TTUXL.github.io
LTE Implementation Issue on USRP Testbed
Most Famous LTE Open Source Platforms don’t Support Ettus N210.
1. OpenAirInterface
https://gitlab.eurecom.fr/oai/openairinterface5g/wikis/OpenAirSystemRequirements#supported-rf
Supported RF:
USRP B210 http://www.ettus.com/product/details/UB210-KIT
USRP X310 http://www.ettus.com/product/details/X310-KIT
BladeRF http://nuand.com/
LimeSDR http://limesdr.org/
EURECOM EXPRESSMIMO2 RF, http://openairinterface.eurecom.fr
2. srsLTE
https://github.com/srsLTE/srsLTE#hardware
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
Why don’t Support N210
The hardware limitation is that master clock of the N210 is fixed at 100 MHz, which is not a multiple of common LTE sample rates.
Physical Layer Parameter
USRP Parameter
Solution
Q6: Does OpenAirInterface work with the Ettus N210?[1]
A6. The software should run, but the reference on the N210 is not at a frequency that can generate the required 7.68/15.36 MHz sampling. You should be able to get the OAI eNB to work with the OAI UE running at the wrong sampling rate though.
Reference
[1] https://gitlab.eurecom.fr/oai/openairinterface5g/wikis/FAQ
[2] https://docs.srslte.com/en/latest/srsue/source/1_ue_intro.html
[3] http://www.sharetechnote.com/html/SDR_srsLTE_Api.html