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Detection method for accidental precursor access

A technology of random access preamble and detection method, applied in the direction of digital transmission system, electrical components, modulation carrier system, etc., can solve the problem of insufficient accuracy of uplink timing adjustment information, high data processing complexity, low access success rate, etc. problems, to achieve the effect of reducing the difficulty of data processing, reducing signaling overhead, and eliminating timing errors

Active Publication Date: 2008-10-29
ZTE CORP
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Problems solved by technology

[0018] To sum up, in the existing LTE system, when the mobile terminal completes the uplink synchronization through the RACH channel to access the system, there are problems such as low access success rate or high false alarm rate caused by the inability to quickly and accurately estimate the noise power, The complexity of data processing is relatively high, and there are defects such as high false alarm rate caused by the use of oversampling technology and insufficient accuracy of the obtained uplink timing adjustment information

Method used

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  • Detection method for accidental precursor access
  • Detection method for accidental precursor access
  • Detection method for accidental precursor access

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Embodiment Construction

[0043] The method of the present invention will be further described in detail below in conjunction with the drawings and the embodiments of the present invention.

[0044] In the LTE standard, it is stipulated that the bandwidth occupied by the RACH signal in the frequency domain is 1.08MHz, and the interval of each RACH subcarrier is stipulated to be 1.25KHz. In this way, there are a total of 864 RACH subcarriers in this bandwidth range, of which 839 subcarriers are used for RACH data and the remaining 25 subcarriers are used as guard bands. The LTE standard also stipulates that the time domain format of the RACH signal is: a cyclic prefix (CP, Cycle Prefix) is followed by a RACH preamble, and the RACH preamble is followed by a guard interval. Among them, no signal is sent during the guard interval.

[0045] According to the measured false alarm rate, the target is 10 -3 For the relative detection threshold at time, take the RACH signal with a sampling frequency of 30.72MHz as a...

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Abstract

The invention discloses a method for detecting a random access leader. After a random access channel (RACH) signal is treated with the simplified time domain-related operation, noise mean estimation is carried out to each root sequence; an absolute threshold is then detected according to a signal obtained by the noise estimation and signals in a search window are detected; the signals which exceed the detection threshold are screened and then a timing position can be determined in a fast and accurate way so as to provide reliable uplink timing adjustment information to a mobile terminal, guarantee the accuracy of the uplink synchronization and effectively eliminate the timing error due to the over-sampling and reduce the false alarm in the detection.

Description

Technical field [0001] The present invention relates to an access signal detection technology in the field of mobile communication, in particular to a detection method of random access preamble. Background technique [0002] In the Long Term Evolution (LTE, Long Term Evolution) system, after the mobile terminal is turned on, the mobile terminal first performs downlink synchronization through the Synchronization Channel (SCH) to find the receiving start point and cell ID of the radio frame and subframe; and then detect The broadcast channel (BCH, Broadcast Channel) obtains system information, including the configuration information of a random access channel (RACH, Random Access Channel); finally, uplink synchronization is performed through the RACH channel to complete the work of accessing the system. [0003] In the process of mobile terminal uplink synchronization, first find the position of the RACH channel based on the reception starting point of the radio frame and subframe ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707
CPCH04L27/2656H04L27/2662H04W74/0866
Inventor 薛妍翟羽佳谭欢喜
Owner ZTE CORP
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