Mobile communication terminal including automatic frequency control function

A control unit which alternately sets a wake-up period and sleep period in a standby state and which allows a radio unit to receive a radio signal transmitted from a base station in the wake-up period, the control unit comprising:

• a first searcher configured to detect a path of the radio signal transmitted from a first base station on standby based on a reception signal of the radio unit in the wake-up period;
• a determiner configured to determine whether or not the path from the first base station has been detected by the first searcher;
• second searcher for detecting the paths of the radio signals transmitted from the first base station and a second base station existing in the neighbor of the first base station based on the reception signal of the radio unit in response to a determination result of the determiner, when the path is not detected by the first searcher;
• an error detector configured to detect an error of a reception frequency based on the reception signal of the detected path in response to the determination result of the determination means, when the path is detected by the first searcher and for detecting the error of the reception frequency based on the reception signal of the path detected by the second searcher, when the path is not detected by the first searcher;
• and
• controller configured to control the reception frequency of the radio unit so as to decrease the frequency error detected by the error detector.

A program stored in a storage device, comprising:

• first means for instructing a control unit to detect a path of a radio signal transmitted from a first base station on standby based on a reception signal of a radio unit in a wake-up period;
• second means for instructing the control unit to determine whether or not the path from the first base station has been detected by the first means;
• third means for instructing the control unit to detect the path of the radio signals transmitted from the first base station and a second base station existing in the neighbor of the first base station based on the reception signal of the radio unit in response to a determination result of the second means, when the path is not detected by the first means,
• fourth means for instructing the control unit to detect an error of a reception frequency based on the reception signal of the path in response to the determination result of the second means, when the path is detected by the first means, and detect the error of the reception frequency based on the reception signal of the path detected by the third means, when the path is not detected by the first means;
• and
• fifth means for instructing the control unit to control the reception frequency of the radio unit so as to decrease the frequency error detected by the fourth means.