Patent ID: 8260855

Claim:
A train communication system having a communication device mounted on each vehicle of a train, the communication device comprising: a cycle information storage section configured to store cycle information indicating that a communication cycle is divided into a first period, a second period and a idle period, the first period enabling communication of only a message to be communicated periodically, the second period enabling communication of a message allowing non-periodic communication, and the idle period enabling communication of only a cycle start message and a message in course of communication; a cycle management section configured to control a start timing of a communication cycle, and to allocate three types of periods to the communication cycle after the start timing by shifting the first period, the second period and the idle period in accordance with the cycle information stored by the cycle information storage section; a queue section configured to store messages received by the communication device; and a message selecting section configured to select a message corresponding to the period allocated by the cycle management section of the communication device from the queue section, and to transmit the selected message.