provided.

As described above, since each field of the preamble and payload of the HE PPDU is configured, any one of the above-described HE PPDUs may be applied to the embodiment of the present disclosure.

For reference, 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 performs different frequencies for each of the one or more STAs based on OFDMA. Resources may be allocated as uplink transmission resources. 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 , and this trigger frame is illustrated in FIG. 15 .

Specifically, the trigger frame allocates 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 MAC frame and may be included in a PPDU.

In addition, the trigger frame may be transmitted through the PPDU shown in FIGS. 3 to 6 or may be transmitted through a PPDU specially designed for the trigger frame. For reference, when transmitted through the PPDU shown in FIGS. 3 to 6 , a trigger frame may be included in the data field.

Specifically, as shown in FIG. 15 , 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. And the TA field 415 includes address information of a device (eg, AP) that transmits the trigger frame, and the common information field 420 includes a receiving device (eg, an AP) that receives the trigger frame. For example, common control information applied to the STA) may be included.

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.

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 an “RU allocation 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.

As such, various HE PPDUs are used in the IEEE standard (ie, 802.11ax), and an embodiment of the present disclosure provides a signaling field (eg, HE-SIG-A or HE-SIG-B) of the various HE PPDUs described above. ) can be implemented in

That is, 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, an AP) provides a plurality of receiving devices (eg, It relates to a method and apparatus for allocating multiple RUs to at least one of STAs. Accordingly, in an embodiment of the present disclosure, a method and an apparatus for configuring a signaling field indicating information on multiple RUs allocated to each receiving apparatus (eg, STA) are disclosed. However, embodiments of the present disclosure are applicable even when the STA transmits data to the STA and the STA transmits data to the AP. In addition, embodiments of the present disclosure may be applied not only to a downlink OFDMA scheme and an uplink OFDMA scheme, but also to an environment supporting a single user, such as a single user (SU) PPDU.

Furthermore, embodiments of the present disclosure may 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 implemented in a signaling field (eg, EHT-SIG field) of an Extremely High Throughput (EHT) PPDU. Referring to FIG. 17, an EHT PPDU used in the IEEE standard (ie, 802.11be) will be described. For reference, the EHT PPDU described in FIGS. 16 and 17 may be generated by the wireless communication device 1100 of FIG. 2 .

16 is a diagram for explaining the structure of an EHT TB PPDU. 17 is a diagram for explaining the structure of an EHT MU PPDU.

16 and 17, respectively, 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 including

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. 16 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. 17 is 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. 16 , 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 the trigger frame of FIG. 15 described above.

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 to be described later (that is, information composed of an 'RU Allocation subfield' and an 'Additional RU Allocation subfield' described later), and a 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. .

As such, since the EHT-SIG field may be configured, a more detailed description of the EHT-SIG will be omitted.

As such, various EHT PPDUs are used in the IEEE standard (ie, 802.11be), and each field of the preamble and payload of the EHT PPDU may be configured as described above. It may be implemented in the signaling field (eg, U-SIG or EHT-SIG) of the PPDU.

That is, the multi-RU allocation method (ie, the signaling field configuration method for multi-RU allocation) according to the embodiment of the present disclosure can be applied to both the signaling field of the HE PPDU and the signaling field of the EHT PPDU. Hereinafter, FIG. 18 A method for allocating multiple RUs according to an embodiment of the present disclosure will be described with reference to FIG. 26 .

18 is a diagram illustrating an example in which multiple RUs are allocated to STAs in a 20 MHz OFDMA PPDU configured with small-size RUs. 19 is a diagram for explaining an example in which multiple RUs are allocated to STAs in an 80 MHz OFDMA PPDU composed of large-size RUs. 20 is a table for explaining conventional RU batch indexing. 21 to 23 are tables explaining RU placement indexing according to an embodiment of the present disclosure. 24A to 26D are diagrams illustrating examples of configuring RU allocation information according to an embodiment of the present disclosure.

For reference, the method of configuring the signaling field of the PPDU to be described below will be described on the assumption that it can be applied to both the HE PPDU and the EHT PPDU.

and RU is a single RU of any one of 26-subcarrier RU, 52-subcarrier RU, 106-subcarrier RU, 242-subcarrier RU, 484-subcarrier RU, and 996-subcarrier RU or 26+52- subcarrier RU (multiple RU of RU26+RU52), 52+26-subcarrier RU (multiple RU of RU52+RU26), 26+106-subcarrier RU (multiple RU of RU26+RU106), 106+26-subcarrier contains multiple RUs of any one of RU (multiple RU of RU106+RU26), 484+242-subcarrier RU (multiple RU of RU484+RU242), and 484+996-subcarrier RU (multiple RU of RU484+RU996) Explain what you can do with the premise.

First, referring to FIGS. 18 and 19, in an example in which multiple RUs are allocated to an STA in a 20 MHz OFDMA PPDU composed of a small-size RU, and an 80 MHz OFDMA PPDU composed of a large-size RU An example in which multiple RUs are allocated to an STA is shown.

For reference, for efficiency of multi-RU allocation, RUs may be divided into small-size RUs and large-size RUs according to their sizes.

Here, the small size RU may be any one of 26-subcarrier RU, 52-subcarrier RU, and 106-subcarrier RU, and the large size RU may be 242-subcarrier RU, 484-subcarrier RU, and 996. - May be any one of subcarrier RUs.

Meanwhile, in the related art, when 7 RUs are arranged in a 20 MHz OFDMA PPDU, 7 STAs receive 1 RU each to receive data from the AP.

However, in the embodiment of the present disclosure, through the multi-RU allocation method, a specific STA may receive data from the AP by being allocated a plurality of RUs (ie, multiple RUs).

Accordingly, as shown in FIG. 18 (small size RU case), STA-2 receives data from the AP by being allocated RU26+RU52 (ie, 26-subcarrier RU + 52-subcarrier RU), which is a multi-RU. STA-4 may receive data from the AP by being allocated RU52+RU26 (ie, 52-subcarrier RU + 26-subcarrier RU), which is a multi-RU. Of course, the remaining STAs (ie, STA-1, STA-3, STA-5) may receive data from the AP by being allocated one RU as in the prior art.

In addition, as shown in FIG. 19 (large size RU case), STA-2 is assigned a multi-RU RU242+RU484 (ie, 242-subcarrier RU + 484-subcarrier RU) to receive data from the AP. can Of course, the remaining STA (ie, STA-1) may receive data from the AP by being allocated one RU as in the prior art.

In this way, when the STA receives data through multiple RUs, the corresponding STA should know which multi-RU is allocated to itself through the signaling field. Accordingly, an embodiment of the present disclosure proposes a method for configuring a signaling field indicating information on multiple RUs allocated to an STA, and this will be described in more detail with reference to FIGS. 20 to 26 .

First, referring to FIG. 20 , a table T1 describing conventional RU placement indexing is shown, and referring to FIGS. 21 to 23 , a table T2 describing RU placement indexing according to an embodiment of the present disclosure ) is shown. Accordingly, when describing the method for configuring a signaling field according to an embodiment of the present disclosure, basic reference to T1 and T2 will be described.

For reference, T1 and T2 each visually display the RU allocation information included in the signaling field of the PPDU (eg, any one of HE-SIG-A, HE-SIG-B, U-SIG, and EHT-SIG). Tables shown are

In the embodiment of the present disclosure, in order to transmit multi-RU allocation information through the PPDU, an additional RU allocation subfield of N bits (N is a natural number greater than or equal to 1) is added to the signaling field of the PPDU. It is used by mixing with the second subfield)' to be newly defined. And in the embodiment of the present disclosure, an 8-bit 'RU allocation subfield (hereinafter, used interchangeably with the first subfield)' existing in the existing signaling field and a newly added N-bit 'addition' A method for configuring a signaling field capable of indicating multi-RU allocation information allocated to each STA through combination/combination of an 'Additional RU allocation subfield (second subfield)' is proposed.

However, for convenience of description, in the embodiment of the present disclosure, a case in which the 'N bits' is '2 bits' will be described as an example.

For reference, when the embodiment of the present disclosure is applied to 802.11be, RU allocation signaling in the common field of EHT-SIG covers various supported RU combinations. To do this, a scheme for adding an Additional RU Allocation subfield of 2 bits to the RU Allocation subfield in the common field of the EHT-SIG is implemented in an embodiment of the present disclosure.

Of course, even in this case, the mapping scheme for RU allocation using the 8-bit RU Allocation subfield in 802.11ax may be reused when only one RU is allocated per one STA. This is because even if the multi-RU allocation signaling proposed in the embodiment of the present disclosure relates to 802.11be, it can share the same logic as 802.11ax, thereby reducing the logic of the non-AP STA. because it can

Meanwhile, for convenience of description, a method of configuring the signaling field with a small-size multiple RU and a method of configuring a signaling field with a large-size multiple RU will be separately described. In addition, it is assumed that the small size multiple RU is formed by combining and combining a plurality of contiguous RUs (contiguous RUs), and the large size multiple RU is formed by combining and combining a plurality of contiguous or discontinuous RUs. do.

First, with reference to FIGS. 24A and 24B , a method of configuring a signaling field with a small size multiple RU will be described.

Small size multi-RU includes RU26+RU52 (case where RU26 is placed in lower frequency band than RU52), RU52+RU26 (case where RU52 is placed in lower frequency band than RU26), RU26+RU106 (case where RU26 is lower frequency than RU26) There may be a case disposed in the band) and RU106+RU26 (a case in which RU106 is disposed in a lower frequency band than the RU26).

For reference, in the embodiment of the present disclosure, a 52-subcarrier RU disposed at at least one end of both ends of the frequency domain (eg, disposed in column #1 or #9) cannot be multi-combined with other RUs. Of course, a 52-subcarrier RU disposed at at least one end of both ends of the frequency domain (eg, disposed in column #1 or #9) may be multi-combined with other RUs. However, in the embodiment of the present disclosure, for convenience of description, a 52-subcarrier RU disposed at at least one end of both ends of the frequency domain (eg, disposed in column #1 or #9) is multiple with other RUs. An example that cannot be combined will be described as an example.

Specifically, referring to FIGS. 24A and 24B , a case of 'RU allocation subfield=6' is illustrated.

For reference, FIG. 24A is a case illustrated in T1, and FIG. 24B is a case illustrated in T2.

Referring to FIG. 24A, in the prior art, when 'RU allocation subfield = 6', the number of entries = 1; that is, RU26, RU26, RU52, RU26, RU52, RU26, RU26) can exist. And in this case, information on multi-RU allocation cannot be displayed through the RU allocation subfield.

For reference, when a single RU is any one of 106-subcarrier RU, 242-subcarrier RU, 484-subcarrier RU, and 996-subcarrier RU, a single RU includes a plurality of receiving devices (that is, up to 16 receiving devices). device) is allocable, and when the single RU is any one of a 26-subcarrier RU and a 52-subcarrier RU, there may be one receiving device allocated to the single RU. Accordingly, when 'RU allocation subfield=6', one receiving device (eg, STA) may be allocated to each RU.

However, referring to FIG. 24B , in the embodiment of the present disclosure, multiple RUs may be defined through a newly added 2-bit 'Additional RU Allocation subfield'.

Specifically, when 'Additional RU allocation subfield=00', a case where multiple RUs do not exist is indicated, and when 'Additional RU allocation subfield=01', multiple RUs of RU26+RU52 (that is, 26+52 multi- RU) may be displayed. And when 'Additional RU allocation subfield=10', a case where multiple RUs of RU52+RU26 (ie, 52+26 multi-RU) exist is indicated, and when 'Additional RU allocation subfield=11', RU26+RU52 A case in which multiple RUs of , and multiple RUs of RU52+RU26 exist at the same time may be indicated.

That is, in the embodiment of the present disclosure, by adding the 2-bit 'Additional RU Allocation subfield', not only the single RU allocation case shown in FIG. 24A but also the multi-RU allocation case may be indicated.

For reference, if the multi-RU is any one of 26+106-subcarrier RU, 106+26-subcarrier RU, 484+242-subcarrier RU, and 484+996-subcarrier RU, the multi-RU has a maximum of 16 When a receiving device is assignable and the multi-RU is any one of a 26+52-subcarrier RU and a 52+26-subcarrier RU, one receiving device may be allocated to the multiple RUs. Accordingly, when 'RU allocation subfield=6', one receiving device (ie, STA) may be allocated to each multiple RUs (RU26+RU52 or RU52+RU26).

For reference, FIG. 24B shows that the Center 26-tone RU (RU26 disposed in #5 column; that is, shown in FIG. 12 as a 26-subcarrier RU disposed in the center of the frequency domain) is excluded from the multi-RU combination target. This table is assuming that That is, the Center 26-tone RU cannot be combined with the RU52 arranged adjacently to form a multi-RU of RU26+RU52 or a multi-RU of RU52+RU26.

Of course, assuming that the Center 26-tone RU can also form multiple RUs, the multi-RU allocation case can be extended by adding the number of bits of the 'Additional RU allocation subfield', and through this, multiple RUs for the added case can be signaled.

However, for convenience of explanation, in the embodiment of the present disclosure, a case in which the Center 26-tone RU is excluded from the multi-RU combination (that is, the Center 26-tone RU cannot be combined with the RU52 disposed adjacently) is taken as an example. let me explain

Subsequently, referring to FIGS. 25A and 25B , a case of 'RU allocation subfield=128-191' is illustrated.

For reference, FIG. 25A is a case illustrated in T1, and FIG. 25B is a case illustrated in T2.

Referring to FIG. 25A , conventionally, when 'RU allocation subfield=128-191', there may be 64 cases (Number of entries=64; that is, RU106, RU26, RU106). And in this case, information on multi-RU allocation cannot be displayed through the RU allocation subfield.

For reference, '10y2y1y0z2z1z0' is indicated in the 'RU allocation subfield' of FIG. 25A. Here, y2y1y0 means the number of STAs that can be allocated to RU106 arranged in columns #1 to #4, and can be defined as 2^2 Х y2 + 2^1 Х y1 + y0 + 1 (up to 8 STAs). have. In addition, z2z1z0 means the number of STAs allocable to RU106 arranged in columns #6 to #9, and may be defined as 2^2 Х z2 + 2^1 Х z1 + z0 + 1 (up to 8 STAs). Accordingly, based on the combination between the maximum number of STAs allocable to RU106 arranged in columns #1 to #4 and the maximum number of STAs allocable to RU106 arranged in columns #6 to #9, the total number of 64 cases (index The number from 128 to index 191 also coincides with 64) may exist.

However, referring to FIG. 25B , in an embodiment of the present disclosure, multiple RUs may be defined through a newly added 2-bit 'Additional RU Allocation subfield'.

Specifically, when 'Additional RU allocation subfield=00', a case where multiple RUs do not exist is indicated, and when 'Additional RU allocation subfield=01', multiple RUs of RU106+RU26 (that is, 106+26 multi- RU) may be displayed. And when 'Additional RU allocation subfield=10', it is displayed when multiple RUs of RU26+RU106 (ie, 26+106 multi-RU) exist, and when 'Additional RU allocation subfield=11', reserved (reserved) ) can be expressed as

Of course, the number of cases per index (00, 01, 10, 11) of the second subfield may be 64 according to the same principle as described with reference to FIG. 25A .

And, the number of RU allocable cases at a specific index (eg, 128-191) of the first subfield (eg, the total number of cases corresponding to 00, 01, and 10 of the second subfield, respectively) The number of RU allocation cases that can be indicated by a combination of 8 bits of the first subfield and 2 bits of the second subfield (for example, corresponding to each of 00, 01, 10, 11 of the second subfield) If there are many), unnecessary sub-indexes (e.g., 128 11) of -91 may be indicated as reserved.

That is, in the embodiment of the present disclosure, by adding a 2-bit 'Additional RU Allocation subfield', not only the single RU allocation case shown in FIG. 25A but also the multi-RU allocation case may be indicated.

In summary, as shown in FIGS. 24B and 25B , in the embodiment of the present disclosure, all small-size multiple RU combinations shown in FIGS. 21 to 23 can be displayed through the 2-bit 'Additional RU Allocation subfield'. have.

Next, referring to FIGS. 26A to 26D , a case of 'RU allocation subfield=80-87' is illustrated.

For reference, FIG. 26A is a case illustrated in T1.

Referring to FIG. 26A, conventionally, in the case of 'RU allocation subfield = 80-87', there may be eight cases (Number of entries = 8; that is, RU106, RU26, RU52, RU26, RU26). And in this case, information on multi-RU allocation cannot be displayed through the RU allocation subfield.

For reference, '01010y2y1y0' is indicated in the 'RU allocation subfield' of FIG. 26A, where y2y1y0 means the number of STAs that can be allocated to RU106 arranged in columns #1 to #4, and 2^2 Х It may be defined as y2 + 2^1 Х y1 + y0 + 1 (up to 8 STAs). Accordingly, based on the maximum number of STAs that can be allocated to RU106 arranged in columns #1 to #4, there may be a total of eight cases (the number from index 80 to index 87 is also equal to eight).

However, referring to FIG. 26B , multiple RUs may be defined through a newly added 2-bit 'Additional RU Allocation subfield'.

Specifically, when 'Additional RU allocation subfield=00', a case where multiple RUs do not exist is indicated, and when 'Additional RU allocation subfield=01', multiple RUs of RU106+RU26 (that is, 106+26 multi- RU) may be displayed. And when 'Additional RU allocation subfield=10', a case where multiple RUs of RU52+RU26 (ie, 52+26 multi-RU) exist is indicated, and when 'Additional RU allocation subfield=11', RU106+RU26 A case where multiple RUs of RU52+RU26 and RU52+RU26 exist at the same time may be indicated.

Of course, the number of cases per index (00, 01, 10, 11) of the second subfield may be eight according to the same principle as described with reference to FIG. 26A .

However, in the case of FIG. 26B, the number of STAs allocable to RU106 or RU106+RU26 is 8, and 16 STAs cannot be allocated to RU106 or RU106+RU26 by the signaling field configuration method of FIG. 26B.

Accordingly, referring to FIG. 26C , a method of supporting 16 STAs by newly adding 1 bit to the 'RU allocation subfield' is illustrated.

Specifically, '01010y3y2y1y0' is indicated in the 'RU allocation subfield' of FIG. 26C. Here, y3y2y1y0 means the number of STAs that can be allocated to RU106 or RU106+RU26, can

That is, by changing the configuration method of the 'RU allocation subfield' from the existing y2y1y0 method to the y3y2y1y0 method with one bit added, a greater number of STAs can be supported (that is, up to 8 STAs can support up to 16 STAs) can

However, in the case of the method of FIG. 26C, the 'RU allocation subfield' of the existing PPDU signaling field cannot be used as it is, and the number of bits of the 'RU allocation subfield' is increased. Therefore, while maintaining the definition of the 'RU allocation subfield' of the existing PPDU signaling field, a method capable of simultaneously supporting up to 16 STAs is required.

Accordingly, referring to FIG. 26D, in the embodiment of the present disclosure, up to 16 STAs are provided through an index indicated as 'reserved' in 'RU allocation subfield' and 'Additional RU allocation subfield'. A supported RU or multi-RU allocation method may be defined.

For example, '216-223', which is an index indicated as 'reserved' in the 'RU allocation subfield', may be used to support up to 16 STAs.

Specifically, as shown in FIG. 26D, when 'RU allocation subfield = 80-87' and 'Additional RU allocation subfield = 0y3', a case in which multiple RUs do not exist is indicated, and 'RU allocation subfield = 80 -87' and 'Additional RU allocation subfield=1y3', it may indicate a case in which multiple RUs of RU106+RU26 (ie, 106+26 multi-RU) exist. And when 'RU allocation subfield=216-223' and 'Additional RU allocation subfield=0y3', multiple RUs of RU52+RU26 (that is, 52+26 multi-RU) are present. When subfield=216-223' and 'Additional RU allocation subfield=1y3', a case in which multiple RUs of RU106+RU26 and RU52+RU26 coexist may be indicated.

For reference, when the index of the 'Additional RU allocation subfield' is 0y3, the case of (00, 01) may exist, and when the index of the 'Additional RU allocation subfield' is 1y3, the case of (10, 11) exists. can

Accordingly, when the index of the 'Additional RU allocation subfield' is 00 (that is, y3 = 0), the number of cases for 1 to 8 STAs is supported according to the calculation principle of y3y2y1y0, and the index of the 'Additional RU allocation subfield' When is 01 (ie, y3=1), the number of cases for 9 to 16 STAs may be supported according to the calculation principle of y3y2y1y0.

For example, if 'RU allocation subfield = 80-87' and 'Additional RU allocation subfield = 00', 1 to 8 STAs can be allocated to RU106, 'RU allocation subfield = 80-87', ' When the Additional RU allocation subfield = 01', 9 to 16 STAs can be allocated to RU106, and a total number of 16 cases (Number of entries; 16) may be displayed.

Of course, even when 'RU allocation subfield=216-223' and 'Additional RU allocation subfield=0y3', the same allocation scheme may be applied.

Similarly, when the index of the 'Additional RU allocation subfield' is 10 (that is, y3 = 0), the number of cases for 1 to 8 STAs is supported according to the calculation principle of y3y2y1y0, and the index of the 'Additional RU allocation subfield' is When 11 (ie, y3=1), the number of cases for 9 to 16 STAs may be supported according to the calculation principle of y3y2y1y0.

For example, if 'RU allocation subfield=80-87' and 'Additional RU allocation subfield=10', 1 to 8 STAs can be allocated to multiple RUs of RU106+RU26, and 'RU allocation subfield=80- 87' and 'Additional RU allocation subfield = 11', 9 to 16 STAs can be allocated to multiple RUs of RU106 + RU26. A total of 16 cases (Number of entries; 16) can be displayed. .

Of course, even when 'RU allocation subfield=216-223' and 'Additional RU allocation subfield=1y3', the same allocation scheme may be applied.

That is, in the embodiment of the present disclosure, a combination of 8 bits of the first subfield and 2 bits of the second subfield can indicate 16 as the maximum number of receiving devices allocable to an RU.

However, as in the case of FIG. 26B , when a combination of 8 bits of the first subfield and 2 bits of the second subfield cannot indicate some of the number of RU allocable cases in a specific index of the first subfield , in an embodiment of the present disclosure, the number of some cases that cannot be indicated may be indicated by a combination of 8 bits of an index indicated as reserved in the first subfield and 2 bits of the second subfield. .

Here, the meaning of the 'index indicated as reserved in the first subfield' will be described by taking 'RU allocation subfield=216-223' as an example.

'RU allocation subfield=216-223' should originally be indicated as reserved, as indicated in T1 of FIG. 20, but in the embodiment of the present disclosure, as shown in FIG. 22, '80-87 ' May be used to sub-display some of the number of cases in the index. That is, the 'index indicated as reserved in the first subfield' is an index that should be indicated as reserved originally, but is used to sub-display some of the numbers of other indexes as needed. It can mean an index to be

In summary, in the embodiment of the present disclosure, in the case, the number of multiplexed STAs in the RU (ie, single RU) or multiple RUs is determined by the reserved value of the 'RU Allocation subfield' and the 1-bit 'Additional RU'. It can be displayed as a combination of 'Allocation subfield'.

That is, 1-bit 'Additional RU Allocation subfield (y3)' is used to indicate the number of RUs (ie, single RU) or multiplexed STAs within multiple RUs, and the remaining bits of 'Additional RU Allocation subfield' are multiple RU combinations can be used to indicate

As described above, in the embodiment of the present disclosure, the method of configuring the signaling field with the small size multiple RU is implemented in the above-described way. Hereinafter, a large size using the table T2 shown in FIGS. 21 to 23 is used. A method of configuring the signaling field with multiple RUs will be described.

For large-size multiple RUs, RU484+RU242 (including both the case where RU484 is deployed in a lower frequency band than RU242 and the case where RU484 is deployed in a higher frequency band than RU242), RU484+RU996 (RU484 is deployed in a lower frequency band than RU996) Including both the case where the RU484 is located in a higher frequency band than the RU996).

Here, referring to FIG. 23 , a case of 'RU allocation subfield=224-239' and a case of 'RU allocation subfield=240-255' are shown.

For reference, conventionally, as shown in T1 of FIG. 20 , when 'RU allocation subfield=224-255', reserved may be displayed.

However, referring to FIG. 23, in the embodiment of the present disclosure, the index of the 'RU allocation subfield' that has conventionally indicated reserved (eg, RU allocation subfield='224-239', '240- 255', a large-size multiple RU may be defined through 8 bits (indicated as reserved in T1 of FIG. 20) and an 'Additional RU Allocation subfield' of 2 newly added bits.

Specifically, when 'RU allocation subfield=224-239', a multi-RU allocation case of RU484+RU242 may be displayed.

More specifically, when 'Additional RU allocation subfield = 00', a case in which RU242, RU242, and RU484 are arranged in the order is displayed, but a case in which the second RU242 is the target of multiple combinations with RU484 may be displayed. And when 'Additional RU allocation subfield = 01', a case in which RU242, RU242, and RU484 are arranged in the order is displayed, but a case in which the first RU242 is a target of multiple combinations with RU484 may be displayed. Also, when 'Additional RU allocation subfield = 10', a case in which RU484, RU242, and RU242 are arranged in the order is displayed, but a case in which the second RU242 is a target of multiple combinations with RU484 may be displayed. And when 'Additional RU allocation subfield = 11', a case in which RU484, RU242, and RU242 are arranged in the order is displayed, but a case where the first RU242 is a target of multiple combinations with RU484 may be displayed.

Meanwhile, when 'RU allocation subfield=240-255', a multi-RU allocation case of RU484+RU996 may be displayed.

More specifically, when 'Additional RU allocation subfield = 00', a case in which RU484, RU484, and RU996 are arranged in the order is displayed, but a case in which the second RU484 is a target of multiple combinations with RU996 may be displayed. And when 'Additional RU allocation subfield = 01', a case in which RU484, RU484, and RU996 are arranged in the order is displayed, but a case in which the first RU484 is a target of multiple combinations with RU996 may be displayed. In addition, when 'Additional RU allocation subfield=10', a case in which RU996, RU484, and RU484 are arranged in the order is displayed, but a case where the second RU484 is a target of multiple combinations with RU996 may be displayed. And when 'Additional RU allocation subfield = 11', a case in which RU996, RU484, and RU484 are arranged in the order is displayed, but a case in which the first RU484 is a target of multiple combinations with RU996 may be displayed.

In summary, in the embodiment of the present disclosure, in the above two cases, the number of RUs (ie, single RU) or multiplexed STAs within multiple RUs can be displayed only with the reserved value of the 'RU Allocation subfield'. have. And in these cases, the 2-bit 'Additional RU Allocation subfield' may be used only to indicate a multi-RU combination.

For reference, '1110y3y2y1y0' is indicated in 'RU allocation subfield=224-239' of FIG. 23 . Here, y3y2y1y0 means the number of STAs that can be allocated to multiple RUs of RU484+RU242, and is defined as 2^3 Х y3 + 2^2 Х y2 + 2^1 Х y1 + y0 + 1 (up to 16 STAs). can be

Accordingly, the number of cases per index (00, 01, 10, 11) of the second subfield of 'RU allocation subfield=224-239' may be 16, respectively.

In addition, '1111y3y2y1y0' is indicated in 'RU allocation subfield=240-255' of FIG. 23 . Here, y3y2y1y0 means the number of STAs that can be assigned to multiple RUs of RU484+RU996, and is defined as 2^3 Х y3 + 2^2 Х y2 + 2^1 Х y1 + y0 + 1 (up to 16 STAs). can be

Accordingly, the number of cases per index (00, 01, 10, 11) of the second subfield of 'RU allocation subfield=224-239' may be 16, respectively.

For reference, the 'RU Allocation subfield' signals information on RU allocation for each subchannel corresponding to each 20 MHz. That is, the 'RU Allocation subfield' may set RU allocation information in units of 20 MHz subchannels.

For this reason, in order to signal multiple RUs of RU484+RU242 or multiple RUs of RU484+RU996 through 'RU Allocation subfield' + 'Additional RU allocation subfield', 'RU Allocation' so that multiple RUs are allocated over a plurality of 20MHz subchannels Indices of 'subfield' and 'Additional RU Allocation subfield' should be set.

For example, in order to signal multiple RUs of RU484+RU242, a 242-tone RU of a specific 20MHz subchannel (ie, 242-subcarrier RU) is a multiple RU of RU484+RU242 (ie, 484+242-subcarrier RU). ), an entry (ie, index) indicating that it is used needs to be added. Accordingly, the corresponding entry may be added using a reserved value of the 'RU Allocation subfield'.

Specifically, the index of the 'RU Allocation subfield' and the 'Additional RU Allocation subfield' indicating 20 MHz at which the multiple RUs of RU484+RU242 or the multiple RUs of RU484+RU996 start are shown in FIG. 23 (for example, the 'RU allocation subfield =224-239' + 'Additional RU Allocation subfield=00/01/10/11' or 'RU allocation subfield=240-255' + 'Additional RU Allocation subfield=00/01/10/11') can And, in the embodiment of the present disclosure, the index (eg, 'RU allocation subfield = 116 or 117 in FIG. 20) previously indicated as reserved in the 'RU allocation subfield' is '484 + 242 It is used as an index (eg, 'RU allocation subfield=116' or 'RU allocation subfield=117' in FIG. 23) indicating a 20MHz subchannel used for multiple RUs or multiple RUs of 484+996, RU484+ Multiple RUs of RU484+RU242 or multiple RUs of RU484+RU996 may also be allocated to 20MHz subchannels that appear after the first 20MHz subchannel from which multiple RUs of RU242 or multiple RUs of RU484+RU996 start.

For example, if 'RU allocation subfield=224' and 'Additional RU Allocation subfield=10', a case in which RU484, RU242, RU242 is arranged in the order is displayed, but a case where the second RU242 is a multiple combination target with RU484 may be displayed have.

That is, indexes related to multiple RUs may be set in the RU484 and the second RU242 (first, second, and fourth subchannels), and a separate index may be independently set in the first RU242 (third subchannel).

Specifically, 'RU allocation subfield=224' and 'Additional RU Allocation subfield=10' may be configured in the first 20 MHz subchannel where multiple RUs of RU484+RU242 start. In the second subchannel following the first 20MHz subchannel, 'RU allocation subfield=116' and 'Additional RU Allocation subfield=00' are set, and then 'RU allocation subfield=116', 'Additional RU Allocation subfield=00' in the fourth subchannel subfield=00' may be set.

Of course, since the 3rd subchannel between the 2nd and 4th is not a multi-RU target of RU484+RU242, an RU separate from the multi-RU of RU484+RU242 may be independently allocated. For example, in the third subchannel, 'RU allocation subfield=113', 'Additional RU Allocation subfield=00' is set (when STA is not allocated) or 'RU allocation subfield=192', 'Additional RU Allocation subfield= 00' may be configured (when a STA different from the multi-RU of RU484+RU242 is allocated), and other indices may be configured. Meanwhile, in addition to the above method, there may be another method of signaling the multiple RUs of RU484+RU242 or the multiple RUs of RU484+RU996 through 'RU Allocation subfield' + 'Additional RU allocation subfield'.

Specifically, 'RU Allocation subfield' + 'Additional RU allocation subfield' is each 'RU allocation subfield = 113' + 'Additional RU Allocation subfield = 00' or a reserved index indicated as (for example, 'RU') allocation subfield = 113' + 'Additional RU Allocation subfield = 01/10/11') have.

More specifically, if 'RU Allocation subfield' + 'Additional RU allocation subfield' of the current 20MHz subchannel is '113' + '00' or is set to an index corresponding to a reserved, immediately A task of checking whether there is an index of 'RU Allocation subfield' + 'Additional RU Allocation subfield' corresponding to a large-size multi-RU in the 20 MHz sub-channel arranged in front (ie, arranged in a lower band) may be preceded. If the index of 'RU Allocation subfield' + 'Additional RU Allocation subfield' corresponding to a large-size multi-RU is checked, a necessary 20 MHz sub-channel is calculated based on the 20 MHz sub-channel, and based on the calculation result, the current 20 MHz sub It may be determined whether a channel is allocated for multiple RUs of RU484+RU242 or multiple RUs of RU484+RU996.

Of course, in the state that 'RU Allocation subfield' + 'Additional RU allocation subfield' of the current 20MHz subchannel is '113' + '00' or is set to an index corresponding to reserved, immediately before the subchannel If there is no index of 'RU Allocation subfield' + 'Additional RU Allocation subfield' corresponding to a large-size multi-RU in the deployed 20 MHz sub-channel, the RU of the current 20 MHz sub-channel may be an RU to which no STA is allocated.

For example, in the state that 'RU Allocation subfield' + 'Additional RU allocation subfield' of the current 20MHz subchannel is '113' + '00' or is set to an index corresponding to a reserved, If 'RU Allocation subfield' + 'Additional RU Allocation subfield' of the 20 MHz sub-channel placed immediately before is '224' + '10', it can be determined that the current 20 MHz sub-channel is the second sub-channel of RU484 among RU484+RU242. have.

On the other hand, for example, the 'RU Allocation subfield' + 'Additional RU allocation subfield' of the current 20MHz subchannel is '113' + '00' or in the state in which it is set to an index corresponding to a reserved. If 'RU Allocation subfield' + 'Additional RU Allocation subfield' of the 20 MHz sub-channel disposed immediately in front of the sub-channel is '112' + '00', the RU of the current 20 MHz sub-channel is the RU to which no STA is allocated. can

As described above, in the embodiment of the present disclosure, large size multiplexing through 8 bits of the index of the 'RU allocation subfield' and the newly added 2-bit 'Additional RU Allocation subfield', which has conventionally indicated reserved, RU may be defined.

That is, in the embodiment of the present disclosure, all large-size multi-RU combinations shown in FIGS. 21 to 23 are displayed through the reserved value of the 'RU allocation subfield' and the 2-bit 'Additional RU Allocation subfield'. can

As such, in the embodiment of the present disclosure, a method of configuring a signaling field with a large-size multiple RU is implemented in the above-described way. Hereinafter, with reference to FIGS. 27 and 28, a wireless communication method in a WLAN system to explain about it.

27 is a flowchart illustrating a wireless communication method in which a transmitting device allocates an RU to a receiving device in a WLAN system. 28 is a flowchart illustrating a wireless communication method in which a receiving device is allocated an RU from a transmitting device in a WLAN system.

For reference, FIGS. 27 and 28 will be described with reference to FIG. 2 together, and FIGS. 27 and 28 will be sequentially described.

2 and 27, a wireless communication method in which a transmitting device allocates an RU to a receiving device in a WLAN system is illustrated. Accordingly, it is assumed that the wireless communication device 1100 of FIG. 2 is a transmission device (eg, an AP).

First, a PPDU including a preamble and a payload is generated (S100).

Specifically, the transceiver 1140 may generate a PPDU including a preamble and a payload by using the PPDU format and multi-RU allocation information stored in the memory 1120 .

Here, the PPDU may be any one of an HE PPDU and an EHT PPDU. In addition, the preamble may include a plurality of training fields and a plurality of signaling fields, and the payload may include a data field and a packet extension.

And at least one receiving device (eg, any one of HE-SIG-A, HE-SIG-B, U-SIG, and EHT-SIG) in any one of the plurality of signaling fields , RU allocation information for STA) may be included.

Here, the RU allocation information includes a first subfield indicating the arrangement of RUs in the frequency domain corresponding to the PPDU ('RU Allocation subfield' shown in FIGS. 21 to 23 described above) and multiple aggregation target RUs. It may include a second subfield ('Additional RU Allocation subfield' shown in FIGS. 21 to 23 described above).

Of course, the transceiver 1140 configures the signaling field of the preamble according to the signaling field configuration method according to the embodiment of the present disclosure (that is, the signaling field configuration method described above in FIGS. 21 to 26D) to generate a PPDU. .

When the PPDU is generated (S100), the generated PPDU is transmitted to at least one receiving device (S200).

Specifically, the transceiver 1140 may transmit the generated PPDU to at least one external receiving device (eg, an STA) through the antenna arrays 1101 to 1104 .

Accordingly, at least one external receiving device (eg, STA) may use an RU allocated to it based on a PPDU transmitted from each transmitting device (eg, AP).

For reference, a single RU or multiple RUs may be assigned to each of the at least one external receiving device.

Next, referring to FIGS. 2 and 28 , a wireless communication method in which a receiving device is assigned an RU from a transmitting device in a WLAN system is illustrated. Accordingly, it is assumed that the wireless communication device 1100 of FIG. 2 is a receiving device (eg, an STA).

First, a PPDU including a preamble and a payload is received (S300).

Specifically, the transceiver 1140 may receive a PPDU from an external transmission device (eg, an AP) through the antenna arrays 1101 to 1104 .

Here, the PPDU may be any one of an HE PPDU and an EHT PPDU. In addition, the preamble may include a plurality of training fields and a plurality of signaling fields, and the payload may include a data field and a packet extension.

And at least one receiving device (eg, any one of HE-SIG-A, HE-SIG-B, U-SIG, and EHT-SIG) in any one of the plurality of signaling fields , RU allocation information for STA) may be included.

Here, the RU allocation information includes a first subfield indicating the arrangement of RUs in the frequency domain corresponding to the PPDU ('RU Allocation subfield' shown in FIGS. 21 to 23 described above) and multiple aggregation target RUs. It may include a second subfield ('Additional RU Allocation subfield' shown in FIGS. 21 to 23 described above).

Of course, the preamble of the PPDU received by the transceiver 1140 may include a signaling field configured according to the signaling field configuration method according to an embodiment of the present disclosure (that is, the signaling field configuration method described above in FIGS. 21 to 26D). have.

Upon receiving the PPDU (S300), the payload is decoded based on the preamble (S400).

Specifically, the transceiver 1140 may decode the payload based on the preamble of the received PPDU.

Accordingly, the receiving device (eg, the STA) may identify and use the RU allocated to it based on the decoding result.

As described above, the embodiment of the present disclosure can improve spectrum efficiency and data rate in a physical layer by efficiently configuring a PPDU for allocating multiple RUs to a user.

Although the present disclosure has been described with reference to the embodiment shown in the drawings, this is merely exemplary, and 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 (34)

In the transmission device of a wireless local area network (WLAN) system,
A transceiver for generating a Physical Layer Convergence Protocol (PLCP) protocol data unit (PPDU) including a preamble and a payload, and transmitting the generated PPDU to at least one receiving device; and
A main processor for controlling the transceiver,
The preamble includes a plurality of training fields and a plurality of signaling fields,
Any one signaling field among the plurality of signaling fields includes resource unit (RU) allocation information for the at least one receiving device,
The RU allocation information includes a first subfield indicating the arrangement of an RU in a frequency domain corresponding to the PPDU and a second subfield indicating a multiple combining target RU.
sending device.
According to claim 1,
The payload includes a data field,
At least one RU is disposed in the frequency domain of the data field based on the RU allocation information,
The RU is a single RU or 26 of any one of 26-subcarrier RU, 52-subcarrier RU, 106-subcarrier RU, 242-subcarrier RU, 484-subcarrier RU, and 996-subcarrier RU. Any one of +52-subcarrier RU, 52+26-subcarrier RU, 26+106-subcarrier RU, 106+26-subcarrier RU, 484+242-subcarrier RU, and 484+996-subcarrier RU containing multiple RUs of
sending device.
3. The method of claim 2,
When the single RU is any one of the 106-subcarrier RU, 242-subcarrier RU, 484-subcarrier RU, and 996-subcarrier RU, a maximum of 16 receiving devices can be allocated to the single RU;
When the single RU is any one of the 26-subcarrier RU and the 52-subcarrier RU, one receiving device can be assigned to the single RU.
sending device.
3. The method of claim 2,
When the multi-RU is any one of the 26+106-subcarrier RU, 106+26-subcarrier RU, 484+242-subcarrier RU, and 484+996-subcarrier RU, the multi-RU includes a maximum of 16 The receiving device is assignable,
When the multi-RU is one of the 26+52-subcarrier RU and the 52+26-subcarrier RU, one receiving device can be assigned to the multi-RU
sending device.
3. The method of claim 2,
The single RU or the multiple RUs can be assigned to each of the at least one receiving device.
sending device.
3. The method of claim 2,
The first subfield consists of 8 bits, the second subfield consists of 2 bits,
A combination of 8 bits of the first subfield and 2 bits of the second subfield can indicate 16 as the maximum number of receiving devices allocable to the RU.
sending device.
7. The method of claim 6,
When a combination of 8 bits of the first subfield and 2 bits of the second subfield cannot indicate a part of the number of RU allocable cases in a specific index of the first subfield,
A combination of 8 bits of an index indicated as reserved in the first subfield and 2 bits of the second subfield indicates the number of cases that cannot be indicated
sending device.
7. The method of claim 6,
When the number of RU assignment cases that can be indicated by a combination of 8 bits of the first subfield and 2 bits of the second subfield is greater than the number of RU assignment cases at a specific index of the first subfield,
Among the sub-indexes in the specific index, an unnecessary sub-index indicated by 2 bits of the second sub-field is indicated as reserved.
sending device.
3. The method of claim 2,
A 52-subcarrier RU disposed at at least one of both ends of the frequency domain cannot be multi-combined with other RUs.
sending device.
3. The method of claim 2,
Among the single RUs, the 26-subcarrier RU, 52-subcarrier RU, and 106-subcarrier RU are small-size RUs,
Among the single RUs, the 242-subcarrier RU, 484-subcarrier RU, and 996-subcarrier RU are large-size RUs.
sending device.
11. The method of claim 10,
Among the multiple RUs, the 26+52-subcarrier RU, 52+26-subcarrier RU, 26+106-subcarrier RU, and 106+26-subcarrier RU are small size multiple RUs,
Among the multiple RUs, the 484+242-subcarrier RU and 484+996-subcarrier RU are large-size multiple RUs.
sending device.
According to claim 1,
A single RU or multiple RUs can be assigned to each of the at least one receiving device
sending device.
According to claim 1,
The first subfield consists of 8 bits, the second subfield consists of 2 bits,
A combination of 8 bits of the first subfield and 2 bits of the second subfield can indicate 16 as the maximum number of receiving devices allocable to the RU.
sending device.
14. The method of claim 13,
When a combination of 8 bits of the first subfield and 2 bits of the second subfield cannot indicate a part of the number of RU allocable cases in a specific index of the first subfield,
A combination of 8 bits of an index indicated as reserved in the first subfield and 2 bits of the second subfield indicates the number of cases that cannot be indicated
sending device.
14. The method of claim 13,
When the number of RU assignment cases that can be indicated by a combination of 8 bits of the first subfield and 2 bits of the second subfield is greater than the number of RU assignment cases at a specific index of the first subfield,
Among the sub-indexes in the specific index, an unnecessary sub-index indicated by 2 bits of the second sub-field is indicated as reserved.
sending device.
A receiving device for a WLAN system, comprising:
a transceiver for receiving a PPDU including a preamble and a payload from a transmitting device, and decoding the payload based on the preamble; and
A main processor for controlling the transceiver,
The preamble includes a plurality of training fields and a plurality of signaling fields,
Any one of the plurality of signaling fields includes RU allocation information for the receiving device,
The RU allocation information includes a first subfield indicating an arrangement of RUs in a frequency domain corresponding to the PPDU and a second subfield indicating an RU to be combined with multiple
receiving device.
17. The method of claim 16,
The payload includes a data field,
At least one RU is disposed in the frequency domain of the data field based on the RU allocation information,
The RU is a single RU or 26 of any one of 26-subcarrier RU, 52-subcarrier RU, 106-subcarrier RU, 242-subcarrier RU, 484-subcarrier RU, and 996-subcarrier RU. Any one of +52-subcarrier RU, 52+26-subcarrier RU, 26+106-subcarrier RU, 106+26-subcarrier RU, 484+242-subcarrier RU, and 484+996-subcarrier RU containing multiple RUs of
receiving device.
18. The method of claim 17,
When the single RU is any one of the 106-subcarrier RU, 242-subcarrier RU, 484-subcarrier RU, and 996-subcarrier RU, a maximum of 16 receiving devices can be allocated to the single RU;
When the single RU is any one of the 26-subcarrier RU and the 52-subcarrier RU, one receiving device can be assigned to the single RU.
receiving device.
18. The method of claim 17,
When the multi-RU is any one of the 26+106-subcarrier RU, 106+26-subcarrier RU, 484+242-subcarrier RU, and 484+996-subcarrier RU, the multi-RU includes a maximum of 16 The receiving device is assignable,
When the multi-RU is one of the 26+52-subcarrier RU and the 52+26-subcarrier RU, one receiving device can be assigned to the multi-RU
receiving device.
18. The method of claim 17,
The single RU or the multiple RUs can be assigned to the receiving device
receiving device.
18. The method of claim 17,
The first subfield consists of 8 bits, the second subfield consists of 2 bits,
A combination of 8 bits of the first subfield and 2 bits of the second subfield can indicate 16 as the maximum number of receiving devices allocable to the RU.
receiving device.
22. The method of claim 21,
When a combination of 8 bits of the first subfield and 2 bits of the second subfield cannot indicate a part of the number of RU allocable cases in a specific index of the first subfield,
A combination of 8 bits of the index indicated as reserved in the first subfield and 2 bits of the second subfield indicates the number of cases that cannot be indicated
receiving device.
22. The method of claim 21,
When the number of RU assignment cases that can be indicated by a combination of 8 bits of the first subfield and 2 bits of the second subfield is greater than the number of RU assignment cases at a specific index of the first subfield,
Among the sub-indexes in the specific index, an unnecessary sub-index indicated by 2 bits of the second sub-field is indicated as reserved.
receiving device.
18. The method of claim 17,
A 52-subcarrier RU disposed at at least one of both ends of the frequency domain cannot be multi-combined with other RUs.
receiving device.
18. The method of claim 17,
Among the single RUs, the 26-subcarrier RU, 52-subcarrier RU, and 106-subcarrier RU are small-size RUs,
Among the single RUs, the 242-subcarrier RU, 484-subcarrier RU, and 996-subcarrier RU are large-size RUs.
sending device.
26. The method of claim 25,
Among the multiple RUs, the 26+52-subcarrier RU, 52+26-subcarrier RU, 26+106-subcarrier RU, and 106+26-subcarrier RU are small size multiple RUs,
Among the multiple RUs, the 484+242-subcarrier RU and 484+996-subcarrier RU are large-size multiple RUs.
receiving device.
17. The method of claim 16,
A single RU or multiple RUs can be assigned to the receiving device
receiving device.
17. The method of claim 16,
The first subfield consists of 8 bits, the second subfield consists of 2 bits,
A combination of 8 bits of the first subfield and 2 bits of the second subfield can indicate 16 as the maximum number of receiving devices allocable to the RU.
receiving device.
29. The method of claim 28,
When a combination of 8 bits of the first subfield and 2 bits of the second subfield cannot indicate a part of the number of RU allocable cases in a specific index of the first subfield,
A combination of 8 bits of an index indicated as reserved in the first subfield and 2 bits of the second subfield indicates the number of cases that cannot be indicated
receiving device.
29. The method of claim 28,
When the number of RU assignment cases that can be indicated by a combination of 8 bits of the first subfield and 2 bits of the second subfield is greater than the number of RU assignment cases at a specific index of the first subfield,
Among the sub-indexes in the specific index, an unnecessary sub-index indicated by 2 bits of the second sub-field is indicated as reserved.
receiving device.
A wireless communication method in which a transmitting device allocates an RU to at least one receiving device in a WLAN system, the wireless communication method comprising:
generating a PPDU including a preamble and a payload; and
Transmitting the generated PPDU to the at least one receiving device,
The preamble includes a plurality of training fields and a plurality of signaling fields,
Any one of the plurality of signaling fields includes RU allocation information for the at least one receiving device,
The RU allocation information includes a first subfield indicating an arrangement of RUs in a frequency domain corresponding to the PPDU and a second subfield indicating an RU to be combined with multiple
wireless communication method.
A wireless communication method in which a receiving device is assigned an RU from a transmitting device in a WLAN system,
receiving a PPDU including a preamble and a payload; and
Decoding the payload based on the preamble,
The preamble includes a plurality of training fields and a plurality of signaling fields,
Any one of the plurality of signaling fields includes RU allocation information for the receiving device,
The RU allocation information includes a first subfield indicating an arrangement of RUs in a frequency domain corresponding to the PPDU and a second subfield indicating an RU to be combined with multiple
wireless communication method.
When executed by the main processor in the transmitting device of the WLAN system, it causes the transmitting device to:
generating a PPDU including a preamble and a payload; and
Transmitting the generated PPDU to the at least one receiving device,
The preamble includes a plurality of training fields and a plurality of signaling fields,
Any one of the plurality of signaling fields includes RU allocation information for the at least one receiving device,
The RU allocation information includes a first subfield indicating the arrangement of RUs in the frequency domain corresponding to the PPDU and a second subfield indicating a multiple combining target RU. Instruction for performing a wireless communication method to save
A non-transitory computer-readable medium.
When executed by a main processor in a receiving device of a WLAN system, it causes the receiving device to:
receiving a PPDU including a preamble and a payload; and
Decoding the payload based on the preamble,
The preamble includes a plurality of training fields and a plurality of signaling fields,
Any one of the plurality of signaling fields includes RU allocation information for the receiving device,
The RU allocation information stores a command for performing a wireless communication method including a first subfield indicating an arrangement of RUs in a frequency domain corresponding to the PPDU and a second subfield indicating a multiple combining target RU.
Non-transitory computer-readable media.

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