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However, this method not only consumes manpower and material resources, but also when the link changes, the device cannot automatically measure the real asymmetric delay, thus reducing the quality of time synchronization
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Embodiment 1
[0054] combine figure 2 As shown, in the 1588 time synchronization protocol, the calculation formula of the time offset is: Offset=((T2-T1)-(T4-T3)) / 2, and the assumption of this formula is that the uplink and downlink delays are equal.
[0055] If the uplink delay (D2) and downlink delay (D1) are considered, the actual calculation formula is: Offset=((T2-T1)-(T4-T3)) / 2+(D2-D1) / 2.
[0056] Therefore, the time deviation calculated by the two differs by (D2-D1) / 2.
[0057] In combination with the above content, the implementation method for automatically compensating for the asymmetry of 1588 uplink and downlink delays provided in this embodiment mainly includes the following steps:
[0058] Step 1. Configure the time synchronization deviation range;
[0059] That is, in the case of no asymmetric delay, the accuracy of device time synchronization, in nanoseconds.
[0060] Step 2. Configure the 1588 slave clock to synchronize the time of the master clock.
[0061] Step 3. ...
Embodiment 2
[0070] Such as image 3 As shown, an implementation system for automatically compensating 1588 uplink and downlink asymmetric delay provided in the embodiment of the present invention mainly includes the following modules:
[0071] Device synchronization accuracy configuration module: mainly responsible for configuring the 1588 time synchronization deviation range of the device, that is, the time synchronization accuracy of the device without the asymmetric delay of the 1588 uplink and downlink.
[0072] Asymmetric measurement period configuration module: responsible for configuring the asymmetric measurement period.
[0073] 1588 protocol processing module: mainly responsible for the configuration of 1588 protocol, sending, receiving and time stamp processing, as well as the calculation of time deviation and link delay.
[0074] Asymmetry measurement module: mainly responsible for periodically detecting the asymmetry delay of the 1588 uplink and downlink according to the con...
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PUM
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Abstract
The invention discloses a method and a system for realizing self-compensation 1588 link asynchronous time delay. The method comprises the steps of: measuring and calculating an asynchronous time delay value between an uplink and a downlink of a 1588 link; when the asynchronous time delay value exceeds a set synchronous offset range, carrying out asynchronous time delay compensation; or else, continuing 1588 normal time synchronization. With adoption of the method and the system disclosed by the invention, the asynchronous time delay can be corrected automatically so as to ensure the quality of 1588 time synchronization.
Description
technical field [0001] The invention relates to the technical field of 1588 clock network, in particular to a method and system for automatically compensating the asymmetric time delay of 1588 links. Background technique [0002] With 3G (3 rd Generation, the third generation of mobile communication technology) with the rapid development of the network, the 1588 time synchronization protocol has received more and more attention and application in the communication network. Domestic and foreign operators continue to use the 1588 protocol for time synchronization, and gradually replace the time synchronization with GPS (Global Positioning System, Global Positioning System). [0003] Such as figure 1 As shown, in 1588 time synchronization, the synchronization method is as follows: [0004] Depend on figure 1 The following formula can be obtained: [0005] A=t 1 -t 0 =Delay+Offset; (1) [0006] B=t 3 -t 2 = Delay-Offset; (2) [0007] Then according to the above formu...
Claims
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