WO2022059974A1

WO2022059974A1 - Method and device for configuring space reuse field in wireless lan system

Info

Publication number: WO2022059974A1
Application number: PCT/KR2021/011798
Authority: WO
Inventors: 박은성; 천진영; 최진수; 임동국
Original assignee: 엘지전자 주식회사
Priority date: 2020-09-16
Filing date: 2021-09-02
Publication date: 2022-03-24

Abstract

A method and a device for configuring a space reuse field in a wireless LAN system are presented. Particularly, a reception STA receives a trigger frame from a transmission STA through the preset frequency band. The reception STA transmits a TB PPDU to the transmission STA. The trigger frame includes first to fourth space reuse fields. The TB PPDU includes fifth and sixth space reuse fields.

Description

Method and apparatus for configuring a space reuse field in a WLAN system

This specification relates to a technique for configuring a spatial reuse field in a wireless LAN system, and more particularly, to a method and apparatus for configuring a trigger frame and a TB PPDU supporting spatial reuse in two wireless LAN systems.

A wireless local area network (WLAN) 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) specification that is being discussed recently. The EHT standard may use a newly proposed increased bandwidth, an improved PHY layer protocol data unit (PPDU) structure, an improved sequence, a hybrid automatic repeat request (HARQ) technique, and the like. The EHT standard may be referred to as an IEEE 802.11be standard.

An increased number of spatial streams may be used in the new wireless LAN standard. 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 configuring a trigger frame and TB PPDU supporting space reuse in a WLAN system.

An example of the present specification proposes a method of configuring a trigger frame and a TB PPDU supporting spatial reuse.

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 improved from the 802.11ax system, and may satisfy backward compatibility with the 802.11ax system.

This embodiment is performed in a receiving STA (station), and the receiving STA may correspond to a non-AP STA. The transmitting STA of this embodiment may correspond to an access point (AP) STA.

This embodiment proposes a method of configuring a trigger frame and a TB PPDU (or TB APPDU) that simultaneously support spatial reuse of an 802.11ax wireless LAN system and an 802.11be wireless LAN system.

A receiving STA (station) receives a trigger frame from a transmitting STA through a preset frequency band.

The receiving STA transmits a TB Trigger Based Physical Protocol Data Unit (TB PPDU) to the transmitting STA.

The trigger frame includes first to fourth spatial reuse fields.

The TB PPDU includes fifth and sixth spatial reuse fields.

When the preset frequency band is a 40 MHz band, the first and third spatial reuse fields include spatial reuse values of a first 20 MHz subchannel having a low frequency in the 40 MHz band. The second and fourth spatial reuse fields include spatial reuse values of a second 20MHz subchannel having a high frequency in the 40MHz band.

In this case, the spatial reuse value of the first 20 MHz subchannel is a value used to calculate transmission power that can allow access of an overlapping basic service set (OBSS) STA for the first 20 MHz subchannel, and the second The spatial reuse value of the 20 MHz subchannel may be a value used to calculate transmit power that can allow an OBSS STA to access the second 20 MHz subchannel.

The fifth spatial reuse field is constructed by duplicating the first spatial reuse field. The sixth spatial reuse field is constructed by duplicating the second spatial reuse field. That is, the spatial reuse field included in the TB PPDU may use the value of the spatial reuse field included in the trigger frame as it is.

According to the embodiment proposed in this specification, the transmitting STA informs the OBSS STA of an allowable transmit power value (or an interference-free transmit power value) for a specific band (or a specific channel) through a spatial reuse value, The OBSS STA may perform spatial reuse in the specific band (or specific channel) to calculate and adjust transmission power to transmit a signal. When the OBSS STA adjusts the transmit power, the transmitting STA may not receive interference due to the OBSS STA when receiving the TB PPDU. That is, the present embodiment has an effect that transmission resources for a specific band can be used stably without collision.

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

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

3 is a view for explaining a general link setup process.

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

5 is a diagram illustrating an arrangement of a resource unit (RU) used on a 20 MHz band.

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

7 is a diagram illustrating an arrangement of resource units (RUs) used on an 80 MHz 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 technique.

10 shows an example of a PPDU used in this specification.

11 shows a modified example of a transmitting apparatus and/or a receiving apparatus of the present specification.

12 is a diagram showing the effect of increasing and decreasing transmit power and sensitivity in WLAN.

13 is an example illustrating a CS area in a wireless LAN system.

14 is a graph illustrating an adjustment rule for OBSS/PD and transmit power.

15 shows an operation according to UL-MU.

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

17 shows another example of a common information field of a trigger frame.

18 shows the format of a UL Spatial Reuse subfield.

19 shows an example of a Special User Info field format.

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

21 shows an example in which a TB A-PPDU is transmitted.

22 is a flowchart illustrating the operation of the transmitting apparatus according to the present embodiment.

23 is a flowchart illustrating the operation of the receiving apparatus according to the present embodiment.

24 is a flowchart illustrating a procedure for an AP to configure a trigger frame and a TB PPDU supporting spatial reuse according to the present embodiment.

25 is a flowchart illustrating a procedure for an STA to configure a trigger frame and a TB PPDU supporting spatial reuse according to the present embodiment.

In this 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, “A, B or C (A, B or C)” herein means “only A,” “only B,” “only C,” or “any and any combination of A, B and C. combination of A, B and C)”.

A slash (/) or a comma (comma) used herein 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”.

As used herein, “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”.

Also, in this specification, “at least one of A, B and C” means “only A”, “only B”, “only C” or “of A, B and C”. any combination of A, B and C”. Also, “at least one of A, B or C” or “at least one of A, B and/or C” means may mean “at least one of A, B and C”.

In addition, parentheses used herein 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 proposed as an example of “control information”. Also, even when displayed as “control information (ie, EHT-signal)”, “EHT-Signal” may be proposed as an example of “control information”.

In this specification, technical features that are individually described within one drawing may be implemented individually or simultaneously.

The following examples of the present specification may 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, the present specification may be applied to the IEEE 802.11a/g/n/ac standard or the IEEE 802.11ax standard. In addition, this specification may 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 a new wireless LAN standard that is an enhancement of IEEE 802.11be. Also, an example of the present specification may be applied to a mobile communication system. For example, it may be applied to a mobile communication system based on Long Term Evolution (LTE) based on the 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 the 5G NR standard based on the 3GPP standard.

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

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

STAs

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

STAs

110 and 120 in 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. In the present specification, the

STAs

110 and 120 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 this 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. For example, a communication standard (eg, LTE, LTE-A, 5G NR standard) according to the 3GPP standard may be supported. In addition, the STA of the present specification may be implemented in 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 this specification, the

STAs

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

The

STAs

110 and 120 will be described based on the sub-view (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 one 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.) may be transmitted/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 the 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 to be transmitted through the transceiver (ie, a transmission signal).

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

For example, the processor 121 of the non-AP STA may receive a signal through the transceiver 123 , process the 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 received signal) received through the transceiver 123 and may store a signal to be transmitted through the transceiver (ie, a transmission signal).

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

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

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

STAs

110 and 120 of FIG. 1 . For example, without specific reference numerals (transmitting/receiving) STA, first STA, second STA, STA1, STA2, AP, first AP, second AP, AP1, AP2, (transmitting/receiving) Terminal, (transmitting) A device indicated by a /receiver) device, a (transmit/receive) apparatus, and a network may also refer to 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, the operations of the various STAs generating transmission/reception signals or performing data processing or calculation in advance for the 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 operation in advance for a transmission/reception signal is 1) Determining bit information of a subfield (SIG, STF, LTF, Data) field included in a PPDU /Acquisition/configuration/computation/decoding/encoding operation, 2) time resource or frequency resource (eg, subcarrier resource) used for the subfield (SIG, STF, LTF, Data) field included in the PPDU, etc. operation of determining / configuring / obtaining, 3) a specific sequence (eg, pilot sequence, STF / LTF sequence, SIG) used for the subfield (SIG, STF, LTF, Data) field included in the PPDU operation of determining / configuring / acquiring an extra sequence), etc., 4) a power control operation and / or a power saving operation applied to the STA, 5) an operation related to determination / acquisition / configuration / operation / decoding / encoding of an ACK signal may include In addition, in the following example, various information (eg, field/subfield/control field/parameter/power related information) used by various STAs for determination/acquisition/configuration/computation/decoding/encoding of transmit/receive signals is may be stored in the memories 112 and 122 of FIG. 1 .

The device/STA of the sub-view (a) of FIG. 1 described above may be modified as shown in the sub-view (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 (b) of FIG. 1 may perform the same function as the transceivers illustrated in (a) of FIG. 1 . For example, the

processing chips

114 and 124 illustrated in (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 (b) of FIG. 1 are the

processors

111 and 121 and the

memories

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

As described below, a mobile terminal, a wireless device, a wireless transmit/receive unit (WTRU), a user equipment (UE), a mobile station (MS), a mobile Mobile Subscriber Unit, user, user STA, network, base station, Node-B, access point (AP), repeater, router, relay, receiving device, transmitting device, receiving STA, transmitting STA, Receiving Device, Transmitting Device, Receiving Apparatus, and/or Transmitting Apparatus means the

STAs

110 and 120 shown in the sub-drawings (a)/(b) of FIG. ) may mean the

processing chips

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

STAs

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

processors

111 and 121 shown in the sub-drawings (a)/(b) of FIG. 1 are (a) of FIG. ) / (b) 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 the sub-view (b) of FIG. can be understood

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

transceivers

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

transceivers

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

Referring to (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 .

Software code

115, 125 may be included in a variety of programming languages.

The

processors

111 and 121 or the

processing chips

114 and 124 shown in FIG. 1 may include an application-specific integrated circuit (ASIC), other chipsets, logic circuits, and/or data processing devices. The processor may be an application processor (AP). For example, the

processors

111 and 121 or the

processing chips

114 and 124 illustrated in FIG. 1 may include a digital signal processor (DSP), a central processing unit (CPU), a graphics processing unit (GPU), and a modem (Modem). and demodulator). For example, the

processors

111 and 121 or the

processing chips

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

In this 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, 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 illustrating the structure of a wireless LAN (WLAN).

The upper part of FIG. 2 shows the structure of an infrastructure basic service set (BSS) of the Institute of Electrical and Electronic Engineers (IEEE) 802.11.

Referring to the upper part of FIG. 2 , a wireless LAN system may include one or more infrastructure BSSs 200 and 205 (hereinafter, BSSs). The

BSSs

200 and 205 are a set of APs and STAs such as an access point (AP) 225 and a station 200-1 (STA1) that can communicate with each other through successful synchronization, and are not a concept indicating a specific area. The BSS 205 may include one or more combinable STAs 205 - 1 and 205 - 2 to one AP 230 .

The BSS may include at least one STA, the

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 that is an extended service set by connecting

several BSSs

200 and 205 . The ESS 240 may be used as a term indicating one network in which one or several APs are connected 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 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 establish a network and perform communication even between STAs without the

APs

225 and 230 . A network that establishes a network and performs communication 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 illustrating the IBSS.

Referring to the lower part of FIG. 2 , the IBSS is a BSS operating in an ad-hoc mode. Since IBSS does not include an AP, there is no centralized management entity that performs a centralized management function. 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 mobile STAs, and access to a distributed system is not allowed, so a self-contained network network) is formed.

3 is a view for explaining 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 is necessary to find a network in which it can participate. An STA must identify a compatible network before participating in a 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 exemplarily illustrates a network discovery operation including an active scanning process. In active scanning, an STA performing scanning transmits a probe request frame to discover which APs exist nearby while moving channels, and waits for a response. A responder transmits a probe response frame to the STA that has transmitted the probe request frame in response to 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 the BSS, since the AP transmits a beacon frame, the AP becomes the responder. In the IBSS, the STAs in the IBSS rotate and transmit the beacon frame, so 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 channel) to perform scanning (ie, probe request/response transmission/reception on channel 2) in the same way.

Although not shown in the example of FIG. 3 , the scanning operation may be performed in a passive scanning manner. 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 to inform the existence of a wireless network, and to allow a scanning STA to search for a wireless network and participate in the wireless network. In the BSS, the AP plays a role of periodically transmitting a beacon frame, and in the IBSS, the STAs in the IBSS rotate and transmit the beacon frame. When the STA performing scanning receives the beacon frame, it stores information on the BSS included in the beacon frame and records beacon frame information in each channel while moving to another channel. Upon receiving the beacon frame, the STA may store BSS-related information included in the received beacon frame, move to the next channel, and perform scanning on the next channel in the same manner.

The STA discovering 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 an authentication request/response corresponds to a management frame.

The authentication frame includes an authentication algorithm number, an authentication transaction sequence number, a status code, a challenge text, a Robust Security Network (RSN), and a Finite Cyclic Group), etc. may 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 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 successfully authenticated STA 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, the AP transmits an association response frame to the STA. For example, the connection request frame includes information related to various capabilities, a beacon listening interval, a service set identifier (SSID), supported rates, supported channels, RSN, and a mobility domain. , supported operating classes, TIM broadcast request (Traffic Indication Map Broadcast request), may include information on interworking service capability, and the like. 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 Indicator (RCPI), Received Signal to Noise (RSNI). indicator), mobility domain, timeout interval (association comeback time), overlapping BSS scan parameters, TIM broadcast response, QoS map, and the like.

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 private key setup through 4-way handshaking through an Extensible Authentication Protocol over LAN (EAPOL) frame. .

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

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

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 may be included only for multiple users, and the corresponding HE-SIG-B may be omitted from the PPDU for a single user.

As shown, HE-PPDU for multiple users (Multiple User; 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 interval (ie, 4 or 8 μs, etc.).

Hereinafter, a resource unit (RU) used in the PPDU will be described. A resource unit may include a plurality of subcarriers (or tones). The resource unit may be used when transmitting a signal to a plurality of 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 may be used for STF, LTF, data field, 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 RUs 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 deployed. Six tones may be used as a guard band in the leftmost band of the 20 MHz band, and five tones may be used as a guard band in the rightmost band of the 20 MHz band. In addition, 7 DC tones are inserted into the center band, that is, the DC band, and 26-units corresponding to each of 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 may be assigned for a receiving station, ie a user.

On the other hand, 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), and in this case, as shown at 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, ie, 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).

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

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

As in the example of FIGS. 5 and 6, RUs of various sizes are used, in the example of FIG. 7, 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, 996-RU, etc. may be used. there is. In addition, 7 DC tones can be inserted into the center frequency, 12 tones are used as a guard band in the leftmost band of the 80MHz band, and 11 tones are used in the rightmost band of the 80MHz band. This can be used as a guard band. In addition, 26-RU using 13 tones located on the left and right of the DC band can be used.

Also, as shown, when used for a single user, 996-RU may be used, and in this case, 5 DC tones may be inserted.

The RU described in this specification may be used for uplink (UL) communication and downlink (DL) communication. For example, when UL-MU communication solicited by a Trigger frame is performed, a transmitting STA (eg, AP) provides a first RU (eg, 26/52/106) to the first STA through a 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 PPDUs are transmitted to the AP in the same time interval.

For example, when the 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 A second RU (eg, 26/52/106/242-RU, etc.) may be allocated to the 2 STAs. 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 through the second RU. HE-STF, HE-LTF, and Data fields for 2 STAs may 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 SIG-B. The user-individual field 830 may be referred to as a user-individual control field. The user-individual field 830 may be applied only to some of the plurality of users when the SIG-B is delivered to a 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 about 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 RUs (26-RU/52-RU/106-RU) are disposed in which frequency band. .

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

As in the example of FIG. 5 , a maximum of nine 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 to '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 to '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 thereof.

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

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

“01000y2y1y0” relates to an example in which 106-RU is allocated to the leftmost side of a 20 MHz channel, and 5 26-RUs are allocated to the right side thereof. In this case, a plurality of STAs (eg, User-STAs) may be allocated to the 106-RU based on the MU-MIMO technique. Specifically, a maximum of 8 STAs (eg, User-STAs) may be allocated to the 106-RU, and the number of STAs (eg, User-STAs) allocated to the 106-RU is 3-bit information (y2y1y0). ) is determined based on For example, when 3-bit information (y2y1y0) is set to N, the number of STAs (eg, User-STAs) allocated to the 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, a plurality of STAs (eg, user STAs) may be allocated to one RU having a specific size (eg, 106 subcarriers) or more 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 of 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 the nine 26-RUs (that is, a total of nine user STAs are allocated). That is, up to 9 user STAs may be allocated to a specific channel through the OFDMA technique. In other words, up to 9 user STAs may be allocated to a specific channel through the non-MU-MIMO technique.

For example, if the RU allocation is set to “01000y2y1y0”, a plurality of user STAs are allocated to the 106-RU disposed on the leftmost side through the MU-MIMO technique, and five 26-RUs disposed on the right side have Five user STAs may be allocated through the non-MU-MIMO technique. This case is embodied through an example of FIG. 9 .

For example, when RU allocation is set to “01000010” as shown in FIG. 9, based on Table 2, 106-RU is allocated to the leftmost side of a specific channel, and 5 26-RUs are allocated to the right side. can In addition, a total of three user STAs may be allocated to the 106-RU through the MU-MIMO technique. 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 . Also, 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, the user field related to the MU-MIMO technique may be configured in the first format, and the user field related to the non-MU-MIMO technique may be configured in the 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 technique) may be configured as follows.

For example, the first bit (eg, B0-B10) in the user field (ie, 21 bits) is identification information of the user STA to which the corresponding user field is allocated (eg, STA-ID, partial AID, etc.) may include In addition, the second bit (eg, B11-B14) in the user field (ie, 21 bits) may include information about spatial configuration.

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

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

Also, the fourth bit (ie, B19) in the User field (ie, 21 bits) may be a Reserved field.

In addition, a fifth bit (ie, B20) in the user field (ie, 21 bits) may include information about a 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 technique). An example of the user field of the second format (the format of the non-MU-MIMO technique) 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 about 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 a beamforming steering matrix is applied. A fourth bit (eg, B15-B18) in the user field of the second format may include modulation and coding scheme (MCS) information. In addition, a fifth bit (eg, B19) in the user field of the second format may include information on whether Dual Carrier Modulation (DCM) is applied. In addition, the sixth bit (ie, B20) in the user field of the second format may include information about a coding type (eg, BCC or LDPC).

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

10 shows an example of a PPDU used in this specification.

The PPDU of FIG. 10 may be called by various names such as an EHT PPDU, a transmission PPDU, a reception PPDU, a first type or an Nth type PPDU. For example, in the present specification, a PPDU or an EHT PPDU may be referred to by various names such as a transmission PPDU, a reception PPDU, a first type or an Nth type PPDU. In addition, the EHT PPU may be used in an EHT system and/or a new wireless LAN system in which the EHT system is improved.

The PPDU of FIG. 10 may represent some or all of the PPDU types used in the EHT system. For example, the example of FIG. 10 may be used for both a single-user (SU) mode and a multi-user (MU) mode. In other words, the PPDU of FIG. 10 may be a PPDU for one receiving STA or a plurality of receiving STAs. When the PPDU of FIG. 10 is used for a trigger-based (TB) mode, the EHT-SIG of FIG. 10 may be omitted. In other words, the STA that has received the trigger frame for uplink-MU (UL-MU) communication may transmit a PPDU in which the EHT-SIG is omitted in the example of FIG. 10 .

In FIG. 10 , 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 a physical layer.

The subcarrier spacing of the L-STF, L-LTF, L-SIG, RL-SIG, U-SIG, and EHT-SIG fields of FIG. 10 is set to 312.5 kHz, and the subcarrier spacing of the EHT-STF, EHT-LTF, and Data fields may 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. 10, L-LTF and L-STF may be the same as the conventional fields.

The L-SIG field of FIG. 10 may include, for example, 24-bit bit information. For example, 24-bit information may include a 4-bit Rate field, a 1-bit Reserved bit, a 12-bit Length field, a 1-bit Parity bit, and a 6-bit Tail bit. For example, the 12-bit Length field may include information about 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 the PPDU. For example, when the PPDU is a non-HT, HT, VHT PPDU or an 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, the value of the Length field may be determined as “a multiple of + 1” or “a multiple of +2”. In other words, for non-HT, HT, VHT PPDUs or for EHT PPDUs, the value of the Length field may be determined as a multiple of 3, and for the HE PPDU, the value of the Length field may be “a multiple of 3 + 1” or a multiple of “+ 2” can be determined.

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 acquire a 48-bit BCC encoding bit. BPSK modulation may be applied to 48-bit coded bits to generate 48 BPSK symbols. The transmitting STA may map 48 BPSK symbols to positions excluding pilot subcarriers {subcarrier indexes -21, -7, +7, +21} and DC subcarriers {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. there is. The transmitting STA may additionally map signals of {-1, -1, -1, 1} to the subcarrier indexes {-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 way as the L-SIG. For RL-SIG, BPSK modulation is applied. The receiving STA may know that the received PPDU is an HE PPDU or an EHT PPDU based on the existence of the RL-SIG.

A U-SIG (Universal SIG) may be inserted after the RL-SIG of FIG. 10 . 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 information of N bits, and may include information for identifying the type of the 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 the U-SIG may be used to transmit 26-bit information. For example, each symbol of U-SIG may be transmitted/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 the 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 the remaining Y-bit information (eg, 26 un-coded bits) of the total A-bit information. there is. For example, the transmitting STA may obtain 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, except for DC index 0. The 52 BPSK symbols generated by the transmitting STA may be transmitted based on the remaining tones (subcarriers) excluding pilot tones -21, -7, +7, and +21 tones.

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

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, the version-independent bits may be allocated only to the first symbol of the U-SIG, or the version-independent bits may be allocated to both the first symbol and the second symbol of the U-SIG. For example, the version-independent bits and the 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 the 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 the 3-bit PHY version identifier to the first value. In other words, the receiving STA may determine that the receiving PPDU is an EHT PPDU based on the PHY version identifier having the first value.

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

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

For example, when the EHT PPDU is divided into various types (eg, various types such as EHT PPDU related to SU mode, EHT PPDU related to MU mode, EHT PPDU related to TB mode, EHT PPDU related to Extended Range transmission) , information on the type of the EHT PPDU may be included in the version-dependent bits of the U-SIG.

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

Preamble puncturing may be applied to the PPDU of FIG. 10 . Preamble puncturing refers to applying puncturing to some bands (eg, secondary 20 MHz band) among all bands of the PPDU. For example, when an 80 MHz PPDU is transmitted, the STA may apply puncturing to the secondary 20 MHz band among 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 the secondary 20 MHz band within the 80 MHz band. For example, when the second puncturing pattern is applied, puncturing may be applied only to any one of the 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. Puncture may be applied to at least one 20 MHz channel.

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

For example, U-SIG and EHT-SIG may include information about preamble puncturing based on the following method. When the bandwidth of the PPDU exceeds 80 MHz, the U-SIG may 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 the first 80 MHz band and a second U-SIG for the second 80 MHz band. In this case, the first field of the first U-SIG includes information about the 160 MHz bandwidth, and the second field of the first U-SIG includes information about the preamble puncturing applied to the first 80 MHz band (that is, the preamble information about the puncturing pattern). In addition, the first field of the second U-SIG includes information on 160 MHz bandwidth, and the second field of the second U-SIG includes information on preamble puncturing applied to the second 80 MHz band (ie, preamble puncture). information about processing patterns). On the other hand, the EHT-SIG subsequent to the first U-SIG may include information on preamble puncturing applied to the second 80 MHz band (that is, information on the preamble puncturing pattern), and in the second U-SIG The successive EHT-SIG may include information about preamble puncturing applied to the first 80 MHz band (ie, information about a preamble puncturing pattern).

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

The U-SIG may be configured in units of 20 MHz. For example, when an 80 MHz PPDU is configured, the U-SIG may be duplicated. That is, the same 4 U-SIGs may be included in the 80 MHz PPDU. PPDUs exceeding the 80 MHz bandwidth may include different U-SIGs.

The EHT-SIG of FIG. 10 may include control information for the receiving STA. The EHT-SIG may be transmitted through at least one symbol, and one symbol may have a length of 4 us. Information on the number of symbols used for the EHT-SIG may be included in the U-SIG.

The EHT-SIG may include technical features of the HE-SIG-B described with reference to FIGS. 8 to 9 . For example, the EHT-SIG may include a common field and a user-specific field, as in the example of FIG. 8 . The common field of the EHT-SIG may be omitted, and the number of user-individual fields may be determined based on the number of users.

As in the example of FIG. 8 , the common field of the EHT-SIG and the user-individual field of the EHT-SIG may be individually coded. One user block field included in the user-individual field may contain information for two users, but the last user block field included in the user-individual field is for one user. It is possible to include information. That is, one user block field of the EHT-SIG may include a maximum of two user fields (user fields). As in the example of FIG. 9 , each user field may be related to MU-MIMO assignment or may be related to non-MU-MIMO assignment.

As in the example of FIG. 8, the common field of EHT-SIG may include a CRC bit and a Tail bit, the length of the CRC bit may be determined as 4 bits, and the length of the Tail bit may be determined as 6 bits and set to '000000'. can be set.

As in the example of FIG. 8 , the common field of the EHT-SIG may include RU allocation information. The RU allocation information may refer to information about a location of an RU to which a plurality of users (ie, a plurality of receiving STAs) are allocated. As in Table 1, RU allocation information may be configured in units of 8 bits (or N bits).

A mode in which the common field of EHT-SIG is omitted may be supported. A mode in which the common field of EHT-SIG is omitted may be called a compressed mode. When compressed mode is used, a plurality of users (ie, a plurality of receiving STAs) of the EHT PPDU may decode the PPDU (eg, a data field of the PPDU) based on non-OFDMA. That is, a plurality of users of the EHT PPDU may decode a PPDU (eg, a data field of the PPDU) received through the same frequency band. On the other hand, when the non-compressed mode is used, a plurality of users of the EHT PPDU may decode the PPDU (eg, the data field of the PPDU) based on OFDMA. That is, a plurality of users of the EHT PPDU may receive the PPDU (eg, a data field of the PPDU) through different frequency bands.

The EHT-SIG may 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 may be configured based on the DCM technique. For example, among the N data tones (eg, 52 data tones) allocated for the EHT-SIG, a first modulation scheme is applied to a continuous half tone, and a second modulation scheme is applied to the remaining consecutive half tones. technique can be applied. That is, the transmitting STA modulates specific control information into a first symbol based on the first modulation scheme and allocates to consecutive half tones, modulates the same control information into a second symbol based on the second modulation scheme, and modulates the remaining consecutive tones. can be allocated to half the tone. As described above, information (eg, 1-bit field) related to whether the DCM technique is applied to the EHT-SIG may be included in the U-SIG. The EHT-STF of FIG. 10 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. 10 may be used to estimate a channel in a MIMO environment or an OFDMA environment.

Information on the type of STF and/or LTF (including information on GI applied to LTF) may be included in the SIG A field and/or the SIG B field of FIG. 10 .

The PPDU of FIG. 10 (ie, EHT-PPDU) may be configured based on the examples of FIGS. 5 and 6 .

For example, the EHT PPDU transmitted on the 20 MHz band, that is, the 20 MHz EHT PPDU may be configured based on the RU of FIG. 5 . That is, the location of the RU of the EHT-STF, EHT-LTF, and 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 RU of the EHT-STF, EHT-LTF, and data field included in the EHT PPDU may be determined as shown in FIG. 6 .

Since the RU location 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 instead of 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, the tone-plan for the 80 MHz EHT PPDU allocated based on OFDMA may have 23 DC tones. On the other hand, 80 MHz EHT PPDU (ie, non-OFDMA full bandwidth 80 MHz PPDU) allocated based on Non-OFDMA is configured based on 996 RUs and consists of 5 DC tones, 12 left guard tones, and 11 right guard tones. may include

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

The PPDU of FIG. 10 may be identified as an EHT PPDU based on the following method.

The receiving STA may determine the type of the receiving PPDU as an 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) the RL-SIG where the L-SIG of the received PPDU is repeated is detected, and 3) the L-SIG of the received PPDU is Length 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 it is determined that the received PPDU is an EHT PPDU, the receiving STA determines the type of the EHT PPDU (eg, SU/MU/Trigger-based/Extended Range type based on bit information included in the symbols after the RL-SIG of FIG. 10 ). ) can be detected. In other words, the receiving STA 1) the first symbol after the L-LTF signal that is BSPK, 2) the RL-SIG continuous to the L-SIG field and the same as the L-SIG, and 3) the result of applying “modulo 3” Based on the L-SIG including the Length field set to “0”, the received PPDU may be determined as the EHT PPDU.

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

In the example below, (transmit/receive/uplink/downlink) signals, (transmit/receive/uplink/downlink) frames, (transmit/receive/uplink/downlink) packets, (transmit/receive/uplink/downlink) data units, ( A signal indicated by transmission/reception/uplink/downlink) data, etc. may be a signal transmitted/received based on the PPDU of FIG. 10 . The PPDU of FIG. 10 may be used to transmit and receive various types of frames. For example, the PPDU of FIG. 10 may be used for a control frame. Examples of the control frame may include request to send (RTS), clear to send (CTS), Power Save-Poll (PS-Poll), BlockACKReq, BlockAck, Null Data Packet (NDP) announcement, and Trigger Frame. For example, the PPDU of FIG. 10 may be used for a management frame. An example of the 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. 10 may be used for a data frame. For example, the PPDU of FIG. 10 may be used to simultaneously transmit at least two or more of a control frame, a management frame, and a data frame.

Each device/STA of the sub-drawings (a)/(b) of FIG. 1 may be modified as shown in FIG. 11 . The transceiver 630 of FIG. 11 may be the same as the

transceivers

113 and 123 of FIG. 1 . The transceiver 630 of FIG. 11 may include a receiver and a transmitter.

The processor 610 of FIG. 11 may be the same as the

processors

111 and 121 of FIG. 1 . Alternatively, the processor 610 of FIG. 11 may be the same as the

processing chips

114 and 124 of FIG. 1 .

The memory 150 of FIG. 11 may be the same as the

memories

112 and 122 of FIG. 1 . Alternatively, the memory 150 of FIG. 11 may be a separate external memory different from the

memories

112 and 122 of FIG. 1 .

Referring to FIG. 11 , 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 the result processed by the processor 610 . Keypad 614 receives input to be used by processor 610 . A keypad 614 may be displayed on the display 613 . SIM card 615 may be an integrated circuit used to securely store an international mobile subscriber identity (IMSI) used to identify and authenticate subscribers in mobile phone devices, such as mobile phones and computers, and keys associated therewith. .

Referring to FIG. 11 , 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 .

1. SR(Spatial Reuse) 동작1. SR (Spatial Reuse) operation

In 802.11ax WLAN systems, SR operation is a way to improve spectral efficiency by increasing the number of parallel transmissions. Carrier Sense Threshold (CST) adjustment for interBSS transmission detected through SR operation may be performed. CST coordination is achieved through two mechanisms: i) Overlapping Basic Service Set Packet Detect (OBSS PD)-based SR, and ii) Parametrized Spatial Reuse (PSR).

The main difference between the two mechanisms is the degree of collaboration between BSSs to identify SR-based opportunities. Both mechanisms include Transmission Power Control (TPC), which limits the additional interference generated by simultaneous transmissions.

SR operation is introduced as a mechanism to increase the number of transmissions and spectral efficiency stored in the OBSS. In some cases, dynamic sensitivity and transmit power tuning have been shown to significantly improve network performance and contribute to reducing the impact of well-known hidden/exposed device issues. However, in some cases, modifying CST or transmit power may create flow starvation and asymmetry, exacerbating the hidden/exposed device problem.

12 is a diagram showing the effect of increasing and decreasing transmit power and sensitivity in WLAN. For example, increasing the sensitivity can contribute to more frequent access to the channel because the carrier sense (CS) area is reduced. However, this may lead to observing a larger number of collisions by hidden nodes. In addition, using a more aggressive channel access policy may expose the receiver to a higher level of interference, so a stronger MCS (Modulation and Coding Scheme) is required.

SR operation relies on dynamic Clear Channel Assessment/Carrier Sense (CCA/CS) coordination to increase the number of Transmission Opportunities (TXOPs) in OBSS. The CCA/CS mechanism is triggered on the Wi-Fi device when it detects the preamble of another device transmission. A detected transmission (beyond the threshold of physical sensitivity) may not be decoded properly if the received signal is poor. In contrast, for a decoded transmission that exceeds the CCA/CS threshold, a physical or virtual carrier sensing operation sets the medium in use. Also, the capture effect is used when detecting multiple signals, so you can stick to the strongest signal without experiencing packet collisions.

13 is an example illustrating a CS area in a wireless LAN system.

The aforementioned concept is illustrated in FIG. 13 . In FIG. 13 , AP _A in the center may detect a received signal higher than the receiver sensitivity of the antenna, but may only decode a signal greater than or equal to the CCA/CS threshold. In addition, since the transmission of AP _B can be ignored using the OBSS/PD threshold due to the 11ax SR operation, channel utilization is improved. In addition, in the case of a TXOP detected using the OBSS/PD threshold, a transmit power limit is applied. In FIG. 13 , the transmit power is fixed and all devices use the same frequency channel.

1.1 OBSS PD-based SR

When receiving a PPDU, the MAC layer of a specific device receives a notification from the PHY. At this time, the node examines the frame and determines whether the PPDU is an Intra-BSS frame or an Inter-BSS frame during various operations. By quickly identifying the source of an ongoing transmission, the HE STA can improve the probability of accessing the channel using the appropriate OBSS/PD value.

802.11ax defines a set of rules for limiting the OBSS/PD threshold, and the upper limit is as follows.

where OBSS/PD _min and OBSS/PD _max are -82 dBm and -62 dBm, respectively, reference power TX PWR _ref is 21 dBm or 25 dBm depending on the device capability, TX PWR is the antenna in dBm of the HE node that identifies the SR-based TXOP It means the transmit power from the connector.

14 is a graph illustrating an adjustment rule for OBSS/PD and transmit power.

In conjunction with sensitivity adjustment, SR operation includes transmit power limiting for all transmissions that occur as a result of a sensed SR TXOP (i.e., after ignoring a given inter-BSS frame via OBSS/PD-based SR operation). The maximum allowable transmit power (TX PWR _max ) is defined as:

The previous equation holds for OBSS/PD _max >= OBSS/PD > OBSS/PD _min . Otherwise, the maximum transmit power is not limited. By applying a power limit, the OBSS/PD value aims to reduce the impact of simultaneous transmission caused by SR.

Simply put, the higher the OBSS/PD threshold (more inter-BSS transmissions can be ignored), the lower the transmit power (less interference should be generated). The transmit power limit lasts until the end of the SR TXOP identified by the HE node, which starts when the backoff reaches zero. This period depends on the active transmission period used to detect the SR TXOP.

1.2 Parametrized Spatial Reuse (PSR)

PSR operation is defined as an alternative to OBSS/PD-based SR for TB transmission.

A node using the PSR opportunity identifies the PSR opportunity in the sensed TB transmission. On the other hand, the opportunist performs TB transmission and finds a transmission holder indicating support for PSR operation in the header of a TF (Trigger Frame). To identify PSR opportunities, the opportunist must check whether it can ignore the TB PPDU following a given TF packet.

To do so, the intended transmit power of the opportunist must not exceed the requirements imposed by the transmit holder (encapsulated in the PSR_INPUT parameter).

If the opportunist checks the PSR value of the detected TF and confirms that the intended transmission power is acceptable, it transmits it during the period of the TB PPDU(s) (displayed in the Common Info field). Specifically, the intended transmit power must be less than the PSR value measured in the legacy portion of the TF (ie the PHY header) minus the Received Power Level (RPL). The PSR value is calculated as follows.

Here, TX PWR _AP is the normalized transmit power in dBm at the output of the antenna connector and I^max_AP is the normalized value in dB that captures the maximum interference allowed in the transmit holder. In particular, I^max_AP is calculated by subtracting the minimum SNR giving 10% PER from the target RSSI indicated in the TF (based on the highest MCS used for UL HE TB PPDU transmission). A safety margin (set by the AP) is also included so that it does not exceed 5dB.

2. 트리거 프레임과 SR2. Trigger frame and SR

15 shows an operation according to UL-MU.

As shown, the transmitting STA (eg, AP) may perform channel access through contending (ie, backoff operation) and transmit a trigger frame 1030 . That is, the transmitting STA (eg, AP) may transmit the PPDU including the Trigger Frame 1030 . When a PPDU including a trigger frame is received, a TB (trigger-based) PPDU is transmitted after a delay of SIFS.

The

TB PPDUs

1041 and 1042 may be transmitted in the same time zone, and may be transmitted from a plurality of STAs (eg, user STAs) whose AIDs are indicated in the trigger frame 1030 . The ACK frame 1050 for the TB PPDU may be implemented in various forms.

Specific features of the trigger frame will be described with reference to FIGS. 16 to 19 . Even when UL-MU communication is used, an orthogonal frequency division multiple access (OFDMA) technique or MU MIMO technique may be used, and OFDMA and MU MIMO technique may be used simultaneously.

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

17 shows another example of a common information field of a trigger frame.

16 shows the HE variant of the common information field, and FIG. 17 shows the EHT variant of the common information field. That is, the trigger frame may include a common information field corresponding to the HE variant and/or a common information field corresponding to the EHT variant.

18 shows the format of a UL Spatial Reuse subfield.

16 and 17, when the trigger frame requests a HE TB PPDU, the UL Spatial Reuse subfield of the common information field is a value to be included in the Spatial Reuse field in the HE-SIG-A field of the requested HE TB PPDU. transmit In the UL Spatial Reuse subfield, each Spatial Reuse n subfield (1<=n<=4) is set to the same value as the corresponding subfield in the HE-SIG-A field of the HE TB PPDU. Spatial Reuse 1, Spatial Reuse 2, Spatial Reuse 3, and Spatial Reuse 4 fields included in the HE-SIG-A field of the HE TB PPDU are defined as follows. Each Spatial Reuse field consists of 4 bits.

Each Spatial Reuse field included in the HE-SIG-A field of the HE TB PPDU indicates whether a specific spatial reuse mode is allowed in a subband of the PPDU while the PPDU is transmitted, and when PSR reuse is allowed, Parameterized Spatial (PSRT) Reuse Transmission) indicates a value used to determine the limit on the transmission power of the PPDU.

First, if the Bandwidth field indicates 20 MHz, 40 MHz or 80 MHz, the Spatial Reuse 1 field is applied to the first 20 MHz subband. If the bandwidth field indicates 160/80+80 MHz, the Spatial Reuse 1 field is applied to the first 40 MHz subband of the 160 MHz operating band. The Spatial Reuse 1 field is set as one of the Spatial Reuse field encoding values for the HE TB PPDU as shown in Table 3 below. The Spatial Reuse 1 field, if present, refers to the first value in the TXVECTOR parameter SPATIAL_REUSE.

Second, if the bandwidth field indicates 40 MHz or 80 MHz, the Spatial Reuse 2 field is applied to the second 20 MHz subband. If the channel width in which the STA operates is 20 MHz, the Spatial Reuse 2 field is set to the same value as the Spatial Reuse 1 field. If the channel width in which the STA operates is 40 MHz in the 2.4 GHz band, the Spatial Reuse 2 field is set to the same value as the Spatial Reuse 1 field. If the bandwidth field indicates 160/80+80 MHz, the Spatial Reuse 2 field is applied to the second 40 MHz subband of the 160 MHz operating band. The Spatial Reuse 2 field is set as one of the Spatial Reuse field encoding values for the HE TB PPDU as shown in Table 3 below. The Spatial Reuse 2 field, if present, refers to the second value in the TXVECTOR parameter SPATIAL_REUSE.

Third, if the bandwidth field indicates 80 MHz, the Spatial Reuse 3 field is applied to the third 20 MHz subband. If the channel width in which the STA operates is 20 MHz or 40 MHz, the Spatial Reuse 3 field is set to the same value as the Spatial Reuse 1 field. If the bandwidth field indicates 160/80+80 MHz, the Spatial Reuse 3 field is applied to the third 40 MHz subband of the 160 MHz operating band. If the channel width in which the STA operates is 80+80 MHz, the Spatial Reuse 3 field is set to the same value as the Spatial Reuse 1 field. The Spatial Reuse 3 field is set as one of the Spatial Reuse field encoding values for the HE TB PPDU as shown in Table 3 below. The Spatial Reuse 3 field, if present, refers to the third value in the TXVECTOR parameter SPATIAL_REUSE.

Fourth, if the bandwidth field indicates 80 MHz, the Spatial Reuse 4 field is applied to the fourth 20 MHz subband. If the channel width in which the STA operates is 20 MHz, the Spatial Reuse 4 field is set to the same value as the Spatial Reuse 1 field. If the channel width in which the STA operates is 40 MHz, the Spatial Reuse 4 field is set to the same value as the Spatial Reuse 2 field. If the bandwidth field indicates 160/80+80 MHz, the Spatial Reuse 4 field is applied to the fourth 40 MHz subband of the 160 MHz operating band. If the channel width in which the STA operates is 80+80 MHz, the Spatial Reuse 4 field is set to the same value as the Spatial Reuse 2 field. The Spatial Reuse 4 field is set as one of the Spatial Reuse field encoding values for the HE TB PPDU as shown in Table 3 below. The Spatial Reuse 4 field, if present, refers to the fourth value in the TXVECTOR parameter SPATIAL_REUSE.

The four

Spatial Reuse

1, 2, 3, 4 fields are arranged in the order of frequency as follows.

In the case of 20 MHz, one Spatial Reuse field corresponds to the entire 20 MHz (the other three Spatial Reuse fields indicate the same value). The Spatial Reuse field applies only to the 20 MHz used for transmission.

In the case of 40 MHz, there are two Spatial Reuse fields including a Spatial Reuse 3 field having the same value as the Spatial Reuse 1 field and a Spatial Reuse 4 field having the same value as the Spatial Reuse 2 field. Each pair of Spatial Reuse fields applies only to the corresponding 20 MHz used for transmission.

In the case of 80 MHz, there are four Spatial Reuse fields, one for each 20 MHz subchannel.

- For OFDMA transmission of a given BW, each Spatial Reuse field corresponding to a 20 MHz subband is also applicable to the 242-tone RUs aligned closest to the frequency of the 20 MHz subband described above (in the tone plan for the corresponding BW). The correspondence to the 242-ton RU in the Spatial Reuse field is also applied to all RUs within the 242-ton RU. The above also indicates that the 20 MHz OBSS STA uses the Spatial Reuse field corresponding to its 20 MHz channel, the 40 MHz OBSS STA located in the lower half of the 80 MHz BSS uses the Spatial Reuse 1 field and the Spatial Reuse 2 field values, and 80 MHz It is implied that the 40MHz OBSS STA located in the upper frequency half of the BSS uses the Spatial Reuse 3 field and Spatial Reuse 4 field values.

In the case of 160 MHz and 80+80 MHz, there are four Spatial Reuse fields, one for each 40 MHz subchannel.

- For OFDMA transmission of a given BW, each Spatial Reuse field corresponding to a 40 MHz subband is also applicable to the 484 tone RUs aligned closest to the frequency of the 40 MHz subband. The correspondence to the 484-ton RU in the Spatial Reuse field is also applied to all RUs within the 484-ton RU.

The table below shows an example of encoding of the Spatial Reuse field for HE SU PPDU, HE ER SU PPDU, and HE MU PPDU.

ValueValue	MeaningMeaning
00	PSR_DISALLOWPSR_DISALLOW
1-121-12	Reserved Reserved
1313	SR_RESTRICTEDSR_RESTRICTED
1414	SR_DELAYEDSR_DELAYED
1515	PSR_AND_NON_SRG_OBSS_PD_PROHIBITEDPSR_AND_NON_SRG_OBSS_PD_PROHIBITED

Returning to FIG. 18 again, when the trigger frame requests an EHT TB PPDU, each Spatial Reuse n subfield (1<=n<=4) of the Common Info field is a Spatial Reuse 1 subfield or a Spatial Reuse 2 subfield of the Special User Info field. It is determined based on one of the fields.

19 shows an example of a Special User Info field format.

If the Special User Info field is included in the trigger frame, the Special User Info Field Present subfield of the EHT variant of the Common Info Field is set to 0, otherwise it is set to 1.

The Special User Info field is identified by the AID12 value of 2007 and is selectively present in the trigger frame generated by the EHT AP.

If present, the Special User Info field is located immediately after the Common Info field of the trigger frame, and delivers a nonderived subfield of the U-SIG field of the requested EHT TB PPDU, and the Special User Info Field of the Common Info field Present subfield is set to 0.

The existence of the Special User Info field in the trigger frame is indicated by B55 of the Common Info field in the trigger frame. B55 is set to 1 to indicate that there is no Special User Info field in the trigger frame, and is set to 0 to indicate that the Special User Info field exists in the trigger frame immediately after the Common Info field.

The Spatial Reuse n subfield (1<=n<=2) of FIG. 19 is set to the same value as the corresponding Spatial Reuse subfield in the U-SIG field of the EHT TB PPDU. Spatial Reuse 1 and Spatial Reuse 2 fields included in the U-SIG field of the EHT TB PPDU are defined as follows. Each Spatial Reuse field consists of 4 bits.

Each Spatial Reuse field included in the U-SIG field of the EHT TB PPDU indicates whether a specific spatial reuse mode is allowed in the subband of the PPDU while the PPDU is being transmitted. Indicates the value used to determine the limit for

First, if the Bandwidth field indicates 20 MHz or 40 MHz, the Spatial Reuse 1 field is applied to the first 20 MHz subband. When the bandwidth field indicates 80 MHz, the Spatial Reuse 1 field is applied to each 20 MHz subchannel of the first 40 MHz subband in the 80 MHz operating band. If the bandwidth field indicates 160 MHz, the Spatial Reuse 1 field is applied to each 20 MHz subchannel of the first 80 MHz subband in the 160 MHz operating band. If the bandwidth field indicates 320MHz-1 or 320MHz-2, the Spatial Reuse 1 field is applied to each 20MHz subchannel of the first 160MHz subband in the 320MHz operating band.

The Spatial Reuse 1 field is set as a SPATIAL_REUSE(1) parameter of the TXVECTOR including the Spatial Reuse field encoding value for the HE TB PPDU as shown in Table 3 above.

Second, when the bandwidth field indicates 20 MHz, the Spatial Reuse 2 field is set to the same value as the Spatial Reuse 1 field, and if dot11EHTBaseLineFeaturesImplementedOnly is true, it is ignored (disregarded). If the bandwidth field indicates 40 MHz, the Spatial Reuse 2 field is applied to the second 20 MHz subband. When operating in the 2.4 GHz band, the Spatial Reuse 2 field is set to the same value as the Spatial Reuse 1 field. If the bandwidth field indicates 80 MHz, the Spatial Reuse 2 field is applied to each 20 MHz subchannel of the second 40 MHz subband in the 80 MHz operating band. If the bandwidth field indicates 160 MHz, the Spatial Reuse 2 field is applied to each 20 MHz subchannel of the second 80 MHz subband in the 160 MHz operating band. If the bandwidth field indicates 320MHz-1 or 320MHz-2, the Spatial Reuse 2 field is applied to each 20MHz subchannel of the second 160MHz subband within the 320MHz operating band.

The Spatial Reuse 2 field is set as the SPATIAL_REUSE(2) parameter of the TXVECTOR including the Spatial Reuse field encoding value for the HE TB PPDU as shown in Table 3 above.

3. 본 명세서에 적용 가능한 실시예3. Examples applicable to the present specification

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

Meanwhile, in order to reduce interference between BSSs, spatial reuse can be used the same as 802.11ax, and in this specification, the spatial reuse field configuration of the EHT TB PPDU is proposed.

10 shows the structure of a representative EHT PPDU. It may be used for SU and MU transmission, and the EHT-SIG may not be included in the TB PPDU transmission.

Universal-SIG (U-SIG) includes a version independent field and a version dependent field.

EHT-SIG can carry various common information and user specific information.

The bandwidth can be indicated using the Bandwidth field, which can be included in the version independent of U-SIG. The corresponding field may be composed of 3 bits, and only bandwidth information may be carried without including information about the preamble puncturing pattern. In addition, puncturing information may be carried in another field of the U-SIG or a specific field of the EHT-SIG.

In addition, the version independent field may include a 3-bit version identifier and 1-bit DL/UL field indicating the Wi-Fi version after 802.11be and 802.11be, BSS color, TXOP duration, etc., and the version dependent field includes PPDU type, etc. Information may be included. In addition, in U-SIG, two symbols are jointly encoded, and each 20MHz consists of 52 data tones and 4 pilot tones. It is also modulated in the same way as HE-SIG-A. That is, it is modulated with a BPSK 1/2 code rate. In addition, EHT-SIG can be encoded with variable MCS, and as in the existing 802.11ax, 1 2 1 2 … in units of 20 MHz. It may have a structure (it may be composed of a different structure. For example, 1 2 3 4 … or 1 2 1 2 3 4 3 4 … may also be configured in units of 80 MHz, and in a bandwidth of 80 MHz or more, EHT-SIG is replicated in units of 80 MHz) (duplication) can be.

Spatial Reuse may be used to reduce interference with OBSS. This specification particularly proposes the configuration of the spatial reuse field in the EHT TB PPDU. In the EHT TB PPDU, the spatial reuse field may be located in the U-SIG version dependent field, and may consist of 4 fields as in 802.11ax, and each field may use 4 bits. The meaning of each entry expressed by each 4-bit may be the same as described above or may have a different meaning. Alternatively, each field may use a different number of bits. In addition, in the EHT TB PPDU, the spatial reuse field may consist of two fields instead of four.

The AP notifies the transmit power through the value of the spatial reuse field, so that when it is determined that a specific STA will not have significant interference or influence on other STAs when performing spatial reuse, the AP adjusts the transmit power (related to the CCA level) By doing so, the criterion for determining that the channel is idle can be relaxed. Accordingly, it is possible to use the transmission resource more efficiently by allowing other STAs to utilize the corresponding channel.

In addition, since the composition of each field may vary depending on the bandwidth, it can be proposed in consideration of the following bandwidth field.

BW field 1 entry configuration: 20/40/80/160/320 MHz

BW field 2 entry configuration: 20/40/80/160/320_1/320_2 MHz

In 802.11be, transmission using a non-contiguous channel may not be considered in the PHY, so the BW field may be configured only with a contiguous bandwidth entry as above. In addition, since channelization of 6GHz may be configured as shown in FIG. 20, two 320MHz entries may be used as in BW field 2 to distinguish different 320MHz channelizations.

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

The plurality of channels in the 6 GHz band include UNII (Unlicensed National Information Infrastructure)-5 to UNII-8. A plurality of channels may be set within the 6 GHz band, and the bandwidth of each channel may be variously set to 20 MHz, 40 MHz (not shown), 80 MHz, 160 MHz, or 320 MHz.

If 320 MHz is not distinguished as in the BW field 1 entry, assuming that a specific STA uses a 320 MHz band spanning UNII5 to UNII6/7, and the OBSS STA uses the 80 MHz band of UNII6, from the standpoint of the OBSS STA, it is assigned 80 MHz. There is an ambiguity that does not know whether it overlaps the rear 160 MHz of overlapping 320 MHz_1 (160 MHz with high frequency in 320 MHz_1) or overlaps with the preceding 160 MHz of 320 MHz_2 (160 MHz with low frequency in 320 MHz_2). Therefore, it can be said that there is no ambiguity if it is divided into 320MHz_1 and 320MHz_2 like the BW field 2 entry.

3.1 Method 1

Assume the above BW field 1 or BW field 2.

3.1.1 spatial reuse field design at BW = 20 MHz

TB PPDU transmission in all bands of 2.4/5/6GHz may be considered.

When composed of four spatial reuse fields, all four spatial reuse fields may have the same spatial reuse value and may mean a spatial reuse value corresponding to a 20 MHz channel.

When composed of two spatial reuse fields, all two spatial reuse fields may have the same spatial reuse value and may mean a spatial reuse value corresponding to a 20 MHz channel.

3.1.2 spatial reuse field design at BW = 40 MHz

TB PPDU transmission in all bands of 2.4/5/6GHz may be considered. First, it is a case of using four spatial reuse fields.

Spatial reuse field 1: In general, it may mean the spatial reuse value of the lowest 20MHz subchannel. However, when a 20MHz operating STA transmits a TB PPDU, it may mean a spatial reuse value of an operating 20MHz subchannel. The reason is that it is not possible to determine the channel state for 20 MHz other than the corresponding 20 MHz to be operated.

Spatial reuse field 2: In general, it may mean the spatial reuse value of the second lower 20MHz subchannel. However, when the 20 MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel status for other 20MHz except for the corresponding 20MHz to be operated. In addition, even when a 40 MHz operating STA transmits a TB PPDU in the 2.4 GHz band, it may be set to the same value as the Spatial reuse field 1. The reason is that because 40 MHz channelization overlaps in the 2.4 GHz band, it is not possible to determine which channelization the OBSS STA that decoded the TB PPDU in a specific 20 MHz channel uses, so it is simply set to the same value.

Spatial reuse field 3 may be set equal to 1, and spatial reuse 4 may be set equal to 2.

It may be composed of two spatial reuse fields as follows.

Spatial reuse field 1: In general, it may mean the spatial reuse value of the lowest 20MHz subchannel. However, when a 20 MHz operating STA transmits a TB PPDU, it may mean a spatial reuse value of an operating 20 MHz subchannel. The reason is that the channel state for 20 MHz other than the corresponding 20 MHz in operation cannot be determined.

Spatial reuse field 2: In general, it may mean the highest spatial reuse value of the 20MHz subchannel. However, when the 20 MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel status for other 20MHz except for the corresponding 20MHz to be operated. In addition, even when a 40 MHz operating STA transmits a TB PPDU in the 2.4 GHz band, it may be set to the same value as the Spatial reuse field 1. The reason is that because 40 MHz channelization overlaps in the 2.4 GHz band, it cannot be determined which channelization the OBSS STA that decoded the TB PPDU in a specific 20 MHz channel used is simply set to the same value.

3.1.3 spatial reuse field design at BW = 80 MHz

TB PPDU transmission in the 5/6 GHz band may be considered. First, it is a case of using four spatial reuse fields.

Spatial reuse field 1: In general, it may mean the spatial reuse value of the lowest 20MHz subchannel. However, when a 20 MHz operating STA transmits a TB PPDU, it may mean a spatial reuse value of an operating 20 MHz subchannel. The reason is that the channel state for 20 MHz other than the corresponding 20 MHz in operation cannot be determined. In addition, when a 40MHz operating STA transmits a TB PPDU, it may mean a spatial reuse value of a low 20MHz subchannel among operating 40MHz subchannels. The reason is that it is not possible to determine the channel state for other 40 MHz except for the corresponding 40 MHz in operation.

Spatial reuse field 2: In general, it may mean the spatial reuse value of the second lower 20MHz subchannel. However, when the 20 MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel state for 20 MHz other than the corresponding 20 MHz that operates. In addition, when a 40MHz operating STA transmits a TB PPDU, it may mean a spatial reuse value of a high 20MHz subchannel among operating 40MHz subchannels. The reason is that it is not possible to determine the channel state for other 40 MHz except for the corresponding 40 MHz to operate.

Spatial reuse field 3: In general, it may mean the spatial reuse value of the second high 20MHz subchannel. However, when the 20 MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel state for 20 MHz other than the corresponding 20 MHz that operates. In addition, when the 40 MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel state for other 40 MHz except for the corresponding 40 MHz that operates.

Spatial reuse field 4: In general, it may mean the highest spatial reuse value of the 20MHz subchannel. However, when the 20 MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel state for 20 MHz other than the corresponding 20 MHz that operates. In addition, when the 40MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 2 . The reason is simply setting the same value because it cannot determine the channel state for other 40 MHz except for the corresponding 40 MHz that operates.

It may be composed of two spatial reuse fields as follows.

Spatial reuse field 1: In general, it may mean the spatial reuse value of the lowest 40MHz subchannel. However, when a 20 MHz operating STA transmits a TB PPDU, it may mean a spatial reuse value of an operating 20 MHz subchannel. The reason is that the channel state for 20 MHz other than the corresponding 20 MHz in operation cannot be determined. In addition, when the 40 MHz operating STA transmits a TB PPDU, it may mean a spatial reuse value of a 40 MHz subchannel that operates. The reason is that it is not possible to determine the channel state for other 40 MHz except for the corresponding 40 MHz in operation.

Spatial reuse field 2: In general, it may mean the highest spatial reuse value of the 40MHz subchannel. However, when the 20 MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel status for other 20MHz except for the corresponding 20MHz to be operated. In addition, when the 40MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel status for other 40MHz except for the corresponding 40MHz to be operated.

3.1.4 spatial reuse field design at BW = 160 MHz

TB PPDU transmission in the 5/6 GHz band may be considered. In addition, the spatial reuse field can be configured differently for each 80 MHz, and for each 80 MHz, it can be configured as suggested in 3.1.3.

For example, if a specific STA transmits a TB PPDU using 996+484RU (assuming TB PPDU transmission using 996RU at 80MHz low and 484 RU at 80MHz high), BW is set to 160MHz, and there are a total of 6 20MHz U-SIGs. And in the four U-SIGs corresponding to the low 80MHz, the spatial reuse field that exists in each has a value corresponding to the low 80MHz and can be configured as in 3.1.3 (that is, the four U-SIGs have the same spatial reuse field) ), the spatial reuse field existing in each of the two U-SIGs corresponding to high 80MHz can be configured as in 3.1.3 with a value corresponding to high 80MHz (that is, two U-SIGs use the same spatial reuse field have).

As another example, when a specific STA transmits a TB PPDU using 996RU and other STAs transmit a TB PPDU using the remaining 80MHz, the BW of each TB PPDU is set to 160MHz. In this case, a total of four 20MHz U-SIGs exist in a specific STA that transmits a TB PPDU using 996RU, and the spatial reuse field present in each of the four U-SIGs is a spatial reuse field corresponding to 80MHz at which the PPDU is being transmitted. As a result, it can be configured as in 3.1.3 (that is, four U-SIGs have the same spatial reuse field).

3.1.5 BW = 320MHz (or 320_1 or 320_2) spatial reuse field design

TB PPDU transmission in the 6GHz band may be considered. If 320MHz channelization is defined in 5GHz, TB PPDU transmission may be considered even in 5GHz. In addition, the spatial reuse field can be configured differently for each 80 MHz, and for each 80 MHz, it can be configured as suggested in 3.1.3.

In the proposal of 3.1 above, according to the operating channel width of the STA that transmits the TB PPDU (that is, the STA that operates narrower than the bandwidth in wide bandwidth transmission, for example, 80MHz operating STA in 160MHz TB PPDU transmission), the spatial reuse field of Although it is suggested that the configuration may be different, the actual spatial reuse field is to copy the information transmitted from the trigger frame as it is, so it can be configured in a general way for each bandwidth regardless of the operating channel width of the STA. However, in 2.4GHz and 40MHz, spatial reuse fields may always be the same as spatial reuse field 1 due to ambiguity. Also, since two/four 80MHz subchannels exist during 160/320MHz TB PPDU transmission, the number of 80MHz subchannels (2 for 160MHz, 4 for 320MHz) is included in the number of SR fields (2 or 4) of the TB PPDU in the trigger frame. ) multiplied by the number of SR fields may be required.

3.2 Method 2

A configuration of BW field 2 is assumed.

3.2.1 Spatial reuse field design at BW = 20 MHz

TB PPDU transmission in all bands of 2.4/5/6GHz may be considered.

3.2.2 spatial reuse field design at BW = 40 MHz

Spatial reuse field 2: In general, it may mean the spatial reuse value of the second lower 20MHz subchannel. However, when the 20 MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel state for 20 MHz other than the corresponding 20 MHz that operates. In addition, even when a 40 MHz operating STA transmits a TB PPDU in the 2.4 GHz band, it may be set to the same value as the Spatial reuse field 1. The reason is that because 40 MHz channelization overlaps in the 2.4 GHz band, it cannot be determined which channelization the OBSS STA that decoded the TB PPDU in a specific 20 MHz channel used is simply set to the same value.

It may be composed of two spatial reuse fields as follows.

Spatial reuse field 2: In general, it may mean the highest spatial reuse value of the 20MHz subchannel. However, when the 20 MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel state for 20 MHz other than the corresponding 20 MHz that operates. In addition, even when a 40 MHz operating STA transmits a TB PPDU in the 2.4 GHz band, it may be set to the same value as the Spatial reuse field 1. The reason is that because 40 MHz channelization overlaps in the 2.4 GHz band, it cannot be determined which channelization the OBSS STA that decoded the TB PPDU in a specific 20 MHz channel used is simply set to the same value.

3.2.3 spatial reuse field design at BW = 80 MHz

Spatial reuse field 1: In general, it may mean the spatial reuse value of the lowest 20MHz subchannel. However, when a 20 MHz operating STA transmits a TB PPDU, it may mean a spatial reuse value of an operating 20 MHz subchannel. The reason is that the channel state for 20 MHz other than the corresponding 20 MHz in operation cannot be determined. In addition, when a 40MHz operating STA transmits a TB PPDU, it may mean a spatial reuse value of a low 20MHz subchannel among 40MHz subchannels operated. The reason is that it is not possible to determine the channel state for other 40 MHz except for the corresponding 40 MHz in operation.

Spatial reuse field 2: In general, it may mean the spatial reuse value of the second lower 20MHz subchannel. However, when the 20 MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel state for 20 MHz other than the corresponding 20 MHz that operates. In addition, when a 40MHz operating STA transmits a TB PPDU, it may mean a spatial reuse value of a high 20MHz subchannel among operating 40MHz subchannels. The reason is that it is not possible to determine the channel state for other 40 MHz except for the corresponding 40 MHz in operation.

It may be composed of two spatial reuse fields as follows.

Spatial reuse field 1: In general, it may mean the spatial reuse value of the lowest 40MHz subchannel. However, when a 20MHz operating STA transmits a TB PPDU, it may mean a spatial reuse value of an operating 20MHz subchannel. The reason is that the channel state for 20 MHz other than the corresponding 20 MHz in operation cannot be determined. In addition, when the 40 MHz operating STA transmits a TB PPDU, it may mean a spatial reuse value of a 40 MHz subchannel that operates. The reason is that it is not possible to determine the channel state for other 40 MHz except for the corresponding 40 MHz in operation.

Spatial reuse field 2: In general, it may mean the highest spatial reuse value of the 40MHz subchannel. However, when the 20 MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel state for 20 MHz other than the corresponding 20 MHz that operates. In addition, when the 40MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel state for other 40 MHz except for the corresponding 40 MHz that operates.

3.2.4 spatial reuse field design at BW = 160 MHz

Spatial reuse field 1: In general, it may mean the spatial reuse value of the lowest 40MHz subchannel. However, when a 20MHz operating STA transmits a TB PPDU, it may mean a spatial reuse value of an operating 20MHz subchannel. The reason is that the channel state for 20 MHz other than the corresponding 20 MHz in operation cannot be determined. In addition, when the 40 MHz operating STA transmits a TB PPDU, it may mean a spatial reuse value of a 40 MHz subchannel that operates. The reason is that it is not possible to determine the channel state for other 40 MHz except for the corresponding 40 MHz in operation. In addition, when an 80MHz operating STA transmits a TB PPDU, it may mean a spatial reuse value of a low 40MHz subchannel among 80MHz subchannels operating. The reason is that the channel state for 80 MHz other than the corresponding 80 MHz in operation cannot be determined.

Spatial reuse field 2: In general, it may mean the spatial reuse value of the second lower 40MHz subchannel. However, when the 20 MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel state for 20 MHz other than the corresponding 20 MHz that operates. In addition, when the 40MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel state for other 40 MHz except for the corresponding 40 MHz that operates. In addition, when an 80MHz operating STA transmits a TB PPDU, it may mean a spatial reuse value of a high 40MHz subchannel among 80MHz subchannels operating. The reason is that the channel state for 80 MHz other than the corresponding 80 MHz in operation cannot be determined.

Spatial reuse field 3: In general, it may mean the spatial reuse value of the second high 40MHz subchannel. However, when the 20 MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel state for 20 MHz other than the corresponding 20 MHz that operates. In addition, when the 40 MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel state for other 40 MHz except for the corresponding 40 MHz that operates. In addition, when the 80MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel status for other 80 MHz except for the 80 MHz that operates.

Spatial reuse field 4: In general, it may mean the highest spatial reuse value of the 40MHz subchannel. However, when the 20 MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel state for 20 MHz other than the corresponding 20 MHz that operates. In addition, when the 40 MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel state for other 40 MHz except for the corresponding 40 MHz that operates. In addition, when the 80MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 2 . The reason is simply setting the same value because it cannot determine the channel status for other 80 MHz except for the 80 MHz that operates.

It may be composed of two spatial reuse fields as follows.

Spatial reuse field 1: In general, it may mean the lowest spatial reuse value of the 80MHz subchannel. However, when a 20 MHz operating STA transmits a TB PPDU, it may mean a spatial reuse value of an operating 20 MHz subchannel. The reason is that the channel state for 20 MHz other than the corresponding 20 MHz in operation cannot be determined. In addition, when the 40 MHz operating STA transmits a TB PPDU, it may mean a spatial reuse value of a 40 MHz subchannel that operates. The reason is that it is not possible to determine the channel state for other 40 MHz except for the corresponding 40 MHz in operation. In addition, when an 80MHz operating STA transmits a TB PPDU, it may mean a spatial reuse value of an 80MHz subchannel that operates. The reason is that the channel state for 80 MHz other than the corresponding 80 MHz in operation cannot be determined.

Spatial reuse field 2: In general, it may mean the highest spatial reuse value of the 80MHz subchannel. However, when the 20 MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel state for 20 MHz other than the corresponding 20 MHz that operates. In addition, when the 40MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel state for other 40 MHz except for the corresponding 40 MHz that operates. In addition, when the 80MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel status for other 80 MHz except for the 80 MHz that operates.

3.2.5 BW = spatial reuse field design in 320_1 or 320_2

TB PPDU transmission in the 6GHz band may be considered. If 320MHz channelization is defined in 5GHz, TB PPDU transmission may be considered even in 5GHz. First, it is a case of using four spatial reuse fields.

Spatial reuse field 1: In general, it may mean the lowest spatial reuse value of the 80MHz subchannel. However, when a 20 MHz operating STA transmits a TB PPDU, it may mean a spatial reuse value of an operating 20 MHz subchannel. The reason is that the channel state for 20 MHz other than the corresponding 20 MHz in operation cannot be determined. In addition, when the 40 MHz operating STA transmits a TB PPDU, it may mean a spatial reuse value of a 40 MHz subchannel that operates. The reason is that it is not possible to determine the channel state for other 40 MHz except for the corresponding 40 MHz in operation. In addition, when an 80MHz operating STA transmits a TB PPDU, it may mean a spatial reuse value of an 80MHz subchannel that operates. The reason is that the channel state for 80 MHz other than the corresponding 80 MHz in operation cannot be determined. In addition, when a 160MHz operating STA transmits a TB PPDU, it may mean a spatial reuse value of a low 80MHz subchannel among 160MHz subchannels operated. The reason is that it is not possible to determine the channel state for 160 MHz other than the corresponding 160 MHz in operation.

Spatial reuse field 2: In general, it may mean the spatial reuse value of the second lower 80MHz subchannel. However, when the 20 MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel state for other 20 MHz except for the corresponding 20 MHz that operates. In addition, when the 40MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel state for other 40 MHz except for the corresponding 40 MHz that operates. In addition, when the 80MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel status for other 80 MHz except for the 80 MHz that operates. In addition, when the 160 MHz operating STA transmits a TB PPDU, it may mean a spatial reuse value of a high 80 MHz subchannel among 160 MHz subchannels operating. The reason is that it is not possible to determine the channel state for 160 MHz other than the corresponding 160 MHz in operation.

Spatial reuse field 3: In general, it may mean the spatial reuse value of the second high 80MHz subchannel. However, when the 20 MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel state for 20 MHz other than the corresponding 20 MHz that operates. In addition, when the 40 MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel state for other 40 MHz except for the corresponding 40 MHz that operates. In addition, when the 80MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel status for other 80 MHz except for the 80 MHz that operates. In addition, when the 160 MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply to set the same value because it cannot determine the channel status for other 160 MHz except for the 160 MHz to be operated.

Spatial reuse field 4: In general, it may mean the highest spatial reuse value of the 80MHz subchannel. However, when the 20 MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel state for 20 MHz other than the corresponding 20 MHz that operates. In addition, when the 40 MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel state for other 40 MHz except for the corresponding 40 MHz that operates. In addition, when the 80MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel status for other 80 MHz except for the 80 MHz that operates. In addition, when the 160 MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 2 . The reason is simply setting the same value because it cannot determine the channel status for other 160 MHz except for the 160 MHz that operates.

It may be composed of two spatial reuse fields as follows.

Spatial reuse field 1: In general, it may mean the lowest spatial reuse value of the 160 MHz subchannel. However, when a 20 MHz operating STA transmits a TB PPDU, it may mean a spatial reuse value of an operating 20 MHz subchannel. The reason is that the channel state for 20 MHz other than the corresponding 20 MHz in operation cannot be determined. In addition, when the 40 MHz operating STA transmits a TB PPDU, it may mean a spatial reuse value of a 40 MHz subchannel that operates. The reason is that it is not possible to determine the channel state for other 40 MHz except for the corresponding 40 MHz in operation. In addition, when an 80MHz operating STA transmits a TB PPDU, it may mean a spatial reuse value of an 80MHz subchannel that operates. The reason is that the channel state for 80 MHz other than the corresponding 80 MHz in operation cannot be determined. In addition, when the 160 MHz operating STA transmits the TB PPDU, it may mean a spatial reuse value of the 160 MHz subchannel that operates. The reason is that it cannot determine the channel state for 160 MHz other than the corresponding 160 MHz in operation.

Spatial reuse field 2: In general, it may mean the highest spatial reuse value of the 160MHz subchannel. However, when the 20 MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel state for 20 MHz other than the corresponding 20 MHz that operates. In addition, when the 40MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel state for other 40 MHz except for the corresponding 40 MHz that operates. In addition, when the 80MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel status for other 80 MHz except for the 80 MHz that operates. In addition, when the 160 MHz operating STA transmits the TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is simply setting the same value because it cannot determine the channel status for other 160 MHz except for the 160 MHz that operates.

In the proposal of 3.2 above, according to the operating channel width of the STA that transmits the TB PPDU (that is, the STA that operates narrower than that bandwidth in wide bandwidth transmission, for example, 80MHz operating STA in 160MHz TB PPDU transmission) of the spatial reuse field Although it is suggested that the configuration may be different, the actual spatial reuse field is to copy the information transmitted from the trigger frame as it is, so it can be configured in a general way for each bandwidth regardless of the operating channel width of the STA. However, in 2.4GHz and 40MHz, spatial reuse fields may always be the same as spatial reuse field 1 due to ambiguity.

3.3. Method 3

Consider the configuration of BW field 1 above. The configuration of the SR field of 20MHz, 40MHz, 80MHz, and 160MHz can be the same as the proposal in 3.2. In particular, the actual spatial reuse field is to copy the information transmitted from the trigger frame as it is, so it is common for each bandwidth regardless of the operating channel width of the STA. It can be configured in the same way. However, in 2.4GHz and 40MHz, spatial reuse fields may always be the same as spatial reuse field 1 due to ambiguity. This is explained below.

3.3.1 Spatial reuse field design at BW = 20 MHz

TB PPDU transmission in all bands of 2.4/5/6GHz may be considered.

4.3.2 Spatial reuse field design at BW = 40 MHz

Spatial reuse field 1: In general, it may mean the spatial reuse value of the lowest 20MHz subchannel.

Spatial reuse field 2: In general, it may mean the spatial reuse value of the second lower 20MHz subchannel. In addition, in the case of transmitting the 2.4GHz band TB PPDU, it may be set to the same value as the Spatial reuse field 1. The reason is that because 40 MHz channelization overlaps in the 2.4 GHz band, it cannot be determined which channelization the OBSS STA that decoded the TB PPDU in a specific 20 MHz channel used is simply set to the same value.

It may be composed of two spatial reuse fields as follows.

Spatial reuse field 2: In general, it may mean the highest spatial reuse value of the 20MHz subchannel. In addition, even when the TB PPDU is transmitted in the 2.4 GHz band, it may be set to the same value as the Spatial reuse field 1. The reason is that because 40 MHz channelization overlaps in the 2.4 GHz band, it cannot be determined which channelization the OBSS STA that decoded the TB PPDU in a specific 20 MHz channel used is simply set to the same value.

3.3.3 Spatial reuse field design at BW = 80MHz

Spatial reuse field 1: In general, it may mean the spatial reuse value of the lowest 20MHz subchannel. Spatial reuse field 2: In general, it may mean the spatial reuse value of the second lower 20MHz subchannel.

Spatial reuse field 3: In general, it may mean the spatial reuse value of the second high 20MHz subchannel.

Spatial reuse field 4: In general, it may mean the highest spatial reuse value of the 20MHz subchannel.

It may be composed of two spatial reuse fields as follows.

Spatial reuse field 1: In general, it may mean the spatial reuse value of the lowest 40MHz subchannel.

Spatial reuse field 2: In general, it may mean the highest spatial reuse value of the 40MHz subchannel.

3.3.4 spatial reuse field design at BW = 160 MHz

Spatial reuse field 2: In general, it may mean the spatial reuse value of the second lower 40MHz subchannel.

Spatial reuse field 3: In general, it may mean the spatial reuse value of the second high 40MHz subchannel.

Spatial reuse field 4: In general, it may mean the highest spatial reuse value of the 40MHz subchannel.

It may be composed of two spatial reuse fields as follows.

Spatial reuse field 1: In general, it may mean the lowest spatial reuse value of the 80MHz subchannel.

Spatial reuse field 2: In general, it may mean the highest spatial reuse value of the 80MHz subchannel.

3.3.5 BW = spatial reuse field design at 320 MHz

TB PPDU transmission in the 5/6 GHz band may be considered. When the OBSS STA sees only a specific channel in the corresponding BW configuration, it is not possible to specify which of the two types of 320 MHz channelization configurations by decoding only the BW field of the TB PPDU. If it can be specified in an additional way, the spatial reuse field can be configured as follows.

First, it is a case of using four spatial reuse fields.

Spatial reuse field 2: In general, it may mean the spatial reuse value of the second lower 80MHz subchannel.

Spatial reuse field 3: In general, it may mean the spatial reuse value of the second high 80MHz subchannel.

Spatial reuse field 4: In general, it may mean the highest spatial reuse value of the 80MHz subchannel.

It may be composed of two spatial reuse fields as follows.

Spatial reuse field 1: In general, it may mean the lowest spatial reuse value of the 160 MHz subchannel.

Spatial reuse field 2: In general, it may mean the highest spatial reuse value of the 160MHz subchannel.

If the type of 320MHz channelization cannot be specified because there is no additional method, the spatial reuse field can be configured as follows.

First, it is a case of using four spatial reuse fields.

Spatial reuse field 2: In general, it may mean the spatial reuse value of the second lower 80MHz subchannel. Alternatively, it may be set to the same value as spatial reuse field 1. Although the OBSS STA cannot know exactly what 80MHz the part it is decoding is at least the odd-numbered (first or third) 80MHz or the even-numbered (second or fourth) 80MHz, two It may be desirable to mean the spatial reuse value of the second lower 80MHz subchannel.

Spatial reuse field 3: Since the OBSS STA cannot know exactly what 80 MHz the part it is decoding is, it may be set to the same value as spatial reuse field 1.

Spatial reuse field 4: may be set to the same value as spatial reuse field 1 or spatial reuse field 2. Although the OBSS STA cannot know exactly what 80MHz the part it is decoding is at least the odd-numbered (first or third) 80MHz or the even-numbered (second or fourth) 80MHz, the spatial It may be desirable to set the same value as reuse field 2.

It may be composed of two spatial reuse fields as follows.

Spatial reuse field 2: Since the OBSS STA cannot specify whether the channel part it is decoding is the first 160 MHz or the second 160 MHz, it may be set to the same value as spatial reuse field 1.

In the above proposal, it was assumed that the number of spatial reuse fields of the trigger frame and the TB PPDU is the same, and the TB PPDU means the EHT TB PPDU (the spatial reuse field of the trigger frame is the UL Spatial Reuse subfield). In 802.11ax, four spatial reuse fields exist in the trigger frame, and therefore, when triggering TB A-PPDU (PPDU in which EHT TB PPDU and HE TB PPDU are transmitted simultaneously by trigger frame), basically, there are four spatial reuse fields in the trigger frame. must exist (since there are 4 spatial reuse fields in the common info field of the HE TB PPDU). Therefore, if four spatial reuse fields exist in the EHT TB PPDU, the spatial reuse field in the common info field of the trigger frame can be copied as it is (that is, the four spatial reuse fields in the common info field of the trigger frame are It may be set identically to the four spatial reuse fields of the TB PPDU) Additionally, four spatial reuse fields for only EHT may exist in the trigger frame (that is, the additional four spatial reuse fields of the trigger frame are the TB PPDU proposed above). It can be set identically to the four spatial reuse fields of ). In addition, if two spatial reuse fields exist in the EHT TB PPDU, two additional spatial reuse fields may be configured in the trigger frame (that is, two additional spatial reuse fields for the EHT TB PPDU in the trigger frame are suggested above). may be set identically to the two spatial reuse fields of the TB PPDU). The additional spatial reuse field for the EHT TB PPDU may use the UL HE-SIG-A2 Reserved subfield or use a special AID to configure the user info field and use it like the EHT common info field. 16 shows a common info field in a trigger frame of 802.11ax (user info field is omitted). In 802.11be, this is recycled, but the UL HE SIG-A2 Reserved field of each reserved field and common info field can be used for a specific purpose, and the structure of the user info field can be modified and used in another form.

21 shows an example in which a TB A-PPDU is transmitted.

A TB A-PPDU (Trigger Based Aggregated-PPDU) is a PPDU in which an EHT TB PPDU and an HE TB PPDU are simultaneously transmitted by a trigger frame. As shown in FIG. 21 , the trigger frame may trigger the EHT TB PPDU and the HE TB PPDU, and the TB A-PPDU may be transmitted simultaneously by one STA by an aggregation of the EHT TB PPDU and the HE TB PPDU. Alternatively, the TB A-PPDU may be an aggregation of the EHT TB PPDU and the HE TB PPDU, and the EHT TB PPDU or the HE TB PPDU may be transmitted by a plurality of STAs.

As mentioned above, in the trigger frame that triggers the TB A-PPDU, four spatial reuse fields for the HE TB PPDU and two spatial reuse fields for the EHT TB PPDU may exist. The four spatial reuse fields can be set to a value for the bandwidth of only the HE TB PPDU (that is, only the bandwidth in which the HE TB PPDU is transmitted regardless of the overall bandwidth of the TB A-PPDU), and the two spatial reuse fields are the EHT TB PPDU It can be set to a value considering only the bandwidth or the entire bandwidth.

3.4. Method 4

Assume the above BW field 1 or BW field 2. In addition, it is assumed that two spatial reuse subfields exist in the TB PPDU, and it is assumed that the configuration is configured using four specific spatial reuse subfields (16-bit UL Spatial Reuse subfield) in the trigger frame. (Unlike 3.3, it may be considered that an additional spatial reuse field for EHT is not configured within the trigger frame, or it may be considered that only EHT TB PPDU is triggered). The TB PPDU described below is the EHT TB PPDU, and the TB A-PPDU is a PPDU in which the EHT TB PPDU and the HE TB PPDU are simultaneously transmitted by a trigger frame. There are 4 spatial reuse subfields in the HE TB PPDU. That is, the spatial reuse subfield in the HE TB PPDU is always the same as the spatial reuse subfield of the trigger frame.

3.4.1 Spatial reuse field design at BW = 20 MHz

TB PPDU transmission in all bands of 2.4/5/6GHz may be considered.

The four spatial reuse subfields of the trigger frame may have the same spatial reuse value and may mean a spatial reuse value corresponding to a 20 MHz channel. Alternatively,

spatial reuse

1 and 2 may have the same spatial reuse value, and

spatial reuse

3 and 4 may be reserved. Considering A-PPDU triggering, the former may be better.

The two spatial reuse fields of the TB PPDU can be configured by copying

spatial reuse fields

1 and 2 of the Trigger frame as they are. That is, it may have the same spatial reuse value and may mean a spatial reuse value corresponding to a 20 MHz channel.

3.4.2 spatial reuse field design at BW = 40 MHz

TB PPDU transmission in all bands of 2.4/5/6GHz may be considered. The four spatial reuse subfields of the trigger frame can be configured as follows.

Spatial reuse field 3 may be set equal to 1, and spatial reuse 4 may be set equal to 2. Alternatively,

spatial reuse

The two spatial reuse fields of the TB PPDU can be configured by copying

spatial reuse fields

1 and 2 of the Trigger frame as they are. That is, it can be as follows.

3.4.3 spatial reuse field design at BW = 80 MHz

TB PPDU transmission in the 5/6 GHz band may be considered. The four spatial reuse subfields of the trigger frame can be configured as follows.

Spatial reuse field 1: In general, it may mean the spatial reuse value of the lowest 40MHz subchannel. Spatial reuse field 2: In general, it may mean the highest spatial reuse value of the 40MHz subchannel.

spatial reuse

The two spatial reuse fields of the TB PPDU can be configured by copying

spatial reuse fields

1 and 2 of the Trigger frame as they are. That is, it can be as follows.

Alternatively, the four spatial reuse subfields of the Trigger frame can be configured as follows. Considering A-PPDU triggering, the suggestion below may be better.

Spatial reuse field 2: In general, it may mean the spatial reuse value of the second lower 20MHz subchannel.

In this case, the two spatial reuse fields of the TB PPDU can be configured by copying

spatial reuse fields

1 and 3 of the Trigger frame as they are or by copying 2 and 4 as they are. Alternatively, you can select and copy one of the two values in each field as shown below. One of the two values in each field can be chosen as the larger value or the smaller value.

Spatial reuse field 1: In general, it may mean the spatial reuse value of the lowest or second lowest 20MHz subchannel.

Spatial reuse field 2: In general, it may mean the spatial reuse value of the highest or second highest 20MHz subchannel.

Alternatively, the two spatial reuse fields of the TB PPDU may be defined differently for each 40 MHz (that is, the U-SIG configuration may be different for each 40 MHz), and at a low 40 MHz,

spatial reuse fields

1 and 2 of the Trigger frame are copied and configured as it is. At high 40MHz,

spatial reuse fields

3 and 4 of the Trigger frame can be copied and configured as it is. That is, it can be as follows.

Spatial reuse field at low 40MHz 1: In general, it may mean the spatial reuse value of the lowest 20MHz subchannel.

Spatial reuse field at low 40MHz 2: In general, it may mean the spatial reuse value of the second low 20MHz subchannel.

Spatial reuse field at high 40MHz 1: In general, it may mean the spatial reuse value of the second high 20MHz subchannel.

Spatial reuse field at high 40MHz 2: In general, it may mean the highest spatial reuse value of the 20MHz subchannel.

3.4.4 spatial reuse field design at BW = 160 MHz

spatial reuse

The two spatial reuse fields of the TB PPDU can be configured by copying

spatial reuse fields

1 and 2 of the Trigger frame as they are. That is, it can be as follows.

spatial reuse fields

Spatial reuse field 1: In general, it may mean the spatial reuse value of the lowest or second lowest 40MHz subchannel.

Spatial reuse field 2: In general, it may mean the spatial reuse value of the highest or second highest 40MHz subchannel.

Alternatively, the two spatial reuse fields of the TB PPDU may be defined differently for each 80 MHz (that is, the U-SIG configuration may be different for each 80 MHz), and at low 80 MHz,

spatial reuse fields

1 and 2 of the Trigger frame are copied and configured as it is. At high 80MHz,

spatial reuse fields

Spatial reuse field at low 80MHz 1: In general, it may mean the spatial reuse value of the lowest 40MHz subchannel.

Spatial reuse field at low 80MHz 2: In general, it may mean the spatial reuse value of the second low 40MHz subchannel.

Spatial reuse field at high 80MHz 1: In general, it may mean the spatial reuse value of the second high 40MHz subchannel.

Spatial reuse field at high 80MHz 2: In general, it may mean the highest spatial reuse value of a 40MHz subchannel.

3.4.5 spatial reuse field design at BW = 320MHz

TB PPDU transmission in the 5/6 GHz band may be considered.

First, the composition of the spatial reuse field in the case where the 320MHz channelization can be specified in an additional way under the assumption of BW2 or BW1 is proposed as follows.

The four spatial reuse subfields of the trigger frame can be configured as follows.

spatial reuse

The two spatial reuse fields of the TB PPDU can be configured by copying

spatial reuse fields

1 and 2 of the Trigger frame as they are. That is, it can be as follows.

spatial reuse fields

Spatial reuse field 1: In general, it may mean the spatial reuse value of the lowest or second lowest 80MHz subchannel.

Spatial reuse field 2: In general, it may mean a spatial reuse value of the highest or second highest 80MHz subchannel.

Alternatively, the two spatial reuse fields of the TB PPDU may be defined differently for each 160 MHz (that is, the U-SIG configuration may be different for each 160 MHz), and at a low 160 MHz,

spatial reuse fields

1 and 2 of the Trigger frame are copied and configured as it is. At 160 MHz, it can be configured by copying

spatial reuse fields

3 and 4 of the trigger frame as it is. That is, it can be as follows.

Spatial reuse field at low 160 MHz 1: In general, it may mean the spatial reuse value of the lowest 80 MHz subchannel.

Spatial reuse field at low 160 MHz 2: In general, it may mean the spatial reuse value of the second low 80 MHz subchannel.

Spatial reuse field at high 160MHz 1: In general, it may mean the spatial reuse value of the second high 80MHz subchannel.

Spatial reuse field at high 160 MHz 2: In general, it may mean the highest spatial reuse value of the 80 MHz subchannel.

The following is a situation in consideration of the case where 320MHz channelization cannot be specified under the assumption of BW1.

Spatial reuse field 2: Since the OBSS STA cannot specify whether the channel part it is decoding is the first 160 MHz or the second 160 MHz, it may be set to be the same as spatial reuse field 1.

Spatial reuse field 3 and spatial reuse field 4 may be set the same as spatial reuse field 1. Alternatively,

spatial reuse

The two spatial reuse fields of the TB PPDU can be configured by copying

spatial reuse fields

1 and 2 of the Trigger frame as they are. That is, it can be as follows.

Spatial reuse field 2: In general, it may mean the spatial reuse value of the second lower 80MHz subchannel. Alternatively, it may be set to the same value as spatial reuse field 1. Although the OBSS STA cannot know exactly what 80MHz the part it is decoding is at least the odd-numbered (first or third) 80MHz and the even-numbered (second or fourth) 80MHz, it can be distinguished. It may be desirable to mean the spatial reuse value of the second lower 80MHz subchannel.

Spatial reuse field 3: Since the OBSS STA does not know exactly what 80 MHz the part it is decoding is, it may be set to the same value as spatial reuse field 1.

Spatial reuse field 4: may be set to the same value as spatial reuse field 1 or spatial reuse field 2. Although the OBSS STA cannot know exactly what 80MHz the part it is decoding is at least the odd-numbered (first or third) 80MHz or even-numbered (second or fourth) 80MHz, it can be distinguished. It may be desirable to set the same value as reuse field 2.

spatial reuse fields

Spatial reuse field 2: In general, it may mean the spatial reuse value of the lowest or second lowest 80MHz subchannel.

Alternatively, the two spatial reuse fields of the TB PPDU can be configured by directly copying

spatial reuse fields

1 and 2 of the Trigger frame at a low 160 MHz, and by copying

spatial reuse fields

3 and 4 of the Trigger frame at a high 160 MHz as they are. . That is, it can be as follows.

Spatial reuse field at low 160 MHz 2: In general, it may mean the spatial reuse value of the second low 80 MHz subchannel. Alternatively, it may be set to the same value as spatial reuse field 1. Although the OBSS STA cannot know exactly what 80MHz the part it is decoding is at least the odd-numbered (first or third) 80MHz or the even-numbered (second or fourth) 80MHz, two It may be desirable to mean the spatial reuse value of the second lower 80MHz subchannel.

Spatial reuse field at high 160 MHz 1: Since the OBSS STA does not know exactly what 80 MHz the part it is decoding is, it may be set to the same value as spatial reuse field 1.

Spatial reuse field 2: spatial reuse field 1 or spatial reuse field 2 at high 160 MHz may be set to the same value. Although the OBSS STA cannot know exactly what 80MHz the part it is decoding is at least the odd-numbered (first or third) 80MHz or the even-numbered (second or fourth) 80MHz, the spatial It may be desirable to set the same value as reuse field 2.

That is, regardless of the low and high 160 MHz, spatial reuse field 1 may generally mean the spatial reuse value of the lowest 80 MHz subchannel, and spatial reuse field 2 may generally mean the spatial reuse value of the second low 80 MHz subchannel, or It may be set to the same value as spatial reuse field 1.

When triggering TB A-PPDU, method 3 and method 4 above can be mixed and used. For example, suppose that the trigger frame has 4 spatial reuse fields, the EHT TB PPDU has 2 spatial reuse fields, and the HE TB PPDU has 4 spatial reuse fields. If the bandwidth of TB A-PPDU is up to 160 MHz, as in method 4, both EHT/HE TB PPDU spatial reuse fields are configured using the four spatial reuse fields of the trigger frame. The four spatial reuse fields are configured with a value corresponding to the bandwidth of 160 MHz or HE TB PPDU, and two additional spatial reuse fields for the EHT TB PPDU may be configured.

- UL Spatial Reuse field configuration of Trigger frame and spatial reuse field configuration in EHT/HE TB PPDU

Although each configuration was explained in

methods

3 and 4 above, it can be seen that the proposal for the mapping rule is larger, so the configuration of the UL Spatial Reuse field of the Trigger frame and the configuration of the spatial reuse field in the EHT/HE TB PPDU in more detail below. I will explain how to do it.

It is assumed that the EHT TB PPDU has two spatial reuse fields and the HE TB PPDU has four spatial reuse fields.

1) Method of triggering only EHT TB PPDU 1

In case of triggering only EHT TB PPDU, a specific EHT trigger frame with a modified 802.11ax trigger frame can be used, and 4 or 2 UL Spatial Reuse fields can be configured using the existing UL Spatial Reuse field in the common info field, which is EHT TB It may be set as a value for PPDU. In the case of 4, the mapping rule of method 4 is used, and in the case of 2, the spatial reuse field of the EHT TB PPDU can be configured by using the mapping rule of method 3. However, considering the TB A-PPDU, it may be desirable to design the unified trigger frame by configuring four UL Spatial Reuse fields in the EHT trigger frame. However, since it is impossible to simultaneously indicate the spatial reuse field due to the use of different BWs and different channels of the HE TB PPDU and the EHT TB PPDU, an additional method may be required. When configuring the trigger frame in this way, information about the TB A-PPDU trigger can be loaded in the Common info field of the trigger frame, and the spatial reuse field of each EHT TB PPDU by using the information that triggers only EHT TB PPDU, not A-PPDU may be configured using the existing four UL Spatial Reuse fields.

2) Method of triggering only EHT TB PPDU 2

Alternatively, in case of triggering only EHT TB PPDU, a specific EHT trigger frame with a modified 802.11ax trigger frame may be used, and the existing 4 UL Spatial Reuse fields may be reserved in the common info field and common for EHT TB PPDU using a special AID. Two UL Spatial Reuse fields for this may exist in the special user info field constituting the info field. Alternatively, two UL Spatial Reuse fields for EHT TB PPDU may be indicated by using a specific field within the common info field (such as UL HE-SIG-A2 Reserved field).

Considering the TB A-PPDU trigger, the method that can maintain the unified form as a whole may be advantageous. However, when only EHT TB PPDU is triggered, there is a disadvantage that the existing 4 UL Spatial Reuse fields in the common info field can be wasted.

3) TB A-PPDU trigger method 1

Basically, when only EHT TB PPDU is triggered, method 1 of triggering only EHT TB PPDU is assumed.

When triggering TB A-PPDU, there may be 4 UL Spatial Reuse fields set as values for HE TB PPDU in the common info field of the trigger frame, and special AID to configure the common info field for EHT TB PPDU In the user info field, two UL Spatial Reuse fields set to a value for this may exist. Alternatively, two UL Spatial Reuse fields for the EHT TB PPDU may be indicated by using a specific field within the common info field instead of the User info field using a special AID (such as UL HE-SIG-A2 Reserved field).

The HE terminal (or the EHT terminal transmitting the HE TB PPDU) may configure the spatial reuse field of the HE TB PPDU by using four UL Spatial Reuse fields in the common info field of the trigger frame as in the operation of the existing 802.11ax.

On the other hand, the EHT terminal transmitting the EHT TB PPDU (indicator of whether the EHT terminal will transmit the HE TB PPDU or the EHT TB PPDU is displayed in the user info field of the trigger frame (user info field indicating the corresponding AID of each EHT terminal). First, using the four UL Spatial Reuse fields in the common info field of the trigger frame, two spatial reuse fields of the EHT TB PPDU can be configured in the same way as the mapping rule of method 4 (this is the EHT TB PPDU In the case of triggering only the EHT TB PPDU only, since method 1 is assumed to trigger only the EHT TB PPDU, the 4 UL Spatial Reuse fields in the common info field of the trigger frame are values for HE, but are these values still for HE? cognitive distinction is not possible). After that, when it is confirmed that the special user info field exists or it is confirmed that two UL Spatial Reuse fields exist in the common info field (UL HE-SIG-A2 Reserved field is originally set to all 1 in 802.11ax, and this is If it is confirmed that it is set to a value), two spatial reuse fields of the EHT TB PPDU previously set can be reconstructed in the same way as the mapping rule of method 3 using the two UL Spatial Reuse fields therein. However, among EHT terminals, the HE TB PPDU may be transmitted by the trigger frame. In this case, the EHT terminals use the four UL Spatial Reuse fields in the common info field of the trigger frame like the HE terminal to configure the spatial reuse field of the HE TB PPDU. can The indicator of whether the EHT terminal transmits the HE TB PPDU or the EHT TB PPDU may be performed in the user info field (user info field indicating the corresponding AID of each EHT terminal) of the trigger frame.

Additionally, information for triggering TB A-PPDU may be loaded in the Common info field of the trigger frame, and the EHT terminal that transmits the EHT TB PPDU using the information that triggers the TB A-PPDU is There is no need to use the UL Spatial Reuse field, and it is always possible to use two UL Spatial Reuse fields in the special user info field or two new UL Spatial Reuse fields in the common info field. Conversely, if there is no information that triggers the TB A-PPDU, that is, when receiving information that only triggers the EHT TB PPDU, the EHT terminal transmitting the EHT TB PPDU uses the four UL Spatial Reuse fields in the common info field to determine the spatial resolution of the EHT TB PPDU. A reuse field can be configured.

This method may be a method to minimize overhead, but may require complex receiver behavior.

4) TB A-PPDU trigger method 2

Basically, when only EHT TB PPDU is triggered, method 2 of triggering only EHT TB PPDU is assumed.

As in TB A-PPDU trigger method 1, there may be 4 UL Spatial Reuse fields set as values for HE TB PPDU in the common info field of the trigger frame, and a special AID is used to configure the common info field for EHT TB PPDU. In the special user info field, there may be two UL Spatial Reuse fields set as values for this, or by using a specific field in the common info field instead of the User info field using a special AID (UL HE-SIG-A2 Reserved field) etc.) may indicate two UL Spatial Reuse fields for EHT TB PPDU. However, it is different from the TB A-PPDU trigger method 1 in that the EHT terminal transmitting the EHT TB PPDU always knows that information on its own spatial reuse field is included in the other two UL Spatial Reuse fields in the trigger frame.

That is, the UE transmitting the HE TB PPDU among EHT UEs can configure the spatial reuse field of the HE TB PPDU by using the four UL Spatial Reuse fields in the common info field of the trigger frame like the HE UE, and transmits the EHT TB PPDU. The UE can directly use two UL Spatial Reuse fields in the special user info field constituting the common info field for the EHT TB PPDU using the special AID without using this, or it is indicated using a specific field within the common info field. The spatial reuse field of the EHT TB PPDU can be configured by directly using the two UL Spatial Reuse fields. The indicator of whether the EHT terminal transmits the HE TB PPDU or the EHT TB PPDU may be performed in the user info field (user info field indicating the corresponding AID of each EHT terminal) of the trigger frame.

This method always has a unified structure, but if only EHT TB PPDU is triggered, the existing 4 UL Spatial Reuse fields in the common info field may be wasted.

5) TB A-PPDU trigger method 3

When triggering the TB A-PPDU, a case in which terminals transmitting the HE TB PPDU (HE or EHT terminals) and the terminals transmitting the EHT TB PPDU using subchannel selective transmission (SST) are allocated to different channels should also be considered. can In this case, different trigger frames may be transmitted to each channel. That is, the existing 802.11ax trigger frame can be used for the channel triggering the HE TB PPDU, and the above EHT TB PPDU triggering method 1 or EHT TB PPDU only triggering method 2 can be used for the EHT TB PPDU triggering channel. . From an overhead point of view, it may be advantageous to use method 1 that triggers only EHT TB PPDU.

It may be advantageous from the viewpoint of overhead or receiver implementation, but TB A-PPDU can be configured only when SST is always used.

Below is the SST of 802.11ax, and this method can be extended and used in 802.11be.

The HE STA supporting the HE SST operation must set dot11HESbchannelSelectiveTransmissionImplemented to true and set the HE Subchannel selective transmission support field of the HE Capabilities element it transmits to 1.

The HE STA that does not support the HE SST operation shall set the HE Subchannel Selective Transmission Support field to 0 in the HE Capabilities element transmitted by it.

Target wake time (TWT) allows the AP to manage activity in the BSS to minimize contention between STAs and reduce the time required for STAs using power saving mode to stay awake. This is achieved by allocating STAs to operate at non-overlapping times and/or frequencies and focusing frame exchanges on predefined service periods. The HE STA negotiates individual TWT agreements with other HE STAs.

The HE SST non-AP STA and the HE SST AP may set the SST operation by negotiating the trigger activation TWT defined in the individual TWT contract, except for the following.

- The TWT request may have a TWT channel field with a maximum of 1 bit set to 1 to indicate a secondary channel requested to include an RU assignment addressed to a HE SST non-AP STA that is a 20 MHz operating STA.

- The TWT request is to indicate whether the primary 80MHz channel or the secondary 80MHz channel is requested to include the RU assignment addressed to the HE SST non-AP STA, which is the 80MHz operating STA. It may have a configured TWT channel field.

- The TWT response shall have a TWT channel field with a maximum of 1 bit set to 1 to indicate the secondary channel that will contain the RU assignment addressed to the HE SST non-AP STA, which is a 20 MHz operating STA.

- The TWT response includes all four LSBs or all four MSBs indicating whether the primary 80 MHz channel or the secondary 80 MHz channel includes the RU assignment addressed to the HE SST non-AP STA that is the 80 MHz operating STA. should have

HE SST AP and HE SST non-AP STA implicitly terminate the trigger activation TWT if the working channel or channel width is changed due to the HE SST AP and the secondary channel of the trigger activated TWT is not within the new operating channel or channel width .

The HE SST non-AP STA follows the rules of the individual TWT contract to exchange frames with the HE SST AP during trigger activation TWT SP. However, the following conditions are excluded.

- The STA shall be available on the subchannel indicated in the TWT channel field of the TWT response at the TWT start time.

- The STA shall not use DCF or EDCAF to access the medium of the sub-channel.

- The STA shall not respond to a trigger frame addressed to it unless it performs CCA until a frame capable of setting NAV is detected, or until a period equal to NAVSyncDelay occurs (whichever is earlier)

- When the STA receives a PPDU in a subchannel, it must update the NAV according to two NAV updates.

That is, according to the SST mechanism, the HE SST AP and the HE SST non-AP STA may access a specific subchannel (or secondary channel) during the trigger-enabled TWT SP.

In the above three TB A-PPDU trigger methods (TB A-PPDU trigger methods 1 to 3), the four spatial reuse fields in the common field of the trigger frame are for the bandwidth of only the HE TB PPDU (that is, the total bandwidth of the TB A-PPDU) Regardless, it can be set to a value (considering only the bandwidth over which the HE TB PPDU is transmitted) can It may be desirable to consider only the bandwidth in which the former EHT TB PPDU is transmitted.

The example of FIG. 22 may be performed by a transmitting STA or a transmitting apparatus (AP and/or non-AP STA).

Some of each step (or detailed sub-step to be described later) of the example of FIG. 22 may be omitted or changed.

Through step S2210, the transmitting device (transmitting STA) may obtain (obtain) information about the above-described tone plan. As described above, the information about the tone plan includes the size and location of the RU, control information related to the RU, information about the frequency band including the RU, information about the STA receiving the RU, and the like.

In step S2220, the transmitting device 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 the EHT-SIG field including control information about the tone plan. That is, in step S2220, the step of configuring a field including control information (eg, N bitmap) indicating the size/position 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.

The transmitting device may transmit the PPDU configured in step S2220 to the receiving device based on step S1830.

While performing step S2230, the transmitting device may perform at least one of CSD, spatial mapping, IDFT/IFFT operation, GI insertion, and the like.

A signal/field/sequence constructed according to this specification may be transmitted in the form of FIG. 10 .

The above-described PPDU may be received according to the example of FIG. 22 .

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

Some of each step (or detailed sub-step to be described later) of the example of FIG. 23 may be omitted.

The receiving device (receiving STA) may receive all or part of the PPDU through step S2310. The received signal may be in the form of FIG. 10 .

The sub-step of step S2310 may be determined based on step S2230 of FIG. 22 . That is, in step S2310, an operation for restoring the results of the CSD, spatial mapping, IDFT/IFFT operation, and GI insert operation applied in step S2230 may be performed.

In step S2320, the receiving device may perform decoding on all/part of the PPDU. In addition, the receiving device may obtain control information related to the tone plan (ie, RU) 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 may obtain information included in the L-SIG and EHT SIG fields. Information on various tone plans (ie, RUs) described in this specification may be included in the EHT-SIG, and the receiving STA may acquire information about the tone plans (ie, RUs) through the EHT-SIG.

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

In addition, the receiving device may perform a processing operation of transferring the decoded data to a higher layer (eg, MAC layer) in step S2330. In addition, when generation of a signal is instructed from the upper layer to the PHY layer in response to data transferred 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 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 improved from the 802.11ax system, and may satisfy backward compatibility with the 802.11ax system.

The example of FIG. 24 is performed in a transmitting station (STA), and the transmitting STA may correspond to an access point (AP) STA. The receiving STA of FIG. 24 may correspond to a non-AP STA.

In step S2410, the transmitting STA (station) transmits a trigger frame to the receiving STA through a preset frequency band.

In step S2420, the transmitting STA receives a TB Trigger Based Physical Protocol Data Unit (TB PPDU) from the receiving STA.

The trigger frame includes first to fourth spatial reuse fields.

The TB PPDU includes fifth and sixth spatial reuse fields.

When the preset frequency band is a 20 MHz band, the first to fourth spatial reuse fields may include the same spatial reuse value for the 20 MHz band. The fifth spatial reuse field is constructed by duplicating the first spatial reuse field. The sixth spatial reuse field is constructed by duplicating the second spatial reuse field. That is, the spatial reuse field included in the TB PPDU may use the value of the spatial reuse field included in the trigger frame as it is.

According to this embodiment, the transmitting STA notifies the OBSS STA of an allowable transmit power value (or an interference-free transmit power value) for a specific band (or a specific channel) through the spatial reuse value, and the OBSS STA A signal may be transmitted by calculating and adjusting the transmission power by performing spatial reuse in a specific band (or a specific channel). When the OBSS STA adjusts the transmit power, the transmitting STA may not receive interference due to the OBSS STA when receiving the TB PPDU. That is, the present embodiment has an effect that transmission resources for a specific band can be used stably without collision.

When the TB PPDU is transmitted in the 2.4 GHz band, the spatial reuse value of the second 20 MHz subchannel may be set to be the same as the spatial reuse value of the first 20 MHz subchannel. This is because 40 MHz channels overlap in the 2.4 GHz band, so it is not possible to determine which 20 MHz sub-channel of which 40 MHz channel the OBSS STA that decoded the TB PPDU in a specific 20 MHz sub-channel used, so it is simply set to the same value will be.

When the preset frequency band is an 80 MHz band, the first spatial reuse field may include a spatial reuse value of a third 20 MHz subchannel having the lowest frequency in the 80 MHz band. The second spatial reuse field may include a spatial reuse value of a fourth 20MHz subchannel having the second lowest frequency in the 80MHz band. The third spatial reuse field may include a spatial reuse value of a fifth 20 MHz subchannel having the second highest frequency in the 80 MHz band. The fourth spatial reuse field may include a spatial reuse value of a sixth 20MHz subchannel having the highest frequency in the 80MHz band. The fifth spatial reuse field may include a smaller value of a spatial reuse value of the third 20 MHz subchannel or a spatial reuse value of the fourth 20 MHz subchannel. The sixth spatial reuse field may include a smaller value of a spatial reuse value of the fifth 20 MHz subchannel or a spatial reuse value of the sixth 20 MHz subchannel.

In this case, the spatial reuse value of the third 20 MHz subchannel is a value used to calculate transmission power that can allow an OBSS STA access to the third 20 MHz subchannel, and the spatial reuse of the fourth 20 MHz subchannel The value may be a value used to calculate transmit power that can allow an OBSS STA to access the fourth 20 MHz subchannel. The spatial reuse value of the 5th 20MHz subchannel is a value used to calculate transmit power that can allow an OBSS STA access to the 5th 20MHz subchannel, and the spatial reuse value of the 6th 20MHz subchannel is It may be a value used to calculate transmission power that can allow an OBSS STA to access the sixth 20 MHz subchannel.

When the preset frequency band is a 160 MHz band, the first spatial reuse field may include a spatial reuse value of a first 40 MHz subchannel having the lowest frequency in the 160 MHz band. The second spatial reuse field may include a spatial reuse value of a second 40MHz subchannel having the second lowest frequency in the 160MHz band. The third spatial reuse field may include a spatial reuse value of a third 40MHz subchannel having the second highest frequency in the 160MHz band. The fourth spatial reuse field may include a spatial reuse value of a fourth 40MHz subchannel having the highest frequency in the 160MHz band. The fifth spatial reuse field may include a smaller value of the spatial reuse value of the first 40MHz subchannel or the spatial reuse value of the second 40MHz subchannel. The sixth spatial reuse field may include a smaller value of a spatial reuse value of the third 40MHz subchannel or a spatial reuse value of the fourth 40MHz subchannel.

In this case, the spatial reuse value of the first 40 MHz subchannel is a value used to calculate transmit power that can allow an OBSS STA access to the first 40 MHz subchannel, and the spatial reuse value of the second 40 MHz subchannel The value may be a value used to calculate transmission power that can allow an OBSS STA to access the second 40 MHz subchannel. The spatial reuse value of the third 40 MHz subchannel is a value used to calculate transmit power that can allow an OBSS STA access to the third 40 MHz subchannel, and the spatial reuse value of the fourth 40 MHz subchannel is It may be a value used to calculate transmit power that can allow an OBSS STA to access the fourth 40 MHz subchannel.

When the preset frequency band is a 320 MHz band, the first spatial reuse field may include a spatial reuse value of a first 80 MHz subchannel having the lowest frequency in the 320 MHz band. The second spatial reuse field may include a spatial reuse value of a second 80MHz subchannel having the second lowest frequency in the 320MHz band. The third spatial reuse field may include a spatial reuse value of a third 80MHz subchannel having the second highest frequency in the 320MHz band. The fourth spatial reuse field may include a spatial reuse value of a fourth 80MHz subchannel having the highest frequency in the 320MHz band. The fifth spatial reuse field may include a smaller value of the spatial reuse value of the first 80MHz subchannel or the spatial reuse value of the second 80MHz subchannel. The sixth spatial reuse field may include the smaller of the spatial reuse value of the third 80MHz subchannel or the spatial reuse value of the fourth 80MHz subchannel.

In this case, the spatial reuse value of the first 80 MHz subchannel is a value used to calculate transmission power that can allow an OBSS STA access to the first 80 MHz subchannel, and the spatial reuse of the second 80 MHz subchannel The value may be a value used to calculate transmission power that can allow an OBSS STA to access the second 80MHz subchannel. The spatial reuse value of the third 80MHz subchannel is a value used to calculate transmit power that can allow an OBSS STA access to the third 80MHz subchannel, and the spatial reuse value of the fourth 80MHz subchannel is It may be a value used to calculate a transmission power that can allow an OBSS STA to access the fourth 80 MHz subchannel.

The first to fourth spatial reuse fields may be included in an uplink spatial reuse field of the common information field of the trigger frame. The fifth and sixth spatial reuse fields may be included in a Universal-Signal (U-SIG) field of the TB PPDU.

Hereinafter, a method of configuring the space reuse field of the TB APPDU will be described.

For example, when the TB PPDU is a Trigger Based Aggregated-Physical Protocol Data Unit (TB APPDU) in which a High Efficiency (HE) TB PPDU and an Extreme High Throughput (EHT) TB PPDU are aggregated, the common information field of the trigger frame may include a special user information field.

The special user information field may include seventh and eighth spatial reuse fields. The HE TB PPDU may include ninth to twelfth spatial reuse fields. The EHT TB PPDU may include the fifth and sixth spatial reuse fields.

In the seventh and eighth spatial reuse fields, a mapped channel may vary according to a transmission band of the EHT TB PPDU.

For example, when the transmission band of the EHT TB PPDU is a 20 MHz band, the seventh to eighth spatial reuse fields may include the same spatial reuse value for the 20 MHz band. When the transmission band of the EHT TB PPDU is a 40 MHz band, the seventh spatial reuse field includes a spatial reuse value of a first 20 MHz subchannel having a low frequency in the 40 MHz band. The eighth spatial reuse field includes a spatial reuse value of a second 20MHz subchannel having a high frequency in the 40MHz band. When the transmission band of the EHT TB PPDU is an 80 MHz band, the seventh spatial reuse field may include a spatial reuse value of a first 40 MHz subchannel having a low frequency in the 80 MHz band. The eighth spatial reuse field may include a spatial reuse value of a second 40MHz subchannel having a high frequency in the 80MHz band. When the transmission band of the EHT TB PPDU is a 160 MHz band, the seventh spatial reuse field may include a spatial reuse value of a first 80 MHz subchannel having a low frequency in the 160 MHz band. The eighth spatial reuse field may include a spatial reuse value of a second 80MHz subchannel having a high frequency in the 160MHz band. When the transmission band of the EHT TB PPDU is a 320 MHz band, the seventh spatial reuse field may include a spatial reuse value of a first 160 MHz subchannel having a low frequency in the 320 MHz band. The eighth spatial reuse field may include a spatial reuse value of a second 160 MHz subchannel having a high frequency in the 320 MHz band.

In addition, when the EHT TB PPDU is transmitted in a 40 MHz band of a 2.4 GHz band, the value of the eighth spatial reuse field may be set to be the same as the value of the seventh spatial reuse field.

In this case, the fifth spatial reuse field may be configured by duplicating the seventh spatial reuse field, and the sixth spatial reuse field may be configured by duplicating the eighth spatial reuse field. The ninth spatial reuse field may be configured by duplicating the first spatial reuse field, and the tenth spatial reuse field may be configured by duplicating the second spatial reuse field. The eleventh spatial reuse field may be configured by duplicating the third spatial reuse field, and the twelfth spatial reuse field may be configured by duplicating the fourth spatial reuse field. That is, when the trigger frame triggers the TB APPDU, the spatial reuse field of the trigger frame may be mapped to the spatial reuse field of the TB APPDU as described above.

In addition, when the trigger frame triggers the TB APPDU, STAs (HE STA or EHT STA) that transmit the HE TB PPDU using Subchannel Selective Transmission (SST) and STAs that transmit the EHT TB PPDU (EHT STAs) ) may also be considered in which it is allocated to different channels. In this case, different trigger frames may be transmitted to each channel.

As another example, when the TB PPDU includes only the EHT TB PPDU, the first to fourth spatial reuse fields may be reserved. The common information field of the trigger frame may include a special user information field.

The special user information field may include seventh and eighth spatial reuse fields. The fifth spatial reuse field may be configured by duplicating the seventh spatial reuse field, and the sixth spatial reuse field may be configured by duplicating the eighth spatial reuse field. That is, when the trigger frame triggers only the EHT TB PPDU, the spatial reuse field of the trigger frame may be mapped to the spatial reuse field of the EHT TB PPDU as described above.

Each of the first to twelfth spatial reuse fields is composed of a 4-bit field. That is, the spatial reuse values of the first to twelfth spatial reuse fields may be indicated by 4 bits according to Table 3 above.

The trigger frame may be divided into a case of an HE variant and a case of an EHT variant, and the common information field and the user information field may be configured differently (refer to FIGS. 16 and 17 for the common information field). The TB PPDU may be an EHT TB PPDU, wherein the EHT TB PPDU is a Legacy-Short Training Field (L-STF), a Legacy-Long Training Field (L-LTF), a Legacy-Signal (L-SIG), and a RL-SIG. (Repeated L-SIG), U-SIG (Universal-Signal), EHT-STF and EHT-LTFs, and data fields may be included. That is, the EHT TB PPDU is defined in a format except for the EHT-SIG in the EHT MU PPDU.

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 improved from the 802.11ax system, and may satisfy backward compatibility with the 802.11ax system.

The example of FIG. 25 is performed by a receiving STA (station), and the receiving STA may correspond to a non-AP STA. The transmitting STA of FIG. 25 may correspond to an access point (AP) STA.

In step S2510, the receiving STA (station) receives a trigger frame through a preset frequency band from the transmitting STA.

In step S2520, the receiving STA transmits a TB Trigger Based Physical Protocol Data Unit (TB PPDU) to the transmitting STA.

The trigger frame includes first to fourth spatial reuse fields.

The TB PPDU includes fifth and sixth spatial reuse fields.

4. 장치 구성4. Device configuration

The technical features of the present specification described above may be applied to various devices and methods. For example, the above-described technical features of the present specification may be performed/supported through the apparatus of FIGS. 1 and/or 11 . For example, the technical features of the present specification described above may be applied only to a part of FIGS. 1 and/or 11 . For example, the technical features of the present specification described above are 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 , or , may be implemented based on the processor 610 and the memory 620 of FIG. 11 . For example, the apparatus of the present specification may receive a trigger frame through a preset frequency band from a transmitting STA (station); and transmits a TB Trigger Based Physical Protocol Data Unit (TB PPDU) to the transmitting STA.

The technical features of the present specification may be implemented based on a CRM (computer readable medium). For example, CRM proposed by the present specification is at least one computer readable medium including at least one computer readable medium including instructions based on being executed by at least one processor.

The CRM may include: receiving a trigger frame from a transmitting STA (station) through a preset frequency band; and transmitting a TB Trigger Based Physical Protocol Data Unit (TB PPDU) to the transmitting STA. The instructions stored in the CRM of the present specification may be executed by at least one processor. At least one processor related to CRM in the present specification may be the

processors

111 and 121 or the

processing chips

114 and 124 of FIG. 1 , or the processor 610 of FIG. 11 . Meanwhile, the CRM of the present specification may be the

memories

112 and 122 of FIG. 1 , the memory 620 of FIG. 11 , or a separate external memory/storage medium/disk.

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

Artificial intelligence refers to a field that studies artificial intelligence or methodologies that can create it, and machine learning refers to a field that defines various problems dealt with in the field of artificial intelligence and studies methodologies to solve them. do. Machine learning is also defined as an algorithm that improves the performance of a certain task through constant experience.

An artificial neural network (ANN) is a model used in machine learning, and may refer to an overall model having problem-solving ability, which is composed of artificial neurons (nodes) that form a network by combining synapses. An artificial neural network may be defined by a connection pattern between neurons of different layers, a learning process that updates model parameters, and an activation function that generates 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 the artificial neural network, each neuron may output a function value of an activation function for input signals, weights, and biases input through synapses.

Model parameters refer to parameters determined through learning, and include the weight of synaptic connections and the bias of neurons. In addition, the hyperparameter refers to a parameter that must be set before learning in a machine learning algorithm, and includes a learning rate, the number of iterations, a mini-batch size, an initialization function, and the like.

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

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

Supervised learning refers to a method of training an artificial neural network in a state where a label for the training data is given, and the label is the correct answer (or result value) that the artificial neural network should infer when the training data is input to the artificial neural network. can mean Unsupervised learning may refer to a method of training an artificial neural network in a state where no labels are given for training data. Reinforcement learning can refer to a learning method in which an agent defined in an environment learns to select an action or sequence of actions 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 also called deep learning (deep learning), and deep learning is a part of machine learning. Hereinafter, machine learning is used in a sense including deep learning.

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

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

Robots can be classified into industrial, medical, home, 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 the robot joints. In addition, the movable robot includes a wheel, a brake, a propeller, and the like in the driving unit, and may 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 is a generic term for virtual reality (VR), augmented reality (AR), and mixed reality (MR). VR technology provides only CG images of objects or backgrounds in the real world, AR technology provides virtual CG images on top of images of real objects, and MR technology is a computer that mixes and combines virtual objects in the real world. graphic technology.

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

XR technology can be applied to HMD (Head-Mount Display), HUD (Head-Up Display), mobile phone, tablet PC, laptop, desktop, TV, digital signage, etc. can be called

The claims described herein may be combined in various ways. For example, the technical features of the method claims of the present specification may be combined and implemented as an apparatus, and the technical features of the apparatus claims of the present specification may be combined and implemented as a method. In addition, the technical features of the method claim of the present specification and the technical features of the apparatus claim may be combined to be implemented as an apparatus, and the technical features of the method claim and the technical features of the apparatus claim of the present specification may be combined and implemented as a method.

Claims

In a wireless LAN system,

receiving, by a receiving STA (station), a trigger frame from a transmitting STA through a preset frequency band; and

Comprising the step of transmitting, by the receiving STA, a TB Trigger Based Physical Protocol Data Unit (TB PPDU) to the transmitting STA,

The trigger frame includes first to fourth spatial reuse (Spatial Reuse) fields,

The TB PPDU includes fifth and sixth spatial reuse fields,

When the preset frequency band is a 40 MHz band,

The first and third spatial reuse fields include spatial reuse values of a first 20 MHz subchannel having a low frequency in the 40 MHz band,

The second and fourth spatial reuse fields include spatial reuse values of a second 20 MHz subchannel having a high frequency in the 40 MHz band,

The fifth spatial reuse field is constructed by duplicating the first spatial reuse field, and

The sixth spatial reuse field is configured by duplicating the second spatial reuse field.

method.
According to claim 1,

When the preset frequency band is a 20 MHz band,

The first to fourth spatial reuse fields include the same spatial reuse value for the 20 MHz band,

The fifth spatial reuse field is configured by duplicating the first spatial reuse field,

The sixth spatial reuse field is configured by duplicating the second spatial reuse field.

method.
According to claim 1,

When the TB PPDU is transmitted in the 2.4 GHz band, the spatial reuse value of the second 20 MHz subchannel is set equal to the spatial reuse value of the first 20 MHz subchannel;

The spatial reuse value of the first 20 MHz subchannel is a value used to calculate transmission power that can allow access of an overlapping basic service set (OBSS) STA for the first 20 MHz subchannel,

The spatial reuse value of the second 20 MHz subchannel is a value used to calculate transmission power that can allow an OBSS STA access to the second 20 MHz subchannel.

method.
According to claim 1,

When the preset frequency band is an 80 MHz band,

The first spatial reuse field includes a spatial reuse value of a third 20 MHz subchannel having the lowest frequency in the 80 MHz band,

The second spatial reuse field includes a spatial reuse value of a fourth 20MHz subchannel having the second lowest frequency in the 80MHz band,

The third spatial reuse field includes a spatial reuse value of a fifth 20 MHz subchannel having the second highest frequency in the 80 MHz band,

The fourth spatial reuse field includes a spatial reuse value of a sixth 20 MHz subchannel having the highest frequency in the 80 MHz band,

The fifth spatial reuse field includes the smaller of the spatial reuse value of the third 20 MHz subchannel or the spatial reuse value of the fourth 20 MHz subchannel;

The sixth spatial reuse field includes the smaller of the spatial reuse value of the fifth 20 MHz subchannel or the spatial reuse value of the sixth 20 MHz subchannel.

method.
According to claim 1,

When the preset frequency band is a 160 MHz band,

The first spatial reuse field includes a spatial reuse value of a first 40 MHz subchannel having the lowest frequency in the 160 MHz band,

The second spatial reuse field includes a spatial reuse value of a second 40MHz subchannel having the second lowest frequency in the 160MHz band,

The third spatial reuse field includes a spatial reuse value of a third 40MHz subchannel having the second highest frequency in the 160MHz band,

The fourth spatial reuse field includes a spatial reuse value of a fourth 40 MHz subchannel having the highest frequency in the 160 MHz band,

the fifth spatial reuse field includes the smaller of the spatial reuse value of the first 40MHz subchannel or the spatial reuse value of the second 40MHz subchannel;

The sixth spatial reuse field includes the smaller of the spatial reuse value of the third 40 MHz subchannel or the spatial reuse value of the fourth 40 MHz subchannel

method.
According to claim 1,

When the preset frequency band is a 320 MHz band,

The first spatial reuse field includes a spatial reuse value of a first 80MHz subchannel having the lowest frequency in the 320MHz band,

The second spatial reuse field includes a spatial reuse value of a second 80MHz subchannel having the second lowest frequency in the 320MHz band,

The third spatial reuse field includes a spatial reuse value of a third 80MHz subchannel having the second highest frequency in the 320MHz band,

The fourth spatial reuse field includes a spatial reuse value of a fourth 80MHz subchannel having the highest frequency in the 320MHz band,

The fifth spatial reuse field includes the smaller of the spatial reuse value of the first 80MHz subchannel or the spatial reuse value of the second 80MHz subchannel;

The sixth spatial reuse field includes the smaller of the spatial reuse value of the third 80MHz subchannel or the spatial reuse value of the fourth 80MHz subchannel

method.
According to claim 1,

The first to fourth spatial reuse fields are included in an Uplink Spatial Reuse field of the common information field of the trigger frame,

The fifth and sixth spatial reuse fields are included in the U-SIG (Universal-Signal) field of the TB PPDU.

method.
According to claim 1,

When the TB PPDU is a Trigger Based Aggregated-Physical Protocol Data Unit (TB APPDU) in which a High Efficiency (HE) TB PPDU and an Extreme High Throughput (EHT) TB PPDU are aggregated,

The common information field of the trigger frame includes a special user information field,

The special user information field includes seventh and eighth space reuse fields,

The HE TB PPDU includes 9th to 12th spatial reuse fields,

The EHT TB PPDU includes the fifth and sixth spatial reuse fields

method.
9. The method of claim 8,

The fifth spatial reuse field is constructed by duplicating the seventh spatial reuse field,

The sixth spatial reuse field is configured by duplicating the eighth spatial reuse field,

The ninth spatial reuse field is configured by duplicating the first spatial reuse field,

The tenth spatial reuse field is constructed by duplicating the second spatial reuse field,

The eleventh spatial reuse field is configured by duplicating the third spatial reuse field,

The twelfth spatial reuse field is configured by duplicating the fourth spatial reuse field.

method.
According to claim 1,

When the TB PPDU includes only the EHT TB PPDU,

The first to fourth spatial reuse fields are reserved,

The common information field of the trigger frame includes a special user information field,

The special user information field includes seventh and eighth space reuse fields,

The fifth spatial reuse field is constructed by duplicating the seventh spatial reuse field, and

The sixth spatial reuse field is configured by duplicating the eighth spatial reuse field.

method.
In a wireless LAN system, a receiving STA (station) is

Memory;

transceiver; and

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

receive a trigger frame through a preset frequency band from the transmitting STA; and

Transmitting a TB PPDU (Trigger Based Physical Protocol Data Unit) to the transmitting STA,

The trigger frame includes first to fourth spatial reuse (Spatial Reuse) fields,

The TB PPDU includes fifth and sixth spatial reuse fields,

When the preset frequency band is a 40 MHz band,

The first and third spatial reuse fields include spatial reuse values of a first 20 MHz subchannel having a low frequency in the 40 MHz band,

The second and fourth spatial reuse fields include spatial reuse values of a second 20 MHz subchannel having a high frequency in the 40 MHz band,

The fifth spatial reuse field is constructed by duplicating the first spatial reuse field, and

The sixth spatial reuse field is configured by duplicating the second spatial reuse field.

Receiving STA.
In a wireless LAN system,

transmitting, by a transmitting STA (station), a trigger frame to a receiving STA through a preset frequency band; and

Receiving, by the transmitting STA, a TB Trigger Based Physical Protocol Data Unit (TB PPDU) from the receiving STA,

The trigger frame includes first to fourth spatial reuse (Spatial Reuse) fields,

The TB PPDU includes fifth and sixth spatial reuse fields,

When the preset frequency band is a 40 MHz band,

The first and third spatial reuse fields include spatial reuse values of a first 20 MHz subchannel having a low frequency in the 40 MHz band,

The second and fourth spatial reuse fields include spatial reuse values of a second 20 MHz subchannel having a high frequency in the 40 MHz band,

The fifth spatial reuse field is constructed by duplicating the first spatial reuse field, and

The sixth spatial reuse field is configured by duplicating the second spatial reuse field.

method.
13. The method of claim 12,

When the preset frequency band is a 20 MHz band,

The first to fourth spatial reuse fields include the same spatial reuse value for the 20 MHz band,

The fifth spatial reuse field is configured by duplicating the first spatial reuse field,

The sixth spatial reuse field is configured by duplicating the second spatial reuse field.

method.
13. The method of claim 12,

When the TB PPDU is transmitted in the 2.4 GHz band, the spatial reuse value of the second 20 MHz subchannel is set equal to the spatial reuse value of the first 20 MHz subchannel;

The spatial reuse value of the first 20 MHz subchannel is a value used to calculate transmission power that can allow access of an overlapping basic service set (OBSS) STA for the first 20 MHz subchannel,

The spatial reuse value of the second 20 MHz subchannel is a value used to calculate transmission power that can allow an OBSS STA access to the second 20 MHz subchannel.

method.
13. The method of claim 12,

When the preset frequency band is an 80 MHz band,

The first spatial reuse field includes a spatial reuse value of a third 20 MHz subchannel having the lowest frequency in the 80 MHz band,

The second spatial reuse field includes a spatial reuse value of a fourth 20MHz subchannel having the second lowest frequency in the 80MHz band,

The third spatial reuse field includes a spatial reuse value of a fifth 20 MHz subchannel having the second highest frequency in the 80 MHz band,

The fourth spatial reuse field includes a spatial reuse value of a sixth 20 MHz subchannel having the highest frequency in the 80 MHz band,

The fifth spatial reuse field includes the smaller of the spatial reuse value of the third 20 MHz subchannel or the spatial reuse value of the fourth 20 MHz subchannel;

The sixth spatial reuse field includes the smaller of the spatial reuse value of the fifth 20 MHz subchannel or the spatial reuse value of the sixth 20 MHz subchannel.

method.
13. The method of claim 12,

When the preset frequency band is a 160 MHz band,

The first spatial reuse field includes a spatial reuse value of a first 40 MHz subchannel having the lowest frequency in the 160 MHz band,

The second spatial reuse field includes a spatial reuse value of a second 40MHz subchannel having the second lowest frequency in the 160MHz band,

The third spatial reuse field includes a spatial reuse value of a third 40MHz subchannel having the second highest frequency in the 160MHz band,

The fourth spatial reuse field includes a spatial reuse value of a fourth 40 MHz subchannel having the highest frequency in the 160 MHz band,

the fifth spatial reuse field includes the smaller of the spatial reuse value of the first 40MHz subchannel or the spatial reuse value of the second 40MHz subchannel;

The sixth spatial reuse field includes the smaller of the spatial reuse value of the third 40MHz subchannel or the spatial reuse value of the fourth 40MHz subchannel

method.
13. The method of claim 12,

When the preset frequency band is a 320 MHz band,

The first spatial reuse field includes a spatial reuse value of a first 80MHz subchannel having the lowest frequency in the 320MHz band,

The second spatial reuse field includes a spatial reuse value of a second 80MHz subchannel having the second lowest frequency in the 320MHz band,

The third spatial reuse field includes a spatial reuse value of a third 80MHz subchannel having the second highest frequency in the 320MHz band,

The fourth spatial reuse field includes a spatial reuse value of a fourth 80MHz subchannel having the highest frequency in the 320MHz band,

The fifth spatial reuse field includes the smaller of the spatial reuse value of the first 80MHz subchannel or the spatial reuse value of the second 80MHz subchannel;

The sixth spatial reuse field includes the smaller of the spatial reuse value of the third 80MHz subchannel or the spatial reuse value of the fourth 80MHz subchannel

method.
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:

transmit a trigger frame to the receiving STA through a preset frequency band; and

Receiving a TB PPDU (Trigger Based Physical Protocol Data Unit) from the receiving STA,

The trigger frame includes first to fourth spatial reuse (Spatial Reuse) fields,

The TB PPDU includes fifth and sixth spatial reuse fields,

When the preset frequency band is a 40 MHz band,

The first and third spatial reuse fields include spatial reuse values of a first 20 MHz subchannel having a low frequency in the 40 MHz band,

The second and fourth spatial reuse fields include spatial reuse values of a second 20 MHz subchannel having a high frequency in the 40 MHz band,

The fifth spatial reuse field is constructed by duplicating the first spatial reuse field, and

The sixth spatial reuse field is configured by duplicating the second spatial reuse field.

Transmitting STA.
In at least one computer-readable recording medium comprising an instruction based on being executed by at least one processor,

Receiving a trigger frame through a preset frequency band from a transmitting STA (station); and

Comprising the step of transmitting a TB PPDU (Trigger Based Physical Protocol Data Unit) to the transmitting STA,

The trigger frame includes first to fourth spatial reuse (Spatial Reuse) fields,

The TB PPDU includes fifth and sixth spatial reuse fields,

When the preset frequency band is a 40 MHz band,

The first and third spatial reuse fields include spatial reuse values of a first 20 MHz subchannel having a low frequency in the 40 MHz band,

The second and fourth spatial reuse fields include spatial reuse values of a second 20 MHz subchannel having a high frequency in the 40 MHz band,

The fifth spatial reuse field is constructed by duplicating the first spatial reuse field, and

The sixth spatial reuse field is configured by duplicating the second spatial reuse field.

recording medium.
A device in a wireless LAN system, comprising:

Memory; and

a processor operatively coupled with the memory, the processor comprising:

receiving a trigger frame through a preset frequency band from a transmitting STA (station); and

Transmitting a TB PPDU (Trigger Based Physical Protocol Data Unit) to the transmitting STA,

The trigger frame includes first to fourth spatial reuse (Spatial Reuse) fields,

The TB PPDU includes fifth and sixth spatial reuse fields,

When the preset frequency band is a 40 MHz band,

The first and third spatial reuse fields include spatial reuse values of a first 20 MHz subchannel having a low frequency in the 40 MHz band,

The second and fourth spatial reuse fields include spatial reuse values of a second 20 MHz subchannel having a high frequency in the 40 MHz band,

The fifth spatial reuse field is constructed by duplicating the first spatial reuse field, and

The sixth spatial reuse field is configured by duplicating the second spatial reuse field.

Device.