Optical Network Subcarrier Allocation by Link Attenuation
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Solution Overview
Problem
In optical communication networks, link attenuation mismatch with subcarrier frequencies leads to increased network delay and reduced transmission performance due to random subcarrier allocation among optical network units (ONUs).
Innovation Solution
A carrier allocation method that determines link attenuation information for each ONU and allocates subcarriers based on matching attenuation ranges, using frequency-division multiple access (FDMA) and time-division multiple access (TDMA) to optimize subcarrier usage, ensuring frequency matching with link attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If random subcarrier allocation is used among ONUs, then allocation simplicity is maintained, but link attenuation mismatch occurs leading to increased network delay and reduced transmission performance
Solution Approach 1:
The patent changes the allocation parameter from random assignment to attenuation-based assignment. The OLT determines link attenuation for each ONU and allocates subcarriers based on matching attenuation ranges, transforming the allocation criterion from arbitrary to parameter-driven, thereby resolving the contradiction between allocation simplicity and transmission performance
Solution Approach 2:
The patent applies local quality by assigning different subcarrier frequencies to different ONUs based on their specific link attenuation characteristics. Each ONU receives a subcarrier optimized for its local channel conditions, rather than using a uniform random allocation approach, thus improving transmission performance while maintaining manageable allocation complexity
2Productivity
If high-frequency subcarriers are allocated to high-attenuation links, then bandwidth utilization increases, but information loss increases and communication reliability decreases
Solution Approach 1:
The patent establishes an insertion loss relationship that maps link attenuation ranges to appropriate subcarrier frequencies. This parameter change ensures that subcarrier frequency selection is directly correlated with link attenuation characteristics, preventing high-frequency subcarriers from being allocated to high-attenuation links and thus reducing information loss while optimizing bandwidth utilization
Data Source
AI summary
A carrier allocation method in an optical communication network includes allocating, by a carrier allocation device, a subcarrier to the network device based on the link attenuation information when link attenuation information of the network device belongs to a link attenuation range corresponding to a subcarrier, such that a frequency of the subcarrier matches link attenuation of the network device.