The full 3GPP specification with all details and without any additional explanations.

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The GTPv2-C (GPRS Tunnelling Protocol version2 Control Plane) protocol is used on the control plane between the LTE core nodes, MME, S-GW, PDN-GW. It is also used between LTE nodes and UMTS nodes. MME and S-GW to SGSN. It is used for signalling about the EPS bearer set-up and forwarding of UE context during MME change.

NAS in the Control Plane

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