Communication device, communication system, and method of communication

A communication system, comprising:

• a plurality of communication devices;
• and
• a base station, wherein
• each communication device includes:
• a transmission unit that transmits a transmission signal including predetermined information to a base station in accordance with a preset transmission order and a preset transmission cycle, and that transmits the transmission order and a specific signal to other communication device when the communication device is in a specific state;
• a receiving unit that receives, from the other communication device, a preset transmission order and a specific signal of in the other communication device;
• and
• a control unit that changes the transmission order and the transmission cycle and controls the transmission unit to transmit the predetermined information to the base station, when the communication device in the specific state or the receiving unit receives the specific signal from the other communication device,
• wherein
• when the communication device is in the specific state, the control unit shortens the transmission cycle and calculates a transmission timing of the predetermined information by advancing the transmission order to a first, and controls the transmission unit to transmit the predetermined information to the base station, and
• when the receiving unit receives the specific signal from the other communication device, the control unit extends the transmission cycle and calculates a transmission timing of the predetermined information by comparing the transmission order with the received transmission order of the other communication device and changing the transmission order, and controls the transmission unit to transmit the predetermined information to the base station.

A method of communication, comprising:

• transmitting a transmission signal including predetermined information to a base station in accordance with a preset transmission order and a preset transmission cycle, and that transmits the transmission order and a specific signal to other communication device when a communication device is in a specific state;
• receiving, from the other communication device, a preset transmission order and a specific signal of the other communication device;
• and
• changing the transmission order and the transmission cycle and calculating a transmission timing of the predetermined information to the base station, when the communication device is in the specific state or the specific signal is received from the other communication device,
• wherein
• the method further includes:
• when the communication device is in the specific state, shortening the transmission cycle and calculating a transmission timing of the predetermined information by advancing the transmission order to a first, and transmitting the predetermined information to the base station;
• and
• when the specific signal is received from the other communication device, extending the transmission cycle and calculating a transmission timing of the predetermined information by comparing the transmission order with the received transmission order of the other communication device, and transmitting the predetermined information to the base station.