US 12,388,549 B2
Method and time synchronization (TS) node for enabling extended holdover time
Jun Wang, Beijing (CN); Yao Peng, Beijing (CN); and Guoliang Gao, Beijing (CN)
Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
Appl. No. 17/923,689
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed May 6, 2020, PCT No. PCT/CN2020/088776
§ 371(c)(1), (2) Date Nov. 7, 2022,
PCT Pub. No. WO2021/223102, PCT Pub. Date Nov. 11, 2021.
Prior Publication US 2023/0179313 A1, Jun. 8, 2023
Int. Cl. H04J 3/06 (2006.01)
CPC H04J 3/0641 (2013.01) [H04J 3/0667 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method at a time synchronization (TS) node for enabling extended holdover time, the method comprising:
detecting whether the TS node loses time synchronization with its master TS node or not;
transmitting a first announce message comprising a first indicator to one or more slave TS nodes in response to detecting that the TS node loses the time synchronization with its master TS node, wherein the first indicator indicates a holdover time budget to be used while the TS is in a holdover state, for enabling extended holdover time at the one or more slave TS nodes; and
after an initial transmission of the first announce message, one or more further transmissions of the first announce message occurring periodically with a value of the holdover time budget comprised in the first announce message being gradually reduced as the time elapses.