[srslte-users] BladeRF - Moto G5 not attaching

[Andre Puschmann]

Hi,

in the UE log with 10dB Tx gain, you get a SNR of ~22dB which is good.
Problem is that the pdsch_ue uses AGC and srsUE does not. So just pass a
gain value to pdsch_ue as well to fix the receiver gain to a value x.

And then play with x and the transmitter gain y such that you get a good
SNR (let's say > 20dB) and make sure the constellation looks good. And
then use those values x and y for srsUE and srsENB.

Cheers
Andre

On 15/03/18 05:27, Ghannam, Rami wrote:
> Hi,
> 
> I started using pdsch_ue and pdsch_enb. I opened pdsch_enb on one machine with a frequency of 2685MHz and I tried with two gain values of 80dB and 10dB.
> I attached the output from those two commands.
> 
> I opened pdsche_ue on the other machine and captured the results (see attached).
> 
> Please let me know what you think so far. 
> 
> Thank you,
> 
> Rami
> 
> ________________________________________
> From: Andre Puschmann [andre.puschmann at softwareradiosystems.com]
> Sent: Wednesday, March 14, 2018 3:36 AM
> To: Ghannam, Rami; Ismael Gomez
> Cc: Sharevski, Filipo; srslte-users at lists.softwareradiosystems.com
> Subject: Re: [srslte-users] BladeRF - Moto G5 not attaching
> 
> Hey,
> 
> DL signal seems to be ok with an SNR of ~10dB, even though there is
> still room for improvement. The UE transmits PRACH but eNB never
> receives it. I see you use the same rx/tx gains for both UE and eNB
> which is fine in principle. But to double check let's run the pdsch_enb
> and pdsch_ue on both machines (and vice versa) with those exact gain
> settings and check that both can receive a perfect signal, and if not
> adjust the gain settings accordingly.
> 
> The bladeRF calibration is not srsLTE specific and the nuand blog and
> wiki is full with helpful material on this topic.
> 
> Thanks
> Andre
> 
> 
> On 14/03/18 06:37, Ghannam, Rami wrote:
>> Hello again,
>>
>> I now have the following setup:
>>
>>   * an Ubuntu machine with a BladeRF x115 running srsepc+srsenb
>>   * another Ubuntu machine with another BladeRF x115 running srsue
>>
>> srsUE is able to receive SIB information but never attaches. Any advice
>> on how to proceed? Also how can I do the calibration with srsLTE?
>>
>>
>>
>> I attached the config files, log files and pcap capture.
>>
>> Thank you,
>>
>> Rami
>> ------------------------------------------------------------------------
>> *From:* Ismael Gomez [ismael.gomez at softwareradiosystems.com]
>> *Sent:* Tuesday, March 06, 2018 2:52 AM
>> *To:* Ghannam, Rami
>> *Cc:* srslte-users at lists.softwareradiosystems.com; Sharevski, Filipo
>> *Subject:* Re: [srslte-users] BladeRF - Moto G5 not attaching
>>
>> Can you attach with srsUE? You need to check that the RF signal looks
>> good and PUSCH power settings in sib2 configuration make sense. We have
>> not tested the BladeRF with srsENB. I think you may need to do some
>> calibration.
>>
>> On Tue, 6 Mar 2018 at 03:50 Ghannam, Rami <RGHANNAM at cdm.depaul.edu
>> <mailto:RGHANNAM at cdm.depaul.edu>> wrote:
>>
>>     Hello,
>>
>>     I am trying to deploy a srsLTE network. I have a BladeRF x115 and a
>>     Moto G5 phone. I can successfully start srsEPC and srsENB.
>>
>>     However, Moto G5 is not able to attach to the network.
>>
>>     Are there any recommendations about this issue?
>>
>>     Thank you.
>>
>>     Rami____
>>
>>     __ __
>>
>>     __ __
>>
>>     *Rami Ghannam*
>>     PhD Candidate____
>>
>>     College of Computing and Digital Media
>>     <https://www.cdm.depaul.edu/Pages/default.aspx>
>>     DePaul University, Chicago, IL 60604____
>>
>>     __ __
>>
>>     _______________________________________________
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>>
>>
>>
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> 


-- 
Andre Puschmann

Software Radio Systems (SRS)
http://www.softwareradiosystems.com

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