Round-Trip Packet Loss Measurement in Packet-Switched Networks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for measuring packet loss in packet-switched communication networks fail to accurately account for different packet rates in counter-propagating directions, leading to inaccurate round-trip packet loss measurements.
Innovation Solution
A method where nodes exchange packets with a packet loss field that can be set to either an idle value or a measurement value, allowing a single measurement point to count packets and calculate round-trip packet loss by reflecting packets, ensuring measurements are based on the same number of packets in both directions, regardless of differing packet rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional packet loss measurement methods are used in packet-switched networks, then packet loss can be measured in one direction, but the measurement does not accurately reflect round-trip packet loss when packet rates differ between counter-propagating directions
Solution Approach 1:
The patent combines measurements from both counter-propagating packet flows into a single round-trip packet loss measurement. By merging the packet loss data from forward and reverse directions and normalizing by the total packet count, the method creates a unified metric that accurately represents overall packet loss while accounting for different packet rates in each direction.
Solution Approach 2:
The patent changes the measurement parameter from one-directional packet loss to round-trip packet loss by modifying how the measurement is calculated. Instead of measuring only one direction, the system measures both directions and combines them using a normalized formula that weights each direction's packet loss by its proportion of total packets, thereby adapting the measurement to reflect actual round-trip conditions.
2Measurement precision
If separate measurements are taken for each direction independently, then directional packet loss can be tracked, but the overall round-trip packet loss measurement becomes inaccurate when packet rates are asymmetric
Solution Approach 1:
The patent creates a universal measurement approach that handles both symmetric and asymmetric packet rate scenarios through a single normalized calculation method. The same measurement system and formula work regardless of whether packet rates are equal or different in each direction, eliminating the need for separate complex measurement systems for different conditions.
3Measurement precision
If packet loss measurement accounts for different packet rates in counter-propagating directions, then measurement accuracy improves, but the measurement methodology becomes more complex
Solution Approach 1:
The patent simplifies the complex measurement problem by changing the approach from tracking separate directional metrics to a unified normalized parameter. By expressing packet loss as a ratio of lost packets to total packets across both directions, the system accounts for asymmetric packet rates through a single straightforward calculation rather than complex multi-parameter tracking.
Data Source
AI summary
A method for enabling a round-trip packet loss measurement between two nodes of a packet-switched communication network exchanging packets comprising a packet loss field settable to an idle value or one or more measurement values. The first node transmits to the second node first packets having the packet loss field set to a measurement value. Upon reception of each first packet, the second node transmits back to the first node a respective second packet having the packet loss field set to a measurement value. Upon reception of each second packet, the first node transmits back to the second node a respective third packet having the packet loss field set to a measurement value. A measurement point placed between the two nodes may count the number of first packets and the number of third packets and use them to provide a round-trip packet loss measurement.