Secondary cell group (SCG) deactivation at mobility

A method performed by a target Master Node (MN) comprising:

• receiving a request for handover from a source MN for a user equipment (UE) with activated or deactivated secondary cell group (SCG) wherein the request is received with user plane traffic load information;
• determining whether the SCG should be activated or deactivated based on the user plane traffic load information;
• transmitting a request to a target secondary node (SN) for addition of an SCG to a UE target configuration, wherein the request to the target SN includes the received user plane traffic load information;
• receiving a response from the target SN including an indication enabling the target MN to determine whether a SCG's mode of operation was accepted or not;
• and
• transmitting a response to the source MN, wherein the response includes a Handover Command comprising a reconfiguration message having a reconfigurationWithSync with the UE target configuration.

A source master node (MN) comprising:

• processing circuitry;
• and
• memory coupled with the processing circuitry, wherein the memory includes instructions that when executed by the processing circuitry causes the MN to perform operations comprising:
• transmitting a request for handover for a user equipment (UE) with deactivated secondary cell group (SCG) to a target MN, the request transmitted with user plane traffic load information;
• receiving, from the target MN, a response including a Handover Command comprising a reconfiguration message containing reconfiguration WithSync with a UE target configuration and an indication of activated or deactivated SCG;
• and
• transmitting the reconfiguration message containing the reconfiguration WithSync to the UE with the UE target configuration.

A target master node (MN) comprising:

• processing circuitry;
• and
• memory coupled with the processing circuitry, wherein the memory includes instructions that when executed by the processing circuitry causes the target MN to perform operations comprising:
• receiving a request for handover from a source MN for a user equipment (UE) with activated or deactivated secondary cell group, (SCG) wherein the request is received with user plane traffic load information;
• determining whether the SCG should be activated or deactivated based on the user plane traffic load information;
• transmitting a request to a target secondary node (SN) for addition of an SCG to a UE target configuration, wherein the request to the target SN includes the received user plane traffic load information;
• receiving a response from the target SN including an indication enabling the target MN to determine whether a SCG's mode of operation was accepted or not;
• and
• transmitting a response to the source MN, wherein the response includes a Handover Command comprising a reconfiguration message having a reconfigurationWithSync with the UE target configuration.

A target secondary node (SN) comprising:

• processing circuitry;
• and
• memory coupled with the processing circuitry, wherein the memory includes instructions that when executed by the processing circuitry causes the SN to perform operations comprising:
• receiving a request from a source master node (MN) for addition of a secondary cell group (SCG) to a user equipment (UE) target configuration, wherein the request is received with user plane traffic load information of a current SCG;
• and
• transmitting a response to the source MN including an indication enabling the source MN to determine whether a SCG's mode of operation was accepted or not.