Station-side device independent upstream downstream wavelength changeover
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Solution Overview
Problem
Current wavelength tunable WDM/TDM-PON systems face challenges in optimizing upstream and downstream band utilization efficiency independently based on traffic volumes, leading to inefficient bandwidth utilization and load distribution.
Innovation Solution
Implementing a dynamic wavelength and bandwidth allocation system where a station-side device generates separate wavelength changeover instructions for upstream and downstream signals, allowing independent changes in wavelengths to optimize bandwidth usage according to traffic conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If wavelength tunable WDM/TDM-PON systems are used to expand system capacity, then system bandwidth can be increased, but upstream and downstream band utilization efficiency cannot be optimized independently based on traffic volumes
Solution Approach 1:
The patent segments the wavelength allocation control into independent upstream and downstream components. The wavelength change instruction unit can generate and process wavelength changeover instructions separately for upstream wavelengths and downstream wavelengths, allowing independent optimization of band utilization efficiency for each direction based on their respective traffic volumes.
Solution Approach 2:
The patent implements dynamic wavelength allocation where wavelengths are not fixed but can be changed based on real-time traffic conditions. The wavelength change instruction unit dynamically generates wavelength changeover instructions when traffic volumes require optimization, enabling the system to adaptively adjust band utilization efficiency for upstream and downstream independently.
2Device complexity
If fixed wavelength assignment is used in WDM/TDM-PON systems, then system implementation is simplified, but bandwidth utilization efficiency cannot be optimized according to traffic load state
Solution Approach 1:
The patent transitions from fixed wavelength assignment to dynamic wavelength allocation. The wavelength change instruction unit monitors traffic load states and generates wavelength changeover instructions to optimize bandwidth utilization efficiency while maintaining relatively simple system implementation through standardized instruction processing.
Solution Approach 2:
The patent changes the wavelength parameter dynamically based on traffic load conditions. The wavelength change instruction unit adjusts wavelength assignments in response to traffic volume changes, allowing the system to optimize bandwidth utilization efficiency without fundamentally changing the system architecture.
3Ease of operation
If upstream and downstream wavelengths are changed together as a pair, then wavelength routing is simplified, but independent optimization of upstream and downstream band utilization is prevented
Solution Approach 1:
The patent segments the wavelength change instruction into separate upstream and downstream components. The wavelength change instruction unit can generate wavelength changeover instructions for upstream wavelengths independently from downstream wavelengths, allowing independent optimization of band utilization efficiency for each direction while maintaining simplified routing through standardized instruction formats.
Solution Approach 2:
The patent enables dynamic and independent control of upstream and downstream wavelength assignments. The wavelength change instruction unit can respond to traffic conditions in either direction independently, generating wavelength changeover instructions as needed for upstream, downstream, or both, thereby achieving independent optimization while maintaining operational simplicity.
Data Source
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AI summary
In a case where a wavelength to be assigned to a subscriber-side device, to which a downstream wavelength has been assigned, is to be changed from the currently used (Source) downstream wavelength to a different changeover target (Target) downstream wavelength, a downstream wavelength changeover instruction message that indicates the change target wavelength is generated. In a case where a wavelength to be assigned to the subscriber-side device, to which an upstream wavelength has been assigned, is to be changed from the currently used (Source) upstream wavelength to a different changeover target (Target) upstream wavelength, an upstream wavelength changeover instruction message that indicates the change target wavelength is generated. The downstream wavelength changeover instruction message and the upstream wavelength changeover instruction message are respectively independently generated, and only the wavelength for which the wavelength changeover instruction message was generated is changed.