Abstract: According to various embodiments, a multi-link device including a first STA and a second STA may receive a first PPDU by means of the first STA. The PPDU may include information about traffic buffered in the second STA operating in a second link. In response to the first PPDU, the multi-link device may change the second STA from a doze state to an awake state, and transmit information about the state of the second STA by means of the second STA.

Abstract: In a wireless local area network (LAN) system, an STA of a multi-link device (MLD) may transmit MAC addresses of other STAs included in the same MLD as the STA in a link setup step. The MAC addresses of other STAs may be included multi-link address information. The multi-link address information may be included in a Multi-link Element defined in a conventional Management frame such as a Beacon Frame, a Probe Response Frame, an Association Request Frame, and an Association Response Frame.

Abstract: In a wireless local area network (WLAN) system, a transmitting multi-link device (MLD) may defer the transmission of a PPDU on a first link, even if a back-off counter of a non-primary link reaches zero, as long as a back-off counter of a primary link does not reach zero. When the transmission of the PPDU is deferred, the back-off counter may be kept at zero.

Abstract: A method and a device for transmitting updated information for an ML reconfiguration in a wireless LAN system are proposed. Specifically, a reception MLD performs an ML reconfiguration with a transmission MLD. The reception MLD transmits MLD capability information for the ML reconfiguration to the transmission MLD. The transmission MLD comprises a first transmission STA operating in a first link and a second transmission STA operating in a second link. The reception MLD comprises a first reception STA operating in the first link and a second reception STA operating in the second link. The MLD capability information includes information on a change in the number of links supported by the transmission and reception MLDs at the same time.

Abstract: Proposed are a method and a device for requesting partial information from APs within a transmission MLD in a WLAN system. Particularly, a reception MLD transmits a probe request frame to a transmission MLD via a first link. The reception MLD receives a probe response frame from the transmission MLD via the first link. When the partial information regarding the first link and the partial information regarding the second link are the same, the partial information regarding the second link is requested on the basis of the first request element, and a value of a first full information profile sub-field is set to 0.

Abstract: According to various embodiments, a multi-link device (MLD) operating in a plurality of links including a first link can transmit a request frame to a first AP of an AP MLD through a first STA (station), wherein the request frame includes an information field for requesting every element included in an element set designated for a second link. The MLD can, on the basis of the request frame, receive every element included in the element set designated for the second link.

Abstract: In a wireless local area network system, a multi-link device (MLD) may transmit a multi-link element including a number-of-links field and a link present field indicating whether the number-of-links field exists. The multi-link element further includes a multi-link control field, a common information field, and a link information field. The number-of-links field may be included in the multi-link control field.

Abstract: According to various embodiments, a multi-link device (MLD) operating in a plurality of links can receive a PPDU through a first link from among the plurality of links. The PPU can include a first information field related to a second link that is differentiated from the first link. The first information field related to a second link can include a second information field related to a link identifier of a second link and a third information field related to whether all pieces of element information related to a second link is included in the PPDU.

Abstract: Proposed are a method and an apparatus for changing a primary link belonging to an NSTR link pair through an ML element in a WLAN system Specifically, a receiving MLD receives an ML element from a transmitting MLD via a first link. The receiving MLD decodes the ML element. The first link is a primary link, and a second link is a non-primary link. The first and second links are link pairs operating as NSTRs. The ML element contains a common information field. The common information field includes first and second subfields. The first subfield includes information that the primary link is changed from the first link to the second link. The second subfield includes information on a time when the primary link is changed from the first link to the second link.

Abstract: In a wireless local area network system, a receiving device may receive a Block Acknowledgment Request (BAR) frame including information related to a link for which an ACK is requested, and transmit a Block ACK (BA) frame on the basis of the BAR frame. The receiving device is a Multi-Link Device (MLD), which supports communication over multiple links. Each link of the multiple links can be configured based on 2.4 GHz band, 5 GHz band, and/or 6 GHz band defined in a conventional wireless local area network system.

Abstract: Proposed are a method and apparatus for transmitting an ML element for ML reconfiguration in a wireless LAN system. In particular, a reception MLD generates a first ML element for ML reconfiguration. The reception MLD transmits the first ML element to a transmission MLD through a first link. The first ML element includes a profile sub-element of a second reception STA. The profile sub-element of the second reception STA includes a first STA control field. The first STA control field includes an entire profile sub-field. When a value of the entire profile sub-field is 1, the profile sub-element of the second reception STA includes entire information for the ML reconfiguration. When the value of entire profile sub-field is 0, the profile sub-element of the second reception STA does not include any information for the ML reconfiguration.

Abstract: In a wireless local area network (WLAN) system, a transmitting multi-link device (MLD) may defer the transmission of a PPDU on a first link, even if a back-off counter of a non-primary link reaches zero, as long as a back-off counter of a primary link does not reach zero. When the transmission of the PPDU is deferred, the back-off counter may be kept at zero.

Abstract: A transmitting multi-link device (MLD) in a wireless local area network system enables a first station (STA) to perform a back-off operation again without transmitting PPDU, if a second STA is in the middle of receiving even when a back-off counter (BC) of the first STA becomes 0. The first STA and the second STA are included in the same transmitting MLD. The first STA operates on a first link and the second STA operates on a second link. The first and second links are included in a non-simultaneous transmit and receive (NSTR) link pair.

Abstract: In a Wireless Local Area Network system, an STA may receive a trigger frame from an AP. The trigger frame may include a common information field and user information fields. Each of the user information fields may include a first field related to an association identifier (AID) and a second field including information for the STA related to the AID. The second field may include special information for every STA receiving the trigger frame on the basis that the first field has a specific value. The common information field may include a present field related to whether a user information field in which the first field has the specific value is present among the user information fields.

Abstract: According to various embodiments, a multi-link device (MLD) operating in a plurality of links including a first link can transmit a request frame to a first AP of an AP MILD through a first STA (station), wherein the request frame includes an information field for requesting every element included in an element set designated for a second link. The MILD can, on the basis of the request frame, receive every element included in the element set designated for the second link.

Abstract: The present disclosure relates to a method performed by a non-access point (AP) station (STA) multi-link device (MLD) of a wireless LAN system, the method comprising the steps of: transmitting, through a first link, a negotiation frame including first maximum number of spatial stream (NSS) information to an AP MLD; and receiving a negotiation response frame from the AP MLD through the first link.

Abstract: In a wireless local area network system. a reception multi-link device (MLD) may not transmit a CTS frame, even if the reception multi-link device receives an RTS frame via a second link, in the case that an STA operating via a first link is a TXOP responder.

Abstract: According to various embodiments, a multi-link device (MLD) operating in multiple links including a first link may transmit, through a first station (STA) and to a first AP of an AP multi-link device, a request frame including an information field for requesting at least one element related to a second link. The multi-link device may receive at least one element related to the second link on the basis of the request frame.

Abstract: According to various embodiments, a multi-link device (MLD) operating in a plurality of links can receive a PPDU through a first link from among the plurality of links. The PPU can include a first information field related to a second link that is differentiated from the first link. The first information field related to a second link can include a second information field related to a link identifier of a second link and a third information field related to whether all pieces of element information related to a second link is included in the PPDU.

Abstract: Proposed are a method and a device for requesting the same partial information for all transmission STAs within a transmission MLD and responding thereto in a wireless LAN system. Specifically, a reception MLD transmits an ML probe request frame through a first link from the transmission MLD. The reception MLD receives an ML probe response frame through the first link from the transmission MLD. The ML probe request frame includes a first frame body and a probe request ML element. When the first reception ST A requests the same partial information for all transmission STAs, the first frame body includes a first request element and the probe request ML element does not include a profile sub-element of the second transmission STA.