Granted Patent B2

US 12,483,974 · App. 17/880,619 · Granted Nov 25, 2025

Inventor: Soenghun Kim (Hanam-si, KR)

Assignee: BLACKPIN INC.

H04W48/16H04L5/0048H04W74/0833

Abstract

Claims (81)

1 . A method performed by a terminal, the method comprising:

receiving in a first cell, from a base station, a System Information Block1 (SIB1) comprising a ServingCellConfigCommon;

determining if the first cell is barred based on a cellBarred in Master Information Block (MIB) and presence of a second intraFreqReselection in the SIB1;

transmitting a random access preamble in the first cell; and

monitoring a first Radio Network Temporary Identity (RNTI)

wherein the random access preamble is transmitted based on a second msg1-FrequencyStart in case that:

the second msg1-FrequencyStart is present in the ServingCellConfigCommon;

the cellBarred indicates notBarred; and

the second intraFreqReselection is present in the SIB1,

wherein the random access preamble is transmitted based on a first msg1-FrequencyStart in case that:

the second msg1-FrequencyStart is absent in the ServingCellConfigCommon;

the cellBarred indicates notBarred; and

the second intraFreqReselection is present in the SIB1,

wherein the terminal monitors the first RNTI based on a third searchSpaceZero in case that:

a second ra-SearchSpace is present in the ServingCellConfigCommon; and

the second ra-SearchSpace indicates zero,

wherein the terminal monitors the first RNTI based on a second searchSpaceZero in case that:

the second ra-SearchSpace is absent in the ServingCellConfigCommon; and

a first ra-SearchSpace indicates zero,

wherein:

configuration of a first searchSpaceZero is indicated in the MIB;

configuration of the second searchSpaceZero is indicated in the SIB1; and

configuration of the third searchSpaceZero is indicated in the SIB1.

2 . The method of claim 1 ,

wherein the monitoring the first RNTI is performed during a random access response window.

3 . The method of claim 2 ,

wherein length of the random access response window is determined based on a second ra-ResponseWindow in case that the second ra-ResponseWindow is present in the ServingCellConfigCommon.

4 . The method of claim 3 ,

wherein length of the random access response window is determined based on a first ra-ResponseWindow in case that the second ra-ResponseWindow is absent in the ServingCellConfigCommon.

5 . The method of claim 1 ,

wherein, in case that a second configuration index is present in the ServingCellConfigCommon, time resource for the random access preamble is determined based on:

the second configuration index; and

a parameter indicating reference subcarrier spacing.

6 . The method of claim 5 ,

wherein, in case that a second configuration index is absent in the ServingCellConfigCommon, time resource for the random access preamble is determined based on:

a first configuration index; and

the parameter indicating reference subcarrier spacing.

7 . The method of claim 1 ,

wherein retransmission of the random access preamble is determined based on a second preambleTransMax in case that the second preambleTransMax is present in the ServingCellConfigCommon.

8 . The method of claim 7 ,

wherein retransmission of the random access preamble is determined based on a first preambleTransMax in case that the second preambleTransMax is absent in the ServingCellConfigCommon.

9 . The method of claim 1 ,

wherein the random access preamble is transmitted further based on:

a parameter for subcarrier spacing of preamble; and

a threshold for reference signal received power.

10 . The method of claim 9 ,

wherein the servingCellConfigCommon comprises:

a single instance of the parameter for subcarrier spacing of preamble; and

two instances of the threshold for reference signal received power.

11 . The method of claim 1 , wherein:

a first intraFreqReselection is mandatorily present in MIB; and

the second intraFreqReselection is optionally present in SIB1.

12 . The method of claim 1 ,

wherein the random access preamble is selected based on a second rsrp-ThresholdSSB in case that the second rsrp-ThresholdSSB is present in the ServingCellConfigCommon.

13 . The method of claim 1 ,

wherein the random access preamble is selected based on a first rsrp-ThresholdSSB in case that a second rsrp-ThresholdSSB is absent in the ServingCellConfigCommon.

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

a transceiver configured to transmit and receive a signal; and

a controller configured to control the transceiver to:

receive in a first cell a System Information Block1 (SIB1) comprising a ServingCellConfigCommon;

determine if the first cell is barred based on a cellBarred in Master Information Block (MIB) and presence of a second intraFreqReselection in the SIB1;

transmit a random access preamble or reselecting a second cell, and

monitor a first Radio Network Temporary Identity (RNTI),

wherein the random access preamble is transmitted based on a second msg1-FrequencyStart in case that:

the second msg1-FrequencyStart is present in the ServingCellConfigCommon;

the cellBarred indicates notBarred; and

the second intraFreqReselection is present in the SIB1,

wherein the random access preamble is transmitted based on a first msg1-FrequencyStart in case that:

the second msg1-FrequencyStart is absent in the ServingCellConfigCommon;

the cellBarred indicates notBarred; and

the second intraFreqReselection is present in the SIB1,

wherein the terminal monitors the first RNTI based on a third searchSpaceZero in case that:

a second ra-SearchSpace is present in the ServingCellConfigCommon; and

the second ra-SearchSpace indicates zero,

wherein the terminal monitors the first RNTI based on a second searchSpaceZero in case that:

the second ra-SearchSpace is absent in the ServingCellConfigCommon; and

a first ra-SearchSpace indicates zero,

wherein:

configuration of a first searchSpaceZero is indicated in the MIB;

configuration of the second searchSpaceZero is indicated in the SIB1; and

configuration of the third searchSpaceZero is indicated in the SIB1.

Assignments (2)

Priority Claims (1)

Continuity (1)

References Cited (11)