R: Re: GPRS Vs EDGE - Trying to decode my own sessions

Luca Bongiorni luca.bongiorni1 at studenti.unimi.it
Mon Aug 29 21:00:23 UTC 2011

Hi all,

just to explain what i mean, i've attached a sample and the log from layer23.


As you can see from the log i got the immediate-assign. and the i can see the slots.

The only thing that i could be strange is the signal strength that sometimes is good and sometimes reaches -100 dBm.

Here is the gprsdecode's output: http://pastebin.com/p7XrtKAt

Obviously i tried other ARFCNs of all operators (with different c118/c123, FTDI cable) and i got always the same behaviour.

Have you some hints to suggest?

Tomorrow i will try with some DP-L10 and pubblish the relative results.

P.S: As i already stated, Nohl's samples are well decoded and showed into wireshark.


> Hi Harald,
> Actually i could use some old phones that supports only GPRS (e.g. t68i, t39m, etc..), but these phones are not enough useful and i will explain why:
> - i would like to use a phone that has field-test engineering;
> - i would like to set the phone to camp only in a fixed ARFCN.
> I was also trying a Pirelli DP-L10, but unfortunately i can only fix the band and not the arfcn. 
> Btw... after a while i finally found how to force my Blackberry to work on GPRS on a fixed arfcn:
> - Select an arfcn;
> - Lock to this cell;  [ http://tinyurl.com/3dcc6vm ]
> - Disable Uplink 8-PSK; [ http://tinyurl.com/3dxp85d ]
>  Finally the phone is ready to start the tests. [ http://tinyurl.com/3rhldrn ]
> As you can see, that engineering field-test is very useful because is showing which Coding Scheme and TS are used.
> Unfortunately at this point... even if i tried a lot of times, i could see imm-ass, the TS, but when i'm trying to decode the dumps... nothing is decoded and i cannot even decode third-party sessions that obviously i could find on the same arfcn that i'm using.
> So, at this state of art, I could decode only samples released from Nohl.
> Someone else is having same problems?
> Regards,
> Luca
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