802.11n assert failed cond="m_lastReceivedHdr.IsQosData ()"

[Tom De Schepper]

Hi all,

I have experienced a failing assert when trying to simulate an 802.11n topology with 5 or more stations.

I get the following output: 

assert failed. cond="m_lastReceivedHdr.IsQosData ()", file=../src/wifi/model/mac-low.cc, line=864

libc++abi.dylib: terminating

The topology is 1AP with 5 stations placed in a grid and from every stations there is 1MBps flow of TCP traffic going to the AP.  Note that if I chance the topology to 4 nodes or if i lower the datarate, the assert is nog triggered.

Currently, I am using the NS-3.25 release version

I created a minimal example that can recreate the error and added this example in the attachment.

I also checked out this thread, but due to the fact that I m using 802.11n instead of ac, I decided to create a new post.

Am i doing something wrong?

Thanks in advance!

Best regards,
Tom

[Nat P]

Il giorno martedì 12 aprile 2016 13:31:03 UTC+2, Tom De Schepper ha scritto:

The topology is 1AP with 5 stations placed in a grid and from every stations there is 1MBps flow of TCP traffic going to the AP.  Note that if I chance the topology to 4 nodes or if i lower the datarate, the assert is nog triggered.

I cannot help you on WiFi, but please, "1 MBps flow of TCP traffic going to AP" is a completely wrong statement. You're injecting data at 1 MBps rate into the TCP buffer, and you cannot say nothing about the rate at which this data is going out from the node.

Nat

[Tom De Schepper]

Fair enough, you are right. I will change it.

Op dinsdag 12 april 2016 15:08:10 UTC+2 schreef Nat P:

[Tommaso Pecorella]

Hi,

please check these 3 bugs (all still open):

https://www.nsnam.org/bugzilla/buglist.cgi?quicksearch=IsQosData

Your scenario might fall in one of these 3 cases. If it doesn't, contact Sébastien. Well, even if it does, as your script could be helpful.

Cheers,

T.

[Tom De Schepper]

Hi, 

Thanks for your response, I will contact Sebastien.

Best regards,

Tom

Op dinsdag 12 april 2016 18:09:03 UTC+2 schreef Tommaso Pecorella:

[liuj...@gmail.com]

Hi, Tom.

Have you solved this problem?

Now I am also facing this trouble.

在 2016年4月13日星期三 UTC+9下午5:24:02，Tom De Schepper写道：

[Tom De Schepper]

I managed to contact Sebastien, who is the developer of these modules and he made a patch file for me which can be found in the attachment. Executing this file from the ns-3.25 folder should solve the problem

Op vrijdag 12 augustus 2016 04:09:54 UTC+2 schreef liuj...@gmail.com:

[liuj...@gmail.com]

Thank you very much! I will have a try.

在 2016年8月16日星期二 UTC+9下午5:35:37，Tom De Schepper写道：

[SUBIN JOSEPH]

Hi all,

I am also facing the same problem. I have tried to apply this patch.But after adding this, I am not able to build my script.I don't know whats the actual problem.Could someone explain how can I add this patch successfully?/

Thanks in advance

Subin

[Tom Henderson]

On 09/17/2016 04:40 AM, SUBIN JOSEPH wrote:
> Hi all,
> I am also facing the same problem. I have tried to apply this patch.But
> after adding this, I am not able to build my script.I don't know whats
> the actual problem.Could someone explain how can I add this patch
> successfully?/
> Thanks in advance
> Subin

That patch is already merged to ns-3-dev, so please try running from
that code version.

- Tom

[Khairesoufi S R]

can u add the patch sir ? i also stuck at the same problem . help me pls