Hi!
We've just finished most of the build-up of the GSM network at 26C3, and I've noticed that the ARFCN's that we've been allocated are further than 111 apart, i.e. we cannot use the 'variable bitmap' format that OpenBSC implements so far.
If anyone understands (and/or has time to implement) the specification in GSM TS 04.08 10.5.2.13.3 / 10.5.2.13.4 / 10.5.2.13.5, or even the full algorithm as specified in "Annex J: Algorithm to encode frequency list information elements", I would be extremely grateful.
Off to bed, will be yet another long day tomorrow.