Possible to control the radio strength of a nanoBTS?

[Harald Welte]

On Thu, Jun 04, 2009 at 02:49:21PM +0200, Nordin wrote:
> Harald Welte schreef:
>> On Thu, Jun 04, 2009 at 12:45:36PM +0200, Nordin wrote:
>>   
>>> Hi Roch,
>>>
>>>     
>>>> Another thing: if your mobile phone is set to auto it will always   
>>>> register on its home network (if available) even if the signal of 
>>>> your  basestation is far stronger.
>>>>
>>>>       
>>> Can you specify home network?
>>>     
>>
>> the network that has issued the sim card.  technically: the network with
>> the MCC and MNC of the IMSI of th SIM.
>>
>>   
> Yes, that's obvious.
> But if my BTS has the same ARFCN, besides the MCC and the MNC,  as the  
> mobile has tuned to, than it's possible that the mobile tries to  
> register to my BTS.

Also don't forget to make sure the BSIC and possibly even TSC is the same.

> That's why I think our gsm-module (gsm for our servers) automatically  
> tries to register to my BTS. A nice detail, after 4 times, the  
> gsm-module stops trying to register to our BTS. I guess, that's an  
> algorithm (maybe vendor-specific), to search for other available  
> channels (ARFCNs).

it's very clearly specified in the GSM specs into every possible detail.  I
don't remember which one, though.

-- 
- Harald Welte <laforge at gnumonks.org>           http://laforge.gnumonks.org/
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