[srslte-users] enb falling apart for n_prb>50

[J Giovatto]

First off I'd check the cpu utilization at the different rates, the
higher rates can be very demanding.

Joe


On 3/25/21 10:36 AM, Andrea Valori wrote:
> Dear All,
>
> I was trying to monitor the performances of the enb varying the n_prb
> parameter.
> In theory, for my understanding, the bandwidth and transfer should go
> UP increasing n_prb. This is what I see up to n_prb=50, but with 75 or
> 100 I am struggling to attach the UEs and they drop the connection
> very quickly making it impossible to conclude an iperf test...
>
> What can it be in your opinion? Tx/Rx interference? PC and/or SDR
> board performance?
>
> Something that I noticed is a weird sequence in the stout (see below):
> For n_prb<=50 the " ==== eNodeB started === " message is at the end of
> all the messages (after actual clock rate and setting frequency).
> For the n_prb=75 (and same for 100) these messages are inverted and
> seem that the eNodeB is started before setting the frequency?
> Could this be a hint of wrong timings somewhere? 
>
> Cheers
> ---------------------------------------------------------------------------------------------------------
>
> bts at bts-ThinkPad-L460:~$ sudo srsenb --enb.n_prb 50
>
> [sudo] password for bts:
>
> ---  Software Radio Systems LTE eNodeB  ---
>
>  
>
> Reading configuration file /home/bts/.config/srslte/enb.conf...
>
>  
>
> Built in Release mode using commit ff84d7779 on branch fixing_enb_20_10.
>
>  
>
> /home/bts/srsLTE/srsenb/src/enb_cfg_parser.cc.890: Force DL EARFCN for
> cell PCI=1 to 2525
>
>  
>
> Opening 1 channels in RF device=default with args=default
>
> [INFO] [UHD] linux; GNU C++ version 7.5.0; Boost_106501;
> UHD_3.15.0.0-62-g7a3f1516
>
> [INFO] [LOGGING] Fastpath logging disabled at runtime.
>
> Opening USRP channels=1, args: type=b200,master_clock_rate=23.04e6
>
> [INFO] [B200] Detected Device: B200
>
> [INFO] [B200] Operating over USB 3.
>
> [INFO] [B200] Initialize CODEC control...
>
> [INFO] [B200] Initialize Radio control...
>
> [INFO] [B200] Performing register loopback test...
>
> [INFO] [B200] Register loopback test passed
>
> [INFO] [B200] Asking for clock rate 23.040000 MHz...
>
> [INFO] [B200] Actually got clock rate 23.040000 MHz.
>
> Setting frequency: DL=881.5 Mhz, UL=836.5 MHz for cc_idx=0
>
>  
>
> ==== eNodeB started ===
>
> Type <t> to view trace
>
> q
>
> Stopping ..
>
> ---  exiting  ---
>
> bts at bts-ThinkPad-L460:~$ sudo srsenb --enb.n_prb 75
>
> ---  Software Radio Systems LTE eNodeB  ---
>
>  
>
> Reading configuration file /home/bts/.config/srslte/enb.conf...
>
>  
>
> Built in Release mode using commit ff84d7779 on branch fixing_enb_20_10.
>
>  
>
> /home/bts/srsLTE/srsenb/src/enb_cfg_parser.cc.890: Force DL EARFCN for
> cell PCI=1 to 2525
>
>  
>
> Opening 1 channels in RF device=default with args=default
>
> [INFO] [UHD] linux; GNU C++ version 7.5.0; Boost_106501;
> UHD_3.15.0.0-62-g7a3f1516
>
> [INFO] [LOGGING] Fastpath logging disabled at runtime.
>
> Opening USRP channels=1, args: type=b200,master_clock_rate=23.04e6
>
> [INFO] [B200] Detected Device: B200
>
> [INFO] [B200] Operating over USB 3.
>
> [INFO] [B200] Initialize CODEC control...
>
> [INFO] [B200] Initialize Radio control...
>
> [INFO] [B200] Performing register loopback test...
>
> [INFO] [B200] Register loopback test passed
>
> [INFO] [B200] Asking for clock rate 23.040000 MHz...
>
> [INFO] [B200] Actually got clock rate 23.040000 MHz.
>
> [INFO] [B200] Asking for clock rate 61.440000 MHz...
>
>  
>
> ==== eNodeB started ===
>
> Type <t> to view trace
>
> [INFO] [B200] Actually got clock rate 61.440000 MHz.
>
> Setting frequency: DL=881.5 Mhz, UL=836.5 MHz for cc_idx=0
>
> q
>
> Stopping ..
>
> ---  exiting  ---
>
>
>
>
>
>
>
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> srslte-users at lists.softwareradiosystems.com
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