US 12,425,266 B2
Communication device, communication system, and communication method
Nobuyuki Kobayashi, Yokkaichi (JP); Makoto Mashita, Yokkaichi (JP); Masakatsu Moriguchi, Yokkaichi (JP); Takeshi Hagihara, Yokkaichi (JP); Ryo Yamane, Osaka (JP); Ichiro Kanda, Osaka (JP); and Tatsuya Izumi, Osaka (JP)
Assigned to AutoNetworks Technologies, Ltd., Yokkaichi (JP); Sumitomo Wiring Systems, Ltd., Yokkaichi (JP); and Sumitomo Electric Industries, Ltd., Osaka (JP)
Appl. No. 18/557,311
Filed by AutoNetworks Technologies, Ltd., Yokkaichi (JP); Sumitomo Wiring Systems, Ltd., Yokkaichi (JP); and Sumitomo Electric Industries, Ltd., Osaka (JP)
PCT Filed Mar. 18, 2022, PCT No. PCT/JP2022/012726
§ 371(c)(1), (2) Date May 14, 2024,
PCT Pub. No. WO2022/230447, PCT Pub. Date Nov. 3, 2022.
Claims priority of application No. 2021-078007 (JP), filed on Apr. 30, 2021.
Prior Publication US 2024/0333553 A1, Oct. 3, 2024
Int. Cl. G06F 15/16 (2006.01); H04L 12/40 (2006.01); H04L 12/417 (2006.01)
CPC H04L 12/417 (2013.01) [H04L 12/40019 (2013.01); H04L 12/40065 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A communication device to be mounted in a vehicle to transmit data, comprising:
a transmission unit that is to be connected to a communication bus to which a plurality of second communication devices are to be connected and transmits data,
wherein an order in which the plurality of second communication devices and the transmission unit transmit data through the communication bus is set in advance,
a beacon signal indicating a start of data transmission is repeatedly transmitted through the communication bus,
the transmission unit transmits data according to the order when the beacon signal is transmitted,
the transmission unit transmits dummy data whose transmission destination is different from the plurality of second communication devices when there is no transmission data to be transmitted to the second communication devices, and
a determination unit is provided that determines whether or not to transmit the dummy data based on a data amount of data transmitted through the communication bus, until a data transmission turn comes after the beacon signal is transmitted, when the transmission data is not present.