baseband-devel

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2022 discussions

Re: 900MHz packet radio?
by Dieter Spaar 01 Sep '11

01 Sep '11

Hello Paul, On Thu, 1 Sep 2011 13:41:11 +0930, "Paul Gardner-Stephen" <paul(a)servalproject.org> wrote: > > So, as the open-source group with the most experience reprogramming > baseband radios, what is the feasibility of creating a > proof-of-concept using the types of phones you already work with to > send and receive arbitrary data packets without reliance on a cell > tower (even for time synchronisation)? It depends a lot on what you want to use on the lower layers (e.g. Modulation). The TI Calypso based phones have a built-in GMSK hardware modulator, so it is GMSK. Also the symbolrate is fixed to the one used by GSM. Then there is the DSP which does the signal processing work. Its again tied to the GSM standard (format of the burst and length). It might be possible to put something else into the relativ small RAM inside the DSP, but this could be a huge effort. Besides that you have to modify the hardware of the phone (remove a filter) so that the phone can receive another phone. But this is probably the smallest problem of all. Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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Re: GRPS decode - trying to download firmware to C123
by smithmr103＠gmail.com 01 Sep '11

01 Sep '11

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GRPS decode - trying to download firmware to C123
by smithmr103＠gmail.com 01 Sep '11

01 Sep '11

Hello list, I'm newbee so excuse me for my very basic question. I follow all the instructions on srlabs.de/gprs given by Karsten I have a C123 and a USB / jack 2.5mm - pl2303 based :( All steps are fine until I try to programm the compal ram ;) ./host/osmocon/osmocon -m c123xor -p /dev/ttyUSB0 ./target/firmware/board/compal_e88/layer1.compalram.bin I get : ... PROMPT1... ... PROMPT2... handle_write(): xxxx bytes (xxxx/yyyy) ... ... handle_write(): xxxx bytes (xxxx/yyyy) Received 1 byte : xx Received 1 bytes : yy ... ... Finally I received e.r.r.o.r (byte by byte) NOT ACK RECEIVED... I can also get (not with the same firmware...) : ... PROMPT1... ... PROMPT2... handle_write(): xxxx bytes (xxxx/yyyy) ... ... handle_write(): finished and then... nothing... I'm going to test the cable, as Philipp has told to Pavel. I also bought a RS232 / Jack unlocking Motorola (C123) cable and I own a BlackBox FTDI based USB/RS232 cable... So I'll test it as soon as I receive the cable. Do you think is a matter of cable, who is supposed to be osmocom compatible, or a phone issue or even the USB port... ? Thank you very much for your help and excuse me again with this kind of 'stupid' question about cable. I read almost all the subjects, I did a lot of experimentations in a lot of git branch (master, testing, burst_ind - of course not working with PL2303 ... + d1cb8ea9b784c7acbafbb2fdcedbdf4655c2f6f5 not working too) I think it must work at least in the master branch... Smith

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Suggestion from the PR department
by Ingo Albrecht 01 Sep '11

01 Sep '11

Hey guys I've been noticing the neverending stream of serial cable issues popping up here. To end this, I have a suggestion: how about checking the cable type via sysfs? Greets prom

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GPRS decode:FTDI cable
by list_mailing＠libero.it 30 Aug '11

30 Aug '11

Please, can someone suggest a model for the FTDI cable? I have found different types on internet, but I'd like to buy one it will be definitively ok. Thanks in advance.

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R: Re: GPRS Vs EDGE - Trying to decode my own sessions
by Luca Bongiorni 30 Aug '11

30 Aug '11

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 >

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OT: Chinese C118 supply?
by Harald Welte 29 Aug '11

29 Aug '11

Hi all, at the CCC Camp two weeks ago, a Chinese guy approached me, stating that there he has contacts to a considerable supply of very inexpensive C1xx family phones in China. Unfortunately we didn't exchange contact details, so I'm trying this route. If you are the person that has talked to me about this topic, pleaes contact me by private e-mail. I would love to use this opportunity to provide inexpensive C1xx phones to the larger OsmocomBB user community. Thanks in advance, Harald -- - Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)

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GPRS Vs EDGE - Trying to decode my own sessions
by Luca Bongiorni 28 Aug '11

28 Aug '11

Hi all, i'm testing gprsdecode with osmocomBB and using the samples provided from Nohl works well. Using a Blackberry 8300 and my Wind's sim, i tried to dump some my internet sessions. Unfortunately even if i'm locking the MS to a fixed ARFCN, it is "upgrading" from GRPS to EDGE very quickly and i cannot dump an entire session and then decode it on gprsdecode. The only datas i could decode and view on wireshark are few "malformed packets". As i suppose the problem is that i'm not able to fix the MS to work only on gprs. Which phone did Luca use to make his tests? (just a simple one that was not EDGE capable? ) Which was the successful-rate of (third-party) decoded sessions? I'm asking it, because i'm not even able to "see" other's phones sessions... ok, could be possible that everyone else is using only EDGE... but seems strange. Have you some hints for that? Thank you for attention. Regards, Luca

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Re: neighbour cell measurement
by Dieter Spaar 27 Aug '11

27 Aug '11

Hello Andreas, hello Harald, On Thu, 14 Jul 2011 13:44:16 +0200, "Harald Welte" <laforge(a)gnumonks.org> wrote: > > The patches look fine to me. I'd wait for another day if Sylvain or > Dieter have any comments, but otherwise they can be merged. The patches are fine for me. Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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Fwd: Re: neighbour cell measurement
by Andreas Eversberg 27 Aug '11

27 Aug '11

xuchenyu wrote: > > Hello! I think that your neighbour cell measurement code is at the branch > > remotes/origin/laforge/neigh_sb > > > hi xuchenyu, this in an incomplete an experimental code. once finished, it will measure neighbour cells during a call. neighbour cell measurment is supported in idle mode only, if you use master branch, or better "sylvain/testing" branch for some fixes and SIM support. you can enable neighbour cell monitor at VTY: "monitor network 1". regards, andreas

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