Optical line terminal of optical network and uplink scheduling method

An optical line terminal for an optical communication system, the optical communication system including:

• one or a plurality of child communication stations;
• parent communication stations, which are configured to perform uplink scheduling for the one or plurality of child communication stations;
• and
• a PON-type optical network, the PON-type optical network including one or a plurality of optical network units, which are interposed between the one or plurality of child communication stations and the parent communication stations and which are connected to the one or plurality of child communication stations, and the optical line terminal, which is configured to transmit to and receive from the one or plurality of optical network units and which is connected to the parent communication stations,
• the optical line terminal comprising:
• a processing circuitry
• to manage, for each of the one or plurality of optical network units, a transmission delay time in transmission to the one or plurality of optical network units;
• to manage, for each of the one or plurality of child communication stations, an acceptable waiting time of uplink data of the one or plurality of child communication stations;
• to obtain from the parent communication stations, for each of the one or plurality of child communication stations, an uplink transmission start time and data amount of the one or plurality of child communication stations;
• and
• to generate, for each of the one or plurality of optical network units, uplink transmission grant information, which is made up of a time point and time length of uplink transmission to the one or plurality of optical network units,
• wherein the processing circuitry calculates, for each of the one or plurality of child communication stations, the uplink transmission start time and data amount of the one or plurality of child communication stations, by obtaining, from the parent communication stations, uplink assignment information related to uplink scheduling, and
• wherein the processing circuitry determines, for each of the one or plurality of optical network units, the uplink transmission grant information on transmission to the one or plurality of optical network units, based on a transmission delay time of the one or plurality of optical network units, on the uplink transmission start time and data amount of each of the one or plurality of child communication stations, and on the acceptable waiting time of uplink data of each of the one or plurality of child communication stations.

An uplink scheduling method for an optical network to be used in an optical line terminal for the optical network, the optical line terminal being configured to transmit to and receive from the one or plurality of optical network units in a PON-type optical network, the uplink scheduling method comprising:

• managing, for each of the one or plurality of optical network units, a transmission delay time in transmission to the one or plurality of optical network units;
• managing, for each of the one or plurality of optical network units, an acceptable waiting time of uplink data of the one or plurality of optical network units;
• obtaining, for each of the one or plurality of optical network units, an uplink transmission start time and data amount of the one or plurality of optical network units, based on uplink assignment information, which is sent from a node different from the optical line terminal and the one or plurality of optical network units;
• and
• generating, for each of the one or plurality of optical network units, uplink transmission grant information, which is made up of a time point and time length of uplink transmission to the one or plurality of optical network units,
• wherein, when the uplink transmission grant information is generated for each of the one or plurality of optical network units, the uplink transmission grant information on transmission to the one or plurality of optical network units is determined based on a transmission delay time of the one or plurality of optical network units, on the uplink transmission start time and data amount of the one or plurality of optical network units, and on the acceptable waiting time of uplink data of the one or plurality of optical network units.