Methods, machines, and network-connected equipment used to determine the location of mobile devices

Abstract

The invention relates to a method, machine, and networked apparatus for determining the location of a mobile device. Determining the location of a target mobile device in a wireless communication network using time-division duplexing (TDD) can utilize a wireless reference signal from another mobile device with a known location. Another mobile device can be configured to transmit a wireless reference signal by using cross-link interference (CL1) where the target mobile device receives a signal during the cycle in which the target mobile device is configured to receive a downlink (DL) transmission. The target mobile device then transmits another wireless reference signal, which is received by the base station, which also receives a wireless reference signal from another mobile device. The timing of the different signals received at the mobile device and the destination base station can be used to determine the location of the mobile device.