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Air interface time synchronization method and device

A time synchronization and equipment technology, applied in the field of communication, can solve the problems of high maintenance cost, high construction cost, low time synchronization accuracy, etc., and achieve the effect of low cost and high accuracy

Active Publication Date: 2022-07-29
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using GPS for time synchronization has the problems of high construction cost and high maintenance cost. Using 1588V2 for time synchronization must require a wired connection to be realized, and the accuracy of time synchronization is not high

Method used

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  • Air interface time synchronization method and device
  • Air interface time synchronization method and device
  • Air interface time synchronization method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0235] see image 3 , image 3 Shown is the process of exchanging packets between the second device and the first device, and the process includes but is not limited to the following steps:

[0236] Step 301: The second device sends a first packet in response to the above air interface time synchronization request to the first device.

[0237] In a specific embodiment, after receiving the air interface time synchronization request sent by the first device, the second device may first send an acknowledgement message to the first device according to the request to inform the first device that the request has been received. Then, the second device regenerates the first packet in response to the request, and sends the first packet to the first device through the second radio frequency channel. The second radio frequency channel may be any one of a plurality of radio frequency channels in the second device. The second radio frequency channel includes an interface on the baseband...

Embodiment 2

[0308] see Figure 7 , Figure 7 Shown is the process of exchanging packets between the second device and the first device, and the process includes but is not limited to the following steps:

[0309] Step 701: The second device sends a first packet in response to the above air interface time synchronization request to the first device.

[0310] Step 702: The first device receives the first packet.

[0311] Step 703: The first device sends a second packet in response to the first packet to the second device.

[0312] Step 704: The second device receives the second packet.

[0313] For specific descriptions of the steps 701 to 704, reference may be made to the descriptions corresponding to the steps 301 to 304 in the first embodiment, and details are not repeated here.

[0314] Step 705: The second device sends a fourth message sent in response to the second message to the first device, where the fourth message includes the time t1 when the second device sends the first mes...

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Abstract

Embodiments of the present application provide an air interface time synchronization method and device. The method includes: a first device sends an air interface time synchronization request to a second device; the first device exchanges packets with the second device based on the request to obtain the air interface time synchronization request. Air interface time synchronization calculation information, the calculation information includes the moment when the second device sends the first packet at the second air interface and the moment when the second packet is received at the second air interface, and the first device at the first The time at which the first packet is received at the air interface and the time at which the second packet is sent at the first air interface; the first device calculates the time deviation of the air interface between the first device and the second device according to the calculation information ; the first device adjusts the crystal oscillator according to the time offset. By adopting the embodiments of the present application, the cost can be reduced and the calculation accuracy can be improved.

Description

technical field [0001] The present invention relates to the field of communication technologies, and in particular, to an air interface time synchronization method and device. Background technique [0002] In a heterogeneous network where wired and wireless converge, in order to reduce interference and improve the reliability of data transmission, it is often necessary to use different means to achieve time synchronization between multiple devices. Among them, the wired backbone network commonly uses methods such as global positioning system (GPS), 1588V2, and clock recovery (clock and data recovery, CDR) in serializer / deserializer (SERDES) to realize wired interconnection. Device time synchronization. For synchronization between wireless devices, air interface synchronization is often realized by the interaction of related standard air interface frame sequences. [0003] On the wired network side, time synchronization between multiple points is often performed by means of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
CPCH04L27/2671
Inventor 应腾达杨坚锐黄俊红周志辉
Owner HUAWEI TECH CO LTD
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