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US 11,689,296 B2Granted
On-board communication system, optical coupler, and on-board device
AssigneeSumitomo Electric Industries, Ltd.
InventorsYuto Ueno, Toshihiro Ichimaru, Yuta Miyagawa, Susumu Takeshima
Life of this patent
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Abstract
An on-board communication system includes an optical coupler that includes multiple optical transmission lines, and multiple on-board devices that are capable of communicating with each other with the optical coupler interposed therebetween.
Claims13
An on-board communication system comprising:
- an optical coupler that includes multiple optical transmission lines;
- and
- multiple on-board devices that are capable of communicating with each other with the optical coupler interposed therebetween, wherein
- the multiple on-board devices include at least a master on-board device corresponding to the on-board device that transmits synchronization information for synchronizing transmission timings of the multiple on-board devices,
- each of the multiple on-board devices other than the master on-board device transmits information, based on the synchronization information that is received from the master on-board device to perform time division multiplexing communication,
- the synchronization information defines a communication frame that contains multiple time slots, and
- the master on-board device assigns the multiple time slots to the multiple on-board devices in the synchronization information such that the multiple time slots are switched with a timing with which the multiple on-board devices do not transmit a packet.
4 more elements
An optical coupler that is used for an on-board communication system that includes a first on-board device, a second on-board device, and a third on-board device, the optical coupler comprising:
- a first optical transmission line that connects the first on-board device and the second on-board device to each other;
- and
- a second optical transmission line that connects the first on-board device and the third on-board device to each other, wherein
- the first on-board device is a master on-board device corresponding to the on-board device that transmits synchronization information for synchronizing transmission timings between the second on-board device and between the third on-board device,
- the second on-board device receives the synchronization information from the master on-board device with the first optical transmission line interposed therebetween,
- the third on-board device receives the synchronization information from the master on-board device with the second optical transmission line interposed therebetween,
- the second on-board device and the third on-board device transmit information, based on the synchronization information that is received from the master on-board device to perform time division multiplexing communication,
- the synchronization information defines a communication frame that contains multiple time slots, and
- the master on-board device assigns the multiple time slots to the second on-board device and the third on-board device in the synchronization information such that the multiple time slots are switched with a timing with which the second on-board device and the third on-board device do not transmit a packet.
6 more elements
An on-board device for an on-board communication system that includes an optical coupler that includes multiple optical transmission lines, the on-board device comprising:
- a communication unit that communicates with another on-board device with the optical coupler interposed therebetween;
- and
- a connection unit that is connectable to an optical fiber that is connected to the multiple optical transmission lines, wherein
- the communication unit performs time division multiplexing communication with another on-board device with the connection unit and the multiple optical transmission lines of the optical coupler interposed therebetween, based on synchronization information for synchronizing transmission timings,
- the synchronization information defines a communication frame that contains multiple time slots, and
- the communication frame is assigned the multiple time slots to the on-board device and another on-board device such that the multiple time slots are switched with a timing with which the on-board device and another on-board device do not transmit a packet.
3 more elements
Dependencies are inferred from the claim text.