One-Way Delay Measurement Without Time Synchronization
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Solution Overview
Problem
Current one-way delay measurement mechanisms rely on time synchronization, which is not feasible in scenarios like deploying servers in inaccessible locations, limiting their ability to accurately measure one-way delay.
Innovation Solution
A method and apparatus that acquire target time information from intermediate and destination nodes carried by delay measurement packets, allowing for the calculation of accumulative one-way link delay without the need for time synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If time synchronization mechanisms (GPS, 1588 clock protocol) are used to enable one-way delay measurement, then measurement capability is provided, but adaptability to various deployment scenarios deteriorates due to inability to meet synchronization requirements in inaccessible locations
Solution Approach 1:
The patent introduces an intermediary mechanism where round-trip delay measurement packets serve as mediators between source and destination nodes. These packets carry timestamp information that enables one-way delay calculation without requiring direct time synchronization between nodes. The intermediary packet exchanges allow each node to compute relative delays based on locally measurable round-trip times, thus resolving the contradiction between measurement capability and adaptability.
Solution Approach 2:
The patent replaces the mechanical time synchronization system (GPS, 1588 protocols requiring synchronized clocks) with a software-based calculation system. Instead of relying on synchronized time sources, the system uses timestamp recording and mathematical computation of round-trip delays to derive one-way delay values. This substitution eliminates the need for physical time synchronization infrastructure, greatly improving adaptability to inaccessible deployment locations.
2Adaptability or versatility
If round-trip delay measurement is used instead of one-way delay measurement, then time synchronization requirement is relaxed, but measurement accuracy deteriorates due to asymmetry in forward and reverse direction delays
Solution Approach 1:
The patent segments the round-trip delay measurement process into multiple directional components. By recording timestamps at different stages (source transmission time, destination reception time, destination response time, source reception time), the system can separate and analyze forward and reverse direction delays independently. This segmentation allows for more accurate one-way delay derivation while maintaining the adaptability of round-trip measurement approaches.
Data Source
AI summary
A delay measurement method and apparatus, a storage medium and a program product are disclosed. The delay measurement method may include: acquiring target time information carried by a first delay measurement packet, the target time information including first time information filled by an intermediate node on a transmission path and second time information filled by a destination node on the transmission path; acquiring an accumulative one-way link delay from a source node to the destination node according to the first time information and the second time information; and transmitting a second delay measurement packet including the accumulative one-way link delay to the destination node, so that the destination node acquires a one-way delay from the source node to the destination node according to the accumulative one-way link delay.