A random access method and base station

Abstract

Embodiments of the present invention provide a random access method and a base station, which are used to realize random access of a terminal to a network. The method includes: the base station receives the random access preamble sent by the terminal; the base station obtains the random access preamble falling within each zero-correlation window of at least one zero-correlation window according to the received random access preamble and the pre-saved random access preamble set The parameters of the correlation peak, the random access preamble contained in the random access preamble set corresponds to the zero correlation window one by one, and the parameters of the correlation peak include the power and / or timing advance of the random access preamble; when at least one When the parameters of the correlation peaks in each zero-correlation window in the zero-correlation window have the parameters of the correlation peaks satisfying the preset condition, the base station sends a random access response message including the parameters of the correlation peak satisfying the preset condition to the terminal.

Description

Technical field [0001] The present invention relates to the field of communication technology, and more particularly to a random access method and a base station. Background technique [0002] Random access is the basic process of establishing a wireless link between the terminal and the network, and the terminal will be communicated with the base station after the end is completed. [0003] During the random access, the terminal determines the timing of random access preamle, preamle, and sends random access preams to the base station to the base station based on the configuration parameters issued by the base station. The access preamble is from the random access preamble (ZADOFF-CHU) sequence. After receiving the random access preamble, the base station receives the random access preamble, according to the respective zadoff-chu sequences in the zero-related window according to the respective Zadoff-CHU sequences in the set of random access preamble collections in the random ac...

AI Technical Summary

Problems solved by technology

[0004] In the existing random access technical solutions, because the terminal sends the random access preamble to the base station in advance or later, it may cause the correlation peak obtained by the base station to fall in the wrong zero-correlation window, or because the base station receives The energy leakage of the random access preamble will cause the correlation peaks obtained by the base station to fall in multiple zero-correlation windows, both of which may cause the base station to determine the identity of the wrong random access preamble and the wrong parameters, so that the terminal cannot perform uplink synchronization according to the random access response sent by the base station. At this time, the random access response sent by the base station is an invalid random access response, which in turn causes the random access time to be prolonged and the random access failure rate to be high.

The base station may misjudge the interference noise as a random access preamble, and send a random access response based on the misjudged random access preamble. At this time, the random access response sent by the base station is an invalid random access response, wasting resources of the base station, which slows down the operation of the base station

[0005] To sum up, the existing random access technical solutions have problems such as extended random access time, high random access failure rate, waste of base station resources, and slow operation speed. Therefore, it is urgent to design a technical solution for random access of terminals to the network.

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