Patent ID: 7027816
Filing Date: 2006-04-11
Classification: H04W,Y02D

Abstract:
1. A method for changing over to a different frequency at a cellular phone system, in which a mobile communication terminal, a first base station and a second base station, and a base station controlling apparatus are provided, wherein: said first base station communicates with said mobile communication terminal by setting a channel using a first frequency, and said second base station communicates with said mobile communication terminal by setting a channel using a second frequency, and said mobile communication terminal measures first reception quality in said first frequency during the communication with said first base station by setting a channel, and also said mobile communication terminal measures second reception quality in said second frequency corresponding to said measured first reception quality during the communication with said first base station by setting a channel, and said mobile communication terminal is controlled to communicate with said second base station by changing over the channel from said first base station to said second base station corresponding to said first and second reception quality, wherein: said method for changing over to a different frequency, comprising the step of: controlling to change the condition measuring said second reception quality corresponding to the moving velocity of said mobile communication terminal, changing a second threshold value and a third threshold value corresponding to said moving velocity of said mobile communication terminal, when said condition measuring said second reception quality is controlled to change; and measuring said second reception quality when said first reception quality is less than said changed second threshold value.