Trouble with 5G config settings on Colosseum

[Jaehong Kim]

Dear developers and users,

I have some trouble making my own configuration on Colosseum,
and I have the following questions:

- I want to run srsRAN(srsLTE) 21.10 release which supports 5G NSA gNodeB.
Have anyone tried this and if you did, could you provide me some configurations for this setting?

- I used the configuration provided in the Colosseum github repo and was able to successfully run the full UE-ENB testbed with RF SCOPE scenarios.
I want to increase the number of RBs from 15 (default in this config) to at least 50 or more (just like in SCOPE).
If I just change the numbers on enb.conf it's not working. Do you have any suggestions?

- Seems that srsRAN supports up to 4 UEs per eNB. If I try to attach more UEs, it fails.
This holds true for COTS phones in my local testbed. Is the max limit of the number of UEs for srsLTE is 4 ?

[Leonardo Bonati]

Hi,

The following modifications (taken from SCOPE) should be sufficient to make srsLTE work on Colosseum:

- https://github.com/wineslab/colosseum-scope/search?q=colosseum_testbed

- https://github.com/wineslab/colosseum-scope/search?q=tx_adv_colosseum

Be also sure to set the time advance to "colosseum" in the eNB and UE configuration files:

- https://github.com/wineslab/colosseum-scope/blob/a81bcc2ae61bfcc05ce54dcd5c6b9f6f5dedc980/radio_code/srsLTE/config_files/colosseum_config/enb.conf#L69

- https://github.com/wineslab/colosseum-scope/blob/a81bcc2ae61bfcc05ce54dcd5c6b9f6f5dedc980/radio_code/srsLTE/config_files/colosseum_config/ue.conf#L40

This has been tested with up to 10 UEs per eNB with SCOPE.

Regards,

Leonardo