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A fast downlink primary synchronization method for td-lte cell handover

A technology of cell handover and main synchronization, applied in the direction of synchronization device, synchronization signal speed/phase control, electrical components, etc., can solve the problems of handover failure, UE cannot synchronize downlink of B38 target cell, etc., and achieve low operation and implementation complexity, The effect of saving on-chip cache overhead

Active Publication Date: 2018-02-02
CHINA ACADEMY OF INFORMATION & COMM +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the buffer capacity of the terminal is about 1.5ms, so the UE cannot synchronize with the downlink of the B38 target cell, resulting in handover failure

Method used

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  • A fast downlink primary synchronization method for td-lte cell handover
  • A fast downlink primary synchronization method for td-lte cell handover
  • A fast downlink primary synchronization method for td-lte cell handover

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Embodiment Construction

[0046] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The specific embodiments described here are only used to explain the present invention, but not used to limit the present invention.

[0047] Such as figure 1 As shown, the present invention provides a fast downlink master synchronization method for TD-LTE cell handover, which includes the following steps: the terminal chip first processes the local PSS signal; then the terminal chip receives it in the corresponding time period before and after the PSS of the serving cell The signal of the target cell is down-sampled through the sliding window; the correlation coefficient between the signal after the sliding window down-sampling and the signal after the local down-sampling is calculated. The definition of the correlation coefficient takes into accou...

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Abstract

The invention discloses a rapid downlink main synchronization method used for TD-LTE (time division duplex-long-term evolution) cell switching. The method includes the following steps: a terminal chip processes local PSS signals; the terminal chip receives signals of a target cell in corresponding previous and next time cycles of a service cell PSS; downsampling is carried out on the received signals through a slide window; a correlation factor of signals which undergo the downsampling through the slide window and signals which undergo local downsampling processing is calculated; a whole section is traversed through a mobile window and a PSS sequence number and a PSS sequence start point position corresponding to a maximum of the correlation factor and it is regarded that a PSS is sent in a window corresponding to the maximum of the correlation factor; synchronization judgments are added up; main synchronization is over; and if a current synchronization judgment is wrong, the above process continues to be repeated in a next receiving section. The method does not need to modify the prior protocol or add extra signaling overhead, and is low in operational and realization complexity and convenient to use in a practical TD-LTE system.

Description

Technical field [0001] The present invention relates to the technical field of wireless communication systems, in particular to a fast downlink master synchronization method for TD-LTE cell handover. Background technique [0002] TD-LTE is the evolution of TD-SCDMA (Time Division Duplex-Synchronous Code Division Multiplexing Access). Through the use of OFDM (Orthogonal Frequency Division Multiplexing), MIMO (Multiple Input Multiple Output), fast scheduling and other technologies, TD- The peak rate and spectrum efficiency of LTE have been greatly improved compared to TD-SCDMA. At present, 20MHz of 1880MHz-1900MHz in the frequency band B39 (1880MHz-1920MHz) used in China's TD-LTE test has been allocated to the TD-SCDMA system. If 20MHz of 1900MHz-1920MHz in B39 is used for the TD-LTE system, then in order to avoid For uplink and downlink interference between systems, it is necessary to keep the uplink and downlink switching points of the two systems synchronized in time. [0003] T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L7/04H04W36/08H04W56/00
CPCH04W36/0077H04W36/08H04W56/00
Inventor 张翔李文宇宋丽娜胡泊魏贵明万屹
Owner CHINA ACADEMY OF INFORMATION & COMM