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2020-03-07T15:08:19Z
Open Source Mobile Communications
OsmocomBB - Bug #4439: Unnumbered frame not allowed / sending MDL-ERROR-IND cause 12
https://osmocom.org/issues/4439?journal_id=17651
2020-03-07T15:08:19Z
laforge
<ul><li><strong>Status</strong> changed from <i>New</i> to <i>In Progress</i></li><li><strong>% Done</strong> changed from <i>0</i> to <i>10</i></li></ul><p>Enabling hex-dumps of the L1SAP messages, I'm now getting:</p>
<pre>
<000c> l1ctl.c:237 BCCH on TS0 (0530/00/02) -47 dBm: 49 06 1b 00 00 62 f2 24 00 01 c9 03 05 17 47 40 e5 04 00 0b 2b 2b 2b
<0015> lapdm.c:788 fmt=Bbis UI
<0001> sysinfo.c:703 New SYSTEM INFORMATION 3 (mcc 262 mnc 42 lac 0x0001)
<0001> gsm48_rr.c:1905 Changing CCCH_MODE to 2
<000c> l1ctl.c:440 CCCH Mode Req
<000c> l1l2_interface.c:141 Sending: '10 00 00 00 02 00 00 00 '
<000c> l1ctl.c:812 CCCH MODE CONF: mode=2
<000c> l1ctl.c:237 PCH/AGCH on TS0 (0530/04/06) -47 dBm: 03 03 01 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b
<0015> lapdm.c:788 fmt=Bbis UI
<000c> l1ctl.c:237 PCH/AGCH on TS0 (0530/10/12) -47 dBm: 15 06 21 00 01 f0 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b
<0015> lapdm.c:788 fmt=Bbis UI
<000c> l1ctl.c:237 PCH/AGCH on TS0 (0530/14/16) -47 dBm: 15 06 21 00 01 f0 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b
<0015> lapdm.c:788 fmt=Bbis UI
<000c> l1ctl.c:237 UNKNOWN on TS0 (0530/04/32) -47 dBm: 2f 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b
<0015> lapdm.c:684 fmt=B
<0015> lapd_core.c:1239 Unnumbered frame not allowed. (dl=0x55b99a738ef0)
<0015> lapd_core.c:392 sending MDL-ERROR-IND cause 12 from state LAPD_STATE_IDLE (dl=0x55b99a738ef0)
<0015> lapdm.c:481 sending MDL-ERROR-IND 12
<0001> gsm48_rr.c:4977 MDL-Error (cause 12) ignoring
</pre>
<p>So the error messages appear whenever frames starting with 0x2f as the first byte appear on the downlink of TS0. Maybe CBCH related?</p>
OsmocomBB - Bug #4439: Unnumbered frame not allowed / sending MDL-ERROR-IND cause 12
https://osmocom.org/issues/4439?journal_id=17652
2020-03-07T15:26:35Z
laforge
<ul><li><strong>% Done</strong> changed from <i>10</i> to <i>90</i></li></ul><p>Fix in <a class="external" href="https://gerrit.osmocom.org/c/osmocom-bb/+/17413">https://gerrit.osmocom.org/c/osmocom-bb/+/17413</a> - as a drive-by I also fixed another related bug in <a class="external" href="https://gerrit.osmocom.org/c/osmocom-bb/+/17414">https://gerrit.osmocom.org/c/osmocom-bb/+/17414</a></p>
OsmocomBB - Bug #4439: Unnumbered frame not allowed / sending MDL-ERROR-IND cause 12
https://osmocom.org/issues/4439?journal_id=17757
2020-03-17T11:38:37Z
fixeria
<ul></ul><p>Please also see:</p>
<p><a class="external" href="https://gerrit.osmocom.org/c/osmocom-bb/+/17493">https://gerrit.osmocom.org/c/osmocom-bb/+/17493</a> layer23/l1ctl: fix: do not pass PDCH and CBCH frames to LAPDm</p>
OsmocomBB - Bug #4439: Unnumbered frame not allowed / sending MDL-ERROR-IND cause 12
https://osmocom.org/issues/4439?journal_id=18707
2020-06-13T18:07:33Z
laforge
<ul><li><strong>Subject</strong> changed from <i>Unnumbered frame not allowed / sending MDL-ERROR-IDN cause 12</i> to <i>Unnumbered frame not allowed / sending MDL-ERROR-IND cause 12</i></li></ul>
OsmocomBB - Bug #4439: Unnumbered frame not allowed / sending MDL-ERROR-IND cause 12
https://osmocom.org/issues/4439?journal_id=18708
2020-06-13T18:07:47Z
laforge
<ul><li><strong>Status</strong> changed from <i>In Progress</i> to <i>Resolved</i></li></ul><p>patches long merged</p>