Clock synchronization method and device of communication network

A clock synchronization and communication network technology, which is applied in the field of communication systems, can solve problems such as network clock degradation and data transmission impact, and achieve the effects of improving synchronization quality, preventing clock degradation, and preventing clock looping

Inactive Publication Date: 2012-12-12
ZTE CORP
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Problems solved by technology

Due to the existence of the clock looping problem, when a certain upstream clock in the network deviates, it

Method used

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  • Clock synchronization method and device of communication network
  • Clock synchronization method and device of communication network
  • Clock synchronization method and device of communication network

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Embodiment Construction

[0070] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0071] Such as figure 1 as shown, figure 1 It is a flow chart of the first embodiment of the communication network clock synchronization method of the present invention. The communication network clock synchronization method mentioned in this embodiment includes:

[0072] Step S101, the current clock node receives the notification message and other PTP protocol messages sent by the upstream clock node;

[0073] The PTP protocol defines event messages and general messages. An event message is a time message that contains precise time stamps generated by the sender and receiver; ordinary messages do not require precise time stamps. The notification message in the general message carries information such as clock priority, clock quality level, clock accuracy, clock ID, and step size, and is used to establish a master-...

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Abstract

The invention discloses a clock synchronization method and a device of a communication network. The method comprises the steps of: a current clock node receives a notification message and other PTP (Precision Time Protocol) protocol messages sent by an upstream clock node; when judging that the current clock node needs to be synchronized with the upstream clock node, extracting a grandfather clock ID in the notification message; and when judging that the grandfather clock ID in the notification message is different from the own clock ID of the current clock node or judging that the grandfather clock ID in the notification message is different from the clock ID recorded by the current clock node, carrying out time synchronization operation according to time information of the other PTP protocol message and time information of the current clock node. The invention has the advantages that the occurrence of a clock loop is effectively prevented, normal synchronization between the clock nodes in the network is ensured, the own strategy is adjusted when the clock loop occurs on the upstream, the synchronization with a clock source with the loop is avoided, the clock deterioration is prevented, and the synchronization quality is improved.

Description

technical field [0001] The invention relates to the technical field of communication systems, in particular to a communication network clock synchronization method and device. Background technique [0002] Clock synchronization is very important to the communication system. The inconsistency of the clock frequency of the transmitting and receiving equipment of the communication equipment will lead to faults such as bit errors, slipping codes, and frame loss. Especially in wireless networks, there are stringent requirements for high-precision synchronization. Wireless systems based on FDD mode (such as WCDMA) need to maintain frequency synchronization between nodes, while wireless systems based on TDD mode (such as CDMA2000, TD-SCDMA, WiMAX, LTE) require stricter time synchronization to meet Roaming and handover for mobile services. [0003] In traditional solutions, base stations with time requirements can only obtain time from GPS. However, the installation of the GPS an...

Claims

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Application Information

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IPC IPC(8): H04J3/06
CPCH04J3/06H04J3/0688H04J3/0664
Inventor 张卫娥
Owner ZTE CORP
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