How to modify the configurations of SRS (sounding reference signal)

[RFF-SEUphc]

Now, we have constructed a 5G communication system based on srsRAN Project with COTS UEs. We find that the newest version of srsRAN Project has a new feature, i.e., the inclusion of SRS (sounding reference signal), but we don't know how to enable this function and modify its detailed configurations (those parameters have been fixed in this system? If yes, how to find and modify them?). In fact, we only see that there are some ".h" files related to the implements of physical layer, and no detailed time-frequency resource configurations can be easily accessed for a specific COTS UE. Our research aims to capture this type of reference signal for further study, and we hope that someone can provide some suggestions for us to promote our research. Also, we do hope that more configuration items are sorted by a config. file in the future version.

[MariusTillner]

I'm not a developer, but I suggest go to Configuration Reference, do ctrl+f and search for srs, you should find the following section then

srs: srs_period_ms: # Optional FLOAT. Sets the periodic SRS period in ms. The SRS period needs to be compatible with the subcarrier spacing. Supported: {1,2,2.5,4,5,8,10,16,20,32,40,64,80,160,320,640,1280,2560}. srs_max_nof_sym_per_slot: 2 # Optional UINT (2). Sets the number of symbols for UL slot that are reserved for the SRS cell resources. Supprted: [1 - 6]. srs_nof_sym_per_resource: 1 # Optional UINT (2). Sets the number of symbols per SRS resource. Supported: {1,2,4}. srs_tx_comb: 4 # Optional UINT (4). Sets the SRS TX comb size. Supported: {2, 4}. srs_cyclic_shift_reuse: 1 # Optional UINT (1). Sets the SRS cyclic shift reuse factor. It needs to be compatible with the TX comb and number of UL antenna ports. Supported: {1,2,3,4,6}. srs_sequence_id_reuse: 1 # Optional UINT (1). Sets the reuse factor for the SRS sequence ID. Supported: {1,2,3,5,6,10,15,30}.

[RFF-SEUphc]

Thank you very much.

[brendan-mcauliffe]

Hi @RFF-SEUphc,

As @MariusTillner has pointed out, the information you require is in the documentation. I suggest you read this to help you understand how to use srsRAN Project efficiently.

[RFF-SEUphc]

Thanks!