Method and apparatus for uplink synchronization control

A computer-implemented base station, comprising:

• a measurement module, to respectively measure uplink component carriers of a user equipment (UE) to respectively obtain uplink transmission timing adjustment amount of the uplink component carriers;
• a timer module, to maintain a timing alignment timer (TAT) for the UE;
• and
• an adjustment command module, to generate a timing adjustment command which comprises at least one of piece of information of the uplink transmission timing adjustment amount of the uplink component carriers obtained by the measurement module through measurement before the TAT maintained by the timer module expires, and to send the timing adjustment command to the UE, wherein each piece of information of the uplink transmission timing adjustment amount corresponds to one uplink component carrier among the uplink component carriers.

A computer-implemented user equipment, comprising:

• a receiving module, to receive a timing adjustment command;
• a timer module, to maintain a timing alignment timer (TAT), start or restart the TAT when the receiving module receives the timing adjustment command;
• and
• an uplink adjustment module, to instruct a physical layer to implement uplink transmission timing adjustment according to uplink transmission timing adjustment amount for at least one of piece of information of the uplink component carriers comprised in the timing adjustment command when the receiving module receives the timing adjustment command before the TAT of the timer module expires, wherein each piece of information of the uplink transmission timing adjustment amount corresponds to one uplink component carrier among the uplink component carriers.