Methods, a network device and a terminal device for time advance adjustment are disclosed. A method comprises receiving a time advance, TA, command from a network device; determining a TA granularityor range; and determining a TA value based at least partly on the TA command and the TA granularity or range, wherein different numerologies are configured for at least two carriers and/or at least two bandwidth parts (BWPs) in one carrier, wherein the at least two carriers and/or the at least two BWPs serve the terminal device and/or the terminal device supports at least one numerology.