• Introduction
• gNBSim Block Diagram
• Supported Features
• Pending Features
• Support & Contributions
• License
• Deployment model
• Configuration
• Advanced Configuration/Features
  • API Based Configuration
  • Data Support
  • Message Flow
  • Profile Details
  • UE Originated Message Flow
  • UE Terminated Message Flow

This repository is part of the SD-Core project. SD-Core is open source 5G implementation of 5G Core Network. SD-Core provides a tool to simulate gNodeB and UE by generating NAS and NGAP messages for the configured UEs and call flows.

Supported 3gpp procedures:

• UE Registration
• UE Initiated PDU Session Establishment
• UE Initiated De-registration
• AN Release
• UE Initiated Service Request
• N/W triggered PDU Session Release
• UE Requested PDU Session Release
• N/W requested PDU Session Modification
• UE Requested PDU Session Modification (request and reject; the accept path is not modelled)
• N/W triggered UE Deregistration
• Support for N2 handover profile

Supported System level features

• Gnbsim can generate and send user data packets (ICMP echo request) and process downlink user data (ICMP echo response) over the established data plane path (N3 Tunnel)
• Executing all enabled profiles in parallel or in sequential order
• Timeout for each call flow within profile
• Logging summary result
• HTTP API to execute profile
• Configure number of data packets to be sent and time interval between consecutive packets
• Configure AS (Application Server) address. This is used to send data packets
• Run gNBSim with single Interface or multi interface
• Support of Custom Profiles
• Delay between Procedures
• Timeout for every profile
• Logic to calculate latency per transaction/ operation
• Support retransmission of Service Request Message
• Configurable refusal of a PDU Session Modification, either for named QoS flows or for the whole session, and withholding the PDU Session Modification Complete
• Support deployment of gNBSim as standalone container
• Reporting profile errors from all levels

• Provision data interface to gNBSim Container/POD/executable for data traffic testing
• [3gpp] Generating GTPU echo request & handle incoming GTPU response
• [3gpp] Handle incoming GTPu echo request & generate GTPu echo response
• [3gpp] Support to send Error indication Message
• [3gpp] Adding support for handling End Marker packet
• [3gpp] GUTI based registration
• [3gpp] Adding support for Resynchronization Profile
• Support to handle Paging Request
• Controlling Profiles - Adding support for aborting profile
• Controlling Profiles - Suspend & resume profiles
• Adding support for configurable rate of events
• HTTP APIs to fetch subscriber/profile status from gNBSim
• Adding Support for Xn Handover profile
• Dropping incoming messages based on configuration
• Sending negative responses to request/command type messages based on configuration
• Handling security mode failure message
• Triggering downlink data from gNB Sim (CI/CD feature as well)
• UI Support
• 3gpp Release Upgrade
• Extensive gnbsim documentation
• Command line options to send logs and/or events to file in specific format for post processing.

The gnbsim project welcomes new contributors. Feel free to propose a new feature or fix bugs!

Before contributing, please follow these guidelines:

1. gNBSim documentation details here
2. Please refer to the official SD-Core documentation for more details.
3. #sdcore-dev channel in ONF Community Slack
4. Raise Github issues

The project is licensed under the Apache License, version 2.0.