US 12,438,799 B2
One way latency estimation without clock synchronization
Timothy John Dellinger, Frederick, MD (US); and Joel Padullés Pubill, Barcelona (ES)
Assigned to Spirent Communications, Inc., Santa Clara, CA (US)
Filed by Spirent Communications, Inc., San Jose, CA (US)
Filed on Apr. 21, 2023, as Appl. No. 18/137,932.
Claims priority of provisional application 63/334,076, filed on Apr. 22, 2022.
Prior Publication US 2023/0344738 A1, Oct. 26, 2023
Int. Cl. H04L 43/06 (2022.01); H04L 43/106 (2022.01)
CPC H04L 43/106 (2013.01) [H04L 43/06 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for revising latency measurements in a communication network comprising at least two nodes, a near node and a far node, comprising:
sending time stamped data from the near node to the far node, receiving corresponding return time stamped data at the near node from the far node during a defined time interval and time stamping the data received;
determining minimum, maximum, and average values for both far end latency and near end latency from the time stamped data received from the far node over the defined time interval;
calculating a clock offset for the far node relative to the near node using a minimum value for far end latency and a minimum value for near end latency;
determining revised minimum, maximum, and average values for far end latency and near end latency from the previously determined values using the calculated clock offset; and
reporting the revised minimum, maximum, and average values for far end latency and near end latency to a network operator to indicate network performance corresponding to the defined time interval.