UDM
UDM(Unified Data Management) provides UE authentication, registration/mobility management, subscription management, SMS management.
UDR
UDR(Unified Data Repository) allows 5G NF(Network Function) to store and retrieve data. Storable data includes subscriber data, policy data, structured data, application data, etc.
SEPP
SEPP(Security Edge Protection Proxy) is a proxy that provides message filtering and policy and topology hiding at the Inter-PLMN (Public Land Mobile Network) Control Plan Interface among 5G Core network functions.
NRF
NRF(Network Repository Function) is a NF(Network Function) Service Framework component system, defined by 3GPP 5G standard. This infra system supports interconnection between 5G Core NFs by monitoring dynamically changed 5G Core NF service status and managing interworking information(e.g. IP address, FQDN, etc.)
UPF
UPF(User Plane Function) connects UE and external data network in 5G core network. Interworking with SMF(Session Management Function), UPF manages PDU(Packet Data Unit) session and routes packet between UE and external data network in order to transmit.
HLR/HSS
HLR(Home Location Register)/HSS(Home Subscriber Server) is a fundamental system in 3G and 4G newtork which in real time manages mobile subscriber information: location information, authentication information, service information, permission, add-on information, etc. Interworking with MSC/VLR, SGSN, MME, SMSC, OTA, Service Node, it serves outgoing/incoming, authentication, short message, packet transmit, location information, IN(Intelligent Network), and AUC which authenticates 3G/4G subscriber as well.
GLR
Telcoware GLR(Gateway Location Register) has both features of HLR/VLR, a fundamental element of mobile telecommunication network, and protocol conversion. GLR acts as a gateway to support roaming service among service providers using different MAP(Mobile Application Part) protocol(GSM, ANSI-41, PDC, etc.)
5G-EIR
5G-EIR(Equipment Identity Register) is a network function that checks PEI(Permanent Equipment Identifier) status such as PEI blacklist status, etc.
NPDB
NPDB(Number Portability DataBase) is a database system that includes information necessary for supporting number portability. (Number portability is a feature that allows a subscriber to move to another service provider while retaining his/her number.)
Telcobase™
Telcobase™, a MMDBMS(Main Memory Database Management System) software, uses memory as data storage and manages the memory. While original DBMS saves DB in disk and uses memory as a minor device, MMDBMS resides DB in main memory and uses disk as a backup device.