PON DBA Engine for L4S Queue Latency and Bandwidth Guarantees
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Solution Overview
Problem
Existing dynamic bandwidth allocation (DBA) engines in passive optical networks (PON) fail to guarantee low latency and bandwidth requirements of Low Latency, Low Loss, and Scalable Throughput (L4S) services due to dynamic bandwidth and latency assignment mechanisms, which hinder L4S traffic flow.
Innovation Solution
Implementing a L4S traffic descriptor parameter within the DBA engine to identify and manage L4S transmission queues, ensuring recurrent transmission opportunities meet service latency and bandwidth requirements by allocating specific bandwidth and reporting queue occupancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic bandwidth allocation (DBA) is used in PON, then bandwidth utilization and adaptability are improved, but service latency and bandwidth guarantees for L4S services deteriorate
Solution Approach 1:
The invention segments the transmission queue into multiple queues, including a first queue for L4S traffic and a second queue for non-L4S traffic. This segmentation allows the DBA engine to apply different allocation strategies to different traffic types, ensuring L4S traffic receives guaranteed bandwidth and low latency treatment while other traffic can utilize dynamic allocation for improved bandwidth utilization.
Solution Approach 2:
The invention applies local quality by providing differentiated service treatment to different queues. The L4S queue receives prioritized handling with strict bandwidth guarantees and low latency allocation, while the non-L4S queue allows dynamic bandwidth adjustment. This localized quality differentiation resolves the contradiction by ensuring reliability for L4S while maintaining adaptability for other traffic.
2Loss of time
If recurrent transmission opportunities are allocated for L4S traffic, then service latency is reduced, but bandwidth efficiency deteriorates due to dedicated allocation
Solution Approach 1:
The invention applies dynamics by making the bandwidth allocation flexible and adaptive. The DBA engine dynamically adjusts the bandwidth allocated to the L4S queue based on actual network conditions and traffic demands. When L4S traffic requires low latency, recurrent transmission opportunities are allocated; when traffic demand is lower, bandwidth can be dynamically adjusted or reallocated to other queues, thus reducing bandwidth efficiency loss while maintaining latency guarantees when needed.
Solution Approach 2:
The invention changes parameters by adjusting bandwidth allocation, transmission opportunity frequency, and queue priority based on traffic conditions. The DBA engine monitors network state and modifies allocation parameters dynamically, ensuring low latency for L4S traffic when required while optimizing bandwidth utilization by adjusting parameters during periods of lower demand.
3Ease of operation
If L4S traffic descriptor parameter is added to DBA engine, then L4S service identification and management are improved, but device complexity increases
Solution Approach 1:
The invention applies universality by designing the L4S traffic descriptor parameter to serve multiple functions within the DBA engine. The parameter not only identifies L4S traffic but also triggers appropriate queue allocation, bandwidth guarantee enforcement, and latency optimization mechanisms. This multi-functionality reduces the need for separate complex mechanisms while improving L4S service management through a single integrated parameter.
Data Source
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AI summary
Example embodiments describe an optical line terminal, OLT (110), configured to communicate in a passive optical network (101) with optical network units, ONUs (130, 140, 150), that respectively comprise one or more transmission queues (131, 132, 141, 151, 152, 153); wherein the OLT comprises a dynamic bandwidth allocation, DBA, engine (111) configured to allocate recurrent transmission opportunities (133, 142, 143, 144, 154, 155) to the respective transmission queues for transmitting packets (160, 161) from the respective transmission queues to the OLT; wherein at least one ONU (140) comprises a L4S transmission queue (141) for transmitting L4S packets (160) with at most a service latency and at least a service bandwidth; and wherein the DBA engine is further configured to perform, identifying a L4S transmission queue based on a L4S traffic descriptor parameter provisioned within the DBA engine.