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Reply To: Data problems on fast moving mobiles


hi jason,

are you sure that the problem comes from the speed of the MS, and not from the fact that the frequencies are interfered ?
– try to stop the car when you see this problem, and check whether it is still happening.

how fast is your going ?

Are we talking about EGPRS (MCS1-9) or GPRS (CS1-4) ? Which coding scheme is used during the problem ?
I’ve read about the doppler effect, but it seems that it doesn’t have any impact on GSM. The example was at 100km/h, it generated a frequency offset of 90Hz… 90Hz compared to 200kHz… it’s neglictible.
So I would really focus on an interference problem rather than a speed problem… but maybe I’m wrong.