[srslte-users] SrsLTE using USRP N321

[Charbel Lahoud]

Hi,

I have configured and compiled with "cmake -DUSE_LTE_RATES=True ..", still getting same result:
	- 6 RBs: srsue connected but not stable
	- 15 and 75 RBs: srsue connected and stable
	- 25 and 100 RBs: srsue not connected

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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