Hierarchical DBA for PON SLA Compliance
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Solution Overview
Problem
In converged optical networks, residential and business traffic sharing the same communication medium often leads to congestion, causing violations of service level agreements (SLAs) due to the inability to effectively manage and prioritize bandwidth allocation between different traffic classes.
Innovation Solution
Implementing a hierarchical dynamic bandwidth allocation (DBA) system that groups residential and business traffic separately, allowing independent scheduling within each group and prioritizing business services during congestion to ensure compliance with SLAs, while enabling oversubscription of residential services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If residential and business traffic share the same communication medium without separate scheduling, then network simplicity is maintained, but SLA performance for business services deteriorates during congestion
Solution Approach 1:
The patent segments the shared communication medium into separate scheduling instances for residential and business traffic. The DBA server creates distinct scheduling cycles where business traffic receives dedicated bandwidth allocation and priority treatment, while residential traffic shares remaining capacity. This segmentation allows SLA-compliant performance for business services without requiring complete network isolation.
Solution Approach 2:
The system implements dynamic bandwidth allocation where the DBA server continuously adjusts bandwidth parameters based on real-time traffic conditions and SLA requirements. During congestion events, the system dynamically reallocates bandwidth to prioritize business traffic, ensuring SLA compliance while maintaining overall network efficiency through adaptive scheduling.
2Reliability
If business traffic is prioritized over residential traffic during congestion, then SLA performance for business services is maintained, but residential service quality deteriorates
Solution Approach 1:
The patent applies local quality by providing differentiated service characteristics to different traffic types within the same network infrastructure. Business traffic receives localized priority treatment with guaranteed bandwidth and low latency, while residential traffic receives best-effort service. This localized differentiation ensures SLA compliance for business without completely blocking residential access.
Solution Approach 2:
The system implements partial prioritization where business traffic receives enhanced scheduling attention and bandwidth allocation during congestion events, while residential traffic retains partial access to remaining network capacity. This partial action approach ensures critical business SLA requirements are met while maintaining some level of residential service availability.
3Reliability
If separate scheduling for residential and business traffic is implemented, then SLA performance is ensured, but scheduling complexity increases
Solution Approach 1:
The patent introduces a DBA (Dynamic Bandwidth Allocation) server as an intermediary component that manages the complexity of separate scheduling for residential and business traffic. This centralized intermediary handles the scheduling computations, bandwidth calculations, and coordination between different traffic types, reducing the complexity burden on individual network elements while ensuring SLA compliance.
Solution Approach 2:
The DBA server implements a universal scheduling framework that handles both residential and business traffic through a single integrated system. This multi-functional approach allows the same scheduling infrastructure to serve different service classes with different SLA requirements, reducing overall system complexity compared to separate independent scheduling systems.
4Productivity
If bandwidth is allocated to accommodate peak residential traffic demand, then residential service quality is maintained, but business service SLA performance deteriorates during peak periods
Solution Approach 1:
The patent implements preliminary action by pre-allocating guaranteed bandwidth reserves for business traffic based on SLA requirements before congestion occurs. The DBA server calculates and reserves minimum bandwidth levels for business services, ensuring that during peak residential demand periods, business SLA requirements are already secured and cannot be violated by transient residential traffic spikes.
Data Source
AI summary
A passive optical network (PON) has an optical line termination (OLT) that terminates an optical fiber servicing a plurality of optical network units (ONUs). Each ONU has one or more traffic containers (TCONTs) addressable by the OLT. The PON dynamic bandwidth allocation (DBA) implements a scheduling hierarchy, including several scheduling layers, such that disjoint sets of TCONTs can be grouped together, then disjoint sets of groups can be grouped, and so on. In such hierarchy, the residential traffic can be grouped separately from the business traffic. Further, within either the residential or business group, traffic may be grouped to define scheduling layers (“sub-groups”) within the residential or business group. Scheduling in one group or sub-group is performed independently of the scheduling in other groups or sub-groups, subject to the available bandwidth for each group. The scheduling may be controlled to allow the residential services to be oversubscribed while still ensuring compliance of service level performance metrics for the business services.