srsgNB GPIO Support

[jboateng1]

Hello folks,

I am trying to run srsRAN with TDD Rf frontEnds (PA and LNA). I wonder if there is a portion of the code that can be changed to support these frontEnds? In OAI, this functionality is in the path "/openairinterface5g/targets/ARCH/USRP/USERSPACE/LIB/usrp_lib.cpp". Thanks for your help.

[rainey19]

I'm assuming you're using a USRP. You can look in the file lib/radio/uhd)/radio_uhd_tx_stream.cpp in the function radio_uhd_tx_stream::transmit_block, and in the if block if (metadata.start_of_burst) add you're code, then for switching back do something similar in radio_uhd_rx_stream.cpp.

Let me know if it works!

[jboateng1]

Thank you rainey19 for your response. I have made the changes and compiled successfully. However, I need to test this with our amplifier. I will do so and give you update accordingly.
In the meantime, I am checking if it's possible to get the srsRAN gNB to connect with a USRP based srsUE.

[pgawlowicz]

Please check our tutorial on connecting srsUE to gNB: https://docs.srsran.com/projects/project/en/latest/tutorials/source/srsUE/source/index.html

[joaquim-srs]

Hi there,

As of last week's release, srsRAN includes a discontinuous transmission mode which may be helpful for using TDD front-ends. At this moment, the feature is experimental, we are still testing it and open to feedback. You can take a look at the feature announcement discussion for more details.