Method and device for configuring precursor

Abstract

A method and a device of preamble configuration. The method includes acquiring the identification information of preambles corresponding to a cell. The preambles corresponding to the cell include contention preambles and non-contention preambles. The non-contention preambles include useful non-contention preambles and useless non-contention preambles. According to the identification information, the corresponding contention preambles and useful non-contention preambles are confirmed. The reference root sequence information for creating the contention preambles and the useful non-contention preambles are obtained. According to the reference root sequence information, reference root sequences are generated. The method and device can only obtain the reference root sequence information that generates the contention preambles and the useful non-contention preambles, and thereby generate the reference root sequences only related to the contention preambles and the useful non-contention preambles. The method and device avoid detecting the root sequences of all preambles supported by the cell after receiving a preamble signal. The method and device save resources, reduce detection time delay, and thereby reduce the terminal connecting time delay and switching time delay.

Description

technical field [0001] The present invention relates to the field of communication technologies, in particular to a preamble configuration method and device. Background technique [0002] In an evolved packet system (Evolved Packet System, EPS for short) network, an initial asynchronous random access process is part of a terminal device (User Equipment, UE for short) accessing a cell or performing cell handover. The asynchronous random access signal is usually carried in a random burst, and the content of the random burst is a physical random access channel (Physical Random Access CHannel) preamble (Preamble). The PRACH preamble is a time-domain signal that occupies a certain bandwidth and is generated by a cyclically shifted sequence using a specific root sequence. The number of root sequences used by different cells may be different, and each cell needs to support 64 PRACH preambles. By performing correlation detection on the root sequence that generates the preamble, the...

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Problems solved by technology

[0003] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: in the existing asynchronous random access process, when the base station receives a PRACH preamble, all the preambles supported by the cell under the base station Correlation detection is performed on the root sequence of the root sequence, which leads to waste of resources and increases the detection delay, thereby increasing the UE's access delay and handover delay

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