Dynamic Link Delay Measurement Cycle for Vehicle Network Energy Efficiency
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Solution Overview
Problem
In Ethernet-based vehicle networks, communication nodes frequently measure link delays for time synchronization, leading to unnecessary energy consumption due to excessive transmission of periodic messages.
Innovation Solution
A method where a communication node measures link delays, calculates differences with average values, and adjusts the measurement cycle based on threshold values to optimize transmission cycles, reducing frequent measurements and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If communication nodes periodically transmit messages for measuring link delays according to a predetermined cycle, then time synchronization is maintained, but energy is consumed unnecessarily due to excessive transmission of periodic messages
Solution Approach 1:
The patent applies dynamics by making the link delay measurement cycle adjustable rather than fixed. The measurement cycle is dynamically modified based on the measured link delay values - when link delay is small, the cycle is extended; when link delay is large, the cycle is shortened. This dynamic adjustment resolves the contradiction by adapting the transmission frequency to actual network conditions, reducing unnecessary transmissions while maintaining synchronization reliability.
Solution Approach 2:
The patent changes the parameter of measurement cycle duration based on measured link delay characteristics. By calculating the standard deviation of link delay measurements and comparing it to a threshold, the system adjusts the measurement cycle parameter to optimize between synchronization accuracy and energy consumption, directly addressing the technical contradiction.
2Measurement precision
If communication nodes frequently measure link delays to maintain accurate time synchronization, then synchronization precision is improved, but energy consumption increases due to excessive message transmissions
Solution Approach 1:
The system dynamically adjusts the measurement frequency based on the observed link delay stability. When link delay measurements show low variability (small standard deviation), the measurement cycle is extended, reducing energy consumption. When variability increases, the cycle is shortened to maintain precision. This dynamic approach resolves the contradiction between measurement precision and energy consumption.
Solution Approach 2:
The patent implements feedback by using the measured link delay values and their standard deviation to control future measurement behavior. The system continuously monitors link delay characteristics and adjusts the measurement cycle accordingly, creating a closed-loop control that optimizes the balance between measurement precision and energy consumption based on actual network conditions.
Data Source
AI summary
An operation method of a first communication node among a plurality of communication nodes included in an Ethernet-based vehicle network may include steps of measuring a first link delay for performing time synchronization with a second communication node included in the plurality of communication nodes; calculating a difference between the first link delay and an average value of a plurality of link delays measured before the measurement of the first link delay; comparing the calculated difference with a first threshold value for controlling a link delay measurement cycle for the second communication node; and controlling the link delay measurement cycle for the second communication node based on the comparison result.