Ultra-high-speed random access processing method, device and system

Abstract

The present invention discloses a method, an apparatus and a system for processing very-high-speed random access, where the method includes: selecting a ZC sequence group according to a cell type and a first cyclic shift parameter Ncs, and setting N detection windows for each ZC sequence in the ZC sequence group, where N‰¥5; sending the cell type, a second Ncs, and the ZC sequence group to a user equipment UE, so that the UE selects a random access sequence from the ZC sequence group; receiving a random access signal sent by the UE, and obtaining the random access sequence from the random access signal; and performing correlation processing on the random access sequence with each ZC sequence in the ZC sequence group, detecting a valid peak value in the N detection windows of each ZC sequence, and determining an estimated value of a round trip delay RTD according to the valid peak value. A problem that it is difficult to detect a round trip delay correctly in a very-high-speed scenario is solved, so that a user equipment in a very-high-speed scenario can normally access a network, thereby improving network access performance.

Description

technical field [0001] The present invention relates to a mobile communication system, in particular to an ultra-high-speed random access processing method, device and system. Background technique [0002] In a Long Term Evolution (LTE) system, a Random Access Channel (Random Access Channel, RACH) is mainly used for initial access of a User Equipment (User Equipment, UE), and it does not carry any user data. The signal sent by the UE on the RACH channel is a preamble (Preamble) sequence, and the preamble sequence is a Zadoff-Chu sequence (Zadoff-Chu sequence, ZC sequence). In the prior art, Preamble can include a length T CP Cyclic Prefix (CP) and a length of T SEQ The access sequence (Sequence, SEQ) has two parts. At the same time, for the parameter settings of Preamble in several different formats, different cell radii can be matched, as shown in Table 1: [0003] Table 1 [0004] [0005] Among them, T s is the basic time unit in the LTE protocol, T s =1 / (15000×...

AI Technical Summary

Problems solved by technology

In the above two scenarios, the frequency offset of the random access signal is relatively large, as W ≥ 5, it is difficult for eNB to ensure the correctness of RTD detection under large frequency offset, so it is difficult to ensure the normal access of UE to the network, which affects the access performance of the network

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