US 12,231,998 B2
Communication system, data transmitting device, communication device, and communication method
Tasuku Nakayama, Kanagawa (JP); and Kengo Takasu, Kanagawa (JP)
Assigned to 3M Innovative Properties Company, St. Paul, MN (US)
Appl. No. 17/783,173
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed Dec. 9, 2020, PCT No. PCT/IB2020/061711
§ 371(c)(1), (2) Date Jun. 7, 2022,
PCT Pub. No. WO2021/116947, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 2019-224594 (JP), filed on Dec. 12, 2019.
Prior Publication US 2022/0417717 A1, Dec. 29, 2022
Int. Cl. H04W 4/42 (2018.01); B61L 3/12 (2006.01); H04L 67/12 (2022.01)
CPC H04W 4/42 (2018.02) [B61L 3/125 (2013.01); H04L 67/12 (2013.01)] 11 Claims
OG exemplary drawing
 
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.