APPARATUS AND METHOD OF RECEIVING TIME ALIGNMENT COMMAND IN WIRELESS COMMUNICATION SYSTEM

摘要

PURPOSE: A method and an apparatus for receiving time sync in a wireless communications system are provided to reduce the load of signaling for keeping UL sync between a BS and a UE. CONSTITUTION: A UE(User Equipment) receives information about a time sync group from a BS(Base Station)(S810). The BS transmits a time sync value to the UE in case the BS needs to adjust the UL(UpLink) time sync of serving cells belonging to a specific serving cell or a specific time sync group(S820). The UE applies the time sync value to the serving cell belonging to the time sync group(S830).