MULTISYSTEM WIRELESS COMMUNICATION APPARATUS

摘要

A wireless communication apparatus capable of being communicated by employing communication systems is provided with: communication units containing a system-A communication unit for performing a communication operation by a wireless signal using a GSM communication system, and a system-B communication unit for performing a communication operation by an wireless signal using a UMTS communication system; a power supply voltage detecting unit for detecting a voltage of a power supply applied to the communication units in a predetermined time period; and a power supply control unit operated in such a control manner that when the power supply voltage is lower than, or equal to the final voltage of the GSM communication system, the communication operation by the system-A communication unit is stopped, whereas the power supply voltage is higher than the final voltage of the UMTS communication system, the communication operation by the system-B communication unit is continuously carried out.