WO2021029560A1

WO2021029560A1 - Method and device for receiving ppdu allocated to multi-ru, for constellation mapped signal in wireless lan system

Info

Publication number: WO2021029560A1
Application number: PCT/KR2020/009688
Authority: WO
Inventors: 박은성; 최진수; 임동국
Original assignee: 엘지전자 주식회사
Priority date: 2019-08-12
Filing date: 2020-07-23
Publication date: 2021-02-18

Abstract

Proposed are a method and device for receiving a PPDU allocated to a multi-RU, for a constellation mapped signal in a wireless LAN system. Particularly, a reception STA receives, from a transmission STA, a PPDU comprising a data field and decodes the data field. The data field is received via a multi-RU which is an aggregate of a first RU and a second RU. A constellation mapped signal is allocated to a data tone of the data field. The data tone comprises a first data tone of the first RU and a second data tone of the second RU. The first c first signals among constellation mapped signals are allocated to c data tones of the first RU, having the lowest frequency. One second signal which comes after the first signals among the constellation mapped signals is allocated to one data tone of the second RU, having the lowest frequency. C is defined as c=floor(a/b).

Description

Method and apparatus for receiving PPDU allocated to MULTI-RU with constellation-mapped signal in wireless LAN system

The present specification relates to a technique for receiving data through a multi-RU in a wireless LAN system, and more particularly, to a method and an apparatus for receiving a PPDU allocated to a multi-RU with a constellation-mapped signal.

WLAN (wireless local area network) has been improved in various ways. For example, the IEEE 802.11ax standard proposes an improved communication environment using OFDMA (orthogonal frequency division multiple access) and DL MU downlink multi-user multiple input, multiple output (MIMO) techniques.

This specification proposes technical features that can be used in a new communication standard. For example, the new communication standard may be an extreme high throughput (EHT) standard that is currently being discussed. The EHT standard may use a newly proposed increased bandwidth, an improved PHY layer protocol data unit (PPDU) structure, an improved sequence, and a hybrid automatic repeat request (HARQ) technique. The EHT standard can be referred to as the IEEE 802.11be standard.

In the new wireless LAN standard, an increased number of spatial streams can be used. In this case, in order to properly use the increased number of spatial streams, a signaling technique in the WLAN system may need to be improved.

The present specification proposes a method and apparatus for receiving a PPDU allocated to a multi-RU in a constellation-mapped signal in a WLAN system.

An example of the present specification proposes a method of receiving a PPDU allocated to a multi-RU with a constellation-mapped signal.

This embodiment may be performed in a network environment in which a next-generation wireless LAN system (IEEE 802.11be or EHT wireless LAN system) is supported. The next-generation wireless LAN system is a wireless LAN system that is an improved 802.11ax system and may satisfy backward compatibility with the 802.11ax system.

This embodiment proposes a method of allocating a constellation-mapped signal to the Multi-RU by allocating a multi-RU supported by the 802.11be WLAN system to one STA to transmit a PPDU. The Multi-RU refers to an RU in which several consecutive or discontinuous RUs are aggregated.

The transmitting STA (station) generates a Physical Protocol Data Unit (PPDU) including a data field.

The transmitting STA transmits the PPDU to the receiving STA.

The data field is received through a multiple-resource unit (RU) in which a first resource unit (RU) and a second RU are aggregated.

A constellation mapped signal is allocated to the data tone of the data field. Specifically, the data field may be generated based on a bit stream. The bit stream may correspond to an input bit stream. The constellation-mapped signal may be a modulation symbol obtained by performing constellation mapping on the bit stream. The data field may be generated through the following procedure.

Specifically, 1) PHY padding is performed on the bit stream, 2) scrambling operation is performed, 3) BCC or LDPC encoding is performed, and 4) BCC or LDPC encoding bits are mapped to a specific spatial stream. A stream parsing operation is performed, 5) the constellation mapping is performed for each spatial stream, and 6) a constellation mapped signal parsing that divides the constellation-mapped signal and assigns it to the Multi-RU. signal parsing) operation may be performed. In the transmitting STA, the procedures 1) to 6) may be sequentially operated to generate the data field. In this embodiment, the procedure of 6) will be mainly described.

The data tone includes a first data tone of the first RU and a second data tone of the second RU.

As an example, a method of distributing and allocating a constellation-mapped signal to the Multi-RU by defining a variable c as follows may be described.

The first c first signals among the constellation-mapped signals are allocated to the c data tones having the lowest frequency of the first RU. Among the constellation-mapped signals, one second signal following the first signal is allocated to one data tone having the lowest frequency of the second RU.

C is defined as follows.

c=floor(a/b)

Here, a is the number of the first data tones, b is the number of the second data tones, a is greater than b, and floor is a descending function.

According to the embodiment proposed in the present specification, by distributing and allocating a constellation-mapped signal to a Multi-RU, it is possible to obtain a data tone optimized in terms of frequency diversity, thereby improving the overall throughput.

1 shows an example of a transmitting device and/or a receiving device of the present specification.

2 is a conceptual diagram showing the structure of a wireless LAN (WLAN).

3 is a diagram illustrating a general link setup process.

4 is a diagram showing an example of a PPDU used in the IEEE standard.

5 is a diagram showing an arrangement of resource units (RU) used in a 20 MHz band.

6 is a diagram showing an arrangement of a resource unit (RU) used in a 40 MHz band.

7 is a diagram showing the arrangement of resource units (RU) used in the 80MHz band.

8 shows the structure of the HE-SIG-B field.

9 shows an example in which a plurality of User STAs are allocated to the same RU through the MU-MIMO scheme.

10 shows the operation according to the UL-MU.

11 shows an example of a trigger frame.

12 shows an example of a common information field of a trigger frame.

13 shows an example of a subfield included in a per user information field.

14 describes the technical features of the UORA technique.

15 shows an example of a channel used/supported/defined within a 2.4 GHz band.

16 shows an example of a channel used/supported/defined within a 5 GHz band.

17 shows an example of a channel used/supported/defined within a 6 GHz band.

18 shows an example of a PPDU used in the present specification.

19 shows an example of a PHY transmission procedure for HE SU PPDU.

20 shows an example of a block diagram of a transmitting device generating a data field of an HE PPDU using BCC encoding.

21 shows an example of a block diagram of a transmission device generating a data field of an HE PPDU using LDPC encoding.

22 is a flowchart showing the operation of the transmission apparatus according to the present embodiment.

23 is a flowchart showing the operation of the reception device according to the present embodiment.

24 is a flowchart illustrating a procedure for transmitting a PPDU by a transmitting STA according to the present embodiment.

25 is a flowchart illustrating a procedure for a receiving STA to receive a PPDU according to the present embodiment.

26 shows a modified example of the transmitting device and/or the receiving device of the present specification.

In the present specification, “A or B (A or B)” may mean “only A”, “only B” or “both A and B”. In other words, in the present specification, “A or B (A or B)” may be interpreted as “A and/or B (A and/or B)”. For example, in this specification, “A, B or C (A, B or C)” refers to “only A”, “only B”, “only C” or “A, B and C” in any and all combinations (any It can mean a combination of A, B and C)”.

A forward slash (/) or comma used in the present specification may mean "and/or". For example, “A/B” may mean “and/or B”. Accordingly, “A/B” may mean “only A”, “only B”, or “both A and B”. For example, “A, B, C” may mean “A, B or C”.

In the present specification, "at least one of A and B" may mean "only A", "only B" or "both A and B". In addition, in this specification, the expression “at least one of A or B” or “at least one of A and/or B” means “at least one It can be interpreted the same as "at least one of A and B".

In addition, in the present specification, “at least one of A, B and C” means “only A”, “only B”, “only C” or “A, B and C It can mean any combination of A, B and C”. In addition, "at least one of A, B or C" or "at least one of A, B and/or C" means It can mean “at least one of A, B and C”.

In addition, parentheses used in the present specification may mean "for example". Specifically, when displayed as “control information (EHT-Signal)”, “EHT-Signal” may be proposed as an example of “control information”. In other words, “control information” of the present specification is not limited to “EHT-Signal”, and “EHT-Signal” may be suggested as an example of “control information”. In addition, even when indicated as “control information (ie, EHT-signal)”, “EHT-Signal” may be proposed as an example of “control information”.

In the present specification, technical features that are individually described in one drawing may be implemented individually or at the same time.

The following example of the present specification can be applied to various wireless communication systems. For example, the following example of the present specification may be applied to a wireless local area network (WLAN) system. For example, this specification can be applied to the IEEE 802.11a/g/n/ac standard or the IEEE 802.11ax standard. In addition, this specification can be applied to the newly proposed EHT standard or IEEE 802.11be standard. In addition, an example of the present specification may be applied to the EHT standard or to a new wireless LAN standard that is improved (enhance) IEEE 802.11be. In addition, an example of the present specification may be applied to a mobile communication system. For example, it can be applied to a mobile communication system based on LTE (Long Term Evolution) based on 3rd Generation Partnership Project (3GPP) standard and its evolution. In addition, an example of the present specification may be applied to a communication system of 5G NR standard based on 3GPP standard.

Hereinafter, in order to describe the technical features of the present specification, technical features to which the present specification can be applied will be described.

The example of FIG. 1 may perform various technical features described below. 1 is related to at least one STA (station). For example, the

STAs

110 and 120 of the present specification include a mobile terminal, a wireless device, a wireless transmit/receive unit (WTRU), a user equipment (UE), It may be referred to by various names such as a mobile station (MS), a mobile subscriber unit, or simply a user.

STAs

110 and 120 of the present specification may be referred to by various names such as a network, a base station, a Node-B, an access point (AP), a repeater, a router, and a relay. The

STAs

110 and 120 of the present specification may be referred to by various names such as a receiving device, a transmitting device, a receiving STA, a transmitting STA, a receiving device, and a transmitting device.

For example, the

STAs

110 and 120 may perform an access point (AP) role or a non-AP role. That is, the

STAs

110 and 120 of the present specification may perform AP and/or non-AP functions. In the present specification, the AP may also be indicated as an AP STA.

The

STAs

110 and 120 of the present specification may support various communication standards other than the IEEE 802.11 standard together. For example, communication standards (eg, LTE, LTE-A, 5G NR standards) according to 3GPP standards may be supported. In addition, the STA of the present specification may be implemented with various devices such as a mobile phone, a vehicle, and a personal computer. In addition, the STA of the present specification may support communication for various communication services such as voice call, video call, data communication, and autonomous driving (Self-Driving, Autonomous-Driving).

In the present specification, the

STAs

110 and 120 may include a medium access control (MAC) and a physical layer interface for a wireless medium according to the IEEE 802.11 standard.

The

STAs

110 and 120 will be described on the basis of the sub-drawing (a) of FIG. 1 as follows.

The first STA 110 may include a processor 111, a memory 112, and a transceiver 113. The illustrated processor, memory, and transceiver may each be implemented as separate chips, or at least two or more blocks/functions may be implemented through a single chip.

The transceiver 113 of the first STA performs a signal transmission/reception operation. Specifically, IEEE 802.11 packets (eg, IEEE 802.11a/b/g/n/ac/ax/be, etc.) can be transmitted and received.

For example, the first STA 110 may perform an intended operation of the AP. For example, the processor 111 of the AP may receive a signal through the transceiver 113, process a received signal, generate a transmission signal, and perform control for signal transmission. The memory 112 of the AP may store a signal (ie, a received signal) received through the transceiver 113, and may store a signal (ie, a transmission signal) to be transmitted through the transceiver.

For example, the second STA 120 may perform an intended operation of a non-AP STA. For example, the non-AP transceiver 123 performs a signal transmission/reception operation. Specifically, IEEE 802.11 packets (eg, IEEE 802.11a/b/g/n/ac/ax/be, etc.) can be transmitted and received.

For example, the processor 121 of the non-AP STA may receive a signal through the transceiver 123, process a received signal, generate a transmission signal, and perform control for signal transmission. The memory 122 of the non-AP STA may store a signal (ie, a reception signal) received through the transceiver 123 and may store a signal (ie, a transmission signal) to be transmitted through the transceiver.

For example, in the following specification, an operation of a device indicated as an AP may be performed by the first STA 110 or the second STA 120. For example, when the first STA 110 is an AP, the operation of the device indicated as an AP is controlled by the processor 111 of the first STA 110 and is controlled by the processor 111 of the first STA 110. A related signal may be transmitted or received through the controlled transceiver 113. In addition, control information related to the operation of the AP or a transmission/reception signal of the AP may be stored in the memory 112 of the first STA 110. In addition, when the second STA 110 is an AP, the operation of the device indicated by the AP is controlled by the processor 121 of the second STA 120 and controlled by the processor 121 of the second STA 120. A related signal may be transmitted or received through the transceiver 123 being used. In addition, control information related to the operation of the AP or transmission/reception signals of the AP may be stored in the memory 122 of the second STA 110.

For example, in the following specification, an operation of a device indicated as non-AP (or User-STA) may be performed by the first STA 110 or the second STA 120. For example, when the second STA 120 is a non-AP, the operation of the device marked as non-AP is controlled by the processor 121 of the second STA 120 and the processor of the second STA 120 ( A related signal may be transmitted or received through the transceiver 123 controlled by 121). In addition, control information related to the operation of the non-AP or transmission/reception signals of the AP may be stored in the memory 122 of the second STA 120. For example, when the first STA 110 is a non-AP, the operation of the device indicated as non-AP is controlled by the processor 111 of the first STA 110 and the processor of the first STA 120 ( A related signal may be transmitted or received through the transceiver 113 controlled by 111). In addition, control information related to the operation of the non-AP or transmission/reception signals of the AP may be stored in the memory 112 of the first STA 110.

In the following specification, (transmit/receive) STA, first STA, second STA, STA1, STA2, AP, first AP, second AP, AP1, AP2, (transmit/receive) Terminal, (transmit/receive) device , (Transmission/reception) apparatus, a device called a network, etc. may refer to the

STAs

110 and 120 of FIG. 1. For example, without specific reference numerals (transmission/reception) STA, first STA, second STA, STA1, STA2, AP, first AP, second AP, AP1, AP2, (transmission/reception) Terminal, (transmission Devices displayed as /receive) device, (transmit/receive) apparatus, network, etc. may also mean the

STAs

110 and 120 of FIG. 1. For example, in the following example, an operation in which various STAs transmit and receive signals (eg, PPPDUs) may be performed by the

transceivers

113 and 123 of FIG. 1. In addition, in the following example, an operation in which various STAs generate transmission/reception signals or perform data processing or calculation in advance for transmission/reception signals may be performed by the

processors

111 and 121 of FIG. 1. For example, an example of an operation of generating a transmission/reception signal or performing data processing or calculation in advance for a transmission/reception signal is: 1) Determining bit information of a subfield (SIG, STF, LTF, Data) field included in the PPDU. /Acquisition/configuration/computation/decoding/encoding operations, 2) Time resources or frequency resources (eg, subcarrier resources) used for subfields (SIG, STF, LTF, Data) included in the PPDU, etc. Determination/configuration/retrieve operation, 3) A specific sequence used for the subfields (SIG, STF, LTF, Data) fields included in the PPDU (e.g., pilot sequence, STF/LTF sequence, applied to SIG) An operation of determining/configuring/obtaining an extra sequence), 4) a power control operation and/or a power saving operation applied to the STA, 5) an operation related to determination/acquisition/configuration/calculation/decoding/encoding of an ACK signal, etc. Can include. In addition, in the following example, various information used by various STAs for determination/acquisition/configuration/calculation/decoding/encoding of transmission/reception signals (for example, information related to fields/subfields/control fields/parameters/power, etc.) It may be stored in the

memories

112 and 122 of FIG. 1.

The device/STA of the sub-drawing (a) of FIG. 1 described above may be modified as shown in the sub-drawing (b) of FIG. 1. Hereinafter, the

STAs

110 and 120 of the present specification will be described based on the sub-drawing (b) of FIG. 1.

For example, the

transceivers

113 and 123 illustrated in sub-drawing (b) of FIG. 1 may perform the same functions as the transceiver illustrated in sub-drawing (a) of FIG. 1. For example, the

processing chips

114 and 124 shown in sub-drawing (b) of FIG. 1 may include

processors

111 and 121 and

memories

112 and 122. The

processors

111 and 121 and the

memories

112 and 122 illustrated in sub-drawing (b) of FIG. 1 are the

processors

111 and 121 and the

memories

112 and 122 illustrated in sub-drawing (a) of FIG. ) And can perform the same function.

A mobile terminal, a wireless device, a wireless transmit/receive unit (WTRU), a user equipment (UE), a mobile station (MS), and a mobile device described below. Mobile Subscriber Unit, user, user STA, network, base station, Node-B, AP (Access Point), repeater, router, relay, receiving device, transmitting device, receiving STA, transmitting The STA, the receiving device, the transmitting device, the receiving Apparatus, and/or the transmitting Apparatus means the

STAs

110 and 120 shown in sub-drawings (a)/(b) of FIG. 1, or the sub-drawing of FIG. 1 (b It may mean the

processing chips

114 and 124 shown in ). That is, the technical features of the present specification may be performed on the

STAs

110 and 120 shown in sub-drawings (a)/(b) of FIG. 1, and the processing chip shown in sub-drawing (b) of FIG. 114, 124). For example, the technical feature of the transmitting STA transmitting the control signal is that the control signal generated by the

processors

111 and 121 shown in sub-drawings (a)/(b) of FIG. 1 is sub-drawing (a) of FIG. It can be understood as a technical feature transmitted through the

transceivers

113 and 123 shown in )/(b). Alternatively, the technical feature in which the transmitting STA transmits the control signal is a technical feature in which a control signal to be transmitted to the

transceivers

113 and 123 is generated from the

processing chips

114 and 124 shown in sub-drawing (b) of FIG. 1. Can be understood.

For example, the technical characteristic that the receiving STA receives the control signal may be understood as a technical characteristic in which the control signal is received by the

transceivers

113 and 123 shown in sub-drawing (a) of FIG. 1. Alternatively, the technical feature that the receiving STA receives the control signal is that the control signal received by the

transceivers

113 and 123 shown in sub-drawing (a) of FIG. 1 is the processor shown in sub-drawing (a) of FIG. 111, 121) can be understood as a technical feature obtained. Alternatively, the technical feature that the receiving STA receives the control signal is that the control signal received by the

transceivers

113 and 123 shown in sub-drawing (b) of FIG. 1 is a processing chip shown in sub-drawing (b) of FIG. It can be understood as a technical feature obtained by (114, 124).

Referring to sub-drawing (b) of FIG. 1,

software codes

115 and 125 may be included in the

memories

112 and 122. The

software codes

115 and 125 may include instructions for controlling the operations of the

processors

111 and 121. The

software codes

115 and 125 may be included in various programming languages.

The

processors

111 and 121 or the

processing chips

114 and 124 illustrated in FIG. 1 may include an application-specific integrated circuit (ASIC), another chipset, a logic circuit, and/or a data processing device. The processor may be an application processor (AP). For example, the

processors

111 and 121 or the

processing chips

114 and 124 shown in FIG. 1 are a digital signal processor (DSP), a central processing unit (CPU), a graphics processing unit (GPU), and a modem (modulator). and demodulator). For example, the

processors

111 and 121 or the

processing chips

114 and 124 shown in FIG. 1 are SNAPDRAGONTM series processors manufactured by Qualcomm®, EXYNOSTM series processors manufactured by Samsung®, and It may be an A series processor, a HELIOTM series processor manufactured by MediaTek®, an ATOMTM series processor manufactured by INTEL®, or an enhanced processor thereof.

In the present specification, uplink may mean a link for communication from a non-AP STA to an AP STA, and an uplink PPDU/packet/signal may be transmitted through the uplink. In addition, in this specification, the downlink may mean a link for communication from an AP STA to a non-AP STA, and a downlink PPDU/packet/signal may be transmitted through the downlink.

2 is a conceptual diagram showing the structure of a wireless LAN (WLAN).

The upper part of FIG. 2 shows the structure of an infrastructure BSS (basic service set) of IEEE (institute of electrical and electronic engineers) 802.11.

Referring to the upper part of FIG. 2, the wireless LAN system may include one or more infrastructure BSSs 200 and 205 (hereinafter, BSS). The BSS (200, 205) is a set of APs and STAs such as an access point (AP) 225 and STA1 (Station, 200-1) that can communicate with each other by successfully synchronizing, and does not indicate a specific area. The BSS 205 may include one or more STAs 205-1 and 205-2 that can be coupled to one AP 230.

The BSS may include at least one STA,

APs

225 and 230 providing a distribution service, and a distribution system (DS) 210 connecting a plurality of APs.

The distributed system 210 may implement an extended service set (ESS) 240, which is an extended service set, by connecting

several BSSs

200 and 205. The ESS 240 may be used as a term indicating one network formed by connecting one or several APs through the distributed system 210. APs included in one ESS 240 may have the same service set identification (SSID).

The portal 220 may serve as a bridge for connecting a wireless LAN network (IEEE 802.11) and another network (eg, 802.X).

In the BSS as shown in the upper part of FIG. 2, a network between the

APs

225 and 230 and a network between the

APs

225 and 230 and the STAs 200-1, 205-1 and 205-2 may be implemented. However, it may be possible to perform communication by setting up a network even between STAs without the

APs

225 and 230. A network that performs communication by configuring a network even between STAs without the

APs

225 and 230 is defined as an ad-hoc network or an independent basic service set (IBSS).

The lower part of FIG. 2 is a conceptual diagram showing IBSS.

2, the IBSS is a BSS operating in an ad-hoc mode. Since IBSS does not include APs, there is no centralized management entity. That is, in the IBSS, the STAs 250-1, 250-2, 250-3, 255-4, and 255-5 are managed in a distributed manner. In IBSS, all STAs (250-1, 250-2, 250-3, 255-4, 255-5) can be configured as mobile STAs, and access to the distributed system is not allowed, so a self-contained network. network).

3 is a diagram illustrating a general link setup process.

In the illustrated step S310, the STA may perform a network discovery operation. The network discovery operation may include a scanning operation of the STA. That is, in order for the STA to access the network, it must find a network that can participate. The STA must identify a compatible network before participating in the wireless network. The process of identifying a network existing in a specific area is called scanning. Scanning methods include active scanning and passive scanning.

3 illustrates an example of a network discovery operation including an active scanning process. In active scanning, the STA performing scanning transmits a probe request frame to search for an AP present in the vicinity while moving channels and waits for a response thereto. The responder transmits a probe response frame in response to the probe request frame to the STA that has transmitted the probe request frame. Here, the responder may be an STA that last transmitted a beacon frame in the BSS of the channel being scanned. In BSS, since the AP transmits a beacon frame, the AP becomes a responder, and in IBSS, because STAs in the IBSS rotate and transmit beacon frames, the responder is not constant. For example, an STA that transmits a probe request frame on channel 1 and receives a probe response frame on channel 1 stores BSS-related information included in the received probe response frame and stores the next channel (e.g., 2 Channel) and scanning (that is, probe request/response transmission/reception on channel 2) in the same manner.

Although not shown in the example of FIG. 3, the scanning operation may be performed in a passive scanning method. An STA performing scanning based on passive scanning may wait for a beacon frame while moving channels. The beacon frame is one of the management frames in IEEE 802.11, and is periodically transmitted so that an STA that notifies the existence of a wireless network and performs scanning can find a wireless network and participate in the wireless network. In the BSS, the AP performs a role of periodically transmitting a beacon frame, and in IBSS, the STAs in the IBSS rotate and transmit the beacon frame. When the STA performing the scanning receives the beacon frame, it stores information on the BSS included in the beacon frame, moves to another channel, and records the beacon frame information in each channel. The STA receiving the beacon frame may store BSS-related information included in the received beacon frame, move to the next channel, and perform scanning in the next channel in the same manner.

The STA that discovers the network may perform an authentication process through step S320. This authentication process may be referred to as a first authentication process in order to clearly distinguish it from the security setup operation of step S340 to be described later. The authentication process of S320 may include a process in which the STA transmits an authentication request frame to the AP, and in response thereto, the AP transmits an authentication response frame to the STA. An authentication frame used for authentication request/response corresponds to a management frame.

The authentication frame consists of an authentication algorithm number, an authentication transaction sequence number, a status code, a challenge text, a robust security network (RSN), and a finite cycle group. Group), etc. can be included.

The STA may transmit an authentication request frame to the AP. The AP may determine whether to allow authentication for the corresponding STA based on the information included in the received authentication request frame. The AP may provide the result of the authentication process to the STA through the authentication response frame.

The STA that has been successfully authenticated may perform a connection process based on step S330. The association process includes a process in which the STA transmits an association request frame to the AP, and in response thereto, the AP transmits an association response frame to the STA. For example, the connection request frame includes information related to various capabilities, beacon listening intervals, service set identifiers (SSIDs), supported rates, supported channels, RSNs, and mobility domains. , Supported operating classes, TIM broadcast request, interworking service capability, and the like may be included. For example, the connection response frame includes information related to various capabilities, status codes, association IDs (AIDs), support rates, Enhanced Distributed Channel Access (EDCA) parameter sets, Received Channel Power Indicators (RCPI), Received Signal to Noise (RSNI). Indicator), mobility domain, timeout interval (association comeback time), overlapping BSS scan parameter, TIM broadcast response, QoS map, etc. may be included.

Thereafter, in step S340, the STA may perform a security setup process. The security setup process of step S340 may include, for example, a process of performing a private key setup through 4-way handshaking through an Extensible Authentication Protocol over LAN (EAPOL) frame. .

4 is a diagram showing an example of a PPDU used in the IEEE standard.

As shown, in standards such as IEEE a/g/n/ac, various types of PHY protocol data units (PPDUs) were used. Specifically, the LTF and STF fields included training signals, SIG-A and SIG-B included control information for the receiving station, and the data field included user data corresponding to PSDU (MAC PDU/Aggregated MAC PDU). Included.

In addition, FIG. 4 also includes an example of an HE PPDU of the IEEE 802.11ax standard. The HE PPDU according to FIG. 4 is an example of a PPDU for multiple users, and HE-SIG-B is included only for multiple users, and the corresponding HE-SIG-B may be omitted in the PPDU for a single user.

As shown, the HE-PPDU for multiple users (MU) is L-STF (legacy-short training field), L-LTF (legacy-long training field), L-SIG (legacy-signal), HE-SIG-A (high efficiency-signal A), HE-SIG-B (high efficiency-signal-B), HE-STF (high efficiency-short training field), HE-LTF (high efficiency-long training field) , A data field (or MAC payload), and a packet extension (PE) field. Each field may be transmitted during the illustrated time period (ie, 4 or 8 μs, etc.).

Hereinafter, a resource unit (RU) used in the PPDU will be described. The resource unit may include a plurality of subcarriers (or tones). The resource unit may be used when transmitting signals to multiple STAs based on the OFDMA technique. Also, even when a signal is transmitted to one STA, a resource unit may be defined. The resource unit can be used for STF, LTF, data fields, and the like.

As shown in FIG. 5, resource units (RUs) corresponding to different numbers of tones (ie, subcarriers) may be used to configure some fields of the HE-PPDU. For example, resources may be allocated in units of RU shown for HE-STF, HE-LTF, and data fields.

As shown at the top of Fig. 5, 26-units (ie, units corresponding to 26 tones) may be arranged. In the leftmost band of the 20MHz band, 6 tones may be used as a guard band, and in the rightmost band of the 20MHz band, 5 tones may be used as the guard band. In addition, 7 DC tones are inserted in the center band, that is, the DC band, and 26-units corresponding to 13 tones may exist on the left and right sides of the DC band. In addition, 26-units, 52-units, and 106-units may be allocated to other bands. Each unit can be assigned for a receiving station, i.e. a user.

Meanwhile, the RU arrangement of FIG. 5 is utilized not only in a situation for a plurality of users (MU), but also in a situation for a single user (SU). In this case, as shown in the bottom of FIG. 5, one 242-unit is used. It is possible to use and in this case 3 DC tones can be inserted.

In the example of FIG. 5, RUs of various sizes, that is, 26-RU, 52-RU, 106-RU, 242-RU, etc., have been proposed. Since the specific size of these RUs can be expanded or increased, this embodiment Is not limited to the specific size of each RU (ie, the number of corresponding tones).

Similar to the use of RUs of various sizes in the example of FIG. 5, 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, and the like may be used in the example of FIG. 6. In addition, 5 DC tones can be inserted into the center frequency, 12 tones are used as guard bands in the leftmost band of the 40MHz band, and 11 tones are used in the rightmost band of the 40MHz band. It can be used as a guard band.

Also, as shown, when used for a single user, a 484-RU may be used. Meanwhile, the fact that the specific number of RUs can be changed is the same as the example of FIG. 4.

Similar to the use of RUs of various sizes in the examples of FIGS. 5 and 6, the example of FIG. 7 may also be used with 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, 996-RU, etc. have. In addition, 7 DC tones can be inserted into the center frequency, 12 tones are used as guard bands 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, a 26-RU using 13 tones located on the left and right of the DC band can be used.

In addition, as shown, when used for a single user, a 996-RU may be used, and in this case, five DC tones may be inserted.

The RU described herein may be used for UL (Uplink) communication and DL (Downlink) communication. For example, when UL-MU communication solicited by the trigger frame is performed, the transmitting STA (eg, AP) transmits the first RU (eg, 26/52/106) to the first STA through the trigger frame. /242-RU, etc.), and a second RU (eg, 26/52/106/242-RU, etc.) may be allocated to the second STA. Thereafter, the first STA may transmit a first Trigger-based PPDU based on the first RU, and the second STA may transmit a second Trigger-based PPDU based on the second RU. The first/second Trigger-based PPDU is transmitted to the AP in the same time interval.

For example, when a DL MU PPDU is configured, the transmitting STA (eg, AP) allocates a first RU (eg, 26/52/106/242-RU, etc.) to the first STA, and 2 STAs may be assigned a second RU (eg, 26/52/106/242-RU, etc.). That is, the transmitting STA (eg, AP) may transmit the HE-STF, HE-LTF, and Data fields for the first STA through the first RU within one MU PPDU, and the second RU through the second RU. HE-STF, HE-LTF, and Data fields for 2 STAs can be transmitted.

Information on the arrangement of the RU may be signaled through HE-SIG-B.

8 shows the structure of the HE-SIG-B field.

As shown, the HE-SIG-B field 810 includes a common field 820 and a user-specific field 830. The common field 820 may include information commonly applied to all users (ie, user STAs) receiving the SIG-B. The user-individual field 830 may be referred to as a user-individual control field. When the SIG-B is transmitted to a plurality of users, the user-individual field 830 may be applied to only some of the plurality of users.

As shown in FIG. 8, the common field 820 and the user-individual field 830 may be encoded separately.

The common field 820 may include N*8 bits of RU allocation information. For example, the RU allocation information may include information on the location of the RU. For example, when a 20 MHz channel is used as shown in FIG. 5, the RU allocation information may include information on which RU (26-RU/52-RU/106-RU) is allocated in which frequency band. .

An example of a case in which RU allocation information is composed of 8 bits is as follows.

As in the example of FIG. 5, a maximum of 9 26-RUs may be allocated to a 20 MHz channel. As shown in Table 1, when the RU allocation information of the common field 820 is set as '00000000', nine 26-RUs may be allocated to a corresponding channel (ie, 20 MHz). In addition, as shown in Table 1, when the RU allocation information of the common field 820 is set as '00000001', seven 26-RUs and one 52-RU are arranged in a corresponding channel. That is, in the example of FIG. 5, 52-RUs may be allocated to the rightmost side and seven 26-RUs may be allocated to the left side.

An example of Table 1 shows only some of the RU locations that can be displayed by RU allocation information.

For example, the RU allocation information may additionally include an example of Table 2 below.

"01000y2y1y0" relates to an example in which 106-RU is allocated to the leftmost-left side of a 20 MHz channel, and five 26-RUs are allocated to the right side. In this case, a plurality of STAs (eg, User-STAs) may be allocated to the 106-RU based on the MU-MIMO technique. Specifically, up to 8 STAs (eg, User-STA) may be allocated to 106-RU, and the number of STAs (eg, User-STA) allocated to 106-RU is 3-bit information (y2y1y0). ). For example, when 3-bit information (y2y1y0) is set to N, the number of STAs (eg, User-STAs) allocated to 106-RU based on the MU-MIMO technique may be N+1.

In general, a plurality of different STAs (eg, user STAs) may be allocated to a plurality of RUs. However, for one RU of a specific size (eg, 106 subcarriers) or more, a plurality of STAs (eg, user STAs) may be allocated based on the MU-MIMO technique.

As shown in FIG. 8, the user-individual field 830 may include a plurality of user fields. As described above, the number of STAs (eg, user STAs) allocated to a specific channel may be determined based on the RU allocation information in the common field 820. For example, when the RU allocation information of the common field 820 is '00000000', one User STA may be allocated to each of nine 26-RUs (ie, a total of 9 User STAs are allocated). That is, up to 9 User STAs may be allocated to a specific channel through the OFDMA scheme. In other words, up to 9 User STAs may be allocated to a specific channel through a non-MU-MIMO scheme.

For example, when RU allocation is set to “01000y2y1y0”, a plurality of User STAs are allocated to 106-RUs disposed on the leftmost-left through the MU-MIMO scheme, and five 26-RUs disposed on the right side are allocated Five User STAs may be allocated through a non-MU-MIMO scheme. This case is embodied through the example of FIG.

For example, when RU allocation is set to “01000010” as shown in FIG. 9, based on Table 2, 106-RUs are allocated to the leftmost-left side of a specific channel, and five 26-RUs are allocated to the right side. I can. In addition, a total of three User STAs may be allocated to the 106-RU through the MU-MIMO scheme. As a result, since a total of 8 User STAs are allocated, the user-individual field 830 of HE-SIG-B may include 8 User fields.

Eight User fields may be included in the order shown in FIG. 9. In addition, as shown in FIG. 8, two User fields may be implemented as one User block field.

The User field shown in FIGS. 8 and 9 may be configured based on two formats. That is, a User field related to the MU-MIMO technique may be configured in a first format, and a User field related to the non-MU-MIMO technique may be configured in a second format. Referring to the example of FIG. 9, User fields 1 to 3 may be based on a first format, and User fields 4 to 8 may be based on a second format. The first format or the second format may include bit information of the same length (eg, 21 bits).

Each User field may have the same size (eg, 21 bits). For example, the User Field of the first format (the format of the MU-MIMO scheme) may be configured as follows.

For example, the first bit (eg, B0-B10) in the user field (ie, 21 bits) is the identification information of the user STA to which the corresponding user field is allocated (eg, STA-ID, partial AID, etc.) It may include. In addition, the second bit (eg, B11-B14) in the user field (ie, 21 bits) may include information on spatial configuration. Specifically, an example of the second bit (ie, B11-B14) may be as shown in Tables 3 to 4 below.

As shown in Table 3 and/or Table 4, the second bit (i.e., B11-B14) may include information on the number of Spatial Streams allocated to a plurality of User STAs allocated according to the MU-MIMO scheme. have. For example, when three User STAs are allocated to 106-RU based on the MU-MIMO scheme as shown in FIG. 9, N_user is set to “3”, and accordingly, as shown in Table 3, N_STS[1], Values of N_STS[2] and N_STS[3] may be determined. For example, when the value of the second bits B11-B14 is “0011”, it may be set to N_STS[1]=4, N_STS[2]=1, and N_STS[3]=1. That is, in the example of FIG. 9, 4 Spatial Streams may be allocated to

User field

1, 1 Spatial Stream may be allocated to

User field

2, and 1 Spatial Stream may be allocated to User field 3.

As in the example of Table 3 and/or Table 4, information on the number of spatial streams for a user STA (that is, the second bit, B11-B14) may consist of 4 bits. In addition, information on the number of spatial streams for a user STA (ie, second bits, B11-B14) may support up to eight spatial streams. In addition, information on the number of spatial streams (ie, second bits, B11-B14) may support up to 4 spatial streams for one user STA.

In addition, the third bit (ie, B15-18) in the user field (ie, 21 bits) may include MCS (Modulation and coding scheme) information. MCS information may be applied to a data field in a PPDU in which the corresponding SIG-B is included.

MCS, MCS information, MCS index, MCS field, and the like used in the present specification may be indicated by a specific index value. For example, MCS information may be indicated by index 0 to index 11. The MCS information includes information on a constellation modulation type (e.g., BPSK, QPSK, 16-QAM, 64-QAM, 256-QAM, 1024-QAM, etc.), and a coding rate (e.g., 1/2, 2/ 3, 3/4, 5/6, etc.). Information on the channel coding type (eg, BCC or LDPC) may be excluded from the MCS information.

In addition, the fourth bit (ie, B19) in the user field (ie, 21 bits) may be a reserved field.

In addition, the fifth bit (ie, B20) in the user field (ie, 21 bits) may include information on the coding type (eg, BCC or LDPC). That is, the fifth bit (ie, B20) may include information on the type of channel coding (eg, BCC or LDPC) applied to the data field in the PPDU including the corresponding SIG-B.

The above-described example relates to the User Field of the first format (the format of the MU-MIMO scheme). An example of the User field of the second format (non-MU-MIMO format) is as follows.

The first bit (eg, B0-B10) in the User field of the second format may include identification information of the User STA. In addition, the second bit (eg, B11-B13) in the user field of the second format may include information on the number of spatial streams applied to the corresponding RU. In addition, the third bit (eg, B14) in the user field of the second format may include information on whether the beamforming steering matrix is applied. The fourth bit (eg, B15-B18) in the User field of the second format may include MCS (Modulation and Coding Scheme) information. In addition, the fifth bit (eg, B19) in the User field of the second format may include information on whether or not Dual Carrier Modulation (DCM) is applied. In addition, the sixth bit (ie, B20) in the user field of the second format may include information on the coding type (eg, BCC or LDPC).

10 shows the operation according to the UL-MU. As shown, a transmitting STA (eg, an AP) may perform channel access through contending (ie, a backoff operation) and transmit a trigger frame 1030. That is, the transmitting STA (eg, AP) may transmit a PPDU including the trigger frame 1330. When a PPDU including a trigger frame is received, a trigger-based (TB) PPDU is transmitted after a delay equal to SIFS.

The

TB PPDUs

1041 and 1042 may be transmitted at the same time slot and may be transmitted from a plurality of STAs (eg, User STAs) in which an AID is indicated in the trigger frame 1030. The ACK frame 1050 for the TB PPDU may be implemented in various forms.

Specific characteristics of the trigger frame will be described with reference to FIGS. 11 to 13. Even when UL-MU communication is used, an orthogonal frequency division multiple access (OFDMA) technique or an MU MIMO technique can be used, and an OFDMA and MU MIMO technique can be used simultaneously.

11 shows an example of a trigger frame. The trigger frame of FIG. 11 allocates resources for uplink multiple-user transmission (MU), and may be transmitted from an AP, for example. The trigger frame may be composed of a MAC frame and may be included in a PPDU.

Each of the fields shown in FIG. 11 may be partially omitted, and other fields may be added. Also, the length of each field may be changed differently from that shown.

The frame control field 1110 of FIG. 11 includes information on the version of the MAC protocol and other additional control information, and the duration field 1120 includes time information for setting NAV or an identifier of the STA (for example, For example, information on AID) may be included.

In addition, the RA field 1130 includes address information of the receiving STA of the corresponding trigger frame, and may be omitted if necessary. The TA field 1140 includes address information of an STA (eg, an AP) that transmits a corresponding trigger frame, and a common information field 1150 is a common information applied to a receiving STA receiving a corresponding trigger frame. Contains control information. For example, a field indicating the length of an L-SIG field of an uplink PPDU transmitted in response to a corresponding trigger frame, or a SIG-A field of an uplink PPDU transmitted in response to a corresponding trigger frame (i.e., HE-SIG-A Field) may contain information that controls the content. In addition, as common control information, information about a length of a CP of an uplink PPDU transmitted in response to a corresponding trigger frame or information about a length of an LTF field may be included.

In addition, it is preferable to include individual user information fields 1160#1 to 1160#N corresponding to the number of receiving STAs receiving the trigger frame of FIG. 11. The individual user information field may be referred to as an “allocation field”.

In addition, the trigger frame of FIG. 11 may include a padding field 1170 and a frame check sequence field 1180.

Each of the individual user information fields 1160#1 to 1160#N shown in FIG. 11 may again include a plurality of subfields.

12 shows an example of a common information field of a trigger frame. Some of the subfields of FIG. 12 may be omitted, and other subfields may be added. In addition, the length of each of the illustrated subfields may be changed.

The illustrated length field 1210 has the same value as the length field of the L-SIG field of the uplink PPDU transmitted in response to the corresponding trigger frame, and the length field of the L-SIG field of the uplink PPDU represents the length of the uplink PPDU. As a result, the length field 1210 of the trigger frame may be used to indicate the length of the corresponding uplink PPDU.

Also, the cascade indicator field 1220 indicates whether a cascade operation is performed. The cascade operation means that downlink MU transmission and uplink MU transmission are performed together in the same TXOP. That is, after downlink MU transmission is performed, it means that uplink MU transmission is performed after a preset time (eg, SIFS). During a casecade operation, there may be only one transmission device (eg, AP) performing downlink communication, and a plurality of transmission devices (eg, non-AP) performing uplink communication may exist.

The CS request field 1230 indicates whether to consider the state of the radio medium or the NAV in a situation in which the receiving device receiving the corresponding trigger frame transmits the corresponding uplink PPDU.

The HE-SIG-A information field 1240 may include information for controlling the content of the SIG-A field (ie, the HE-SIG-A field) of the uplink PPDU transmitted in response to the corresponding trigger frame.

The CP and LTF type field 1250 may include information on the length of the LTF and the CP length of the uplink PPDU transmitted in response to the corresponding trigger frame. The trigger type field 1060 may indicate a purpose for which the corresponding trigger frame is used, for example, normal triggering, triggering for beamforming, and request for Block ACK/NACK.

In this specification, it may be assumed that the trigger type field 1260 of the trigger frame indicates a basic type of trigger frame for normal triggering. For example, a basic type trigger frame may be referred to as a basic trigger frame.

13 shows an example of a subfield included in a per user information field. The user information field 1300 of FIG. 13 may be understood as any of the individual user information fields 1160#1 to 1160#N mentioned in FIG. 11 above. Some of the subfields included in the user information field 1300 of FIG. 13 may be omitted, and other subfields may be added. In addition, the length of each of the illustrated subfields may be changed.

A user identifier field 1310 of FIG. 13 indicates an identifier of an STA (ie, a receiving STA) corresponding to per user information, and an example of the identifier is an association identifier (AID) of the receiving STA. It can be all or part of the value.

In addition, an RU Allocation field 1320 may be included. That is, when the receiving STA identified by the user identifier field 1310 transmits the TB PPDU corresponding to the trigger frame, it transmits the TB PPDU through the RU indicated by the RU allocation field 1320. In this case, the RU indicated by the RU Allocation field 1320 may be the RU shown in FIGS. 5, 6, and 7.

The subfield of FIG. 13 may include a coding type field 1330. The coding type field 1330 may indicate the coding type of the TB PPDU. For example, when BCC coding is applied to the TB PPDU, the coding type field 1330 may be set to '1', and when LDPC coding is applied, the coding type field 1330 may be set to '0'. have.

In addition, the subfield of FIG. 13 may include an MCS field 1340. The MCS field 1340 may indicate an MCS scheme applied to a TB PPDU. For example, when BCC coding is applied to the TB PPDU, the coding type field 1330 may be set to '1', and when LDPC coding is applied, the coding type field 1330 may be set to '0'. have.

Hereinafter, a UL OFDMA-based Random Access (UORA) technique will be described.

14 describes the technical features of the UORA technique.

The transmitting STA (eg, AP) may allocate 6 RU resources as shown in FIG. 14 through a trigger frame. Specifically, the AP is a first RU resource (AID 0, RU 1), a second RU resource (AID 0, RU 2), a third RU resource (AID 0, RU 3), a fourth RU resource (AID 2045, RU 4), a fifth RU resource (AID 2045, RU 5), and a sixth RU resource (AID 3, RU 6) may be allocated. Information on AID 0, AID 3, or AID 2045 may be included, for example, in the user identification field 1310 of FIG. 13. Information about RU 1 to RU 6 may be included in, for example, the RU allocation field 1320 of FIG. 13. AID=0 may mean a UORA resource for an associated STA, and AID=2045 may mean a UORA resource for an un-associated STA. Accordingly, the first to third RU resources of FIG. 14 may be used as UORA resources for an associated STA, and the fourth to fifth RU resources of FIG. 14 are for un-associated STAs. It may be used as a UORA resource, and the sixth RU resource of FIG. 14 may be used as a resource for a normal UL MU.

In the example of FIG. 14, the OBO (OFDMA random access BackOff) counter of STA1 is reduced to 0, and STA1 randomly selects the second RU resources (AID 0, RU 2). In addition, since the OBO counter of STA2/3 is greater than 0, uplink resources are not allocated to STA2/3. In addition, since STA4 in FIG. 14 includes its AID (ie, AID=3) in the trigger frame, resources of RU 6 are allocated without backoff.

Specifically, since STA1 of FIG. 14 is an associated STA, there are a total of three eligible RA RUs for STA1 (RU 1, RU 2, RU 3), and accordingly, STA1 decreases the OBO counter by 3 so that the OBO counter is It became 0. In addition, since STA2 of FIG. 14 is an associated STA, there are a total of three eligible RA RUs for STA2 (RU 1, RU 2, and RU 3). Accordingly, STA2 has reduced the OBO counter by 3, but the OBO counter is 0. Is in a larger state. In addition, since STA3 of FIG. 14 is an un-associated STA, there are a total of two eligible RA RUs (RU 4 and RU 5) for STA3, and accordingly, STA3 has reduced the OBO counter by 2, but the OBO counter is It is in a state greater than 0.

15 shows an example of a channel used/supported/defined within a 2.4 GHz band.

The 2.4 GHz band may be referred to by other names such as the first band (band). In addition, the 2.4 GHz band may refer to a frequency region in which channels having a center frequency adjacent to 2.4 GHz (eg, channels having a center frequency located within 2.4 to 2.5 GHz) are used/supported/defined.

The 2.4 GHz band may contain multiple 20 MHz channels. 20 MHz in the 2.4 GHz band may have multiple channel indexes (eg, index 1 to index 14). For example, a center frequency of a 20 MHz channel to which channel index 1 is assigned may be 2.412 GHz, a center frequency of a 20 MHz channel to which channel index 2 is assigned may be 2.417 GHz, and 20 MHz to which channel index N is assigned The center frequency of the channel may be (2.407 + 0.005*N) GHz. The channel index may be referred to by various names such as channel number. Specific values of the channel index and the center frequency may be changed.

15 exemplarily shows four channels in a 2.4 GHz band. Each of the illustrated first to fourth frequency regions 1510 to 1540 may include one channel. For example, the first frequency domain 1510 may include channel 1 (a 20 MHz channel having index 1). At this time, the center frequency of channel 1 may be set to 2412 MHz. The second frequency domain 1520 may include channel 6. At this time, the center frequency of channel 6 may be set to 2437 MHz. The third frequency domain 1530 may include channel 11. At this time, the center frequency of channel 11 may be set to 2462 MHz. The fourth frequency domain 1540 may include channel 14. At this time, the center frequency of channel 14 may be set to 2484 MHz.

16 shows an example of a channel used/supported/defined within a 5 GHz band.

The 5 GHz band may be referred to by another name such as the second band/band. The 5 GHz band may mean a frequency range in which channels having a center frequency of 5 GHz or more and less than 6 GHz (or less than 5.9 GHz) are used/supported/defined. Alternatively, the 5 GHz band may include a plurality of channels between 4.5 GHz and 5.5 GHz. The specific values shown in FIG. 16 may be changed.

The plurality of channels in the 5 GHz band include UNII (Unlicensed National Information Infrastructure)-1, UNII-2, UNII-3, and ISM. UNII-1 can be called UNII Low. UNII-2 may include a frequency domain called UNII Mid and UNII-2 Extended. UNII-3 can be called UNII-Upper.

A plurality of channels may be set within the 5 GHz band, and the bandwidth of each channel may be variously set to 20 MHz, 40 MHz, 80 MHz, or 160 MHz. For example, a frequency range/range of 5170 MHz to 5330 MHz in UNII-1 and UNII-2 may be divided into eight 20 MHz channels. The frequency range/range from 5170 MHz to 5330 MHz can be divided into four channels through the 40 MHz frequency domain. The 5170 MHz to 5330 MHz frequency domain/range can be divided into two channels through the 80 MHz frequency domain. Alternatively, the 5170 MHz to 5330 MHz frequency domain/range may be divided into one channel through the 160 MHz frequency domain.

17 shows an example of a channel used/supported/defined within a 6 GHz band.

The 6 GHz band may be referred to as a third band/band. The 6 GHz band may mean a frequency region in which channels with a center frequency of 5.9 GHz or more are used/supported/defined. The specific values shown in FIG. 17 may be changed.

For example, the 20 MHz channel of FIG. 17 may be defined from 5.940 GHz. Specifically, the leftmost channel of the 20 MHz channel of FIG. 17 may have an index number 1 (or a channel index, a channel number, etc.), and a center frequency of 5.945 GHz may be allocated. That is, the center frequency of the index N channel may be determined as (5.940 + 0.005*N) GHz.

Accordingly, the index (or channel number) of the 20 MHz channel of FIG. 17 is 1, 5, 9, 13, 17, 21, 25, 29, 33, 37, 41, 45, 49, 53, 57, 61, 65, 69, 73, 77, 81, 85, 89, 93, 97, 101, 105, 109, 113, 117, 121, 125, 129, 133, 137, 141, 145, 149, 153, 157, 161, It may be 165, 169, 173, 177, 181, 185, 189, 193, 197, 201, 205, 209, 213, 217, 221, 225, 229, 233. In addition, according to the above-described (5.940 + 0.005*N) GHz rule, the index of the 40 MHz channel in FIG. 17 is 3, 11, 19, 27, 35, 43, 51, 59, 67, 75, 83, 91, 99, 107, 115, 123, 131, 139, 147, 155, 163, 171, 179, 187, 195, 203, 211, 219, 227.

In the example of FIG. 17, 20, 40, 80, and 160 MHz channels are shown, but additionally, a 240 MHz channel or a 320 MHz channel may be added.

Hereinafter, the PPDU transmitted/received by the STA of the present specification will be described.

18 shows an example of a PPDU used in the present specification.

The PPDU of FIG. 18 may be referred to as various names such as EHT PPDU, transmission PPDU, reception PPDU, 1st type or Nth type PPDU. For example, in this specification, the PPDU or EHT PPDU may be referred to as various names such as a transmission PPDU, a reception PPDU, a first type or an N type PPDU. In addition, the EHT PPU can be used in the EHT system and/or in a new wireless LAN system with an improved EHT system.

The PPDU of FIG. 18 may represent some or all of the PPDU types used in the EHT system. For example, the example of FIG. 18 may be used for both a single-user (SU) mode and a multi-user (MU) mode, only the SU mode, or only the MU mode. For example, in the EHT system, a trigger-based PPDU (TB) may be defined separately or may be configured based on the example of FIG. 18. The trigger frame described through at least one of FIGS. 10 to 14 and the UL-MU operation initiated by the trigger frame (eg, transmission operation of a TB PPDU) may be applied to the EHT system as it is.

In FIG. 18, L-STF to EHT-LTF may be referred to as a preamble or a physical preamble, and may be generated/transmitted/received/acquired/decoded in the physical layer.

The subcarrier spacing of the L-STF, L-LTF, L-SIG, RL-SIG, U-SIG, and EHT-SIG fields of FIG. 18 is set to 312.5 kHz, and the subcarrier spacing of the EHT-STF, EHT-LTF, and Data fields Can be set to 78.125 kHz. That is, the tone index (or subcarrier index) of the L-STF, L-LTF, L-SIG, RL-SIG, U-SIG, and EHT-SIG fields is displayed in units of 312.5 kHz, EHT-STF, EHT-LTF, The tone index (or subcarrier index) of the data field may be displayed in units of 78.125 kHz.

In the PPDU of FIG. 18, the L-LTF and the L-STF may be the same as the conventional field.

The L-SIG field of FIG. 18 may include, for example, 24-bit bit information. For example, the 24-bit information may include a 4 bit Rate field, 1 bit Reserved bit, 12 bit Length field, 1 bit Parity bit, and 6 bit Tail bit. For example, the 12-bit Length field may include information on the length or time duration of the PPDU. For example, the value of the 12-bit Length field may be determined based on the type of PPDU. For example, when the PPDU is a non-HT, HT, VHT PPDU or EHT PPDU, the value of the Length field may be determined as a multiple of 3. For example, when the PPDU is an HE PPDU, a value of the Length field may be determined as "multiple of 3 + 1" or "multiple of 3 +2". In other words, for non-HT, HT, VHT PPDU or EHT PPDU, the value of the Length field may be determined as a multiple of 3, and for HE PPDU, the value of the Length field is "multiple of 3 + 1" or "multiple of 3" It can be determined as +2”.

For example, the transmitting STA may apply BCC encoding based on a code rate of 1/2 to 24-bit information of the L-SIG field. Thereafter, the transmitting STA may obtain a 48-bit BCC coded bit. BPSK modulation is applied to the 48-bit coded bits, so that 48 BPSK symbols may be generated. The transmitting STA may map 48 BPSK symbols to locations excluding pilot subcarriers {subcarrier index -21, -7, +7, +21} and DC subcarrier {subcarrier index 0}. As a result, 48 BPSK symbols can be mapped to subcarrier indices -26 to -22, -20 to -8, -6 to -1, +1 to +6, +8 to +20, and +22 to +26. have. The transmitting STA may additionally map a signal of {-1, -1, -1, 1} to the subcarrier index {-28, -27, +27, 28}. The above signal can be used for channel estimation in the frequency domain corresponding to {-28, -27, +27, 28}.

The transmitting STA may generate the RL-SIG generated in the same manner as the L-SIG. BPSK modulation is applied for RL-SIG. The receiving STA may know that the received PPDU is an HE PPDU or an EHT PPDU based on the presence of the RL-SIG.

After the RL-SIG of FIG. 18, a Universal SIG (U-SIG) may be inserted. The U-SIG may be referred to by various names such as a first SIG field, a first SIG, a first type SIG, a control signal, a control signal field, and a first (type) control signal.

The U-SIG may include N bits of information and may include information for identifying the type of EHT PPDU. For example, the U-SIG may be configured based on two symbols (eg, two consecutive OFDM symbols). Each symbol (eg, OFDM symbol) for U-SIG may have a duration of 4 us. Each symbol of U-SIG can be used to transmit 26 bits of information. For example, each symbol of U-SIG may be transmitted and received based on 52 data tones and 4 pilot tones.

Through the U-SIG (or U-SIG field), for example, A-bit information (eg, 52 un-coded bits) may be transmitted, and the first symbol of U-SIG is the first of the total A-bit information. X-bit information (eg, 26 un-coded bits) is transmitted, and the second symbol of U-SIG can transmit remaining Y-bit information (eg, 26 un-coded bits) of the total A-bit information. have. For example, the transmitting STA may acquire 26 un-coded bits included in each U-SIG symbol. The transmitting STA may generate a 52-coded bit by performing convolutional encoding (ie, BCC encoding) based on a rate of R=1/2, and may perform interleaving on the 52-coded bit. The transmitting STA may generate 52 BPSK symbols allocated to each U-SIG symbol by performing BPSK modulation on the interleaved 52-coded bits. One U-SIG symbol may be transmitted based on 56 tones (subcarriers) from subcarrier index -28 to subcarrier index +28, excluding DC index 0. 52 BPSK symbols generated by the transmitting STA may be transmitted based on the remaining tones (subcarriers) excluding the pilot tones -21, -7, +7, and +21 tones.

For example, A-bit information (e.g., 52 un-coded bits) transmitted by U-SIG is a CRC field (e.g., a 4-bit long field) and a tail field (e.g., a 6-bit long field). ) Can be included. The CRC field and the tail field may be transmitted through the second symbol of U-SIG. The CRC field may be generated based on 26 bits allocated to the first symbol of U-SIG and the remaining 16 bits excluding the CRC/tail field in the second symbol, and may be generated based on a conventional CRC calculation algorithm. I can. In addition, the tail field may be used to terminate trellis of a convolutional decoder, and may be set to “000000”, for example.

A bit information (eg, 52 un-coded bits) transmitted by U-SIG (or U-SIG field) may be divided into version-independent bits and version-dependent bits. For example, the size of version-independent bits may be fixed or variable. For example, version-independent bits may be allocated only to the first symbol of U-SIG, or version-independent bits may be allocated to both the first symbol and the second symbol of U-SIG. For example, version-independent bits and version-dependent bits may be referred to by various names such as a first control bit and a second control bit.

For example, the version-independent bits of U-SIG may include a 3-bit PHY version identifier. For example, the 3-bit PHY version identifier may include information related to the PHY version of the transmission/reception PPDU. For example, the first value of the 3-bit PHY version identifier may indicate that the transmission/reception PPDU is an EHT PPDU. In other words, when transmitting the EHT PPDU, the transmitting STA may set a 3-bit PHY version identifier as the first value. In other words, the receiving STA may determine that the received PPDU is an EHT PPDU based on the PHY version identifier having the first value.

For example, the version-independent bits of U-SIG may include a 1-bit UL/DL flag field. The first value of the 1-bit UL/DL flag field is related to UL communication, and the second value of the UL/DL flag field is related to DL communication.

For example, the version-independent bits of U-SIG may include information on the length of TXOP and information on the BSS color ID.

For example, when the EHT PPDU is classified into various types (e.g., EHT PPDU supporting SU, EHT PPDU supporting MU, EHT PPDU related to Trigger Frame, EHT PPDU related to Extended Range transmission, etc.) , Information on the type of the EHT PPDU may be included in version-dependent bits of U-SIG.

For example, the U-SIG includes 1) a bandwidth field including information on the bandwidth, 2) a field including information on the MCS technique applied to the EHT-SIG, and 3) dual subcarrier modulation in the EHT-SIG. An indication field containing information related to whether or not subcarrier modulation (DCM) technique is applied, 4) A field containing information about the number of symbols used for EHT-SIG, 5) EHT-SIG is generated over the entire band It may include a field including information on whether or not, 6) a field including information on the type of EHT-LTF/STF, and 7) information on a field indicating the length of the EHT-LTF and the CP length.

Preamble puncturing may be applied to the PPDU of FIG. 18. Preamble puncturing refers to applying puncturing to some bands (eg, Secondary 20 MHz band) among the entire bands of the PPDU. For example, when an 80 MHz PPDU is transmitted, the STA may apply puncture to the secondary 20 MHz band of the 80 MHz band, and transmit the PPDU only through the primary 20 MHz band and the secondary 40 MHz band.

For example, the pattern of preamble puncturing may be set in advance. For example, when the first puncturing pattern is applied, puncturing may be applied only to a secondary 20 MHz band within an 80 MHz band. For example, when the second puncturing pattern is applied, puncturing may be applied to only one of two secondary 20 MHz bands included in the secondary 40 MHz band within the 80 MHz band. For example, when the third puncturing pattern is applied, puncturing may be applied only to the secondary 20 MHz band included in the primary 80 MHz band within the 160 MHz band (or 80+80 MHz band). For example, when the fourth puncturing pattern is applied, the primary 40 MHz band included in the primary 80 MHz band within the 160 MHz band (or 80+80 MHz band) is present and does not belong to the primary 40 MHz band. Puncturing may be applied to at least one 20 MHz channel that does not exist.

Information on preamble puncturing applied to the PPDU may be included in U-SIG and/or EHT-SIG. For example, a first field of U-SIG may contain information on a contiguous bandwidth of a PPDU, and a second field of U-SIG may contain information on preamble puncturing applied to a PPDU. have.

For example, U-SIG and EHT-SIG may include information on preamble puncturing based on the following method. When the bandwidth of the PPDU exceeds 80 MHz, the U-SIG can be individually configured in units of 80 MHz. For example, when the bandwidth of the PPDU is 160 MHz, the PPDU may include a first U-SIG for a first 80 MHz band and a second U-SIG for a second 80 MHz band. In this case, the first field of the first U-SIG includes information on the 160 MHz bandwidth, and the second field of the first U-SIG is information on preamble puncturing applied to the first 80 MHz band (i.e., preamble Information about puncturing patterns) may be included. In addition, the first field of the second U-SIG includes information on a 160 MHz bandwidth, and the second field of the second U-SIG is information on preamble puncturing applied to the second 80 MHz band (ie, preamble puncturing). Information on the processing pattern) may be included. Meanwhile, the EHT-SIG continuing to the first U-SIG may include information on preamble puncturing applied to the second 80 MHz band (ie, information on preamble puncturing pattern), and in the second U-SIG Consecutive EHT-SIG may include information on preamble puncturing applied to the first 80 MHz band (ie, information on preamble puncturing pattern).

Additionally or alternatively, U-SIG and EHT-SIG may include information on preamble puncturing based on the following method. The U-SIG may include information on preamble puncturing for all bands (that is, information on preamble puncturing pattern). That is, the EHT-SIG does not include information on preamble puncturing, and only U-SIG may include information on preamble puncturing (ie, information on preamble puncturing pattern).

U-SIG can be configured in units of 20 MHz. For example, when an 80 MHz PPDU is configured, U-SIG can be duplicated. That is, the same four U-SIGs may be included in the 80 MHz PPDU. PPDUs exceeding the 80 MHz bandwidth may contain different U-SIGs.

The EHT-SIG of FIG. 18 may include the technical features of HE-SIG-B shown in the example of FIGS. 8 to 9 as it is. The EHT-SIG may be referred to by various names such as a second SIG field, a second SIG, a second type SIG, a control signal, a control signal field, and a second (type) control signal.

The EHT-SIG may include N-bit information (eg, 1-bit information) regarding whether the EHT-PPDU supports the SU mode or the MU mode.

EHT-SIG can be configured based on various MCS techniques. As described above, information related to the MCS technique applied to the EHT-SIG may be included in the U-SIG. The EHT-SIG can be configured based on the DCM technique. For example, of the N data tones (e.g., 52 data tones) allocated for EHT-SIG, the first modulation technique is applied to half of the continuous tones, and the second modulation is applied to the remaining half of the tones. The technique can be applied. In other words, the transmitting STA modulates specific control information with a first symbol based on the first modulation technique and allocates it to a continuous half tone, modulates the same control information with a second symbol based on the second modulation technique, and It can be assigned to half of the tone. As described above, information related to whether the DCM technique is applied to the EHT-SIG (eg, a 1-bit field) may be included in the U-SIG. The EHT-STF of FIG. 18 may be used to improve automatic gain control estimation in a multiple input multiple output (MIMO) environment or an OFDMA environment. The EHT-LTF of FIG. 18 may be used to estimate a channel in a MIMO environment or an OFDMA environment.

The EHT-STF of FIG. 18 may be set in various types. For example, the first type of STF (that is, 1x STF) may be generated based on a first type STF sequence in which non-zero coefficients are arranged at 16 subcarrier intervals. The STF signal generated based on the first type STF sequence may have a period of 0.8 μs, and the 0.8 μs period signal may be repeated 5 times to become a first type STF having a length of 4 μs. For example, the second type of STF (that is, 2x STF) may be generated based on a second type STF sequence in which non-zero coefficients are arranged at 8 subcarrier intervals. The STF signal generated based on the second type STF sequence may have a period of 1.6 μs, and the 1.6 μs period signal may be repeated 5 times to become a second type EHT-STF having a length of 8 μs. Hereinafter, an example of a sequence (ie, an EHT-STF sequence) for configuring the EHT-STF is presented. The following sequence can be modified in various ways.

The EHT-STF may be configured based on the following M sequence.

M = {-1, -1, -1, 1, 1, 1, -1, 1, 1, 1, -1, 1, 1, -1, 1}

EHT-STF for 20 MHz PPDU may be configured based on the following equation. The following example may be a first type (ie, 1x STF) sequence. For example, the first type sequence may be included in an EHT-PPDU other than a trigger-based (TB) PPDU. In the following equation, (a:b:c) may mean a section defined as a b tone interval (ie, subcarrier interval) from a tone index (ie, subcarrier index) to c tone index. For example, Equation 2 below may represent a sequence defined by 16 tone intervals from the tone index -112 to the 112 index. Since subcarrier spacing of 78.125 kHz is applied to the EHT-STF, 16 tone intervals may mean that EHT-STF coefficients (or elements) are arranged at 78.125 * 16 = 1250 kHz intervals. Also, * means multiplication and sqrt() means square root.

EHT-STF(-112:16:112) = {M}*(1 + j)/sqrt(2)

EHT-STF(0) = 0

EHT-STF for 40 MHz PPDU may be configured based on the following equation. The following example may be a first type (ie, 1x STF) sequence.

EHT-STF(-240:16:240) = {M, 0, -M}*(1 + j)/sqrt(2)

EHT-STF for the 80 MHz PPDU may be configured based on the following equation. The following example may be a first type (ie, 1x STF) sequence.

EHT-STF(-496:16:496) = (M, 1, -M, 0, -M, 1, -M}*(1 + j)/sqrt(2)

The EHT-STF for 160 MHz PPDU may be configured based on the following equation. The following example may be a first type (ie, 1x STF) sequence.

EHT-STF(-1008:16:1008) = (M, 1, -M, 0, -M, 1, -M, 0, -M, -1, M, 0, -M, 1, -M} *(1 + j)/sqrt(2)

The sequence for the lower 80 MHz of the EHT-STF for the 80+80 MHz PPDU may be the same as in Equation 4. A sequence for an upper 80 MHz among EHT-STFs for an 80+80 MHz PPDU may be configured based on the following equation.

EHT-STF(-496:16:496) = {-M, -1, M, 0, -M, 1, -M}*(1 + j)/sqrt(2)

Equations 7 to 11 below relate to an example of a second type (ie, 2x STF) sequence.

EHT-STF(-120:8:120) = (M, 0, -M}*(1 + j)/sqrt(2)

EHT-STF for 40 MHz PPDU may be configured based on the following equation.

EHT-STF(-248:8:248) = (M, -1, -M, 0, M, -1, M}*(1 + j)/sqrt(2)

EHT-STF(-248) = 0

EHT-STF(248) = 0

EHT-STF for the 80 MHz PPDU may be configured based on the following equation.

EHT-STF(-504:8:504) = (M, -1, M, -1, -M, -1, M, 0, -M, 1, M, 1, -M, 1, -M} *(1 + j)/sqrt(2)

The EHT-STF for 160 MHz PPDU may be configured based on the following equation.

EHT-STF(-1016:16:1016) = (M, -1, M, -1, -M, -1, M, 0, -M, 1, M, 1, -M, 1, -M, 0, -M, 1, -M, 1, M, 1, -M, 0, -M, 1, M, 1, -M, 1, -M}*(1 + j)/sqrt(2)

EHT-STF(-8)=0, EHT-STF(8)=0,

EHT-STF(-1016)=0, EHT-STF(1016)=0

The sequence for the lower 80 MHz of the EHT-STF for the 80+80 MHz PPDU may be the same as in Equation 9. A sequence for an upper 80 MHz among EHT-STFs for an 80+80 MHz PPDU may be configured based on the following equation.

EHT-STF(-504:8:504) = {-M, 1, -M, 1, M, 1, -M, 0, -M, 1, M, 1, -M, 1, -M}* (1 + j)/sqrt(2)

EHT-STF(-504)=0,

EHT-STF(504)=0

The EHT-LTF may have first, second, and third types (ie, 1x, 2x, 4x LTF). For example, the first/second/third type LTF may be generated based on an LTF sequence in which a non-zero coefficient is arranged at 4/2/1 subcarrier intervals. The first/second/third type LTF may have a time length of 3.2/6.4/12.8 μs. In addition, GIs of various lengths (eg, 0.8/1/6/3.2 μs) may be applied to the first/second/third type LTF.

Information on the type of STF and/or LTF (including information on GI applied to the LTF) may be included in the SIG A field and/or the SIG B field of FIG. 18.

The PPDU of FIG. 18 (ie, EHT-PPDU) may be configured based on the examples of FIGS. 5 and 6.

For example, an EHT PPDU transmitted on a 20 MHz band, that is, a 20 MHz EHT PPDU may be configured based on the RU of FIG. 5. That is, the location of the EHT-STF, EHT-LTF, and RU of the data field included in the EHT PPDU may be determined as shown in FIG. 5.

The EHT PPDU transmitted on the 40 MHz band, that is, the 40 MHz EHT PPDU may be configured based on the RU of FIG. 6. That is, the location of the EHT-STF, EHT-LTF, and RU of the data field included in the EHT PPDU may be determined as shown in FIG. 6.

Since the RU position of FIG. 6 corresponds to 40 MHz, if the pattern of FIG. 6 is repeated twice, a tone-plan for 80 MHz may be determined. That is, the 80 MHz EHT PPDU may be transmitted based on a new tone-plan in which the RU of FIG. 6 is repeated twice, not the RU of FIG. 7.

When the pattern of FIG. 6 is repeated twice, 23 tones (ie, 11 guard tones + 12 guard tones) may be configured in the DC region. That is, a tone-plan for an 80 MHz EHT PPDU allocated based on OFDMA may have 23 DC tones. In contrast, the 80 MHz EHT PPDU (i.e., non-OFDMA full bandwidth 80 MHz PPDU) allocated on the basis of Non-OFDMA is configured based on 996 RU and consists of 5 DC tones, 12 left guard tones, and 11 right guard tones. It may include.

The tone-plan for 160/240/320 MHz may be configured in a form of repeating the pattern of FIG. 6 several times.

The PPDU of FIG. 18 may be identified as an EHT PPDU based on the following method.

The receiving STA may determine the type of the received PPDU as the EHT PPDU based on the following items. For example, 1) the first symbol after the L-LTF signal of the received PPDU is BPSK, 2) RL-SIG where the L-SIG of the received PPDU is repeated is detected, and 3) the length of the L-SIG of the received PPDU When the result of applying “modulo 3” to the field value is detected as “0”, the received PPDU may be determined as an EHT PPDU. When the received PPDU is determined to be an EHT PPDU, the receiving STA is the type of the EHT PPDU (e.g., SU/MU/Trigger-based/Extended Range type) based on bit information included in the symbol after RL-SIG of FIG. ) Can be detected. In other words, the receiving STA is 1) the first symbol after the L-LTF signal, which is BSPK, 2) RL-SIG that is consecutive to the L-SIG field and is the same as L-SIG, and 3) the result of applying “modulo 3” is Based on the L-SIG including the Length field set to “0”, the received PPDU may be determined as an EHT PPDU.

For example, the receiving STA may determine the type of the received PPDU as an HE PPDU based on the following. For example, 1) the first symbol after the L-LTF signal is BPSK, 2) RL-SIG repeating L-SIG is detected, and 3) “modulo 3” is applied to the length value of L-SIG. When the result is detected as “1” or “2”, the received PPDU may be determined as an HE PPDU.

For example, the receiving STA may determine the type of the received PPDU as non-HT, HT, and VHT PPDU based on the following items. For example, if 1) the first symbol after the L-LTF signal is BPSK, and 2) the L-SIG repeating RL-SIG is not detected, the received PPDU will be determined as non-HT, HT and VHT PPDU. I can. In addition, even if the receiving STA detects the repetition of RL-SIG, if the result of applying “modulo 3” to the length value of L-SIG is detected as “0”, the receiving PPDU is non-HT, HT and VHT PPDU. It can be judged as.

In the following example, (transmit/receive/uplink/downward) signal, (transmit/receive/uplink/downlink) frame, (transmit/receive/uplink/downlink) packet, (transmit/receive/uplink/downlink) data unit, ( A signal displayed as transmission/reception/up/down) data may be a signal transmitted/received based on the PPDU of FIG. 18. The PPDU of FIG. 18 may be used to transmit and receive various types of frames. For example, the PPDU of FIG. 18 may be used for a control frame. An example of a control frame may include request to send (RTS), clear to send (CTS), Power Save-Poll (PS-Poll), BlockACKReq, BlockAck, NDP (Null Data Packet) announcement, and Trigger Frame. For example, the PPDU of FIG. 18 may be used for a management frame. An example of a management frame may include a Beacon frame, (Re-)Association Request frame, (Re-)Association Response frame, Probe Request frame, and Probe Response frame. For example, the PPDU of FIG. 18 may be used for a data frame. For example, the PPDU of FIG. 18 may be used to simultaneously transmit at least two or more of a control frame, a management frame, and a data frame.

1. 802.11ax 무선랜 시스템의 톤 플랜(tone plan)1. Tone plan of 802.11ax wireless LAN system

In this specification, the tone plan relates to a rule for determining the size of a Resource Unit (RU) and/or a location of the RU. Hereinafter, a tone plan applied to a PPDU according to the IEEE 802.11ax standard, that is, an HE PPDU will be described. In other words, the following describes the RU size and the location of the RU applied to the HE PPDU, and control information related to the RU applied to the HE PPDU.

In this specification, the control information related to the RU (or control information related to the tone plan) is applied to the size and location of the RU, information of a user STA allocated to a specific RU, a frequency bandwidth for a PPDU including the RU, and/or a specific RU. It may include control information on the modulation scheme to be used. Control information related to the RU may be included in the SIG field. For example, in the IEEE 802.11ax standard, control information related to RU is included in the HE-SIG-B field. That is, in the process of generating the transmission PPDU, the transmitting STA may include control information on the RU included in the PPDU in the HE-SIG-B field. In addition, the receiving STA receives the HE-SIG-B included in the receiving PPDU, obtains control information included in the HE-SIG-B, determines whether there is an RU allocated to the receiving STA, and determines whether the HE-SIG- The RU allocated based on B can be decoded.

In the IEEE 802.11ax standard, the HE-STF, HE-LTF, and Data fields could be configured in units of RU. That is, when the first RU for the first receiving STA is configured, the STF/LTF/Data field for the first receiving STA may be transmitted/received through the first RU.

In the IEEE 802.11ax standard, a PPDU (ie, SU PPDU) for one receiving STA and a PPDU (ie, MU PPDU) for a plurality of receiving STAs are separately defined, and a tone plan for each is separately defined. Specific details will be described below.

The RU defined in 11ax may include a plurality of subcarriers. For example, when the RU includes N subcarriers, it may be expressed as N-tone RU or N RU. The location of a specific RU may be indicated by a subcarrier index. The subcarrier index may be defined in units of subcarrier frequency spacing. In the 11ax standard, the subcarrier frequency spacing is 312.5 kHz or 78.125 kHz, and the subcarrier frequency spacing for RU is 78.125 kHz. That is, the subcarrier index +1 for the RU may mean a position that is increased by 78.125 kHz more than the DC tone, and the subcarrier index of -1 for the RU may mean a position that is decreased by 78.125 kHz more than the DC tone. For example, if the location of a specific RU is indicated as [-121:-96], the RU is located in the area from subcarrier index -121 to subcarrier index -96, and as a result, the RU is 26 subcarriers. It may include.

The N-tone RU may include a preset pilot tone.

2. 널 서브캐리어(Null subcarrier) 및 파일럿 서브캐리어(pilot subcarrier)2. Null subcarrier and pilot subcarrier

Describes subcarriers and resource allocation in the 802.11ax system.

The OFDM symbol is composed of subcarriers, and the number of subcarriers can function as a bandwidth of a PPDU. In the WLAN 802.11 system, the data subcarrier used for data transmission, the pilot subcarrier used for phase information and parameter tracking, and unused unused for data transmission and pilot transmission. ) The subcarrier is defined.

The HE MU PPDU using OFDMA transmission may be transmitted by mixing 26 ton RU, 52 ton RU, 106 ton RU, 242 ton RU, 484 ton RU and 996 ton RU.

Here, the 26-tone RU consists of 24 data subcarriers and two pilot subcarriers. The 52-tone RU consists of 48 data subcarriers and 4 pilot subcarriers. The 106-ton RU consists of 102 data subcarriers and 4 pilot subcarriers. The 242-ton RU consists of 234 data subcarriers and 8 pilot subcarriers. The 484-ton RU consists of 468 data subcarriers and 16 pilot subcarriers. The 996-ton RU consists of 980 data subcarriers and 16 pilot subcarriers.

1) null subcarrier

5-7, there is a null subcarrier between the 26-tone RU, 52-tone RU and 106-tone RU positions. The null subcarrier is located near the DC or edge tone to protect against transmit center frequency leakage, receiver DC offset and interference from adjacent RUs. The null subcarrier has zero energy. The index of the null subcarrier is enumerated as follows.

The location of the null subcarrier for each 80 MHz frequency segment of the 80+80 MHz HE PPDU shall follow the location of the 80 MHz HE PPDU.

2) Pilot subcarrier

If the pilot subcarrier is present in the HE-LTF field of HE SU PPDU, HE MU PPDU, HE ER SU PPDU or HE TB PPDU, the position of the pilot sequence in the HE-LTF field and the data field is the same as the position of 4x HE-LTF can do. In 1x HE-LTF, the position of the pilot sequence in the HE-LTF consists of pilot subcarriers for the data field multiplied by 4 times. When the pilot subcarrier exists in the 2x HE-LTF, the position of the pilot subcarrier should be the same as the position of the pilot in the 4x data symbol. All pilot subcarriers are located at even indexes listed below.

At 160MHz or 80+80MHz, the position of the pilot subcarrier should use the same 80MHz position for both 80MHz.

3. HE 송신 절차(HE transmit procedure) 및 성상 매핑(constellation mapping)3. HE transmit procedure and constellation mapping

In the 802.11ax wireless LAN system, the transmission procedure in PHY (physical) is a transmission procedure for a single user (HE SU) PPDU, a transmission procedure for an extended range (HE ER) SU PPDU, and a transmission procedure for an HE MU (multi user) PPDU. There are procedures and transmission procedures for HE trigger-based (TB) PPDU. The FORMAT field of PHY-TXSTART.request(TXVECTOR) may be the same as HE_SU, HE_MU, HE_ER_SU, or HE_TB. The transmission procedures do not describe the operation of an optional feature such as Dual Carrier Modulation (DCM). Among the various transmission procedures, FIG. 21 shows only the PHY transmission procedure for HE SU PPDU.

19 shows an example of a PHY transmission procedure for HE SU PPDU.

In order to transmit data, the MAC generates a PHY-TXSTART.request primitive that causes the PHY entity to enter the transmission state. In addition, the PHY is configured to operate at an appropriate frequency through station management through PLME. Other transmission parameters such as HE-MCS, coding type and transmit power are set via PHY-SAP using the PHY-TXSTART.request(TXVECTOR) primitive. After transmitting the PPDU carrying the trigger frame, the MAC sublayer may issue a PHY-TRIGGER.request along with the TRIGVECTOR parameter that provides the information necessary to demodulate the expected HE TB PPDU response to the PHY entity. have.

The PHY indicates the state of the primary channel and other channels through PHY-CCA.indication. The transmission of the PPDU must be started by the PHY after receiving the PHY-TXSTART.request(TXVECTOR) primitive.

After the PHY preamble transmission starts, the PHY entity immediately initiates data scrambling and data encoding. The encoding method for the data field is based on TXVECTOR's FEC_CODING, CH_BANDWIDTH, NUM_STS, STBC, MCS, and NUM_USERS parameters.

The SERVICE field and PSDU are encoded in a transmitter block diagram to be described later. Data must be exchanged between MAC and PHY through a series of PHY-DATA.request(DATA) primitives issued by the MAC and PHY-DATA.confirm primitives issued by the PHY. PHY padding bits are appended to the PSDU to make the number of bits of the coded PSDU an integer multiple of the number of coded bits for each OFDM symbol.

Transmission is immediately terminated by the MAC through PHY-TXEND.request primitive. PSDU transmission is terminated by receiving the PHY-TXEND.request primitive. Each PHY-TXEND.request primitive may be informed that it has been received from the PHY together with the PHY-TXEND.confirm primitive.

Packet extension and/or signal extension may exist in the PPDU. PHY-TXEND.confirm primitive is generated from the actual end time of the most recent PPDU, the end time of packet extension, and the end time of signal extension.

In the PHY, the GI (Guard Interval) indicated along with the GI duration in the GI_TYPE parameter of TXVECTOR is inserted into all data OFDM symbols as a countermeasure against delay spread.

When the PPDU transmission is complete, the PHY entity enters the receiving state.

The following block diagrams are used to generate each field of the HE PPDU.

a) pre-FEC PHY padding

b) Scrambler

c) FEC (BCC or LDPC) encoders

d) post-FEC PHY padding

e) Stream parser

f) Segment parser (for contiguous 160MHz and non-contiguous 80+80MHz transmission)

g) BCC interleaver

h) Constellation mapper

i) DCM tone mapper

j) Pilot insertion

k) Replication over multiple 20MHz (for BW>20MHz)

l) Multiplication by 1 ^st column of P _HE-LTF

m) LDPC tone mapper

n) Segment deparser

o) Space time block code (STBC) encoder for one spatial stream

p) Cyclic shift diversity (CSD) per STS insertion

q) Spatial mapper

r) Frequency mapping

s) Inverse discrete Fourier transform (IDFT)

f) Cyclic shift diversity (CSD) per chain insertion

u) Guard interval (GI) insertion

v) Windowing

FIG. 20 is to generate a data field of an HE PPDU capable of UL transmission or DL non-MU MIMO transmission in a 26-ton RU, 52-ton RU, 106-ton RU, or 242-ton RU with BCC (Binary Convolution Coding) encoding applied. A block diagram of a transmitting device used for this is shown.

Referring to FIG. 20, for a bit stream input to a block diagram of a transmission device, 1) Pre-FEC PHY padding is performed, 2) scrambling operation is performed, 3) BCC encoding is performed, and 4) Post-FEC PHY padding is performed, 5) a stream parsing operation is performed to map the encoded bits to a specific spatial stream, 6) BCC interleaving is performed for each spatial stream, and 7) spatial streams A modulation symbol may be generated by performing constellation mapping for each.

The DCM tone mapper, which is a part of the constellation mapper, is applied only when DCM is indicated for the RU. The block to the right of the spatial mapping block as well as a subset of the transmission device block diagram consisting of the constellation mapper and the CSD block is also used to generate the HE-LTF field or the HE-STF field. .

21 shows that LDPC (Low Density Parity Check) encoding is applied, and UL transmission or DL non-MU MIMO transmission can be performed in 26 ton RU, 52 ton RU, 106 ton RU, 242 ton RU, 484 ton RU or 996 ton RU. Shows a block diagram of a transmitting device used to generate a data field of an HE PPDU.

Referring to FIG. 21, for a bit stream input to a transmission device block diagram, 1) Pre-FEC PHY padding is performed, 2) scrambling operation is performed, 3) LDPC encoding is performed, and 4) Post-FEC PHY padding is performed, 5) a stream parsing operation is performed to map the encoded bits to a specific spatial stream, 6) constellation mapping is performed for each spatial stream, and 7) the above The LDPC tone mapping may be performed on a modulation symbol generated based on constellation mapping.

The transmission device block diagram of FIG. 21 is also applied to a data field of an HE MU PPDU and a data field of an HE TB PPDU transmitted from an RU allocated to one user (regardless of whether or not spatially multiplexed with another user). The DCM tone mapper, which is part of the constellation mapper, is applied only when DCM is directed to the RU.

In the block diagrams of the transmitting devices of FIGS. 20 and 21, since there is no segment parser, the above operations are performed for one frequency segment. However, if necessary, segment parsing in which a frequency segment is divided by adding a segment parser after the stream parser in the transmission device block diagrams of FIGS. 20 and 21 may be performed. Accordingly, the BCC interleaving, the constellation mapping, or the LDPC tone mapping may be performed for each frequency segment (for each RU in a multi-RU).

In addition, in HE MU transmission, except that cyclic shift diversity (CSD) is performed with knowledge of the spatial-temporal stream start index for the corresponding user, the PPDU encoding processor is used for each user until the input of the spatial mapping block. Unit) is performed independently. All user data of the RU is mapped and combined in the transmission chain of the spatial mapping block.

Hereinafter, constellation mapping will be described.

Constellation mapping refers to the mapping of the input bits of the constellation mapper and the complex constellation points for BPSK, QPSK, 16-QAM and 256-QAM. That is, the constellation mapper may map bits in the output of the stream parser or segment parser (if any) to the complex constellation points according to the modulation scheme.

The DCM technique can be applied only to the data field and/or the SIG-B field of the HE PPDU. In addition, the DCM technique may or may not be used in the transmitting device (optional feature).

More specific details on the DCM technique of 11ax are as follows.

DCM is a selective modulation scheme for HE-SIG-B and data fields. DCM can be applied to HE SU PPDU and HE ER SU PPDU. In the HE MU PPDU or HE TB PPDU, DCM may be applied to an RU including data for one user and not to an RU including data for a plurality of users.

DCM is applicable only for HE-

MCS

0, 1, 3 and 4. DCM is applicable only in Nss=1 or Nss=2 (for one user RU in HE MU PPDU, Nss,r,u=1 or Nss,r,u=2). DCM is not applicable with MU-MIMO or STBC.

When DCM is used, the bit sequence is mapped to a pair of symbols (d' _k , d' _q(k) ). At this time, k has a range of 0<=k<=N _SD- 1, and q(k) is N _SD <=q(k)<= in order to use frequency diversity for a 996-ton RU or a smaller RU. It has a range of 2N _SD -1. For a 2x996 ton RU, k has a range of 0<=k<=N _SD /2-1, and q(k) has a range of N _SD /2<=q(k)<=N _SD -1. . To maximize frequency diversity, the index of a pair of DCM subcarriers (k, q(k)) is q(k)=k+N _SD for a 996 ton RU or smaller RU and q( k)=k+N _SD /2. Here, N _SD has a half value of N if the _SD to _SD N when the DCM = 1, DCM = 0.

Modulation bits to which DCM is applied can be described as follows.

In the following, LDPC tone mapping will be described.

LDPC tone mapping should be performed in all LDPC-encoded streams using the LDPC tone mapping distance parameter D _TM . D _TM is a constant for each bandwidth and has a value for each band as follows. LDPC tone mapping should not be performed on streams encoded using BCC.

For VHT PPDU transmission, LDPC tone mapping for the LDPC-coded stream for user u may be performed as follows by substituting a complex number of streams generated by a constellation mapper.

As a result of the LDPC tone mapping operation, two consecutively generated complex constellation numbers d' _k,i,n,l,u and d' _k+1,i,n,l,u respectively May be transmitted in two data tones separated from each other by at least D _TM -1. For example, d' _k,i,n,l,u is transmitted in the first data tone, d' _k+1,i,n,l,u is transmitted in the second data tone, and the first and The second data tones may be separated from each other by D _TM -1. The above operation is performed using a matrix with D _TM rows and N _SD /D _TM columns (for 20 MHz, 40 MHz, 80 MHz or 80+80 MHz) or N _SD /2*D _TM columns (for 160 MHz), using i, n and Complex numbers d' _0,i,n,l,u , ..., for u variablesIt is the same as block-interleaving d' _{NSD-1,i,n,l,u} . At this time, d' _0,i,n,l,u , ...,d' _{NSD-1,i,n,l,u} is written row-wise in the matrix, d' _0,i,n,l,u , ...,d' _{NSD-1,i,n,l,u} are read column-wise from the matrix.

LDPC tone mapping is performed separately for an upper 80MHz and a lower 80MHz of 160MHz or 80+80MHz transmission indicated by the frequency subblock index l.

Since LDPC tone mapping is not performed on the BCC coded stream, the following equation may be applied to the BCC coded stream.

In addition, LDPC tone mapping must be performed on all LDPC-encoded streams mapped to resource units (RU). LDPC tone mapping should not be performed for streams using BCC. When DCM is applied to an LDPC-encoded stream, D _{TM_DCM} should be applied to both the lower half data subcarrier of the RU and the upper half data subcarrier of the RU. LDPC tone mapping distance parameters D _TM and D _{TM_DCM} are constants for values for each RU size and other RU sizes.

LDPC tone mapping parameters D _TM and D _{TM_DCM} are _applied for each frequency subblock l=0 and l=1.

For the HE PPDU without DCM, LDPC tone mapping for the LDPC-encoded stream for the user u in the r-th RU may be performed as follows by substituting a complex number of streams generated by a constellation mapper.

For the HE PPDU where DMC is applied to the data field, LDPC tone mapping for the LDPC-encoded stream for user u at the r-th RU is performed by substituting the complex number of streams generated by the constellation mapper as follows. Can be.

For 26-, 52-, 106-, 242-, 484- and 996-tone RUs, the LDPC tone mapper is defined as one segment. LDPC tone mapping is performed separately for the upper 80MHz and the lower 80MHz frequency segments of the 2x996-tone RU indicated by the frequency subblock index 1.

4. 본 명세서에 적용 가능한 실시예4. Examples applicable to this specification

In the WLAN 802.11 system, in order to increase peak throughput, transmission of an increased stream is considered by using a wider band than the existing 11ax or by using more antennas. In addition, the present specification also considers a method of aggregation and use of various bands.

In this specification, a method of distributing a constellation mapped signal to multi-RUs in a situation in which a PPDU is transmitted by allocating a multi-RU to one STA is proposed.

In the existing 802.11ax, data can be transmitted using 26/52/106/242/484/996/2x996-tone RU, and in this case, one STA can be allocated to only one RU. That is, in the existing 802.11ax system, one STA has been assigned only one RU. In 802.11be, a multi-RU method is introduced, so that one STA can be assigned multiple RUs instead of one RU. As a result, the STA can transmit the PPDU using multiple RUs, thereby improving throughput. Information for allocating Multi-RU may be announced in the EHT-SIG field of FIG. 18.

The EHT-SIG field may include EHT-SIG-A/EHT-SIG-B/EHT-SIG-C, and the like, and RU allocation information may be defined in the field. In this situation, we propose a method of distributing constellation mapped signals to multi-RU.

In the transmission device block diagrams of FIGS. 20 and 21, a constellation mapped signal parser may be defined after the constellation mapper to allocate data to the multi-RU. However, in the present specification, when multiple RUs (Multi-RUs) are allocated, signaling and hardware complexity for this increases, so it is assumed that only two RUs can be allocated to one STA.

That is, the transmission device of the present specification may include all/some of the technical features of FIGS. 20 and 21. That is, after the constellation mapper of FIGS. 20 and 21, a constellation mapped signal parser implemented through a separate block/unit/processor may be additionally included. The constellation mapped signal parser may be configured to support the technical features of Examples 4.1 to 4.2 below.

The size of a plurality of RUs (26/52/106/242-subcarrier, etc.) used in the following example and the location of the RUs may be the same as those of the existing 11ax standard. That is, RU1 and RU2 below may be RUs described above.

4.1. Sequential allocation

This is a method that does not require the definition of an additional constellation mapped signal parser, and allocates constellation mapped signals (i.e., constellation symbol) sequentially from low frequency RU. There is no additional frequency diversity gain, but complexity is achieved by reusing the existing method. You can minimize the increase. For example, assume that STAs are allocated to RU 1 and RU 2. The size of RU 1 is a and the size of RU 2 is b. Here, it is assumed that the RU size is the number of tones excluding pilot tones from all RU tones. In other words, it can be said to be the N _SD of each RU defined in the existing 11ax. (N _SD can also be expressed as N_SD, and it can mean the number of data tones excluding pilot tones) If RU 1 is a low frequency RU, the first a constellation mapped signal is a low frequency in a subcarrier of RU 1 The subcarriers are sequentially allocated, and after that, b constellation mapped signals are sequentially allocated to the b subcarriers of RU 2 from the low frequency subcarrier. Naturally, the constellation mapped signal is mapped only to the data tone excluding the pilot tone.

That is, the above-described allocation or mapping is not performed at the position previously allocated for the pilot tone in RU1/RU2, and the above-described allocation/mapping is performed based on only the position previously allocated for the data tone within RU1/RU2. Can be done. That is, when the X+1 index is allocated for the pilot tone in a specific RU and the X and X+2 indexes are allocated for the data tone, the X index is used while performing the above-described allocation/mapping. A subcarrier consecutive to the subcarrier (ie, the next subcarrier) is a subcarrier having an index of X+2. The above allocation/mapping method can be applied equally to the following. In this way, a constellation mapped signal is sequentially allocated to the RU for each (modulated) symbol.

4.2. Constellation mapped signal parser

To obtain frequency diversity, a specific method can be applied to allocate a constellation mapped signal for each RU for each symbol, and various methods are proposed as follows.

4.2.1. Method 1

Method 1 can alternately allocate constellation mapped signals (ie, constellation symbols) from the front, and can be implemented through relatively low complexity. However, in this method, if the size of each RU is different, if all the signals are allocated to the small RU, the remaining constellation mapped signals are all allocated to the RU of the large size. May not be obtained.

For example, assume that STAs are allocated to RU 1 and RU 2. The size of RU 1 is a, the size of RU 2 is b, and a>b. Here, it is assumed that the RU size is the number of tones excluding pilot tones from all RU tones. In other words, it can be said to be the N _SD of each RU defined in the existing 11ax. If RU 1 is a low frequency RU, the first signal (or symbol) by the constellation mapped signal parser is assigned to the lowest frequency subcarrier of RU 1 (excluding pilot subcarrier), and the next (second) signal ( Or symbol) is assigned to the lowest frequency subcarrier of RU 2 (excluding pilot subcarrier). The next (third) signal (or symbol) is assigned to the next lower frequency subcarrier of RU 1 (except the pilot subcarrier), and the next (fourth) signal (or symbol) is assigned to the next lower frequency subcarrier of RU 2 Assigned (except pilot subcarrier). When all signals (or symbols) are allocated to subcarriers of RU 2, the remaining constellation mapped signals are all allocated to the remaining subcarriers of RU 1. In this way, a constellation mapped signal is allocated to RU 1 and RU 2 for each symbol.

4.2.2. Method 2

Method 2 can allocate a signal in consideration of the RU size. For example, you can assign it like this: Assume that STAs are allocated to RU 1 and RU 2. The size of RU 1 is a, the size of RU 2 is b, and a>b. In other words, it can be said to be the N _SD of each RU defined in the existing 11ax. Here, it is assumed that the RU size is the number of tones excluding pilot tones from all RU tones. In this case, if c=floor(a/b) is defined and RU 1 is a low frequency RU, the constellation mapped signal is the first c signals (or symbols) by the constellation mapped signal parser, in the c lowest frequency subcarriers of RU 1. Is assigned (except the pilot subcarrier), and then one signal (or symbol) is assigned to the lowest frequency subcarrier of RU 2 (excluding the pilot subcarrier). Then c signals (or symbols) are assigned to the next low frequency subcarrier c of RU 1 (except pilot subcarrier), and the next one signal (or symbol) is assigned to the next lower frequency subcarrier of RU 2 (excluding pilot subcarrier). When all signals (or symbols) are allocated to subcarriers of RU 2, the remaining constellation mapped signals are all allocated to the remaining subcarriers of RU 1. In this way, a constellation mapped signal is allocated to RU 1 and RU 2 for each symbol.

As another example, it can be assigned as follows: Assume that STAs are allocated to RU 1 and RU 2. The size of RU 1 is a, and the size of RU 2 is b, and a>b. Here, it is assumed that the RU size is the number of tones excluding pilot tones from all RU tones. In other words, it can be said to be the N _SD of each RU defined in the existing 11ax. In this case, if d=ceil(a/b) is defined and RU 1 is a low frequency RU, the constellation mapped signal is the first d signals (or symbols) by the constellation mapped signal parser to d of the lowest frequency subcarriers of RU 1. Is assigned (except pilot subcarrier), and then one signal (or symbol) is assigned to the lowest frequency subcarrier of RU 2 (excluding pilot subcarrier). The next d signals (or symbols) are assigned to the next d lower frequency subcarriers of RU 1 (except the pilot subcarrier), and the next one signal (or symbol) is assigned to the next lower frequency subcarrier of RU 2 (excluding pilot subcarrier). When all signals (or symbols) are allocated to the subcarriers of RU 1, the remaining constellation mapped signals are all allocated to the remaining subcarriers of RU 2. In this way, a constellation mapped signal is allocated to RU 1 and RU 2 for each symbol.

The example of FIG. 22 may be performed in a transmitting device (AP and/or non-AP STA). Some of each step (or a detailed sub-step to be described later) in the example of FIG. 22 may be omitted or changed.

For example, before FIG. 22 is performed, the AP and the non-AP STA may exchange capability information regarding whether each STA supports Multi-RU allocation. For example, beacon, probe request, probe response, association request, association response, other management frame, other control frame, or MAC header of a general Data PPDU, etc., including capability information regarding whether multi-RU allocation is supported. I can. For example, when an AP (or non-AP STA) can support a plurality of RUs, the capability information on whether to support multi-RU allocation has a first value, otherwise, multi-RU allocation Capability information regarding whether or not support may have a second value. Alternatively, when multi-RU allocation is supported according to the first scheme (for example, the scheme in Section 4.2.1), the capability information regarding whether multi-RU allocation is supported may have a first value, and the second When multi-RU allocation is supported according to a scheme (for example, the scheme of Section 4.2.2), capability information regarding whether multi-RU allocation is supported may have a second value, and multi-RU allocation is If not supported, capability information regarding whether multi-RU allocation is supported may have a third value.

In step S2210, the transmitting device (ie, the transmitting STA) may acquire information on the aforementioned Tone Plan. As described above, the information on the Tone Plan includes the size and location of the RU, control information related to the RU, information on a frequency band including the RU, information on an STA receiving the RU, and the like. In addition, the transmitting STA may receive information on whether to allocate one STA to a plurality of RUs. In addition, when allocating one STA to a plurality of RUs (ie, using multi-RU allocation), the transmitting STA may determine which of the above-described schemes 4.1 to 4.2 to be used.

In step S2220, the transmitting STA may configure/generate a PPDU based on the acquired control information. The step of configuring/generating the PPDU may include configuring/generating each field of the PPDU. That is, step S2220 includes configuring an EHT-SIG-A/B/C field including control information about a tone plan or sounding. That is, in step S2220, the step of configuring a field including control information (eg, N bitmap) indicating the size/location of the RU and/or the identifier of the STA receiving the RU (eg, AID). It may include the step of configuring the containing field.

In addition, step S2220 may include generating an STF/LTF sequence transmitted through a specific RU. The STF/LTF sequence may be generated based on a preset STF generation sequence/LTF generation sequence.

In addition, step S2220 may include generating a data field (ie, MPDU) transmitted through a specific RU.

In step S2230, the transmitting device may transmit the PPDU configured through step S2220 to the receiving device based on step S2230.

During operation S2230, the transmitting device may perform at least one of operations such as CSD, Spatial Mapping, IDFT/IFFT operation, and GI insertion.

In addition, in the process of performing steps S2220/S2230, the transmitting device may perform a constellation mapped signal parsing operation supporting multi-RU allocation. For example, the transmission device may allocate/map a constellation mapped signal/symbol to a plurality of RUs through the techniques of 4.1 to 4.2 described above. As a result, the transmitting device may allocate a plurality of RUs for one receiving STA.

The signal/field/sequence configured according to the present specification may be transmitted in the form of FIG. 18.

Steps S2220 and S2230 described above may be performed as a single step.

The method of configuring the data field of the PPDU through steps S2220 and S2230 described above may be performed based on the devices of FIGS. 20 and 21.

In addition, as shown in FIG. 1, the transmission device may include a memory 112, a processor 111, and a transceiver 113.

The memory 112 may store information on a plurality of Tone-Plans/RUs described herein.

The processor 111 may generate various RUs based on information stored in the memory 112 and configure a PPDU. An example of the PPDU generated by the processor 111 may be as shown in FIG. 1.

The processor 111 may perform all/part of the operations shown in FIG. 22.

The illustrated transceiver 113 includes an antenna and may perform analog signal processing. Specifically, the processor 111 may control the transceiver 113 to transmit a PPDU generated by the processor 111.

Alternatively, the processor 111 may generate a transmission PPDU and store information on the transmission PPDU in the memory 112.

The example of FIG. 23 may be performed in a receiving device (AP and/or non-AP STA).

The example of FIG. 23 may be performed in a receiving STA or a receiving device (AP and/or non-AP STA). Some of the steps (or detailed sub-steps to be described later) in the example of FIG. 23 may be omitted.

For example, before FIG. 23 is performed, the AP and the non-AP STA may exchange capability information regarding whether each STA supports Multi-RU allocation. For example, beacon, probe request, probe response, association request, association response, other management frame, other control frame, or MAC header of a general Data PPDU, etc., including capability information regarding whether multi-RU allocation is supported. I can. For example, when an AP (or non-AP STA) can support a plurality of RUs, the capability information on whether to support multi-RU allocation has a first value, otherwise, multi-RU allocation Capability information regarding whether or not support may have a second value. Alternatively, when multi-RU allocation is supported according to the first scheme (for example, the scheme in Section 4.2.1), the capability information regarding whether multi-RU allocation is supported may have a first value, and the second When multi-RU allocation is supported according to a scheme (for example, the scheme of Section 4.2.2), capability information regarding whether multi-RU allocation is supported may have a second value, and multi-RU allocation is If not supported, capability information regarding whether multi-RU allocation is supported may have a third value.

In step S2310, the receiving device (receiving STA) may receive all or part of the PPDU. The received signal may be in the form of FIG. 18.

The sub-step of step S2310 may be determined based on step S2730. That is, step S2310 is the result of stream parsing, constellation mapping, constellation mapped signal parsing for multi-RU allocation, LDPC tone mapping, CSD, Spatial Mapping, IDFT/IFFT operation, and GI insert operation applied in step S2220/S2230. It is possible to perform an operation to restore.

In step S2320, the receiving device may decode all/part of the PPDU. In addition, the receiving device may acquire a tone plan (ie, RU) or control information related to sounding from the decoded PPDU.

More specifically, the receiving device may decode the L-SIG and EHT-SIG of the PPDU based on the Legacy STF/LTF, and obtain information included in the L-SIG and EHT SIG fields. Information on various Tone Plan (i.e., RU) described in the present specification may be included in EHT-SIG (EHT-SIG-A/B/C, etc.), and the receiving STA is Tone Plan (i.e., RU ) Information can be obtained.

In step S2330, the receiving device may decode the remaining part of the PPDU based on the information on the Tone Plan (ie, RU) acquired through step S2320. For example, the receiving STA may decode the STF/LTF field of the PPDU based on the information on the tone plan (ie, RU). In addition, the receiving STA may decode the data field of the PPDU based on information on the Tone Plan (ie, RU) and obtain an MPDU included in the data field.

Also, the receiving device may perform a processing operation of transferring the decoded data to an upper layer (eg, a MAC layer) through step S2330. In addition, when the generation of a signal from the upper layer to the PHY layer is instructed in response to data transmitted to the upper layer, a subsequent operation may be performed.

The above-described PPDU may be received based on the device of FIG. 1.

As shown in FIG. 1, the receiving device may include a memory 112, a processor 121, and a transceiver 123.

The transceiver 123 may receive a PPDU based on the control of the processor 121. For example, the transceiver 123 may include a plurality of detailed units (not shown). For example, the transceiver 123 may include at least one receiving antenna and may include a filter for a corresponding receiving antenna.

The PPDU received through the transceiver 123 may be stored in the memory 122. The processor 121 may process decoding of the received PPDU through the memory 122. The processor 121 may acquire control information (eg, EHT-SIG) about Tone-Plan/RU included in the PPDU, and store the acquired control information in the memory 122.

The processor 121 may decode the received PPDU. Specifically, an operation of restoring a result of CSD, Spatial Mapping, IDFT/IFFT operation, and GI insertion applied to the PPDU may be performed. The operation of restoring the result of CSD, Spatial Mapping, IDFT/IFFT operation, and GI insertion may be performed through a plurality of processing units (not shown) individually implemented in the processor 2010.

In addition, the processor 121 may decode the data field of the PPDU received through the transceiver 123.

Also, the processor 121 may process the decoded data. For example, the processor 121 may perform a processing operation of transferring information on the decoded data field to an upper layer (eg, a MAC layer). In addition, when the generation of a signal from the upper layer to the PHY layer is instructed in response to data transmitted to the upper layer, a subsequent operation may be performed.

Hereinafter, the above-described embodiment will be described with reference to FIGS. 1 to 23.

The example of FIG. 24 may be performed in a network environment supporting a next-generation wireless LAN system (IEEE 802.11be or EHT wireless LAN system). The next-generation wireless LAN system is a wireless LAN system that is an improved 802.11ax system and may satisfy backward compatibility with the 802.11ax system.

The example of FIG. 24 is performed by a transmitting STA, and the transmitting STA may correspond to an access point (AP). The receiving STA of FIG. 24 may correspond to an STA supporting an Extremely High Throughput (EHT) wireless LAN system.

In step S2410, the transmitting STA (station) generates a PPDU (Physical Protocol Data Unit) including a data field.

In step S2420, the transmitting STA transmits the PPDU to the receiving STA.

C is defined as follows.

c=floor(a/b)

In addition, among the constellation-mapped signals, c third signals following the second signal may be allocated to c data tones having a next lower frequency of the first RU. One fourth signal following the third signal among the constellation-mapped signals may be allocated to one data tone having the next lower frequency of the second RU.

When the constellation-mapped signals are allocated to all data tones of the second RU, the remaining fifth signal among the constellation-mapped signals may be sequentially allocated to the remaining data tones of the first RU.

For example, when a=20 and b=3, c=6. The first 6 signals among the constellation-mapped signals may be allocated to the lowest 6 data tones of the first RU. The next one (7th) signal among the constellation-mapped signals may be allocated to the lowest one data tone of the second RU. The next six (8th to 13th) signals among the constellation-mapped signals may be allocated to the next lower six data tones of the first RU. The next one (14th) signal among the constellation-mapped signals may be allocated to the next lower one data tone of the second RU. The next six (15th to 20th) signals among the constellation-mapped signals may be allocated to the next lower six data tones of the first RU. The next one (21st) signal among the constellation-mapped signals may be allocated to the next lower data tone of the second RU. Accordingly, all of the constellation-mapped signals may be allocated to the data tone of the second RU. Accordingly, the remaining (unallocated) two constellation-mapped signals among the constellation-mapped signals may be allocated to the remaining two data tones of the first RU.

That is, the constellation-mapped signal may be divided into the first to fifth signals by a constellation mapped signal parser. The constellation-mapped signal parser may be included in the transmitting STA as a separate block (or unit or processor) after a constellation mapper.

That is, the first to fifth signals may be parsed for the Multi-RU by the constellation-mapped signal parser and allocated to a data tone. The first to fifth signals are not allocated to a pilot tone in the Multi-RU.

As another example, a method of distributing and allocating a constellation-mapped signal to the Multi-RU by defining a variable d as follows may be described.

The first d sixth signals among the constellation-mapped signals are allocated to d data tones having the lowest frequency of the first RU. One seventh signal following the sixth signal among the constellation-mapped signals is allocated to one data tone having the lowest frequency of the second RU.

D is defined as follows.

d=ceil(a/b)

Here, a is the number of the first data tones, b is the number of the second data tones, a is greater than b, and ceil is a rounding function.

In addition, among the constellation-mapped signals, d eighth signals following the seventh signal may be allocated to d data tones having a next lower frequency of the first RU. One ninth signal following the eighth signal among the constellation-mapped signals may be allocated to one data tone having the next lower frequency of the second RU.

When the constellation-mapped signals are allocated to all data tones of the first RU, the remaining tenth signals among the constellation-mapped signals may be sequentially allocated to the remaining data tones of the second RU.

That is, the sixth to tenth signals may be parsed for the Multi-RU by the constellation-mapped signal parser and allocated to a data tone. The sixth to tenth signals are not allocated to a pilot tone in the Multi-RU.

The constellation-mapped signal may be parsed according to a proportional ratio in a round robin scheme. The variable s related to the proportionality ratio can be defined as follows.

S= max(1, N _BPSCS /2)

In this case, N _BPSCS means the number of coded bits per subcarrier per spatial stream (Number of coded bits per subcarrier per spatial stream). The coded bit may be determined by a Modulation and Coding Scheme (MCS) value.

The PPDU may further include a control field. The control field may include a U-SIG (Universal-Signal) field and an EHT-SIG field. The control field includes allocation information for the Multi-RU, and the allocation information for the Multi-RU receives the size and location of the RU, control information related to the RU, information on a frequency band including the RU, and the RU. It may include information on the STA to be performed.

In addition, the PPDU may include a Legacy-Signal (L-SIG) field, a Repeated Legacy-Signal (RL-SIG) field, a Short Training Field (EHT-STF), and a Long Training Field (EHT-LTF). The EHT-SIG field may include an EHT-SIG-A field and an EHT-SIG-B field. The EHT-SIG field may further include an EHT-SIG-C field.

The example of FIG. 25 may be performed in a network environment in which a next-generation wireless LAN system (IEEE 802.11be or EHT wireless LAN system) is supported. The next-generation wireless LAN system is a wireless LAN system that is an improved 802.11ax system and may satisfy backward compatibility with the 802.11ax system.

The example of FIG. 25 is performed by a receiving STA and may correspond to an STA supporting an Extremely High Throughput (EHT) WLAN system. The transmitting STA of FIG. 25 may correspond to an access point (AP).

In step S2510, the receiving STA (station) receives a PPDU (Physical Protocol Data Unit) including a data field from the transmitting STA.

In step S2520, the receiving STA decodes the data field.

However, since the receiving STA performs decoding of the data field, the procedures 1) to 6) may be reversed. The STA receiving the data field from the transmitting device 7) performs constellation demapping to obtain a bit stream again from the modulation symbol, and 8) does not map the bit stream for each spatial stream through a stream deparser, 9) LDPC decoding may be performed, 10) a descrambling operation may be performed, and 11) Pre-FEC padding or Post-FEC padding may be performed. The receiving STA may decode the bit stream (input bit stream) through the procedures 7) to 11).

C is defined as follows.

c=floor(a/b)

D is defined as follows.

d=ceil(a/b)

S= max(1, N _BPSCS /2)

5. 장치 구성5. Device configuration

Each device/STA of the sub-drawings (a)/(b) of FIG. 1 may be modified as shown in FIG. 26. The transceiver 630 of FIG. 26 may be the same as the

transceivers

113 and 123 of FIG. 1. The transceiver 630 of FIG. 26 may include a receiver and a transmitter.

The processor 610 of FIG. 26 may be the same as the

processors

111 and 121 of FIG. 1. Alternatively, the processor 610 of FIG. 26 may be the same as the

processing chips

114 and 124 of FIG. 1.

The memory 150 of FIG. 26 may be the same as the

memories

112 and 122 of FIG. 1. Alternatively, the memory 150 of FIG. 26 may be a separate external memory different from the

memories

112 and 122 of FIG. 1.

Referring to FIG. 26, the power management module 611 manages power for the processor 610 and/or the transceiver 630. The battery 612 supplies power to the power management module 611. The display 613 outputs a result processed by the processor 610. Keypad 614 receives input to be used by processor 610. The keypad 614 may be displayed on the display 613. The SIM card 615 may be an integrated circuit used to securely store an IMSI (international mobile subscriber identity) used to identify and authenticate a subscriber in a mobile phone device such as a mobile phone and a computer and a key associated therewith. .

Referring to FIG. 26, the speaker 640 may output a sound related result processed by the processor 610. The microphone 641 may receive a sound-related input to be used by the processor 610.

The technical features of the present specification described above can be applied to various devices and methods. For example, the technical features of the present specification described above may be performed/supported through the apparatus of FIGS. 1 and/or 26. For example, the technical features of the present specification described above may be applied only to a part of FIGS. 1 and/or 26. For example, the technical features of the present specification described above may be implemented based on the

processing chips

114 and 124 of FIG. 1, or implemented based on the

processors

111 and 121 and the

memories

112 and 122 of FIG. 1. , May be implemented based on the processor 610 and the memory 620 of FIG. 26. For example, the apparatus of the present specification receives a PPDU (Physical Protocol Data Unit) including a data field from a transmitting STA; And decode the data field.

C is defined as follows.

c=floor(a/b)

For example, when a=20 and b=3, c=6. The first 6 signals among the constellation-mapped signals may be allocated to the lowest 6 data tones of the first RU. The next one (7th) signal among the constellation-mapped signals may be allocated to the lowest one data tone of the second RU. The next six (8th to 13th) signals among the constellation-mapped signals may be allocated to the next lower six data tones of the first RU. The next one (14th) signal among the constellation-mapped signals may be allocated to the next lower one data tone of the second RU. The next six (15th to 20th) signals of the constellation-mapped signals may be allocated to the next lower six data tones of the first RU. The next one (21st) signal among the constellation-mapped signals may be allocated to the next lower one data tone of the second RU. Accordingly, all of the constellation-mapped signals may be allocated to the data tone of the second RU. Accordingly, the remaining (unallocated) two constellation-mapped signals among the constellation-mapped signals may be allocated to the remaining two data tones of the first RU.

D is defined as follows.

d=ceil(a/b)

S= max(1, N _BPSCS /2)

Technical features of the present specification may be implemented based on a computer readable medium (CRM). For example, CRM proposed by the present specification is at least one computer readable medium containing instructions based on execution by at least one processor.

The CRM, the step of receiving a PPDU (Physical Protocol Data Unit) including a data field from the transmitting STA; And it is possible to store instructions for performing operations including decoding the data field. Instructions stored in the CRM of the present specification may be executed by at least one processor. At least one processor related to the CRM of the present specification may be the

processors

111 and 121 of FIG. 1 or the

processing chips

114 and 124 of FIG. 1, or the processor 610 of FIG. 26. Meanwhile, the CRM of the present specification may be the

memories

112 and 122 of FIG. 1, the memory 620 of FIG. 26, or a separate external memory/storage medium/disk.

C is defined as follows.

c=floor(a/b)

For example, when a=20 and b=3, c=6. The first 6 signals among the constellation-mapped signals may be allocated to the lowest 6 data tones of the first RU. The next one (7th) signal among the constellation-mapped signals may be allocated to the lowest one data tone of the second RU. The next six (8th to 13th) signals among the constellation-mapped signals may be allocated to the next lower six data tones of the first RU. The next one (14th) signal among the constellation-mapped signals may be allocated to the next lower one data tone of the second RU. The next six (15th to 20th) signals among the constellation-mapped signals may be allocated to the next lower six data tones of the first RU. The next one (21st) signal among the constellation-mapped signals may be allocated to the next lower one data tone of the second RU. Accordingly, all of the constellation-mapped signals may be allocated to the data tone of the second RU. Accordingly, the remaining (unallocated) two constellation-mapped signals among the constellation-mapped signals may be allocated to the remaining two data tones of the first RU.

D is defined as follows.

d=ceil(a/b)

S= max(1, N _BPSCS /2)

The technical features of the present specification described above can be applied to various applications or business models. For example, for wireless communication in a device supporting artificial intelligence (AI), the above-described technical features may be applied.

Artificial intelligence refers to the field of researching artificial intelligence or the methodology that can create it, and machine learning (Machine Learning) refers to the field of studying methodologies to define and solve various problems dealt with in the field of artificial intelligence do. Machine learning is also defined as an algorithm that improves the performance of a task through continuous experience.

An artificial neural network (ANN) is a model used in machine learning, and may refer to an overall model with problem-solving capability, which is composed of artificial neurons (nodes) that form a network by combining synapses. The artificial neural network may be defined by a connection pattern between neurons of different layers, a learning process for updating model parameters, and an activation function for generating an output value.

The artificial neural network may include an input layer, an output layer, and optionally one or more hidden layers. Each layer includes one or more neurons, and the artificial neural network may include neurons and synapses connecting neurons. In an artificial neural network, each neuron can output a function of an activation function for input signals, weights, and biases input through synapses.

Model parameters refer to parameters determined through learning, and include weights of synaptic connections and biases of neurons. In addition, hyperparameters refer to parameters that must be set before learning in a machine learning algorithm, and include a learning rate, iteration count, mini-batch size, and initialization function.

The purpose of learning artificial neural networks can be seen as determining model parameters that minimize the loss function. The loss function can be used as an index to determine an optimal model parameter in the learning process of the artificial neural network.

Machine learning can be classified into supervised learning, unsupervised learning, and reinforcement learning according to the learning method.

Supervised learning refers to a method of training an artificial neural network when a label for training data is given, and a label indicates the correct answer (or result value) that the artificial neural network should infer when training data is input to the artificial neural network. It can mean. Unsupervised learning may refer to a method of training an artificial neural network in a state where a label for training data is not given. Reinforcement learning may mean a learning method in which an agent defined in a certain environment learns to select an action or action sequence that maximizes the cumulative reward in each state.

Among artificial neural networks, machine learning implemented as a deep neural network (DNN) including a plurality of hidden layers is sometimes referred to as deep learning (deep learning), and deep learning is a part of machine learning. Hereinafter, machine learning is used in the sense including deep learning.

In addition, the above-described technical features can be applied to wireless communication of a robot.

A robot may refer to a machine that automatically processes or operates a task given by its own capabilities. In particular, a robot having a function of recognizing the environment and performing an operation by self-determining may be referred to as an intelligent robot.

Robots can be classified into industrial, medical, household, military, etc. depending on the purpose or field of use. The robot may be provided with a driving unit including an actuator or a motor to perform various physical operations such as moving a robot joint. In addition, the movable robot includes a wheel, a brake, a propeller, etc. in a driving unit, and can travel on the ground or fly in the air through the driving unit.

In addition, the above-described technical features may be applied to a device supporting extended reality.

The extended reality collectively refers to Virtual Reality (VR), Augmented Reality (AR), and Mixed Reality (MR). VR technology provides only CG images of real world objects or backgrounds, AR technology provides virtually created CG images on top of real object images, and MR technology is a computer that mixes and combines virtual objects in the real world. It is a graphic technology.

MR technology is similar to AR technology in that it shows real and virtual objects together. However, in AR technology, virtual objects are used in a form that complements real objects, whereas in MR technology, virtual objects and real objects are used with equal characteristics.

XR technology can be applied to HMD (Head-Mount Display), HUD (Head-Up Display), mobile phones, tablet PCs, laptops, desktops, TVs, digital signage, etc., and devices applied with XR technology are XR devices. It can be called as.

The claims set forth herein may be combined in a variety of ways. For example, the technical features of the method claims of the present specification may be combined to be implemented as a device, and the technical features of the device claims of the present specification may be combined to be implemented by a method. In addition, the technical characteristics of the method claim of the present specification and the technical characteristics of the device claim may be combined to be implemented as a device, and the technical characteristics of the method claim of the present specification and the technical characteristics of the device claim may be combined to be implemented by a method.

Claims

In a wireless LAN system,

Receiving, by a receiving STA (station), a Physical Protocol Data Unit (PPDU) including a data field from the transmitting STA; And

Including, by the receiving STA, decoding the data field,

The data field is received through a multiple-resource unit (RU) in which a first resource unit (RU) and a second RU are aggregated,

A constellation mapped signal is allocated to the data tone of the data field,

The data tone includes a first data tone of the first RU and a second data tone of the second RU,

The first c first signals among the constellation-mapped signals are allocated to c data tones having the lowest frequency of the first RU,

One second signal following the first signal among the constellation-mapped signals is allocated to one data tone having the lowest frequency of the second RU,

C is defined as follows,

c=floor(a/b),

a is the number of the first data tones,

b is the number of the second data tones,

a is greater than b, and

floor is a descending function

Way.
The method of claim 1,

Of the constellation-mapped signals, c third signals following the second signal are allocated to c data tones having the next lower frequency of the first RU,

One fourth signal following the third signal among the constellation-mapped signals is assigned to one data tone having the next lower frequency of the second RU,

When the constellation-mapped signal is allocated to all data tones of the second RU, the remaining fifth signal among the constellation-mapped signals is sequentially allocated to the remaining data tones of the first RU.

Way.
The method of claim 2,

The data field is generated based on a bit stream,

The constellation-mapped signal is a modulation symbol obtained by performing constellation mapping on the bit stream.

Way.
The method of claim 3,

The constellation-mapped signal is divided into the first to fifth signals by a constellation mapped signal parser.

Way.
The method of claim 4,

The first to fifth signals are not allocated to a pilot tone in the Multi-RU.

Way.
The method of claim 1,

The PPDU further includes a control field,

The control field includes allocation information for the Multi-RU

Way.
In the wireless LAN system, the receiving STA (station) is

Memory;

Transceiver; And

A processor operatively coupled with the memory and the transceiver, the processor comprising:

Receiving a PPDU (Physical Protocol Data Unit) including a data field from the transmitting STA; And

Decrypt the data field,

The data field is received through a multiple-resource unit (RU) in which a first resource unit (RU) and a second RU are aggregated,

A constellation mapped signal is allocated to the data tone of the data field,

The data tone includes a first data tone of the first RU and a second data tone of the second RU,

The first c first signals among the constellation-mapped signals are allocated to c data tones having the lowest frequency of the first RU,

One second signal following the first signal among the constellation-mapped signals is allocated to one data tone having the lowest frequency of the second RU,

C is defined as follows,

c=floor(a/b),

a is the number of the first data tones,

b is the number of the second data tones,

a is greater than b, and

floor is a descending function

Receiving STA
In a wireless LAN system,

Generating, by a transmitting STA (station), a Physical Protocol Data Unit (PPDU) including a data field; And

Including the step of the transmitting STA, transmitting the PPDU to the receiving STA,

The data field is received through a multiple-resource unit (RU) in which a first resource unit (RU) and a second RU are aggregated,

A constellation mapped signal is allocated to the data tone of the data field,

The data tone includes a first data tone of the first RU and a second data tone of the second RU,

The first c first signals among the constellation-mapped signals are allocated to c data tones having the lowest frequency of the first RU,

One second signal following the first signal among the constellation-mapped signals is allocated to one data tone having the lowest frequency of the second RU,

C is defined as follows,

c=floor(a/b),

a is the number of the first data tones,

b is the number of the second data tones,

a is greater than b, and

floor is a descending function

Way.
The method of claim 8,

Of the constellation-mapped signals, c third signals following the second signal are allocated to c data tones having the next lower frequency of the first RU,

One fourth signal following the third signal among the constellation-mapped signals is assigned to one data tone having the next lower frequency of the second RU,

When the constellation-mapped signal is allocated to all data tones of the second RU, the remaining fifth signal among the constellation-mapped signals is sequentially allocated to the remaining data tones of the first RU.

Way.
The method of claim 9,

The data field is generated based on a bit stream,

The constellation-mapped signal is a modulation symbol obtained by performing constellation mapping on the bit stream.

Way.
The method of claim 10,

The constellation-mapped signal is divided into the first to fifth signals by a constellation mapped signal parser.

Way.
The method of claim 11,

The first to fifth signals are not allocated to a pilot tone in the Multi-RU.

Way.
The method of claim 8,

The PPDU further includes a control field,

The control field includes allocation information for the Multi-RU

Way.
In a wireless LAN system, a transmitting STA (station),

Memory;

Transceiver; And

A processor operatively coupled with the memory and the transceiver, the processor comprising:

Generating a PPDU (Physical Protocol Data Unit) including a data field; And

Transmitting the PPDU to the receiving STA,

The data field is received through a multiple-resource unit (RU) in which a first resource unit (RU) and a second RU are aggregated,

A constellation mapped signal is allocated to the data tone of the data field,

The data tone includes a first data tone of the first RU and a second data tone of the second RU,

The first c first signals among the constellation-mapped signals are allocated to c data tones having the lowest frequency of the first RU,

One second signal following the first signal among the constellation-mapped signals is allocated to one data tone having the lowest frequency of the second RU,

C is defined as follows,

c=floor(a/b),

a is the number of the first data tones,

b is the number of the second data tones,

a is greater than b, and

floor is a descending function

Sending STA.
In the at least one computer readable recording medium (computer readable medium) comprising an instruction (instruction) based on execution by at least one processor (processor),

Receiving a Physical Protocol Data Unit (PPDU) including a data field from a transmitting STA; And

Including the step of decoding the data field,

The data field is received through a multiple-resource unit (RU) in which a first resource unit (RU) and a second RU are aggregated,

A constellation mapped signal is allocated to the data tone of the data field,

The data tone includes a first data tone of the first RU and a second data tone of the second RU,

The first c first signals among the constellation-mapped signals are allocated to c data tones having the lowest frequency of the first RU,

One second signal following the first signal among the constellation-mapped signals is allocated to one data tone having the lowest frequency of the second RU,

C is defined as follows,

c=floor(a/b),

a is the number of the first data tones,

b is the number of the second data tones,

a is greater than b, and

floor is a descending function

Recording medium.
In the device in the wireless LAN system,

Memory; And

A processor operatively coupled with the memory, wherein the processor:

Receiving a PPDU (Physical Protocol Data Unit) including a data field from the transmitting STA; And

Decrypt the data field,

The data field is received through a multiple-resource unit (RU) in which a first resource unit (RU) and a second RU are aggregated,

A constellation mapped signal is allocated to the data tone of the data field,

The data tone includes a first data tone of the first RU and a second data tone of the second RU,

The first c first signals among the constellation-mapped signals are allocated to c data tones having the lowest frequency of the first RU,

One second signal following the first signal among the constellation-mapped signals is allocated to one data tone having the lowest frequency of the second RU,

C is defined as follows,

c=floor(a/b),

a is the number of the first data tones,

b is the number of the second data tones,

a is greater than b, and

floor is a descending function

Device.