Buffered Measurement Data Transmission for Flexible Sampling Periods
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Solution Overview
Problem
Existing measurement systems face limitations in setting measurement periods and transmission periods, as they require the number of sampling periods to be a divisor of the polling periods, leading to incomplete data transmission and reduced flexibility.
Innovation Solution
A measurement system where a measurement device transmits measurement values and additional information, including the number of values, using frames in a period longer than the measurement period, allowing the control device to generate time series data and manage measurement values effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the measurement period is set to be a divisor of the polling period to ensure constant number of measurement values transmitted, then the data transmission reliability is improved, but the flexibility in setting measurement and transmission periods is reduced
Solution Approach 1:
The measurement device stores measurement values in a buffer before transmission, preparing them in advance for the polling period. This preliminary storage action allows the device to accumulate multiple measurement values and transmit them together, ensuring complete data transmission while allowing flexible setting of measurement and polling periods without requiring one to be a divisor of the other.
2Use of energy by moving object
If the polling period is set longer than the sampling period to reduce transmission frequency, then the energy consumption is reduced, but the measurement values cannot be completely transmitted to the control device
Solution Approach 1:
The measurement device performs preliminary storage of measurement values in a buffer during the measurement period, which is shorter than the polling period. This allows the device to accumulate complete sets of measurement data before transmission, ensuring all values are transmitted even though the polling period is longer and occurs less frequently, thereby reducing energy consumption while preventing data loss.
Solution Approach 2:
The transmission process is segmented into two distinct phases: a measurement phase where data is collected and stored in a buffer, and a transmission phase where the accumulated data is sent to the control device. This segmentation allows the measurement period to be optimized for data collection while the longer polling period optimizes for energy-efficient transmission, with the buffer serving as the intermediary that ensures complete data transfer.
3Measurement precision
If the measurement period and transmission period are set with different lengths to increase measurement resolution, then the measurement precision is improved, but the system complexity for managing different periods increases
Solution Approach 1:
The system is segmented into independent measurement and transmission functions with different time periods. The measurement device operates on the shorter measurement period to achieve high-resolution data collection, while the transmission occurs on the longer polling period. The buffer structure segments the data flow, automatically managing the different periods without requiring complex coordination logic, thus maintaining low system complexity while achieving high measurement precision.
Data Source
AI summary
A measurement system and method, which increases a degree of freedom for setting a measurement period and a transmission period of measurement values and has a high accuracy, are provided. The measurement system includes a control device and a measurement device that measures a measurement object in a first period and transmits measurement values obtained from the measurement device to the control device. The measurement device transmits the measurement values waiting to be transmitted and additional information including information of the number of the measurement values waiting to be transmitted to the control device using frames transmitted in a second period that is longer than the first period. The control device generates time series data in which the measurement values are arranged in time series using the additional information.