PTP Time Error Insertion Unit for O-RAN Measurement
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Solution Overview
Problem
Existing measurement devices that simulate an O-RAN Distributed Unit (O-DU) face challenges in performing PTP time error insertion tests without causing synchronization deviations, especially when rapid errors are inserted.
Innovation Solution
A measurement device is designed with a transmission time error insertion unit and a reception time error insertion unit that gradually increase the error amount to a predetermined offset value, allowing for PTP time error insertion without synchronization deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If PTP time error is rapidly inserted to test offset performance, then error insertion speed is improved, but PTP time synchronization deviates
Solution Approach 1:
The patent applies dynamics by transitioning from static error insertion to dynamic gradual error accumulation. The time error insertion unit incrementally increases the error amount over time rather than applying it abruptly, allowing the system to adapt dynamically while maintaining synchronization reliability throughout the test process.
Solution Approach 2:
The patent implements preliminary action by pre-establishing a gradual error accumulation mechanism before reaching the target offset value. The error is built up step-by-step in advance, ensuring that the PTP synchronization remains stable until the desired error level is achieved, preventing sudden synchronization deviations.
2Measurement precision
If error is inserted at real time instead of PTP time, then measurement accuracy is improved, but test validity is reduced
Solution Approach 1:
The patent introduces an intermediary mechanism - the time error insertion unit - that acts as a mediator between real-time measurement and PTP time requirements. This unit translates real-time measurements into PTP time-aligned error insertions, preserving both measurement accuracy and test validity by ensuring errors are applied at appropriate PTP time moments rather than arbitrary real-time instances.
Data Source
AI summary
There are provided an Ethernet unit that performs transmission and reception of a packet with an O-RU, a time generation unit that generates a base time of a measurement device, a transmission time error insertion unit that inserts an error in a time generated by the time generation unit in a case of inserting a PTP error, and a reception time error insertion unit that inserts an error in a time which is notified by the Ethernet unit in a case of inserting a PTP error, in which the transmission time error insertion unit and the reception time error insertion unit add an error amount while gradually increasing the error amount to an offset value in a case where an offset-attached error addition test is performed, and perform the error addition test in a case where the error amount reaches the offset value.