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Random access method and terminal

A random access and random access preamble technology, applied in the field of communication, can solve the problems that the base station cannot be accurately estimated and cannot be successfully accessed, so as to achieve the effect of increasing coverage and improving the probability of success

Active Publication Date: 2019-03-05
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is to say, the base station can only accurately calculate the TA of terminals within a small range. For the majority of terminals outside the coverage area of ​​the base station's service cell, the base station cannot accurately estimate the TA of these terminals, which leads to these terminals randomly receiving In the entry stage, the TA issued by the base station cannot be successfully accessed

Method used

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  • Random access method and terminal
  • Random access method and terminal
  • Random access method and terminal

Examples

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Embodiment Construction

[0063] The technical solutions in the embodiments of the present invention will be described in detail below with reference to the drawings in the embodiments of the present invention.

[0064] Such as figure 1 As shown, when multiple terminals all have the requirement to send data to the base station, collisions will occur between different terminals. Therefore, a random access technology is proposed to avoid conflicts between terminals by controlling the time when different terminals send uplink data.

[0065] Specifically, the base station broadcasts system information, and the system information includes time-frequency information of uplink PRACH, root sequence index number, and cyclic shift (cyclic shift) and so on. The terminal detects the synchronization sequence and completes downlink synchronization. Further, the terminal may also send a random access preamble (Random Access Preamble on RACH in uplink) to the base station according to the system message broadcast by...

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Abstract

The embodiment of the invention provides a random access method and a terminal, and relates to the field of communications, so as to adjust a TA (Timing Advance) of the terminal and increase a coverage range of a base station under the conditions of a high frequency and a large subcarrier spacing. The method comprises the following steps that: the terminal receives a first uplink TA sent by the base station, and sends first uplink data to the base station according to the first TA; the terminal receives a receiving failure response sent by the base station, and updates the first TA to second TA, wherein the second TA is greater than the first TA, and the receiving failure response is used to indicate that the base station does not successfully receive the first uplink data; and the terminal sends second uplink data to the base station according to the second TA.

Description

technical field [0001] The embodiments of the present invention relate to the communication field, and in particular, to a random access method and a terminal. Background technique [0002] When the number of terminals is large, different terminals simultaneously requesting access to the base station will cause collisions between terminals, and the random access technology can well solve the collisions between users. Specifically, the base station broadcasts system information, and each terminal receives the system information and determines a preamble (preamble) according to the system information. Subsequently, the terminal sends a preamble to the base station through a physical random access channel (PRACH), and the base station measures the uplink timing advance (timing advance, TA) of the terminal according to the preamble sent by the terminal, and then sends the TA to the terminal. The terminal determines the start time of uplink transmission according to the receive...

Claims

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Application Information

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IPC IPC(8): H04W74/00H04W74/08
CPCH04W74/004H04W74/085H04W74/00H04W74/08
Inventor 曹永照赵毅男吴凤娟胡小群张鹏周国华
Owner HUAWEI TECH CO LTD
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