METHOD FOR LOCAL POSITIONING OF AN INFORMATION SECURITY INTRUDER NODE IN MOBILE DATA TRANSMISSION SYSTEMS Russian patent published in 2021 - IPC H04W64/00 

FIELD: data transmission systems.

SUBSTANCE: invention relates to methods for the local positioning of an information security intruder node in mobile data transmission systems in a controlled area or in enclosed spaces, mines, tunnels, with an unlimited and constantly changing number of mobile nodes. The method of local positioning of the intruder node is implemented in Intrusion Detection System (NIDS) devices to ensure information security in mobile data transmission systems. To implement the positioning of the intruder node in closed rooms, mobile sensor nodes are used, the location of which is precisely known at any time and which are able to change the level (power) of their radiation with a given discreteness and transmit this information to the coordinator node, synchronize with a certain accuracy in network and estimate the level of the received signal from other sensor nodes with the same accuracy for all NIDS nodes. Sensor nodes determine the identification numbers (addresses) of other nodes (including the address of the offending node) and transmit to the coordinator node data about their own location, the level of signals from other sensor nodes and other data provided for by the information exchange protocol, as well as relay similar data from other sensor nodes (if they are not within the coverage area of ​​the coordinator node). At the same time, no additional information exchange is conducted with the offending node and data about its location are not requested. In addition, the transmitter power of the intruder's mobile device is not known a priori. The proposed method is based on the use of multiple measurements of the power level of the RSSI signal received by the NIDS sensor nodes from each other for different gradations of the received signal level and gradations of the power level of the transmitters, with the subsequent conversion of the signal levels into distance, for the electromagnetic profile of the monitored room topology at the frequency of the mobile data transmission networks. The collected data are statistically processed, measurement errors are excluded, the measurement error is estimated, and databases of calibration measurements are compiled, by which the distances and absolute errors of distance determination are estimated. When determining the location of the intruder using the trilateration method, from all the nodes that "see" the intruder determine the possible sets of space regions (based on distances from the calibration measurement database) of the "intersection" of the geometric place of the points of the intruder's possible location from different mobile sensor nodes.

EFFECT: local positioning of an information security intruder node in mobile data transmission systems.

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