OpenBSC June 2009

openbsc@lists.osmocom.org

17 participants
103 discussions

Re: AW: measurement report
by Dieter Spaar 18 Jun '09

18 Jun '09

On Wed, 17 Jun 2009 17:22:12 CEST, "Dieter Spaar" <spaar(a)mirider.augusta.de> wrote: > > A quick idea without having verified it: You can try to > decrease NM_ATT_BS11_RADIO_MEAS_GRAN which is currently set > to 254 (0xFE). The unit seems to be "SACCH multiframes" which > is about 470 ms. If this attribute and its value means that a > report should only be sent about every 120 seconds, it would take > quite some time to see the report. However I am not 100% if this > attribute really has this meaning. I verified it, decreasing NM_ATT_BS11_RADIO_MEAS_GRAN to a smaller value (I used 5 which means about 2.4 seconds) will show the measurement results as expected. The default setting of 254 is just too large so that you normally won't notice them during testing. Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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AW: measurement report
by Andreas.Eversberg 18 Jun '09

18 Jun '09

>> I am not sure if you will get the measurement reports for an active >> connection by default or if they have to be turned on with a "Start >> Measurement" command over OML. > >it's part of the BTS or TRX attributes that are set from the BSC. NM_ATT_BS11_RADIO_MEAS_REP, 0x01, 0x01, measurement report is enabled in msg_6[], but no report messages during call or setup. this TRX-config seems to tell the mobile to send reports. what do i need to tell the BTS to forward the reports to BSC?

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measurement report
by Andreas.Eversberg 18 Jun '09

18 Jun '09

hi, i like to check out the measturement report feature of GSM. the A-bis protocol shows measurement report indications, but i can't see any request to turn it on. on the BCCH it is turned on, as far as i can see in the bsc_hack.c. what do i miss? (neighbor cell frequencies?) also i like to get continuous informations about timing advance. any idea on how to retrieve these informations? regards, andreas

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Re: AW: measurement report
by Dieter Spaar 17 Jun '09

17 Jun '09

Hello Andreas, On Wed, 17 Jun 2009 16:38:13 +0200, "Andreas.Eversberg" <Andreas.Eversberg(a)versatel.de> wrote: > > NM_ATT_BS11_RADIO_MEAS_REP, 0x01, 0x01, > > measurement report is enabled in msg_6[], but no report messages during > call or setup. this TRX-config seems to tell the mobile to send reports. > what do i need to tell the BTS to forward the reports to BSC? > A quick idea without having verified it: You can try to decrease NM_ATT_BS11_RADIO_MEAS_GRAN which is currently set to 254 (0xFE). The unit seems to be "SACCH multiframes" which is about 470 ms. If this attribute and its value means that a report should only be sent about every 120 seconds, it would take quite some time to see the report. However I am not 100% if this attribute really has this meaning. Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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nanoBTS Listen mode
by Nordin 17 Jun '09

17 Jun '09

Hello guys, I was reading the nanoBTS product description and found support for "Network Listen" feature to monitor and decode GSM base stations. Is that an ip.access specific protocol? If so, does anyone has the ability to revers engineer this particular function. That would be really great! I would like to scan other ARFCNs for neighbourcells and fill the information in SI 2, 3 or 4, don't remeber which one. Thank you.

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AW: fixes for mncc-harald branch
by Andreas.Eversberg 17 Jun '09

17 Jun '09

> If anyone wants to look further into this, I'm happy to record some PCAP files with some example RTP/RTCP dumps. If you want, even combined with the TCP connection to the BSC, so you have a correct timeline and know what the BSC told the BTS when, and how the BTS reacted to that. i would like to see some of this payload, but without any BSC traffic. when i see in the future, i see that a bts directly forwards rtp data to remote sip phone or media gateway or other bts. therefore it must be a standard. i think it is gsm audio coded.

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Re: measurement report
by Dieter Spaar 17 Jun '09

17 Jun '09

Hello Andreas, On Tue, 16 Jun 2009 15:35:13 +0200, "Andreas.Eversberg" <Andreas.Eversberg(a)versatel.de> wrote: > > i like to check out the measturement report feature of GSM. the A-bis > protocol shows measurement report indications, but i can't see any > request to turn it on. on the BCCH it is turned on, as far as i can see > in the bsc_hack.c. what do i miss? (neighbor cell frequencies?) You need an active connection between the BTS and the MS to get the measurement reports. The BTS will send its own results together with the data received from the MS. If the cell has neighbor cells the MS will also report their data (right now bsc_hack does not configure any neighbor cells). I am not sure if you will get the measurement reports for an active connection by default or if they have to be turned on with a "Start Measurement" command over OML. > also i like to get continuous informations about timing advance. any > idea on how to retrieve these informations? TA is included in the measurement report from the BTS. Please be aware that a value other than 0 means that you are more than about 550 meter away with the MS from the BTS so you cover a rather large area with your BTS ;-) Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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Re: measurement report
by Dieter Spaar 16 Jun '09

16 Jun '09

On Tue, 16 Jun 2009 17:22:55 CEST, "Dieter Spaar" <spaar(a)mirider.augusta.de> wrote: > > I am not sure if you will get the measurement reports for an active > connection by default or if they have to be turned on with a "Start > Measurement" command over OML. Please forget about the "Start Measurement" OML message, they have been introduced with newer versions of GSM 12.21 and are most certainly not available with the BS-11 (and probably intended for other things). Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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Re: fixes for mncc-harald branch
by Harald Welte 15 Jun '09

15 Jun '09

On Mon, Jun 15, 2009 at 08:38:55PM +0200, Andreas.Eversberg wrote: > > > yes, can you please provide a patch that adds it to gsm_mncc, rather > than gsm_mncc_number? > > here it is... thanks, applied. -- - 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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change my email
by Andreas.Eversberg 15 Jun '09

15 Jun '09

harald, could you please change my email within the source code? my email is "a ndr ea s aet ever sber g dot eu". (remove spaces) this works much better, even after versatel era :-]. regards, andreas

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OpenBSC June 2009