Hi Dario,
which is the environment that you are using for the tests? (eg. OpenBSC or a PLMN: in this
case which one? 01, 10, 88)
Are you trying to just sniff the air or also stimulating the traffic with your own ME?
Good results depends from many factors:
- If the "session" is hopping through chans or not;
- If the ME supports only GPRS or not;
- If you are making tests on your own lab's environment or a PLMN;
- an other related with the osmocombb's ME and the cable used.
In case you don't use OpenBSC with nanobts or BS-11, i would suggest use to use an old
ME that supports only GPRS and not EDGE, thus u will avoid it to use EDGE's
coding-schemes (eg. i obtained good results with an old gprs usb modem on PLMNs). Then i
would suggest you to find an ARFCN of a PLMN that doesn't hop: i found some good ones
by checking with a Blackberry's Field Test [1].
[1]
http://i41.tinypic.com/20huagj.jpg
Cheers,
Luca
I'm still not able to sniff enough data to
reconstruct TCP sessions.
I can get datagrams (even TCP), but they look like "sparse" datagrams. Even
using 2 sniffing phones I have a slightly better result, but not enough to consider it
satisfying.
Are there some other steps that can be done?
Is there anyone, other that gprs decoder authors, able to make it completely working?
Thanks.
Dario.