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srsran / srsRAN_4G

Open source SDR 4G software suite from Software Radio Systems (SRS) https://docs.srsran.com/projects/4g
https://www.srsran.com
GNU Affero General Public License v3.0
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SCS & TDD feature #971

Closed liyuecheng closed 2 years ago

liyuecheng commented 2 years ago

Issue Description

Hello,I want to use srsRAN as a baseline to build a 5G nr system at mm-wave band (FR2).
I have read the documents ( Application notes: 5G SA End-to-End , 5G SA COTS UE, 5G SA srsUE), and noticed that "Limited to 15 kHz Sub-Carrier Spacing (SCS), which means only FDD bands can be used." mentioned in "5G SA COTS UE" and" 5G SA srsUE", but not "5G SA End-to-End". And band 78 is used in "5G SA End-to-End" which supports TDD.
so I'm confused that is srsRAN supports TDD or not? Is SCS other than 15khz supported? If not, Any plans for those currently limited features?

andrepuschmann commented 2 years ago

Thanks for the question. I confirm that we do support TDD. That is what's being used in a few NSA configs for example. However, we do not support 30kHz SCS (it's more a limitation of the srsRAN radio layer rather than the signal processing). The reason why SA is only FDD is because practically no commercial phone supports 15kHz on an TDD band.

We are currently working on a new gNB stack that we are planning to release towards the end of the year - it will support all those configs out-of-the-box.

hahat1999 commented 8 months ago

Hello is there any update to fix this issue?