Bug 2338

Summary:	WifiMode selected for control frames may sometimes be invalid
Product:	ns-3	Reporter:	Tom Henderson <tomh>
Component:	wifi	Assignee:	sebastien.deronne
Status:	RESOLVED FIXED
Severity:	normal	CC:	ns-bugs
Priority:	P5
Version:	pre-release
Hardware:	All
OS:	All
Attachments:	patch to fix final patch

Description Tom Henderson 2016-03-16 01:13:30 UTC

MinstrelHt model is asserting under some configurations for different channel widths and nss.  As reported by Matias, the problem is due to the txVector used on BlockAcks, where the txVector is selected not by MinstrelHt but by the WifiRemoteStationManager using the last used mode.  The last used mode for data may result in an invalid mode for control once the control channel width drops to 20 MHz.

To reproduce on debug build of changeset 12052:f8ce7407add5:

  ./waf --run "minstrel-ht-wifi-manager-example --nss=3 --standard=802.11ac"

asserts with:

Testing 802.11ac... assert failed. cond="channelWidth != 20", file=../src/wifi/model/wifi-mode.cc, line=165

Comment 1 sebastien.deronne 2016-03-19 04:29:49 UTC

Created attachment 2348 [details]
patch to fix

This patch fixes the issues.
I still need to clean it a bit for a better readability.

Comment 2 sebastien.deronne 2016-03-21 14:37:29 UTC

Created attachment 2349 [details]
final patch

Comment 3 sebastien.deronne 2016-03-21 15:54:00 UTC

fixed in changeset 12057:3b0fe1cef64f