[srslte-users] Tx/Rx common Port in TDD-LTE setup

[Kai Ling]

Hi all!

I am new here and I am very glad to join this community. I am setting up my testbed with USRP B210 and I try to monitor the signals from NB IoT in North America. I met two problems now.

1) Do we have any manual for the APIs in NB IoT? I cannot find it on the Internet and I can only find this one http://www.sharetechnote.com/html/SDR_srsLTE_Api.html <http://www.sharetechnote.com/html/SDR_srsLTE_Api.html> and it is an unofficial manual for LTE not NB IoT.
2) I try to find some cells in the NB IoT but I failed, I can find the cell(id:181,earfcn:2296) which is in band 4 with my IoT device(P-L496G-CELL02) but I cannot find it using USRP B210. I can only get the record with ./cell_search_nbiot -b 4

[346/449]: EARFCN 2296, 2144.59 MHz looking for NPSS.
NSSS with peak = 0.237753, cell-id:1000, partial SFN: 0
Cell found but couldn’t detect ID.

Is this related to the signal strength? Will more antennas help?

Thanks in advance for your help!

Best, Kai

> On Sep 27, 2021, at 10:34 AM, Mehdi <studentatsharif at gmail.com> wrote:
> 
> Hi all!
> 
> I am working on TDD LTE using  SRS open source at UE side and OAI at eNB,  with two USRP b2x0’s.
> 
> As far as I am concerned, the open sources are configured for using separate Tx and Rx ports of the USRPs. I was wondering whether there is any special software/hardware-based configuration to be able to run the TDD-LTE setup using the ``common’’ Tx/Rx port of my USRPs at both UE and eNB?
> 
> Thanks in advance for your help!
> Best,
> 
> Mehdi
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