Target Node, User Equipment, Source Node and Methods Performed Thereby for Handling Reconfigurations of the User Equipment During a Conditional Handover

A method, performed by a target node in a communications network, for handling reconfigurations of a User Equipment (UE) during a conditional handover;

• wherein the target node has received a conditional handover request for the UE from a source node and has sent a handover request acknowledgement to the source node based on a current configuration of the UE;
• method comprising the target node:
• performing synchronization and random access with the UE based on the UE configuration used for the handover request acknowledgement;
• and
• obtaining, after performing the synchronization, information regarding an updated configuration of the UE, the updated configuration having taken place since the handover request acknowledgement was sent to the source node;
• wherein the information is obtained from the UE in a handover complete message and/or the information is obtained from the source node at the time of the handover execution.

A method, performed by a User Equipment (UE) in a communications network, for handling reconfigurations of the UE during a conditional handover, method comprising the UE:

• receiving, from a source node, a conditional handover message comprising a handover command prepared by a target node based on a current configuration of the UE and a condition for triggering a handover;
• receiving, from the source node and after having received the conditional handover message, a reconfiguration message;
• when the condition for triggering the handover is met, performing a handover from the source node to the target node;
• and
• when accessing the target node after having received the reconfiguration message from the source node, indicating, to the target node and in a handover complete message:
• an indication that the configuration of the UE has been updated since the handover command was received by the UE;
• and/or
• information regarding the updated configuration of the UE.

A method, performed by a source node in a communications network, for handling reconfigurations of a User Equipment (UE) during a conditional handover;

• wherein the source node has sent a conditional handover request for a UE to a target node and has received a handover request acknowledgement from the target node based on a current configuration of the UE;
• the method comprising the source node:
• sending, to the UE, a conditional handover message comprising a handover command prepared by the target node based on the current configuration of the UE and a condition for triggering a handover;
• performing a reconfiguration of the UE after having sent the conditional handover message;
• and
• sending, to the target node, at the time of the handover execution, information regarding the updated configuration of the UE.

A target node in a communications network, for handling reconfigurations of a User Equipment (UE) during a conditional handover;

• wherein the target node is configured to have received a conditional handover request for a UE from a source node and is configured to have sent a handover request acknowledgement to the source node based on a current configuration of the UE;
• the target node comprising:
• processing circuitry;
• memory containing instructions executable by the processing circuitry whereby the target node is operative to:
• perform synchronization and random access with the UE based on the UE configuration configured to be used for the handover request acknowledgement;
• obtain, after performing the synchronization, information regarding an updated configuration of the UE, the updated configuration being configured to have taken place since the handover request acknowledgement was sent to the source node;
• wherein the information is obtained from the UE in a handover complete message and/or the information is obtained from the source node at the time of the handover execution.

A user equipment (UE) in a communications network, for handling reconfigurations of the UE during a conditional handover, the UE comprising:

• processing circuitry;
• memory containing instructions executable by the processing circuitry whereby the UE is operative to:
• receive, from a source node, a conditional handover message comprising a handover command prepared by a target node based on a current configuration of the UE and a condition for triggering a handover;
• receive, from the source node and after having received the conditional handover message, a reconfiguration message;
• perform, when the condition for triggering the handover is met, a handover from the source node to the target node;
• when accessing the target node, after having received the reconfiguration message from the source node, indicate, to the target node, in a handover complete message:
• an indication that the configuration of the UE has been updated since the handover command was received by the UE;
• and/or
• information regarding the updated configuration of the UE.

A source node in a communications network, for handling reconfigurations of a User Equipment (UE) during a conditional handover;

• wherein the source node has sent a conditional handover request for a UE to a target node and has received a handover request acknowledgement from the target node based on a current configuration of the UE;
• the source node comprising:
• processing circuitry;
• memory containing instructions executable by the processing circuitry whereby the source node is operative to:
• send, to the UE, a conditional handover message comprising a handover command prepared by the target node based on the current configuration of the UE and a condition for triggering a handover;
• perform a reconfiguration of the UE after having sent the conditional handover message;
• and
• send, to the target node, at the time of the handover execution, information regarding the updated configuration of the UE.