ns3-ai simulation stuck in between.

[Kaushika Rathod]

Greetings ns-3-users and developers!

Hope you all are doing well.

I am currently working on a code on ns3-ai. The python side implements DQN to adjust CCA threshold and TPC. I modified the ns3-ai multi-BSS example.

The issue I am facing is that the simulation is stuck in between. The simulation is running for 4 iterations, and after that, the simulation is not proceeding with no visible errors. It is stuck.

Maybe the communication between python and ns3 is broke or it is a deadlock. But I don't know how to identify the exact issue and how to fix this.

I would really appreciate if anyone helps me out in this. If anyone has/is facing similar issues or know the solution, please let me know.

Sincerely, 

Kaushika.

[압둘하미드이드리스]

Send the code snippet for understanding.

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[Kaushika Rathod]

I am trying to share the code block and file, but it is showing " Message has been deleted".

[Kent Huns]

Me too. I sent you the 3rd & 4th message in this thread, but spam filter worked.

[Kent Huns]

Is it OK now? ns3-ai(python) can't catch & display the error message from C++. 

I don't know any effective solution, but the 1st step of debug is to complete C++ only simulation.

The expansion with ns3-ai is 2nd step.

[Kaushika Rathod]

Thank you for sharing this.

I did try simulating just C++ part, without any interface with python, and there were no errors, the simulation was completed.

Then I integrated with python and it is getting stuck. 

[압둘하미드이드리스]

I will check and let you know

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[Kaushika Rathod]

I am trying to share code snippets and file, but the message is getting deleted.

What should I do?

[Kent Huns]

I have no idea what caused this, but all the messages deleted as spam in this thread seem to be replies to him/her?

Anyway, I don't need your code because the content might be too complex for outsiders(including me) to solve this problem.

Please consider the risk for your research or patent, and try again if you really need to.

Thanks

[Gabriel Ferreira]

Google spam filtering is pretty bad.
It also deletes moderators messages, and once even took down the whole ns-3-users group...
Brute forcing is a bad idea. They may lock your account.
I suggest chatting via https://ns-3.zulipchat.com/

[Kaushika Rathod]

Thank you everyone for your responses. 

The issue is now resolved.

There was a synchronization mismatch between ns3 and python side. Like, python side was waiting to send some action, while ns3 side was waiting to send environment state. Due to this, there was a deadlock in memory and both sides were blocked.

To resolve this issue, make sure if python calls for "PySendBegin" then ns3 should be ready with "CppRecvBegin", and vice-versa.

Every SendBegin() on one side must match a corresponding RecvBegin() on the other side, followed by semaphore lock release.

Best,

Kaushika

[압둘하미드이드리스]

Subject: Help with V2X Simulation Setup Including Vehicles, RSU, Base Stations, and Core Network

Hello ns-3 community,

I am working on simulating a V2X communication scenario involving

• 3 vehicles (Vehicle A, B, C)

• 1 RSU (Roadside Unit)

• 2 Base Stations

• Core Network with 3 servers

The communication types I want to simulate are:

• V2V (PC5 interface)

• V2I (PC5 interface)

• V2N (Uu interface)

• V2V Relay (Uu interface)

I would appreciate any guidance, example scripts, or pointers on:

• Modeling such a scenario in ns-3 (especially integrating LTE/5G modules for V2N and PC5 for V2V/V2I)

• Setting up mobility for vehicles (I’m considering SUMO integration)

• Simulating the relay communication (dashed arrow links)

• Best practices or existing example projects related to C-V2X

Thank you very much for your support!

Best regards,

Idris 

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