Communication system, data transmitting device, communication device, and communication method
The invention seeks to provide a communication system, a data transmitting device, a communication device, and a communication method capable of exchanging a sufficient capacity of data in a simple configuration without reducing the speed of a vehicle. The invention provides a communication system for transmitting data by a data transmitting device provided on a route of a moving body to the moving body having a plurality of vehicles in one formation; each of the plurality of vehicles being provided with a receiving unit that receives data transmitted from the data transmitting device; and the data transmitting device being configured to transmit mutually different data to the receiving units of the plurality of vehicles. The moving body may be a train such as the Shinkansen, or a transport vehicle such as a truck to which a plurality of cargo vehicles are connected.
1. A communication system for transmitting data by a data transmitting device provided on a route of a moving body to the moving body, the moving body having a plurality of vehicles in one formation,
each of the plurality of vehicles being provided with a receiving unit that receives data transmitted from the data transmitting device, and
the data transmitting device being configured to:
determine that each respective vehicle of the plurality of vehicles is positioned within a predetermined communication area;
based on the determination that each respective vehicle of the plurality of vehicles is positioned within the predetermined communication area, transmit mutually different data to each of the receiving units of the plurality of vehicles;
receive an “Ack” message from a first vehicle of the plurality;
based on the received “Ack” message, determine that respective first data was successfully transmitted to the first vehicle of the plurality;
receive a “No Ack” message from a second vehicle of the plurality;
based on the received “No Ack” message, determine that respective second data failed to be delivered to the second vehicle of the plurality; and
based on the determination that the respective second data failed to be delivered to the second vehicle of the plurality, retransmit the respective second data to the second vehicle of the plurality.
2. The communication system according to claim 1 , wherein the data transmitting device divides all data to be transmitted into a plurality of data groups and transmits each of the data groups to the receiving units of mutually different vehicles of the plurality.
3. The communication system according to claim 1 , wherein the data transmitting device is further configured to:
acquire a number of the vehicles provided with the receiving units of the moving body; and
adjust a data transmission mode to each of the receiving units of the plurality of vehicles according to the acquired number of vehicles.
4. The communication system according to claim 1 , wherein the data transmitting device is further configured to:
acquire a distance between the respective receiving units of the moving body; and
adjust a data transmission mode to each of the receiving units of the plurality of vehicles according to the acquired distance.
5. The communication system according to claim 1 , wherein the data transmitting device is further configured to:
acquire a speed of the moving body; and
adjust a data transmission mode to each of the receiving units of the plurality of vehicles, according to the acquired speed.
6. The communication system according to claim 1 , wherein the data transmitting device is further configured to adjust a data transmission mode to each of the receiving units of the plurality of vehicles, according to a total amount of all data to be transmitted.
7. The communication system according to claim 1 , wherein the data transmitted by the data transmitting device includes information indicative of at least one of: temperature, current, voltage, vibration, or partial discharge of a cable provided on the route.
8. The communication system according to claim 1 , wherein the “Ack” message is a first “Ack” message, and wherein the data transmitting device is further configured to repeat the retransmission of the respective second data to the second vehicle until receipt of a second “Ack” message from the second vehicle with respect to the retransmitted respective second data.
9. A data transmitting device provided on a route of a moving body having a plurality of vehicles in one formation, the data transmitting device transmitting data to the moving body having a plurality of vehicles in one formation, the data transmitting device being configured to:
determine that each respective vehicle of the plurality of vehicles is positioned within a predetermined communication area;
transmit mutually different data to each respective receiving unit of a plurality of receiving units provided in the plurality of vehicles of the moving body based on the determination that each respective vehicle of the plurality of vehicles is positioned within a predetermined communication area;
receive an “Ack” message from a first vehicle of the plurality;
based on the received “Ack” message, determine that respective first data was successfully transmitted to the first vehicle of the plurality;
receive a “No Ack” message from a second vehicle of the plurality;
based on the received “No Ack” message, determine that respective second data failed to be delivered to the second vehicle of the plurality; and
based on the determination that the respective second data failed to be delivered to the second vehicle of the plurality, retransmit the respective second data to the second vehicle of the plurality.
10. A communication method for transmitting data by a data transmitting device provided on a route of a moving body to the moving body having a plurality of vehicles in one formation, the communication method comprising:
receiving information from the moving body in which a receiving unit for receiving the data transmitted from the data transmitting device is provided in each of the plurality of vehicles;
determining that each respective vehicle of the plurality of vehicles is positioned within a predetermined communication area;
in response to determining that each respective vehicle of the plurality of vehicles is positioned within the predetermined communication area, transmitting mutually different data to each of the receiving units of the plurality of vehicles based on the received information;
receiving an “Ack” message from a first vehicle of the plurality;
based on the received “Ack” message, determining that respective first data was successfully transmitted to the first vehicle of the plurality;
receiving a “No Ack” message from a second vehicle of the plurality;
based on the received “No Ack” message, determining that respective second data failed to be delivered to the second vehicle of the plurality; and
based on the determination that the respective second data failed to be delivered to the second vehicle of the plurality, retransmitting the respective second data to the second vehicle of the plurality.
11. The communication method according to claim 10 , wherein the “Ack” message is a first “Ack” message, the communication method further comprising repeating the retransmission of the respective second data to the second vehicle until receiving a second “Ack” message from the second vehicle with respect to the retransmitted respective second data.