# US 12,217,587 B2 · Wireless terminal detection system, wireless terminal detection device, wireless terminal detection method, and storage medium having program stored therein > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,217,587 B2 - Document ID: US12217587B2 - Status: Granted - Kind: B2 - Application number: 17/625,412 - Filed: 2020-07-10 - Published: 2022-08-25 - Granted: 2025-02-04 - Earliest claimed: 2019-07-12 - Assignees: NEC Corporation - Applicants: NEC Corporation - Inventors: Jun Sakai; Masaki Kitsunezuka; Toshiki Takeuchi; Taichi Ohtsuji; Shoji Nishimura; Yasufumi Hirakawa - Web page: https://patentgrep.com/patent/US12217587B2 ## CPC - G08B 21/02: Alarms for ensuring the safety of persons - H04W 4/023: {using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds} - G08B 21/0247: {System arrangements wherein the alarm criteria uses signal strength} - G08B 21/0266: {System arrangements wherein the object is to detect the exact distance between parent and child or surveyor and item} - G08B 21/22: responsive to presence or absence of persons - G08B 25/10: using wireless transmission systems {(G08B25/009 takes precedence)} - H04W 4/029: Location-based management or tracking services - H04W 4/38: for collecting sensor information - G08B: SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A wireless terminal detection system provided with user position information acquisition means for measuring a position of a reception-side wireless terminal; pattern classification means for classifying movement patterns extracted from position history information of the reception-side wireless terminal into ordinary patterns and non-ordinary patterns based on classification results in which the movement patterns are classified in accordance with times and positions; and determination means for determining whether a transmission-side wireless terminal, which is a transmission source of radio waves received by the reception-side wireless terminal, is a suspicious terminal based on a reception history of radio waves from the transmission-side wireless terminal in time intervals classified as the non-ordinary patterns. ## Claims ### Claim 1 A wireless terminal detection system comprising: at least one memory configured to store instructions; and at least one processor configured to execute the instructions to: measure a position of a reception-side wireless terminal; determine, based on position history information of the reception-side wireless terminal, whether the reception-side wireless terminal is moving or resting at a position measurement date/time indicated by the position history information, and extract, as time intervals of individual movement patterns, respectively, time intervals from when the reception-side wireless terminal starts moving until the moving ends and time intervals from when the reception-side wireless terminal starts resting until the resting ends; classify the movement patterns into ordinary patterns and non-ordinary patterns based on classification results in which the movement patterns are classified in accordance with times and positions; and determine whether a transmission-side wireless terminal, which is a transmission source of radio waves received by the reception-side wireless terminal, is a suspicious terminal based on a reception history of radio waves from the transmission-side wireless terminal in time intervals classified as the non-ordinary patterns. ### Claim 2 (depends on 1) The wireless terminal detection system according to claim 1, wherein the at least one processor is configured to execute the instructions to determine whether or not notification to a user is required based on a number of days that the reception-side wireless terminal has received radio waves from a transmission-side wireless terminal that is a determination target. ### Claim 3 (depends on 1) The wireless terminal detection system according to claim 1, wherein the at least one processor is configured to execute the instructions to determine whether or not notification to a user is required based on a cumulative time period during which the reception-side wireless terminal has received radio waves from a transmission-side wireless terminal that is a determination target. ### Claim 4 A wireless terminal detection device comprising: at least one memory configured to store instructions; and at least one processor configured to execute the instructions to: measure a position of a reception-side wireless terminal; determine, based on position history information of the reception-side wireless terminal, whether the reception-side wireless terminal is moving or resting at a position measurement date/time indicated by the position history information, and extract, as time intervals of individual movement patterns, respectively, time intervals from when the reception-side wireless terminal starts moving until the moving ends and time intervals from when the reception-side wireless terminal starts resting until the resting ends; classify the movement patterns into ordinary patterns and non-ordinary patterns based on classification results in which the movement patterns are classified in accordance with times and positions; and determine whether a transmission-side wireless terminal, which is a transmission source of radio waves received by the reception-side wireless terminal, is a suspicious terminal based on a reception history of radio waves from the transmission-side wireless terminal in time intervals classified as the non-ordinary patterns. ### Claim 5 (depends on 4) The wireless terminal detection device according to claim 4, wherein the at least one processor is configured to execute the instructions to determine whether or not notification to a user is required based on a number of days that the reception-side wireless terminal has received radio waves from a transmission-side wireless terminal that is a determination target. ### Claim 6 (depends on 4) The wireless terminal detection device according to claim 4, wherein the at least one processor is configured to execute the instructions to determine whether or not notification to a user is required based on a cumulative time period during which the reception-side wireless terminal has received radio waves from a transmission-side wireless terminal that is a determination target. ### Claim 7 A wireless terminal detection method comprising: measuring a position of a reception-side wireless terminal; determining, based on position history information of the reception-side wireless terminal, whether the reception-side wireless terminal is moving or resting at a position measurement date/time indicated by the position history information, and extracting, as time intervals of individual movement patterns, respectively, time intervals from when the reception-side wireless terminal starts moving until the moving ends and time intervals from when the reception-side wireless terminal starts resting until the resting ends; classifying the movement patterns into ordinary patterns and non-ordinary patterns based on classification results in which the movement patterns are classified in accordance with times and positions; and determining whether a transmission-side wireless terminal, which is a transmission source of radio waves received by the reception-side wireless terminal, is a suspicious terminal based on a reception history of radio waves from the transmission-side wireless terminal in time intervals classified as the non-ordinary patterns. ### Claim 8 (depends on 7) The wireless terminal detection method according to claim 7, wherein the determining includes determining whether or not notification to a user is required based on a number of days that the reception-side wireless terminal has received radio waves from a transmission-side wireless terminal that is a determination target. ### Claim 9 (depends on 7) The wireless terminal detection method according to claim 7, wherein the determining includes determining whether or not notification to a user is required based on a cumulative time period during which the reception-side wireless terminal has received radio waves from a transmission-side wireless terminal that is a determination target.