On-board wireless device

An on-board wireless device to be installed in a train, the on-board wireless device comprising:

• a first transceiver that is a transceiver capable of transmitting and receiving data to and from a base station by a wireless communication scheme of a 5th generation mobile communication system using an antenna having directivity in a traveling direction of the train;
• a second transceiver that is a transceiver capable of transmitting and receiving data to and from an on-board wireless device installed in an other train using wireless communication by sidelink;
• a determination circuitry to determine a transceiver to be used for transmission and reception of data based on a communication environment of the train at a position of the train;
• and
• a communication controller to control transmission and reception of data in the first transceiver and the second transceiver based on a determination result of the determination circuitry, wherein
• the determination circuitry uses, as information indicating the communication environment of the train, information on a past measurement result of communication quality of wireless communication of the first transceiver for each point of a line on which the train travels, current position information of the train, and information on a measurement result of communication quality of wireless communication of the first transceiver at a current position of the train, and in response to estimating that the other train that shields wireless communication of the first transceiver exists, determines that data is transmitted and received also by the second transceiver together with the first transceiver, and
• the communication controller performs control such that data is transmitted and received by the first transceiver and the second transceiver based on the determination result.