OpenBSC Digest, Vol 64, Issue 2

historical

 The commercial MS see the network and i could send sms and call with it. 
the Limesdrmini doesn't support CBS?

    Le mercredi 12 février 2020 à 20:57:52 UTC, openbsc-request at lists.osmocom.org <openbsc-request at lists.osmocom.org> a écrit :  

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Today's Topics:

  1. CBS + Osmocom + LimeSDR-Mini (Radiarisainana Sitraka)
  2. CBS + ETWS + CMAS + Limesdrmini (Radiarisainana Sitraka)
  3. Re: Commercial MSs do not see the network (Tomcs?nyi)
  4. Re: Commercial MSs do not see the network (Joachim Steiger)

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Message: 1
Date: Wed, 12 Feb 2020 19:12:17 +0000 (UTC)
From: Radiarisainana Sitraka <radiarisainanasitraka at yahoo.fr>
To: "openbsc at lists.osmocom.org" <openbsc at lists.osmocom.org>
Subject: CBS + Osmocom + LimeSDR-Mini
Message-ID: <647375309.3679103.1581534737485 at mail.yahoo.com>
Content-Type: text/plain; charset="utf-8"

Hello,

I'm testing CBS LimeSDR-Mini with osmocom by following this 
Version 10 - History - Cell Broadcast - Cellular Network Infrastructure - Open Source Mobile Communications

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Version 10 - History - Cell Broadcast - Cellular Network Infrastructure ...

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h4. make sure your related BTS is configured to use a channel combination with CBCH For using a combined CCCH with SDCCH/4 and CBCH you can use the following example snippet as part of osmo-bsc.cfg:
    network  bts 0  trx 0    timeslot 0    phys_chan_config CCCH+SDCCH4+CBCH 

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Message: 2
Date: Wed, 12 Feb 2020 19:15:52 +0000 (UTC)
From: Radiarisainana Sitraka <radiarisainanasitraka at yahoo.fr>
To: "openbsc at lists.osmocom.org" <openbsc at lists.osmocom.org>
Subject: CBS + ETWS + CMAS + Limesdrmini
Message-ID: <1096509901.3658822.1581534952916 at mail.yahoo.com>
Content-Type: text/plain; charset="utf-8"

Hi,
I follow this tutorial : Version 10 - History - Cell Broadcast - Cellular Network Infrastructure - Open Source Mobile Communications for doing CBS with limesdrmini but it doesn't run , is it due to that limesdrmini doesn't support the command telnet to osmo-bsc at port 4242, and enter something likeor i do something wrong.

Chears,

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Version 10 - History - Cell Broadcast - Cellular Network Infrastructure ...

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Message: 3
Date: Wed, 12 Feb 2020 20:15:56 +0100 (CET)
From: Tomcs?nyi, Domonkos <domi at tomcsanyi.net>
To: Sandi Suhendro <djks74 at gmail.com>
Cc: Neels Hofmeyr <nhofmeyr at sysmocom.de>, openbsc
    <openbsc at lists.osmocom.org>
Subject: Re: Commercial MSs do not see the network
Message-ID: <4C8690C1-F026-4011-93FA-E7D8851A4B8C at tomcsanyi.net>
Content-Type: text/plain; charset="utf-8"

Hello Sandi and Neels,

@Neels: :-) \o thanks.

@Sandi:
Thank you for the idea. I have changed the attenuation to oml, and I could observe the following:
All Qcomm based devices now see the network and with a bit of luck they could register: Xiaomi Mi5, Samsung A90 5G, iPhone X.
However any Exynos based device (S6, S7, S8) simply refuses to even detect the network. Any time I put in a sysmocom SIM in a Qcomm based device it happily goes on the new network. On the other hand if the same SIM card is plugged into an Exynos device it shows No service and even with manual search it cannot detect the network.

I assume with other radio hardware (e.g. umTRX) there are no issues with Exynos devices, so it is most probably the USRP not being good enough I think.

However if anybody has any other ideas I?d still be happy to get any feedback and try things out :).

Cheers,

Domi

> 2020. febr. 12. d?tummal, 14:20 id?pontban Sandi Suhendro <djks74 at gmail.com> ?rta:
> 
> ?
> Dear Tomi,
> have you try to set attenuation set to OML and osmo-trx?
> 
>  osmotrx rx-gain 30
>  osmotrx tx-attenuation oml
> 
> Im not sure but I saw your attenuation is set. :-)
> 
> I think I face the problem before but using Motorola C115/117 cannot connect, but it was resolved now long time ago with newer osmo-bts.
> 
> regards,
> Sandi
> 
>> On Wed, Feb 12, 2020 at 7:10 PM Neels Hofmeyr <nhofmeyr at sysmocom.de> wrote:
>> On Wed, Feb 12, 2020 at 09:42:42AM +0100, Tomcs?nyi, Domonkos wrote:
>> > p.s. It is simply awesome to experience the power of opensource when dealing with 2G. Every step of the way above I was using software created and shared by you guys. It is a great feeling, had to share it :-).
>> 
>> Thanks Domi!!
>> I hope someone has answers your questions, I don't but wanted to wave back
>> anyway \o_
>> 
>> ~N
> 
> 
> -- 
> Best Regards, 
> Sandi
> 
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Message: 4
Date: Wed, 12 Feb 2020 21:36:48 +0100
From: Joachim Steiger <jsteiger at sysmocom.de>
To: Tomcs?nyi, Domonkos <domi at tomcsanyi.net>, Sandi Suhendro
    <djks74 at gmail.com>
Cc: openbsc <openbsc at lists.osmocom.org>
Subject: Re: Commercial MSs do not see the network
Message-ID: <04ed67fd-f62a-a849-9ec4-abdd64c3dc57 at sysmocom.de>
Content-Type: text/plain; charset=utf-8

hi,

On 2/12/20 8:15 PM, Tomcs?nyi, Domonkos wrote:
[...]
> I assume with other radio hardware (e.g. umTRX) there are no issues with Exynos devices, so it is most probably the USRP not being good enough I think.

i regulary use a b200/b210 series for tests, so i am quite sure it works
when using a known good clock.

try sending a external clock to the device, for example a 10MHz gpsdo or
another source which you can trust.
sometimes even old lab equipment can be used as a source when it has a
reference clock output (typically bnc).

enable using it by adding to your osmo-trx.cfg:

trx
 clock-ref external

the internal clock generation on generic sdr boards (which are not
targeted at gsm/tdma systems) are often not precise enough.
this is true for the basic usrp series as well as simple boards like the
limesdr mini or usb(which you also can feed a clock).

in contrast: the limenet micro has a gpsdo on board for exactly this reason.
the same is true for boards like the UmTRX, or when you add an precision
source to a usrp. i think there is a  module to add gps for the usrp.

> However if anybody has any other ideas I?d still be happy to get any feedback and try things out :).
> 
> Cheers,
> 
> Domi

i hope this gets it working for you.

kind regards.
-- 
- Joachim Steiger <jsteiger at sysmocom.de>      http://www.sysmocom.de/
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