# US 2026/0075673 A1 · Mac address handling for roaming in wireless lan system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2026/0075673 A1 - Document ID: US20260075673A1 - Status: Published application - Kind: A1 - Application number: 19/392,784 - Filed: 2025-11-18 - Published: 2026-03-12 - Earliest claimed: 2023-09-26 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Yelin YOON; Jinsoo CHOI; Insun JANG; Sunhee BAEK; Geonhwan KIM; Dongju CHA - Web page: https://patentgrep.com/patent/US20260075673A1 ## CPC - H04W 36/08: Reselecting an access point - H04W 76/15: Setup of multiple wireless link connections - H04L 9/0822: {using key encryption key} - H04L 61/103: across network layers, e.g. resolution of network layer into physical layer addresses or address resolution protocol [ARP] - H04L 61/50: Address allocation - H04L 2101/622: Layer-2 addresses, e.g. medium access control [MAC] addresses - H04W 36/0005: {Control or signalling for completing the hand-off} - H04W 36/18: for allowing seamless reselection, e.g. soft reselection - H04W 84/12: WLAN [Wireless Local Area Networks] - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract The present disclosure relates to media access control (MAC) address handling for roaming in a wireless LAN system. According to an embodiment of the present disclosure, a method performed by a station (STA) in a wireless LAN system comprises the steps of: performing an association procedure with a first access point (AP); obtaining a media access control (MAC) address for a roaming group including the first AP; transmitting a roaming request frame including the MAC address for the roaming group to the first AP; and performing roaming to a second A P included in the roaming group on the basis of receiving a roaming response frame for the roaming request frame, wherein the MAC address for the roaming group is common to a plurality of APs included in the roaming group. ## Claims ### Claim 1 A method performed by a non-access point (AP) multi-link device (MLD) comprising: receiving, by a non-AP station (STA) affiliated with the non-AP MLD, a group identifier identifying a group of AP MLDs for a seamless basic service set (BSS) transition, wherein the seamless BSS transition is a BSS transition performed between AP MLDs that belong to the group while the non-AP MLD maintains association; transmitting, by the non-AP STA, a request frame for seamless BSS transition, wherein the request frame comprises identification information related to an AP MLD within the group; receiving, by the non-AP STA, a response frame to the request frame; and executing, by the non-AP STA, a seamless BSS transition to the AP MLD based on receiving the response frame. ### Claim 2 (depends on 1) The method of claim 1, wherein the group identifier comprises a media access control (MAC) address for the group. ### Claim 3 (depends on 1) The method of claim 1, wherein the request frame comprises a reconfiguration multi-link (ML) element, and wherein the reconfiguration ML element comprises the identification information related to the AP MLD. ### Claim 4 (depends on 3) The method of claim 3, wherein the identification information related to the AP MLD is included in a common information field of the reconfiguration ML element. ### Claim 5 (depends on 3) The method of claim 3, wherein a presence bitmap subfield of the reconfiguration ML element further comprises a subfield indicating whether the identification information related to the AP MLD is included in the common information field of the reconfiguration ML element. ### Claim 6 (depends on 1) The method of claim 1, wherein the receiving of the group identifier comprises receiving a management frame comprising the group identifier, and wherein the management frame is a beacon frame or a probe response frame. ### Claim 7 (depends on 1) The method of claim 1, further comprising obtaining a security key for the group based on the group identifier, wherein the executing of the seamless BSS transition comprises executing the seamless BSS transition to the AP MLD based on the security key for the group. ### Claim 8 A non-access point (AP) multi-link device (MLD) comprising: a transceiver; a memory; and at least one processor operatively coupled to the transceiver and the memory, wherein the memory stores instructions that, based on being executed by the at least one processor, perform operations comprising: receiving, by a non-AP station (STA) affiliated with the non-AP MLD, a group identifier identifying a group of AP MLDs for a seamless basic service set (BSS) transition, wherein the seamless BSS transition is a BSS transition performed between AP MLDs that belong to the group while the non-AP MLD maintains association; transmitting, by the non-AP STA, a request frame for seamless BSS transition, wherein the request frame comprises identification information related to an AP MLD within the group; receiving, by the non-AP STA, a response frame to the request frame; and executing, by the non-AP STA, a seamless BSS transition to the AP MLD based on receiving the response frame. ### Claim 9 A first access point (AP) multi-link device (MLD) comprising: a transceiver; a memory; and at least one processor operatively coupled to the transceiver and the memory, wherein the memory stores instructions that, based on being executed by the at least one processor, perform operations comprising: transmitting, by an AP affiliated with the AP MLD to a non-AP station (STA) affiliated with a non-AP MLD, a group identifier identifying a group of AP MLDs for a seamless basic service set (BSS) transition, wherein the seamless BSS transition is a BSS transition performed between AP MLDs that belong to the group while the non-AP MLD maintains association; receiving, by the AP from the non-AP STA, a request frame for seamless BSS transition, wherein the request frame comprises identification information related to a second AP MLD within the group; and transmitting, by the AP to the non-AP STA, a response frame to the request frame, wherein a seamless BSS transition to the AP MLD is executed after the response frame is transmitted. ### Claim 10 (depends on 9) The first AP MLD of claim 9, wherein the request frame comprises a reconfiguration multi-link (ML) element, and wherein the reconfiguration ML element comprises the identification information related to the AP MLD. ### Claim 11 (depends on 10) The first AP MLD of claim 10, wherein the identification information related to the AP MLD is included in a common information field of the reconfiguration ML element. ### Claim 12 (depends on 1) The method of claim 1, wherein the identification information related to the AP MLD comprises an identifier or a media access control (MAC) address of the AP MLD. ### Claim 13 (depends on 8) The non-AP MLD of claim 8, wherein the identification information related to the AP MLD comprises an identifier or a media access control (MAC) address of the AP MLD. ### Claim 14 (depends on 9) The first AP MLD of claim 9, wherein the identification information related to the second AP MLD comprises an identifier or a media access control (MAC) address of the second AP MLD.