Remote Device Time Stamp Unit Measurement via Statistical Averaging
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Solution Overview
Problem
Current methods for measuring a time stamp unit of a remote device require network-wide clock synchronization, leading to inaccurate measurements due to transmission delay errors.
Innovation Solution
A method and apparatus that obtain m sets of sampled data, calculate estimated time stamp units, and select a unit with a difference within a predetermined range from the average, eliminating the need for network-wide clock synchronization by using statistical averaging to cancel transmission delay errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If network-wide clock synchronization is used to measure time stamp unit, then measurement accuracy is improved, but device complexity and operational difficulty increase
Solution Approach 1:
The patent extracts the transmission delay component from the measurement equation and eliminates it through differential calculation. By measuring the time difference between sending and receiving packets and subtracting this from the total round-trip time, the method isolates the remote device's clock unit without requiring synchronization with network clocks.
Solution Approach 2:
The patent introduces packet transmission time as an intermediary measurement. Instead of directly comparing clock timestamps which would require synchronization, the method uses the measurable transmission time of packets as an intermediate variable to indirectly determine the remote device's time stamp unit through calculation.
2Ease of operation
If transmission delay is not compensated, then measurement process is simplified, but measurement accuracy deteriorates
Solution Approach 1:
The patent implements feedback by measuring the actual transmission delay and using this information to correct the time stamp unit calculation. The measured transmission time is fed back into the calculation formula to compensate for its effect, thereby improving accuracy without significantly complicating the measurement process.
Solution Approach 2:
The patent performs preliminary measurement of the transmission delay before calculating the time stamp unit. By measuring the one-way transmission time in advance and storing it as a correction factor, the method prepares the compensation data needed for accurate calculation without adding complexity to the main measurement process.
3Measurement precision
If multiple sampled data sets are collected and processed, then measurement accuracy is improved, but measurement time increases
Solution Approach 1:
The patent applies partial action by collecting a specific number of sample data sets (m sets) that is sufficient to achieve the desired measurement accuracy through statistical averaging, but not excessive. This optimized sampling approach balances accuracy improvement with time efficiency, avoiding unnecessary prolonged measurement periods.
Data Source
AI summary
The method for measuring a time stamp unit of a remote device includes: obtaining m sets of sampled data, m is a positive integer, and m>1; calculating m estimated time stamp units according to the time stamps when packets are transmitted and the time points when the previously transmitted data packets and the subsequently transmitted data packets arrive at the measuring point; selecting, from the m estimated time stamp units, an estimated time stamp unit; and calculating a time stamp unit of the remote device according to the selected estimated time stamp unit.