Dieter -
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.
-- David
On Dec 3, 2009, at 8:26 AM, Dieter Spaar wrote:
Hello Paul,
On Wed, 02 Dec 2009 22:36:53 +0000, s4dd@losers.yore.ma wrote:
Any help you guys could give is much appreciated!
I think the problem is the "Invalid Channel Combination!!!" error message. Try to change "phys_chan_config" of timeslot 1 from "SDCCH8" to "TCH/F". From my understanding of verify_chan_comb() "SDCCH8" is not allowed on the same TRX that already has "CCCH+SDCCH4" so I wonder why it is set in the config file (this only applies to the BS11). Sorry, I don't have a ready BS11 configuration at hand right now, so I can't test it.
Best regards, Dieter -- Dieter Spaar, Germany spaar@mirider.augusta.de
David A. Burgess Kestrel Signal Processing, Inc.