# US 12,120,771 B2 · Method, system and non-transitory computer-readable medium for the unambiguous identification of non-associated Wi-Fi devices > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,120,771 B2 - Document ID: US12120771B2 - Status: Granted - Kind: B2 - Application number: 17/712,684 - Filed: 2022-04-04 - Published: 2022-12-22 - Granted: 2024-10-15 - Earliest claimed: 2021-06-18 - Assignees: Aoife Solutions, S.L. - Applicants: Aoife Solutions, S.L. - Inventors: Jesus Fernandez Manzano; Pablo Aguilera Bonet; Jose Antonio Delgado Alfonso; Jose Ayub Gonzalez Garrido - Web page: https://patentgrep.com/patent/US12120771B2 ## CPC - H04W 8/005: {Discovery of network devices, e.g. terminals} - H04W 48/14: using user query {or user detection} - H04W 8/26: Network addressing or numbering for mobility support - H04W 48/16: Discovering, processing access restriction or access information - 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) ## Abstract A method, system and non-transitory computer-readable medium for the unambiguous identification of non-associated Wi-Fi devices, where upon receiving (102), by an access point (200), a probe request (202) from a Wi-Fi device (201) not associated to the access point (200), sending (104) a probe response (204) addressed to the non-associated Wi-Fi device (201), wherein the probe response (204) comprises a Hotspot 2.0 Indication element (206) including a ANQP Domain ID field (207) with a determined value; receiving (106), by the access point (200), an action frame (208) sent by the non-associated Wi-Fi device (201) in response to the Hotspot 2.0 Indication element (206) of the probe response (204); obtaining a static MAC address (209) of the non-associated Wi-Fi device (201) from the source address of the received action frame (208); and identifying (110) the non-associated Wi-Fi device (201) based on the obtained static MAC address (209). ## Claims ### Claim 1 A method for the unambiguous identification of non-associated Wi-Fi devices, the method comprising: upon receiving, by an access point, a probe request from a Wi-Fi device not associated to the access point, sending a probe response addressed to the non-associated Wi-Fi device, wherein the probe response comprises a Hotspot 2.0 Indication element including a ANQP Domain ID field with a determined value; receiving, by the access point, an action frame sent by the non-associated Wi-Fi device in response to the Hotspot 2.0 Indication element of the probe response; obtaining a static MAC address of the non-associated Wi-Fi device from the source address of the received action frame; and identifying the non-associated Wi-Fi device based on the obtained static MAC address, wherein the combined value of the ANQP Domain ID field and the SSID field of the probe response is modified each time the probe response is sent again to the same non-associated Wi-Fi device. ### Claim 2 (depends on 1) The method of claim 1, further comprising periodically modifying, by the access point, the value of the ANQP Domain ID field to be used in the probe response. ### Claim 3 (depends on 2) The method of claim 2, further comprising modifying the SSID field to be used in the probe response when a determined number of values have been used for the ANQP Domain ID field. ### Claim 4 (depends on 3) The method of claim 3, wherein the value of the SSID field of the probe response is randomized. ### Claim 5 A system for the unambiguous identification of non-associated Wi-Fi devices, the system comprising at least one access point, wherein each access point comprises: a Wi-Fi interface; a processing unit configured to: upon receiving a probe request from a Wi-Fi device not associated to the access point, send a probe response addressed to the non-associated Wi-Fi device, wherein the probe response comprises a Hotspot 2.0 Indication element including a ANQP (Access Network Query Protocol) Domain ID field with a determined value; receive an action frame sent by the non-associated Wi-Fi device in response to the Hotspot 2.0 Indication element of the probe response; obtain a static MAC address of the non-associated Wi-Fi device from the source address of the received action frame; and identify the non-associated Wi-Fi device based on the obtained static MAC address, wherein the processing unit of each access point is configured to modify the combined value of the ANQP Domain ID field and the SSID field of the probe response each time the probe response is sent again to the same non-associated Wi-Fi device. ### Claim 6 (depends on 5) The system of claim 5, wherein the processing unit of each access point is configured to periodically modify the value of the ANQP Domain ID field to be used in the probe response. ### Claim 7 (depends on 6) The system of claim 6, wherein the processing unit of each access point is configured to modify the SSID field to be used in the probe response when a determined number of values have been used for the ANQP Domain ID field. ### Claim 8 (depends on 5) The system of claim 5, wherein the processing unit of each access point is configured to randomize the value of the SSID field of the probe response. ### Claim 9 (depends on 1) A non-transitory computer-readable medium for the unambiguous identification of non-associated Wi-Fi devices, comprising executable programming instructions stored thereon that, when executed by a processor, cause the processor to carry out the steps of the method of claim 1. ### Claim 10 A method for the unambiguous identification of non-associated Wi-Fi devices, the method comprising: upon receiving, by an access point, a probe request from a Wi-Fi device not associated to the access point, sending a probe response addressed to the non-associated Wi-Fi device, wherein the probe response comprises a Hotspot 2.0 Indication element including a ANQP Domain ID field with a determined value; receiving, by the access point, an action frame sent by the non-associated Wi-Fi device in response to the Hotspot 2.0 Indication element of the probe response; obtaining a static MAC address of the non-associated Wi-Fi device from the source address of the received action frame; and identifying the non-associated Wi-Fi device based on the obtained static MAC address, periodically modifying, by the access point, the value of the ANQP Domain ID field to be used in the probe response, and further comprising modifying the SSID field to be used in the probe response when a determined number of values have been used for the ANQP Domain ID field. ### Claim 11 A system for the unambiguous identification of non-associated Wi-Fi devices, the system comprising at least one access point, wherein each access point comprises: a Wi-Fi interface; a processing unit configured to: upon receiving a probe request from a Wi-Fi device not associated to the access point, send a probe response addressed to the non-associated Wi-Fi device, wherein the probe response comprises a Hotspot 2.0 Indication element including a ANQP (Access Network Query Protocol) Domain ID field with a determined value; receive an action frame sent by the non-associated Wi-Fi device in response to the Hotspot 2.0 Indication element of the probe response; obtain a static MAC address of the non-associated Wi-Fi device from the source address of the received action frame; and identify the non-associated Wi-Fi device based on the obtained static MAC address, wherein the processing unit of each access point is configured to periodically modify the value of the ANQP Domain ID field to be used in the probe response, and wherein the processing unit of each access point is configured to modify the SSID field to be used in the probe response when a determined number of values have been used for the ANQP Domain ID field.