Hello David,

On Thu, 3 Dec 2009 01:07:56 -0800, "David A. Burgess" dburgess@jcis.net wrote:

I don't know if that's valid by the spec or not, but it's part of a pretty standard configuration in IMSI-catchers: CCCH+SDCCH4 + 6*SDCCH8 + TCH/F. That maximizes location updating capacity and leaves one TCH/F for other ... mischief. Most of those IMSI-catchers are based on commercial mini/nano-BTS equipment.

Thanks for this input. I think this a limitation of the BS11 only, I have read that there are some limitations related to the SDCCH/8 of the BS11:

- only one SDCCH/8 per TRX - not allowed together with SDCCH/4 on BCCH-TRX

Maybe the BS11 does not have enough processing power to handle it ? Of course it could be that the documentation is wrong and it would work, I have not yet tried it.

Best regards, Dieter