IP Library › Granted Patent US 12713469

Granted Patent B2

US 12713469 · App. 17/677,554 · Granted Aug 18, 2026

Method and apparatus for selecting random access preamble group and identifying RNTI in wireless communication system

Inventors: Anil Agiwal (Suwon-si, KR); Jaehyuk Jang (Suwon-si, KR)

Assignee: Samsung Electronics Co., Ltd.

H04W74/0841 H04L27/26025 H04W72/0446 H04W72/0453 H04W74/0833 H04W74/0866 H04W74/0836 H04W74/0838

View Patent ↗

Loading inventors, assignments & file history…

Monitor This Case

Get email alerts when status or documents change.

Order Certified Copies

Most orders are placed with the USPTO same day — all within 24 business hours.

Order via The Patent Place →

Pre-filled with this patent's details

Quick Facts

Patent No.: US 12713469
App. No.: 17/677,554
Filed: Feb 22, 2022
Granted: Aug 18, 2026
Kind: B2
Examiner: YUEN, KAN
Art Unit: 2464
USPC: 370/329

External Links

USPTO Patent Center↗ Full Patent PDF↗

Abstract

The disclosure relates to a 5th generation (5G) communication system or a 6th generation (6G) communication system for supporting higher data rates beyond a 4th generation (4G) communication system such as long term evolution (LTE). A method and an apparatus for selecting random access group and identifying radio network temporary identifier (RNTI) for random access procedure in next generation wireless communication system are provided.

Claims (60)

1 . A method performed by a terminal in a wireless communication system, the method comprising:

receiving, from a base station, physical random access channel (PRACH) configuration information;

transmitting, to the base station, a random access preamble for a random access procedure in a PRACH occasion; and

monitoring a physical downlink control channel (PDCCH) addressed to a radio network temporary identifier (RNTI) in a random access response window,

wherein the RNTI is identified based on an index of a first slot of the PRACH occasion in a system frame in which the random access preamble is transmitted,

wherein, in case that a subcarrier spacing is 15 kHz, 30 kHz, 60 kHz, or 120 kHz, the index of the first slot of the PRACH occasion in the system frame is determined based on the subcarrier spacing, and

wherein, in case that a subcarrier spacing is 480 kHz or 960 kHz, the index of the first slot of the PRACH occasion in the system frame is determined based on an index of a slot for a subcarrier spacing of 120 kHz, where the index of the first slot of the PRACH occasion in the system frame is equal to or larger than 0 and less than 80.

2 . The method of claim 1 , wherein a number of slots in the system frame is 80 for the subcarrier spacing of 120 kHz, and the index of the slot for the subcarrier spacing of 120 kHz is numbered in the system frame from 0 to 79.

3 . The method of claim 1 , wherein, in case that the random access procedure is a 4-step random access procedure, the RNTI is a random access RNTI (RA-RNTI) and is identified by:

RA-RNTI=1 +s _id+14 *t _id+14*80 *f _id+14*80*8*ul_carrier_id,

where s_id is an index of a first orthogonal frequency division multiplexing (OFDM) symbol of the PRACH occasion, t_id is the index of the first slot of the PRACH occasion in the system frame, f_id is an index of the PRACH occasion in a frequency domain, and ul_carrier_id indicates an uplink carrier used for the random access preamble.

4 . The method of claim 1 , wherein, in case that the random access procedure is a 2-step random access procedure, the RNTI is a message B RNTI (MSGB-RNTI) and is identified by:

MSGB-RNTI=1 +s _id+14 *t _id+14*80 *f _id+14*80*8*ul_carrier_id+14*80*8*2,

5 . A method performed by a base station in a wireless communication system, the method comprising:

transmitting, to a terminal, physical random access channel (PRACH) configuration information;

receiving, from the terminal, a random access preamble for a random access procedure in a PRACH occasion; and

transmitting, to the terminal, a physical downlink control channel (PDCCH) addressed to a radio network temporary identifier (RNTI) in a random access response window,

wherein the RNTI is identified based on an index of a first slot of the PRACH occasion in a system frame in which the random access preamble is received,

6 . The method of claim 5 , wherein a number of slots in the system frame is 80 for the subcarrier spacing of 120 kHz, and the index of the slot for the subcarrier spacing of 120 kHz is numbered in the system frame from 0 to 79.

7 . The method of claim 5 , wherein, in case that the random access procedure is a 4-step random access procedure, the RNTI is a random access RNTI (RA-RNTI) and is identified by:

RA-RNTI=1 +s _id+14 *t _id+14*80 *f _id+14*80*8*ul_carrier_id,

8 . The method of claim 5 , wherein, in case that the random access procedure is a 2-step random access procedure, the RNTI is a message B RNTI (MSGB-RNTI) and is identified by:

MSGB-RNTI=1 +s _id+14 *t _id+14*80 *f _id+14*80*8*ul_carrier_id+14*80*8*2,

9 . A terminal in a wireless communication system, the terminal comprising:

a transceiver configured to transmit or receive a signal; and

a controller coupled with the transceiver and configured to:

receive, from a base station, physical random access channel (PRACH) configuration information,

transmit, to the base station, a random access preamble for a random access procedure in a PRACH occasion, and

monitor a physical downlink control channel (PDCCH) addressed to a radio network temporary identifier (RNTI) in a random access response window,

wherein the RNTI is identified based on an index of a first slot of the PRACH occasion in a system frame in which the random access preamble is transmitted,

10 . The terminal of claim 9 , wherein a number of slots in the system frame is 80 for the subcarrier spacing of 120 kHz, and the index of the slot for the subcarrier spacing of 120 kHz is numbered in the system frame from 0 to 79.

11 . The terminal of claim 9 , wherein, in case that the random access procedure is a 4-step random access procedure, the RNTI is a random access RNTI (RA-RNTI) and is identified by:

RA-RNTI=1 +s _id+14 *t _id+14*80 *f _id+14*80*8*ul_carrier_id,

12 . The terminal of claim 9 , wherein, in case that the random access procedure is a 2-step random access procedure, the RNTI is a message B RNTI (MSGB-RNTI) and is identified by:

MSGB-RNTI=1 +s _id+14 *t _id+14*80 *f _id+14*80*8*ul_carrier_id+14*80*8*2,

13 . A base station in a wireless communication system, the base station comprising:

a transceiver configured to transmit or receive a signal; and

a controller coupled with the transceiver and configured to:

transmit, to a terminal, physical random access channel (PRACH) configuration information,

receive, from the terminal, a random access preamble for a random access procedure in a PRACH occasion, and

transmit, to the terminal, a physical downlink control channel (PDCCH) addressed to a radio network temporary identifier (RNTI) in a random access response window,

wherein the RNTI is identified based on an index of a first slot of the PRACH occasion in a system frame in which the random access preamble is received,

14 . The base station of claim 13 , wherein a number of slots in the system frame is 80 for the subcarrier spacing of 120 kHz, and the index of the slot for the subcarrier spacing of 120 kHz is numbered in the system frame from 0 to 79.

15 . The base station of claim 13 , wherein, in case that the random access procedure is a 4-step random access procedure, the RNTI is a random access RNTI (RA-RNTI) and is identified by:

RA-RNTI=1 +s _id+14 *t _id+14*80 *f _id+14*80*8*ul_carrier_id,

16 . The base station of claim 13 , wherein, in case that the random access procedure is a 2-step random access procedure, the RNTI is a message B RNTI (MSGB-RNTI) and is identified by:

MSGB-RNTI=1 +s _id+14 *t _id+14*80 *f _id+14*80*8*ul_carrier_id+14*80*8*2,