Bandwidth allocating apparatus and method for providing low-latency fronthaul service in passive optical network

A bandwidth allocating apparatus included in an optical line terminal (OLT), the bandwidth allocating apparatus comprising:

• a processor,
• wherein the processor is configured to:
• receive an actual report message requesting bandwidth allocation from at least one optical network unit (ONU) for wired subscribers connected to the OLT;
• receive radio scheduling information for at least one ONU for mobile connected to the OLT from a central unit (CU)/digital unit (DU));
• generate a virtual report message using the radio scheduling information received from the CU/DU;
• allocate a transmission bandwidth for the at least one ONU for the wired subscribers and the at least one ONU for the mobile through the received actual report message and the generated virtual report message;
• and
• transmit the allocated transmission bandwidth to the at least one ONU for the wired subscribers and the at least one ONU for the mobile using a grant message,
• wherein the processor is configured to generate the virtual report message in a report update operation of a current cycle when T_ready representing a time available for transmission to the OLT after a packet corresponding to a symbol group arrives at the ONU is less than or equal to T_min representing a shortest time until a packet is outputted as the radio scheduling information is received and the grant message is received to the ONU.

A bandwidth allocating apparatus included in an optical line terminal (OLT), the bandwidth allocating apparatus comprising:

• a processor,
• wherein the processor is configured to:
• receive an actual report message requesting bandwidth allocation from at least one optical network unit (ONU) for wired subscribers connected to the OLT;
• receive radio scheduling information for at least one ONU for mobile connected to the OLT from a central unit (CU)/digital unit (DU));
• generate a virtual report message using the radio scheduling information received from the CU/DU;
• allocate a transmission bandwidth for the at least one ONU for the wired subscribers and the at least one ONU for the mobile through the received actual report message and the generated virtual report message;
• and
• transmit the allocated transmission bandwidth to the at least one OW for the wired subscribers and the at least one ONU for the mobile using a grant message,
• wherein the processor is configured to determine whether to generate a virtual report message after re-calculating T_ref in a next cycle, when (i) T_ready representing a time available for transmission to the OLT after a packet corresponding to a symbol group arrives at the ONU is greater than (ii) T_min representing a shortest time until a packet is outputted as the radio scheduling information is received and the grant message is received to the ONU.