Patent ID: 6233454
Filing Date: 2001-05-15
Classification: H04W

Abstract:
A mobile station in a mobile communication system of a CDMA (Code Division Multiple Access) type, said mobile station comprising:transceiver means for transmitting and receiving a wide-band diffused signal to and from each of a plurality of base stations servicing respective ones of peripheral cells;reverse diffusing means for reversely diffusing or despreading the wide-band diffused signal received by said transceiver means;received signal level measuring means for measuring a received signal strength indicator (carrier RSSI) specifying wide-band received power measured relative to the wide-band signal received by said transceiver means before the reverse diffusing or despreading by said reverse diffusing means;received signal quality measuring means for measuring a signal to interference noise ratio (SIR) at an output of said reverse diffusing means; andcontrol means for executing a search among said peripheral cells and controlling said received signal quality measuring means to measure the SIR at certain periods and at least when change of the RSSI output from said received signal level measuring means exceeds a predetermined value, and for reporting received signal quality from said peripheral cells to a network through a base station in communication with said mobile station so as to shift said mobile station to a soft hand-over state.