[srslte-users] COTS UE fails to connect to SRSLTE eNB with 6 PRBs ( 1.4MHz BW)

[Venu Vennapusa]

Thanks Andre, 

May I know the band and phones were used for the tests. I see if I can try just in case.

Thanks and Regards,
Venu

-----Original Message-----
From: Andre Puschmann <andre.puschmann at softwareradiosystems.com> 
Sent: Wednesday, July 3, 2019 1:00 AM
To: Venu Vennapusa <venu.vennapusa at cohere-technologies.com>; srslte-users at lists.softwareradiosystems.com
Subject: Re: [srslte-users] COTS UE fails to connect to SRSLTE eNB with 6 PRBs ( 1.4MHz BW)

Venu,

On 2/7/19 0:20, Venu Vennapusa wrote:
> I came across
> this 
> http://www.softwareradiosystems.com/pipermail/srslte-users/2018-Septem
> ber/001901.html and tried different PDSCH MCSs manually along with 
> below changes, but no luck.
> 
> 
> rr.conf: nof_prb set to 0 for CQI and SR
> 
> sib.conf:prach_freq_offset set to 0

Yes, this is the most important change you need to make.

But please note, in general, 6 PRBs are not supported in many bands and so some phones are really picky and wont even attempt to PRACH on such "forbidden" configs. Some only attach if they see the test PLMN, so this really depends on your particular phone.

Cheers
Andre

> 
> enb.conf: pdsch_mcs set to 10, 20, 24, 28
> 
> 
> Can some one please forward me with the working configuration.
> 
>  
> 
> 
> 
> ----------------------------------------------------------------------
> --
> *From:* srslte-users
> <srslte-users-bounces at lists.softwareradiosystems.com> on behalf of 
> Venu Vennapusa <venu.vennapusa at cohere-technologies.com>
> *Sent:* Monday, July 1, 2019 12:46 PM
> *To:* srslte-users at lists.softwareradiosystems.com
> *Subject:* [srslte-users] COTS UE fails to connect to SRSLTE eNB with 
> 6 PRBs ( 1.4MHz BW)
>  
> 
> Hi Team,
> 
> 
>   I am trying to get a connection with COTS UE on srslte eNB with 6 
> PRBs. But UE never gets connection.
> 
> 
> Did anybody have success with 6 PRBs on srs eNB with COTS UE ? If yes, 
> am I missing anything here ?
> 
> 
> Note that the prach_freq_offset  parameter has been set to 0. Please 
> take a look and let me know if you need any other information.Any help 
> here is much appreciated. Thanks in advance.
> 
> 
> 
> 
> eNB console logs:
> 
> @@@@@@@@@@@@@
> 
> vennave at gpu6:~/srsLTE$ sudo srsenb
> linux; GNU C++ version 7.4.0; Boost_106501; 
> UHD_003.009.007-0-g50839059
> 
> 
> Built in Release mode using commit 5343b33f on branch master.
> 
> ---  Software Radio Systems LTE eNodeB  ---
> 
> Reading configuration file /home/vennave/.config/srslte/enb.conf...
> Opening USRP with args:
> type=x300,addr0=192.168.40.2,send_frame_size=8000,master_clock_rate=18
> 4.32e6
> -- X300 initialization sequence...
> -- Determining maximum frame size... 8000 bytes.
> -- Setup basic communication...
> -- Loading values from EEPROM...
> -- Setup RF frontend clocking...
> -- Radio 1x clock:184.32
> -- Initialize Radio0 control...
> -- Performing register loopback test... pass
> -- Initialize Radio1 control...
> -- Performing register loopback test... pass Setting frequency: 
> DL=2680.0 Mhz, UL=2560.0 MHz Setting Sampling frequency 1.92 MHz
> 
> ==== eNodeB started ===
> Type <t> to view trace
> 
> 
> Regards,
> 
> Venu
> 
> 
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