Title:
SYSTEM AND METHODS FOR NETWORK SYNCHRONIZATION
Document Type and Number:
WIPO Patent Application WO/2018/045857
Kind Code:
A1
Abstract:
One aspect of the disclosure is directed to a system and method for determining the propagation delay for a signal to traverse an optical fiber between two transceivers. The method is performed by a first network element and includes transmitting a message to a second transceiver over a first optical fiber. The method further includes configuring both network elements such that the first NE receives a reply message from the second NE on the first optical fiber. This reply message includes an indication of the internal time for the second NE to transmit the reply message. Accordingly the one way propagation delay on the first optical fiber can be determined. Another aspect is directed to a system and method for using the determined one way propagation delay to synchronize clocks of the two NEs using a symmetric network synchronizing protocol such as precision timing protocol, and correcting for differences in the one way propagation delays which make up the round trip propagation delay. Some embodiments can do this without stopping the operation of the network while pausing (buffering) data flows while the one way propagation delays are determined.
Inventors:
MAYER MICHAEL (CA)
MEHRVAR HAMID (CA)
MEHRVAR HAMID (CA)
Application Number:
PCT/CN2017/097120
Publication Date:
March 15, 2018
Filing Date:
August 11, 2017
Export Citation:
Assignee:
HUAWEI TECH CO LTD (CN)
International Classes:
H04L7/00
Domestic Patent References:
| WO2015024599A1 | 2015-02-26 |
Foreign References:
| CN101098219A | 2008-01-02 | |||
| CN103119872A | 2013-05-22 |
Other References:
See also references of EP 3491753A4
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