Method, a computer program product, and a carrier for indicating one-way latency in a data network

摘要

Disclosed herein is a method, a computer program product, and a carrier for indicating one-way latency in a data network (N) between a first node (A) and a second node (B), wherein the data network (N) lacks continuous clock synchronization, comprising: a pre-synchronisation step, a measuring step, a post-synchronisation step, an interpolation step, and generating a latency profile. The present invention also relates to a computer program product incorporating the method, a carrier comprising the computer program product, and a method for indicating server functionality based on the first aspect.

主权项

1. A method for determining one-way latency between a first computer node (A) having a first clock and a second computer node (B) having a second clock, comprising:
pre-synchronizing said first clock of said first computer node (A) with said second clock of said second computer node (B), said pre-synchronizing further comprising obtaining a first clock difference value and a first absolute clock value; measuring a sending time and a receiving time associated with each measurement message within a plurality of measurement messages; post-synchronizing said first clock of said first computer node (A) with said second clock of said second computer node (B), said post-synchronizing further comprising obtaining a second clock difference value and a second absolute clock value; interpolating, comprising adjusting the sending time associated with each measurement message, said adjusting based on the sending time, the said first and second clock difference values, and the said first and second absolute clock values, further wherein said adjusting comprises calculating a ratebias,
said calculating of ratebias comprising calculating a numberator=(CDIFF1−CDIFF0) whereinCDIFF1 is the second clock difference value, andCDIFF0 is the first clock difference value, calculating the one-way latency associated with a measurement message in the data network between said first computer node (A) and said second computer node (B) as the difference between the receiving time associated with the measurement message, and the adjusted sending time associated with the measurement message; and generating a latency profile.