Multi-quiet zone-based optical network unit registration method for low-latency service

1. A method of registering a new optical network unit (ONU) by an optical line terminal (OLT) in an environment where a wired service and a wireless service are concurrently provided, through a single passive optical network (PON), the method comprising:

transmitting a ranging notification message to a centralized unit (CU)/distributed unit (DU) to register the new ONU;

receiving scheduling information for registering the new ONU from the CU/DU in response to the ranging notification message;

based on the received scheduling information, transmitting a serial number request message to each of service regions in which ONUs are present for the wired service and the wireless service; and

when a serial number response message is received from the new ONU in response to the serial number request message, registering the new ONU that transmits the serial number response message,

wherein the transmitting of the serial number request message is performed through a multi-quiet zone, wherein the multi-quiet zone is configured to include a plurality of quiet zones by dividing a single quiet zone into the plurality of quiet zones having shorter periods to satisfy a low latency required in the wireless service.

2. The method of claim 1 , wherein each quiet zone in the multi-quiet zone comprises a minimum response time variation of an ONU, a random delay time, an optical fiber transmission time, and a distance variation time for adjusting a variation that is based on a distance of the ONU.

3. The method of claim 1 , wherein the CU/DU is configured to provide the scheduling information such that a radio unit (RU) does not transmit data to the OLT in a quiet zone interval in which registration of the new ONU is performed.

4. The method of claim 1 , wherein the serial number request message comprises an identifier (ID) for identifying each of the service regions that are classified based on distances between the OLT and each of the ONUs,

wherein the new ONU present in the service region is configured to transmit the serial number response message to the OLT in response to the serial number request message comprising the ID corresponding to a location of the new ONU.

5. The method of claim 1 , wherein, when the serial number request message is received from the OLT, the new ONU is configured to transmit the serial number response message to the OLT after a minimum response time and, a random delay time.

6. The method of claim 1 , wherein the registering of the new ONU comprises:

allocating, an identifiable ID to the new ONU that transmits the serial number response message; and

completing the registering of the new ONU by measuring a distance to the new ONU to which the ID is allocated and allocating an adjusted value.

7. An optical line terminal (OLT) in an environment where a wired service and a wireless service are concurrently provided through a single passive optical network (PON), comprising:

a processor,

wherein the processor is configured to:

transmit a ranging notification message to a centralized unit (CU)/distributed unit (DU) to register a new optical network unit (ONU);

receive scheduling information for registering the new ONU from the CU/DU in response to the ranging notification message;

based on the scheduling information, transmit a serial number request message to each of service regions in which ONUs are present for the wired service and the wireless service, wherein the transmitting of the serial number request message is performed through a multi-quiet zone, wherein the multi-quiet zone is configured to include a plurality of quiet zones by dividing a single quiet zone into the plurality of quiet zones having shorter periods to satisfy a low latency required in the wireless service; and

when a serial number response message is received from the new ONU in response to the serial number request message, register the new ONU that transmits the serial number response message.

8. The OLT of claim 7 , wherein each quiet zone in the multi-quiet zone comprises a minimum response time variation of an ONU, a random delay time, an optical fiber transmission time, and a distance variation time for adjusting a variation that is based on a distance of the ONU.

9. The OLT of claim 7 , wherein the CU/DU is configured to provide the scheduling information such that a radio unit (RU) does not transmit data to the OLT in a quiet zone interval in which registration of the new ONU is performed.

10. The OLT of claim 7 , wherein the serial number request message comprises an identifier (ID) for identifying each of the service regions that are classified based on distances between the OLT and each of the ONUs,

wherein the new ONU present in the service region is configured to transmit the serial number response message to the OLT in response to the serial number request message comprising the ID corresponding to a location of the new ONU.

11. The OLT of claim 7 , wherein, when the serial number request message is received from the OLT, the new ONU is configured to transmit the serial number response message to the OLT after a minimum response time and a random delay time.

12. The OLT of claim 7 , wherein the processor is configured to:

allocate an identifiable ID to the new ONU that transmits the serial number response message, and complete the registering of the new ONU by measuring a distance to the new ONU to which the ID is allocated and allocating an adjusted value.