Conditional handover with target master node driven delayed secondary cell group execution

A method for enabling conditional handover with delayed dual connectivity, the method comprising:

• receiving configuration information comprising at least a handover execution condition for a primary cell and an execution condition for at least one primary secondary cell with delayed dual connectivity execution enabled;
• determining whether the handover execution condition for the primary cell is satisfied and whether the execution condition for an associated primary secondary cell is satisfied;
• and
• if it is determined that the handover execution condition for the primary cell is satisfied but the execution condition for the associated primary secondary cell is not satisfied,
• enabling completion of conditional handover to the primary cell and postponing enabling completion of execution of the associated primary secondary cell for dual connectivity,
• wherein during postponing,
• maintaining the configuration of at least one configured primary secondary cell,
• performing measurements related to at least one of the maintained primary secondary cells,
• transmitting information related to the performed measurements towards the primary cell, and
• when receiving a trigger from the primary cell to access the associated primary secondary cell for which measurement information has been transmitted,
• accessing the associated primary secondary cell.

A target master node for a radio access network for enabling conditional handover with delayed dual connectivity, the target master node comprising at least one processor and at least one memory, said at least one memory stored with computer program code thereon, the at least one memory and the computer program code configured to, with the at least one processor, cause the target master node at least to perform:

• preparing configuration information comprising at least a handover execution condition for a primary cell and an execution condition for at least one primary secondary cell with delayed dual connectivity execution enabled, and sending the configuration information towards a user equipment;
• if it is determined that the handover execution condition for the primary cell is satisfied but the execution condition for an associated primary secondary cell is not satisfied,
• in response to received primary secondary cell related measurement results from the user equipment, deciding whether there is a chance for the execution condition for the associated primary secondary cell to be fulfilled in a predetermined time period;
• and if there is,
• enabling completion of conditional handover to the primary cell and postponing enabling completion of execution of the associated primary secondary cell for dual connectivity,
• wherein during postponing,
• maintaining the configuration of at least one configured primary secondary cell,
• receiving information related to performed measurements related to at least one of the maintained primary secondary cells, from the user equipment,
• requesting the user equipment to access the associated primary secondary cell for which measurement information has been received, by sending a trigger to the user equipment, and
• enabling the user equipment to access the associated primary secondary cell.

A method for enabling conditional handover with delayed dual connectivity, the method comprising:

• preparing configuration information comprising at least a handover execution condition for a primary cell and an execution condition for at least one primary secondary cell with delayed dual connectivity execution enabled, and sending the configuration information towards a user equipment;
• if it is determined that the handover execution condition for the primary cell is satisfied but the execution condition for an associated primary secondary cell is not satisfied,
• in response to received primary secondary cell related measurement results from the user equipment, deciding whether there is a chance for the execution condition for the associated primary secondary cell to be fulfilled in a predetermined time period;
• and if there is,
• enabling completion of conditional handover to the primary cell and postponing enabling completion of execution of the associated primary secondary cell for dual connectivity,
• wherein during postponing,
• maintaining the configuration of at least one configured primary secondary cell,
• receiving information related to performed measurements related to at least one of the maintained primary secondary cells, from the user equipment,
• requesting the user equipment to access the associated primary secondary cell for which measurement information has been received, by sending a trigger to the user equipment, and
• enabling the user equipment to access the associated primary secondary cell.