System and method for network synchronization
A network element and clock synchronization technology, applied in the field of communication networks, can solve problems such as node offline, node synchronization signal interference, etc.
Active Publication Date: 2020-10-09
HONOR DEVICE CO LTD
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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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[0032] Due to the precise synchronization requirements of such networks, the embodiments will be discussed with reference to specific examples used in next-generation wireless networks. For example, it is expected that next-generation wireless networks that utilize optical fronthaul connections from antennas to base stations (or from remote radio heads to C-RAN clusters) will have + / -8nsec-level synchronization requirements. However, it should be understood that the methods and systems described here are not limited to next-generation wireless systems, and can 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 (for example, relying on a GPS receiver ...
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One aspect of the present disclosure relates to a system and method for determining the propagation delay of a signal through an optical fiber between two transceivers. The method is performed by the first network element. The method includes sending a message over the first optical fiber to the second transceiver, and the method further includes configuring the two network elements such that the first network element (NE) receives a reply message from the second NE on the first optical fiber. The reply message includes an indication of the internal time for the second NE to send the reply message. Thus, the one-way propagation delay on the first fiber can be determined. Another aspect relates to a system and method for synchronizing clocks of two NEs using a determined one-way propagation delay using a symmetric network synchronization protocol such as the Precision Time Protocol, and correcting for the one-way propagation that constitutes the round-trip propagation delay difference in latency. Some embodiments may do so while pausing (buffering) the data stream, while determining the one-way propagation delay, without halting network operations.
Description
[0001] Cross reference to related applications [0002] This application claims priority to the U.S. patent application filed on September 9, 2016, with application number 15 / 261,401, entitled "System and Method for Determining Propagation Delay", and enjoys the right of priority on May 26, 2017 Priority of the U.S. patent application filed on 15 / 607,031 and entitled "System and Method for Network Synchronization". The entire contents of the two applications are incorporated herein 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] It is expected that next-generation networks including next-generation wireless networks require clock synchronization between network elements within the network. Such network elements may include base stations, remote radio heads, Cloud Radio Access Network (C-RAN) data center baseband units (BBU), and the like. ...
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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