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Random access method and device, storage medium and user terminal

A technology of random access and storage, applied in the field of communication, to achieve the effect of improving user experience

Active Publication Date: 2020-06-16
BEIJING SPREADTRUM HI TECH COMM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, for random access triggered by PDCCH order, the NR R15 protocol only supports 4-step random access (4-step Random Access Channel, 4-step RACH). However, it is clear that NR R16 requires In the case of supporting 2-step RACH, there is currently no solution to trigger 2-step RACH

Method used

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  • Random access method and device, storage medium and user terminal
  • Random access method and device, storage medium and user terminal
  • Random access method and device, storage medium and user terminal

Examples

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Embodiment Construction

[0025] In the existing non-contention random access technology, NR can send PDCCH Order based on control information (such as DCI format 1_0), notify UE that random access needs to be re-initiated, and tell UE the preamble index and PRACH mask index that should be used .

[0026] Specifically, NR can send PDCCH Order based on DCI format 1_0, that is, the length is the same as DCI format 1_0, scrambled with C-RNTI, and some fields in format 1_0 are reused to indicate random access information, such as using frequency domain resources Assignment (Frequency Domain Resource Assignment) field, when its field information is all 1, it means that DCI 1_0 is used for random access triggered by PDCCH Order.

[0027] More specifically, the DCI format 1_0 may be configured to include the following information for random access:

[0028] The identifier of the DCI format (Identifier for DCI formats), which is indicated by 1 bit, is used to indicate that the current DCI format is DCI1_0;

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Abstract

A random access method and device, a storage medium and a user terminal, the method comprising: receiving control information, and determining indication information according to the control information, the indication information being used for indicating that random access is two-step random access or four-step random access; and initiating random access according to the control information. According to the scheme of the invention, the UE can be triggered to initiate random access in a more accurate manner by configuring proper control information, and the communication effectiveness is improved.

Description

technical field [0001] The present invention relates to the technical field of communications, and in particular to a random access method and device, a storage medium, and a user terminal. Background technique [0002] The New Radio (NR) system supports two random access methods, one is contention random access, UE selects resources to send the preamble (Preamble); the other is non-contention random access, for example, through When the Physical Downlink Control Channel Order (PDCCH Order) is triggered, the base station (gNodeB, gNB) notifies the user terminal (User Equipment, UE) through a special downlink control information (Downlink Control Information, DCI) format that it needs to re-initiate the random Access, and tell the UE the preamble index (Preamble Index) and physical random access channel (Physical Random Access Channel, PRACH) mask index (Mask Index) that should be used. Specifically, NR sends the PDCCH Order based on DCI format 1_0. [0003] In the prior ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/00H04W74/08H04W72/04
CPCH04W74/006H04W74/0833H04W74/0866H04W72/23H04W74/002
Inventor 王化磊
Owner BEIJING SPREADTRUM HI TECH COMM TECH CO LTD
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