NSA-ENDC Interfaces

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It ‘s possible to transmit the user plane between both nodes to the EPC but control plane is only possible on the ENDC side.
GTP (GPRS Tunneling Protocol) . S1 user plane is tunneled between the LTE node and SGW using GTP-U. 
UDP (User Datagram Protocol)
S1AP (S1 Application Protocol)
SCTP (Stream Control Transmission Protocol)

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