System for establishing and maintaining a clock reference indicating one-way latency in a data network

摘要

A method for indicating one-way latency in a data network, with continuous clock synchronization, between first and second node having clocks that are not synchronized with each other includes a continuous synchronisation session and a measurement session. The method repetitively sends predetermined synchronization messages from the first node to the second node and from the second node to the first node, calculates a round trip time for each message at the first node, updates a synchronization point if the calculated round trip time is smaller than a previously calculated round trip time, stores the updated synchronization points of a synchronization window, and calculates a virtual clock from the updated synchronization points of the synchronization window. The measurement session collects multiple measurements of one-way latency between the first and second nodes using the virtual clock, and generates a latency profile by interpolating the multiple measurements.

主权项

1. A method for indicating one-way latency in a data network, with continuous clock synchronization, between first and second nodes having clocks that are not synchronized with each other, comprising:
executing a continuous synchronisation session by repetitively
sending predetermined synchronization messages from the first node to the second node and from the second node to the first node,calculating a round trip time for each message at the first node,updating a synchronization point if the calculated round trip time is smaller than a previously calculated round trip time,storing the updated synchronization points of a synchronization window, andcalculating a virtual clock from the updated synchronization points of said synchronization window, and executing a measurement session to determine the one-way latency of said network between said first node and said second node by
collecting multiple measurements of one-way latency between said first and second nodes using the virtual clock, andgenerating a latency profile by interpolating said multiple measurements.