| 摘要 |
PURPOSE:To improve the service to a user by allowing a mobile radio equipment to supervise the arrival of a position notice signal from each stationary radio equipment and notifying it in a prescribed alarm tone if the mobile equipment cannot receive a position notice signal from any stationary radio equipment at a prescribed level or over within a prescribed time. CONSTITUTION:If a notice supervisory time expires, a mobile radio equipment 3a checks whether or not a position notice signal from a stationary radio equipment 41 or other stationary radio equipments 42, 43 is received before the expiration. If the position notice signal with a prescribed level or over from any stationary radio equipment is not received, the mobile radio equipments is decided to be located at the outside of the zone to any stationary radio equipment. Then an alarm tone representing it is generated. Thus, even if the connection by the call operation is failed, the user can simply discriminate the failure because the cause is due to the location of out of zone originally and the mobile equipment can make an incoming/outgoing call by moving the equipment 3a to the out of zone. |
