5G Tutorial
UDM Function
UDM Functional Description
UDM Specifications
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AMF Functional Description
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SMF Functional Description
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UPF Functional Description
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PCF Functional Description
PCF Specifications
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NEF Functional Description
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NRF Functional Description
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AUSF Functional Description
AUSF Specifications
N3IWF Function
N3IWF Function Description
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Application Functional Description
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UDR Functional Description
UDR Specifications
UDSF Function
UDSF Functional Description
SMSF Function
SMSF Functional Description
SMSF Specifications
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NSSF Functional Description
NSSF Specifications
5G-EIR Function
5G-EIR Functional Description
5G-EIR Specifications
LMF Function
LMF Functional Description
LMF Specifications
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SEPP Functional Description
NWDAF Function
NWDAF Functional Description
NWDAF Specifications
Data Types

Unified Data Management Functional Description

Below are the Functionalities supported by Unified Data Management (UDM), a single Instance of UDM may implement some are all Functionalities.

Generation of 3GPP AKA Authentication Credentials.

User Identification Handling like storage and management of SUPI for each subscriber in 5G.

Support of de-concealment of privacy-protected subscription identifier (SUCI)

Access authorization based on subscription data

UEs Serving NF Registration Management , storing serving AMF for UE, storing serving SMF for UEs PDU Session.

MT-SMS delivery support.

Lawful Intercept Functionality

Subscription management.

SMS management.

To provide this functionality, the UDM uses subscription data (including authentication data) that may be stored in UDR, in which case a UDM implements the application logic and does not require an internal user data storage and then several different UDMs may serve the same user in different transactions.


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