Synchronizing method for broad band time division duplex honey comb system and cell primary searching

A technology of time division duplex, cellular system, applied in the direction of synchronization device, electrical components, wireless communication, etc., can solve the problem of inapplicable access system, etc., to achieve the effect of simplified implementation

Active Publication Date: 2012-10-17
SHANGHAI ULTIMATE POWER COMM TECH
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  • Abstract
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Problems solved by technology

[0008] The invention aims to solve the problem that the synchronization method in the prior art is not applicable to the access system where the DwPTS time slot adopts the OFDM modulation mode

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  • Synchronizing method for broad band time division duplex honey comb system and cell primary searching
  • Synchronizing method for broad band time division duplex honey comb system and cell primary searching
  • Synchronizing method for broad band time division duplex honey comb system and cell primary searching

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Embodiment Construction

[0066] During the transition from TD-SCDMA system to broadband time-division duplex cellular system, the existing 1.6MHz (MHz) TD-SCDMA system may share some frequency bands with its evolved system, and the base stations of the two systems often need to be set in the same geographic location Location.

[0067] According to the frame structure characteristics of TD-SCDMA and its evolution system, in order to enable the TD-SCDMA evolution system and the existing TD-SCDMA system to implement adjacent frequency co-site deployment without causing interference to each other, it is necessary to limit the DwPTS time The length of the gap. That is, the central position of the GP time slot of the TD-SCDMA evolved system must be aligned with that of the existing TD-SCDMA system, so as to ensure that adjacent frequency interference will not be caused. At the same time, the length of the GP time slot determines the maximum value of the coverage radius of the cell, and a certain length of ...

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Abstract

The synchronization (sync) method includes steps: based on repetition characteristic at time domain of down going pilot frequency symbol (PFS) in DwPTS to carry out difference correlation for time domain sequence of received at least one sub frame length; based on peak value of difference correlation to carry out synchronous searching. The invention also discloses a method for searching sector primarily (SSP) including coarse time sync and coarse correction of frequency deviation based on sync channel; and fine correction of frequency deviation and fine procedure of time sync based on PFS of TS0 time slot. Aiming at requirement of broadband time division duplexing cellular system, the invention sets up down going PFS on down going sync channel SCH as repetition characteristic at time domain; based on the setting, the invention carries out time sync and SSP based on OFDM symbol so as to realize sync between UE and access system effectively, and complete SSP.

Description

technical field [0001] The invention relates to a broadband time division duplex cellular system of an evolution scheme of TD-SCDMA (Time Division Synchronous Code Division Multiple Access, time division synchronous code division multiple access), and in particular to a synchronization method for a broadband time division duplex cellular system and a cell starter using the method. search method. Background technique [0002] TD-SCDMA is the only one among the three major international standards of the third-generation mobile communication system that adopts Time Division Duplex (TDD, Time Division Duplex) mode, supports uplink and downlink asymmetric service transmission, and has greater flexibility in spectrum utilization. The system comprehensively adopts advanced technologies in wireless communication such as smart antenna, uplink synchronization, joint detection and software radio, so that the system has high performance and spectrum utilization. [0003] With the devel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W56/00
Inventor 孙韶辉于洋王映民
Owner SHANGHAI ULTIMATE POWER COMM TECH
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