srsRAN Base Station Overview

⚠️ RF Compliance Warning

Before using SDR for radio transmission, please read RF Regulations & Compliance.

Under China's Public Security Administration Punishments Law (effective January 1, 2026), setting up base stations without approval may result in 5-15 days detention! Please use an RF shielded box or cable connection for experiments.

srsRAN Project is an open-source 5G RAN implementation providing 3GPP compliant gNB and UE.

Project Architecture

                    srsRAN Project
                         │
           ┌─────────────┴─────────────┐
           │                           │
      ┌────▼────┐                ┌─────▼────┐
      │  srsGNB │                │  srsUE   │
      │ (gNodeB)│                │  (UE)    │
      └────┬────┘                └──────────┘
           │
    ┌──────┴──────┐
    │             │
┌───▼───┐    ┌────▼────┐
│  DU   │    │   CU    │
│(Distr.│    │(Central │
│ Unit) │    │  Unit)  │
└───────┘    └─────────┘

Main Components

srsGNB (gNodeB)

5G NR base station implementation supporting:

Feature	Description
5G SA	Standalone mode
N2/N3 Interface	5GC connection
Multiple SDRs	USRP, BladeRF, ZMQ
Multi-band	Sub-6 GHz
MIMO	Up to 4x4

srsUE

5G user terminal implementation:

Feature	Description
5G SA	Standalone mode
NAS	Complete NAS layer
PDU Session	Data session support

System Requirements

Hardware Requirements

Component	Minimum	Recommended
CPU	4-core x86_64	8+ cores, AVX2
RAM	8 GB	16+ GB
SDR	USRP B210	USRP X310/N310

Software Requirements

• Ubuntu 22.04 LTS
• CMake 3.14+
• GCC 10+
• UHD 4.0+ (for USRP)

Supported SDRs

SDR	Interface	Bandwidth	Status
USRP B210	USB 3.0	56 MHz	✅ Full support
USRP X310	10GbE	200 MHz	✅ Full support
USRP N310	10GbE	100 MHz	✅ Full support
BladeRF	USB 3.0	40 MHz	⚠️ Experimental
ZMQ	Virtual	-	✅ Simulation

Supported Bands

Band	Frequency Range	Duplex	Status
n78	3300-3800 MHz	TDD	✅
n77	3300-4200 MHz	TDD	✅
n41	2496-2690 MHz	TDD	✅
n3	1805-1880 MHz	FDD	✅
n1	1920-2170 MHz	FDD	✅

Integration with Open5GS

srsRAN gNB connects to Open5GS via N2/N3 interfaces:

┌─────────────┐         ┌─────────────┐
│   srsGNB    │───N2───▶│    AMF      │
│             │  SCTP   │  (Open5GS)  │
└──────┬──────┘         └─────────────┘
       │
       │ N3
       │ GTP-U
       │
┌──────▼──────┐
│    UPF      │
│  (Open5GS)  │
└─────────────┘

Next Steps

• Installation - Compile and install srsRAN
• gNB Configuration - Configure base station
• UE Configuration - Configure software UE