Method of apparatus for monitoring for a radio link failure associated with a secondary cell of a secondary base station

A method comprising:

• responsive to a radio link problem associated with a primary secondary cell that is a first secondary cell of a secondary base station in communication with a user device that is also in communication with a master base station, receiving from a user device a relocation request at the secondary base station requesting relocation of said primary secondary cell from the first secondary cell of the secondary base station to a target secondary cell of the same secondary base station, wherein the first secondary cell and the second secondary cell of the secondary base station use different carriers;
• accepting by the secondary base station the request;
• and
• performing and completing, by the secondary base station and in conjunction with the user device, a relocation procedure to relocate the primary secondary cell from the first secondary cell to the target secondary cell, wherein the user device stays in a connected mode for at least the performing the relocation procedure and the completing the relocation procedure.

An apparatus, comprising:

• at least one processor;
• and
• at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the apparatus at least to:
• in a user device in communication with a master base station and a secondary base station, responsive to a radio link problem associated with a primary secondary cell that is a first secondary cell of a secondary base station, select by the user device a second secondary cell of the secondary base station as a target secondary cell, wherein the first secondary cell and the second secondary cell of the secondary base station use different carriers;
• initiate by the user device a relocation procedure with said target secondary cell, wherein said initiating comprises transmitting a relocation request by the user device directly to said secondary base station, the relocation request requesting relocation of the primary secondary cell from the first secondary cell to the target secondary cell;
• and
• complete by the user device the relocation procedure to relocate the primary secondary cell from the first secondary cell to the target secondary cell, wherein the user device stays in a connected mode for at least the initiating the relocation procedure and the completing the relocation procedure.