In one embodiment, a signaling bearer between the first node and the third node comprises an SRB3.
In one embodiment, the second node comprises an MN, and the third node comprises an SN.
In one embodiment, the second node comprises a Master eNodeB (MeNB), and the third node comprises a Secondary eNodeB (SgNB).
In one embodiment, the second node comprises a Centralized Unit (CU), and the third node comprises a DU.
In one embodiment, the second node comprises a node in an MCG, and the third node comprises a node in an SCG.
In one embodiment, the second node comprises an SN, and the third node comprises an MN.
In one embodiment, the second node comprises an SgNB, and the third node comprises an MeNB.
In one embodiment, the second node comprises a Distributed Unit (DU), and the third node comprises a CU.
In one embodiment, the second node comprises a node in an SCG, and the third node comprises a node in an MCG.
In one embodiment, the second node comprises a maintenance base station of a PCell, and the third node comprises a maintenance base station of a PSCell.
In one embodiment, the second node comprises a maintenance base station of a PSCell, and the third node comprises a maintenance base station of a PCell.
In one embodiment, the second node corresponds to the first entity, and the third node corresponds to the second entity.
In one embodiment, the second node corresponds to the second entity, and the third node corresponds to the first entity.