NFPCF - NF Profile Cache Function

NFPCF is a caching proxy for the NRF (Network Repository Function) in 5G core networks. It caches NF profiles to reduce load on the backend NRF and improve discovery performance.

Features

• NF Registration: Transparent pass-through to backend NRF with caching
• NF Discovery: Cache-first lookup with NRF fallback
• NF Deregistration: Cache invalidation with NRF pass-through
• NF Update: Cache invalidation with NRF pass-through
• TTL-based Cache: Automatic expiration of stale entries
• Type Indexing: Fast lookup by NF type

Architecture

┌──────────────┐
│  NF Clients  │
│ (AMF/SMF/...) │
└──────┬───────┘
       │
       ▼
┌──────────────────┐
│     NFPCF        │
│  ┌────────────┐  │
│  │   Cache    │  │
│  └────────────┘  │
└──────┬───────────┘
       │
       ▼
┌──────────────────┐
│       NRF        │
└──────────────────┘

Build

make build

Run

make run

Or manually:

./bin/nfpcf -c ./config/nfpcfcfg.yaml

Configuration

Edit config/nfpcfcfg.yaml:

server:
  bindAddr: 0.0.0.0:8000

nrf:
  url: http://nrf:8000

cache:
  ttl: 300000000000  # 5 minutes in nanoseconds

logger:
  level: info

Docker

Build:

docker build -t nfpcf:latest .

Run:

docker run -p 8000:8000 \
  -e NRF_URL=http://nrf:8000 \
  nfpcf:latest

API Endpoints

NF Management

• PUT /nnrf-nfm/v1/nf-instances/:nfInstanceID - Register NF
• GET /nnrf-nfm/v1/nf-instances/:nfInstanceID - Get NF profile
• DELETE /nnrf-nfm/v1/nf-instances/:nfInstanceID - Deregister NF
• PATCH /nnrf-nfm/v1/nf-instances/:nfInstanceID - Update NF

NF Discovery

• GET /nnrf-disc/v1/nf-instances?target-nf-type=... - Discover NFs

Testing

Point your NF clients to NFPCF instead of NRF:

# In AMF/SMF config
nrfUri: http://nfpcf:8000

License

Same as free5GC project