# US 12,604,243 B2 · Method and apparatus for performing conditional PSCell addition and change continuously in wireless communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,604,243 B2 - Document ID: US12604243B2 - Status: Granted - Kind: B2 - Application number: 18/365,723 - Filed: 2023-08-04 - Published: 2024-02-08 - Granted: 2026-04-14 - Earliest claimed: 2022-08-04 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Seungri Jin - Web page: https://patentgrep.com/patent/US12604243B2 ## CPC - H04W 36/00835: {Determination of neighbour cell lists} - H04W 36/362: {Conditional handover} - H04W 36/00692: {using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO] (allocation of physical resources in CoMP or in CA H04L5/0035)} - H04W 36/08: Reselecting an access point - H04W 36/00698: {using different RATs} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. An embodiment of the disclosure may provide a method and apparatus for performing conditional PSCell addition and change continuously in a next-generation mobile communication system. ## Claims ### Claim 1 A method performed by a terminal in a wireless communication system, the method comprising: transmitting, to a base station, capability information of the terminal comprising information indicating that the terminal supports a subsequent conditional primary secondary cell group (SCG) cell (PSCell) addition or change (CPAC); receiving, from the base station, a first message comprising conditional reconfiguration information, the conditional reconfiguration information comprising configuration information of at least one candidate PSCell, information on at least one execution condition for a conditional PSCell addition (CPA) or a conditional PSCell change (CPC) of the at least one candidate PSCell, and information associated with the subsequent CPAC; in case that at least one execution condition for the CPA or the CPC of a first PSCell among the at least one candidate PSCell is satisfied, transmitting, to the base station, a second message for an addition of the first PSCell or for a change to the first PSCell; and evaluating the at least one execution condition for the CPA or the CPC of the at least one candidate PSCell after completion of the addition of the first PSCell or the change to the first PSCell, wherein the conditional reconfiguration information is kept in the terminal. ### Claim 2 (depends on 1) The method of claim 1, wherein the evaluating further comprises: in case that at least one execution condition for the CPC of a second PSCell among the at least one candidate PSCell is satisfied, transmitting, to the base station, a third message for a change from the first PSCell to the second PSCell. ### Claim 3 (depends on 1) The method of claim 1, wherein the first message is a message to modify a radio resource control (RRC) connection. ### Claim 4 (depends on 1) The method of claim 1, wherein the conditional reconfiguration information is kept in the terminal unless the base station indicates to release the conditional reconfiguration information. ### Claim 5 A method performed by a first base station in a wireless communication system, the method comprising: receiving, from a terminal, capability information of the terminal comprising information indicating that the terminal supports a subsequent conditional primary secondary cell group (SCG) cell (PSCell) addition or change (CPAC); transmitting, to the terminal, a first message comprising conditional reconfiguration information, the conditional reconfiguration information comprising configuration information of at least one candidate PSCell, information on at least one execution condition for a conditional PSCell addition (CPA) or a conditional PSCell change (CPC) of the at least one candidate PSCell, and information associated with the subsequent CPAC; in case that at least one execution condition for the CPA or the CPC of a first PSCell among the at least one candidate PSCell is satisfied, receiving, from the terminal, a second message for an addition of the first PSCell or for a change to the first PSCell; and transmitting, to a second base station for the first PSCell, a third message for the addition of the first PSCell or for the change to the first PSCell, wherein the conditional reconfiguration information is kept in the terminal after completion of the addition of the first PSCell or the change to the first PSCell. ### Claim 6 (depends on 5) The method of claim 5, further comprising: in case that at least one execution condition for the CPC of a second PSCell among the at least one candidate PSCell is satisfied, receiving, from the terminal, a fourth message for a change from the first PSCell to the second PSCell. ### Claim 7 (depends on 5) The method of claim 5, wherein the first message is a message to modify a radio resource control (RRC) connection. ### Claim 8 (depends on 5) The method of claim 5, wherein the conditional reconfiguration information is kept in the terminal unless the base station indicates to release the conditional reconfiguration information. ### Claim 9 A terminal in a wireless communication system, the terminal comprising: a transceiver; and a controller coupled with the transceiver and configured to: transmit, to a base station, capability information of the terminal comprising information indicating that the terminal supports a subsequent conditional primary secondary cell group (SCG) cell (PSCell) addition or change (CPAC), receive, from the base station, a first message comprising conditional reconfiguration information, the conditional reconfiguration information comprising configuration information of at least one candidate PSCell, information on at least one execution condition for a conditional PSCell addition (CPA) or a conditional PSCell change (CPC) of the at least one candidate PSCell, and information associated with the subsequent CPAC, in case that at least one execution condition for the CPA or the CPC of a first PSCell among the at least one candidate PSCell is satisfied, transmit, to the base station, a second message for an addition of the first PSCell or for a change to the first PSCell, and evaluate the at least one execution condition for the CPA or the CPC of the at least one candidate PSCell after completion of the addition of the first PSCell or the change to the first PSCell, wherein the conditional reconfiguration information is kept in the terminal. ### Claim 10 (depends on 9) The terminal of claim 9, wherein the controller is further configured to: in case that at least one execution condition for the CPC of a second PSCell among the at least one candidate PSCell is satisfied, transmit, to the base station, a third message for a change from the first PSCell to the second PSCell. ### Claim 11 (depends on 9) The terminal of claim 9, wherein the first message is a message to modify a radio resource control (RRC) connection. ### Claim 12 (depends on 9) The terminal of claim 9, wherein the conditional reconfiguration information is kept in the terminal unless the base station indicates to release the conditional reconfiguration information. ### Claim 13 A first base station in a wireless communication system, the first base station comprising: a transceiver; and a controller coupled with the transceiver and configured to: receive, from a terminal, capability information of the terminal comprising information indicating that the terminal supports a subsequent conditional primary secondary cell group (SCG) cell (PSCell) addition or change (CPAC), transmit, to the terminal, a first message comprising conditional reconfiguration information, the conditional reconfiguration information comprising configuration information of at least one candidate PSCell, information on at least one execution condition for a conditional PSCell addition (CPA) or a conditional PSCell change (CPC) of the at least one candidate PSCell, and information associated with the subsequent CPAC, in case that at least one execution condition for the CPA or the CPC of a first PSCell among the at least one candidate PSCell is satisfied, receive, from the terminal, a second message for an addition of the first PSCell or for a change to the first PSCell, and transmit, to a second base station for the first PSCell, a third message for the addition of the first PSCell or for the change to the first PSCell, wherein the conditional reconfiguration information is kept in the terminal after completion of the addition of the first PSCell or the change to the first PSCell. ### Claim 14 (depends on 13) The first base station of claim 13, wherein the controller is further configured to: in case that at least one execution condition for the CPC of a second PSCell among the at least one candidate PSCell is satisfied, receive, from the terminal, a fourth message for a change from the first PSCell to the second PSCell. ### Claim 15 (depends on 13) The first base station of claim 13, wherein the first message is a message to modify a radio resource control (RRC) connection. ### Claim 16 (depends on 13) The first base station of claim 13, wherein the conditional reconfiguration information is kept in the terminal unless the base station indicates to release the conditional reconfiguration information.