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Methods and apparatus for LTE cell search with large frequency offset

A cell search and frequency offset technology, which is used in multi-frequency code systems, access restrictions, transmission systems, etc.

Inactive Publication Date: 2014-10-22
MEDIATEK SINGAPORE PTE LTD SINGAPORE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, conventional PSS designs are designed to operate at low frequency offsets

Method used

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  • Methods and apparatus for LTE cell search with large frequency offset
  • Methods and apparatus for LTE cell search with large frequency offset
  • Methods and apparatus for LTE cell search with large frequency offset

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Embodiment Construction

[0023] figure 1An exemplary block diagram of a wireless communication system is shown along with a cell search procedure and OFDM data frames carrying PSS and SSS signals. User equipment UE101 is within the range of a cell served by eNB102. The eNB 102 transmits the PSS in its downlink channel, which uses OFDMA. Each OFDM frame 111 is 10ms long. Each frame is divided into ten 1ms subframes. OFDM frame 111 contains 10 subframes as in frame 112 . The subframe is also divided into 0.5ms slots, which may contain seven OFDM symbols with a standard cyclic prefix (CP) length and six OFDM symbols with an extended cyclic prefix length. Subframe 1 in frame 112 has two 0.5 ms slots, with each slot having seven symbols as in 113 . Subframe 6 in frame 112 has two 0.5 ms slots with each slot having seven symbols as in 114 . In a frequency division duplex FDD (Frequency Division Duplex, FDD) cell, the PSS is located in the last (seventh) OFDM symbol of the first time slot of subframe 1...

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Abstract

Methods and devices for LTE cell search with large frequency offset are disclosed. In one embodiment of the invention, a UE divides the received signals into multiple frequency bins and transforms the signals into frequency domain through FFT. The UE performs correlating measures between the received signals and reference signals. The UE then performs an adaptive multi-try based peak selection such that the number of candidate is reduced. In one embodiment of the invention, the multi-try number is adaptively adjusted based on the channel condition. In one embodiment of the invention, the threshold of the peak selection is adaptively adjusted. In other embodiments of the invention, the UE performs non-coherent accumulation and selects a predefined number of coarse bin candidates. The number of non-coherent accumulation is adaptively adjusted. In another embodiment of the invention, the UE performs fractional frequency offset estimation and selects a fine bin candidate.

Description

【Technical field】 [0001] The present invention relates to a mobile communication network, in particular to a long term evolution technology (Long Term Evolution, hereinafter referred to as LTE) cell search with frequency offset. 【Background technique】 [0002] LTE is an improved universal mobile telecommunications system (UMTS) that provides higher data rates, lower latency, and improved system capacity. In order to provide a high data rate in a frequency selective fading environment, the downlink transmission utilizes Orthogonal Frequency Division Multiple Access (Orthogonal Frequency Division Multiple Access, hereinafter referred to as OFDMA) at the physical layer. However, one of the defects of OFDMA is the vulnerability (vulnerability) to carrier frequency offset (Carrier Frequency Offset, CFO). local oscillator ten millionths (10x10 -6 ) typical frequency drift (frequency drift) will cause a 25kHz offset. The LTE system adopts 15kHz fixed subcarrier spacing (subcarri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B1/7083H04W48/16
CPCH04B1/709H04B17/004H04B17/20H04B17/318H04J11/0073
Inventor 李俊强杨赣宁叶颜辉
Owner MEDIATEK SINGAPORE PTE LTD SINGAPORE
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