Method and apparatus for correcting time reference errors in a mobile telephone operating in UMTS mode

摘要

Time base error in a dual mode mobile telephone is correct by measuring the time of arrival of a signal (6) comparing the time of arrival with an expected time of arrival (2). The time base error is corrected with a measured error signal (10, 12). An average time base error is derived from the measured errors over a predetermined period of time (14). From this, predicted error is used to correct the expected time of arrival of a signal (4). IMAGE