MOBILE PHONE SYSTEM AND ZONE SHIFT METHOD

摘要

PROBLEM TO BE SOLVED: To prevent zone shift from frequently being caused. SOLUTION: A requirement of switching of a communication destination to a peripheral station by a control 1 of a mobile phone system resides in that a value resulting from subtracting a reception level of a perch channel of its own station from a reception level of a perch channel of the peripheral station is higher than a reference value (2nd reference value) consecutively over a prescribed number of times of measurements (1st reference value). The control section 1 stars counting time when the mobile phone system 100 is in standby, when communication with its own station is not available within a reference time, the control section 1 registers a perch channel number of the base station to a channel registration section 31. The control section 1 specifies how many perch channels of peripheral stations indicated in notice information received from its own station are registered in the channel registration section 31. The control section 1 sets the 1st reference value to each peripheral station in response to the number of registered perch channels of each peripheral station and stores the result in a peripheral station information recording section 30.