Apparatus and method for limiting communication range of fixed wireless terminal

1. An apparatus for limiting a communication range of a fixed wireless terminal, comprising:

a fixed device for periodically radio-transmitting communication maintaining data, wherein the communication maintaining data comprises a secret code, a channel code and a communication command code; and

a mobile device to receive the communication maintaining data via a first wireless communication channel and to enable communication between the mobile device and a base station via a second wireless communication channel only when the communication maintaining data is being received by the mobile device;

the fixed device comprising a transmitting processor for controlling generation of the communication maintaining data, and a transmitting unit for generating and radio-transmitting the communication maintaining data under the control of the transmitting processor; and

the mobile device comprising a battery for supplying power, a CPU for taking charge of mobile telecommunication, a transceiver unit for implementing communication under the control of the CPU, a voice processing unit, a handset unit having a speaker and a microphone, a receiving unit for receiving the communication maintaining data from the transmitting unit of the fixed device, and a receiving processor for controlling operation of the CPU which administrates entire functions of the mobile phone by judging whether or not the communication maintaining data inputted through the receiving unit corresponds to that stored in the receiving processor.

2. The apparatus as claimed in claim 1 , wherein the fixed device further comprises a charging unit for charging operation power to the battery of the mobile device.

3. The apparatus as claimed in claim 1 , wherein the transmitting unit of the fixed device and the receiving unit of the mobile device communicate with each other using an allowable frequency which can be used without obtaining separate permission.

4. A method for limiting a communication range of a fixed wireless terminal, the fixed wireless terminal comprising a fixed device for periodically radio-transmitting communication maintaining data and a mobile device serving as a mobile phone for communicating with a base station only when the communication maintaining data is inputted thereto from the fixed device, the method comprising the steps of:

generating and periodically radio-transmitting the communication maintaining data through a transmitting unit in the fixed device, wherein the communication maintaining data comprises a secret code, a channel code and a communication command code;

receiving the communication maintaining data into a receiving unit in the mobile device via a first wireless communication channel, and judging by a receiving processor in the mobile device whether or not the received communication maintaining data corresponds to communication maintaining data stored in the receiving processor;

outputting a communication permitting signal from the receiving processor to a CPU in the mobile device when the inputted communication maintaining data corresponds to the communication maintaining data stored in the receiving processor, the communication permitting signal to maintain communication between the mobile phone and the base station via a second wireless communication channel; and

outputting a communication forbidding signal from the receiving processor to the CPU in the mobile device when the inputted communication maintaining data does not correspond to the communication maintaining data stored in the receiving processor, the communication forbidding signal to interrupt communication between the mobile phone and the base station via the second wireless communication channel.

5. The method as claimed in claim 4 , wherein the transmitting unit of the fixed device and the receiving unit of the mobile device communicate with each other using an allowable frequency which can be used without obtaining separate permission.