Flexible Ethernet Latency Measurement Without GPS Synchronization
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Solution Overview
Problem
Current methods for measuring asymmetric uplink and downlink latency in flexible Ethernet networks rely on GPS synchronization, which is costly and prone to maintenance issues due to high invalidity rates of GPS antennas, especially over long distances.
Innovation Solution
A method and device for measuring asymmetric uplink and downlink latency in flexible Ethernet networks that determines latency differences without relying on GPS synchronization by calculating durations based on time intervals between sending and receiving reference code blocks across nodes, allowing for compensation to achieve latency symmetry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS synchronization is used to measure asymmetric uplink and downlink latency, then measurement precision is improved, but device complexity and maintenance cost increase
Solution Approach 1:
The patent extracts the latency measurement function from the GPS synchronization system. Instead of relying on GPS for time synchronization, the invention uses local time stamps at sending and receiving ends combined with round-trip time calculation to determine latency, thereby eliminating the need for complex GPS synchronization infrastructure.
Solution Approach 2:
The patent introduces an intermediary measurement mechanism using reference code blocks and time stamp exchange. The sending end attaches a time stamp when sending the service code block, the receiving end attaches a time stamp when receiving it, and they exchange these time stamps to calculate latency through mathematical computation, serving as an intermediary method that replaces GPS synchronization.
2Measurement precision
If GPS synchronization is used to measure asymmetric uplink and downlink latency, then measurement precision is improved, but maintenance cost increases
Solution Approach 1:
The patent replaces expensive GPS synchronization hardware with a software-based time stamping mechanism. Instead of maintaining costly GPS antennas and synchronization equipment, the system uses simple time stamp attachments and exchanges, dramatically reducing maintenance costs while achieving the same measurement precision.
3Measurement precision
If GPS synchronization is used to measure asymmetric uplink and downlink latency, then measurement precision is improved, but reliability decreases due to antenna invalidity
Solution Approach 1:
The patent extracts the measurement function from the unreliable GPS system. By using local time stamps and round-trip time calculation, the invention eliminates dependence on external GPS signals, thereby improving reliability while maintaining measurement precision.
4Productivity
If asymmetric latency compensation is implemented, then service quality is improved, but device complexity increases
Solution Approach 1:
The patent performs preliminary latency measurement and compensation parameter calculation before actual service transmission. By measuring asymmetric latency in advance and pre-calculating compensation values, the system can implement latency compensation without adding complexity to the main service flow, thereby improving service quality while maintaining simplicity.
Data Source
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AI summary
Embodiments of the present invention provide a flexible Ethernet latency measurement method and a related device. The method includes: determining, by a first node, first duration based on a first downlink transmission time interval and a second downlink receiving time interval, where the first downlink transmission time interval is a time interval between a time point at which the first node obtains a first service code block and a time point at which the first node sends a first downlink sending reference code block, and the second downlink receiving time interval is a time interval between a time point at which a second node obtains the first service code block and a time point at which the second node obtains a first downlink receiving reference code block; determining, by the first node, second duration based on a first uplink transmission time interval and a second uplink receiving time interval; and calculating, by the first node, an uplink and downlink latency difference between the first node and the second node based on the first duration and the second duration. According to the embodiments of the present invention, costs for measuring an asymmetric uplink and downlink latency can be reduced.