# US 2019/0174452 A1 · Detection of mobile transmitters in an office environment > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0174452 A1 - Document ID: US20190174452A1 - Status: Published application - Kind: A1 - Application number: 16/202,230 - Filed: 2018-11-28 - Published: 2019-06-06 - Earliest claimed: 2017-12-01 - Assignees: NEC Corporation Of America - Applicants: NEC Corporation Of America - Inventors: Tsvi LEV; Yaacov HOCH; Doron GONEN - Web page: https://patentgrep.com/patent/US20190174452A1 ## CPC - H04W 64/003: {locating network equipment} - G01S 5/0264: {at least one of the systems being a non-radio wave positioning system} - H04B 17/27: for locating or positioning the transmitter - H04W 4/02: Services making use of location information - H04W 8/08: Mobility data transfer - H04W 12/12: Detection or prevention of fraud - H04W 24/02: Arrangements for optimising operational condition - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04W 56/009: {Closed loop measurements} - 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) - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - H04B: TRANSMISSION ## Abstract A computer implemented method of detecting unauthorized mobile wireless transmitters, comprising using one or more processors adapted for obtaining, from one or more radio frequency (RF) sensors deployed in a monitored location, RF sensory data relating to a plurality of transmissions transmitted by one or more of a plurality of mobile wireless transmitters, detecting a change in a location of one or more of the mobile wireless transmitters by analyzing the RF sensory data, classifying one or more of the mobile wireless transmitters as unauthorized in case the detected location change deviates from one or more mobility rules and outputting an indication of the classification. ## Claims ### Claim 1 A computer implemented method of detecting unauthorized mobile wireless transmitters, comprising: using at least one processor adapted for: obtaining, from at least one radio frequency (RF) sensor deployed in a monitored location, RF sensory data relating to a plurality of transmissions transmitted by at least one of a plurality of mobile wireless transmitters; detecting a change in a location of said at least one mobile wireless transmitter by analyzing said RF sensory data; classifying said at least one mobile wireless transmitter as unauthorized in case said detected location change deviates from at least one mobility rule; and outputting an indication of said classification. ### Claim 2 (depends on 1) The computer implemented method of claim 1, further comprising creating a spatiotemporal mobility pattern of said at least one mobile wireless transmitter based on said detected location change. ### Claim 3 (depends on 1) The computer implemented method of claim 1, wherein said at least one mobility rule is a member of a group consisting of: at least one predefined mobility pattern, a location of said at least one mobile wireless transmitter, a timing of at least one of said plurality of transmissions, a type of said transmission, a protocol of a timing of at least one of said plurality of transmissions, a size of a timing of at least one of said plurality of transmissions, an identification (ID) of said at least one mobile wireless transmitter and an authentication of said at least one mobile wireless transmitter. ### Claim 4 (depends on 1) The computer implemented method of claim 1, wherein said at least one RF sensor is adapted to intercept a plurality of signals of said transmission, said analysis comprises identifying said location change according to identification of at least one signal characteristic of said plurality of signals, said at least one signal characteristic is a member of a group consisting of: a signal strength, a signal angular distribution and a signal propagation delay. ### Claim 5 (depends on 1) The computer implemented method of claim 1, wherein said at least one RF sensor comprises at least one Doppler Effect sensor adapted to capture at least one Doppler shift in at least one carrier signal of at least one of said plurality of transmissions, said analysis comprises identifying said location change according to said identified at least one Doppler shift. ### Claim 6 (depends on 1) The computer implemented method of claim 1, further comprising obtaining said RF sensory data from a plurality of RF sensors, said analysis comprises identifying said location change by triangulating an origin point of at least some of said plurality of transmissions which is indicative of a location of said at least one mobile wireless transmitter. ### Claim 7 (depends on 1) The computer implemented method of claim 1, wherein said analysis further comprising correlating said location change with a carrier location change of a carrier hosting said at least one mobile wireless transmitter detected by analyzing location sensory data obtained from at least one location sensor, said carrier is a member of a group consisting of: a person, a mobile robotic device and a drone. ### Claim 8 (depends on 7) The computer implemented method of claim 7, wherein said at least one location sensor is an acoustic sensor adapted to intercept a sound generated by said carrier. ### Claim 9 (depends on 7) The computer implemented method of claim 7, wherein said at least one location sensor is an air pressure sensor adapted to identify at least one air pressure shift induced by said carrier. ### Claim 10 (depends on 7) The computer implemented method of claim 7, wherein said at least one location sensor is a motion sensor adapted to identify a motion of said carrier. ### Claim 11 (depends on 7) The computer implemented method of claim 7, wherein said at least one location sensor is an imaging sensor adapted to capture at least one image of at least part of said monitored location, said at least one image is analyzed to identify said carrier. ### Claim 12 (depends on 1) The computer implemented method of claim 1, wherein said classification is further based on an identification of said at least one mobile wireless transmitter. ### Claim 13 (depends on 1) The computer implemented method of claim 1, wherein said classification is further based on an authentication sequence conducted with said at least one mobile wireless transmitter. ### Claim 14 (depends on 1) The computer implemented method of claim 1, further comprising initiating at least one action according to said classification, said at least one action is a member of a group consisting of: generating an alert, preventing an access initiated by said at least one mobile wireless transmitter to at least one network resource of said monitored location, intercepting said transmission, interrupting said transmission and invoking at least one deception measure. ### Claim 15 (depends on 12) The computer implemented method of claim 12, further comprising interrupting at least some of said plurality of transmissions using at least one RF transmitter adapted to jam said transmission according to a location of said at least one mobile wireless transmitter. ### Claim 16 A system for detecting unauthorized mobile wireless transmitters, comprising: at least one processor adapted to execute code, said code comprising: code instructions to obtain, from at least one radio frequency (RF) sensor deployed in a monitored location, RF sensory data relating to a plurality of transmissions transmitted by at least one of a plurality of mobile wireless transmitters; code instructions to detect a change in a location of said at least one mobile wireless transmitter by analyzing said RF sensory data; code instructions to classify said at least one mobile wireless transmitter as unauthorized in case said detected location change deviates from at least one mobility rule; and code instructions to output an indication of said classification.