Optical Uplink Wavelength Scheduling to Prevent Time-Frequency Collisions
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Solution Overview
Problem
In point-to-multi-point optical networks using FDMA and TDMA, leaf nodes face collisions in both frequency and time domains when sending uplink signals to the central node, leading to communication service interruptions and performance degradation.
Innovation Solution
A communication method where a leaf node adjusts its transmit wavelength and sending window based on information received from the central node to avoid collisions, using laser wavelength and timing adjustments to align with the system's frequency and time resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If leaf nodes send uplink signals simultaneously on allocated time-frequency resource blocks, then communication efficiency is improved, but collisions in frequency domain and time domain occur between leaf nodes
Solution Approach 1:
The patent segments the uplink transmission resources by dividing them into multiple time windows and frequency resources. Each leaf node is allocated specific time-frequency resource blocks, and the central node schedules transmissions in segmented time windows to avoid collisions between simultaneous transmissions from multiple leaf nodes.
Solution Approach 2:
The patent implements dynamic wavelength adjustment where leaf nodes dynamically change their transmit wavelength based on feedback information from the central node. The central node detects collisions and sends adjustment instructions to leaf nodes, which then dynamically adjust their laser wavelengths to resolve frequency domain collisions while maintaining efficient communication.
2Device complexity
If leaf nodes use fixed transmit wavelengths, then device complexity is reduced, but frequency domain collisions occur between leaf nodes
Solution Approach 1:
The patent implements a feedback mechanism where the central node detects wavelength collisions by analyzing received signals and sends feedback information to leaf nodes indicating the detected wavelength and collision status. Leaf nodes use this feedback to adjust their transmit wavelengths, creating a closed-loop control system that resolves collisions while maintaining simple fixed-wavelength operation for each individual node.
3Productivity
If the central node allocates time-frequency resource blocks to each leaf node, then frequency domain and time domain resource utilization is improved, but accurate wavelength adjustment and timing synchronization become complex
Solution Approach 1:
The patent implements self-service wavelength adjustment where each leaf node autonomously adjusts its own transmit wavelength based on feedback information from the central node. The leaf node receives wavelength detection results and collision information, then automatically adjusts its laser wavelength without requiring external intervention, simplifying the overall system while achieving precise wavelength control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively prevents collisions and service interruptions, enhancing communication performance by ensuring accurate signal transmission within the allocated frequency and time frames.
Implementation Method 1
a first leaf node sends, in a first uplink sending window, a second uplink signal to a central node via a laser at a first wavelength
Data Source
AI summary
A time-frequency multiple access system includes a central node and a first leaf node. The method provides a first leaf node sends a first uplink signal to the central node. The first leaf node receives first information and second information from the central node. The first information and the second information are determined based on the first uplink signal. The first information indicates a transmit wavelength of a laser of the first leaf node, and the second information indicates a first uplink sending window. The first leaf node sends, in the first uplink sending window, a second uplink signal to the central node via the laser at a first wavelength. The first wavelength is determined based on the first information, and the first uplink sending window is determined based on the second information.