Hi,
I have an ipaccess nanobts model 165AU. I have followed the instructions for GPRS on the OpenBSC with a fresh install of Ubuntu 11.10:
http://openbsc.osmocom.org/trac/wiki/OpenBSC_GPRS
By adding the IMSIs for two GPRS capable handsets to the database and assigning extensions, the phones will attach and I can make calls between the handsets.
However, there seems to be no functionality related to GPRS. A couple of of different iPhones in GPRS field test mode won't pick up GPRS-related parameters in "filed test mode", such as they won't see different values I try for T3192 timer or DRC Timer Max. Note that I see changes I try for these parameters (T3192 and DRC Timer Max) sent to the nanobts from the wireshark packet captures. These same iPhones can make phone calls through the nanoBTS/OpenBSC.
Probably, the most significant underlying issue is that I don't see the SGSN IP address ever sent to the nanoBTS anywhere in the Wireshark packet capture. It's clearly set in my configuration line "gprs nsvc 0 remote ip 192.168.XXX.YYY", and again I'm using an exact copy of the instructions linked above. So, GPRS clearly won't work without the nanoBTS "knowing" the SGSN. I do see the link between SGSN and GGSN, and the SGSN/GGSN both "up", but no traffic of course between the nanoBTS and SGSN.
Note that I also did some searching and I saw one posting where the configuration line "gprs mode gprs" should be "gprs mode egprs", but that didn't make any difference. Does anyone have suggestions of what might be wrong or what I should look at?
Thanks, John
Hi John,
On Sat, Apr 21, 2012 at 12:28:53PM -0500, John wrote:
Note that I also did some searching and I saw one posting where the configuration line "gprs mode gprs" should be "gprs mode egprs", but that didn't make any difference. Does anyone have suggestions of what might be wrong or what I should look at?
I would be helpful if you could make available a pcap file of the communication between BTS and OpenBSC from the point where the OML tcp connection is established up to the point whre you see the RSL link coming up.
Hi,
OK, the SGSN is running and listening/communicating on port 23000 as specified in the config files. I was confused because (1) I couldn't find the IP address passed to the BTS on the Wireshark packet captures (maybe the IP is sent as binary or not regular text), and (2), it now seems clear the iPhone 3GS won't transmit/support GPRS even though it shows some GPRS data in the GPRS field test modes. Thus, with the iPhone 3GS, there was no BTS->SGSN traffic to view (even though it has a GPRS test mode).
We are now testing with a GPRS capable phone, the LG GR500. We can see some initial GPRS data, but nothing more than the following. The messages represent what is shown upon power up of the phone, and no following GPRS messages are sent by the phone when trying to access IP:
Here is BTS/SGSN startup:
<0011> gprs_ns.c:169 NSVCI=65534 Creating NS-VC
<0011> gprs_ns.c:169 NSVCI=65535 Creating NS-VC
<0011> gprs_ns.c:804 Creating NS-VC for BSS at 192.168.253.10:23000
<0011> gprs_ns.c:677 NSEI=65535 Rx NS RESET (NSVCI=0, cause=O&M intervention)
<0011> gprs_ns.c:536 NSEI=101 Tx NS RESET ACK (NSVCI=101)
<0011> gprs_ns.c:863 NSEI=101 Rx NS UNBLOCK
<0012> gprs_bssgp.c:247 BSSGP BVCI=0 Rx RESET cause=Transmission capacity modified
<0012> gprs_bssgp.c:247 BSSGP BVCI=2 Rx RESET cause=O&M intervention
<0012> gprs_bssgp.c:270 Cell 1-1-1-0 CI 0 on BVCI 2
<0012> gprs_bssgp.c:323 BSSGP BVCI=2 Rx BVC-UNBLOCK
<0012> gprs_bssgp.c:463 BSSGP BVCI=2 Rx Flow Control BVC
Here is the phone powering up:
<0012> gprs_bssgp.c:347 BSSGP TLLI=0x78fd6033 Rx UPLINK-UNITDATA
<0013> gprs_llc.c:478 LLC SAPI=1 C FCS=0x35b15fCMD=UI DATA
<0013> gprs_llc.c:742 LLC RX: unknown TLLI 0x78fd6033, creating LLME on the fly
2nd try:
<0012> gprs_bssgp.c:347 BSSGP TLLI=0x7d3b6971 Rx UPLINK-UNITDATA
<0013> gprs_llc.c:478 LLC SAPI=1 C FCS=0x35b15fCMD=UI DATA
<0013> gprs_llc.c:742 LLC RX: unknown TLLI 0x7d3b6971, creating LLME on the fly
I saw a note on the message board from about a year ago about handling the unknown TLLI with a patch, but the code for gprs_llc.c has been updated quite a bit since then.
We will try to look into it more and report back any findings, but any pointers would be appreciated.
John
On Mon, Apr 23, 2012 at 2:22 PM, Harald Welte laforge@gnumonks.org wrote:
Hi John,
On Sat, Apr 21, 2012 at 12:28:53PM -0500, John wrote:
Note that I also did some searching and I saw one posting where the configuration line "gprs mode gprs" should be "gprs mode egprs", but that didn't make any difference. Does anyone have suggestions of what might
be
wrong or what I should look at?
I would be helpful if you could make available a pcap file of the communication between BTS and OpenBSC from the point where the OML tcp connection is established up to the point whre you see the RSL link coming up.
--
- Harald Welte laforge@gnumonks.org
============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)
Hi John,
John wrote:
On Mon, Apr 23, 2012 at 2:22 PM, Harald Welte laforge@gnumonks.org wrote:
I would be helpful if you could make available a pcap file of the communication between BTS and OpenBSC from the point where the OML tcp connection is established up to the point whre you see the RSL link coming up.
Here is BTS/SGSN startup:
<0011> gprs_ns.c:169 NSVCI=65534 Creating NS-VC
Please send the pcap file as requested. It includes significant detail which is not shown in console messages. You can use tcpdump to create the file from the command line, or even wireshark.
//Peter
I have come across a similar problem with a 178U. Attached is the pcap file. .190 is BSC/NITB, .188 is sgsn, .195 is BTS.
Chris Rankine
On Mon, Apr 23, 2012 at 11:13 PM, Peter Stuge peter@stuge.se wrote:
Hi John,
John wrote:
On Mon, Apr 23, 2012 at 2:22 PM, Harald Welte laforge@gnumonks.org
wrote:
I would be helpful if you could make available a pcap file of the communication between BTS and OpenBSC from the point where the OML tcp connection is established up to the point whre you see the RSL link coming up.
Here is BTS/SGSN startup:
<0011> gprs_ns.c:169 NSVCI=65534 Creating NS-VC
Please send the pcap file as requested. It includes significant detail which is not shown in console messages. You can use tcpdump to create the file from the command line, or even wireshark.
//Peter
-
Chris Rankine -
Harald Welte -
John -
Peter Stuge