Communication network nodes and methods performed therein

摘要

Determining a time synchronization inaccuracy value between a first node and a second node. A PTP packet is received including Node IDs representing respective transport nodes along a first path, and from the second node Node IDs are obtained representing respective transport nodes along a second path. Furthermore, a first common node of the first path and the second path is determined. The time synchronization inaccuracy value between the first node and the second node is calculated. By including Node IDs in received PTP packets before forwarding them to a node, the node is enabled to determine a first common node. Thereby, the node may calculate relative time inaccuracy values with respect to the other access network nodes, which may be used to decrease inaccuracy time synchronization for co-ordination functions.

主权项

1. A method performed by a transport network node, the method comprising:
receiving a Precision Time Protocol, PTP, packet from a grandmaster entity, including a node identification, Node ID, of the transport network node in the PTP packet, and sending the PTP packet to an access network node, the Node ID being configured for subsequent use by the access network node for determining a time synchronisation inaccuracy between the access network node and a further access network node.