User equipment for random access and method thereof, base station for random access and method thereof

Patent metadata

Field	Value
Publication number	US-12167474-B2
Application number	US-202217573427-A
Country	US
Kind code	B2
Filing date	Jan 11, 2022
Priority date	Jan 12, 2021
Publication date	Dec 10, 2024
Grant date	Dec 10, 2024

Abstract

A random access method for a user equipment (UE) and apparatus thereof, and a random access method for a base station and apparatus thereof. The random access method for the user equipment (UE) comprises: acquiring random access resource configuration information; determining a subcarrier spacing of a random access preamble; determining a random access occasion (RO) according to the random access resource configuration information and the subcarrier spacing of the random access preamble; and transmitting the random access preamble on the determined RO.

First claim

What is claimed is:

1. A method performed by a user equipment (UE) in a wireless communication system, the method comprising:
receiving first information on a physical random access channel (PRACH) configuration index and second information indicating a subcarrier spacing for a random access preamble;
identifying a position related to the random access preamble in a time domain based on the first information and the subcarrier spacing for the random access preamble; and
transmitting the random access preamble based on the identified position,
wherein in case that the second information indicates one of 480 kHz and 960 kHz as the subcarrier spacing for the random access preamble, the position related to the random access preamble for one of 480 kHz and 960 kHz is identified based on a number of PRACH slots within a slot corresponding to 60 kHz, and
wherein the number of PRACH slots within the slot is identified by the PRACH configuration index.

2. The method of claim 1 , wherein the second information indicating the subcarrier spacing for the random access preamble is received via a higher layer signaling.

3. The method of claim 1 , further comprising:
determining one or more slot groups containing a random access resource corresponding to the position; and
determining a random access occasion (RO) according to the PRACH configuration index based on the one or more slot groups,
wherein the RO in each slot group is same.

4. The method of claim 3 , wherein the determining one or more slot groups containing the random access resource comprises at least one of:
determining one or more slot groups containing the random access resource according to an acquired bitmap indicating the one or more slot groups containing the random access resource;
determining one or more slot groups containing the random access resource by looking up a table according to an index indication, wherein the index indication is used to indicate the one or more slot groups containing the random access resource; or,
determining one or more slot groups containing the random access resource according to a position of a first slot group having the random access resource, a number of the one or more slot groups containing the random access resource, a position relationship and an deduction direction among the one or more slot groups containing the random access resource.

5. The method of claim 3 , wherein the determining the RO comprises:
acquiring an indication for a position of a duration T_rachduration occupied by a configured random access resource in a configured random access resource configuration period T_rachperiodicity;
determining the position of the T_rachduration in the T_rachperiodicity according to the acquired indication for the position; and
determining the RO according to the PRACH configuration index based on the position of the T_rachduration in the T_rachperiodicity.

6. The method of claim 5 , wherein the determining the position of the T_rachduration in the T_rachperiodicity according to the acquired indication for the position comprises:
determining the position of the T_rachduration in the T_rachperiodicity according to a configured N_rachduration_index, wherein the N_rachduration_index is a position index for the T_rachduration in one configured T_rachperiodicity.

7. A user equipment (UE), comprising:
at least processor; and
a memory storing instructions executable by the at least one processor,
wherein the at least one processor is configured to:
receive first information on a physical random access channel (PRACH) configuration index and second information indicating a subcarrier spacing for a random access preamble;
identify a position related to the random access preamble in a time domain based on the first information and the subcarrier spacing for the random access preamble; and
transmit the random access preamble based on the identified position,

wherein in case that the second information indicates one of 480 kHz and 960 kHz as the subcarrier spacing for the random access preamble, the position related to the random access preamble for one of 480 kHz and 960 kHz is identified based on a number of PRACH slots within a slot corresponding to 60 kHz, and
wherein the number of PRACH slots within the slot is identified by the PRACH configuration index.

8. The UE of claim 7 , wherein
the second information indicating the subcarrier spacing for the random access preamble is received via a higher layer signaling.

9. The UE of claim 7 , wherein the at least one processor is configured to:
determine one or more slot groups containing a random access resource corresponding to the position; and
determine a random access occasion (RO) according to the PRACH configuration index based on the one or more slot groups,
wherein the RO in each slot group is same.

10. The UE of claim 9 , wherein the at least one processor is configured to:
determine one or more slot groups containing the random access resource according to an acquired bitmap indicating the one or more slot groups containing the random access resource;
determine one or more slot groups containing the random access resource by looking up a table according to an index indication, wherein the index indication is used to indicate the one or more slot groups containing the random access resource; or,
determine one or more slot groups containing the random access resource according to a position of a first slot group having the random access resource, a number of the one or more slot groups containing the random access resource, a position relationship and an deduction direction among the one or more slot groups containing the random access resource.

11. The UE of claim 10 , wherein the at least one processor is configured to:
acquire an indication for a position of a duration T_rachduration occupied by a configured random access resource in a configured random access resource configuration period T_rachperiodicity;
determine the position of the T_rachduration in the T_rachperiodicity according to the acquired indication for the position; and
determine the RO according to the PRACH configuration index based on the position of the T_rachduration in the T_rachperiodicity.

12. The UE of claim 11 , wherein the at least one processor is configured to determine the position of the T_rachduration in the T_rachperiodicity according to a configured N_rachduration_index, wherein the N_rachduration_index is a position index for the T_rachduration in one configured T_rachperiodicity.

13. A method performed by a base station in a wireless communication system, the method comprising:
determining first information on a physical random access channel (PRACH) configuration index and second information indicating a subcarrier spacing for a random access preamble;
transmitting, to a user equipment (UE), the first information and the second information; and
receiving, from the UE, a random access preamble based on a position related to the random access preamble in a time domain,
wherein the position is associated with the first information and the subcarrier spacing for the random access preamble,
wherein in case that the second information indicates one of 480 kHz and 960 kHz as the subcarrier spacing for the random access preamble, the position related to the random access preamble for one of 480 kHz and 960 kHz is associated with a number of PRACH slots within a slot corresponding to 60 kHz, and
wherein the number of PRACH slots within the slot is associated with the PRACH configuration index.

14. The method of claim 13 ,
wherein the second information indicating

Assignees

• Samsung Electronics Co Ltd

Inventors

• Xiong Qi
• Wu Min
• Wang Yi

Classifications

• H04W74/0833 Primary

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

• H04W74/0838

  using contention-free random access [CFRA] · CPC title

• H04W74/0866

  using a dedicated channel for access · CPC title

• H04W72/0446

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

• H04L27/26025 Primary

  Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking (allocating sub-channels of the transmission path H04L5/003) · CPC title