# US 2022/0279596 A1 · Method and apparatus for selecting random access preamble group and identifying rnti in wireless communication system

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2022/0279596 A1
- Document ID: US20220279596A1
- Status: Published application
- Kind: A1
- Application number: 17/677,554
- Filed: 2022-02-22
- Published: 2022-09-01
- Earliest claimed: 2021-02-24
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Anil AGIWAL; Jaehyuk JANG
- Web page: https://patentgrep.com/patent/US20220279596A1

## CPC

- H04L 27/2666: {Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length}
- H04W 74/0841: {with collision treatment}
- H04L 27/26025: {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)}
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04W 74/0866: {using a dedicated channel for access}
- H04W 74/0836: with 2-step access
- H04W 74/0838: using contention-free random access [CFRA]
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## 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

### Claim 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 including information on a subcarrier spacing for a random access preamble;
transmitting, to the base station, the random access preamble for a random access procedure in a PRACH occasion by using the subcarrier spacing;
identifying a radio network temporary identifier (RNTI) for the random access procedure based on the subcarrier spacing used for the random access preamble; and
monitoring a physical downlink control channel (PDCCH) addressed to the RNTI in a random access response window,
wherein the RNTI for the random access procedure is identified by using a parameter s_id which is an index of a first orthogonal frequency division multiplexing (OFDM) symbol of the PRACH occasion, a parameter t_id which is an index of a first slot of the PRACH occasion in a system frame, a parameter f_id which is an index of the PRACH occasion in a frequency domain, and a parameter ul_carrier_id which is an uplink carrier used for the random access preamble, and
wherein, in case that the subcarrier spacing used for transmitting the random access preamble is larger than 120 kHz, the parameter t_id is identified based on an assumption that the subcarrier spacing for the random access preamble is 120 kHz and the system frame includes 80 slots.

### Claim 2 (depends on 1)

The method of claim 1, wherein the subcarrier spacing for the random access preamble is 480 kHz or 960 kHz.

### Claim 3 (depends on 1)

The method of claim 1, wherein, in case that the subcarrier spacing used for transmitting the random access preamble is smaller than or equal to 120 kHz, the parameter t_id is identified based on a value of the information.

### Claim 4 (depends on 1)

The method of claim 1, wherein, in case that the random access procedure is a 4-step random access procedure, the RNTI which is a random access RNTI (RA-RNTI) is identified by:
the RA-RNTI=1+s_id+14*t_id+14*80*f_id+14*80*8*ul_carrier_id.

### Claim 5 (depends on 1)

The method of claim 1, wherein, in case that the random access procedure is a 2-step random access procedure, the RNTI which is a message B RNTI (MSGB-RNTI) is identified by:
the MSGB-RNTI=1+s_id+14*t_id+14*80*f_id+14*80*8*ul_carrier_id+14*80*8*2.

### Claim 6

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 including information on a subcarrier spacing for a random access preamble;
receiving, from the terminal, the random access preamble for a random access procedure in a PRACH occasion by using the subcarrier spacing;
identifying a radio network temporary identifier (RNTI) for the random access procedure based on the subcarrier spacing used for the random access preamble; and
transmitting, to the terminal, a physical downlink control channel (PDCCH) addressed to the RNTI in a random access response window,
wherein the RNTI for the random access procedure is identified by using a parameter s_id which is an index of a first orthogonal frequency division multiplexing (OFDM) symbol of the PRACH occasion, a parameter t_id which is an index of a first slot of the PRACH occasion in a system frame, a parameter f_id which is an index of the PRACH occasion in a frequency domain, and a parameter ul_carrier_id which is an uplink carrier used for the random access preamble, and
wherein, in case that the subcarrier spacing used for transmitting the random access preamble is larger than 120 kHz, the parameter t_id is identified based on an assumption that the subcarrier spacing for the random access preamble is 120 kHz and the system frame includes 80 slots.

### Claim 7 (depends on 6)

The method of claim 6, wherein the subcarrier spacing for the random access preamble is 480 kHz or 960 kHz.

### Claim 8 (depends on 6)

The method of claim 6, wherein, in case that the subcarrier spacing used for transmitting the random access preamble is smaller than or equal to 120 kHz, the parameter t_id is identified based on a value of the information.

### Claim 9 (depends on 6)

The method of claim 6, wherein, in case that the random access procedure is a 4-step random access procedure, the RNTI which is a random access RNTI (RA-RNTI) is identified by:
the RA-RNTI=1+s_id+14*t_id+14*80*f_id+14*80*8*ul_carrier_id.

### Claim 10 (depends on 6)

The method of claim 6, wherein, in case that the random access procedure is a 2-step random access procedure, the RNTI which is a message B RNTI (MSGB-RNTI) is identified by:
the MSGB-RNTI=1+s_id+14*t_id+14*80*f_id+14*80*8*ul_carrier_id+14*80*8*2.

### Claim 11

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 including information on a subcarrier spacing for a random access preamble,
transmit, to the base station, the random access preamble for a random access procedure in a PRACH occasion by using the subcarrier spacing,
identify a radio network temporary identifier (RNTI) for the random access procedure based on the subcarrier spacing used for the random access preamble, and
monitor a physical downlink control channel (PDCCH) addressed to the RNTI in a random access response window,
wherein the RNTI for the random access procedure is identified by using a parameter s_id which is an index of a first orthogonal frequency division multiplexing (OFDM) symbol of the PRACH occasion, a parameter t_id which is an index of a first slot of the PRACH occasion in a system frame, a parameter f_id which is an index of the PRACH occasion in a frequency domain, and a parameter ul_carrier_id which is an uplink carrier used for the random access preamble, and
wherein, in case that the subcarrier spacing used for transmitting the random access preamble is larger than 120 kHz, the parameter t_id is identified based on an assumption that the subcarrier spacing for the random access preamble is 120 kHz and the system frame includes 80 slots.

### Claim 12 (depends on 11)

The terminal of claim 11, wherein the subcarrier spacing for the random access preamble is 480 kHz or 960 kHz.

### Claim 13 (depends on 11)

The terminal of claim 11, wherein, in case that the subcarrier spacing used for transmitting the random access preamble is smaller than or equal to 120 kHz, the parameter t_id is identified based on a value of the information.

### Claim 14 (depends on 11)

The terminal of claim 11, wherein, in case that the random access procedure is a 4-step random access procedure, the RNTI which is a random access RNTI (RA-RNTI) is identified by:
the RA-RNTI=1+s_id+14*t_id+14*80*f_id+14*80*8*ul_carrier_id.

### Claim 15 (depends on 11)

The terminal of claim 11, wherein, in case that the random access procedure is a 2-step random access procedure, the RNTI which is a message B RNTI (MSGB-RNTI) is identified by:
the MSGB-RNTI=1+s_id+14*t_id+14*80*f_id+14*80*8*ul_carrier_id+14*80*8*2.

### Claim 16

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 including information on a subcarrier spacing for a random access preamble,
receive, from the terminal, the random access preamble for a random access procedure in a PRACH occasion by using the subcarrier spacing,
identify a radio network temporary identifier (RNTI) for the random access procedure based on the subcarrier spacing used for the random access preamble, and
transmit, to the terminal, a physical downlink control channel (PDCCH) addressed to the RNTI in a random access response window,
wherein the RNTI for the random access procedure is identified by using a parameter s_id which is an index of a first orthogonal frequency division multiplexing (OFDM) symbol of the PRACH occasion, a parameter t_id which is an index of a first slot of the PRACH occasion in a system frame, a parameter f_id which is an index of the PRACH occasion in a frequency domain, and a parameter ul_carrier_id which is an uplink carrier used for the random access preamble, and
wherein, in case that the subcarrier spacing used for transmitting the random access preamble is larger than 120 kHz, the parameter t_id is identified based on an assumption that the subcarrier spacing for the random access preamble is 120 kHz and the system frame includes 80 slots.

### Claim 17 (depends on 16)

The base station of claim 16, wherein the subcarrier spacing for the random access preamble is 480 kHz or 960 kHz.

### Claim 18 (depends on 16)

The base station of claim 16, wherein, in case that the subcarrier spacing used for transmitting the random access preamble is smaller than or equal to 120 kHz, the parameter t_id is identified based on a value of the information.

### Claim 19 (depends on 16)

The base station of claim 16, wherein, in case that the random access procedure is a 4-step random access procedure, the RNTI which is a random access RNTI (RA-RNTI) is identified by:
the RA-RNTI=1+s_id+14*t_id+14*80*f_id+14*80*8*ul_carrier_id.

### Claim 20 (depends on 16)

The base station of claim 16, wherein, in case that the random access procedure is a 2-step random access procedure, the RNTI which is a message B RNTI (MSGB-RNTI) is identified by:
the MSGB-RNTI=1+s_id+14*t_id+14*80*f_id+14*80*8*ul_carrier_id+14*80*8*2.