Device for controlling operation of modem for vehicle in order to prevent battery discharge and method for controlling same

A method for controlling modem operation for inhibiting battery discharge in a vehicle, the method comprising:

• setting a modem in a standby state in order to start a vehicle or to receive a signal from a user when the vehicle stalls;
• counting at least one of a number of reciprocations between a normal service state and a no-service state of a communication state of the and a number of repetitions of communication network registration of the modem by monitoring the communication state of the modem;
• cutting off, by a TCU of the vehicle, a power supplied to the modem, even if a standby time preconfigured in the modem has not elapsed and no power supply termination request is received from the modem by the TCU, when the number of reciprocations counted by the TCU or the number of repetitions of communication network registration is larger than or equal to a preconfigured reference value;
• maintaining, by the TCU, the modem in the standby state for the preconfigured standby time, if the number of reciprocations between the normal service state and the no-service state and the number of repetitions of communication network registration are both below the preconfigured reference value, in order to receive a signal from a user device when the vehicle stalls and to start the vehicle in response to the received signal;
• sending, by the modem, a power supply termination request to the TCU if the preconfigured standby time elapses;
• cutting off, by the TCU, the power supplied to the modem if the power supply termination request is received by the TCU;
• determining whether the power supplied from the TCU to the modem is interrupted;
• and
• changing from the standby state to a stop state when it is determined that the power supplied from the TCU is interrupted,
• wherein the preconfigured standby time is set in consideration of a current consumption of the modem under the normal service state.