Communication control device, communication method, communication system and communication program

A communication apparatus comprising:

• a communication unit configured to be connected to an optical ring network and transmit or receive an optical signal via the optical ring network;
• and
• a control unit configured to control transmission timing of an optical signal, wherein
• when the communication apparatus itself is a master communication apparatus, the control unit transmits an optical signal at transmission timing determined in the communication apparatus itself and transmits, from the communication unit to the optical ring network, an assignment signal for assigning transmission timing at which an optical signal on at least one wavelength is time-division multiplexed and transmitted, to other communication apparatuses serving as slave communication apparatuses connected to the optical ring network,
• when the communication apparatus itself is one of the slave communication apparatuses, the control unit transmits an optical signal from the communication unit to the optical ring network, based on the transmission timing assigned by the assignment signal from the master communication apparatus,
• when the communication apparatus itself is the master communication apparatus, the control unit provides a quiet window corresponding to transmission delay time of a length of at least one round of the optical ring network and transmits, from the communication unit to the optical ring network, a search signal for searching for another slave communication apparatus that is unregistered, and when the communication unit receives a registration request signal from the another slave communication apparatus via the optical ring network, the control unit performs processing for registering the another slave communication apparatus, and
• when the communication apparatus itself is one of the slave communication apparatuses, the control unit transmits, from the communication unit to the optical ring network, the registration request signal for requesting registration with the optical ring network, based on the search signal from the master communication apparatus.

A communication system in which a plurality of communication apparatuses is connected by an optical ring network, the communication system comprising:

• a master communication apparatus as one of the plurality of communication apparatuses;
• and
• other communication apparatuses of the plurality of communication apparatuses as slave communication apparatuses, wherein
• the master communication apparatus transmits an optical signal at transmission timing determined in the master communication apparatus and transmits an assignment signal for assigning, to the slave communication apparatuses, transmission timing at which an optical signal on at least one wavelength is time-division multiplexed and transmitted, and,
• one of the slave communication apparatuses transmits an optical signal to the optical ring network, based on the transmission timing assigned by the assignment signal from the master communication apparatus,
• the master communication apparatus provides a quiet window corresponding to transmission delay time for a length of at least one round of the optical ring network and transmits a search signal for searching for another slave communication apparatus that is unregistered,
• when receiving a registration request signal from the another slave communication apparatus, the master communication apparatus performs processing for registering the another slave communication apparatus, and
• when receiving the search signal from the master communication apparatus, the another slave communication apparatus transmits the registration request signal for requesting registration to the master communication apparatus.