METHODS AND NODES FOR SYNCHRONISATION OF NETWORKS

摘要

Method and arrangement for providing delay information to synchronisation packets passing a transport network node. In a transport network node synchronisation packets propagate from a synchronisation master node towards boundary clock nodes. The synchronisation packets pass the transport network node, in which the synchronisation packets are received, and a level of delay is determined. Furthermore, when the level of delay for the synchronisation packets is above a threshold, the synchronisation packets are marked with a delay indication. The received synchronisation packets are sent to the boundary clock node or ordinary clock node, whether or not they are marked. By implementing functionality for determining a level of delay of synchronisation packets, and marking passing synchronisation packets with delay indications, boundary clock nodes and ordinary clock nodes may differentiate the received synchronisation packets based on the delay identifications. Thereby, improved accuracy may be achieved when calculating time synchronisation offsets.

主权项

1. A method performed by a synchronisation report module of a first transport network node for providing delay information to synchronisation packets passing the first transport network node, the method comprising:
receiving a first synchronisation packet originating from a second transport network node, determining a level of delay for the first synchronisation packet caused by the first transport network node, when the level of delay for the first synchronisation packet is above a first threshold, marking the first synchronisation packet with a delay indication, and sending the first synchronisation packet towards a third transport network node.