APPARATUS AND A METHOD FOR TRANSMITTING AND RECEIVING CONTROL INFORMATION FOR MBMS SERVICES IN A MOBILE COMMUNICATION SYSTEM, ESPECIALLY CONCERNED WITH TRANSMITTING CONTROL INFORMATION TO SUPPORT MBMS SERVICES

摘要

PURPOSE: An apparatus and a method for transmitting and receiving control information for MBMS(Multimedia Broadcast/Multicast Service) services in a mobile communication system are provided to efficiently support MBMS services by enabling UEs(User Equipments) receiving an S-CCPCH(Secondary Common Channel Physical CHannel) not mapped with an MCCH(MCCH) to reliably receive control information for MBMS services, as well as UEs receiving an MCCH-mapped S-CCPCH. CONSTITUTION: If an event to transmit MBMS control information is generated(521), an RNC(Radio Network Controller) transmits an MBMS paging message to a UE in a CELL_FACH(Forward Access CHannel) state(531). If the UE, which has received an S-CCPCH not mapped with an MCCH, receives the MBMS paging message, the UE switches to an S-CCPCH mapped with the MCCH and receives the FACH of the MCCH-mapped S-CCPCH(541). The UE receives MBMS control information through the MCCH, so the UE can be provided MBMS services using the MBMS control information(551,552).