US 9,813,175 B2
Method for detecting timing references affected by a change in path delay asymmetry between nodes in a communication network
Giulio Bottari, Pisa (IT); and Stefano Ruffini, Pisa (IT)
Assigned to Telefonaktiebolaget LM Ericsson (Publ), Stockholm (SE)
Appl. No. 14/913,143
Filed by Telefonaktiebolaget L M Ericsson (publ), Stockholm (SE)
PCT Filed Aug. 22, 2013, PCT No. PCT/EP2013/067492
§ 371(c)(1), (2) Date Feb. 19, 2016,
PCT Pub. No. WO2015/024599, PCT Pub. Date Feb. 26, 2015.
Prior Publication US 2016/0211936 A1, Jul. 21, 2016
Int. Cl. H04L 12/28 (2006.01); H04J 3/06 (2006.01); H04L 12/26 (2006.01); H04L 12/24 (2006.01)
CPC H04J 3/0682 (2013.01) [H04J 3/0641 (2013.01); H04J 3/0667 (2013.01); H04L 41/12 (2013.01); H04L 43/0858 (2013.01)] 25 Claims
OG exemplary drawing
 
1. A method of detecting a timing reference affected by a change in path delay asymmetry in a communications network comprising a master node having a master clock and a plurality of slave nodes each having a respective slave clock, the method comprising:
determining that a first timing reference received by a first slave node indicates a time correction to its slave clock greater than a time correction threshold;
determining whether one or more other slave nodes have received a timing reference indicating a time correction to their slave clock greater than a time correction threshold; and
determining whether the first timing reference is affected by a change in path delay asymmetry based on the determining of whether one or more other slave nodes have received a timing reference indicating a time correction to their slave clock greater than a time correction threshold.