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2023 discussions

interact osmocombb with OpenBTS
by josephli 18 Aug '11

18 Aug '11

Hello every, I recently set up the equipment and tried to communicate with the public PLMN and it worked well at that stage. Then I tried to camp on the OpenBTS after switching on the SIM card. When it progressed to location updating request step, the OpenBTS can not receive identity response from MS. The timer t3210 was fired as long as passing a certain period of time and location updating request was sending again iteratively. Anyway location updating was failed. I checked through wireshark from the mobile phone side, showing that MS did send the response however OpenBTS did not receive somehow. Also the timing advance (ta) during that process became 127 which was abnormal, out of the maximum value of 63. I suspected it was also caused by the failure of reception. Is there something wrong about the decoding at OpenBTS side or data packing error at MS side? Is there any way to fix it? Many thanks, Li -- View this message in context: http://baseband-devel.722152.n3.nabble.com/interact-osmocombb-with-OpenBTS-… Sent from the baseband-devel mailing list archive at Nabble.com.

4 5

Failing channel assignment
by Dieter Spaar 12 Aug '11

12 Aug '11

Hello, I noticed some issues in the following situation, I used the "testing" branch (I think it affects both current "testing" branches): - the signalling channel is an SDCCH/8 on a timeslot different from TS0, for example on TS4 - an ASSIGNMENT COMMAND switches to another channel on a different TS than the SDCCH/8, e.g. to TS2 Now the following two problems can happen: 1.) The ASSIGNMENT COMMAND releases the SDCCH/8 with an L1CTL_DM_REL_REQ. Depending on when the L1CTL_DM_REL_REQ is received, it could be that there are still burst scheduled for transmit (e.g. for the SACCH). Due to the L1CTL_DM_REL_REQ, rfch_get_params() will return wrong data (l1s.dedicated.type is now set to GSM_DCHAN_NONE) and the transmit of the bursts happens on the wrong ARFCN and/or TS. My temporary workaround is to clear every item in the scheduler including the current bucket when a L1CTL_DM_REL_REQ is received, this action requires to disable the FIQ, otherwise problems might happen. 2.) There is some code to check for a switch to a lower timeslot in check_lost_frame(). However it can happen that this code gets not triggered although it should: The ASSIGNMENT COMMAND causes a L1CTL_DM_REL_REQ, l1s.dedicated.type is now GSM_DCHAN_NONE ("0"). The next call to check_lost_frame() resets "last_ts" to 0. Now the new channel is assigned (in the example from above its a switch from TS4 to TS 2) and a "LOST" occures, however the required increment of the GSM time does not happen because "last_ts" is 0 although it should be 4. My current workaround is to not reset "last_ts" to 0 in check_lost_frame() but during "L1CTL_RESET_REQ: FULL!". I don't post any patches because my changes are really just ugly workaround which seem to work in (most) situations where it I otherwise observe failures. To really solve this issues something else should be done, maybe put the whole switch of a channel into an atomic operation instead of doing several operations (this is just an idea, maybe there are better solutions). Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

1 0

SMS status?
by Andrew Reusch 12 Aug '11

12 Aug '11

Hi all, I work in a research lab and we're interested in using your stack to send SMS. I've got some time on my hands and a working OpenBTS stack (USRP), so I will probably go ahead and start implementing it in the mobile app. Before I start I just wanted to ask first about the status of mobile-originated SMS? I saw some traffic in the archives a few months back from Gianni about mobile-terminated SMS, but nothing recent about mobile-originated SMS. Barring that, any suggestions on where to start? :) I'm kinda new here. Assuming I get something solid working, I'd of course be willing to contribute it back to the codebase. Thanks, Andrew

3 4

osmocomBB purpose & GSMs
by aik821 aik821 11 Aug '11

11 Aug '11

Hi all, I'm new in these forums and osmocomBB. I was wondering, how does osmocomBB work. install 2 packages, one on the phone and the other on a PC Host? And then you are able to call/sms and anything a GSM phone can do? And you can change the GSM protocol/stack if you want to? So pretty much your PC becomes a GSM terminal? also Are there any simple guides to setup the whole thing? Ahmed

2 1

tx signal strength
by screaming-pain 11 Aug '11

11 Aug '11

Hi all, probably is a silly question but is there a way to set the tx signal strength of the ms? thanks, loretta -- View this message in context: http://baseband-devel.722152.n3.nabble.com/tx-signal-strength-tp3245572p324… Sent from the baseband-devel mailing list archive at Nabble.com.

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Loading firmware on C118
by Павел Батурко 10 Aug '11

10 Aug '11

Hi all, I'm using Motorola C118 and Prolific PL2303 USB to serial adaptor on Ubuntu 10.10. I'm trying to run $ ./osmocon -p /dev/ttyUSB0 -m c123xor ../../target/firmware/board/compal_e88/loader.compalram.bin and I got got 1 bytes from modem, data looks like: 00 . I press power button and nothing happens. If rub the connector - lines such as I provided above are appears. Is it means that cable is ok? And what could be the problem? Thanks, Pavel

1 0

Bug in frequency list generation of libosmocore
by Dieter Spaar 10 Aug '11

10 Aug '11

Hello, there is a small bug in the calculation of the "Range 1024" format frequency list. A patch is appended. I post it here because I found it while working with OsmocomBB. Best regards, Dieter Dieter Spaar, Germany spaar(a)mirider.augusta.de

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Fwd: i got C115 device . now i am searching for the cable to flash the Build on to the device.
by Alvin Schurman 09 Aug '11

09 Aug '11

---------- Forwarded message ---------- From: Alvin Schurman <alvin.schurman(a)gmail.com> Date: Tue, Aug 9, 2011 at 5:37 PM Subject: Re: i got C115 device . now i am searching for the cable to flash the Build on to the device. To: nagesh reddy <karnatinagesh(a)gmail.com> I too have a C115 at home. I ordered it to flash and so I could experience a little hands-on learning with GPRS. The first thing I noticed was that there was no usb port or data cable input of any kind on the phone. After a little digging, I found that it has a line of JTAG pads under the battery. I wasn't equipped or trained to tackle JTAG so I stopped where you are. Hopefully, you'll get an answer so I can pick up where I left off when I'm back home with my C115. Cheers, Al On Tue, Aug 9, 2011 at 9:48 AM, nagesh reddy <karnatinagesh(a)gmail.com>wrote: > Hi Guys, > > > i got the Motorola C115 device and i want to flash the Build into the > device. from where can i get the cable > so that i can flash the stack and seee. > > > > regards, > nagesh. > > >

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i got C115 device . now i am searching for the cable to flash the Build on to the device.
by nagesh reddy 09 Aug '11

09 Aug '11

Hi Guys, i got the Motorola C115 device and i want to flash the Build into the device. from where can i get the cable so that i can flash the stack and seee. regards, nagesh.

2 1

RRLP support in osmocombb
by Akib Sayyed 07 Aug '11

07 Aug '11

i am bit new to GSM and osmocombb. does osmocombb support RRLP protocol. @herald i saw in your presentation that we can send custom time advance. does that related to RRLP. also can we fake position using osmocombb? -- Akib Sayyed Matrix-Shell akibsayyed(a)gmail.com akibsayyed(a)matrixshell.com Mob:- +91-966-514-2243

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