Method for uplink synchronisation in an LTE system and related mobile device

摘要

A method utilized in a mobile device (110) includes: starting a time alignment timer (1103) when receiving a time alignment message transmitted by a base station (105a), wherein the time alignment timer (1103) is used for determining whether the mobile device (110) is synchronized with the base station (105a) on uplink timing, and the time alignment message is utilized to update timing advance for the mobile device (110); and ignoring at least a first control message sent from the base station (105a) after the time alignment timer (1103) expires.