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OpenAirInterface Core Network Feature Set

Table of Contents

  1. OpenAirInterface Core Network Block Diagram
  2. OpenAirInterface Core Network Fundamentals
  3. OpenAirInterface Core Network Deployment
  4. OpenAirInterface SPGW-CUPS Fundamentals
  5. OpenAirInterface SGW Feature List
  6. OpenAirInterface PGW Feature List

1. OpenAirInterface Core Network Block Diagram

Block Diagram

2. OAI Core Network Fundamentals

  • Network Access Control Functions
    • Authentication and authorization
    • Admission control
    • Policy and charging enforcement
  • Packet Routing and Transfer Functions
    • IP header compression function
    • Packet screening.
  • Mobility Management Functions
    • Reachability management for UE in ECM IDLE state
  • Security Functions
  • Radio Resource Management Functions
  • Network Management Functions (O&M)
    • GTP C signaling based Load and Overload Control
    • Load balancing between MME instances
    • MME control of overload
    • PDN Gateway control of overload

3. OAI Core Network Deployment

  • Target OS
    • Ubuntu 18.04 (bionic) server edition
    • Red Hat Entreprise Linux 8
  • Hardware Requirements
    • x86-64 Intel/AMD CPU
    • At least one 1 network device
  • Linux Kernel
    • Generic kernel is enough
  • Deployment feasible on:
    • PC
    • Server
    • Container
    • Virtual Machine

We strongly recommend a container-based deployment (either in a docker-compose fashion, or in a Kubernetes-like cluster).

4. OAI SPGW-CUPS Fundamentals

CUPS = Control-User Planes Separation

So SPGW is composed of almost 2 network functions:

  • 1 SPGW-C
  • 1 SPGW-U

Multiple instances of SPGW-U may be connected to a single instance of SPGW-C.

Fully written in C++ (-std=c++17)

  • Internal design still asynchronous (ITTI based API)
  • Usage of submodules: spdlog, libfolly (nolock collections)

Main differences with previous SPGW (tag v0.7.0)

  • Handles GTP fragmentation
  • Enables Network Address Translation (NAT), based on iptables
  • Easier to install (no kernel dependencies)
  • Switch-talking natively PFCP
  • Data is copied/handled in user space