OpenAirInterface Session Management Function (SMF) Feature Set¶
1. 5GC Service Based Architecture¶
2. OAI SMF Available Interfaces¶
| ID | Interface | Status | Comment |
|---|---|---|---|
| 1 | N4 | ✅ | between SMF and UPF (PFCP) |
| 2 | N7 | ✅ | between SMF and PCF |
| 3 | N10 | ✅ | between SMF and UDM (Nudm_SubscriberDataManagement) |
| 4 | N11 (*) | ✅ | between SMF and AMF (Nsmf_PDU_Session Services, Namf_N1N2MessageTransfer) |
| 5 | N16/16a | ❌ | between SMFs |
All interfaces support both HTTP/1.1 and HTTP/2
3. OAI SMF Feature List¶
Based on document 3GPP TS 23.501 v16.0.0 (Section 6.2.2).
| ID | Classification | Status | Comments |
|---|---|---|---|
| 1 | Session Management (Session Establishment/Modification/Release) | ✅ | |
| 2 | UE IP address allocation & management | ✅ | IP Address pool is controlled by SMF |
| 3 | DHCPv4 (server and client) and DHCPv6 (server and client) function | ❌ | |
| 4 | Respond to ARP requests and/or IPv6 Neighbour Solicitation requests | ❌ | |
| 5 | Selection of UPF function | ✅ | Local configuration/UPF discovery via NRF |
| 6 | Configures traffic steering at UPF | ✅ | Based on traffic rules from PCF |
| 7 | Termination of interfaces towards PCFs | ✅ | Only supporting traffic rules |
| 8 | Lawful intercept | ❌ | |
| 9 | Charging data collection and support of charging interfaces | ❌ | |
| 10 | Termination of SM parts of NAS messages | ✅ | |
| 11 | Downlink Data Notification | ✅ | |
| 12 | Determine SSC mode of a session | ✅ | Only support SSC mode 1 |
| 13 | Initiator of AN specific SM information, sent via AMF over N2 to AN | ✅ | |
| 14 | Support for Control Plane CIoT 5GS Optimisation | ❌ | |
| 15 | Support of header compression | ❌ | |
| 16 | Act as I-SMF in deployments | ❌ | |
| 17 | Provisioning of external parameters | ❌ |