Telefonaktiebolaget Lm Ericsson (publ)

Qingfeng Yang

Francesco Pasio

Ming Wang

Stefano Ruffini

Guoliang Gao

Baifeng Cui

Zhendong Lei

A method in a first network entity, which is capable of communicating over a plurality of communication links with a second network entity using a two-way timestamp exchange, comprises the step of receiving at the first network entity a first message from the second network entity. The link on which the first message was received is determined. Based on the determination of the link, a second message is transmitted from the first network entity to the second network entity on the same link.

Apparatus and method for two-way timestamp exchange

A pluggable transceiver module () comprising a line receiver () connected to a unit interface transmitter (), a line transmitter () connected to a unit interface receiver () and a timestamp counter () adapted to generate counter values based on clock signals received from an external source and to send the counter values to the line transmitter () and to the line receiver (). The line transmitter () and the line receiver () are adapted to associate timing packets in a stream of data packets transmitted and received by the pluggable transceiver module () with counter values output by the timestamp counter ().

Time synchronous pluggable transceiver

A technique for facilitating clock recovery in a node of a packet-based network is disclosed. The node is synchronized with other nodes based on a master-slave clock mechanism. A list of backup master clock node is maintained for the node, which includes at least one backup master clock node for the node, and in response to occurrence of a synchronization related event, a master clock node of the node is switched from the current master clock node to a backup master clock node selected from the list. A master clock node reselection message is generated and transmitted to the switched backup master clock node for the switched backup master clock node to reselect its master clock node.

Clock recovery in a packet based network

A method and system for maintaining clock synchronization in a communication network having multiple clocks are disclosed. According to one aspect, the invention provides a first precision time protocol (PTP) instance and second PTP service instance. Dynamic PTP parameters and tuning PTP parameters are periodically cloned from the first PTP service instance to the second PTP service instance substantially in real time.

Growing community of inventors

Beijing, China

Qingfeng Yang