Random access method using Zadoff-Chu (ZC) sequence as preamble, apparatus and system thereof

Abstract

The invention provides a random access method using a Zadoff-Chu (ZC) sequence as a preamble. The method comprises the following steps that: A. a base station uses a root parameter u to generate the ZC sequence with a length of NZC, wherein n is greater than or equal to 0 and less than or equal to NZC-1; B. the base station selects the parameter v according to a cell position, wherein the v is greater than or equal to 0 and less than or equal to N-1, the parameter v of the adjacent cell is not the same and N is a number of a cyclic shift sequence; C. the base station of the cell v calculates a cycle shift amount of the cell, wherein N<shift>CS is the initial position of the cyclic shift and NCS is cyclic shift interval amount; D. the base station of the cell v issues the cyclic shift amount of the cell to a terminal of the cell; E. the terminal initiates the random access after setting the initial position of the terminal itself ZC sequence which is taken as the random access preamble according to the received cyclic shift amount. The invention also provides a random access realization apparatus using the ZC sequence as the preamble and a system thereof.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a random access technology of a wireless channel, in particular to a random access method, device and system using a ZC sequence as a preamble. Background technique [0002] A random access channel (RACH, Radom Access Channel) is an uplink channel, which plays a very important role in a wireless communication system, and a user equipment (UE, User Equipment) accesses the system through the random access channel. In the design process of random access, interference should be avoided as much as possible to obtain higher detection performance. [0003] In the Long Term Evolution (LTE, Long Term Evolution) system, RACH uses the cyclic shift sequence of Zadoff-Chu (ZC) sequence as the preamble (Preamble), and these cyclic shift sequences can also be called zero correlation zone (ZCZ, Zero Correlation Zone). [0004] For a communication system using the ZC sequ...

AI Technical Summary

Problems solved by technology

However, in a resource-constrained system, the codeword length of the ZC sequence cannot be designed very long. At this time, its spreading gain is small and the detection signal-to-noise ratio is relatively large. If ZC sequences with different root parameters are used as multiplexing codes character set, which will cause great interference to the random access channel of users in each cell

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