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
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Li,
Just to make sure - did you check that OpenBTS works with a usual phone?
On Aug 16, 2011 1:38 PM, "josephli" josephli1029@hotmail.com wrote:
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
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Of course, any phone with available SIM card can camp on OpenBTS. The location update is sane for them. The difficulty only occurs when communicating between osmocombb based phone and OpenBTS
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Of course, any phone with available SIM card can camp on OpenBTS. The location update is sane for them. The difficulty only occurs when communicating between osmocombb based phone and OpenBTS
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I allready have the same setup and my osmocom (C123, sylvain branche) phone works without any problems with my openBTS (USRP1, v2.6.0).
Max
On 08/16/2011 11:32 AM, josephli [via baseband-devel] wrote:
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
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I just got my setup working a few days ago. One issue for me was that asterisk needed to be informed about the IMSI; if asterisk rejects a login of user IMSI###########, OpenBTS will send a location update reject. You might try checking your asterisk logs...
On Wed, Aug 17, 2011 at 11:41 AM, markus.manninger < markus.manninger@student.tugraz.at> wrote:
I allready have the same setup and my osmocom (C123, sylvain branche) phone works without any problems with my openBTS (USRP1, v2.6.0).
Max
On 08/16/2011 11:32 AM, josephli [via baseband-devel] wrote:
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
If you reply to this email, your message will be added to the discussion below:
http://baseband-devel.722152.n3.nabble.com/interact-osmocombb-with-OpenBTS-t...
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--
Markus Manninger, Ing
Student of Telematics Graz University of Technology Austria
View this message in context: Re: interact osmocombb with OpenBTShttp://baseband-devel.722152.n3.nabble.com/interact-osmocombb-with-OpenBTS-tp3258156p3262554.html
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