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

29 Aug 2011

Hi all,

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

http://pastebin.com/pepx0tdv

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.

Regards,
Luca

...
  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