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I'm not sure what to make of this timing difference. I'm using
sysmoBTS hw to test different osmoPCU versions (including
ssharan/egprs) and I can see pacch timeouts on all of those I've
tried. For some phones it really breaks connectivity, others seems
to be able to ignore it somehow. I do not see a pattern yet.<br>
<br>
Do you have some test setup where you try it and see if it's the
same for you?<br>
<br>
<div class="moz-cite-prefix">On 02/26/2016 04:13 PM, Saurabh Sharan
wrote:<br>
</div>
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<div>Hello Max,</div>
<div>Though I have not analyzed the missing UL poll response,
few of my observations from the pcap file attached is
mentioned below</div>
<ol style="margin:0;padding-left:36pt;">
<li>There seems to be difference in FN UL versus DL being
processed at any given time by the order of approx. 10
FNs, example given below</li>
</ol>
<ol style="margin:0;padding-left:72pt;" type="a">
<li>Packet 7174 , FN 1137361 in DL @ 15:33:22.511809393</li>
<li>Packet 7190, FN 1137361 in UL @ 15:33:22.559427972</li>
<li>From above example difference in time is 48milliseconds
or approx.. 10FN duration</li>
</ol>
<ol start="2" style="margin:0;padding-left:36pt;">
<li>For processing DL timeslots 2 to 6 at any given DL FN
time taken seems to be approx. 3milliseconds, example
given below</li>
</ol>
<ol start="4" style="margin:0;padding-left:72pt;" type="a">
<li>Packet 7174 , FN 1137361 in DL @ 15:33:22.511809393 for
TS 2</li>
<li>Packet 7178, FN 1137361 in DL @ 15:33:22.514310379 for
TS 6</li>
</ol>
<div> </div>
<div>Please let me know if these are known behavior in your
integration environment ? </div>
<div>These time variations may have an impact on the poll
response behavior from MS as well.</div>
<div> </div>
<div>Regards</div>
<div>Saurabh</div>
<div> </div>
<div>-----Original Message-----<br>
From: Max [<a moz-do-not-send="true"
href="mailto:msuraev@sysmocom.de">mailto:msuraev@sysmocom.de</a>]
<br>
Sent: Thursday, February 25, 2016 3:58 PM<br>
To: <a class="moz-txt-link-abbreviated" href="mailto:osmocom-net-gprs@lists.osmocom.org">osmocom-net-gprs@lists.osmocom.org</a>; Saurabh Sharan
<a class="moz-txt-link-rfc2396E" href="mailto:Saurabh.Sharan@radisys.com"><Saurabh.Sharan@radisys.com></a><br>
Subject: PCU scheduling and PACCH timeout question</div>
<div> </div>
<div>Hello.</div>
<div> </div>
<div>I'm trying to debug issue with current OsmoPCU master
when some basebands ignore polling requests.</div>
<div> </div>
<div>The debug output from RLCMAC layer and corresponding
.pcap files are attached.</div>
<div>The issue appears somewhere after line 112 in debug.log
The corresponding packet in pcu.pcapng is 6866</div>
<div> </div>
<div>After receiving PACKET_CONTROL_ACK from phone we're
trying to schedule polling at FN 1137123 (see packet 6869 in
pcap) and than at FN 1137127 (packet 6874) which
subsequently fails.</div>
<div>This seems suspiciously close but I have not found in the
spec yet if this is legitimate thing to do.</div>
<div> </div>
<div>There are several other occurrences like that in both log
and pcap.</div>
<div> </div>
<div>Have you experienced something like this? Do you have an
idea why only some basebands are affected while others work
fine?</div>
<div> </div>
<div>--</div>
<div>Max Suraev <<a moz-do-not-send="true"
href="mailto:msuraev@sysmocom.de">msuraev@sysmocom.de</a>>
<a moz-do-not-send="true" href="http://www.sysmocom.de/">http://www.sysmocom.de/</a>
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<div>* sysmocom - systems for mobile communications GmbH</div>
<div>* Alt-Moabit 93</div>
<div>* 10559 Berlin, Germany</div>
<div>* Sitz / Registered office: Berlin, HRB 134158 B</div>
<div>* Geschaeftsfuehrer / Managing Directors: Holger
Freyther, Harald Welte</div>
<div> </div>
<div> </div>
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<br>
<pre class="moz-signature" cols="72">--
Max Suraev <a class="moz-txt-link-rfc2396E" href="mailto:msuraev@sysmocom.de"><msuraev@sysmocom.de></a> <a class="moz-txt-link-freetext" href="http://www.sysmocom.de/">http://www.sysmocom.de/</a>
=======================================================================
* sysmocom - systems for mobile communications GmbH
* Alt-Moabit 93
* 10559 Berlin, Germany
* Sitz / Registered office: Berlin, HRB 134158 B
* Geschaeftsfuehrer / Managing Directors: Holger Freyther, Harald Welte </pre>
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