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Pub. No.:    WO/2017/154828    International Application No.:    PCT/JP2017/008751
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Tue Mar 07 00:59:59 CET 2017
IPC: H04L 12/40
H04L 12/28
Applicants: HONDA MOTOR CO., LTD.
Inventors: WAKITA Kazuyoshi
脇田 和慶
Provided is a communications system provided with a transmission device for transmitting information as a communication message to a network at a prescribed frequency that corresponds to type of the information, and a reception device for receiving the transmitted communication message, wherein: type 1 information transmitted at a first frequency and type 2 information transmitted at a second frequency higher than the first frequency are transmitted to the network as communication messages different from each other; and the reception device detects, on the basis of the number of times the type 2 information is received, the occurrence of an abnormal state in the network in a period from when the type 1 information is received until when the next type 1 information is received.