Re: [Openbts-discuss] Issues with phones connecting to the base station

[Scott V. <sva...@co...>]

Sorry, I should have provided more details. I have read the background
info on clocking and camping. The setup is using a USRP N200 with the
RFX-900 front end, and I have tried multiple ARFCNs in the primary (0-124)
900 MHz band. The MCC/MNC is set to use China Unicom and the IMSIs on the
SIM cards are burned accordingly.

I've thought about the clock issue, as I have seen time and again that the
first thing to do is get a discplined clock. Well, that and the way an
hand set synchronizes its clock apparently can lead to all kinds of
wierdness.

Only problem is, I have no issue seeing the base station if the phone does
a scan, I just can't connect to it, and the phone gives me a useless error
message. Rescanning, or turning the radio off and back on does not seem to
help. Pretty much once the phone loses the network the only solution is a
reboot (of the phone).

Anyhow, the long term plan is to get a clocktamer or GPSDO kit from Ettus,
but I'm worried about the fact that the phone sees the base station but
refuses to connect with a SIM card error - which is why I wonder if anyone
else has experienced such an issue.

> Scott,
>
> The first thing to check is whether you have good enough clock and
> whether you use an ARFCN without interference from incumbent operator.
>
> On Wed, Mar 7, 2012 at 03:28, Scott Valentine
> <sva...@co...> wrote:
>> I am experimenting with version 2.8 and I have everything working great
>> with one exception.
>>
>> Two phones are provisioned in the system, and if the base station is up
>> and running when I boot the phones, they jump on the network
>> automatically. However, if they lose the network, or boot without the
>> base
>> station up and running, I cannot get them to reassociate (without
>> rebooting), even though the base station clearly shows up in the list of
>> available providers. If I try and configure the phone to connect to that
>> provider, it gives me a "SIM card does not allow you to register to this
>> network" or some such error, so I am inclined to think I need to adjust
>> the SIM, or the phone software is just flakely.
>>
>> Has anyone else experienced this? What can I do to begin diagnosing any
>> problems on the base station?
>>
>> Thanks
>>
>> - Scott V.
>>
>>
>>
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>
>
>
> --
> Regards,
> Alexander Chemeris.
>


Scott Valentine

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