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Random access method and device, storage medium, user terminal

A technology of random access and memory, applied in the field of communication, to achieve the effect of improving the effectiveness of communication

Active Publication Date: 2022-05-27
BEIJING SPREADTRUM HI TECH COMM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

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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) to notify the UE that random access needs to be re-initiated, and tell the 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 In the field of Frequency Domain Resource Assignment, when its field information is all 1, it indicates that DCI 1_0 is used for random access triggered by PDCCH Order.

[0027] More specifically, the DCI format 1_0 can 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...

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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, where the indication information is used to indicate that the random access is a 2-step random access Access or 4-step random access; initiate random access according to the control information. The solution of the present invention can trigger the UE to initiate random access in a more accurate manner by configuring appropriate control information, thereby improving communication effectiveness.

Description

technical field [0001] The present invention relates to the field of communication technologies, and in particular, to a random access method and device, a storage medium, and a user terminal. Background technique [0002] Two random access methods are supported in the New Radio (NR) system. One is competitive random access, in which the UE selects resources to send a preamble; the other is non-competitive random access, for example, through The Physical Downlink Control Channel Order (PDCCH Order) is triggered, and the base station (gNodeB, gNB) informs the user terminal (User Equipment, UE) through a special downlink control information (Downlink Control Information, DCI) format that it needs to re-initiate a 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, the NR is based on the DCI format 1_0 to send the PDCCH Order. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W74/00H04W74/08H04W72/04
CPCH04W74/006H04W74/008H04W74/0833H04W74/0866H04W72/23
Inventor 王化磊
Owner BEIJING SPREADTRUM HI TECH COMM TECH CO LTD
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