Granted Patent B2

US 12,604,242 · App. 18/007,181 · Granted Apr 14, 2026

Inventor: Lianhai Wu (Beijing, CN)

Assignee: LENOVO (BEIJING) LIMITED

H04W36/0079H04W36/00226H04W36/00837H04W76/19H04W76/30

Abstract

Claims (45)

1 . An apparatus for wireless communication, comprising:

at least one memory; and

at least one processor coupled with the at least one memory and configured to cause the apparatus to:

receive a mobility command message from a source new radio (NR) cell, wherein the mobility command message includes an identifier (ID) of a target cell, and the target cell is at least one of an evolved universal terrestrial radio access network (E-UTRAN) cell and a universal terrestrial radio access network (UTRAN) cell;

determine whether a timer for initiating failure recovery based on triggering a measurement report is running;

when the timer is running, stop the timer;

perform a handover procedure to the target cell;

in response to an occurrence of a handover failure during the handover procedure, perform a cell selection procedure and select a UTRAN cell as a candidate cell; and

initiate a radio resource control (RRC) re-establishment procedure to the selected candidate cell.

2 . The apparatus of claim 1 , wherein the at least one processor is further configured to cause the apparatus to:

receive an RRC reconfiguration message including conditional handover (CHO) configuration information associated with the one or more candidate cells;

determine whether the selected candidate cell is configured with the CHO configuration information; and

in response to the selected candidate cell being configured with the CHO configuration information, perform CHO procedure to the selected candidate cell.

3 . The apparatus of claim 1 , wherein the at least one processor is further configured to cause the apparatus to:

in response to the occurrence of the handover failure, transmit radio link failure (RLF) report information.

4 . The apparatus of claim 3 , wherein, in response to the mobility command message including a voice fallback indication, the RLF report information includes an indicator to indicate that the handover procedure is used for a voice fallback operation.

5 . The apparatus of claim 3 , wherein the apparatus is a user equipment (UE), wherein the RLF report information is transmitted to a base station (BS) serving the UE, and wherein the BS forwards a message including the RLF report information to a source BS associated with the source NR cell.

6 . An apparatus for wireless communication, comprising:

at least one memory; and

at least one processor coupled with the at least one memory and configured to cause the apparatus to:

receive a mobility command message from a source new radio (NR) cell, wherein the mobility command message includes an identifier (ID) of a target cell, and the target cell is at least one of an evolved universal terrestrial radio access network (E-UTRAN) cell and a universal terrestrial radio access network (UTRAN) cell;

determine whether a timer for initiating failure recovery based on triggering a measurement report is running;

when the timer is running, stop the timer;

perform a handover procedure to the target cell; and

in response to an occurrence of a handover failure during the handover procedure, transmit radio link failure (RLF) report information,

wherein the RLF report information includes an indicator to indicate that the handover procedure is used for a voice fallback operation when the mobility command message including a voice fallback indication.

7 . The apparatus of claim 6 , wherein, in response to the occurrence of the handover failure during the handover procedure, the at least one processor is configured to cause the apparatus to:

perform a cell selection procedure and select a candidate cell; and

initiate a radio resource control (RRC) re-establishment procedure to the selected candidate cell.

8 . The apparatus of claim 7 , wherein the selected candidate cell is at least one of an NR cell, a E-UTRAN cell, and a UTRAN cell.

9 . The apparatus of claim 7 , wherein the at least one processor is further configured to cause the apparatus to:

receive an RRC reconfiguration message including conditional handover (CHO) configuration information associated with one or more candidate cells;

determine whether the selected candidate cell is configured with the CHO configuration information; and

in response to the selected candidate cell being configured with the CHO configuration information, perform a CHO procedure to the selected candidate cell.

10 . A user equipment (UE) for wireless communication, comprising:

at least one memory; and

at least one processor coupled with the at least one memory and configured to cause the UE to:

receive a mobility command message from a source new radio (NR) cell, wherein the mobility command message includes an identifier (ID) of a target cell, and the target cell is at least one of an evolved universal terrestrial radio access network (E-UTRAN) cell and a universal terrestrial radio access network (UTRAN) cell;

determine whether a timer for initiating failure recovery based on triggering a measurement report is running;

when the timer is running, stop the timer;

perform a handover procedure to the target cell;

in response to an occurrence of a handover failure during the handover procedure:

perform a cell selection procedure and select a UTRAN cell as a candidate cell;

initiate a radio resource control (RRC) re-establishment procedure to the selected candidate cell; and

transmit radio link failure (RLF) report information to a base station (BS) serving the UE.

Assignments (1)

Continuity (1)

References Cited (20)