| 摘要 |
PURPOSE:To enable accurate channel switching on the boundary of the minimum cell by distinguishing between the use of two channel switching decision references corresponding to the magnitude of the change of the reception level in the mobile device. CONSTITUTION:The reception level of the mobile device is inputted to long- interval average units LTA0 to LTAN and short-interval average units STA0 to STAN. To the units LTA0-STA0, the reception level of communication cell is inputted. To the units LTA1 to LTAN and STA1 to STAN, the reception level of the adjacent cell is inputted. The output of the unit LTA0 is inputted to an addition unit SN, to which a small hysteresis margin is added. The output of the unit STA0 is inputted to an addition unit SW, to which a large hysteresis margin is added. Thus, the output of comparators C1 and C2 are inputted to a gate OR1 by distinguishing between the use of the two channel decision references corresponding to the intensity of the change of the reception level, and the channel switching is started by the output of the gate OR1. |
