Granted Patent B2

US 12,452,932 · App. 18/304,970 · Granted Oct 21, 2025

Inventors: Seunghoon Park (Seoul, KR); Jungmin Moon (Suwon-si, KR)

Assignee: Samsung Electronics Co., Ltd.

H04W74/0841H04W72/0446H04W74/006H04W74/0833H04W16/14H04W74/0838

Abstract

Claims (52)

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

performing a measurement of a plurality of synchronization signals transmitted from a base station;

identifying that a measurement result of at least one synchronization signal among the plurality of synchronization signals is greater than a threshold value based on the measurement;

selecting a first synchronization signal among the at least one synchronization signal whose measurement result is greater than the threshold value and transmitted from the base station;

identifying a resource mapped to an index of the selected first synchronization signal, the resource being identified for transmitting a random access preamble; and

transmitting, to the base station, the random access preamble on the identified resource based on the selected first synchronization signal.

2. The method of claim 1 , wherein indexes of at least one synchronization signal are mapped to at least one resource for transmitting a random access preamble.

3. The method of claim 1 , further comprising:

monitoring a random access response based on a random access response window;

identifying that the random access response is not received within the random access response window;

determining to retransmit, to the base station, at least one random access preamble in case that the random access response is not received within the random access response window;

identifying whether a transmission beam for a retransmission is changed;

determining to suspend a power ramping counter in case that the transmission beam for the retransmission is changed; and

retransmitting, to the base station, at least one random access preamble, based on the suspended power ramping counter.

4. The method of claim 3 , further comprising:

determining to increment a power ramping counter by a predetermined value, in case that the transmission beam for the retransmission is not changed.

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

transmitting, to a terminal, a plurality of synchronization signals;

receiving, from the terminal, a random access preamble based on a resource, wherein a measurement result of at least one synchronization signal among the plurality of synchronization signals is greater than a predetermined threshold value, wherein a first synchronization signal is selected among the at least one synchronization signal whose measurement result is greater than the predetermined threshold value and transmitted from the base station, and wherein the resource is mapped to an index of the selected first synchronization signal, and wherein the resource is for transmitting a random access preamble; and

transmitting, to the terminal, a random access response as a response to receiving the random access preamble, wherein the random access preamble is transmitted on the resource mapped to the index of the selected first synchronization signal.

6. The method of claim 5 , wherein indexes of at least one synchronization signal are mapped to at least one resource for transmitting a random access preamble.

7. The method of claim 5 , further comprising:

in case that the random access response is monitored based on a random access response window, that the random access response is not received within the random access response window is identified, a retransmission is determined, and to suspend a power ramping counter is determined based on a transmission beam for the retransmission being changed, receiving, from the terminal, at least one random access preamble which is retransmitted based on the suspended power ramping counter.

8. The method of claim 7 , wherein to increment a power ramping counter by a predetermined value is determined, in case that the transmission beam for the retransmission is not changed.

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

a transceiver; and

at least one processor configured to:

perform a measurement of a plurality of synchronization signals transmitted from a base station,

identify that a measurement result of at least one synchronization signal among the plurality of synchronization signals is greater than a threshold value based on the measurement,

select a first synchronization signal among the at least one synchronization signal whose measurement result is greater than the threshold value and transmitted from the base station,

identify a resource mapped to an index of the selected first synchronization signal, the resource being identified for transmitting a random access preamble, and

transmit, to the base station via the transceiver, the random access preamble on the identified resource based on the selected first synchronization signal.

10. The terminal of claim 9 , wherein indexes of at least one synchronization signal are mapped to at least one resource for transmitting a random access preamble.

11. The terminal of claim 9 , wherein the at least one processor is further configured to:

monitor a random access response based on a random access response window,

identify that the random access response is not received within the random access response window,

determine to retransmit, to the base station, at least one random access preamble in case that the random access response is not received within the random access response window,

identify whether a transmission beam for a retransmission is changed,

determine to suspend a power ramping counter in case that the transmission beam for the retransmission is changed, and

retransmit, to the base station via the transceiver, at least one random access preamble, based on the suspended power ramping counter.

12. The terminal of claim 11 , wherein the at least one processor is further configured to:

determine to increment a power ramping counter by a predetermined value, in case that the transmission beam for the retransmission is not changed.

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

a transceiver; and

at least one processor configured to:

transmit, to a terminal via the transceiver, a plurality of synchronization signals,

receive, from the terminal via the transceiver, a random access preamble based on a resource, wherein a measurement result of at least one synchronization signal among the plurality of synchronization signals is greater than a predetermined threshold value, wherein a first synchronization signal is selected among the at least one synchronization signal whose measurement result is greater than the predetermined threshold value and transmitted, and wherein the resource is mapped to an index of the selected first synchronization signal, and wherein the resource is for transmitting a random access preamble, and

transmit, to the terminal via the transceiver, a random access response as a response to receiving the random access preamble, wherein the random access preamble is transmitted on the resource mapped to the index of the selected first synchronization signal.

14. The base station of claim 13 , wherein indexes of at least one synchronization signal are mapped to at least one resource for transmitting a random access preamble.

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

in case that the random access response is monitored based on a random access response window, that the random access response is not received within the random access response window is identified, a retransmission is determined, and to suspend a power ramping counter is determined based on a transmission beam for the retransmission being changed, receive, from the terminal via the transceiver, at least one random access preamble which is retransmitted based on the suspended power ramping counter.

16. The base station of claim 15 , wherein to increment a power ramping counter by a predetermined value is determined, in case that the transmission beam for the retransmission is not changed.

Priority Claims (1)

Continuity (5)

References Cited (49)