[srsran-users] Send Sounding Reference Signal with srsLTE

[Alessio Scalingi]

Hi all,

Repost this from an open issue. I am trying to enable the UE to send the SRS. But I can't find any guide or information about how to do that.

I have seen into the lib/src/phy/ch_estimate.cc module that there is a function to estimate the srs signal (when it is received), but I don't know how to enable it from the eNB.
Looking at the configuration files, enb.conf, ue.conf, rr.conf I can't find any reference, so I don't know how to proceed.

Does anyone has already worked with it? I appreciate if someone can help me to deal with that. We can update the issue on git such that other people can face the same issue.(https://github.com/srsran/srsRAN_4G/issues/1126 <https://github.com/srsran/srsRAN_4G/issues/1126>)

Best,

Alessio Scalingi                                                               
PhD Student
IMDEA Networks Institute

E-mail: alessio.scalingi at imdea.org
Phone: +34  623 067 475‬
Address: Av. Del Mar Mediterraneo, 22, 28918, Leganés, Madrid, Spain

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> Il giorno 24 mar 2023, alle ore 4:23 PM, Antonio Albanese <antonioalbanese15 at gmail.com> ha scritto:
> 
> Hey guys, 
> 
> a bit of a particular question for those of you who have experimented with srsRAN and docker. 
> 
> I built a docker image for srsRAN 21.10 based on Ubuntu 20.04. I am aware that this is not the latest srsRAN release but it should be unrelated to my issue, I hope! 
> 
> I am experiencing a weird behavior, particularly with srsue. I am using a bladerf 2.0 xA4, which comes with its own problems with srsue (see the open issue on the Nuand github about the board easily getting stuck when changing sampling rate). Nonetheless, I managed to have a working srsRAN image for srsepc, srsenb and srsue. 
> 
> I can run it using docker-compose with docker-compose up srsue with no problem. However, whenever I call it from Python with 
> 
> import subprocess 
> cmd = "docker-compose up --detach srsue" 
> p = subprocess.Popen(cmd, cwd=paths["docker"], shell=True)
> 
> srsue never tries to attach. I had this in the past and it all boiled down to srsue failing to lock synchronization with PSS and SSS. I have not looked into the logs and the PCAPs yet, just because it is a little more cumbersome to extract them from a container but I will. Anyway, I would not know what to do if they confirmed my assumption.
> 
> To make matters worse, I can run the container in terminal with the CPU governor in power save mode while I cannot run it from Python even in performance mode.    
> 
> I wonder how Python is increasing the overhead on the container here or even if the problem is Python or something else altogether! 
> Please note that I also tried with  stdout=subprocess.PIPE, stderr=subprocess.PIPE reading the console output using  p.stdout.readline for that matter. 
> 
> Lastly, something else that I found quite interesting (I let you imagine how long it took to figure this out). The container would not work using Ubuntu 22.04 as base and I had to downgrade it to 20.04 to have it stable. This happens also at host level, meaning that I have a clean installation of Ubuntu 22.04 that would not run srsue on bare metal but it would in a container using Ubuntu 20.04 as base (in fact, Ubuntu 20.04 host would run srsue on bare metal too). The same Ubuntu 22.04 is the host I use when I call the container from Python, maybe this somehow affects things? 
> 
> I will keep troubleshooting the problem. Meanwhile, has anyone had any similar experience and would like to share any hints? 
> Thank you very much! 
> 
> Cheers, 
> Antonio
> 
> 
> 
> 
> 
> 
> 
> 
> ᐧ
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