Random access signal transmission method and terminal

Patent metadata

Field	Value
Publication number	US-12588065-B2
Application number	US-202217987794-A
Country	US
Kind code	B2
Filing date	Nov 15, 2022
Priority date	May 15, 2020
Publication date	Mar 24, 2026
Grant date	Mar 24, 2026

Abstract

A random access signal transmission method, a terminal, and a non-transitory computer-readable storage medium are provided. The random access signal transmission method includes: determining a target time range according to a time domain position of a target downlink signal within a fixed frame period; and determining a Random Access Channel (RACH) occasion intersected with the target time range within the fixed frame period as an invalid RACH occasion according to configuration information of the fixed frame period and configuration information of the RACH occasion.

First claim

What is claimed is:

1 . A random access signal transmission method, performed by a terminal, comprising:
determining a target time range according to a time domain position of a target downlink signal within a fixed frame period; and determining a Random Access Channel (RACH) occasion intersected with the target time range within the fixed frame period as an invalid RACH occasion according to configuration information of the fixed frame period and configuration information of the RACH occasion, wherein the target downlink signal comprises at least one of the following:
a Physical Downlink Control Channel (PDCCH), or
a first downlink detection signal transmitted within initial Y resource elements of the fixed frame period configured with the RACH occasion, wherein the resource element is a symbol or a slot, and Y is a positive integer number.

2 . The random access signal transmission method according to claim 1 , wherein after the determining a target time range according to a time domain position of a target downlink signal within a fixed frame period, the method further comprises:
determining a RACH occasion not intersected with the target time range within the fixed frame period as a valid RACH occasion; and mapping the valid RACH occasion with a synchronization signal and Physical Broadcast Channel (PBCH) block (SSB).

3 . The random access signal transmission method according to claim 1 , wherein the target downlink signal further comprises a synchronization signal and Physical Broadcast Channel (PBCH) block (SSB).

4 . The random access signal transmission method according to claim 3 , wherein the target time range is at least one of the following:
a first time range being from an initiation time of the fixed frame period to a start time or an end time of a control resource set in which a first PDCCH configured within the fixed frame period is located; a second time range being from the initiation time of the fixed frame period to a start time or an end time of a first SSB configured within the fixed frame period; a third time range being X resource elements after the start time or X resource elements after the end time of the control resource set in which the first PDCCH configured within the fixed frame period is located from the initiation time of the fixed frame period; a fourth time range being X resource elements after the start time or X resource elements after the end time of the first SSB configured within the fixed frame period from the initiation time of the fixed frame period; a fifth time range being initial X resource elements of the fixed frame period; or an intersection or a union of any two or more of the first time range, the second time range, the third time range, the fourth time range, or the fifth time range, wherein the resource element is a symbol or a slot, wherein X is a positive integer number.

5 . The random access signal transmission method according to claim 4 , wherein X is predefined, configured according to system information, or configured by Radio Resource Control (RRC).

6 . The random access signal transmission method according to claim 3 , further comprising:
determining that all RACH occasions within the fixed frame period are invalid RACH occasions when the target downlink signal does not exist within the fixed frame period.

7 . The random access signal transmission method according to claim 1 , wherein the PDCCH comprises one or more of the following: a Type 0 PDCCH, a Type 0A PDCCH, a Type 1 PDCCH, a Type 2 PDCCH, or a Type 3 PDCCH.

8 . The random access signal transmission method according to claim 1 , wherein before the determining a target time range according to a time domain position of a target downlink signal within a fixed frame period, the method further comprises:
determining the fixed frame period configured with the RACH occasion according to the configuration information of the fixed frame period and the configuration information of the RACH occasion; and determining the initial Y resource elements of the fixed frame period configured with the RACH occasion as a time domain position of the first downlink detection signal.

9 . The random access signal transmission method according to claim 1 , wherein Y is predefined, configured according to system information, or configured by Radio Resource Control (RRC).

10 . The random access signal transmission method according to claim 1 , wherein the target time range is at least one of the following:
a time occupied by the first downlink detection signal within the fixed frame period; or X resource elements after a start time or X resource elements after an end time of the first downlink detection signal from an initiation time of the fixed frame period, wherein the resource element is a symbol or a slot, wherein X is a positive integer number.

11 . The random access signal transmission method according to claim 1 , wherein the first downlink detection signal comprises at least one of the following:
a group common PDCCH or a common PDCCH; a Type 0 PDCCH, a Type 0A PDCCH, a Type 1 PDCCH, a Type 2 PDCCH, or a Type 3 PDCCH; or a predefined sequence.

12 . The random access signal transmission method according to claim 11 , wherein the predefined sequence is one of the following: a primary synchronization signal, a secondary synchronization signal, a channel state information reference signal, or a wideband-dedicated demodulation reference signal.

13 . The random access signal transmission method according to claim 1 , wherein the first downlink detection signal does not carry any information or carries information related to a random access channel.

14 . The random access signal transmission method according to claim 1 , wherein the target downlink signal further comprises a downlink signal on an initial Bandwidth Part (BWP) or a BWP comprising the initial BWP.

15 . The random access signal transmission method according to claim 1 , wherein the random access signal comprises a random access pilot or a Physical Uplink Shared Channel (PUSCH) in MsgA in a 2-step random access procedure.

16 . A terminal, comprising: a memory having a computer program stored thereon; and a processor, wherein the computer program, when executed by the processor, causes the processor to perform a random access signal transmission method, comprising:
determining a target time range according to a time domain position of a target downlink signal within a fixed frame period; and determining a Random Access Channel (RACH) occasion intersected with the target time range within the fixed frame period as an invalid RACH occasion according to configuration information of the fixed frame period and configuration information of the RACH occasion, wherein the target downlink signal comprises at least one of the following:
a Physical Downlink Control Channel (PDCCH), or
a first downlink detection signal transmitted within initial Y resource elements of the fixed frame period configured with the RACH occasion, wherein the resource element is a symbol or a slot, and Y is a positive integer number.

17 . The terminal according to claim 16 , wherein after the determining a target time range according to a time domain position of a target downlink signal within a fixed frame period, the random access signal transmission method further comprises:
determining a RACH occasion not intersected with the target time range within the fixed frame period as a valid RACH occasion; and mapping the valid RACH occasion with a synchronization signal and Physical Broadc

Assignees

• Vivo Mobile Communication Co Ltd

Inventors

• Li Gen

Classifications

• H04W74/0836

  with 2-step access · CPC title

• H04W74/006 Primary

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

• H04W74/0833 Primary

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

• H04W74/0808

  using carrier sensing, e.g. carrier sense multiple access [CSMA] · CPC title

• H04W74/002 Primary

  Transmission of channel access control information · CPC title