MSG3 transmission method and apparatus, device, and storage medium

Patent metadata

Field	Value
Publication number	US-12470325-B2
Application number	US-202318352405-A
Country	US
Kind code	B2
Filing date	Jul 14, 2023
Priority date	Jan 15, 2021
Publication date	Nov 11, 2025
Grant date	Nov 11, 2025

Abstract

Embodiments of this application provide an Msg3 transmission method and apparatus, a device, and a storage medium. The method includes: receiving, by a terminal device, Msg3 repetition indication information transmitted by a network device, and determining a configuration parameter for Msg3 repetition; and performing Msg3 repetition according to the Msg3 repetition indication information.

First claim

What is claimed is:

1 . A message Msg3 transmission method, comprising:
receiving, by a terminal device, Msg3 repetition indication information transmitted by a network device, and determining a configuration parameter for Msg3 repetition; and performing Msg3 repetition according to the Msg3 repetition indication information, wherein the Msg3 repetition indication information is comprised in a system information block (SIB), and the SIB comprises: a first threshold value TO of signal strength/signal quality/path loss; a second threshold value T1; and a set of numbers of Msg3 repetitions, before the performing Msg3 repetition according to the Msg3 repetition indication information, the method further comprises: in a case that a first condition is met, selecting, by the terminal device, a parameter corresponding to a synchronization signal block (SSB) with signal quality greater than the first threshold value TO as a configuration parameter of a first Msg1; wherein the configuration parameter is a time-frequency resource configuration parameter for an Msg1 preamble subsequent set and random access channel (RACH) occasion, which are obtained based on a combination of a selected SSB number with an Msg1-related parameter corresponding to the Msg3 repetition.

2 . The Msg3 transmission method according to claim 1 , wherein the Msg3 repetition indication information is further comprised in at least one of the following:
random access response (RAR) information; downlink control information (DCI) scrambled by a temporary cell radio network temporary identifier (TC-RNTI).

3 . The Msg3 transmission method according to claim 1 , before the performing Msg3 repetition according to the Msg3 repetition indication information, further comprising:
receiving the SSB and the SIB that are transmitted by the network device; and determining, based on the SSB and the SIB, whether to request an Msg3 repetition operation from the network device.

4 . The Msg3 transmission method according to claim 1 , wherein the first condition comprises:
the terminal device detecting that signal quality of all SSBs is lower than the second threshold value T1, wherein the second threshold value is a threshold value for SSB selection in a 4-step random access procedure specified in a protocol, or the second threshold value is a threshold value notified through a system message.

5 . The Msg3 transmission method according to claim 2 , wherein the RAR information comprises at least one of the following:
number of Msg3 repetitions; an inter-slot hopping enable field for Msg3 repetition.

6 . The Msg3 transmission method according to claim 2 , wherein the DCI scrambled by the temporary cell radio network temporary identifier (TC-RNTI) comprises at least one of the following:
number of Msg3 repetitions; a hopping pattern for Msg3 repetition.

7 . The Msg3 transmission method according to claim 1 , wherein the RAR information comprises an modulation and coding scheme (MCS) field, and the MCS field contains MCS configuration information and the number of Msg3 repetitions.

8 . The Msg3 transmission method according to claim 1 , wherein the SIB further comprises: an Msg1-related parameter corresponding to Msg3 repetition, and the Msg1-related parameter corresponding to Msg3 repetition comprises at least one of the following:
a set of candidate physical random access channel (PRACH) preambles; and a time-frequency resource and periodicity for Msg1 transmission.

9 . A terminal device, comprising a processor, a memory, and a program or instructions stored in the memory and capable of running on the processor, wherein when the program or instructions are executed by the processor, the processor is configured to implement the following steps:
receiving Msg3 repetition indication information transmitted by a network device, and determining a configuration parameter for Msg3 repetition; and performing Msg3 repetition according to the Msg3 repetition indication information, wherein the Msg3 repetition indication information is comprised in a system information block (SIB) and the SIB comprises: a first threshold value TO of signal strength/signal quality/path loss; a second threshold value T1; and a set of numbers of Msg3 repetitions, the processor is further configured to implement the following steps: before the performing Msg3 repetition according to the Msg3 repetition indication information, in a case that a first condition is met, selecting a parameter corresponding to a synchronization signal block (SSB) with signal quality greater than the first threshold value TO as a configuration parameter of a first Msg1; wherein the configuration parameter is a time-frequency resource configuration parameter for an Msg1 preamble subsequent set and random access channel (RACH) occasion, which are obtained based on a combination of a selected SSB number with an Msg1-related parameter corresponding to the Msg3 repetition.

10 . The terminal device according to claim 9 , wherein the Msg3 repetition indication information is further comprised in at least one of the following:
random access response (RAR) information; downlink control information (DCI) scrambled by a temporary cell radio network temporary identifier (TC-RNTI).

11 . The terminal device according to claim 9 , wherein the processor is further configured to:
receive the SSB and the system information block that are transmitted by the network device; and determine, based on the SSB and the system information block, whether to request an Msg3 repetition operation from the network device.

12 . A non-transitory computer-readable storage medium, configured to store a program, wherein the program, when executed, causes a processor to implement steps of the method according to claim 1 .

13 . The terminal device according to claim 9 , wherein the first condition comprises:
the terminal device detecting that signal quality of all SSBs is lower than the second threshold value T1, wherein the second threshold value is a threshold value for SSB selection in a 4-step random access procedure specified in a protocol, or the second threshold value is a threshold value notified through a system message.

14 . The terminal device according to claim 10 , wherein the RAR information comprises at least one of the following:
number of Msg3 repetitions; an inter-slot hopping enable field for Msg3 repetition.

15 . The terminal device according to claim 10 , wherein the DCI scrambled by the temporary cell radio network temporary identifier (TC-RNTI) comprises at least one of the following:
number of Msg3 repetitions; a hopping pattern for Msg3 repetition.

16 . The terminal device according to claim 10 , wherein the RAR information comprises an modulation and coding scheme (MCS) field, and the MCS field contains MCS configuration information and the number of Msg3 repetitions.

17 . The terminal device according to claim 9 , wherein the SIB further comprises: an Msg1-related parameter corresponding to Msg3 repetition, and the Msg1-related parameter corresponding to Msg3 repetition comprises at least one of the following:
a set of candidate physical random access channel (PRACH) preambles; and a time-frequency resource and periodicity for Msg1 transmission.

18 . The non-transitory computer-readable storage medium according to claim 12 , wherein the Msg3 repetition indication information is further comprised in at least one of the following:
random access response (RAR) information; downlink control

Assignees

• Vivo Mobile Communication Co Ltd

Inventors

• Yang Kun
• Wu Kai
• Pan Xueming
• Li Na

Classifications

• H04W74/0833

  Random access procedures, e.g. with 4-step access · CPC title

• H04L1/1812

  Hybrid protocols; Hybrid automatic repeat request [HARQ] · CPC title

• H04W74/006

  in the downlink, i.e. towards the terminal · CPC title

• H04L1/08 Primary

  by repeating transmission, e.g. Verdan system {(H04L1/1858 and H04L1/189 take precedence)} · CPC title

• H04L1/1893

  Physical mapping arrangements (physical resource mapping in general H04L5/00) · CPC title