srsLTE

srsLTE is a free and open-source LTE software suite developed by SRS (www.softwareradiosystems.com).

It includes:

srsUE - a complete SDR LTE UE application featuring all layers from PHY to IP
srsENB - a complete SDR LTE eNodeB application
srsEPC - a light-weight LTE core network implementation with MME, HSS and S/P-GW
a highly modular set of common libraries for PHY, MAC, RLC, PDCP, RRC, NAS, S1AP and GW layers.

srsLTE is released under the AGPLv3 license and uses software from the OpenLTE project (http://sourceforge.net/projects/openlte) for some security functions and for NAS message parsing.

Common Features

LTE Release 10 aligned
Tested bandwidths: 1.4, 3, 5, 10, 15 and 20 MHz
Transmission mode 1 (single antenna), 2 (transmit diversity), 3 (CCD) and 4 (closed-loop spatial multiplexing)
Frequency-based ZF and MMSE equalizer
Evolved multimedia broadcast and multicast service (eMBMS)
Highly optimized Turbo Decoder available in Intel SSE4.1/AVX2 (+100 Mbps) and standard C (+25 Mbps)
MAC, RLC, PDCP, RRC, NAS, S1AP and GW layers
Detailed log system with per-layer log levels and hex dumps
MAC layer wireshark packet capture
Command-line trace metrics
Detailed input configuration files
Channel simulator for EPA, EVA, and ETU 3GPP channels
ZeroMQ-based fake RF driver for I/Q over IPC/network

srsUE Features

FDD and TDD configuration
Carrier Aggregation support
Cell search and synchronization procedure for the UE
Soft USIM supporting Milenage and XOR authentication
Hard USIM support using PCSC framework
Virtual network interface tun_srsue created upon network attach
150 Mbps DL in 20 MHz MIMO TM3/TM4 configuration in i7 Quad-Core CPU.
75 Mbps DL in 20 MHz SISO configuration in i7 Quad-Core CPU.
36 Mbps DL in 10 MHz SISO configuration in i5 Dual-Core CPU.

srsUE has been fully tested and validated with the following network equipment:

Amarisoft LTE100 eNodeB and EPC
Nokia FlexiRadio family FSMF system module with 1800MHz FHED radio module and TravelHawk EPC simulator
Huawei DBS3900
Octasic Flexicell LTE-FDD NIB

srsENB Features

FDD configuration
Round Robin MAC scheduler with FAPI-like C++ API
SR support
Periodic and Aperiodic CQI feedback support
Standard S1AP and GTP-U interfaces to the Core Network
150 Mbps DL in 20 MHz MIMO TM3/TM4 with commercial UEs
75 Mbps DL in SISO configuration with commercial UEs
50 Mbps UL in 20 MHz with commercial UEs
User-plane encryption

srsENB has been tested and validated with the following handsets:

LG Nexus 5 and 4
Motorola Moto G4 plus and G5
Huawei P9/P9lite, P10/P10lite, P20/P20lite
Huawei dongles: E3276 and E398

srsEPC Features

Single binary, light-weight LTE EPC implementation with:
- MME (Mobility Management Entity) with standard S1AP and GTP-U interface to eNB
- S/P-GW with standard SGi exposed as virtual network interface (TUN device)
- HSS (Home Subscriber Server) with configurable user database in CSV format
Support for paging

Hardware

The library currently supports the Ettus Universal Hardware Driver (UHD) and the bladeRF driver. Thus, any hardware supported by UHD or bladeRF can be used. There is no sampling rate conversion, therefore the hardware should support 30.72 MHz clock in order to work correctly with LTE sampling frequencies and decode signals from live LTE base stations.

We have tested the following hardware:

USRP B210
USRP B205mini
USRP X300
limeSDR
bladeRF

Build Instructions

Mandatory requirements:
- Common:
  - cmake https://cmake.org/
  - libfftw http://www.fftw.org/
  - PolarSSL/mbedTLS https://tls.mbed.org
- srsUE:
  - Boost: http://www.boost.org
- srsENB:
  - Boost: http://www.boost.org
  - lksctp: http://lksctp.sourceforge.net/
  - config: http://www.hyperrealm.com/libconfig/
- srsEPC:
  - Boost: http://www.boost.org
  - lksctp: http://lksctp.sourceforge.net/
  - config: http://www.hyperrealm.com/libconfig/

For example, on Ubuntu 17.04, one can install the required libraries with:

sudo apt-get install cmake libfftw3-dev libmbedtls-dev libboost-program-options-dev libconfig++-dev libsctp-dev

or on Fedora:

dnf install cmake fftw3-devel polarssl-devel lksctp-tools-devel libconfig-devel boost-devel

Note that depending on your flavor and version of Linux, the actual package names may be different.

Optional requirements:
- srsgui: https://github.com/srslte/srsgui - for real-time plotting.
- libpcsclite-dev: https://pcsclite.apdu.fr/ - for accessing smart card readers
RF front-end driver:
- UHD: https://github.com/EttusResearch/uhd
- SoapySDR: https://github.com/pothosware/SoapySDR
- BladeRF: https://github.com/Nuand/bladeRF
- ZeroMQ: https://github.com/zeromq

Download and build srsLTE:

git clone https://github.com/srsLTE/srsLTE.git
cd srsLTE
mkdir build
cd build
cmake ../
make
make test

Install srsLTE:

sudo make install
sudo srslte_install_configs.sh

This installs srsLTE and also copies the default srsLTE config files to the user's home directory (~/.srs).

Execution Instructions

The srsUE, srsENB and srsEPC applications include example configuration files that should be copied (manually or by using the convenience script) and modified, if needed, to meet the system configuration. On many systems they should work out of the box.

By default, all applications will search for config files in the user's home directory (~/.srs) upon startup.

Note that you have to execute the applications with root privileges to enable real-time thread priorities and to permit creation of virtual network interfaces.

srsENB and srsEPC can run on the same machine as a network-in-the-box configuration. srsUE needs to run on a separate machine.

If you have installed the software suite using sudo make install and have installed the example config files using sudo srslte_install_configs.sh, you may just start all applications with their default parameters.

srsEPC

On machine 1, run srsEPC as follows:

sudo srsepc

Using the default configuration, this creates a virtual network interface named "srs_spgw_sgi" on machine 1 with IP 172.16.0.1. All connected UEs will be assigned an IP in this network.

srsENB

Also on machine 1, but in another console, run srsENB as follows:

sudo srsenb

srsUE

On machine 2, run srsUE as follows:

sudo srsue

Using the default configuration, this creates a virtual network interface named "tun_srsue" on machine 2 with an IP in the network 172.16.0.x. Assuming the UE has been assigned IP 172.16.0.2, you may now exchange IP traffic with machine 1 over the LTE link. For example, run a ping to the default SGi IP address:

ping 172.16.0.1

Support

Mailing list: http://www.softwareradiosystems.com/mailman/listinfo/srslte-users

rekitto/srsLTE