Abstract
PROBLEM TO BE SOLVED: To provide a communication system which can check the state of a communication terminal device with the suppression of a processing load and power consumption.,SOLUTION: The communication system includes: a base station device which is connected to a network; and a communication terminal device which is radio communicably connected to the base station device. Monitoring messages to check the state of the communication terminal device are transmitted and received between the base station device and the communication terminal device at a preset monitoring period. If the base station device does not receive a monitoring message at the preset monitoring period the base station device transmits a monitoring message parameter to surrounding base station devices so as to determine that the communication terminal device is detected based on whether or not the monitoring message is received in the surrounding base station devices within the preset monitoring period.,SELECTED DRAWING: Figure 14,COPYRIGHT: (C)2018JPO&INPIT
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