of a plurality of component carriers belonging to a cell according to the process 50 the ue manages the ta functionality in the plurality of component carriers belonging to the same cell with a common timing advance command that is when a timing advance command is received in one of the component carriers belonging to a cell the ue jointly applies the ta functionality for the component carriers belonging to the cell take an example according to fig1 when a timing advance command is received in any one of the links l 2 l 4 belonging to the cell c 2 the ue applies the ta functionality for the links l 2 l 4 according to the timing advance command in this situation the network does not need to generate and send timing advance command duplications for the links l 2 l 4 and on the other hand the ue does not need to handle the ta functionality for each component carrier belonging to the same cell as a result the signaling quantity is reduced and furthermore complexity problem of separately configuring each component carrier is avoided for ta functionality operation when the ta functionality is applied in the plurality of component carriers belonging to the same cell for updating a timing advance value corresponding to the cell the ue starts or restarts a time alignment timer for those component carriers according to the timing advance command therefore when the time alignment timer expires.