Abstract
PROBLEM TO BE SOLVED: To provide a communication system capable of confirming a state of a communication terminal device while suppressing a processing load and power consumption.,SOLUTION: A communication system comprises: a base station device connected to a network; and a communication terminal device wirelessly communicably connected to the base station device. A monitoring message for confirming a state of the communication terminal device is exchanged between the base station device and the communication terminal device at a predetermined monitoring cycle. Based on whether the monitoring message is received by a peripheral base station device within the predetermined monitoring cycle the base station device determines whether the communication terminal device is detected.,SELECTED DRAWING: Figure 14,COPYRIGHT: (C)2020JPO&INPIT
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SUMMARY
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