METHOD, BASE STATION, TERMINAL AND COMMUNICATION SYSTEM FOR UPLINK SYNCHRONIZATION

摘要

A method for uplink synchronization, a base station, a terminal and a communication system are disclosed by the present invention. Wherein, the method for uplink synchronization comprises the following steps: receiving a MAC Protocol Data Unit (MAC PDU), which includes a Timing Advance (TA) value, transmitted by the base station; according to the TA value identification information in said MAC PDU, identifying whether said TA value is the TA value of the sounding reference signal; if said TA value is the TA value of the sounding reference signal, performing the time offset adjustment according to the TA value. The embodiments of the present invention can identify whether a TA value is the TA value of the sounding reference signal or the TA value of the Random Access Channel (RACH) detection according to the TA value identification information in the MAC PDU. Only when a TA value in the MAC PDU is the TA value of the sounding reference signal, the corresponding time offset adjustment is performed accordingly, thus ensuring the uplink synchronization performance of the OFDM system.