Granted Patent B2

US 12,666,321 · App. 18/604,378 · Granted Jun 23, 2026

Inventor: Soenghun Kim (Hanam-si, KR)

Assignees: BLACKPIN INC.; Soenghun Kim

H04W36/0072H04W36/08

Abstract

Claims (44)

1 . A method performed by a user device, the method comprising:

transmitting, to a base station, capability information associated with the user device;

receiving, from the base station, a first radio resource control (RRC) message, wherein the first RRC message comprises:

at least one configuration parameter associated with a serving cell; and

at least one configuration parameter associated with layer-1/layer-2 triggered mobility (LTM);

receiving, from the base station, a specific downlink control information (DCI) associated with a physical downlink control channel (PDCCH) order, wherein the specific DCI comprises:

a first field comprising a value associated with the PDCCH order;

a second field comprising a value indicating an identifier of an LTM candidate cell;

a third field comprising a value related to power ramping counter; and

a fourth field comprising a value indicating an index of random access preamble;

determining, in case that the value related to power ramping counter in the third field of the specific DCIis set to a first value, to ramp up a preamble transmission power for a random access preamble transmission to the LTM candidate cell; and

based on the index of random access preamble, transmitting, to the LTM candidate cell, a random access preamble.

2 . The method of claim 1 , wherein the transmitting the random access preamble is based on:

at least one preamble-related parameter set configured for the LTM candidate cell; and

a pathloss associated with the LTM candidate cell.

3 . The method of claim 1 , further comprising:

after transmitting the random access preamble, receiving a second message comprising a timing advance value associated with the LTM candidate cell,

wherein:

the identifier of the LTM candidate cell included in the specific DCI is derived from a second identifier of the LTM candidate cell; and

the second identifier of the LTM candidate cell is indicated by the at least one configuration parameter associated with LTM included in the first RRC message.

4 . The method of claim 3 , further comprising:

determining, based on the value comprised in the second field of the specific DCI, a PDCCH order, of a second type, associated with the LTM candidate cell that is different from a PDCCH order, of a first type, associated with the serving cell.

5 . The method of claim 4 , wherein the first RRC message is received via a first cell of a serving cell group, and

wherein the second message is received via the first cell.

6 . The method of claim 5 , wherein the serving cell is the first cell or another serving cell of the serving cell group.

7 . The method of claim 5 , wherein the second message is comprised in a medium access control protocol data unit (MAC PDU), and

wherein the second message comprises a medium access control (MAC) control element (CE) indicating a switching from the first cell to the LTM candidate cell.

8 . The method of claim 1 , wherein the LTM candidate cell is an SpCell of a candidate cell group.

9 . The method of claim 1 , wherein the second message comprises:

a field indicating an identity of the LTM candidate cell;

a timing advance command field indicating the timing advance value that is associated with an amount of timing adjustment; and

a synchronization signal/physical broadcast channel (SS/PBCH) index field.

10 . The method of claim 1 , wherein the specific DCI further comprises a random access preamble index field.

11 . The method of claim 1 , wherein the first RRC message comprises at least one configuration parameter for a candidate mobility group (CMG), wherein the CMG is a candidate cell group comprising a plurality of LTM candidate cells, and wherein the candidate cell group comprises a candidate SpCell.

12 . The method of claim 1 , wherein the at least one configuration parameter associated with LTM comprises an RRC reconfiguration (RRCReconfiguration) message for an LTM candidate cell.

13 . The method of claim 12 , wherein the RRCReconfiguration message for the LTM candidate cell comprises a medium access control (MAC) cell group configuration (MAC-CellGroupConfig) for the LTM candidate cell.

14 . The method of claim 13 , wherein the MAC-CellGroupConfig for the LTM candidate cell comprises at least one of: timing advance group configuration information for the LTM candidate cell; or at least one discontinuous reception (DRX) configuration (DRX-Config) for the LTM candidate cell.

15 . The method of claim 1 , wherein the capability information comprises at least one parameter indicating the user device supports LTM.

16 . The method of claim 1 , wherein the second field of the specific DCI indicates an identifier of the LTM candidate cell.

17 . The method of claim 1 , wherein the first field of the specific DCI is a frequency domain resource assignment field.

18 . The method of claim 1 , further comprising:

determining a subcarrier spacing (SCS) of an uplink transmission from the user device, wherein the SCS is associated with an amount of time alignment for a timing advance group (TAG), and wherein the TAG is associated with the LTM candidate cell.

19 . The method of claim 18 , wherein the uplink transmission comprises a preamble transmission.

20 . The method of claim 1 , wherein size of the identifier of the LTM candidate cell is smaller than size of the second identifier of the LTM candidate cell.

Assignments (2)

Priority Claims (1)

Continuity (1)

References Cited (32)