System and methods for network synchronization

A network element and clock synchronization technology, applied in the field of communication networks, can solve the problems of node offline, node synchronization signal interference, etc.

Active Publication Date: 2019-04-02
HONOR DEVICE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Synchronization using an over-the-air channel exposes nodes to sync signal interference, which can cause nodes to go offline

Method used

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  • System and methods for network synchronization
  • System and methods for network synchronization
  • System and methods for network synchronization

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Embodiment Construction

[0032] Due to the precise synchronization requirements of such networks, embodiments will be discussed with reference to specific examples for use within next generation wireless networks. For example, it is expected that next-generation wireless networks utilizing optical fronthaul connections from antennas to base stations (or from remote radio heads to C-RAN clusters) will have synchronization requirements on the order of + / -8nsec. It should be understood, however, that the methods and systems described herein are not limited to next generation wireless systems, and may be used in other systems with precise timing requirements, such as some industrial applications or servers for financial services that have timing requirements for settlement of financial transactions.

[0033] Some embodiments relate to methods and systems for synchronizing network elements without requiring each network element to rely on an over-the-air connection to a master clock (eg, relying on GPS rece...

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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 twoNEs 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.

Description

[0001] Related Application Cross Reference [0002] This application claims priority to U.S. Patent Application No. 15 / 261,401, filed September 9, 2016, and entitled "System and Method for Determining Propagation Delay," and filed on May 26, 2017. Priority to US Patent Application No. 15 / 607,031, entitled "System and Method for Network Synchronization," filed on . The entire contents of both applications are hereby incorporated by reference in their entirety. technical field [0003] The invention relates to the field of communication networks, in particular to network synchronization. Background technique [0004] Next generation networks, including next generation wireless networks, are expected to require clock synchronization between network elements within the network. Such a network element may include a base station, a remote radio head, a cloud radio access network (Cloud Radio Access Network, C-RAN) data center baseband unit (baseband unit, BBU), and the like. Ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/00
CPCH04J3/0667H04B10/2507H04B10/40H04L7/0075
Inventor 迈克尔·迈耶哈米德·麦赫瓦
Owner HONOR DEVICE CO LTD
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