baseband-devel September 2011

baseband-devel@lists.osmocom.org

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Engagetted !
by Sébastien Lorquet 14 Oct '25

14 Oct '25

http://www.engadget.com/2010/12/29/researchers-eavesdrop-on-encrypted-gsm-c… Congrats!

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Please can anyone advise me - FMTOOL Error and no further processing
by Raz Sharif 25 May '16

25 May '16

Dear all, I vae the C115 with a T1 USB to Serial cable with the Prolific chipset. When i run osmocon i get :- an its just sits there with no further processing. ./osmocon -p /dev/ttyUSB0 -m c123xor ../../target/firmware/board/compal_e88/loader.compalram.bin read_file(../../target/firmware/board/compal_e88/loader.compalram.bin): file_size=17120, hdr_len=4, dnload_len=17127 read_file(../../target/firmware/board/compal_e88/loader.compalram.bin): file_size=17120, hdr_len=4, dnload_len=17127 got 1 bytes from modem, data looks like: 00 . got 2 bytes from modem, data looks like: 2f 00 /. got 1 bytes from modem, data looks like: 1b . got 3 bytes from modem, data looks like: f6 02 00 ... got 1 bytes from modem, data looks like: 41 A got 1 bytes from modem, data looks like: 01 . got 1 bytes from modem, data looks like: 40 @ Received PROMPT1 from phone, responding with CMD got 1 bytes from modem, data looks like: 66 f got 1 bytes from modem, data looks like: 74 t got 1 bytes from modem, data looks like: 6d m got 1 bytes from modem, data looks like: 74 t got 1 bytes from modem, data looks like: 6f o got 1 bytes from modem, data looks like: 6f o got 1 bytes from modem, data looks like: 6c l Received FTMTOOL from phone, ramloader has aborted got 1 bytes from modem, data looks like: 65 e got 1 bytes from modem, data looks like: 72 r got 1 bytes from modem, data looks like: 72 r got 1 bytes from modem, data looks like: 6f o got 1 bytes from modem, data looks like: 72 r got 1 bytes from modem, data looks like: 00 . got 1 bytes from modem, data looks like: 00 . I think the cable is ok as when i run my fingers on the tip i get random Zeros so it appears to be talking to the cable. Also when i tried to run Mobile i get the :- even though i created the Mobile.cfg file in /etc/osmoco Failed to parse the config file: '/home/raz/.osmocom/bb/mobile.cfg' Please check or create config file using: 'touch /home/raz/.osmocom/bb/mobile.cfg' I have spent some hours researching the lists and trying various things to no avail but I want to continue until I resolve this issues and use this great stack to learn about the GSM network. Please advise. Great full for any help or pointers but this maybe a timing issue that is difficult to debug. Thanks Raz

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cell re-selection
by Andreas.Eversberg 05 Mar '16

05 Mar '16

hi, i did a lot of resarch and testing on cell selection and re-selection process the last two week. the cell selection process, network selection process (manual and automatic) and mobility management process were already implemented in OsmocomBB a long time, but turned out to be buggy and incomplete. i made test drives to check the process and debugged it. the re-selection process is new. it is used to track surrounding cells while listening to the BCCH of the current cell (camping on a cell). special extension to the layer1 firmare is used to measure neighbour cells. if an neighbour cell becomes 'better', the mobile switches to that cell, depening on different criteria. now it is possible to move with OsmocomBB. the re-selection process is not handover! handover is a process where a phone switches between cells while doing a call. handover is one next step to implement. the process is a little more complex, because it requires not only neighbour cell measurements, but also syncing to them without interrupting the traffic channel. most layer 3 stuff of handover is already implemented. if you like to play and test your moving OsmocomBB, you can check out the "jolly/roaming" branch. it contains the extension to layer1, as well as sim reader and fixes from "sylvain/testing" branch. use both "mobile" and "layer1" firmware from this branch. in order to see some process at VTY, you can do: enable monitor network 1 (continously display the strongest cell and neighbour cells) show ms 1 (to see current states) show neighbour-cells 1 (to see a more detailed current list of neighbours) andreas

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AW: The call has been rejected
by Andreas.Eversberg 12 Apr '13

12 Apr '13

hi josephli, > Read stored BA list mnc=01 the mobile application stores the last cells and neighbour cells (band allocation) of each network. this way the scanning is much faster when restarting. because you use the SIM card with MNC == 02 the first time, there is no band allocation stored for that. the mobile will do a full scan in this case. > while the sim card service I am tesing is actually with mnc 00 and 02. i know that MNC == 0 will not work until i commited improvements of cell selection process last sunday. you should retry that, but first try with an MNC > 0. can you provide debug output when trying a call? also can you provide VTY output of "show ms" before you make the call? regards, andreas

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status report layer1 and layer23
by Andreas.Eversberg 11 Apr '13

11 Apr '13

hi, i just fixed some locking issues the last days. fix will follow. it took a bit longer, because there were some race conditions. it took up to about one hour until it crashed. my way to detect the area where the crash happened, was to turn on buzzer before that area, and turn it off after that area. after many hours of approximation, i finally found out that the major crash happend during _talloc_zero. (first it looks for a free memory chunk, then it allocates it.) since it can be called from all contexts (main, irq, fiq), it need to be locked against any interrupt, otherwise the memory chunk can be assigned multiple times. (the process of _talloc_free is "atomic" and requires no locking.) because it seems pretty stable, i think it is time to merge some branches into the master. (i made a 6 hours call yesterday. and no crash after bugfix ever since.) i will do that together with sylvain, if we find the time this weekend. currently i use the jolly/voice together with the sylvain/traffic branch. i am able to use an isdn phone togehter with linux-call-router and make/receive calls. audio is passed both ways. i think this is a stage where it actually become "usable". (if not moving arround.) one of my major work for the next weeks/months will be the neighbour cell measurement, cell re-selection, and handover. this is essential when moving with the phone. regards, andreas

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Receiving on TS=1 ?
by Sylvain Munaut 20 Jul '12

20 Jul '12

Hi, I've hacked something together to quickly test non-combined CCCH. However, I've hit a problem when trying to receive anything on another timeslot than 0. The TX side seems to work fine as the BTS can see my location update request and answers with a reject, but on the MS side, I never see the reject and wireshark only shows invalid incohrent data on the RX. The frames for SDCCH/8 show really nothing valid (looks like random bytes), things like 09 80 7f 47 49 06 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 09 00 47 d5 2d 06 1e 00 00 69 7c a0 91 3d 22 ff ab fe 6c 4f 56 4f 36 ... while the frames for the associated SAACH show at least something gsm-like : 03 03 01 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b but that's not quite a SI5/6 ... To RX/TX on TS=1, I just delayed the RX/TX window by 625 bits (4 * 156.25) when I'm in dedicated channel mode by chaning the 'start' in l1s_tx_win_ctrl / l1s_rx_win_ctrl Is there something else that should be done ? Cheers, Sylvain

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burst_ind and TCH
by Mad 11 Jul '12

11 Jul '12

Hi Sylvain, hi list! I'm experimenting with burst_ind and TCHs right now and ran into some problem I couldn't solve yet. After receiving an Assignment Command for a hopping TCH/F I call l1ctl_tx_dm_est_req_h1() with all necessary parameters and tch_mode GSM48_CMODE_SPEECH_V1 or _EFR. After that I do get burst indications containing the received bits on up- and downlink for the active arfcn on each consecutive frame number. BUT the rx level measurements are most of the time very low and sporadic higher, surely not from that nearby bts and the very close cellphone. It looks like the layer1 doesn't "hit" the right timeslot on the right arfcn at the right time. There are some possible sources of error leading to that, like hopping parameters, channel number and MA list. But I checked these and I took all of them directly from the ASS CMD, the MA as word list in ascending order, like in layer23 IMM ASS handling. The specific AC doesn't have any specialties like Starting Time or "before time" parameters. So my question is if there is some obvious pitfall I'm missing and are there any suggestions how to debug that? Regards, Mad

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bursts****.dat
by Victor P 06 Jun '12

06 Jun '12

Hi, I am trying to use burst_ind branch of osmocom. I have noticed that layer23 creates bursts****.dat files when it indicates uplink. What data are written to these files and what should I use to see its data? Thank you.

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Use OsmocomBB as OpenBTS / airprobe clock generator
by Harald Welte 15 Mar '12

15 Mar '12

Hi! Recently we've had the idea of using OsmocomBB with a simple firmware that synchronizes to an existing GSM networks FCCH and use the resulting 13MHz clock to drive the USRP for airprobe or OpenBTS. Ideally, we would even use the Calypso-internal PLL (for ARM or DSP) to multiply it up to the required 52 MHz. However, neither the Openmoko nor the Compal/Motorola phones expose any of the 3 clock output pads :( So the only choice is to use something along the lines of the http://focus.ti.com/docs/prod/folders/print/cdcvf25084.html as a quad clock multiplier and attach it to the CLK13OUT signal of the phone. The chip is available for 9 USD in single quantities at digikey, and possibly cheaper at other sources. Combined with a sub-20EUR phone it might be a very cheap but still accurate frequency source for OpenBTS - at least as long as there are any commercial gsm networks available. Regards, 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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osmocombb and usrp
by Paul Lambert 14 Feb '12

14 Feb '12

Hello, I have a ursp1 working fine and I want to use my c123 to conenct to it with osmocombb. Now I face some problems. First of all I have no sim, so I do: sim testcard 1 001 01 The usrp runs a testnetwork (001 01) I don't know how I can associate with the usrp. I tried: network search (lot of output and also my testnet) network show (nothing happens) network select 1 001 01: Network not in list! Any idea what I'm doing wrong? Would be really Cool if i could use opensource only. With best regards, Paul

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baseband-devel September 2011