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Dieter Spaar spaar at mirider.augusta.deHello Holger, On Mon, 19 Apr 2010 12:37:12 +0800, "Holger Freyther" <zecke at selfish.org> wrote: > > The other problem is with the 20 paging requests every two seconds I'm > creating a RACH DoS for my BTS to a point that I think (didn't bother to > do the easy math, and I don't have the spec here right now) we have two > MS picking the same random number. At least the symptom is that even if > we assign a channel, it gets closed down with a RF Failure. I wonder how frequently it happens with 20 MS that a RACH is sent on the same frame and with the same random number. There are at least 16 possible random numbers for the "Answere to Paging" Channel Request and there are 27 frames in the MF to chooses from (in the "Combined Configuration"). Do you use the same phones for testing and does the RF Failure happen frequently (this probably would mean a bad random number generator in this phone firmware) ? Also I would expect that two RACH burst will disturb each other, at least in a testing environment where all the MS have the same distance to the BTS and send with the same power. Best regards, Dieter -- Dieter Spaar, Germany spaar at mirider.augusta.de