Hi,
Lately I have been looking at the GSM traffic through wireshark. In every packet, wireshark tells me about the frame number.
But a paging message is spread over four frames. (You need to read four frames to get a single paging message.)
So which among these four frames does the frame number displayed in wireshark correspond to for the paging message?
Regards, RM
Hi,
So which among these four frames does the frame number displayed in wireshark correspond to for the paging message?
I think we take the frame number of the first burst but I'm not sure ... In any case there can't be ambiguity because all the 4 bursts are always "aligned" on the multiframe. (See GSM 05.02 series for multiframe timings)
Cheers,
Sylvain
Hi,
... In any case there can't be ambiguity because all the 4 bursts are always "aligned" on the multiframe. (See GSM 05.02 series for multiframe timings)
As far as I understand, all the four burst are aligned on the frame if you are listening to C0T0.
But paging bursts can also appear on C0T2, C0T4 and C0T6 depending on channel configuration.
Regards, RM
baseband-devel@lists.osmocom.org
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R M -
Sylvain Munaut