Patent ID: 7532881
Filing Date: 2009-05-12
Classification: H04M

Abstract:
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.