Patent ID: 6597674
Filing Date: 2003-07-22
Classification: H04W

Abstract:
A handover method for a CDMA mobile communication system including a base station and a mobile station, comprising the steps of:compressing traffic channel frames into a compressed signal unit having at least double a number of frames contained in a normal-mode signal unit in the base station; transmitting the compressed signal unit repeatedly from the base station to the mobile station; switching the mobile station between a traffic channel including the compressed signal unit transmitted repeatedly from the base station and a perch channel from another base station; alternating reception frequencies of the mobile station at intervals of a period of the normal-mode signal unit according to frames received from the perch channel, thereby receiving frames alternately from the traffic and perch channels; extracting a system frame number from the frames received from the perch channel; and receiving from the traffic channel a first signal unit containing the second half of a given frame during a first unit period, and a second signal unit containing the first half of a given frame during a second unit period to recover the original state of the given frame by combining the first and second halves at the mobile station when the mobile station is unable to receive the whole given frame in a single signal unit.