Patent ID: 7035670
Filing Date: 2006-04-25
Classification: H04W

Abstract:
1. A cellular phone system, comprising: a mobile communication terminal; a first base station that communicates with said mobile communication terminal by using a first frequency; and a second base station that communicates with said mobile communication terminal by using a second frequency, wherein: while said mobile communication terminal is communicating with said first base station by using a channel, the reception quality of said second frequency is measured corresponding to the change of the quality of said channel, and said channel is changed over to said second base station corresponding to said measured reception quality and the change of the quality of said channel, wherein: said cellular phone system, further comprising: a first reception quality measuring means that measures the reception quality of said second frequency at said mobile communication terminal in case that the quality of said channel is within a predetermined first range and when the change of the quality of said channel is larger than a designated value; and a second reception quality measuring means that measures more frequently the reception quality of said second frequency at said mobile communication terminal in case that the quality of said channel is without said predetermined first range, compared with the case that the quality of said channel is within said predetermined first range.