Bandwidth Allocation for Low-Latency PON Fronthaul
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Solution Overview
Problem
In passive optical networks (PON) using the TDM scheme, latency is increased due to data queuing time, and existing dynamic bandwidth allocation methods are inefficient for managing multiple optical network units (ONUs), necessitating a method to minimize buffering time and reduce latency for low-latency fronthaul services.
Innovation Solution
A bandwidth allocating method and apparatus that utilize radio scheduling information between CU/DU wireless equipment and the OLT to allocate transmission bandwidth, generating virtual report messages based on actual and expected data arrival times to reduce uplink transmission time, allowing for efficient allocation even with multiple ONUs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic bandwidth allocation (DBA) of status-report scheme is used in PON, then network utilization efficiency is improved, but latency increases due to data queuing time
Solution Approach 1:
The patent applies preliminary action by having the ONU generate and transmit a status report in advance before actual data transmission occurs. The OLT receives this advance notification about upcoming data arrivals and pre-allocates bandwidth accordingly, eliminating the need for data to queue in the ONU buffer and significantly reducing latency while maintaining efficient network utilization
Solution Approach 2:
The patent implements feedback through the status report mechanism where the ONU continuously informs the OLT about its data arrival status and bandwidth requirements. This feedback loop enables the OLT to dynamically adjust bandwidth allocation in real-time, optimizing both network utilization efficiency and latency performance
2Productivity
If OLT manages multiple ONUs simultaneously, then network capacity is improved, but efficient bandwidth allocation becomes more difficult
Solution Approach 1:
The patent applies segmentation by dividing the bandwidth allocation process into discrete, manageable units for each ONU. Each ONU independently generates status reports about its data arrival status, and the OLT processes these reports separately for each ONU. This segmentation allows the OLT to manage multiple ONUs simultaneously in an organized manner, maintaining both network capacity and allocation efficiency
Solution Approach 2:
The patent implements self-service by enabling each ONU to autonomously generate and transmit its own status reports to the OLT. This self-reporting mechanism eliminates the need for the OLT to actively monitor or query each ONU individually, significantly simplifying the bandwidth allocation process while still providing precise control over multiple ONUs
Data Source
AI summary
Provided are an apparatus and a method for allocating a bandwidth for providing a low-latency fronthaul service in a passive optical network. An bandwidth allocating method performed by a bandwidth allocating apparatus included in an OLT includes receiving an actual report message requesting bandwidth allocation from at least one ONU for wired subscribers connected to the OLT, receiving radio scheduling information for at least one ONU for mobile connected to the OLT from a central unit (CU)/digital unit (DU), generating a virtual report message using the radio scheduling information received from the CU/DU, allocating a transmission bandwidth for the at least one ONU for wired subscribers and the at least one ONU for mobile through the received actual report message and the generated virtual report message, and transmitting the allocated transmission bandwidth to the ONU for wired subscribers and the ONU for mobile using a grant message.