Hi,
I'm implementing handover for OpenBTS project: http://wush.net/trac/rangepublic/wiki/Handover Some handsets perform handover properly, while the others (such as Nokia) do not appear at the target channel with HandoverAccess.
Handover Command contains the minimal set of parameters that looks reasonable: -- cellDescription -- channelDescription -- handoverReference -- powerCommand - tried various levels
I'll appreciate real-life traces of handover, non-sync case. As far as I know, this one is used for ipAccess.. Handover Command fields are particularly interesting.
Thank you, Dmitri
Dimitri, we have a working OpenBSC/nanoBTS installation at the hackerspace. If you find out how to issue a handover command in OpenBSC, you could try by yourself.
Sent from my Android device.
-- Regards, Alexander Chemeris CEO, Fairwaves LLC http://fairwaves.ru 01.11.2012 11:02 пользователь "Dmitri Soloviev" dmisol@mail.ru написал:
Hi,
I'm implementing handover for OpenBTS project: http://wush.net/trac/rangepublic/wiki/Handover Some handsets perform handover properly, while the others (such as Nokia) do not appear at the target channel with HandoverAccess.
Handover Command contains the minimal set of parameters that looks reasonable: -- cellDescription -- channelDescription -- handoverReference -- powerCommand - tried various levels
I'll appreciate real-life traces of handover, non-sync case. As far as I know, this one is used for ipAccess.. Handover Command fields are particularly interesting.
Thank you, Dmitri
Hi Alexander and Dmitri,
On Thu, Nov 01, 2012 at 11:33:28AM +0400, Alexander Chemeris wrote:
Dimitri, we have a working OpenBSC/nanoBTS installation at the hackerspace. If you find out how to issue a handover command in OpenBSC, you could try by yourself.
You cannot issue a handover command manually in OpenBSC. The way how we test handover is to use two BTSs connected to one OsmoNITB, and use rotary/adjustable attenuators in the Tx path to make one BTS signal weaker than the other BTS, at which point the handover algorithm will kick in and perform the hand-over.
The DMEAS and the DHO debug logging might be useful to monitor what is happening while you're doing that.
Regards, Harald
Thank you Harald.
I discovered that there is a single alive nanoBTS in the hackerspace :( But we also discovered that you have a perfect OpenBSC code that can be studied :)
Regards, Dmitri
Thu, 1 Nov 2012 19:22:21 +0100 от Harald Welte laforge@gnumonks.org:
Hi Alexander and Dmitri,
On Thu, Nov 01, 2012 at 11:33:28AM +0400, Alexander Chemeris wrote:
Dimitri, we have a working OpenBSC/nanoBTS installation at the hackerspace.
If you find out how to issue a handover command in OpenBSC, you could try
by yourself.
You cannot issue a handover command manually in OpenBSC. The way how we
test handover is to use two BTSs connected to one OsmoNITB, and use
rotary/adjustable attenuators in the Tx path to make one BTS signal
weaker than the other BTS, at which point the handover algorithm will
kick in and perform the hand-over.
The DMEAS and the DHO debug logging might be useful to monitor what is
happening while you're doing that.
Regards,
Harald
Hi Harald,
we are using exactly the same Handover Command. Right now I have no clue to Nokia handsets behavior during handover. So, I'm waiting for the second umTRX to start playing with handover again.
Thank you for your letter.
Regards, Dmitri
Thu, 1 Nov 2012 19:22:21 +0100 от Harald Welte laforge@gnumonks.org:
Hi Alexander and Dmitri,
On Thu, Nov 01, 2012 at 11:33:28AM +0400, Alexander Chemeris wrote:
Dimitri, we have a working OpenBSC/nanoBTS installation at the hackerspace.
If you find out how to issue a handover command in OpenBSC, you could try
by yourself.
You cannot issue a handover command manually in OpenBSC. The way how we
test handover is to use two BTSs connected to one OsmoNITB, and use
rotary/adjustable attenuators in the Tx path to make one BTS signal
weaker than the other BTS, at which point the handover algorithm will
kick in and perform the hand-over.
The DMEAS and the DHO debug logging might be useful to monitor what is
happening while you're doing that.
Regards,
Harald
Hi Harald,
On Thu, Nov 1, 2012 at 2:22 PM, Harald Welte laforge@gnumonks.org wrote:
On Thu, Nov 01, 2012 at 11:33:28AM +0400, Alexander Chemeris wrote:
Dimitri, we have a working OpenBSC/nanoBTS installation at the hackerspace. If you find out how to issue a handover command in OpenBSC, you could try by yourself.
You cannot issue a handover command manually in OpenBSC. The way how we test handover is to use two BTSs connected to one OsmoNITB, and use rotary/adjustable attenuators in the Tx path to make one BTS signal weaker than the other BTS, at which point the handover algorithm will kick in and perform the hand-over.
If this is done inside of the OpenBSC, it should be easy to hack a VTY command to force handover. It may be a useful command as well, if you want to do load balancing of your network. Am I missing something?
The DMEAS and the DHO debug logging might be useful to monitor what is happening while you're doing that.
Thanks.
-- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru
-
Alexander Chemeris -
Dmitri Soloviev -
Harald Welte