Patent ID: 7031277

Claim:
A handover controlling method in a radio network controller (RNC) connected to a first Node B and a second Node B in a mobile communication system where an Uplink Synchronous Transmission Scheme (USTS) service occurs between the first Node B and a user equipment (UE) within a cell of the first Node B and the UE hands over when the UE is located in a handover area across cell areas of the first Node B and the second Node B, the cell area of the second Node B being adjacent to the cell area of the first Node B, the method comprising the steps of: determining if handover for the UE is possible; transmitting handover information to the second Node B if handover is possible, the handover information including a scrambling code of the UE, a scrambling code time offset representing a time difference between a start point of the scrambling code used for data communication between the UE and the first Node B and a start point of an uplink data frame, and a channelization code for a transmission channel of the data; and transmitting a command to the UE through the first Node B, requesting the UE to hand over to the second Node B if the RNC receives a response message for the handover information from the second Node B indicating that handover is possible.