1. A serving node of a radio access network (RAN), the serving node comprising:a radio interface;
a network interface;
a processor; and
a non-transitory memory storing instructions that when executed by the processor cause the serving node to:
receive, using the radio interface, from a user equipment (UE) operating in an inactive mode, an identifier of the UE and a first message, the first message being protected with a first cryptographic key wherein the first cryptographic key is associated with a second network node of the RAN;
send, using the network interface, to the second network node, a UE context retrieval request, the UE context retrieval request including the identifier of the UE and the first message;
receive, using the network interface, from the second network node, a UE context retrieval response, the UE context retrieval response including a relocation indication of whether a UE context is to be relocated to the serving node, wherein when the relocation indication indicates that the UE context is not relocated to the serving node, the UE context retrieval response includes a second message protected with a second cryptographic key wherein the second cryptographic key is associated with the second network node; and
send, using the radio interface, the second message to the UE.