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

A time-division duplex and cellular system technology, applied in multi-frequency code systems, communication between multiple stations, etc., can solve problems such as inapplicable access systems, and achieve the effect of simplified implementation

Active Publication Date: 2007-07-25
SHANGHAI ULTIMATE POWER COMM TECH
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  • Claims
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AI Technical Summary

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

Method used

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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

[0065] During the transition from the TD-SCDMA system to the broadband time division duplex cellular system, the existing 1.6MHz (megahertz) TD-SCDMA system may share some frequency bands with its evolved system, and the base stations of the two systems often need to be located in the same geographical location Location.

[0066] 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 mutual interference, it is necessary to limit the DwPTS time length of the gap. That is to say, the center position of the GP time slot of the TD-SCDMA evolution system must be aligned with the existing TD-SCDMA system, so as to ensure that the adjacent frequency interference will not be caused. At the same time, the length of the GP time slot determines the maximum value of the cell coverage radius, and it must be ens...

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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), in particular to a synchronization method of the broadband time division duplex cellular system and a cell initial search using the method 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 developme...

Claims

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Application Information

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IPC IPC(8): H04B7/26H04L27/26
Inventor 孙韶辉于洋王映民
Owner SHANGHAI ULTIMATE POWER COMM TECH
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