Method and apparatus for signalling radio link failure

An apparatus comprising:

• at least one processor;
• and
• at least one memory including computer program code;
• the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to:
• communicate with at least one further apparatus, wherein the further apparatus is configured to operate in a dual connectivity mode, in communication with a master cell group controlled by the apparatus for a primary cell and at least one secondary cell and in communication with a secondary cell group comprising a primary cell and at least one secondary cell;
• and
• receive information from the at least one further apparatus based on a radio link failure between the at least one further apparatus and the primary cell of the secondary cell group, the information explicitly informing the apparatus that the radio link failure occurred on the secondary cell group while the at least one further apparatus was waiting for a prepared conditional cell change from the primary cell of the secondary cell group to be fulfilled prior to initiation of execution of the prepared conditional cell change by the at least one further apparatus.

An apparatus comprising:

• at least one processor;
• and
• at least one memory including computer program code;
• the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to:
• communicate with at least one further apparatus, wherein the further apparatus is configured to operate in a dual connectivity mode, in communication with a master cell group comprising a primary cell and at least one secondary cell and in communication with a secondary cell group comprising a primary cell and the apparatus as a secondary cell;
• and
• receive a message from a master node for the master cell group, the message comprising information about execution by the at least one further apparatus of a triggered cell change for the primary cell of the secondary cell group, the information explicitly informing the apparatus that the radio link failure occurred on the secondary cell group while the at least one further apparatus was waiting for a prepared conditional cell change from the primary cell of the secondary cell group to be fulfilled prior to initiation of execution of the prepared conditional cell change by the at least one further apparatus.