Wavelength Channel Allocation in Passive Optical Networks
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Solution Overview
Problem
In Passive Optical Networks (PONs), ONUs cannot selectively access specific wavelength channels due to random allocation, leading to resource waste as all channels must be configured with services, rather than just the required ones.
Innovation Solution
An Optical Line Terminal (OLT) acquires and sends pre-set wavelength channel priority information and ONU priority information to enable ONUs to selectively access corresponding wavelength channels based on a pre-set rule, allowing for switching to alternative channels when conditions are met, ensuring high-priority channels are used by high-priority ONUs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If random wavelength channel allocation is used, then any ONU can access any wavelength channel, but specific services cannot be configured for specific ONUs on specific wavelength channels, causing resource waste
Solution Approach 1:
The system pre-configures priority information for both wavelength channels and ONUs before service delivery. The OLT assigns priority levels to wavelength channels and corresponding ONUs in advance, enabling selective access control. This preliminary configuration allows the system to direct high-priority ONUs to specific high-priority wavelength channels, avoiding the need to configure services on all wavelength channels and thus reducing resource waste.
Solution Approach 2:
The patent implements differentiated service quality across different wavelength channels by assigning local priority attributes to each channel and ONU pair. Instead of uniform random allocation, each wavelength channel can be optimized for specific high-priority ONUs, creating localized service quality improvements. This allows specific services to be configured only where needed (on high-priority channels for high-priority ONUs) rather than universally across all channels.
2Adaptability or versatility
If wavelength channel priority information and ONU priority information are sent to each ONU, then ONUs can selectively access corresponding wavelength channels, but system complexity increases
Solution Approach 1:
The system manages complexity by changing the parameter representation from complex service configuration rules to simple priority level parameters. Each wavelength channel and ONU is assigned a priority parameter (e.g., high/low or numerical values), and access decisions are made based on comparing these parameters. This parameter simplification reduces the complexity of priority information management while maintaining selective access capability.
3Reliability
If switching between wavelength channels is implemented, then high-priority ONUs can access high-priority channels, but switching conditions and alternative channel selection add system complexity
Solution Approach 1:
The system performs preliminary identification and preparation of alternative wavelength channels before switching is needed. When an ONU needs to switch to a high-priority channel, the OLT has already identified suitable alternative channels in advance, reducing the complexity of real-time switching decisions. This pre-preparation mechanism ensures reliable service delivery while minimizing the complexity of the switching control mechanism.
Data Source
AI summary
Provided are a method and system for allocating wavelength channels in a Passive Optical Network (PON), and an Optical Line Terminal (OLT). In the method, an OLT may acquire pre-set wavelength channel priority information and Optical Network Unit (ONU) priority information; and the wavelength channel priority information and the ONU priority information may be sent to each ONU to enable each ONU to selectively access a corresponding wavelength channel according to the wavelength channel priority information and the ONU priority information based on a pre-set rule.