Patent ID: 7307971

Claim:
A method for transmitting broadcast data from neighboring Node Bs to one of a plurality of user equipments (UEs) when the UE moves to a handover region between the neighboring Node Bs, in a code division multiple access (CDMA) mobile communication system having at least two neighboring Node Bs, a radio network controller (RNC) connected to the Node Bs, and the UEs located in cells occupied by corresponding Node Bs, wherein the Node Bs transmit data asynchronously and transmit common broadcast data to the UEs within the cells of the Node Bs, the method comprising the steps of: transmitting a first difference between a transmission start point of a first system frame from a first Node B of the neighboring Node Bs and a reception start point of a second system frame corresponding to the first system frame, received from a second Node B out of the neighboring Node Bs, from the first Node B to the RNC; transmitting a second difference between a transmission start point of the second system frame from the second Node B and a reception start point of the first system frame corresponding to the second system frame, received from the first Node B, from the second Node B to the RNC; calculating a third difference between the transmission start points of the first and second system frames from the first and second differences by dividing a difference between the first and second differences by 2; and informing the first and second Node Bs of a transmission time point of the frames of the broadcast data according to the third difference.