Description
The Distinguished Name (DN) is a core concept in the 3GPP Telecommunications Management Network (TMN) and Network Management (NM) architecture, heavily based on the OSI X.500 directory model. It provides a globally unique, hierarchical path to identify any managed object instance within the management information tree. A DN is constructed as a sequence of Relative Distinguished Names (RDNs), where each RDN is an attribute-value pair (e.g., `SubNetwork=PLMN-PLMN`, `ManagedElement=ME123`). This sequence starts from the root of the management tree and traverses down to the specific object, forming an unambiguous address like `SubNetwork=PLMN-PLMN/ManagedElement=ME123/Equipment=1`. This structure mirrors the physical or logical hierarchy of the network, such as Network, SubNetwork, Managed Element, and Equipment.
In operation, the DN is the primary key used in all management interfaces, particularly the Itf-N (northbound interface) and within the Integration Reference Point (IRP) framework defined in the 32-series specifications. When a Network Manager (NM) or Element Manager (EM) needs to retrieve performance measurements, configure a parameter, or receive a fault notification, it uses the DN to specify the exact target object. The management system's Information Service (IS) uses these DNs to organize and retrieve data from its managed object repositories. The hierarchical nature allows for efficient scoping of operations; for instance, a manager can request all alarms for a specific `SubNetwork` by using its DN as a scope filter.
The role of the DN is critical for ensuring consistency, traceability, and automation in network management. It decouples the logical identity of a resource from its physical IP address or other transient identifiers. This is essential for multi-vendor environments and for lifecycle management tasks like software upgrades or capacity expansions, where objects may be reconfigured or replaced. The comprehensive set of naming conventions and rules for constructing DNs is meticulously defined in 3GPP TS 32.300, ensuring interoperability between different management systems and network elements from various suppliers.
Purpose & Motivation
The Distinguished Name was introduced to solve the fundamental problem of uniquely and consistently identifying the millions of configurable and monitorable entities within a complex, multi-vendor telecom network. Prior to standardized hierarchical naming, management systems relied on proprietary or flat addressing schemes, which led to integration nightmares, ambiguous references, and an inability to automate large-scale operations. The DN provides a unified 'address book' for the entire network.
Its creation was motivated by the OSI systems management framework and the need for a robust Telecommunications Management Network (TMN) as networks grew in scale and complexity. The hierarchical structure directly models the network's own architecture, making it intuitive for engineers and scalable for software. It addresses the limitation of simple names or indexes by embedding relational context; the DN of an object implicitly indicates its containment within a specific site, network slice, or vendor domain.
This capability is the bedrock for automated provisioning, fault correlation, and performance management. By providing a stable, logical identifier, it allows management applications to refer to a network resource reliably throughout its entire lifecycle, even as its physical characteristics or connections change. This is indispensable for modern, software-driven operations.
Detected Changes Across Releases
from 3GPP Change RequestsSpecific changes extracted from the „Change history“ tables of 3GPP specifications (45 CRs across 5 releases). Complements the general historical overview above with the evidence-based evolution of this function.
Studied in Rel-4, normative work from Rel-15.
In Release 15, the primary change for the "DN" function was a clarification of its abbreviation, which was changed from "Destination Network" to stand for both "Data Network" and "Distinguished Name." The introduced enhancements focused on procedures involving an external DN-AAA server for reauthentication and authorization, with specific clarifications and corrections for the transfer of DN authorization data between network functions like the PCF and SMF, and for the coding of the SM PDU DN request container.
- ReAuthentication by an external DN-AAA server TS 23.501CR0290
- Clarification on DN authorization data between PCF and SMF TS 23.501CR0726
- Clarification on DN authorization data TS 23.501CR0824
- Correction for SM PDU DN request container coding TS 24.501CR0376
- Final result of authentication/authorization from the DN-AAA – Receiving entity TS 29.561CR0004
- Correct the DN to URI mapping rules TS 32.158CR0003
In Release 16, the primary update for the "DN" function was a clarification of its abbreviation, which was changed from "Destination Network" to explicitly mean "Data Network and Distinguished Name." This release also introduced several new capabilities involving the DN-AAA server, including procedures for re-authentication, authorization, and enabling the SMF to request the UE's IP address based on subscription information. Furthermore, enhancements were made for DN-specific management, such as defining a list of allowed VLAN IDs within DN authorization data and specifying that one PDU session connects to only one DN.
- Add DN-AAA re-authentication TS 29.561CR0010
- DN interworking of UPF for PIM TS 29.561CR0019
- Subscription trigger request UE IP address from DN-AAA server TS 29.561CR0034
- SMF to request the UE IP address from the DN-AAA server based on subscription information TS 23.501CR2224
- Replace DN with better identifier for whitelists and blacklists management TS 28.541CR0260
- List of allowed VLAN Ids within DN authorization data TS 29.561CR0048
+ 3 more changes
In Release 17, the enhancements for the Distinguished Name (DN) function focused on expanding the information reported to DN-AAA servers for secondary authentication and authorization. This included new capabilities to report the Session S-NSSAI, FQDN of the CHF or Serving NF, UE local IP address, and DNAI to both RADIUS and Diameter-based DN-AAA servers. The release also introduced procedures for DN-AAA server selection during UE onboarding and without DCS involvement, and specified mechanisms for DN-AAA initiated re-authentication, including scenarios where the UE is unreachable.
- Encoding of API-based DN-AA TS 24.501CR3103
- Adding a note for IPv4/IPv6 Non-transparent access to DN using PAP/CHAP TS 29.561CR0058
- Reporting Session S-NSSAI to RADIUS DN-AAA server TS 29.561CR0077
- Reporting Session S-NSSAI to Diameter DN-AAA server TS 29.561CR0078
- Reporting FQDN of CHF to RADIUS DN-AAA server TS 29.561CR0079
- Reporting FQDN of CHF to Diameter DN-AAA server TS 29.561CR0080
+ 17 more changes
In Release 18, the enhancements for the Distinguished Name (DN) function specifically introduced procedures for secondary DN authentication and authorization in EPS interworking scenarios. These updates addressed the use case of EPS interworking, building upon the existing framework. The changes focused on refining the authentication and authorization mechanisms when a secondary DN is involved during inter-system mobility.
In Release 19, enhancements for the Distinguished Name (DN) function included the introduction of a new DN energy analytics service, complete with its own service procedure and API. Additionally, updates were made to the accounting report sent to the DN-AAA server, and support for VLAN handling information was added within SM subscription data and the DN-AAA interface.
Explore further
Broader topics and technologies where DN plays a role.
Defining Specifications
3GPP specifications that define or reference DN, with the latest known release. Sourced from the 3GPP document catalog — see methodology.
| Specification | Title | Release |
|---|---|---|
| TR 21.905 vj00 | 3GPP Technical Terms and Definitions | Rel-19 |
| TS 22.066 vj00 | Mobile Number Portability Stage 1 | Rel-19 |
| TR 22.975 v1310 | UMTS Numbering and Addressing Requirements | Rel-4 |
| TS 23.292 vj00 | IMS Centralized Services (ICS) Architecture | Rel-19 |
| TS 23.501 vk00 | 5G System Architecture Stage 2 | Rel-20 |
| TS 23.558 vk00 | Architecture for Edge Applications | Rel-20 |
| TS 23.700 vk00 | XR Services Application Enablement Layer | Rel-20 |
| TS 23.791 vg20 | NWDAF Data Collection & Analytics Framework | Rel-16 |
| TS 24.229 vj50 | IMS call control protocol based on SIP and SDP | Rel-19 |
| TS 24.292 vj00 | IMS Centralized Services (ICS) Protocol | Rel-19 |
| TS 24.501 vj50 | 5G NAS Protocols Specification | Rel-19 |
| TS 24.554 vj40 | 5G Proximity Services (ProSe) Protocols | Rel-19 |
| TS 24.890 vg00 | 5G NAS Protocol for 5GS Stage 3 | Rel-16 |
| TS 26.501 vj30 | 5G Media Streaming (5GMS) Architecture | Rel-19 |
| TS 26.502 vj30 | 5G Multicast-Broadcast User Services Architecture | Rel-19 |
| TS 26.510 vj10 | Media Delivery APIs for 5GMS and RTC Systems | Rel-19 |
| TS 26.531 vj00 | Data Collection & Reporting Architecture for 5G | Rel-19 |
| TR 26.941 vj01 | 5G Media Slicing Extensions | Rel-19 |
| TS 28.309 vj00 | QoE Measurement Collection IRP Solution Set | Rel-19 |
| TS 28.530 vj00 | Network Slicing Concepts & Requirements | Rel-19 |
| TS 28.538 vj40 | Edge Computing Management (ECM) | Rel-19 |
| TS 28.541 vk00 | 5G Network Resource Model (NRM) Stage 2/3 | Rel-20 |
| TS 28.606 vc10 | CN and non-3GPP interworking NRM IRP Solution Sets | Rel-12 |
| TS 28.612 vj00 | EPC and non-3GPP interworking NRM IRP IS | Rel-19 |
| TS 28.616 vj00 | EPC and non-3GPP access NRM IRP SS definitions | Rel-19 |
| TS 28.620 vj20 | FMC Federated Network Information Model (FNIM) UIM | Rel-19 |
| TS 28.622 vk20 | Telecommunication Management; Generic NRM Information Service | Rel-20 |
| TS 28.632 vj00 | Inventory Management NRM Integration Reference Point | Rel-19 |
| TS 28.652 vj00 | UTRAN Network Resource Model (NRM) IRP Information Service | Rel-19 |
| TS 28.653 vj00 | UTRAN NRM IRP Solution Set Definition | Rel-19 |
| TS 28.655 vj00 | GERAN NRM IRP Information Service | Rel-19 |
| TS 28.656 vj00 | GERAN NRM IRP Solution Set Definitions | Rel-19 |
| TS 28.658 vj00 | E-UTRAN NRM IRP Information Service | Rel-19 |
| TS 28.659 vj00 | E-UTRAN NRM IRP Solution Set Definitions | Rel-19 |
| TS 28.662 vj10 | Generic RAN Network Resource Model (NRM) IRP IS | Rel-19 |
| TS 28.672 vj00 | HNS NRM IRP Information Service | Rel-19 |
| TS 28.673 vj00 | HNS NRM IRP Solution Set Definitions | Rel-19 |
| TS 28.676 vj00 | HeNS NRM IRP Solution Set Definitions | Rel-19 |
| TS 28.702 vj00 | Core Network NRM IRP Information Service | Rel-19 |
| TS 28.703 vj00 | Core Network NRM IRP Solution Set Definitions | Rel-19 |
| TS 28.705 vj00 | IMS NRM IRP Information Service | Rel-19 |
| TS 28.706 vj00 | IMS NRM IRP Solution Set definitions | Rel-19 |
| TS 28.709 vj00 | EPC NRM IRP Solution Set Definitions | Rel-19 |
| TS 28.732 vj00 | Transport Network NRM IRP Information Service | Rel-19 |
| TS 28.733 vj00 | TN NRM IRP Solution Set Definitions | Rel-19 |
| TS 28.735 vj00 | STN Interface NRM IRP Information Service | Rel-19 |
| TS 28.736 vj00 | STN Interface NRM IRP Solution Set Definitions | Rel-19 |
| TS 28.821 vd00 | UML Model Repertoire for FMC Management | Rel-13 |
| TR 28.833 vi01 | Technical Report on 5G LAN-type Service Management | Rel-18 |
| TS 29.522 vj40 | 5G NEF Northbound APIs Stage 3 | Rel-19 |
| TS 29.549 vj40 | SEAL API Specification for Vertical Applications | Rel-19 |
| TS 29.558 vj40 | Enabling Edge Applications | Rel-19 |
| TS 29.561 vj30 | 5G Interworking with External Data Networks | Rel-19 |
| TS 29.890 vg00 | CT3 5G System Technical Report | Rel-16 |
| TS 32.107 vj00 | Federated Network Information Model (FNIM) | Rel-19 |
| TS 32.111 vj00 | Fault Management Requirements | Rel-19 |
| TS 32.152 ve10 | IRP Information Service UML Repertoire | Rel-14 |
| TS 32.158 vk00 | Management and Orchestration REST Solution Sets | Rel-20 |
| TS 32.250 vj00 | Circuit Switched Offline Charging | Rel-19 |
| TS 32.300 vj00 | 3GPP Network Resource Naming Convention | Rel-19 |
| TS 32.302 vj00 | Notification IRP Information Service | Rel-19 |
| TS 32.312 vj00 | Generic IRP Management Information Service | Rel-19 |
| TS 32.332 vj00 | Notification Log IRP Information Service | Rel-19 |
| TS 32.343 v1900 | File Transfer IRP CORBA Solution Set | Rel-9 |
| TS 32.346 vj00 | File Transfer IRP Solution Set Definitions | Rel-19 |
| TS 32.352 vj00 | Communication Surveillance IRP Information Service | Rel-19 |
| TS 32.353 v1900 | Communication Surveillance IRP CORBA Solution Set | Rel-9 |
| TS 32.356 vj00 | Communication Surveillance IRP Solution Set | Rel-19 |
| TS 32.361 vj00 | Entry Point IRP Requirements | Rel-19 |
| TS 32.362 vj00 | Entry Point IRP Information Service | Rel-19 |
| TS 32.363 v900 | EP IRP CORBA Solution Set | Rel-9 |
| TS 32.366 vj00 | EP IRP Solution Set definitions | Rel-19 |
| TS 32.413 v900 | PM IRP: CORBA Solution Set (SS) | Rel-9 |
| TS 32.416 vj00 | PM IRP Solution Set Definitions | Rel-19 |
| TS 32.443 v910 | Trace Management IRP CORBA Solution Set | Rel-9 |
| TS 32.446 vj00 | Trace Management IRP Solution Set Definitions | Rel-19 |
| TS 32.602 vj00 | Basic Configuration Management IRP Information Service | Rel-19 |
| TS 32.603 v910 | Basic CM IRP CORBA Solution Set | Rel-9 |
| TS 32.606 vj00 | Basic CM IRP Solution Set for CORBA/SOAP | Rel-19 |
| TS 32.607 v1910 | CM IRP SOAP Solution Set Mapping | Rel-9 |
| TS 32.613 v1910 | Bulk CM IRP CORBA Solution Set | Rel-9 |
| TS 32.615 v1920 | Bulk CM XML File Format Definition | Rel-9 |
| TS 32.616 vj00 | Bulk CM IRP Solution Set Definitions | Rel-19 |
| TS 32.622 vb10 | Generic Network Resources IRP NRM | Rel-11 |
| TS 32.623 v900 | Generic NRM CORBA Solution Set | Rel-9 |
| TS 32.626 vb20 | Generic Network Resources IRP Solution Set Definitions | Rel-11 |
| TS 32.632 vb00 | Core Network Resources IRP: Network Resource Model | Rel-11 |
| TS 32.633 v1920 | Core Network Resources IRP CORBA Mapping | Rel-9 |
| TS 32.636 vb00 | CM Core Network Resources IRP Solution Set | Rel-11 |
| TS 32.642 vb50 | UTRAN Network Resource Model for Configuration Management | Rel-11 |
| TS 32.643 v930 | UTRAN Network Resources IRP: CORBA Solution Set | Rel-9 |
| TS 32.646 vc00 | UTRAN NRM IRP Solution Set Definitions | Rel-12 |
| TS 32.652 vc00 | GERAN Network Resources NRM for Configuration Management | Rel-12 |
| TS 32.653 v920 | GERAN Network Resources IRP CORBA Solution Set | Rel-9 |
| TS 32.656 vc00 | GERAN NRM IRP Solution Set Definitions | Rel-12 |
| TS 32.662 vj00 | Configuration Management (CM); Kernel CM IRP | Rel-19 |
| TS 32.663 v1900 | Kernel CM IRP CORBA Mapping | Rel-9 |
| TS 32.666 vj00 | Kernel CM IRP Solution Set Definitions | Rel-19 |
| TS 32.667 v1900 | Kernel CM IRP SOAP Solution Set | Rel-9 |
| TS 32.692 vb00 | Inventory Management NRM IRP Specification | Rel-11 |
| TS 32.712 vb10 | Transport Network Interface NRM for CM | Rel-11 |
| TS 32.713 v900 | TN Interface NRM IRP: CORBA Solution Set | Rel-9 |
| TS 32.716 vb00 | TN NRM IRP Solution Set Definitions | Rel-11 |
| TS 32.722 vb00 | Repeater NRM IRP: Network Resource Model | Rel-11 |
| TS 32.723 v900 | Repeater NRM CORBA Solution Set | Rel-9 |
| TS 32.726 vb00 | Repeater NRM IRP Solution Set Definitions | Rel-11 |
| TS 32.732 vb00 | IMS Network Resource Model IRP: Information Service | Rel-11 |
| TS 32.733 v910 | IMS NRM IRP CORBA Solution Set | Rel-9 |
| TS 32.736 vb00 | IMS NRM IRP Solution Set Definitions | Rel-11 |
| TS 32.742 vb00 | STN NRM for Configuration Management | Rel-11 |
| TS 32.743 v1900 | CORBA Solution Set for STN IRP | Rel-9 |
| TS 32.746 vb00 | STN NRM IRP Solution Set Definitions | Rel-11 |
| TS 32.753 v920 | EPC NRM IRP CORBA Solution Set | Rel-9 |
| TS 32.756 vb00 | EPC NRM IRP Solution Set Definitions | Rel-11 |
| TS 32.762 vb70 | E-UTRAN NRM IRP Information Service | Rel-11 |
| TS 32.763 v1950 | E-UTRAN NRM IRP CORBA Solution Set | Rel-9 |
| TS 32.766 vb90 | E-UTRAN NRM IRP Solution Set Definitions | Rel-11 |
| TS 32.772 vb00 | HNS Network Resource Model (NRM) IRP | Rel-11 |
| TS 32.773 v900 | HNS NRM IRP CORBA Solution Set | Rel-9 |
| TS 32.776 vb00 | HNS NRM IRP Solution Set Definitions | Rel-11 |
| TS 32.783 v1900 | HeNS NRM IRP CORBA Solution Set | Rel-9 |
| TS 32.786 vb00 | 3GPP TS 32.786: HeNS NRM IRP Solution Set | Rel-11 |
| TS 32.792 vb10 | Generic RAN Network Resource Model (NRM) IRP | Rel-11 |
| TS 32.832 va00 | Alarm Correlation and Root Cause Analysis Study | Rel-10 |
| TS 32.851 vc20 | Network Sharing OAM Requirements | Rel-12 |
| TS 32.899 vf10 | 5G Charging Architecture Study | Rel-15 |
| TS 33.127 vj50 | Lawful Interception Architecture and Functions | Rel-19 |
| TS 33.501 vk00 | 5G Security Architecture and Procedures | Rel-20 |
| TR 33.882 vi01 | Technical Report on 5G Security for Personal IoT Networks | Rel-18 |