- OpenBSC - lists.osmocom.org

osmo-trx issues
by Max 16 Jun '16

16 Jun '16

Hi. While running osmo-trx with B200 I've noticed following log messages repeated multiple times: 1) WARNING 3011271488 16:59:00.1 Transceiver.cpp:674:pullRadioVector: Clipping detected on received RACH or Normal Burst 2) ERR 3011304256 16:58:12.9 UHDDevice.cpp:1512:write: Skipping buffer data: timestamp=210353475 time_end=202360063 How bad is that: are those break everything completely or can be sometimes ignored? What could be causing it and what can be done to try to fix it (hw/sw)? Note, I run it as follows: sudo chrt 20 ./Transceiver52M/osmo-trx -- Max Suraev <msuraev(a)sysmocom.de> http://www.sysmocom.de/ ======================================================================= * sysmocom - systems for mobile communications GmbH * Alt-Moabit 93 * 10559 Berlin, Germany * Sitz / Registered office: Berlin, HRB 134158 B * Geschaeftsfuehrer / Managing Director: Harald Welte

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OpenBSC
by sms makhof 15 Jun '16

15 Jun '16

Hi all I am installing OpenBSC.I just following http://openbsc.osmocom.org/trac/wiki/Building_OpenBSC (I am just Building libosmocore, Building libosmo-abis, Building libosmo-netif, Building OpenBSC and install library.) But when I tried to run OpenBSC,I encounter with this error(problem). user12@ubuntu:~$ cd '/home/user12/openbsc/openbsc/src/osmo-nitb' user12@ubuntu:~/openbsc/openbsc/src/osmo-nitb$ sudo ./osmo-nitb <0005> bsc_init.c:492 Failed to parse the config file: 'openbsc.cfg' Or how do I run the software(OpenBSC)! Or do I have to install something missing? Note: My Linux is version 12.04 . Please help me. thank you.

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RRLP encoding related
by mike sbor 11 Jun '16

11 Jun '16

Hello, I am trying to generate ephemeris data (that I get from a ublox receiver) in RRLP format. I have came across the following discussing n openbsc mailing list. http://openbsc.osmocom.narkive.com/8rLcJRc2/rrlp-ephemeris-data#post9 at the end of the discussion, Dieter Spaar wrote that he found a bug fix for a problem. Can you please guide me about where to look for this feature in the git repository? In the discussion, Slyvian has attached a project but I am not sure whether this bug fix is there or not I am planning to buy/manufacture the board that Slyvian has designed for ublox lea 6 and try producing assisted gps data in rrlp format http://openbsc.osmocom.org/trac/wiki/osmo-lea6t-gps Thanks a lot for your help rifo

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osmo-bts - branch:laforge/virt_phy - questions on virtual layer implementation
by Sebastian Stumpf 08 Jun '16

08 Jun '16

Hi, as a part of my master thesis I am currently trying to complete the implementation of the virtual physical layer in the laforge/virt-bts branch in osmo-bts.git. I already set up the projects and analyzed/debugged some of the code. Now I have a few things to ask or be confirmed by the pros :). 1. The sent messages on the virtual physical layer will be wrapped in a GSM_TAP header. I would like to analyze and implement the Uplink (MS->BTS) on the BTS side first, by sending dummy messages a small program and then processing them in the BTS. Unfortunately I don't have these dummy messages. Can anyone of you provide me with some examples for the msgs coming from the MS side (Access Burst on RACH, Uplink Burst on TCH, RSSI on SACCH, Location Update Request on SDCCH, Authentication Response on SDCCH) or tell me how else I can get my fingers on them? 2. Did I correctly understand that the virt_um_rcv_cb() method in l1_id.c will unwrap incoming GSM_TAP messages and distribute/forward them to layer2? Is the correct l2 interface to use l1sap.c from the common part? E.g. l1sap_ph_rach_ind(..) for incoming RACH msg from MS. 3. Does any logic to unwrap and forward GSM_TAP messages already exist or was that solely used for logging via wireshark by now. 4. I added some comments to the code, mostly to document my own unterstandings. But as I am no expert yet, they might contain some logical errors. Can I keep these in the code when commiting or better remove them? 5. Should I create a new branch for my work (e.g. stumpf/virt_phy) or commit to the existing? Not so important Questions: 6. I had a compilation error caused by 2 missing methods in the main.c.I added empty method bodies for bts_model_phy_link_set_defaults(..) and bts_model_phy_instance_set_defaults(..) and everything seems okay so far. Can I do that or did I miss something here? 7. To check if I receive incoming messages from the registered virtual UM multicast socket I periodically wrote a dummy text to it with a small program. As the registered callback method virt_um_rcvcb(..) wasn't called I checked the initialization of the multicast socket (virtual_um.c->virt_um_init(..)). After some research it seems that mcast sockets do not support a call of connect() after a bind(). Removing the call that connects the socket to the multicast group and port, seems to work. Is that okay or are there any problems I could run into by not connecting to the mcast socket? I think connect() is usally used on tcp sockets. Thank you very much in advance for your answers! Kind Regards, Sebastian Stumpf

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fn-advance value
by robert 07 Jun '16

07 Jun '16

Hi, in some tutorials fn-advance value is set to 20 and in some other tutorials it is set to 30. What is better to choose and does it really affect the performance of the BTS. Best regards,

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jenkins build stuck?
by Neels Hofmeyr 07 Jun '16

07 Jun '16

It seems that http://jenkins.osmocom.org/jenkins/job/OpenBSC-gerrit/186/ is stuck: Configuration OpenBSC-gerrit ? --disable-mgcp-transcoding,--enable-smpp,linux_amd64_ubuntu_1504 is still in the queue: Ubuntu-1504-64 is offline and http://jenkins.osmocom.org/jenkins/computer/Ubuntu-1504-64/log : ERROR: [06/06/16 15:46:34] [SSH] Error deleting file. java.util.concurrent.TimeoutException at java.util.concurrent.FutureTask.get(FutureTask.java:205) at hudson.plugins.sshslaves.SSHLauncher.afterDisconnect(SSHLauncher.java:1279) at hudson.slaves.SlaveComputer$3.run(SlaveComputer.java:618) at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) [06/06/16 15:46:34] [SSH] Connection closed. ERROR: [06/06/16 15:46:34] [SSH] Error deleting file. java.lang.IllegalStateException: Cannot open session, you need to establish a connection first. at com.trilead.ssh2.Connection.openSession(Connection.java:1124) at com.trilead.ssh2.Connection.exec(Connection.java:1551) at hudson.plugins.sshslaves.SSHLauncher$3.run(SSHLauncher.java:1259) [06/06/16 15:46:34] [SSH] Opening SSH connection to 127.0.6.1:2222. at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) -- - Neels Hofmeyr <nhofmeyr(a)sysmocom.de> http://www.sysmocom.de/ ======================================================================= * sysmocom - systems for mobile communications GmbH * Alt-Moabit 93 * 10559 Berlin, Germany * Sitz / Registered office: Berlin, HRB 134158 B * Geschäftsführer / Managing Directors: Harald Welte

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about rssi encoding of ublox raw data
by mike sbor 06 Jun '16

06 Jun '16

Hello, I am trying to generate ephemeris data (that I get from a ublox receiver) in RRLP format. I have came across the following discussing n openbsc mailing list. <goog_1065096623> http://openbsc.osmocom.narkive.com/8rLcJRc2/rrlp-ephemeris-data#post9 at the end of the discussion, Dieter Spaar wrote that he found a bug fix for a problem. Can you please guide me about where to look for this feature in the git repository? In the discussion, Slyvian has attached a project but I am not sure whether this bug fix is there or not Thanks a lot rifo

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Re: speech frame loss compensation
by Alexander Chemeris 03 Jun '16

03 Jun '16

On Jun 1, 2016 9:37 PM, "Holger Freyther" <holger(a)freyther.de> wrote: > > > > On 01 Jun 2016, at 17:18, Max <msuraev(a)sysmocom.de> wrote: > > > > Hi. > > > > > Right now in osmobts when sending/receiving frames with osmo_rtp_* it's > > assumed that no frame is lost and timestamp is always advanced in 160ms > > steps. In practice (especially when DTX is in place) frames do get lost > > so we have to adjust the step to compensate. > > > > > > However the result sound not much better than using hardcoded value > > which suggest that I might be doing FN -> ms conversion (or smth else) > > wrong. Any ideas/advices? > > Don't do it. I don't find the relevant spec within the time frame I had but I think I recently saw a piece of documentation that SQN (and timestamp) should only be incremented if data is being sent. > > Either in the RTP RFC, RTP AMR RFC or the A over IP spec.. I think I saw it while going through the documents Harald had pointed while I introduced my ideas for the SIP connector. > It's in the RTP RFC. Sequence number is incremented by 1 with every packet, even if the packet is sent after a long pause (due to DTX). This way you know when you miss a packet. Timestamp is measured in samples and this is incremented by a number of samples since the last packet. This way you know when to start playing the packet in case of DTX. A proper RTP library or rather a jitter buffer should handle this automatically, but I'm not sure how does ortp handle it. Please excuse typos. Written with a touchscreen keyboard. -- Regards, Alexander Chemeris CEO Fairwaves, Inc. https://fairwaves.co

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building 3G now needs --enable-iu
by Neels Hofmeyr 03 Jun '16

03 Jun '16

Dear 3G folks, this is to draw your attention to the new --enable-iu flag added to openbsc's ./configure on the sysmocom/iups branch (and awaiting approval on gerrit right now https://gerrit.osmocom.org/189 ). So if you update your sysmocom/iups branch and want to re-build for 3G, you now have to pass --enable-iu to ./configure, or no Iu* interface support will actually be built. (This means we can omit libasn1c etc. for a 2G build.) * We should probably add --enable-iu to the jenkins build soon -- either to always include it, or if we have the build time, as another matrix multiplier, I mean build once with --enable-iu and once without. It would make sense to add --enable-iu to jenkins before I go on to submit any more IuPS branch commits for review. * But we should merge the 3G branches in the other repositories to their masters before adding --enable-iu to the jenkins build: asn1c.git aper-prefix libosmo-sccp.git sysmocom/iu libosmo-sigtran.git sysmocom/sctp Any help there would be appreciated. * To be able to add --enable-iu to jenkins, we need to add asn1c, libasn1c, libosmo-sigtran and osmo-iuh to the build. I will have my attention directed mostly to other tasks, but I hope we can get these things done along the way. ~Neels -- - Neels Hofmeyr <nhofmeyr(a)sysmocom.de> http://www.sysmocom.de/ ======================================================================= * sysmocom - systems for mobile communications GmbH * Alt-Moabit 93 * 10559 Berlin, Germany * Sitz / Registered office: Berlin, HRB 134158 B * Geschäftsführer / Managing Directors: Harald Welte

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Gerrit mails, from address, verbosity, etc
by Holger Freyther 02 Jun '16

02 Jun '16

Hi, we have the first round of contributions through Gerrit and maybe now is a good time to look at the mail setup. My goal was to: * Have diff's/patches be sent to the MailingList to see what is going on * Have comments be sent to the MailingList to have people learn from feedback In terms of technology Gerrit offers us the following notifications[1] new_changes Somebody created a new change new_patchsets Somebody updated/added a patch(set) to a change all_comments Somebody but jenkins commented submitted_changes Somebody has pushed the submit button and it is in abandoned_changes Somebody gave up on the change all Everything Currently we are using "all" and maybe we want to limit it to "new_patchsets" and "all_comments". "all_comments" is a bit troublesome as it includes empty messages like "+2" with actual review comments. What would be the close to ideal solution? * Be able to reply by mail to changes (most likely not to come) * Mails sent have the author name as From (but gerrit mail address)? * Empty mails like "+2" not sent to the Mailinglist? * Subject changed? [PATCH] and omit branch name? Or omit project name? Other proposals? Move it to a new mailinglist and leave OpenBSC as low-volume mailinglist? comments? feedback? ideas? holger [1] https://gerrit-review.googlesource.com/Documentation/user-notify.html#notif…

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