Interfacciamenti di UMTS.
IuB-Node B application protocol (NBAP): fra Node-B e RNC.
IuR-Radio network system application protocol (RNSAP): fra diversi RNC.
IuCS-Radio access network application protocol (RANAP): fra RNC e Core
Network (CN) mediante MGW.
IuPS-Radio access network application protocol (RANAP): fra RNC e Core
Network (CN) mediante SGSN.
Uu: fra UE e Node-B.
Gn: fra i Core Network Nodes (CNN) di 2G GSM e 3G UMTS detti SGSN
(Serving GPRS Support Node) e GGSN (Gateway GPRS Support Node).
Mc: fra MGW e MSC.
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