On Tue, Jul 27, 2010 at 09:33:07PM +0200, Sylvain Munaut wrote: > > I don't really know if full spectrum monitoring it's required to do the > > cracking/interception job > > No, it's not, unless you want to listen to _all_ the communication taking > part simultaneously in the zone ... > > Most likely the local cell isn't gonna hop between all the ARFCN in the band > ... The two config I've seen here locally : > - A few ARFCN relatively close together ( < 60 MHz and even often < 25 MHz > )
Yes, (I know Sylvain, you know this, but maybe not all others in this thread) this by the way is the result of how the spectrum is allocated to a single operator by the regulatory authority in the respective country. > - The BCCH ARCFN + A large contiguous range of hopping ARFCN somewhere > else. This is the result of common network planning methods where you have one rarely reused allocation of ARFCN for BCCHs, and faster frequency reuse scheme for the hopping and power-controlled traffic chnannels. Also, you generally are interested in the traffic of one cell. And for that cell, you can obtain the Cell Channel Allocation list from its BCCH. After that you have a limited set of ARFCNs that you will have to monitor. The specification limits the number of ARFCN of one given cell to 64. -- - Harald Welte <[email protected]> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6) _______________________________________________ A51 mailing list [email protected] http://lists.lists.reflextor.com/cgi-bin/mailman/listinfo/a51
