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A Synchronization Method Oriented to LTE Small Cell Dense Networking

A dense networking and small station technology, applied in the direction of synchronization devices, data exchange networks, digital transmission systems, etc., can solve problems such as interception signal errors, loss of useful signals, and inability to intercept, so as to eliminate isolated base stations and improve quality , Reduce the effect of interlayer interference

Active Publication Date: 2021-06-22
NANJING UNIV OF POSTS & TELECOMM
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AI Technical Summary

Problems solved by technology

Air interface listening synchronization cannot be synchronized in some areas without macro stations. Secondly, high-density LTE small stations will bring strong interference. When using air interface listening for synchronization, inter-base station interference signals will lose useful signals. When listening to the signal, there will be errors or even the situation where it cannot be listened to

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  • A Synchronization Method Oriented to LTE Small Cell Dense Networking
  • A Synchronization Method Oriented to LTE Small Cell Dense Networking
  • A Synchronization Method Oriented to LTE Small Cell Dense Networking

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specific Embodiment

[0036] figure 1 What is shown is an application scenario diagram of the synchronization method oriented to dense networking of LTE small cells. figure 1 The small base station shown in is a small base station under the coverage of a macro station. T in the figure i Indicates the synchronization level of the base station. The synchronization level is defined as the minimum number of hops between the cell's time information source and the GPS time information source. In this scenario, the macro station only provides a public reference time source and does not participate in the synchronization process. The synchronization level of the macro station is T 0 . figure 1 mainly revolves around the synchronization hierarchy for T 1 clusters of small base stations. In addition, clustering and centralized management can combine base stations with high similarity, which can reduce the difficulty of operation.

[0037] figure 2 Shown is the flowchart of the synchronous method of t...

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Abstract

The invention discloses a synchronization method for LTE small cell dense networking. Firstly, layering is carried out according to the minimum number of hops between the time information source of the base station and the GPS time information source, and the maximum clustering index value between base stations is The goal is to cluster the base stations, and select the final clustering result based on the minimum correlation index value of the cluster under the premise of satisfying the cluster size; then, expand downward with the clustering center, and determine the base station to be synchronized according to the maximum SINR between base stations Listen to the path of the reference base station until all base stations have determined the optimal synchronization listening path; finally, the LTE small station listens to the synchronization reference signal according to the synchronization path planning result, analyzes the synchronization signal to obtain synchronization information, and according to the synchronization information Adjust its own clock to achieve synchronization. The invention can reduce the synchronous signal interference between base stations, ensure the quality of the synchronous signal, select the best synchronous source, ensure the optimal synchronous precision and reduce the difficulty of synchronous operation.

Description

technical field [0001] The present invention relates to the field of 5G ultra-dense networking, in particular to a synchronization method for LTE small cell dense networking. Background technique [0002] Ultra-dense network (UDN) meets the requirements of high-traffic and high-density wireless terminal access by deploying a large number of wireless devices. If the small base stations in each area are not synchronized, the impact of interference will be aggravated, and strong interference will seriously affect the call quality and network speed. [0003] In traditional cellular networks, there are mainly three technologies used for base station synchronization: GPS synchronization, PTP synchronization, and air interface listening synchronization. However, in the UDN scenario, GPS synchronization needs to install antenna equipment for receiving GPS signals on LTE small cells, which increases the cost of the equipment, poor reception of satellite signals indoors, and increase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W40/16H04W40/32H04W56/00H04L12/715
CPCH04L45/46H04W40/16H04W40/32H04W56/001
Inventor 刘旭黄志朱雯慧姜杰朱晓荣杨龙祥朱洪波
Owner NANJING UNIV OF POSTS & TELECOMM
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