Patent ID: 6711149
Filing Date: 2004-03-23
Classification: H04W

Abstract:
A handover method in CDMA mobile communications for transmitting and receiving radio frames having a predetermined length between a mobile station and a base station, and spreading an upstream traffic channel signal between the mobile station and the base station by a spreading code and then transmitting the spread signal, comprising:measuring a time difference at the mobile station between a radio frame of a traffic channel from a first base station in communication with the mobile station and a radio frame of a perch channel from a second base station; sending the time difference information to the first base station; sending to the second base station the time difference information and a frame number of the radio frame of the traffic channel from the first base station; and performing a phase correction of the spreading code in the second base station according to the time difference information and the frame number, thereby bringing the phase of the spreading code for despreading the radio frame in the upstream traffic channel in the second base station into coincidence with the phase of the spreading code in the upstream traffic channel transmitted from the mobile station.