A method for synchronizing between an access gateway and a plurality of base stations is provided. The method comprises: at the gateway, determining a synchronization period corresponding to a packet to be transmitted to the base stations, said synchronization period being used as a scheduling granularity of the base stations, adding information indicating the synchronization period to the header of the packet, and transmitting the packet to the corresponding base stations; and at each of the base stations, obtaining, upon receipt of the packet, the synchronization period corresponding to the packet based on the information in the header of the packet, storing the packet in a buffer, determining, at the time of scheduling, synchronization periods which have terminated before the time of scheduling based on the synchronization periods corresponding to the stored packets, and scheduling packets corresponding to the determined synchronization periods according to a predetermined scheduling strategy.