PATENT: IMSI / TMSI / RNTI mapping to a particular mobile device
US11109221B1
This is one in a series of patents related to the RF signaling work at Ubiety Technologies. This particular patent contains claims related to the reverse engineering of the uplink and downlink LTE signals to signal unique cellular devices.
You can find the patent in it's entirety here: https://patents.google.com/patent/US11109221B1/en