How to test collisions in a wi-fi scenario

[jshn...@gmail.com]

I created ~8000 wifi nodes in a square space (with a limited trasmission range) and the simulation works in this way:

- 8000 nodes in a 8000x8000 area, with 12 m between each node 

- A node at the center send a broadcast message

- Every node that receives a broadcast message will send another broadcast message (just for the first time)

In the last thread someone said that Wi-Fi handles collisions very well. I tried using NqosWifiMacHelper and changing the WI-fi standard, but nothing changed. What can I use to make the this wireless scenario and get the collisions? Thank you.

[Tommaso Pecorella]

Please:

1) Read the posting guidelines.

2) Do your homework.

3) WifiPhyStateHelper::m_rxErrorCallback and WifiPhyStateHelper::m_rxErrorTrace - how comes you haven't found it ?

T.

[jshn...@gmail.com]

Every research on google brings me here. Will these 2 let me send messages and get collisions? I just need to disable the collision management for the wi-fi scenario.

[Tommaso Pecorella]

Have a notice of a collision yes - but for real it is a drop due to high SNR, you don't know if it's just bad luck with noise or a collision with another packet. If this seems obscure to you, please study how a wireless receiver works.

Disabling the collision management is a totally different thing. Again, please study the Wi-Fi standard to understand why.

T.