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An Air Interface Synchronization Method for Multipoint Cooperation in TDD Distributed Network

A distributed network, air interface synchronization technology, applied in the field of multi-point cooperative air interface synchronization, can solve the problem of inability to eliminate the asynchronous state, and achieve the effect of high synchronization accuracy and good stability

Inactive Publication Date: 2017-06-06
SHANGHAI RES CENT FOR WIRELESS COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This out-of-sync state cannot be eliminated using a single-source sync approach

Method used

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  • An Air Interface Synchronization Method for Multipoint Cooperation in TDD Distributed Network
  • An Air Interface Synchronization Method for Multipoint Cooperation in TDD Distributed Network
  • An Air Interface Synchronization Method for Multipoint Cooperation in TDD Distributed Network

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Embodiment 1

[0037] This embodiment provides an air interface synchronization method for multi-point coordination in a TDD distributed network, such as Figure 4 As shown, the method mainly includes the following steps:

[0038] (1) First, the home base station HNB i Select the appropriate multiple synchronization sources.

[0039] Home base station HNB i There are many methods for selecting a synchronization source, for example, multiple synchronization sources may be randomly selected.

[0040] Preferably, signal strength can be used as a basis for selecting a synchronization source. Home base station HNB i By measuring the signal strength of neighboring cells, the selected strength is greater than the lowest threshold Q th J of them are used as synchronization sources. Set the minimum threshold Q th The accuracy of synchronization can be guaranteed and unnecessary synchronization process can be reduced. Referring to the standard for UE to select a cell, determine the threshold f...

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Abstract

The invention discloses an air interface synchronization method with multi-point cooperation in a TDD distributed network. The method comprises the following steps that: (1) a home NodeB (HNBi) selects J neighbor nodes satisfying a certain condition as synchronization sources; (2) the home HNBi carries out an air interface synchronization process with the J synchronization sources respectively, the HNBi carries out air interface synchronization with each synchronization source respectively through disguising the HNBi as a user terminal, and synchronous timing of the J synchronization sources is obtained; (3) the HNBi determines synchronization timing Ti, opt of the HNBi such that a weighted sum of squares of a difference between the above synchronization timing and the synchronous timing of the J synchronization sources is minimal; (4) the HNBi determines whether synchronization satisfies a requirement, if so, the synchronization process is ended; and otherwise, the process of the method returns to the step (1) and enters into a next synchronization cycle. The synchronization method of the invention has the characteristics of high accuracy, good stability, no need of central node control, and ability of self organization and self optimization.

Description

technical field [0001] The invention belongs to the technical field of mobile communication networks, and relates to an air interface synchronization method for multi-point coordination in a TDD distributed network. Background technique [0002] Compared with an FDD (Frequency Division Duplexing, frequency division duplexing) system, a TDD (Time Division Duplexing, time division duplexing) system has higher requirements on synchronization between base stations. On the one hand, if the adjacent base stations are not synchronized, there will be inter-slot interference and uplink and downlink interference, which will seriously affect the communication quality and even lead to communication failure. On the other hand, it is also necessary to ensure that the synchronization error between the serving base station and the target base station is within a certain range during handover, otherwise the handover will fail. As a network node, a TDD home base station has similar functions...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W56/00
Inventor 刘立刚王江徐景杨旸
Owner SHANGHAI RES CENT FOR WIRELESS COMM
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