A user equipment terminal (UE) operates in a wireless network. The UE receives, from a base station, timing advance parameter values which indicate a time difference measured by the base station between uplink and downlink for a band occupied by one or more serving cells. The UE calculates a length of a post-measurement gap (post-MG) time period for the one or more serving cells based on the timing advance parameter values. The post-MG time period is after a measurement gap before uplink transmission. The UE then sends an indication of the length of the post-MG time period to the base station.