WO2021167169A1 - Method and device for configuring multiple links in wireless lan system - Google Patents

Abstract

Proposed are a method and a device for configuring multiple links in a wireless LAN system. Specifically, a transmission STA performs a scanning procedure with a reception STA. The transmission STA performs an association procedure with the reception STA in a first band. The transmission STA transmits information on a second band to the reception STA after the association procedure. The transmission STA configures multiple links with the reception STA on the basis of the information on the second band. The multiple links include a first and a second band. The first band is a non-secure band and the second band is a secure band.

Description

Method and apparatus for setting up multiple links in a wireless LAN system

The present specification relates to a technique for establishing multiple links in a wireless LAN system, and more particularly, to a method and apparatus for establishing multiple links for operation of a security band.

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 the Extreme High Throughput (EHT) specification, which 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 WLAN 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 establishing multiple links in a wireless LAN system.

An example of the present specification proposes a method for establishing multiple links.

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.

The next-generation wireless LAN system may support flexible DL/UL (FDU) technology. The FDU technology is a technology in which a terminal having two or more RFs independently transmits and receives data in each RF. Since data transmitted/received through a specific RF does not affect data transmitted/received through another RF, there is an advantage in that a channel can be efficiently used when the FDU technology is applied.

This embodiment proposes a method for configuring multiple links to which the FDU technology is applied, in particular, a method for configuring multiple links for setting a specific band as a security band.

This embodiment is performed in a transmitting STA, and the transmitting STA may correspond to an access point (AP). The receiving STA of this embodiment may correspond to a STA supporting an Extremely High Throughput (EHT) WLAN system.

A transmitting STA (station) performs a scanning procedure with a receiving STA.

The transmitting STA performs an association procedure with the receiving STA in the first band.

The transmitting STA transmits information on the second band to the receiving STA after the association procedure.

The transmitting STA establishes the multi-link with the receiving STA based on the information on the second band.

The multiple links include the first and second bands. That is, the multi-link is a link in which the first and second bands operate independently. In this case, the first band is a non-secure band, and the second band is a secure band.

According to the embodiment proposed in this specification, by setting multiple links operating in the security band, the performance and security of the performance of a specific terminal operating in the security band is improved, and transmission of the beacon frame and the scanning related frame in the security band is reduced. Because it is limited, overhead can be reduced.

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 local area network (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 resource units (RUs) 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 a resource unit (RU) 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 operation according to UL-MU.

11 shows an example of a trigger frame.

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

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

14 illustrates the technical features of the UORA technique.

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

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

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

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

19 is an example of flexible DL/UL operation.

20 is an example of flexible DL/UL operation in which a security band is designated.

21 is an example of a flexible DL/UL operation based on a trigger frame.

22 is a flowchart illustrating a procedure for establishing multiple links in a transmitting STA according to the present embodiment.

23 is a flowchart illustrating a procedure for establishing multiple links in a receiving STA according to the present embodiment.

24 shows a more detailed wireless device implementing an embodiment of the present invention.

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 “A 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 a 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.

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

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 of the present specification may be referred to by various names such as a network, a base station, a Node-B, an access point (AP), a repeater, a router, and a relay. 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 the present 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-drawing (a) of FIG. 1 as follows.

The first STA 110 may include a processor 111 , a memory 112 , and a transceiver 113 . The illustrated processor, memory, and transceiver may each be implemented as separate chips, or at least two or more blocks/functions may be implemented through 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 (ie, a transmission signal) to be transmitted through the transceiver.

For example, an operation of a device denoted 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 . Related 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 . 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 , (transmission/reception) apparatus, network, and the like 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, an operation in which various STAs generate a transmit/receive signal or perform data processing or calculation in advance for the transmit/receive signal 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 / obtaining 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 the ACK signal may include In addition, in the following example, various information used by various STAs for determination/acquisition/configuration/computation/decoding/encoding of transmit/receive signals (for example, information related to fields/subfields/control fields/parameters/power, etc.) 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 shown in (b) of FIG. 1 are the processors 111 and 121 and the memories 112 and 122 shown 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 the sub-drawing (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 the 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 in which 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 shown 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 , 121 or processing chips 114 , 124 shown in FIG. 1 may include 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 an enhanced processor.

In this specification, the uplink may mean a link for communication from the non-AP STA to the AP STA, and an uplink PPDU/packet/signal may be transmitted through the uplink. In addition, in the present 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 local area network (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 also be possible to establish a network and perform communication 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 must 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 around it while moving channels, and waits for a response. A responder transmits a probe response frame in response to the probe request frame to the STA that has transmitted the probe request frame. Here, the responder may be the 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 the scanning receives the beacon frame, it stores information on the BSS included in the beacon frame and records the 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 SS320. 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), interworking service capability, and the like may include information. 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 training signals, 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). 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. 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. In addition, a resource unit may be defined even when a signal is transmitted to one STA. The resource unit may be used for STF, LTF, data field, and the like.

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

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 5 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 multiple 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 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 extended or increased, this embodiment is not limited to the specific size of each RU (ie, the number of corresponding tones).

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

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 can 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 the example of FIG. 4 .

7 is a diagram illustrating an arrangement of a resource unit (RU) used on an 80 MHz band.

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. have. 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.

Meanwhile, the fact that the specific number of RUs can be changed is the same as in the examples of FIGS. 5 and 6 .

The RU arrangement (ie, RU location) shown in FIGS. 5 to 7 may be applied to a new WLAN system (eg, EHT system) as it is. On the other hand, in the 160 MHz band supported by the new WLAN system, the arrangement of RUs for 80 MHz (ie, the example of FIG. 7) is repeated twice or the arrangement of RUs for 40 MHz (ie, the example of FIG. 6) is repeated 4 times can be repeated. In addition, when the EHT PPDU is configured in a 320 MHz band, the arrangement of the RU for 80 MHz (an example of FIG. 7) is repeated 4 times or the arrangement of the RU for 40 MHz (ie, the example of FIG. 6) can be repeated 8 times. have.

One RU in this specification may be allocated for only one STA (eg, non-AP). Alternatively, a plurality of RUs may be allocated for one STA (eg, non-AP).

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 transmitted to a plurality of users.

As shown in FIG. 8 , the common field 920 and the user-individual field 930 may be separately encoded.

The common field 920 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 RU (26-RU/52-RU/106-RU) is 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 8, 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 of 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 left-most side through the MU-MIMO technique, and the 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 .

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

For example, if 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 of the channel. 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. Specifically, examples of the second bits (ie, B11-B14) may be as shown in Tables 3 to 4 below.

As shown in Table 3 and/or Table 4, the second bit (ie, B11-B14) may include information about the number of spatial streams allocated to a plurality of user STAs allocated according to the MU-MIMO technique. have. For example, when three user STAs are allocated to 106-RU based on the MU-MIMO technique as shown in FIG. 9, N_user is set to “3”, and accordingly, as shown in Table 3, N_STS[1], Values of N_STS[2] and N_STS[3] may be determined. For example, when the value of the second bits B11-B14 is “0011”, N_STS[1]=4, N_STS[2]=1, N_STS[3]=1 may be set. That is, in the example of FIG. 9 , four spatial streams may be allocated to user field 1, one spatial stream may be allocated to user field 2, and one spatial stream may be allocated to user field 3 in the example of FIG.

As an example of Table 3 and/or Table 4, information about the number of spatial streams for a user STA (ie, the second bit, B11-B14) may consist of 4 bits. In addition, information on the number of spatial streams (ie, second bits, B11-B14) for a user STA may support up to 8 spatial streams. In addition, information on the number of spatial streams (ie, the second bit, B11-B14) may support up to four spatial streams for one user STA.

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 (a 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).

10 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 1330 . 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 are transmitted in the same time zone, and may be transmitted from a plurality of STAs (eg, user STAs) in which 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. 11 to 13 . 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.

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

Each field shown in FIG. 11 may be partially omitted, and another field may be added. In addition, the length of each field may be changed differently from the illustration.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Hereinafter, a UL OFDMA-based random access (UORA) technique will be described.

14 illustrates the technical features of the UORA technique.

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

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

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

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

The 2.4 GHz band may be referred to as another name such as a first band (band). Also, the 2.4 GHz band may mean a frequency region in which channels having a center frequency adjacent to 2.4 GHz (eg, channels having a center frequency within 2.4 to 2.5 GHz) are used/supported/defined.

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

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

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

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

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

A plurality of channels may be configured within the 5 GHz band, and the bandwidth of each channel may be variously configured such as 20 MHz, 40 MHz, 80 MHz, or 160 MHz. For example, the 5170 MHz to 5330 MHz frequency region/range in UNII-1 and UNII-2 may be divided into eight 20 MHz channels. The 5170 MHz to 5330 MHz frequency domain/range may be divided into 4 channels through the 40 MHz frequency domain. The 5170 MHz to 5330 MHz frequency domain/range may be divided into two channels through the 80 MHz frequency domain. Alternatively, the 5170 MHz to 5330 MHz frequency domain/range may be divided into one channel through the 160 MHz frequency domain.

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

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

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

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

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

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

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

The PPDU of FIG. 18 may be referred to by various names such as an EHT PPDU, a transmission PPDU, a reception PPDU, a first type or an Nth type PPDU. In addition, it can be used in an EHT system and/or a new WLAN system in which the EHT system is improved.

The subfield of FIG. 18 may be changed to various names. For example, the SIG A field may be referred to as an EHT-SIG-A field, the SIG B field may be referred to as EHT-SIG-B, the STF field may be referred to as an EHT-STF field, and the LTF field may be referred to as an EHT-LTF field.

The subcarrier spacing of the L-LTF, L-STF, L-SIG, and RL-SIG fields of FIG. 18 may be set to 312.5 kHz, and the subcarrier spacing of the STF, LTF, and data fields may be set to 78.125 kHz. That is, the subcarrier indices of the L-LTF, L-STF, L-SIG, and RL-SIG fields may be displayed in units of 312.5 kHz, and the subcarrier indices of the STF, LTF, and Data fields may be expressed in units of 78.125 kHz.

The SIG A and/or SIG B fields of FIG. 18 may include additional fields (eg, SIG C or one control symbol, etc.). The subcarrier spacing of all/part of the SIG A and SIG B fields may be set to 312.5 kHz, and the subcarrier spacing of the remaining part may be set to 78.125 kHz.

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

The L-SIG field of FIG. 18 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, a 12-bit Length field may include information about the number of octets of a Physical Service Data Unit (PSDU). 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 3 + 1” or “a multiple of 3 +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 3” +2”.

For example, the transmitting STA may apply BCC encoding based on a code rate of 1/2 to 24-bit information of the L-SIG field. Thereafter, the transmitting STA may obtain a 48-bit BCC 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. have. The transmitting STA may additionally map signals of {-1, -1, -1, 1} to the subcarrier indexes {-28, -27, +27, 28}. The above signal may 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.

After RL-SIG of FIG. 18 , for example, EHT-SIG-A or one control symbol may be inserted. A symbol consecutive to the RL-SIG (ie, EHT-SIG-A or one control symbol) may include information of 26 bits, and may include information for identifying the type of the EHT PPDU. For example, when EHT PPDU is divided into various types (eg, EHT PPDU supporting SU, EHT PPDU supporting MU, EHT PPDU related to Trigger Frame, EHT PPDU related to Extended Range transmission, etc.) , information on the type of the EHT PPDU may be included in a symbol consecutive to the RL-SIG.

A symbol consecutive to the RL-SIG may include, for example, information about the length of the TXOP and information about the BSS color ID. For example, the SIG-A field may be configured consecutively to a symbol (eg, one control symbol) consecutive to the RL-SIG. Alternatively, a symbol following the RL-SIG may be the SIG-A field.

For example, the SIG-A field is 1) a DL/UL indicator, 2) a BSS color field that is an identifier of the BSS, 3) a field including information about the remaining time of the current TXOP section, 4) a bandwidth Bandwidth field including information, 5) Field including information on MCS technique applied to SIG-B, 6) Information related to whether dual subcarrier modulation technique is applied to SIG-B an indication field, 7) a field including information on the number of symbols used for SIG-B, 8) a field including information on whether SIG-B is generated over the entire band, 9) LTF/STF A field including information on the type of , 10) may include information on a field indicating the length of the LTF and the length of the CP.

The SIG-B of FIG. 18 may include the technical features of the HE-SIG-B shown in the examples of FIGS. 8 to 9 as it is.

The STF of FIG. 18 may be used to improve automatic gain control estimation in a multiple input multiple output (MIMO) environment or an OFDMA environment. The LTF of FIG. 18 may be used to estimate a channel in a MIMO environment or an OFDMA environment.

The STF of FIG. 18 may be set to various types. For example, the first type of STF (ie, 1x STF) may be generated based on the first type STF sequence in which non-zero coefficients are disposed at intervals of 16 subcarriers. The STF signal generated based on the first type STF sequence may have a period of 0.8 µs, and the 0.8 µs period signal may be repeated 5 times to become the first type STF having a length of 4 µs. For example, the second type of STF (ie, 2x STF) may be generated based on the second type STF sequence in which non-zero coefficients are disposed at intervals of 8 subcarriers. The STF signal generated based on the second type STF sequence may have a cycle of 1.6 μs, and the cycle signal of 1.6 μs may be repeated 5 times to become a second type EHT-STF having a length of 8 μs. For example, the third type of STF (ie, 4x EHT-STF) may be generated based on a third type STF sequence in which non-zero coefficients are disposed at intervals of 4 subcarriers. The STF signal generated based on the third type STF sequence may have a period of 3.2 µs, and the 3.2 µs period signal may be repeated 5 times to become a third type EHT-STF having a length of 16 µs. Only some of the above-described first to third types of EHT-STF sequences may be used. In addition, the EHT-LTF field may have a first, second, and third type (ie, 1x, 2x, 4x LTF). For example, the first/second/third type LTF field may be generated based on an LTF sequence in which non-zero coefficients are disposed at intervals of 4/2/1 subcarriers. The first/second/third type LTF may have a time length of 3.2/6.4/12.8 μs. In addition, GIs of various lengths (eg, 0.8/1/6/3.2 μs) may be applied to the first/second/third type LTF.

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

The PPDU of FIG. 18 may support various bandwidths. For example, the PPDU of FIG. 18 may have a bandwidth of 20/40/80/160/240/320 MHz. For example, some fields (eg, STF, LTF, data) of FIG. 18 may be configured based on the RUs shown in FIGS. 5 to 7 and the like. For example, when there is one receiving STA of the PPDU of FIG. 18 , all fields of the PPDU of FIG. 18 may occupy the entire bandwidth. For example, when there are a plurality of receiving STAs of the PPDU of FIG. 18 (that is, when an MU PPDU is used), some fields (eg, STF, LTF, data) of FIG. 18 are shown in FIGS. 5 to 7 and the like. It can be configured based on the RU. For example, the STF, LTF, and data fields for the first receiving STA of the PPDU may be transmitted/received through the first RU, and the STF, LTF, and data fields for the second receiving STA of the PPDU are transmitted/received through the second RU can be In this case, the positions of the first/second RUs may be determined based on FIGS. 5 to 7 and the like.

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

The receiving STA may determine the type of the 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, 3) the L-SIG of the received PPDU is Length When the result of applying “modulo 3” to the 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. 18 . ) can be detected. In other words, the receiving STA 1) the first symbol after the L-LTF signal, which 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 receiving 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, and 3) “modulo 3” is applied to the Length value of L-SIG. When the result is detected as “1” or “2”, the received PPDU may be determined as an HE PPDU.

For example, the receiving STA may determine the type of the received PPDU as non-HT, HT, and VHT PPDU based on the following items. For example, if 1) the first symbol after the L-LTF signal is BPSK, and 2) 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 the 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 following example, (transmit/receive/uplink/downlink) signal, (transmit/receive/uplink/downlink) frame, (transmit/receive/uplink/downlink) packet, (transmit/receive/uplink/downlink) data unit, ( A signal indicated by transmission/reception/uplink/downlink) data, etc. may be a signal transmitted/received based on the PPDU of FIG. 18 . The PPDU of FIG. 18 may be used to transmit and receive various types of frames. For example, the PPDU of FIG. 18 may be used for a control frame. 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. 18 may be used for a management frame. An example of the management frame may include a Beacon frame, a (Re-)Association Request frame, a (Re-)Association Response frame, a Probe Request frame, and a Probe Response frame. For example, the PPDU of FIG. 18 may be used for a data frame. For example, the PPDU of FIG. 18 may be used to simultaneously transmit at least two or more of a control frame, a management frame, and a data frame.

1. Multi-band (or Multi-link) aggregation

In the WLAN 802.11 system, to increase the peak throughput, it is considered to use a wider band than the existing 11ax or to transmit the increased stream by using more antennas. In addition, a method of using various bands by aggregation is also being considered.

Hereinafter, “band” may include, for example, 2.4 GHz, 5 GHz, and 6 GHz bands. For example, the 11n standard supported the 2.4 GHz band and the 5 GHz band, and the 11ax standard supported even the 6 GHz band. For example, a plurality of channels may be defined in the 5 GHz band.

A wireless LAN system to which the technical features of the present specification are applied may support multi-band. That is, the transmitting STA, for example, transmits the PPDU through any channel (eg, 20/40/80/80+80/160 MHz, etc.) on the first band (eg, 5 GHz), It is possible to transmit the PPDU through any channel (eg, 20/40/80/80+80/160/240/320 MHz, etc.) on the second band (eg, 6 GHz). (In the present specification, a 240 MHz channel may be a continuous 240 MHz channel or a combination of 80/160 MHz channels that are discontinuous from each other. In addition, a 320 MHz channel may be a continuous 320 MHz channel or a discontinuous 80/160 MHz channel. For example, in this document, a 240 MHz channel may mean a continuous 240 MHz channel, an 80+80+80 MHz channel, or an 80+160 MHz channel)

In addition, multi-band described in this specification can be interpreted in various meanings. For example, the transmitting STA sets any one of 20/40/80/80+80/160/240/320 MHz channels on the 6 GHz band as the first band, and another 20/40/80 on the 6 GHz band Any one of the /80+80/160/240/320 MHz channels may be set as the second band, and multi-band transmission (ie, transmission supporting the first band and the second band simultaneously) may be performed. For example, the transmitting STA may simultaneously transmit the PPDU through the first band and the second band, or may transmit only through one band at a specific time.

At least one of the primary 20 MHz and secondary 20/40/80/160 MHz channels described below may be transmitted in the first band, and the remaining channels may be transmitted in the second band. Alternatively, all channels may be transmitted in the same one band.

In this specification, the term “band” may be replaced with “link”.

2. Examples applicable to the present specification

This specification relates to a multi-link technology in a next-generation WiFi system.

Since the existing Wi-Fi operates only in one band, in order for the terminal that has measured information on the current channel condition to transmit it to the transmitting terminal, the corresponding terminal transmits the channel condition information to the transmitting terminal on the corresponding channel through channel contention. there was only When the channel measurement terminal transmits through channel contention, there is inevitably a difference between the measured time and the time at which the actual value is transmitted. have.

However, since terminals to which multi-band and flexible DL/UL technology are applied can transmit/receive in two or more bands, respectively, when transmitting on a specific channel, additionally providing information on the channel conditions of other bands enables faster channel-specific values than before. It can be forwarded, and there is little overhead because there is no need to transmit a separate packet for this.

Flexible DL/UL technology is a technology in which terminals having two or more RFs independently transmit/receive in each RF. Each RF can transmit by contention or allocation by trigger frame in each designated channel. And the data transmitted by each RF does not affect other RFs.

If flexible DL/UL technology is not applied to a terminal having two or more RFs, the terminal can only transmit or receive at a specific instant, and all RF of the terminal can be used at this time. That is, using two or more RFs, only transmission or reception is possible at a time.

Advantages of flexible DL/UL technology are as follows.

- Channels can be used efficiently. In the flexible DL/UL technology, since RF competes for channels in each channel, it can only determine whether the current channel is Busy/Idle and transmit if it is idle. On the other hand, if the flexible DL/UL technology is not applied, the UE determines the channels of both bands for transmission, and transmission is possible only after a specific condition is satisfied.

- Transmission/reception is possible at the same time. In case of multimedia traffic, response speed is often important, and in this case, transmission/reception occurs alternately, so Flexible DL/UL can better support it. In addition, if flexible DL/UL is not applied, it is impossible to receive in another band while transmitting in a specific band.

And the downsides are:

- Implementation complexity may increase. Since RF can transmit/receive data respectively, a function to manage it on the MAC layer must be additionally implemented.

19 is an example of flexible DL/UL operation.

Referring to FIG. 19 , the terminal has two RFs and operates in Bands 1 and 2, respectively. While DL data was received in Band 1 and ACK was transmitted, UL data was also transmitted in Band 2 and then ACK was received. DL/UL is performed in Bands 1 and 2, respectively.

In this specification, flexible DL/UL is a multi-link technology under discussion in IEEE 802.11be.

In the present specification, it is proposed to designate a specific band as a secure band and to operate to ensure security and performance.

20 is an example of flexible DL/UL operation in which a security band is designated.

Referring to FIG. 20 , a transmitting STA transmits data and a block ack (BA) through a first band (Band 1) based on a first RF, and through a second band (Band 2) based on a second RF Send data and BA. The transmitting STA may independently perform channel contention for each of the first and second bands to transmit data. In addition, in the first band, the transmitting STA may transmit a beacon frame in a non-secure band, but in the second band, the transmitting STA does not transmit a beacon frame in a secure band. Data transmitted in the second band includes an encrypted header, and 3rd party terminals cannot track data transmitted in the second band because of the encrypted header.

21 is an example of a flexible DL/UL operation based on a trigger frame.

Referring to FIG. 21 , a transmitting STA transmits data and a block ack (BA) through a first band (Band 1) based on a first RF, and through a second band (Band 2) based on a second RF Send data and BA. The transmitting STA may transmit data independently for each of the first and second bands based on a trigger frame. In addition, in the first band, the transmitting STA may transmit a beacon frame in a non-secure band, but in the second band, the transmitting STA does not transmit a beacon frame in a secure band. Data transmitted in the second band includes an encrypted header, and 3rd party terminals cannot track data transmitted in the second band because of the encrypted header. In addition, the RU allocation included in the trigger frame is also encrypted so that 3rd party terminals cannot track it.

The features of Secure band are as follows.

1) Encrypted header: Encrypts a part of the header that 3rd party terminals can read so that the information of the sender/receiver and BSS cannot be known.

- The fields below must be encrypted and protected to protect the transmitting and receiving terminals.

i) Address: Since the sender/receiver can be known through the MAC address, a separate encrypted address is used.

ii) BSS Color: As with Address, a separate encrypted BSS Color is used so that the information of BSS cannot be known.

iii) RU allocation: When OFDMA is used, the RU allocation information must be encrypted because it is known to which terminal a specific RU is allocated.

- The fields below are not encrypted as before, and certain information can be provided to a 3rd party. This is because the information is needed for protecting the currently transmitted TXOP.

i) Bandwidth: If the entire bandwidth information of the current TXOP is provided to a 3rd party terminal, those terminals can protect the corresponding band during the corresponding TXOP.

ii) TXOP: When the length information of the current TXOP is provided to a 3rd party terminal, the terminals can protect the TXOP during the corresponding TXOP length.

iii) Length: Length information is required to protect Medium, so encryption is not performed.

2) No beacon: The Beacon frame is not transmitted so that 3rd party terminals cannot know the operation of the current band.

- Therefore, a separate low-power operation should be used instead of the existing low-power operation.

3) No scanning: In the secure band, the scanning process of the terminal is not supported so that an unspecified terminal does not establish association or the operation and existence of the secure band cannot be known.

- Since the Beacon frame is not transmitted, passive scanning of the UE is impossible.

- The AP does not support active scanning because it does not transmit a probe response frame for the probe request frame transmitted by the terminal in the secure band.

When operating the secure band in BSS, there are the following advantages.

- Performance Guarantee: By operating a specific device in the secure band, the performance of a specific device can be guaranteed to a certain level. This is because the operation of terminals other than the designated terminals is restricted in the secure band. Also, in the secure band, since transmission of a management frame related to a beacon frame or scanning is limited, overhead is also small.

- Security improvement: Secure band improves the security of terminals operating in the secure band because 3rd party terminals or other terminals in the BSS cannot know the operation or existence of the secure band.

However, there are also disadvantages due to the secure band as follows.

- Overhead by Encryption: As described above, additional overhead occurs because a part of the header needs to be encrypted.

- Limited network management: Since the Beacon frame is not transmitted, features such as power save can be supported only limitedly.

Terminals and APs supporting secure band operate in the following order.

1) Scanning

- The terminal cannot obtain information about the secure band until it establishes an association.

- The AP does not support scanning through the Beacon frame or the Probe response frame in the secure band.

2) Association

- The terminal performs the association process in the terminal, not in the secure band.

3) Link setup

- After the association process, the AP transmits secure band information to specific terminals.

- Among the terminals receiving the information of the secure band, the terminal receiving the instruction from the AP establishes a link in the secure band.

- In the secure band, the terminal that has completed the link setup transmits a confirmation signal to the AP.

4) Transmission/reception

- After secure link setup is completed, the terminal starts sending/receiving data with the AP.

5) Power save

- In the secure band, since the Beacon frame is not transmitted for security, most of the existing power saves are not supported and a separate power save feature must be used.

This specification proposes a link set up process for secure band operation. The detailed link set up process is as follows.

1) Scanning

- The terminal cannot obtain information about the secure band until it establishes an association.

- AP limitedly supports scanning through a Beacon frame or a Probe response frame in the secure band.

- The following frames can be used for the scanning process.

a) Probe request frame

-> The terminal may transmit a probe request in Broadcast/Unicast to obtain BSS information.

b) Probe response frame

-> AP behaves differently depending on the next situation.

b)-1 When Probe Request frame is transmitted in secure band

b)-1-i) If the Probe Request frame is transmitted to the Broadcast address, the Probe Response frame is not transmitted.

b)-1-ii) If the Probe Request frame is transmitted to the Unicast address, the information on whether the Secure band is supported/operated is included in the Capability and Operation information included in the Probe response frame.

b)-1-iii) Or, if the address of the corresponding terminal is already authenticated, the Probe response frame includes information on whether to support/operate the Secure band in the Capability and Operation information.

b)-2 When Probe Request frame is transmitted in non-secure band

b)-2-i) If the corresponding Probe Request frame is transmitted to the Broadcast address, it is transmitted without including the Secure band support/operation information in the Capability and Operation information included in the Probe response frame.

b)-2-ii) If the corresponding Probe Request frame is transmitted to the unicast address, the information on whether the secure band is supported/operated is included in the Capability and Operation information included in the Probe response frame.

b)-2-iii) Or, if the address of the corresponding terminal is already authenticated, the Probe response frame includes information on whether to support/operate secure band in Capability and Operation information and transmit it.

c) Beacon frame

-> Beacon frame is not transmitted in Secure band.

2) Association

- The terminal performs the association process in the terminal, not in the secure band.

- For the association process, the following frames can be used and the following information can be included.

a) Association request frame

-> Secure band support

-> Secure band operation request

-> Supported Encryption Methods

b) Association response frame

-> Secure band information

3) Link setup

- During or after the association process, the AP transmits secure band information to specific terminals.

- Among the terminals receiving the information of the secure band, the terminal receiving the instruction from the AP establishes a link in the secure band.

- In the secure band, the terminal that has completed the link setup transmits a confirmation signal to the AP.

- The following frames can be used for the link setup process.

a) Band allocation notification frame

-> This is a frame used when the AP allocates a specific band to the UE. When the AP transmits to the terminal, the following information is included. According to the present invention, the frame is used when allocating a specific terminal to the secure band.

a)-1 Channel information of secure band: indicates the band in which the secure band operates, the channel location, bandwidth information, and the like. It also includes information about the time when the terminal switches to the secure band.

a)-2 Secure band operation: Defines the operations of the terminal in the secure band. For example, it informs the low-power operation method in the secure band or the transmittable frame.

a)-3 Encryption information: Includes information for Header Encryption suggested above. It indicates the part of the header to be encrypted or the encryption method.

b) Band allocation confirmation frame

-> When the terminal operates in the non-secure band and receives an instruction to operate the secure band through the band allocation notification frame from the AP, the following operations are performed.

b)-1 The link is switched to the designated channel according to the channel information for secure band indicated in the band allocation notification frame within the designated time.

b)-2 After switching to the secure band, the UE notifies the AP that it has successfully switched to the secure band by sending a band allocation confirmation frame to the AP. In this case, the AP may transmit a Trigger frame at an appropriate time, and the UE may transmit it through a TB (Trigger-based) PPDU.

b)-3 Alternatively, the AP may first transmit a band allocation confirmation frame to the terminal moving to the secure band.

-> The Band allocation confirmation frame may be replaced with a PS-Poll, Null Data Packet (NDP), or uplink (UL) data frame instead of a separate frame.

Hereinafter, the above-described embodiment will be described with reference to FIGS. 1 to 21 .

22 is a flowchart illustrating a procedure for establishing multiple links in a transmitting STA according to the present embodiment.

The example of FIG. 22 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 next-generation wireless LAN system may support flexible DL/UL (FDU) technology. The FDU technology is a technology in which a terminal having two or more RFs independently transmits and receives data in each RF. Since data transmitted/received through a specific RF does not affect data transmitted/received through another RF, there is an advantage in that a channel can be efficiently used when the FDU technology is applied.

This embodiment proposes a method for configuring multiple links to which the FDU technology is applied, in particular, a method for configuring multiple links for setting a specific band as a security band.

The example of FIG. 22 is performed by a transmitting STA, and the transmitting STA may correspond to an access point (AP). The receiving STA of FIG. 22 may correspond to an STA supporting an Extremely High Throughput (EHT) WLAN system.

In step S2210, the transmitting STA (station) performs a scanning procedure with the receiving STA.

In step S2220, the transmitting STA performs an association procedure with the receiving STA in the first band.

In step S2230, the transmitting STA transmits information on the second band to the receiving STA after the association procedure.

In step S2240, the transmitting STA establishes the multi-link with the receiving STA based on the information on the second band.

The multiple links include the first and second bands. That is, the multi-link is a link in which the first and second bands operate independently. In this case, the first band is a non-secure band, and the second band is a secure band.

The information on the second band may not be transmitted to the receiving STA before the association procedure. That is, the receiving STA cannot know that the second band exists until it is associated with the transmitting STA.

The scanning procedure may be performed based on a probe request frame or a probe response frame. In particular, the operation of the transmitting STA may vary depending on whether the probe request frame is transmitted in the first band or the second band.

For example, the transmitting STA may receive the probe request frame from the receiving STA through the first band. The transmitting STA may transmit the probe response frame to the receiving STA through the first band.

When the probe request frame is transmitted in a broadcast manner, the probe response frame may not include information on support and operation of the second band.

When the probe request frame is transmitted in a unicast manner, the probe response frame may include information on support and operation of the second band.

As another example, the transmitting STA may receive the probe request frame from the receiving STA through the second band.

When the probe request frame is transmitted in a broadcast manner, the transmitting STA may not transmit the probe response frame.

When the probe request frame is transmitted in a unicast manner, the probe response frame may include information on support and operation of the second band.

The association procedure may be performed based on an association request frame or an association response frame.

The transmitting STA may receive the association request frame from the receiving STA through the first band. The transmitting STA may transmit the association response frame to the receiving STA through the first band. That is, the receiving STA may be able to associate with the transmitting STA only in a non-security band.

The association request frame may include information on whether the second band is supported, information on an operation request of the second band, and information on an encryption method supportable in the second band.

The association response frame may include information on the second band.

The multi-link may be configured based on a band allocation notification frame or a band allocation confirmation frame.

The transmitting STA may transmit the band allocation announcement frame to the receiving STA. The transmitting STA may receive the band allocation confirmation frame from the receiving STA.

The band allocation announcement frame may include channel information of the second band, operation information of the second band, and encryption information of the second band.

The channel information of the second band includes information on the channel position of the second band, information on the bandwidth of the second band, and at a time when the receiving STA switches from the first band to the second band. may include information about

The operation information of the second band may include information on the operation of the receiving STA in the second band.

The encryption information of the second band may include information on an encryption method of a header of data transmitted/received in the second band.

The band allocation confirmation frame may include switch information of the receiving STA.

The receiving STA may switch from the first band to the second band based on the channel information of the second band. However, the receiving STA may use the first band as a non-security band and use the second band as a security band at the same time.

A header of data transmitted and received in the second band may include first information and second information.

The first information may be encrypted based on encryption information of the second band, and the second information may not be encrypted.

The first information may include addresses of the transmitting STA and the receiving STA, a basic service set (BSS) color, and resource unit (RU) allocation information. The second information may include bandwidth, TXOP (Transmission Opportunity), and length information of the data.

After the multi-link configuration is completed, the transmitting STA may start transmitting/receiving data with the receiving STA through the multi-link.

For example, the transmitting STA may simultaneously transmit first data to the receiving STA or receive second data from the receiving STA through the multiple links.

The first data may be transmitted through the first band, and the second data may be received through the second band.

Since a beacon frame is not transmitted in the second band for security, a separate power save method may be used in the second band.

23 is a flowchart illustrating a procedure for establishing multiple links in a receiving STA according to the present embodiment.

The example of FIG. 23 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 next-generation wireless LAN system may support flexible DL/UL (FDU) technology. The FDU technology is a technology in which a terminal having two or more RFs independently transmits and receives data in each RF. Since data transmitted/received through a specific RF does not affect data transmitted/received through another RF, there is an advantage in that a channel can be efficiently used when the FDU technology is applied.

This embodiment proposes a method for configuring multiple links to which the FDU technology is applied, in particular, a method for configuring multiple links for setting a specific band as a security band.

The example of FIG. 23 is performed by the receiving STA and may correspond to a STA supporting an Extremely High Throughput (EHT) WLAN system. The transmitting STA of FIG. 23 may correspond to an AP.

In step S2310, the receiving STA (station) performs a scanning procedure with the transmitting STA.

In step S2320, the receiving STA performs an association procedure with the transmitting STA in the first band.

In step S2330, the receiving STA receives information on the second band from the transmitting STA after the association procedure.

In step S2340, the receiving STA establishes the multi-link with the transmitting STA based on the information on the second band.

The multiple links include the first and second bands. That is, the multi-link is a link in which the first and second bands operate independently. In this case, the first band is a non-secure band, and the second band is a secure band.

The information on the second band may not be transmitted to the receiving STA before the association procedure. That is, the receiving STA cannot know that the second band exists until it is associated with the transmitting STA.

The scanning procedure may be performed based on a probe request frame or a probe response frame. In particular, the operation of the transmitting STA may vary depending on whether the probe request frame is transmitted in the first band or the second band.

For example, the transmitting STA may receive the probe request frame from the receiving STA through the first band. The transmitting STA may transmit the probe response frame to the receiving STA through the first band.

When the probe request frame is transmitted in a broadcast manner, the probe response frame may not include information on support and operation of the second band.

When the probe request frame is transmitted in a unicast manner, the probe response frame may include information on support and operation of the second band.

As another example, the transmitting STA may receive the probe request frame from the receiving STA through the second band.

When the probe request frame is transmitted in a broadcast manner, the transmitting STA may not transmit the probe response frame.

When the probe request frame is transmitted in a unicast manner, the probe response frame may include information on support and operation of the second band.

The association procedure may be performed based on an association request frame or an association response frame.

The transmitting STA may receive the association request frame from the receiving STA through the first band. The transmitting STA may transmit the association response frame to the receiving STA through the first band. That is, the receiving STA may be able to associate with the transmitting STA only in a non-security band.

The association request frame may include information on whether the second band is supported, information on an operation request of the second band, and information on an encryption method supportable in the second band.

The association response frame may include information on the second band.

The multi-link may be configured based on a band allocation notification frame or a band allocation confirmation frame.

The transmitting STA may transmit the band allocation announcement frame to the receiving STA. The transmitting STA may receive the band allocation confirmation frame from the receiving STA.

The band allocation announcement frame may include channel information of the second band, operation information of the second band, and encryption information of the second band.

The channel information of the second band includes information on the channel position of the second band, information on the bandwidth of the second band, and at a time when the receiving STA switches from the first band to the second band. may include information about

The operation information of the second band may include information on the operation of the receiving STA in the second band.

The encryption information of the second band may include information on an encryption method of a header of data transmitted/received in the second band.

The band allocation confirmation frame may include switch information of the receiving STA.

The receiving STA may switch from the first band to the second band based on the channel information of the second band. However, the receiving STA may use the first band as a non-security band and use the second band as a security band at the same time.

A header of data transmitted and received in the second band may include first information and second information.

The first information may be encrypted based on encryption information of the second band, and the second information may not be encrypted.

The first information may include addresses of the transmitting STA and the receiving STA, a basic service set (BSS) color, and resource unit (RU) allocation information. The second information may include bandwidth, TXOP (Transmission Opportunity), and length information of the data.

After the multi-link configuration is completed, the transmitting STA may start transmitting/receiving data with the receiving STA through the multi-link.

For example, the transmitting STA may simultaneously transmit first data to the receiving STA or receive second data from the receiving STA through the multiple links.

The first data may be transmitted through the first band, and the second data may be received through the second band.

Since a beacon frame is not transmitted in the second band for security, a separate power save method may be used in the second band.

3. Device configuration

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

Each device/STA of the sub-drawings (a)/(b) of FIG. 1 may be modified as shown in FIG. 24 . The transceiver 630 of FIG. 24 may be the same as the transceivers 113 and 123 of FIG. 1 . The transceiver 630 of FIG. 24 may include a receiver and a transmitter.

The processor 610 of FIG. 24 may be the same as the processors 111 and 121 of FIG. 1 . Alternatively, the processor 610 of FIG. 24 may be the same as the processing chips 114 and 124 of FIG. 1 .

The memory 150 of FIG. 24 may be the same as the memories 112 and 122 of FIG. 1 . Alternatively, the memory 150 of FIG. 24 may be a separate external memory different from the memories 112 and 122 of FIG. 1 .

Referring to FIG. 24 , 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. 24 , the speaker 640 may output a sound related result processed by the processor 610 . Microphone 641 may receive sound related input to be used by processor 610 .

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 24 . For example, the technical features of the present specification described above may be applied only to a part of FIGS. 1 and/or 24 . 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. 24 . For example, an apparatus herein is an apparatus for establishing a multi-link, the apparatus including a memory and a processor operatively coupled to the memory, wherein the processor is configured to perform scanning with a transmitting STA. ) procedure, performing an association procedure with the transmitting STA in a first band, receiving information on a second band from the transmitting STA after the association procedure, and receiving information on the second band based on the transmitting STA and the multi-link is established.

The multiple links include the first and second bands. That is, the multi-link is a link in which the first and second bands operate independently. In this case, the first band is a non-secure band, and the second band is a secure band.

The information on the second band may not be transmitted to the receiving STA before the association procedure. That is, the receiving STA cannot know that the second band exists until it is associated with the transmitting STA.

The scanning procedure may be performed based on a probe request frame or a probe response frame. In particular, the operation of the transmitting STA may vary depending on whether the probe request frame is transmitted in the first band or the second band.

For example, the transmitting STA may receive the probe request frame from the receiving STA through the first band. The transmitting STA may transmit the probe response frame to the receiving STA through the first band.

When the probe request frame is transmitted in a broadcast manner, the probe response frame may not include information on support and operation of the second band.

When the probe request frame is transmitted in a unicast manner, the probe response frame may include information on support and operation of the second band.

As another example, the transmitting STA may receive the probe request frame from the receiving STA through the second band.

When the probe request frame is transmitted in a broadcast manner, the transmitting STA may not transmit the probe response frame.

When the probe request frame is transmitted in a unicast manner, the probe response frame may include information on support and operation of the second band.

The association procedure may be performed based on an association request frame or an association response frame.

The transmitting STA may receive the association request frame from the receiving STA through the first band. The transmitting STA may transmit the association response frame to the receiving STA through the first band. That is, the receiving STA may be able to associate with the transmitting STA only in a non-security band.

The association request frame may include information on whether the second band is supported, information on an operation request of the second band, and information on an encryption method supportable in the second band.

The association response frame may include information on the second band.

The multi-link may be configured based on a band allocation notification frame or a band allocation confirmation frame.

The transmitting STA may transmit the band allocation announcement frame to the receiving STA. The transmitting STA may receive the band allocation confirmation frame from the receiving STA.

The band allocation announcement frame may include channel information of the second band, operation information of the second band, and encryption information of the second band.

The channel information of the second band includes information on the channel position of the second band, information on the bandwidth of the second band, and at a time when the receiving STA switches from the first band to the second band. may include information about

The operation information of the second band may include information on the operation of the receiving STA in the second band.

The encryption information of the second band may include information on an encryption method of a header of data transmitted/received in the second band.

The band allocation confirmation frame may include switch information of the receiving STA.

The receiving STA may switch from the first band to the second band based on the channel information of the second band. However, the receiving STA may use the first band as a non-security band and use the second band as a security band at the same time.

A header of data transmitted and received in the second band may include first information and second information.

The first information may be encrypted based on encryption information of the second band, and the second information may not be encrypted.

The first information may include addresses of the transmitting STA and the receiving STA, a basic service set (BSS) color, and resource unit (RU) allocation information. The second information may include bandwidth, TXOP (Transmission Opportunity), and length information of the data.

After the multi-link configuration is completed, the transmitting STA may start transmitting/receiving data with the receiving STA through the multi-link.

For example, the transmitting STA may simultaneously transmit first data to the receiving STA or receive second data from the receiving STA through the multiple links.

The first data may be transmitted through the first band, and the second data may be received through the second band.

Since a beacon frame is not transmitted in the second band for security, a separate power save method may be used in the second band.

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 instructions based on being executed by at least one processor.

The CRM, performing a scanning (scanning) procedure with the transmitting STA; performing an association procedure with the transmitting STA in a first band; receiving information on a second band from the transmitting STA after the association procedure; and establishing the multi-link with the transmitting STA based on the information on the second band. 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. 24 . Meanwhile, the CRM of the present specification may be the memories 112 and 122 of FIG. 1 , the memory 620 of FIG. 24 , or a separate external memory/storage medium/disk.

The multiple links include the first and second bands. That is, the multi-link is a link in which the first and second bands operate independently. In this case, the first band is a non-secure band, and the second band is a secure band.

The information on the second band may not be transmitted to the receiving STA before the association procedure. That is, the receiving STA cannot know that the second band exists until it is associated with the transmitting STA.

The scanning procedure may be performed based on a probe request frame or a probe response frame. In particular, the operation of the transmitting STA may vary depending on whether the probe request frame is transmitted in the first band or the second band.

For example, the transmitting STA may receive the probe request frame from the receiving STA through the first band. The transmitting STA may transmit the probe response frame to the receiving STA through the first band.

When the probe request frame is transmitted in a broadcast manner, the probe response frame may not include information on support and operation of the second band.

When the probe request frame is transmitted in a unicast manner, the probe response frame may include information on support and operation of the second band.

As another example, the transmitting STA may receive the probe request frame from the receiving STA through the second band.

When the probe request frame is transmitted in a broadcast manner, the transmitting STA may not transmit the probe response frame.

When the probe request frame is transmitted in a unicast manner, the probe response frame may include information on support and operation of the second band.

The association procedure may be performed based on an association request frame or an association response frame.

The transmitting STA may receive the association request frame from the receiving STA through the first band. The transmitting STA may transmit the association response frame to the receiving STA through the first band. That is, the receiving STA may be able to associate with the transmitting STA only in a non-security band.

The association request frame may include information on whether the second band is supported, information on an operation request of the second band, and information on an encryption method supportable in the second band.

The association response frame may include information on the second band.

The multi-link may be configured based on a band allocation notification frame or a band allocation confirmation frame.

The transmitting STA may transmit the band allocation announcement frame to the receiving STA. The transmitting STA may receive the band allocation confirmation frame from the receiving STA.

The band allocation announcement frame may include channel information of the second band, operation information of the second band, and encryption information of the second band.

The channel information of the second band includes information on the channel position of the second band, information on the bandwidth of the second band, and at a time when the receiving STA switches from the first band to the second band. may include information about

The operation information of the second band may include information on the operation of the receiving STA in the second band.

The encryption information of the second band may include information on an encryption method of a header of data transmitted/received in the second band.

The band allocation confirmation frame may include switch information of the receiving STA.

The receiving STA may switch from the first band to the second band based on the channel information of the second band. However, the receiving STA may use the first band as a non-security band and use the second band as a security band at the same time.

A header of data transmitted and received in the second band may include first information and second information.

The first information may be encrypted based on encryption information of the second band, and the second information may not be encrypted.

The first information may include addresses of the transmitting STA and the receiving STA, a basic service set (BSS) color, and resource unit (RU) allocation information. The second information may include bandwidth, TXOP (Transmission Opportunity), and length information of the data.

After the multi-link configuration is completed, the transmitting STA may start transmitting/receiving data with the receiving STA through the multi-link.

For example, the transmitting STA may simultaneously transmit first data to the receiving STA or receive second data from the receiving STA through the multiple links.

The first data may be transmitted through the first band, and the second data may be received through the second band.

Since a beacon frame is not transmitted in the second band for security, a separate power save method may be used in the second band.

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 make 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 training data is given. 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 can travel on the ground or fly in the air through the driving unit.

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

The extended reality 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 of the present specification and the technical features of the apparatus claim may be combined and implemented as a method.

Claims (19)

A method for establishing a multi-link in a wireless LAN system, the method comprising: performing, by a transmitting STA (station), a scanning procedure with a receiving STA; performing, by the transmitting STA, an association procedure with the receiving STA in a first band; transmitting, by the transmitting STA, information on a second band to the receiving STA after the association procedure; and Comprising the step of the transmitting STA establishing the multi-link with the receiving STA based on the information on the second band, the multi-link includes the first and second bands; The first band is a non-secure band, and The second band is a secure band. Way. According to claim 1, The information on the second band is not transmitted to the receiving STA before the association procedure. Way. According to claim 1, The scanning procedure is performed based on a probe request frame or a probe response frame. Way. 4. The method of claim 3, receiving, by the transmitting STA, the probe request frame from the receiving STA through the first band; and The method further comprising, by the transmitting STA, transmitting the probe response frame to the receiving STA through the first band, When the probe request frame is transmitted in a broadcast manner, the probe response frame does not include information on support and operation of the second band; When the probe request frame is transmitted in a unicast manner, the probe response frame includes information on support and operation of the second band. Way. 4. The method of claim 3, The method further comprising the step of receiving, by the transmitting STA, the probe request frame from the receiving STA through the second band, When the probe request frame is transmitted in a broadcast manner, the transmitting STA does not transmit the probe response frame, When the probe request frame is transmitted in a unicast manner, the probe response frame includes information on support and operation of the second band. Way. According to claim 1, The association procedure is performed based on an association request frame or an association response frame, receiving, by the transmitting STA, the association request frame from the receiving STA through the first band; and Further comprising the step of transmitting, by the transmitting STA, the association response frame to the receiving STA through the first band, The association request frame includes information on whether or not the second band is supported, information on an operation request of the second band, and information on an encryption method supportable in the second band, The association response frame includes information on the second band Way. According to claim 1, The multi-link is configured based on a band allocation notification frame or a band allocation confirmation frame, transmitting, by the transmitting STA, the band allocation announcement frame to the receiving STA; and Receiving, by the transmitting STA, the band allocation confirmation frame from the receiving STA Way. 8. The method of claim 7, The band allocation announcement frame includes channel information of the second band, operation information of the second band, and encryption information of the second band, The channel information of the second band includes information on the channel position of the second band, information on the bandwidth of the second band, and at a time when the receiving STA switches from the first band to the second band. including information about The operation information of the second band includes information on the operation of the receiving STA in the second band, The encryption information of the second band includes information on an encryption method of a header of data transmitted and received in the second band. Way. 9. The method of claim 8, The band allocation confirmation frame includes switch information of the receiving STA, The receiving STA switches from the first band to the second band based on the channel information of the second band Way. 9. The method of claim 8, The header of data transmitted and received in the second band includes first information and second information, The first information is encrypted based on encryption information of the second band, The second information is not encrypted, The first information includes addresses of the transmitting STA and the receiving STA, a basic service set (BSS) color, and resource unit (RU) allocation information, The second information includes bandwidth, TXOP (Transmission Opportunity), and length information of the data Way. According to claim 1, The method further comprising the step of, by the transmitting STA, simultaneously transmitting first data to the receiving STA or receiving second data from the receiving STA through the multiple links, The first data is transmitted through the first band, The second data is received through the second band, The multi-link is a link in which the first and second bands operate independently. Way. In a transmitting STA (station) that establishes a multi-link in a wireless LAN system, Memory; transceiver; and a processor operatively coupled with the memory and the transceiver, the processor comprising: performing a scanning procedure with the receiving STA; performing an association procedure with the receiving STA in a first band; transmit information on a second band to the receiving STA after the association procedure; and Establishing the multi-link with the receiving STA based on the information on the second band, the multi-link includes the first and second bands; The first band is a non-secure band, and The second band is a secure band. Transmitting STA. 13. The method of claim 12, The information on the second band is not transmitted to the receiving STA before the association procedure. Transmitting STA. A method for establishing a multi-link in a wireless LAN system, the method comprising: performing, by a receiving STA (station), a scanning procedure with a transmitting STA; performing, by the receiving STA, an association procedure with the transmitting STA in a first band; receiving, by the receiving STA, information on a second band from the transmitting STA after the association procedure; and Comprising the step of the receiving STA establishing the multi-link with the transmitting STA based on the information on the second band, the multi-link includes the first and second bands; The first band is a non-secure band, and The second band is a secure band. Way. 15. The method of claim 14, The information on the second band is not transmitted to the receiving STA before the association procedure. Way. In a receiving STA (station) that establishes a multi-link in a wireless LAN system, Memory; transceiver; and a processor operatively coupled with the memory and the transceiver, the processor comprising: performing a scanning procedure with the transmitting STA; performing an association procedure with the transmitting STA in a first band; receiving information on a second band from the transmitting STA after the association procedure; and Establishing the multi-link with the transmitting STA based on the information on the second band, the multi-link includes the first and second bands; The first band is a non-secure band, and The second band is a secure band. Receiving STA. 17. The method of claim 16, The information on the second band is not transmitted to the receiving STA before the association procedure. Receiving STA. In at least one computer-readable recording medium comprising an instruction based on being executed by at least one processor, performing a scanning procedure with the transmitting STA; performing an association procedure with the transmitting STA in a first band; receiving information on a second band from the transmitting STA after the association procedure; and Comprising the step of establishing the multi-link with the transmitting STA based on the information on the second band, the multi-link includes the first and second bands; The first band is a non-secure band, and The second band is a secure band. recording medium. An apparatus for setting up a multi-link in a wireless LAN system, the apparatus comprising: Memory; and a processor operatively coupled with the memory, the processor comprising: performing a scanning procedure with the transmitting STA; performing an association procedure with the transmitting STA in a first band; receiving information on a second band from the transmitting STA after the association procedure; and Establishing the multi-link with the transmitting STA based on the information on the second band, the multi-link includes the first and second bands; The first band is a non-secure band, and The second band is a secure band. Device.

Images