METHOD AND DEVICE FOR HANDLING TIME ALIGNMENT TIMER IN MULTI-CARRIER COMMUNICATION SYSTEM

摘要

Provided in the present invention are a method and device for handling a time alignment timer (TAT) in a multi-carrier communication system. The method comprises: under the premise of having multiple groups, a UE maintaining TAT time intervals respectively for each group, where cells using a same TA belong to one group; and the UE maintaining an uplink synchronization state for the cells in the group on the basis of if the TAT corresponding to each group has expired. The present invention solves the problem in the related art, where the TAT is maintained only for a primary cell, thereby causing the incapability of UE of knowing directly the uplink synchronization state of an auxiliary cell group, of a base station-side being incapable of receiving normally uplink signals of these cells as the UE may perform an uplink transmission when the auxiliary cell group is in a desynchronized state. The solution adapts to the requirements of the multi-carrier communication system for multiple TA and for multiple groups.