| 摘要 |
PURPOSE:To enable a slave equipment to terminate or make a telephone call without newly registering an ID or position even unless a master equipment and the slave equipment are at a radio wave reachable distance. CONSTITUTION:Each master equipment 13 when receiving information from a slave equipment 14 by its radio part 21 measures the electric field strength of the received radio wave by the radio part 21 and only the master equipment 13 having the highest received electric field strength can occupy the frequency band of a sent radio wave and send and receive information to and from the specific slave equipment 14. When each slave equipment 14 receives incoming information from a master equipment 13 by its radio part 32, only the slave equipment 14 having the highest received electric field strength occupies the frequency band of a sent radio wave and sends and receives information to and from the specific master equipment 13. Consequently, when the incoming information is sent and received or when communication start information is sent and received, the master equipment and slave equipment having the largest reception strength of the received waves terminate and have a communication. |
