[srslte-users] SrsLTE using USRP N321

[Andre Puschmann]

Hi,

On 10/12/20 15:45, Charbel Lahoud wrote:
> I have configured and compiled with "cmake -DUSE_LTE_RATES=True ..", still getting same result:
> 	- 6 RBs: srsue connected but not stable

6 PRBs are a bit iffy at times bc the block size isn't small and
sometime the transport/UHD doesn't like that. UHD tuning might help here
but I don't have any "good" config here. Maybe someone else on the list has.

> 	- 15 and 75 RBs: srsue connected and stable

Good. So you know your setup works in general.

> 	- 25 and 100 RBs: srsue not connected

Send screenlog and real logs please.

Cheers
Andre

> 
> Appreciate you help!
> 
> Also I am not able to connect srsue to the internet, but pinging it is working. The steps I have done: 
> 	- running "sudo srsepc_if_masq <out_interface>" (I replaced out_interface by the net interface connected to internet)
> 	- I filled gtpu_bind_addr in EPC with the ip of the net interface connected to internet.
> 
> Cheers
> Charbel
> 
> -----Original Message-----
> From: Andre Puschmann <andre.puschmann at softwareradiosystems.com> 
> Sent: Thursday, December 10, 2020 2:58 PM
> To: Charbel Lahoud <charbel.lahoud at etit.tu-chemnitz.de>
> Subject: Re: [srslte-users] SrsLTE using USRP N321
> 
> Hi,
> 
> the N3xx requires to use standard LTE sample rates. For this purpose, you have to configure and compile with "cmake -DUSE_LTE_RATES=True .."
> 
> The next release will include a run-time option to switch between both modes.
> 
> Cheers
> Andre
> 
> 
> On 10/12/20 14:10, Charbel Lahoud wrote:
>> Hello,
>>
>>  
>>
>> I have successfully build srsLTE software with radio heads USRP N321.
>> But it is only working with 75 resource blocks, when I change to other 
>> options such as 100, 50 and 25 the srsue isn't connecting and I have 
>> additional warnings.
>>
>>  
>>
>> [WARNING] [RFNOC] The requested decimation is odd; the user should 
>> expect passband CIC rolloff.
>>
>> Select an even decimation to ensure that a halfband filter is enabled.
>>
>> Decimations factorable by 4 will enable 2 halfbands, those factorable 
>> by
>> 8 will enable 3 halfbands.
>>
>> decimation = dsp_rate/samp_rate -> 11 = (245.760000 MHz)/(23.040000 
>> MHz)
>>
>>  
>>
>> [WARNING] [MULTI_USRP] The hardware does not support the requested RX 
>> sample rate:
>>
>> Target sample rate: 23.040000 MSps
>>
>> Actual sample rate: 22.341818 MSps
>>
>>  
>>
>> [WARNING] [MULTI_USRP] The hardware does not support the requested RX 
>> sample rate:
>>
>> Target sample rate: 23.040000 MSps
>>
>> Actual sample rate: 22.341818 MSps
>>
>>  
>>
>> [WARNING] [RFNOC] The requested interpolation is odd; the user should 
>> expect passband CIC rolloff.
>>
>> Select an even interpolation to ensure that a halfband filter is enabled.
>>
>> interpolation = dsp_rate/samp_rate -> 11 = (245.760000 MHz)/(23.040000 
>> MHz)
>>
>>  
>>
>> [WARNING] [RFNOC] The requested interpolation is odd; the user should 
>> expect passband CIC rolloff.
>>
>> Select an even interpolation to ensure that a halfband filter is enabled.
>>
>> interpolation = dsp_rate/samp_rate -> 11 = (245.760000 MHz)/(23.040000 
>> MHz)
>>
>>  
>>
>> [WARNING] [MULTI_USRP] The hardware does not support the requested TX 
>> sample rate:
>>
>> Target sample rate: 23.040000 MSps
>>
>> Actual sample rate: 22.341818 MSps
>>
>>  
>>
>> [WARNING] [MULTI_USRP] The hardware does not support the requested TX 
>> sample rate:
>>
>> Target sample rate: 23.040000 MSps
>>
>> Actual sample rate: 22.341818 MSps
>>
>>  
>>
>> Regards
>>
>> Charbel
>>
>>
>> _______________________________________________
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>> srslte-users at lists.softwareradiosystems.com
>> http://www.softwareradiosystems.com/mailman/listinfo/srslte-users
>>
> 


-- 
Andre Puschmann

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

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