RADIO COMMUNICATION SYSTEM USING INDUSTRIAL, SCIENCE, AND MEDICAL (ISM) BAND

摘要

Provided is a radio communication system. The radio communication system comprises: a base station; a donor unit which receives a communication signal from the base station or transmits a communication signal to the base station; and a remote unit which receives the communication signal from the donor unit by using an ISM band and then provides the communication signal to a terminal or receives the communication signal from the terminal and then sends the communication signal by using the ISM band. Here, the donor unit comprises a donor antenna constituted with a dual port by including an internal antenna and an external antenna so as to receive the communication signal from the base station when a downlink is conducted and send the communication signal to the base station when an uplink is conducted, a reception level comparative part which compares a communication signal level received through the internal antenna with a predetermined reference level and then generates a result signal when the communication signal level received through the internal antenna is less than the predetermined reference level; a display part which receives the result signal from the reception level comparative part to display the result signal; a switch part which allows the communication signal to be received through the external antenna in a manner in which the internal antenna is not operated and the outer antenna is operated, when the communication level is less than the predetermined reference level; and a link antenna which amplifies and modulates the communication signal received through the internal antenna or the external antenna to send the communication signal to the remote unit.;COPYRIGHT KIPO 2016