srsLTE is a free and open-source LTE library for SDR UE and eNodeB developed by SRS (www.softwareradiosystems.com). The library is highly modular with minimum inter-module or external dependencies. It is entirely written in C and, if available in the system, uses the acceleration library VOLK distributed in GNURadio.
srsLTE is a free and open-source LTE software suite developed by SRS (www.softwareradiosystems.com).
**srsLTE is used by srsUE, a full stack (PHY to IP) implementation of an LTE UE. srsUE is available at https://github.com/srslte/srsue**
It includes:
* srsUE - a complete SDR LTE UE application featuring all layers from PHY to IP
* srsENB - a complete SDR LTE eNodeB application
* 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 RRC/NAS message parsing.
The srsLTE software license is AGPLv3.
Common Features
---------------
Current Features:
* LTE Release 8 compliant
* FDD configuration
* Tested bandwidths: 1.4, 3, 5, 10, 15 and 20 MHz
* Transmission mode 1 (single antenna) and 2 (transmit diversity)
* Cell search and synchronization procedure for the UE
* All DL channels/signals are supported for UE and eNodeB side: PSS, SSS, PBCH, PCFICH, PHICH, PDCCH, PDSCH
* All UL channels/signals are supported for UE side: PRACH, PUSCH, PUCCH, SRS
* Frequency-based ZF and MMSE equalizer
* Highly optimized Turbo Decoder available in Intel SSE4.1/AVX (+100 Mbps) and standard C (+25 Mbps)
* UE receiver tested and verified with Amarisoft LTE 100 eNodeB and commercial LTE networks (Telefonica Spain, Three.ie and Eircom in Ireland)
* 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
srsUE Features
--------------
* Cell search and synchronization procedure for the UE
* Soft USIM supporting Milenage and XOR authentication
* Virtual network interface *tun_srsue* created upon network attach
* Above 60 Mbps DL in SISO configuration.
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
---------------
Missing Features:
* Closed-loop power control
* Semi-Persistent Scheduling
* Round Robin MAC scheduler with FAPI-like C++ API
* PUCCH Format1 and Format1A receiver
* Standard S1AP and GTP-U interfaces to the Core Network
* Tested up to 75 Mbps DL in SISO configuration with commercial UEs
srsENB has been tested and validated with the following handsets:
* LG Nexus 5
* Motorola Moto G4 plus
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.
@ -36,14 +63,26 @@ We have tested the following hardware:
* USRP X300
* bladeRF
Download & Install Instructions
=================================
Build Instructions
------------------
* Mandatory requirements:
* Common:
* 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/
* Mandatory dependencies:
* libfftw
* Optional requirements:
* srsgui: for real-time plotting. Download it here: https://github.com/srslte/srsgui
* VOLK: if the VOLK library and headers are detected, they will be used for accelerating some signal processing functions.
* srsgui: https://github.com/srslte/srsgui - for real-time plotting.
* VOLK: https://github.com/gnuradio/volk - if the VOLK library and headers are detected, they will be used to accelerate some signal processing functions.
* RF front-end driver:
* UHD: https://github.com/EttusResearch/uhd
* BladeRF: https://github.com/Nuand/bladeRF
Download and build srsLTE:
```
@ -55,64 +94,27 @@ cmake ../
make
```
The library can also be installed using the command ```sudo make install```.
Running srsLTE Examples
========================
* SIB1 reception and UE measurement from commercial LTE networks:
```
lte/examples/pdsch_ue -f [frequency_in_Hz]
```
Where -f is the LTE channel frequency.
* eNodeB to UE Downlink PHY test
You will need two computers, each equipped with a USRP. At the transmitter side, run:
```
lte/examples/pdsch_enodeb -f [frequency_in_Hz] [-h for more commands]
At the transmitter console, it is possible to change the Modulation and Coding Scheme (MCS) by typing a new number (between 0 and 28) and pressing Enter.
The output at the receiver should look something similar to the following video. In this example, we removed the transmitter and receiver antennas in the middle of the demonstration, showing how reception is still possible (despite with some erros).
The software suite can also be installed using the command ```sudo make install```.
The srsUE and srsENB applications include example configuration files. Execute the applications with root privileges to enable real-time thread priorities and to permit creation of virtual network interfaces.
* Video over Downlink PHY (eNodeB to UE)
The previous example sends random bits to the UE. It is possible to open a TCP socket and stream video over the LTE PHY DL wireless connection. At the transmitter side, run the following command:
### srsUE
Run the srsUE application as follows:
```
lte/examples/pdsch_enodeb -f [frequency_in_Hz] -u 2000 [-h for more commands]
sudo ./srsue ue.conf
```
The argument -u 2000 will open port 2000 for listening for TCP connections. Set a high-order MCS, like 16 by typing 16 in the eNodeB console and pressing Enter.
### srsENB
As the srsLTE software suite does not include EPC functionality, a separate EPC is required to run srsENB. Run the application as follows:
The arguments -u 2001 -U 127.0.0.1 will forward the data that was injected at the eNodeB to address:port indicated by the argument. Once you have the system running, you can transmit some useful data, like a video stream. At the transmitter side, run:
Ismael Gomez
8 years ago