Abstract: A transmission system includes: a hub to receive a control command from two or more controllers that control operation of an in-vehicle machinery installed in a train, and to control an output of the control command on the basis of a priority assigned to the control command, and a system-controller to determine an operating state of a controller that is a source of the control command, the system-controller being capable of changing a priority assigned to a control command transmitted from a controller whose operating state has been determined, on the basis of a determination result.

Abstract: A communication apparatus is mounted on a train and forms a train communication system together with a system control apparatus that generates control frames including general and low-latency frames. The communication apparatus includes: a general transfer processing unit that stores the general frame; a low latency transfer processing unit that stores the low-latency frame, the low latency frame requiring transferring with lower latency than the general frame; a frame identification unit that identifies priority of the control frame and outputs the control frame to the general transfer processing unit or the low latency transfer processing unit based on a priority setting table indicating the priority of the control frame and set in the identification unit; an output control unit that preferentially transfers the low-latency frame over the general frame; and a control unit that modifies the priority setting table.

Abstract: A communication apparatus is mounted on a train and forms a train communication system together with a system control apparatus that generates control frames including general and low-latency frames. The communication apparatus includes: a general transfer processing unit that stores the general frame; a low latency transfer processing unit that stores the low-latency frame, the low latency frame requiring transferring with lower latency than the general frame; a frame identification unit that identifies priority of the control frame and outputs the control frame to the general transfer processing unit or the low latency transfer processing unit based on a priority setting table indicating the priority of the control frame and set in the identification unit; an output control unit that preferentially transfers the low-latency frame over the general frame; and a control unit that modifies the priority setting table.

Abstract: A transmission system includes: a hub to receive a control command from two or more controllers that control operation of an in-vehicle machinery installed in a train, and to control an output of the control command on the basis of a priority assigned to the control command, and a system-controller to determine an operating state of a controller that is a source of the control command, the system-controller being capable of changing a priority assigned to a control command transmitted from a controller whose operating state has been determined, on the basis of a determination result.