# US 12,004,031 B2 · UE and base station in mobile communication system and operating method therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,004,031 B2 - Document ID: US12004031B2 - Status: Granted - Kind: B2 - Application number: 17/309,003 - Filed: 2019-10-04 - Published: 2021-12-02 - Granted: 2024-06-04 - Earliest claimed: 2018-10-11 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Seungri Jin; Sangkyu Baek; Soenghun Kim; Hyunjeong Kang; June Hwang - Web page: https://patentgrep.com/patent/US12004031B2 ## CPC - H04W 4/44: for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H] - H04W 36/00837: {Determination of triggering parameters for hand-off} - H04W 4/40: for vehicles, e.g. vehicle-to-pedestrians [V2P] - H04W 36/0058: {Transmission of hand-off measurement information, e.g. measurement reports} - H04W 36/00838: {Resource reservation for handover} - H04W 36/085: {involving beams of access points} - H04W 36/362: {Conditional handover} - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W 36/037: {by reducing handover delay, e.g. latency} - H04W 74/0838: using contention-free random access [CFRA] - H04W 92/18: between terminal devices - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract According to an aspect of the disclosure, a method of performing a conditional handover by a vehicle-to-everything (V2X) user equipment (UE) may include: transmitting a cell measurement report to a serving cell; receiving conditional handover configuration information from the serving cell; determining whether to perform a handover, based on the conditional handover configuration information; and when it is determined to perform the handover, performing random access to a target cell. ## Claims ### Claim 1 A method of performing a conditional handover by a user equipment (UE) supporting vehicle-to-everything (V2X) communication, the method comprising: transmitting a measurement report to a first base station; receiving a radio resource control (RRC) reconfiguration message from the first base station, wherein the RRC reconfiguration message comprises information regarding at least one execution condition for the conditional handover and resource configuration information for V2X ; identifying a target cell for execution of the conditional handover, based on the information regarding the at least one execution condition for the conditional handover; performing the V2X communication based on the resource configuration information for V2X, for the identified target cell; and transmitting an RRC reconfiguration complete message to a second base station, wherein the resource configuration information for V2X comprises resource pool configuration information for long term evolution (LTE) V2X and resource pool configuration information for new radio (NR) V2X, and wherein the resource pool configuration information for LTE V2X comprises exceptional resource pool configuration information for LTE V2X, and the resource pool configuration information for NR V2X comprises exceptional resource pool configuration information for NR V2X. ### Claim 2 (depends on 1) The method of claim 1, wherein the RRC reconfiguration message further comprises information regarding at least one target cell, and wherein the information regarding the at least one execution condition for the conditional handover comprises at least one of: a threshold associated with a serving cell; a threshold associated with a target cell; or a time period in which quality of the target cell is required to be higher than the threshold associated with the target cell. ### Claim 3 (depends on 1) The method of claim 1, further comprising performing synchronization, to the target cell. ### Claim 4 (depends on 1) The method of claim 1, further comprising performing random access to the target cell. ### Claim 5 (depends on 1) The method of claim 1, further comprising transmitting, to the first base station, UE capability information indicating that the UE supports the conditional handover. ### Claim 6 A method performed by a first base station in a wireless communication system supporting vehicle-to-everything (V2X) communication, the method comprising: receiving a measurement report from a user equipment (UE); determining whether to apply a conditional handover for the UE, based on the measurement report; transmitting a handover request message to at least one second base station; receiving a handover request acknowledge message from the second base station; and transmitting a radio resource control (RRC) reconfiguration message to the UE, wherein the RRC reconfiguration message comprises information regarding at least one execution condition for the conditional handover and resource configuration information for V2X, wherein a target cell for execution of the conditional handover is identified at the UE, based on the information regarding the at least one execution condition for the conditional handover, wherein, for the identified target cell, the V2X communication is performed at the UE based on the resource configuration information for V2X, wherein an RRC reconfiguration complete message is transmitted at the UE to the second base station, wherein the resource configuration information for V2X comprises resource pool configuration information for long term evolution (LTE) V2X and resource pool configuration information for new radio (NR) V2X, and wherein the resource pool configuration information for LTE V2X comprises exceptional resource pool configuration information for LTE V2X, and the resource pool configuration information for NR V2X comprises exceptional resource pool configuration information for NR V2X. ### Claim 7 (depends on 6) The method of claim 6, wherein the RRC reconfiguration message further comprises information regarding at least one target cell, and wherein the information regarding the at least one execution condition for the conditional handover comprises at least one of: a threshold associated with a serving cell; a threshold associated with a target cell; or a time period in which quality of the target cell is required to be higher than the threshold associated with the target cell. ### Claim 8 A user equipment (UE) supporting vehicle-to-everything (V2X) communication and configured to perform a conditional handover, the UE comprising: a transceiver; and a controller configured to: transmit a measurement report to a first base station, receive a radio resource control (RRC) reconfiguration message from the first base station, wherein the RRC reconfiguration message comprises information regarding at least one execution condition for the conditional handover and resource configuration information for V2X, identify a target cell for execution of the conditional handover, based on the information regarding the at least one execution condition for the conditional handover, perform the V2X communication based on the resource configuration information for V2X, for the identified target cell, and transmit an RRC reconfiguration complete message to a second base station, wherein the resource configuration information for V2X comprises resource pool configuration information for long term evolution (LTE) V2X and resource pool configuration information for new radio (NR) V2X, and wherein the resource pool configuration information for LTE V2X comprises exceptional resource pool configuration information for LTE V2X, and the resource pool configuration information for NR V2X comprises exceptional resource pool configuration information for NR V2X. ### Claim 9 A first base station configured to operate in a wireless communication system supporting vehicle-to-everything (V2X) communication, the first base station comprising: a transceiver; and a controller configured to: receive a measurement report from a user equipment (UE), determine whether to apply a conditional handover for the UE, based on the measurement report, transmit a handover request message to at least one second base station, receive a handover request acknowledge message from the second base station, and transmit a radio resource control (RRC) reconfiguration message to the UE, wherein the RRC reconfiguration message comprises information regarding at least one execution condition for the conditional handover and resource configuration information for V2X, wherein a target cell for execution of the conditional handover is identified at the UE, based on the information regarding the at least one execution condition for the conditional handover, wherein, for the identified target cell, the V2X communication is performed at the UE based on the resource configuration information for V2X, wherein an RRC reconfiguration complete message is transmitted at the UE to the second base station, wherein the resource configuration information for V2X comprises resource pool configuration information for long term evolution (LTE) V2X and resource pool configuration information for new radio (NR) V2X, and wherein the resource pool configuration information for LTE V2X comprises exceptional resource pool configuration information for LTE V2X, and the resource pool configuration information for NR V2X comprises exceptional resource pool configuration information for NR V2X. ### Claim 10 (depends on 6) The method of claim 6, wherein synchronization to the target cell is performed at the UE. ### Claim 11 (depends on 6) The method of claim 6, wherein random access to the target cell is performed at the UE. ### Claim 12 (depends on 8) The UE of claim 8, wherein the RRC reconfiguration message further comprises information regarding at least one target cell, and wherein the information regarding the at least one execution condition for the conditional handover comprises at least one of: a threshold associated with a serving cell; a threshold associated with a target cell; or a time period in which quality of the target cell is required to be higher than the threshold associated with the target cell. ### Claim 13 (depends on 8) The UE of claim 8, wherein the controller is further configured to perform synchronization to the target cell. ### Claim 14 (depends on 8) The UE of claim 8, wherein the controller is further configured to perform random access to the target cell. ### Claim 15 (depends on 8) The UE of claim 8, wherein the controller is further configured to transmit, to the first base station, UE capability information indicating that the UE supports the conditional handover. ### Claim 16 (depends on 9) The first base station of claim 9, wherein the RRC reconfiguration message further comprises information regarding at least one target cell, and wherein the information regarding the at least one execution condition for the conditional handover comprises at least one of: a threshold associated with a serving cell; a threshold associated with a target cell; or a time period in which quality of the target cell is required to be higher than the threshold associated with the target cell. ### Claim 17 (depends on 9) The first base station of claim 9, wherein synchronization to the target cell is performed at the UE. ### Claim 18 (depends on 9) The first base station of claim 9, wherein random access to the target cell is performed at the UE.