The present invention discloses a method and an apparatus for synchronization in a communication system, the method includes: detecting whether a user equipment is in an uplink out-of-synchronization state; triggering, by a downlink scheduling entity, an uplink enhanced random access synchronization process, if the user equipment is in the uplink out-of-synchronization state; and obtaining, by an uplink scheduling entity, a user equipment identifier sent by the user equipment on which the uplink enhanced random access synchronization process is triggered, and informing the downlink scheduling entity via an interaction with the downlink scheduling entity that uplink synchronization of the user equipment is restored. By employing the method and the apparatus of the invention, the uplink synchronization is accomplished by using the existing enhanced random access technology of the current system and via the interaction between the uplink and downlink scheduling entities, the delay of the synchronization may be shortened effectively, the data transmission efficiency and the system resource utilization are improved, and the normal sending and transmitting of the downlink data may be guaranteed.