Abstract: An acquisition unit acquires pieces of information including information related to a vehicle, information related to the environment inside and outside the vehicle, and information related to a driver on board the vehicle. A determination unit determines priorities of the pieces of information acquired by the acquisition unit on the basis of a service or the like used by the driver among services or the likes provided using information accumulated in a server device. A selection unit selects a piece of information to be transmitted to the server device from among the pieces of information acquired by the acquisition unit on the basis of the priorities determined by the determination unit. A communication unit transmits the piece of information selected by the selection unit to the server device.

Abstract: In order to prevent occurrence of the significantly frequent transmission of messages, a user terminal is configured such that, when a reception power of a target cell is equal to or greater than a first threshold value ThLOW, the user terminal starts preparation for a handover to the target cell, and when the reception power is equal to or greater than a second threshold value ThHIGH, the user terminal performs the handover to the target cell, and that, until a waiting time has elapsed after performing the handover, the user terminal, by using a timer, performs a timing control for maintaining an immediate handover state in which the user terminal can immediately perform a handover, and, when the waiting time has elapsed, the user terminal ends the immediate handover state.

Abstract: In order to prevent occurrence of the significantly frequent transmission of messages, a user terminal is configured such that, when a reception power of a target cell is equal to or greater than a first threshold value ThLOW, the user terminal starts preparation for a handover to the target cell, and when the reception power is equal to or greater than a second threshold value ThHIGH, the user terminal performs the handover to the target cell, and that, until a waiting time has elapsed after performing the handover, the user terminal, by using a timer, performs a timing control for maintaining an immediate handover state in which the user terminal can immediately perform a handover, and, when the waiting time has elapsed, the user terminal ends the immediate handover state.