Communication system, relay device and communication method
A technology of relay devices and communication devices, which is applied in communication systems, relay devices, and communication fields, can solve the problems of increasing communication devices, increasing communication load, and increasing the data volume of communication devices, so as to achieve safety functions and high security The effect of the function
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[0044] Hereinafter, the present invention will be specifically described based on drawings showing embodiments of the present invention. figure 1 It is a block diagram showing the configuration of the communication system of the present invention. The communication system of the present embodiment is a system in which a plurality of ECUs (communication devices) 4 mounted on a vehicle (not shown in the figure) perform data transmission and reception and cooperate with each other, and includes a plurality of first relay devices 1 in addition to the ECU 4 and a second relay device 2 to form a network. The plurality of ECUs 4 are divided into several (three, a to c in the illustrated example) groups (communication device groups), and one first relay device 1 is provided in each group. In addition, in figure 1 Among them, for the ECU 4 and the first relay device 1, the parts belonging to group a are marked with symbols such as ECU 4 a and the first relay device 1 a, and the parts...
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