Random access detection device and detection method in TD-LTE (Time Division-Long Term Evolution) system

Abstract

The invention discloses a random access detection device and a detection method in a TD-LTE (Time Division-Long Term Evolution) system. The device comprises a data extraction unit, a Fourier transform unit, a spectrum shifting unit, a local root sequence generating unit, a relative detection unit and a threshold detection unit, wherein the data extraction unit is used for extracting base band data; the Fourier transform unit is used for carrying out discrete Fourier transform on extracted data to obtain a frequency domain signal; the spectrum shifting unit is used for carrying out spectrum shifting on the frequency domain signal to obtain a frequency domain signal after the spectrum shifting; the local root sequence generating unit is used for generating N1 local frequency domain root sequences according to a logical root number broadcasted in broadcast information; the relative detection unit is used for carrying out relative frequency domain detection on the frequency domain signal after the spectrum shifting and the local frequency domain root sequences to obtain N1 time domain relative values; and the threshold detection unit is used for detecting and judging the time domain relative values according to a set threshold value, judging whether a terminal is allowed to be accessed into the system or not and calculating timing advance. The device and the method can be used for quickly detecting a random access precursor in the TD-LTE system, thereby greatly reducing the computation complexity and improving the operation efficiency.

Description

technical field [0001] The invention relates to the technical field of TD-LTE mobile communication, in particular to a random access detection device and detection method in a TD-LTE system. Background technique [0002] In the TD-SCDMA Long Term Evolution (TD-LTE) system, a user terminal (User Equipment, UE) can be scheduled for uplink transmission only after the uplink transmission time synchronization is completed. During the initial synchronization process The UE implements uplink synchronization by sending a preamble on a physical random access channel (Physical Random Access Channel, PRACH). This process is generally called a random access process. Specifically, the random access process of the UE can be divided into the following steps: first, the UE confirms the system frame number and subframe number for sending the PRACH starting from the system frame number and subframe number determined in the downlink synchronization process, and at the determined time point Ra...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: how to quickly detect the random access preamble in the TD-LTE system, reduce the computational complexity, and improve the operational efficiency

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