Patent ID: 7099667
Filing Date: 2006-08-29
Classification: H04B

Abstract:
1. A method for a CDMA communication system mobile radio terminal to search for a base station with which to communicate, comprising: receiving synchronization acquisition signals sent from a plurality of base stations at different timings, applying despreading processing to the received synchronization acquisition signals, measuring reception power levels of the received synchronization acquisition signals, comparing the reception power levels and detecting a highest reception power level among the received synchronization acquisition signals; comparing the detected highest reception power level with a threshold corresponding to a minimum allowable reception power level, controlling timing of the despreading processing when the detected highest reception power level is at least equal to the threshold so as to be synchronized with the synchronization acquisition signal with the detected highest reception power level and executing processing to prepare to communicate with the base station that has sent the synchronization acquisition signal with the detected highest reception power level; and when the detected highest reception power level is lower than the threshold, adding a reception power value of the synchronization acquisition signal with the detected highest reception power level to a reception power value of another synchronization acquisition signal sent from another base station which is different from the base station that has sent the synchronization acquisition signal with the detected highest reception power level, and considering, when a resultant reception power level is at least equal to the threshold, that the reception power level of the synchronization acquisition signal with the detected highest reception power is at least equal to the threshold, controlling timing of the despreading processing so as to be synchronized with the synchronization acquisition signal with the detected highest reception power level and executing processing to prepare to communicate with the base station that has sent the synchronization acquisition signal with the detected highest reception power level.