Granted Patent B2

US 12,659,999 · App. 17/630,493 · Granted Jun 16, 2026

Inventors: Qi Xiong (Beijing, CN); Feifei Sun (Beijing, CN); Bin Yu (Beijing, CN)

Assignee: Samsung Electronics Co., Ltd.

H04W74/0833H04W74/006H04L1/1812H04W74/0836H04W74/0838

Abstract

Claims (74)

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

receiving, from a base station, an uplink configuration information associated with a first message for a 2-step random access, wherein in case that the terminal is in an Radio Resource Control (RRC) connected state, the uplink configuration information is included in terminal specific RRC information and in case that the terminal is in an RRC Idle state or RRC Inactive state, the uplink configuration information is included in system information;

transmitting the first message comprising a Physical Random Access Channel (PRACH) preamble and a Physical Uplink Shared Channel (PUSCH) based on the uplink configuration information;

receiving a feedback message comprising a Random Access Response (RAR) as a response to the transmitted first message;

identifying whether the RAR is a fallback RAR or a success RAR;

in case that the RAR is the fallback RAR:

determining a transport block size for a PUSCH scheduled by the fallback RAR, wherein the transport block size for the PUSCH scheduled by the fallback RAR is same as a transport block size of the PUSCH included in the first message;

determining a modulation and coding scheme for the PUSCH scheduled by the fallback RAR; and

transmitting the PUSCH scheduled by the fallback RAR based on the determined transport block size and the determined modulation and coding scheme; and

in case that the RAR is the success RAR:

transmitting information related to Hybrid Automatic Repeat request-Acknowledgment, HARQ-ACK, feedback based on a Physical Uplink Control Channel (PUCCH) resource indicator included in the success RAR.

2 . The method of claim 1 , wherein the determining the transport block size for transmitting the PUSCH comprises:

identifying the transport block size indicated by the fallback RAR is different from the transport block size of the PUSCH included in the first message; and

determining the transport block size for transmitting the PUSCH based on a preset rule.

3 . The method of claim 2 , wherein the determining the transport block size for transmitting the PUSCH based on the preset rule comprises:

in case that the transport block size indicated by the fallback RAR is greater than the transport block size of the PUSCH included in the first message, performing zero-padding on the transport block of the PUSCH included in the first message and determining a size of the zero-padded transport block of the first message as the transport block size for transmitting the PUSCH; and

in case that the transport block size indicated by the fallback RAR is smaller than the transport block size of the first message, determining the transport block size of the PUSCH included in the first message as the transport block size for transmitting the PUSCH.

4 . The method of claim 1 , further comprising:

when in the RRC Idle state or the RRC Inactive state, receiving the system information including the uplink configuration information associated with the first message for the 2-step random access; and

wherein the transmitting the first message comprises transmitting the first message based on the uplink configuration information.

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

a memory;

a transceiver; and

at least one processor operably connected to the transceiver, the at least one processor configured to:

control the transceiver to receive, from a base station, an uplink configuration information associated with a first message for a 2-step random access, wherein in case that the terminal is in an Radio Resource Control (RRC) connected state, the uplink configuration information is included in terminal specific RRC information and in case that the terminal is in an RRC Idle state or RRC Inactive state, the uplink configuration information is included in system information message

control the transceiver to transmit the first message comprising a Physical Random Access Channel (PRACH) preamble and a Physical Uplink Shared Channel (PUSCH) based on the uplink configuration information;

control the transceiver to receive a feedback message comprising a Random Access Response (RAR) as a response to the transmitted first message,

identify whether the RAR is a fallback RAR or a success RAR,

in case that the RAR is the fallback RAR:

control the transceiver to determine a transport block size for a PUSCH scheduled by the fallback RAR, wherein the transport block size for the PUSCH scheduled by the fallback RAR is same as a transport block size of the PUSCH included in the first message,

control the transceiver to determine a modulation and coding scheme for the PUSCH scheduled by the fallback RAR, and

control the transceiver to transmit the PUSCH scheduled by the fallback RAR based on the determined transport block size and the determined modulation and coding scheme; and

in case that the RAR is the success RAR:

control the transceiver to transmit information related to Hybrid Automatic Repeat request-Acknowledgment, HARQ-ACK, feedback based on a Physical Uplink Control Channel (PUCCH) resource indicator included in the success RAR.

6 . The terminal of claim 5 , wherein the at least one processor is further configured to:

identify the transport block size indicated by the fallback RAR is different from the transport block size of the PUSCH included in the first message; and

determine the transport block size for transmitting the PUSCH based on a preset rule.

7 . The terminal of claim 5 , wherein the at least one processor is further configured to:

when in the RRC Idle state or the RRC Inactive state, receive the system information including the uplink configuration information associated with the first message for the 2-step random access, and

transmit the first message based on the uplink configuration information.

8 . A method, performed by a base station (BS), of receiving an uplink signal in a wireless communication system, the method comprising:

transmitting, to a terminal, an uplink configuration information associated with a first message for a 2-step random access, wherein in case that the terminal is in an Radio Resource Control (RRC) connected state, the uplink configuration information is included in terminal specific RRC information and in case that the terminal is in an RRC Idle state or RRC Inactive state, the uplink configuration information is included in system information;

receiving, from the terminal, the first message based on the first uplink configuration information;

identifying whether the first message comprises a Physical Random Access Channel (PRACH) preamble or a Physical Uplink Shared Channel (PUSCH);

in case that the first message comprises the PRACH preamble and does not comprise the PUSCH:

transmitting, to the terminal, a feedback message comprising a fallback Random Access Response (RAR); and

receiving a PUSCH based on a second transport block size and a modulation and coding scheme determined by a terminal,

wherein the second transport block size is the same as a first transport block size of the PUSCH included in the first message; and

in case that the first message comprises the PRACH preamble and the PUSCH:

transmitting, to the terminal, a feedback message comprising a success RAR; and

receiving, from the terminal, Hybrid Automatic Repeat reQuest-Acknowledgment (HARQ-ACK) feedback according to a Physical Uplink Control Channel (PUCCH) resource indicator included in the success RAR.

9 . The method of claim 8 , wherein the second transport block size is determined based on a preset rule when a transport block size indicated by the fallback RAR is different from the transport block size of the PUSCH included in the first message.

10 . The method of claim 8 , further comprising:

wherein in case that the terminal in the RRC Idle state or in the RRC Inactive state

transmitting, the system information including the uplink configuration information associated with the first message for the 2-step random access, and

wherein the receiving the first message comprises receiving the first message based on the uplink configuration information.

11 . A base station (BS) in a wireless communication system, the base station comprising:

a transceiver; and

at least one processor operably connected to the transceiver, the at least one processor configured to:

control the transceiver to transmit, to a terminal, an uplink configuration information associated with a first message for a 2-step random access, wherein in case that the terminal is in an Radio Resource Control (RRC) connected state, the uplink configuration information is included in terminal specific RRC information and in case that the terminal is in an RRC Idle state or RRC Inactive state, the uplink configuration information is included in system information,

control the transceiver to receive, from the terminal, the first message based on the uplink configuration information,

identify whether the first message comprises a Physical Random Access Channel (PRACH) preamble or Physical Uplink Shared Channel (PUSCH),

in case that the first message comprises the PRACH preamble and does not comprise the PUSCH,

transmit, to the terminal, a fallback Random Access Response (RAR); and

receive a PUSCH based on a second transport block size and a modulation and coding scheme determined by a terminal,

wherein the second transport block size is the same as a first transport block size of the PUSCH included in the first message; and

in case that the first message comprises the PRACH preamble and the PUSCH:

transmit, to the terminal, a feedback message comprising a success RAR; and

receive, from the terminal, Hybrid Automatic Repeat reQuest-Acknowledgment (HARQ-ACK) feedback according to a Physical Uplink Control Channel PUCCH) resource indicator included in the success RAR.

12 . The base station of claim 11 , wherein the second transport block size is determined based on a preset rule when a transport block size indicated by the fallback RAR is different from the transport block size of the PUSCH included in the first message.

13 . The base station of claim 11 , wherein the at least one processor is further configured to:

wherein in case that the terminal in the RRC Idle state or in the RRC Inactive state

control the transceiver to transmit the system information including the uplink configuration information associated with the first message for the 2-step random access, and

wherein the receiving the first message comprises receiving the first message based on the uplink configuration information.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (43)