A user equipment may identify one or more trigger factors associated with an assistance mode. The assistance mode may include a second radio associated with a second radio access technology (RAT) assisting a first radio associated with a first RAT. The UE may then measure a frequency offset between a first clock of the first radio and a second clock of the second radio based at least in part on the one or more trigger factors. The first clock may be associated with a first oscillator crystal, and the second clock may be associated with a second oscillator crystal. The UE may then store the frequency offset for use by the first radio and the second radio in the assistance mode.