ns-3-lbt (laa-wifi-coexistance), Not clear which ns simulater must be used.

[George]

Hello! Sorry if this question has been answered before, I`ve tried to look for a certain answer but coudln`t find.

I am tying to run the LAA-WiFi coexistence scenario in order to learn and design my own NRU-WiFi coexistence scenario.

Is there a guide on how to get this repository working please?

I have tried the following website:

https://www.nsnam.org/wiki/LAA-WiFi-Coexistence
But without any success. I can not run any code, since the ./waf comes with a big list of errors.

Thank you!

Kind regards,

George

[George]

I have also tried to use :

 https://bitbucket.org/ns3lteu/ns-3-dev-lbt/src/master/.

But I get a missing file which I cannot find anywhere in the repositories:

In file included from ../src/lte-wifi-coexistence/model/lbt-access-manager.cc:24:
../src/lte-wifi-coexistence/model/lbt-access-manager.h:36:10: fatal error: ns3/lte-channel-access-manager.h: No such file or directory
   36 | #include "ns3/lte-channel-access-manager.h"
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.

In file included from ../src/lte-wifi-coexistence/model/duty-cycle-access-manager.cc:22:
../src/lte-wifi-coexistence/model/duty-cycle-access-manager.h:25:10: fatal error: ns3/lte-channel-access-manager.h: No such file or directory
   25 | #include "ns3/lte-channel-access-manager.h"
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.

In file included from ../src/lte-wifi-coexistence/model/basic-lbt-access-manager.cc:22:
../src/lte-wifi-coexistence/model/basic-lbt-access-manager.h:28:10: fatal error: ns3/lte-channel-access-manager.h: No such file or directory
   28 | #include "ns3/lte-channel-access-manager.h"

How should I proceed to fix this error and run the laa-wifi simulation? Thank you very much!

[Tom Henderson]

For old ns-3 releases, they can often be built on newer compilers if the
-Werror flag (on by default) is disabled. See this post:

https://www.nsnam.org/wiki/HOWTO_build_old_versions_of_ns-3_on_newer_compilers

For the old ns-3-lbt code that you found on the LAA wiki page, try this:

hg clone https://code.nsnam.org/laa/ns-3-lbt
cd ns-3-lbt
CXXFLAGS="-Wall" ./waf configure --enable-examples --enable-tests
./waf build

(Note: you must have Python2 installed for the above to work)

For the more recently maintained laa code on Bitbucket (note: this has
not been maintained in 2 years and still does not pass all tests), I
just committed a patch to fix a missing header file, but was then able
to build on Ubuntu 20.04.

https://bitbucket.org/ns3lteu/ns-3-dev-lbt/wiki/Home

Use the 'laa-wifi-coexistence-rebased' branch.

Please note that the above codebases are related to LTE LAA. For NR
unlicensed, see the CTTC code:

https://5g-lena.cttc.es/blog/10/

Hope this helps.

- Tom

[Biljana Bojović]

Hi,

there is also an old version of ns-3 with LAA (LAA code is the one that Tom shared) and additionally, it has implemented CSAT LTE-U, and an example that supports both: https://bitbucket.org/cttc-lena/ns-3-lena-dev-lte-u/src/master/. This is my personal repo, on which I was working during my PhD thesis, and both models and findings are explained in this paper: https://ieeexplore.ieee.org/document/8752357.

Kind regards,

Biljana

[Mohammadreza Fasihi]

Hello Tom,

I have a problem running the "cttc-coexistence-indoor-scenario" and "cttc-nr-wigig-interference" examples. Both files need "wifi-80211ad-nist-module" that is not available within the src. However, the example "cttc-nr-wifi-interference" works fine. 

Could you help me with that?

Best,

- Reza

[Tom Henderson]

On 11/19/22 10:35, Mohammadreza Fasihi wrote:
> Hello Tom,
> I have a problem running the "cttc-coexistence-indoor-scenario" and
> "cttc-nr-wigig-interference" examples. Both files need
> "wifi-80211ad-nist-module" that is not available within the src.
> However, the example "cttc-nr-wifi-interference" works fine.
>
> Could you help me with that?
>

I cannot (I don't know where the nist module is or whether it is
available publicly); perhaps someone else knows about it?

You might also try the 5g-lena-users list because it relates to the CTTC
code.

- Tom

[Uzzam Javed]

Hello all,

I am new to ns3 and have started to use Laa-wifi-coexistence module for my research. I have started with the file ‘laa-wifi-simple.cc’ and the corresponding ‘laa-wifi-coexistence-helper.cc’ files. To understand the module I started to print the values of variables to understand the flow of code and also so that I could change those values for my simulation setup. I am using the code available on 'https://bitbucket.org/ns3lteu/ns-3-dev-lbt/branch/laa-wifi-coexistence-rebased'.

 

I want to assign different transmit power values to both the single LTE eNB and WiFi AP. I understood the these parameters are being set in ‘laa-wifi-simple.cc’ file through the struct PhyParams and being then forwarded to ‘laa-wifi-coexistence-helper.cc’ to assigned to WiFi node through the class SpectrumWifiPhyHelper.

 

I am not able to understand where is transmit power of LTE eNB is set. I studied the documentation and found a variable ‘TxPower’ for LteEnbPhy class. Based on this I made the addition of following lines to the code of ‘laa-wifi-coexistence-helper.cc’ file but it is giving the error attached.

 

Ptr <LteEnbPhy> enbPhy =lteEnbNetDevice -> Getphy ();

Ptr <LteEnbPhy> enbPhy =SetAttribute (“TxPower”, DoubleValue(30.0));

[Tom Henderson]

The error is in the below statement:

>
> Ptr <LteEnbPhy> enbPhy =SetAttribute (“TxPower”, DoubleValue(30.0));
>
>

You need to call SetAttribute method on the pointer:

enbPhy->SetAttribute("TxPower", DoubleValue(30.0));

> On Sunday, November 20, 2022 at 9:15:58 AM UTC+11 Tom Henderson wrote:
>
> On 11/19/22 10:35, Mohammadreza Fasihi wrote:
> > Hello Tom,
> > I have a problem running the "cttc-coexistence-indoor-scenario" and
> > "cttc-nr-wigig-interference" examples. Both files need
> > "wifi-80211ad-nist-module" that is not available within the src.
> > However, the example "cttc-nr-wifi-interference" works fine.
> >
> > Could you help me with that?
> >
>
> I cannot (I don't know where the nist module is or whether it is
> available publicly); perhaps someone else knows about it?
>
> You might also try the 5g-lena-users list because it relates to the
> CTTC
> code.
>
> - Tom
>

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[Uzzam Javed]

Thank you for the reply Tom. After setting the attribute I am trying to retrieve the value set  using following command but it is giving the error attached.

PointerValue tmp;

tmp-> GetAttribute ("TxPower"); 

[Tom Henderson]

You should not call GetAttribute method on the PointerValue. Please
read the following to understand how this works:

https://www.nsnam.org/docs/manual/html/attributes.html#changing-values

> https://groups.google.com/d/msgid/ns-3-users/3853cc5d-51d9-454a-a411-563fe5e5750bn%40googlegroups.com <https://groups.google.com/d/msgid/ns-3-users/3853cc5d-51d9-454a-a411-563fe5e5750bn%40googlegroups.com> <https://groups.google.com/d/msgid/ns-3-users/3853cc5d-51d9-454a-a411-563fe5e5750bn%40googlegroups.com?utm_medium=email&utm_source=footer <https://groups.google.com/d/msgid/ns-3-users/3853cc5d-51d9-454a-a411-563fe5e5750bn%40googlegroups.com?utm_medium=email&utm_source=footer>>.

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[Uzzam Javed]

As per my understanding from the documentation the code should be as follows but it is giving the attached error:

PointerValue tmp;

enbPhy-> GetAttribute ("TxPower",tmp;)

 

Secondly NS_LOG_INFO command is used for printing output on screen but when I use it to print any statement, it is not showing any output on terminal.