Wireless 5G Core Network

IP Network Simulation

5G N13 Interface Emulation

MAPS™ 5G-N13 can emulate and test Authentication Server Function (AUSF) and User Data Management (UDM) elements via the Nausf service-based N13 interface.

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MAPS™ 5G N13 Interface Simulation


GL's Message Automation & Protocol Simulation (MAPS™) 5G System as a service-based architecture, includes a set of Network Functions (NFs) providing services as defined in 3GPP standards. The service-based interfaces use HTTP/2 protocol with JavaScript Object Notation (JSON) as the application layer serialization protocol.

MAPS™ 5G N13 interface can emulate Authentication Server Function (AUSF), within the 5G Core Network offering services to User Data Management (UDM) via the Nausf and Nudm service-based N13 interface respectively

MAPS™ N13 Interface Emulator supported Procedures are -

  • Nudm_UEAuthentication Services: Get and ResultConfirmation operations

GL has enhanced its MAPS™ protocol emulation tool to emulate multi-protocol and multi-interface offering a complete range of test solutions, covering the entire 5G, 4G, 3G and 2G network.

By mimicking real-world customer behavior in lab environments, our solutions allow mobile operators and equipment manufacturers to verify their 5G networks before deployment.

GL also provides a GUI based Multi-Protocol Analyzer for online capture and decode of the signaling in real-time both during tests and as a stand-alone tracer for live systems.

Main Features

  • Emulates Authentication Server Function (AUSF) and Unified Data Management (UDM) elements
  • Supports Nudm_UEAuthentication Services Procedure
  • Services use REST APIs based on HTTP and JSON data format
  • Supports TLS and TCP transports
  • Supports scripted call generation and automated call reception
  • Supports customization of call flow and message templates to create valid and invalid scenarios
  • Ready-to-use scripts for quick testing
  • Provides Call Statistics and Events Status
  • Emulates Multiple Subscribers using CSV Profiles
  • Automation, Remote access, and Schedulers to run tests 24/7

Supported Protocols Standards

Protocols Standards

Protocols Standards

Supported Protocols
Standard / Specification

N13 Interface (UDM - AUSF)

TS29.509 Release 17

JavaScript Object Notation (JSON)



IETF RFC 7540/RFC 7541






IETF RFC 791 [5]
IETF RFC 2460 [6]

Use Cases

MAPS™ N13 configured as AUSF to test UDM (DUT)

MAPS™ N13 configured as AUSF to test UDM (DUT)

MAPS™ N13 configured as UDM to test AUSF (DUT)

MAPS™ N13 configured as UDM to test AUSF (DUT)

5G N13 Interface Procedures

In 5G N13 interface, MAPS™ acts as either UDM to test AUSF or AUSF to test UDM emulating the following procedure.

  • Nudm_UEAuthentication Services
Authentication Information Retrieval

Authentication Information Retrieval

Authentication Confirmation

Authentication Confirmation

Authentication Result Removal

Authentication Result Removal

The below figures depict the Call Generation and Reception of 5G N13 interface between UDM and AUSF.

Call Generation at AUSF Node

Call Generation at AUSF Node

Call Reception at UDM Node

Call Reception at UDM Node


Please Note: The XX in the Item No. refers to the hardware platform, listed at the bottom of the Buyer's Guide, which the software will be running on. Therefore, XX can either be ETA or EEA (Octal/Quad Boards), PTA or PEA (tProbe Units), UTA or UEA (USB Units), HUT or HUE (Universal Cards), and HDT or HDE (HD cards) depending upon the hardware.