https://osmocom.org/https://osmocom.org/favicon.ico?16647414092018-05-04T23:50:36ZOpen Source Mobile CommunicationsOsmoBTS - Bug #3238: ipacc style dyn TS become unusable after first voice callhttps://osmocom.org/issues/3238?journal_id=91672018-05-04T23:50:36Zneelsnhofmeyr@sysmocom.de
<ul></ul><p>I should mention that testing was done with patches not yet merged to master,<br />osmo-bts Ic06c8f0fe82ae8a06afa5defd93a685010687965 I654b963815b32fcbce050c2e15f3190c97bc259f<br />osmo-bsc Icf6e25ff068e8a2600562d52726ead65e864ec02 Iedb4fb63bf1959d5f1d2c6edb6a7f5097ff16bd7 Id7d9dd06451722eb328db77bb586826c954bd85c and various others</p>
<p>see on branches neels/dyn_ts_fix</p> OsmoBTS - Bug #3238: ipacc style dyn TS become unusable after first voice callhttps://osmocom.org/issues/3238?journal_id=91682018-05-05T00:28:13Zneelsnhofmeyr@sysmocom.de
<ul><li><strong>File</strong> <a href="/attachments/3108">verbose_log.pcapng</a> <a class="icon-only icon-download" title="Download" href="/attachments/download/3108/verbose_log.pcapng">verbose_log.pcapng</a> added</li></ul><p>another pcap with more gsmtap_log from BTS and PCU, this time starting from just before one voice call is made, and after the call showing the "START Immedate Assignment Uplink (AGCH)" which seem to fail with T3169 timing out. Haven't yet spotted the difference to operation with TCH/F_TCH/H_PDCH.</p> OsmoBTS - Bug #3238: ipacc style dyn TS become unusable after first voice callhttps://osmocom.org/issues/3238?journal_id=91692018-05-05T00:35:40Zneelsnhofmeyr@sysmocom.de
<ul><li><strong>File</strong> <a href="/attachments/3109">verbose_log_fine_with_tch_f_tch_h_pdch.pcapng</a> <a class="icon-only icon-download" title="Download" href="/attachments/download/3109/verbose_log_fine_with_tch_f_tch_h_pdch.pcapng">verbose_log_fine_with_tch_f_tch_h_pdch.pcapng</a> added</li></ul><p>to have a chance to spot the difference, here another pcap with the working TCH/F_TCH/H_PDCH config.</p> OsmoBTS - Bug #3238: ipacc style dyn TS become unusable after first voice callhttps://osmocom.org/issues/3238?journal_id=91712018-05-05T17:17:30Zneelsnhofmeyr@sysmocom.de
<ul><li><strong>% Done</strong> changed from <i>0</i> to <i>60</i></li></ul><p>The reason why the PDTCH lchan did not receive any more UL data was<br /><pre>
5169 20.010225965 May 5, 2018 02:21:55.681068746 CEST 192.168.0.125 192.168.0.6 GSMTAP OsmoBTS oml.c 1424 (bts=0,trx=0,ts=3,ss=0) SET_CIPHERING (ALG=1 RxUL)
</pre></p>
<p>I routinely use ciphering in my CS network, something I haven't always done.<br />When switching to TCH/F, the BSC sets the lchan's ciphering parameters.<br />When switching back to PDCH with the ip.access style PDCH act, <strong>these remain set</strong>, and the BTS would enable ciphering.</p>
<p>With Osmocom style dynamic timeslots, we use a proper Chan Activ, which overwrites various stale state, including ciphering.<br />Hence after activating PDCH, the ciphering setting is cleared for Osmocom style dyn TS.</p>
<p>I will submit a patch to properly clear lchan attributes upon PDCH Act / Deact.<br />Probably, TCH/F_PDCH have always shown this behavior from the start, just no-one tested it with ciphering enabled :/</p> OsmoBTS - Bug #3238: ipacc style dyn TS become unusable after first voice callhttps://osmocom.org/issues/3238?journal_id=91722018-05-05T17:17:40Zneelsnhofmeyr@sysmocom.de
<ul><li><strong>Status</strong> changed from <i>New</i> to <i>In Progress</i></li><li><strong>Assignee</strong> set to <i>neels</i></li></ul> OsmoBTS - Bug #3238: ipacc style dyn TS become unusable after first voice callhttps://osmocom.org/issues/3238?journal_id=91762018-05-05T18:39:01Zneelsnhofmeyr@sysmocom.de
<ul><li><strong>% Done</strong> changed from <i>60</i> to <i>90</i></li></ul><p><a class="external" href="https://gerrit.osmocom.org/8038">https://gerrit.osmocom.org/8038</a></p> OsmoBTS - Bug #3238: ipacc style dyn TS become unusable after first voice callhttps://osmocom.org/issues/3238?journal_id=103262018-07-16T14:28:43Zneelsnhofmeyr@sysmocom.de
<ul><li><strong>Status</strong> changed from <i>In Progress</i> to <i>Resolved</i></li><li><strong>% Done</strong> changed from <i>90</i> to <i>100</i></li></ul><p>merged months ago.</p>