Method for transmitting random access message and device

Patent metadata

Field	Value
Publication number	US-12439456-B2
Application number	US-202117389475-A
Country	US
Kind code	B2
Filing date	Jul 30, 2021
Priority date	Feb 1, 2019
Publication date	Oct 7, 2025
Grant date	Oct 7, 2025

Abstract

A method for transmitting a random access message and a device are provided. The method includes: determining a valid transmission occasion from transmission occasions of a random access message, where the random access message corresponds to at least one of physical random access channel (PRACH) or physical uplink shared channel (PUSCH); and transmitting the random access message on the valid transmission occasion.

First claim

What is claimed is:

1. A method for transmitting a random access message, executed by a terminal device and comprising:
determining a valid transmission occasion from transmission occasions of a random access message, wherein the random access message corresponds to at least one of physical random access channel (PRACH) or physical uplink shared channel (PUSCH); and
transmitting the random access message on the valid transmission occasion;
wherein the transmission occasion corresponds to a PRACH transmission occasion and a PUSCH transmission occasion;
wherein the determining a valid transmission occasion from transmission occasions of a random access message comprises:
determining the valid transmission occasion from the transmission occasions of the random access message based on a slot format indicated in first configuration information, or a slot format indicated in second configuration information, wherein
the first configuration information comprises cell-specific time division duplex (TDD) configuration information; and
the second configuration information comprises UE-specific TDD configuration information;
wherein the determining a valid transmission occasion from transmission occasions of a random access message comprises:
when a transmission occasion of the random access message meets the following preset conditions, determining that the transmission occasion is a valid transmission occasion, wherein
the preset conditions comprise:
in one slot, the transmission occasion does not precede an SSB occasion;
a time gap between the transmission occasion and a first preset occasion is greater than or equal to a first preset value, wherein the first preset occasion is a time domain location of a latest downlink symbol before the transmission occasion; and
a time gap between the transmission occasion and a second preset occasion is greater than or equal to a first preset value, wherein the second preset occasion is a latest SSB occasion before the transmission occasion.

2. The method according to claim 1 , wherein the determining a valid transmission occasion from transmission occasions of a random access message comprises:
if a transmission occasion of the random access message is located in an uplink symbol indicated by first configuration information, determining that the transmission occasion is a valid transmission occasion, wherein
the first configuration information comprises cell-specific TDD configuration information.

3. The method according to claim 1 , wherein when the transmission occasion of the random access message meets the preset conditions, determining that the transmission occasion is a valid transmission occasion comprises:
if the transmission occasion of the random access message is located in an uplink symbol or a flexible symbol indicated by second configuration information and meets at least one of the preset conditions, determining that the transmission occasion is a valid transmission occasion, wherein
the second configuration information comprises UE-specific TDD configuration information.

4. The method according to claim 1 , wherein the determining a valid transmission occasion from transmission occasions of a random access message further comprises:
if the terminal device works in an unlicensed band and a transmission occasion of the random access message falls within a discovery reference signal (DRS) time window, determining that the transmission occasion is an invalid transmission occasion.

5. The method according to claim 1 , wherein the determining a valid transmission occasion from transmission occasions of a random access message comprises:
if the terminal device works in an unlicensed band and preset conditions are met, determining that a transmission occasion of the random access message is a valid transmission occasion, wherein
the preset conditions comprise:
in one slot, the transmission occasion of the random access message does not precede a third preset occasion; and
a time gap between the transmission occasion of the random access message and the third preset occasion is greater than or equal to a second preset value; wherein
the third preset occasion comprises a candidate SSB or DRS occasion.

6. The method according to claim 1 , wherein the determining a valid transmission occasion from transmission occasions of a random access message comprises:
if the terminal device works in an unlicensed band and preset conditions are met, determining that a transmission occasion of the random access message is a valid transmission occasion, wherein
the preset conditions comprise:
in one slot, the transmission occasion of the random access message does not precede a fourth preset occasion; and
a time gap between the transmission occasion of the random access message and the fourth preset occasion is greater than or equal to a second preset value; wherein
the fourth preset occasion comprises an actual SSB or DRS occasion.

7. A terminal device, comprising a memory, a processor, and a program stored in the memory and capable of running on the processor, wherein when the program is executed by the processor, the following steps are implemented:
determining a valid transmission occasion from transmission occasions of a random access message, wherein the random access message corresponds to at least one of physical random access channel (PRACH) or physical uplink shared channel (PUSCH); and
transmitting the random access message on the valid transmission occasion;
wherein the transmission occasion corresponds to a PRACH transmission occasion and a PUSCH transmission occasion;
wherein the determining a valid transmission occasion from transmission occasions of a random access message comprises:
determining the valid transmission occasion from the transmission occasions of the random access message based on a slot format indicated in first configuration information, or a slot format indicated in second configuration information, wherein
the first configuration information comprises cell-specific time division duplex (TDD) configuration information; and
the second configuration information comprises UE-specific TDD configuration information;
wherein the determining a valid transmission occasion from transmission occasions of a random access message comprises:
when a transmission occasion of the random access message meets the following preset conditions, determining that the transmission occasion is a valid transmission occasion, wherein
the preset conditions comprise:
in one slot, the transmission occasion does not precede an SSB occasion;
a time gap between the transmission occasion and a first preset occasion is greater than or equal to a first preset value, wherein the first preset occasion is a time domain location of a latest downlink symbol before the transmission occasion; and
a time gap between the transmission occasion and a second preset occasion is greater than or equal to a first preset value, wherein the second preset occasion is a latest SSB occasion before the transmission occasion.

8. The terminal device according to claim 7 , wherein the determining a valid transmission occasion from transmission occasions of a random access message comprises:
determining the valid transmission occasion from the transmission occasions of the random access message based on at least one of a slot format indicated in first configuration information, a slot format indicated in second configuration information, or a synchronization signal block (SSB) occasion, wherein
the first configuration information comprises cell-specific time division duplex (TDD) configuration information; and
the second configuration information comprises UE-specific TDD configuration information.

Assignees

• Vivo Mobile Communication Co Ltd

Inventors

• Chen Xiaohang
• Shen Xiaodong

Classifications

• H04W74/0833 Primary

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

• H04W74/0836

  with 2-step access · CPC title

• H04W56/001

  Synchronization between nodes · CPC title

• H04L5/1469

  using time-sharing · CPC title

• H04W72/0446

  Resources in time domain, e.g. slots or frames · CPC title