Multi-hop wireless backhaul network time synchronization error compensation method based on ptp protocol

A PTP protocol, synchronization error technology, applied in the direction of synchronization device, wireless communication, synchronization information channel, etc., can solve the problem of high development cost, and achieve the effect of reducing development cost, realizing real-time correction, and strong practicability

Active Publication Date: 2018-06-19
SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

At the same time, open source Wi-Fi chips are not available in the current market, and the development cost of designing the MAC layer of Wi-Fi based on FPGA is too high, so it is not advisable to design wireless network nodes based on the PTP protocol

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  • Multi-hop wireless backhaul network time synchronization error compensation method based on ptp protocol
  • Multi-hop wireless backhaul network time synchronization error compensation method based on ptp protocol
  • Multi-hop wireless backhaul network time synchronization error compensation method based on ptp protocol

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Embodiment Construction

[0047] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0048] The method of the present invention comprises the following steps: building the nodes on site into a hierarchical multi-hop network structure; adopting the two-step synchronization mode under the PTP protocol; utilizing intermediate nodes to complete the forwarding of the PTP synchronization message Sync and the delay request message Delay_Req Time and link delay detection and compensation to realize time synchronization error compensation.

[0049] Such as figure 1 As shown, the hierarchical multi-hop wireless network structure built by the present invention. The root node in the network is used as the time source, that is, the master node; the leaf nodes are used as slave nodes, which communicate with the master node through multi-hop methods, and are responsible for information fusion of the access network as access nodes. The inte...

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Abstract

The invention relates to wireless network communication technology, in particular to a multi-hop wireless backhaul network time synchronization error compensation method based on PTP protocol. Based on the PTP protocol, the present invention uses intermediate nodes to count the time stamps of sending and receiving the PTP synchronization message Sync and the delay request message Delay_Req, and detects and compensates the local forwarding of the synchronization message Sync and the delay request message Delay_Req based on linear regression technology Time and the link delay of the transmission between nodes, and finally realize the asymmetric delay correction of the wireless link of the master-slave node, and complete the time synchronization error compensation. The present invention does not modify the existing PTP protocol, and uses additional time information such as the header transmission compensation time of the PTP message, message sending and arrival time, and time correction value to reduce message overhead and meet the real-time performance of time synchronization error compensation As well as high precision requirements, the existing time synchronization precision is improved, and the practicability is strong.

Description

technical field [0001] The invention relates to the field of wireless network communication, in particular to a multi-hop wireless backhaul network time synchronization error compensation method based on the PTP protocol. Background technique [0002] Multi-hop Wireless Backhaul Networks (MWBNs) aim to provide high-speed, long-distance, non-line-of-sight and low-cost wireless access services, making up for the difficulty of wiring, high cost, and network coverage of wired backhaul networks. Limitations and poor topology flexibility. Due to the harsh factory environment and difficult wiring, and in order to improve factory production efficiency, new industrial applications such as digital oil fields, smart grid wide-area interconnection, and industrial robot collaborative operation urgently need to build a wireless backhaul network integrating management and control to complete regional coverage and realize measurement and control. Mixed transmission of information such as c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J3/06
CPCH04J3/0635H04J3/0667H04J3/0673H04L7/0012H04W56/00H04L67/2885H04J3/0682H04L67/147H04W92/24
Inventor 曾鹏王照伟李志博李栋王金涛
Owner SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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