2G: Second Generation of Cellular communications.
BTS: Base Transceiver Station.
BSC: Base Station Controller.
GERAN: GSM EDGE Radio Access Network.
GSM: Global System for Mobile Communications.
MGW: Media Gateway.
MSC Server: Mobile Switching Center.
GMSC Server: Gateway Mobile Switching Server.
PSTN: Public Switching Telephone Network.
3G: Third Generation of Cellular Communications
NodeB: is the 3G radio base station receiver.
UTRAN: UMTS Terrestrial Radio Access Network.
UMTS: Universal Mobile Telecommunications Service.
RNC: Radio Network Controller.
SGSN: Serving GPRS Support Node.
GPRS: General Packet Radio Service.
HLR: Home Location Register.
AuC: Authentication Center.
EIR: Equipment Identity Register.
GGSN: Gateway GPRS Support Node.
PSCN: Packet Switching Core Network.
4G: Fourth generation of cellular communications.
LTE: Long Term Evolution.
VoLTE: Voice over LTE.
eNodeB: Enhanced NodeB.
E-UTRAN: Evolved-UTRAN.
MME: Mobility Management Entity.
SGW: Serving Gateway.
PGW: PDN Gateway.
PDN: Packet Data Network.
HSS-EPC: Home Subscriber Server Evolved Packet Core.
IMS: IP Multimedia Subsystem.
IP: Internet Protocol.
UDR: Unified Data Repository.
5G: Fifth Generation. Also called New Radio (NR).
VoNR: Voice over New Radio.
RAN: Radio Access Network.
AMF: Access & Mobility Management Function.
SMF: Session Management Function.
UPF: User Plane Function.
AUSF:Authentication Server Function.
UDM: Unified Data Management.
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