Feature Set

Overview

UERANSIM implements the following technologies:

1. 5G Standalone UE
2. 5G Standalone RAN (CU gNB)

In basic terms, UE can be considered as a mobile phone and RAN as the base station.

Interfaces

There are 3 main interface in UE/RAN perspective:

1. Control Interface (between RAN and AMF)
2. User Interface (between RAN and UPF)
3. Radio Interface (between UE and RAN)

Control Plane

Control Plane has 2 interfaces:

1. NAS is in control of UE
2. NGAP is in control of RAN.

NAS Features

We implemented the following features:

• Primary Authentication and Key Agreement
• Security Mode Control
• Identification
• Generic UE Configuration Update
• Initial and Periodic Registration
• UE and Network initiated De-registration
• UE initiated PDU session establishment

Following features are not implemented yet:

• e-Call Inactivity, Service Request, Paging, Notification
• PDU session authorization, modification, release

For NAS security,

• All integrity and ciphering algorithms are implemented. (IA1, IA2, IA3, EA1, EA2, EA3)
• All primary authentication and key agreement procedures are implemented. (5G AKA, EAP AKA')

For identification,

• NAI and ciphered SUCI are not implemented yet.

NGAP Features

Following features are implemented in NGAP layer:

• PDU Session Resource Setup
• Initial Context Setup
• UE Context Release (AMF initiated)
• UE Context Modification
• Initial UE Message
• Downlink NAS Transport
• Uplink NAS Transport
• NAS Non Delivery Indication
• Reroute NAS Request
• NG Setup
• Error Indication

User Plane

Our RAN implements GTP protocol for user plane.

Radio Interface

Here's the current status in summary of the 5G New Radio stack:

1. PHY: Waiting
2. MAC: Waiting
3. RLC: Complete
4. PDCP: In Progress 5.1. RRC: In Progress 5.2. SDAP: Waiting