Transmitting and receiving antenna system of LPWAN repeater and control method thereof

In a transmitting and receiving antenna system of repeater for a Low-power wide-area network (LPWAN) including a first antenna and a second antenna that selected to an antenna for transmitting according to a user's setting, a switch coupled to each of the first antenna and the second antenna, a third antenna for receiving, a RF transmitter connected to the first antenna and the second antenna through the switch, a RF receiver connected to the third antenna for receiving;

• and a controller for controlling the RF transmitter and the RF receiver through switching of the switch, a method of controlling the transmitting and receiving antenna system of the repeater for the Low-power wide-area network (LPWAN) comprising:
• a first step for determining one of the first antenna or the second antenna as a transmitting mode antenna according to a user setting;
• a second step for changing to an automatic direction determination mode of the second antenna, if the second antenna is determined as the transmitting mode antenna,
• wherein the first antenna transmits signals during a transmitting mode period, if the first antenna is determined as the transmitting mode antenna;
• a third step for transmitting a pilot message including a response request message in the uplink direction by initializing the directivity of the second antenna;
• a fourth step for analyzing a RSSI of the response message in the analyzer, when the response message for the pilot message is received after a certain period of time;
• a fifth step for generating a control signal to change the position angle of the second antenna by the n-th order as amount of an allowable angle by repeating the third step and the fourth step up to n times;
• a sixth step for determining the direction in which the RSSI of the response message is analyzed in the highest in the analyzer of the controller, after the n-th repetition;
• a seventh step for generating a control signal for determining the directivity of the second antenna in the generator of the controller based on the determination of the analyzer;
• an eighth step for transmitting signals during the remaining transmitting mode, after tilting the second antenna according to the control signal;
• and
• a ninth step for receiving signals through the third antenna, when the transmitting mode is over, the transmitting mode is transferred to a receiving mode, which is the next cycle, according to the control signal.