Wavelength and Bandwidth Allocation in WDM/TDM-PON Networks
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Solution Overview
Problem
In WDM/TDM-PON networks, the existing wavelength and bandwidth allocation methods lead to inefficiencies and inequalities among subscribers, as surplus bandwidth is not effectively distributed to offset deficiencies, resulting in reduced transmission rates and unfair resource allocation.
Innovation Solution
A method that determines guaranteed bandwidths based on subscription service classes, distributes reference bandwidths equally among subscribers with the same class, and reallocates surplus bandwidth from excess to deficient users, ensuring fair and efficient use of bandwidth resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If bandwidth is equally distributed according to subscription service class, then inequality between subscribers is eliminated, but wavelength and bandwidth allocation efficiency is lowered
Solution Approach 1:
The patent implements dynamic bandwidth allocation where the OLT continuously monitors actual bandwidth usage of each ONU and adjusts allocations in real-time. The bandwidth assigned to each ONU is dynamically modified based on the difference between guaranteed bandwidth and actual usage, allowing the system to adapt to changing traffic conditions while maintaining fairness among subscribers of the same service class.
Solution Approach 2:
The patent employs a feedback mechanism where the OLT receives bandwidth usage information from ONUs and uses this feedback to adjust future bandwidth allocations. The system calculates the difference between guaranteed and actual bandwidth usage, then uses this information to modify subsequent allocations, creating a closed-loop control system that improves allocation efficiency while maintaining fairness.
2Quantity of substance
If heavy users are shifted to new wavelengths, then bandwidth for heavy users is increased, but bandwidth allocated to remaining users is unintentionally increased, causing inequality
Solution Approach 1:
The patent changes the parameter of bandwidth allocation from static equal distribution to dynamic adjustment based on actual usage. By modifying the allocation parameters in real-time according to monitored bandwidth consumption, the system can prevent unintentional bandwidth increases for remaining users while ensuring heavy users receive adequate resources, thereby maintaining fairness.
Solution Approach 2:
The patent establishes guaranteed bandwidth allocations in advance for each ONU based on their subscription service class before traffic demands arise. This preliminary allocation ensures that when heavy users need more bandwidth, it is taken from the surplus of other users rather than creating unintentional increases for remaining users, thus preventing inequality.
3Reliability
If guaranteed bandwidth is allocated to each subscriber, then service quality is ensured, but surplus bandwidth cannot be distributed to offset deficiencies
Solution Approach 1:
The patent maintains continuous monitoring and adjustment of bandwidth allocations, ensuring that guaranteed bandwidth is always available while simultaneously capturing and redistributing surplus bandwidth. The system continuously tracks actual usage and immediately reallocates surplus resources to users with deficiencies, maintaining both service quality guarantees and high utilization efficiency.
Solution Approach 2:
The patent recovers surplus bandwidth that would otherwise be discarded by capturing unused bandwidth from users who consume less than their guaranteed allocation and redistributing it to users who need more bandwidth. This recovery mechanism ensures that no bandwidth is wasted while maintaining service quality guarantees for all users.
Data Source
AI summary
A wavelength and bandwidth allocation method which includes in order a wavelength determination step S4 of determining a plurality of wavelengths of an uplink signal from each ONU to OLT to guarantee a guaranteed bandwidth corresponding to a subscription service class of each ONU and a reference bandwidth distribution step S5 of distributing, as reference bandwidths, all bandwidths of the plurality of wavelengths determined in the wavelength determination step S4 to each ONU according to the subscription service class of each ONU and making the reference bandwidths of ONUs whose subscription service classes are the same be the same.