SMF, AMF and UPF Relocation During UE Registration

A method comprising:

• receiving, by a target access and mobility management function (AMF) from a source AMF, a first message indicating a handover of a wireless device, the first message comprising one or more first parameters of a source session management function (SMF);
• selecting, by the target AMF and in response to the handover, a target SMF different from the source SMF;
• sending, by the target AMF to the target SMF, a second message indicating creation of at least one first packet data unit (PDU) session, the second message comprising at least one PDU session identifier of the at least one first PDU session;
• selecting, by the target SMF, a target user plane function (UPF) different from a source UPF;
• sending, by the target SMF to the target UPF, a third message requesting establishment of a session context for the at least one first PDU session;
• and
• receiving, by the target SMF from the target UPF, a fourth message acknowledging establishment of the session context.