Granted Patent B2

US 12,439,468 · App. 18/501,475 · Granted Oct 7, 2025

Inventors: Sangyeob Jung (Suwon-si, KR); Sangbum Kim (Suwon-si, KR)

Assignee: Samsung Electronics Co., Ltd.

H04W76/18H04W74/0833

Abstract

Claims (40)

1. An operation method of a terminal in a wireless communication system, the method comprising:

attempting to transmit a preamble in a random access procedure by performing a listen-before-talk (LBT) via an unlicensed spectrum;

generating a random access report based on the attempting to transmit the preamble; and

transmitting, to a base station, the random access report,

wherein the random access report includes perRAInfoListLBT, and

wherein a random access information included in the perRAInfoListLBT includes information on random access failure due to LBT failure.

2. The method of claim 1 ,

wherein the random access report comprises a number of one or more failures of the attempting to transmit the preamble, and

wherein a counter for the number is incremented by 1, in response to a failure of the attempting to transmit the preamble according to the LBT failure being detected.

3. The method of claim 1 , further comprising:

determining a consistent LBT failure based on a counter exceeding a predetermined value;

stopping the random access procedure;

generating information on a BWP where the consistent LBT failure is determined based on a consistent LBT failure being determined; and

performing a new random access procedure by switching to a new bandwidth part (BWP).

4. The method of claim 3 ,

wherein the information on the BWP where the consistent LBT failure is determined is included in the random access report.

5. The method of claim 4 , wherein the information on the BWP where the consistent LBT failure is determined includes at least one of location and BWP information, or subcarrier spacing.

6. The method of claim 1 , further comprising:

based on detecting a radio link failure (RLF), transmitting, to the base station, the random access report.

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

a transceiver; and

a controller operably connected to the transceiver and being configured to:

attempt to transmit a preamble in a random access procedure by performing a listen-before-talk (LBT) via an unlicensed spectrum,

generate a random access report based on the attempt to transmit the preamble, and

transmit, to a base station, the random access report,

wherein the random access report includes perRAInfoListLBT, and

wherein a per random access information included in the perRAInfoListLBT includes information on random access failure due to LBT failure.

8. The terminal of claim 7 ,

wherein the random access report comprises a number of one or more failures of the attempting to transmit the preamble, and

wherein a counter for the number is incremented by 1, in response to a failure of the attempt to transmit the preamble according to the LBT failure being detected.

9. The terminal of claim 7 , wherein the controller is further configured to:

determine a consistent LBT failure, in case that a counter exceeds a predetermined value,

stop the random access procedure,

generate information on a BWP where the consistent LBT failure is determined, in case that a consistent LBT failure is determined, and

perform a new random access procedure by switching to a new bandwidth part (BWP).

10. The terminal of claim 9 ,

wherein the information on the BWP where the consistent LBT failure is determined is included in the random access report.

11. The terminal of claim 10 , wherein the information on the BWP where the consistent LBT failure is determined includes at least one of location and BWP information, or subcarrier spacing.

12. The terminal of claim 7 , wherein the controller is further configured to:

in case that a radio link failure (RLF) is detected, transmit, to the base station, the random access report.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (16)