Use of RTS/CTS with 802.11ax, ac, n

[Filip]

Hello, I am trying to simulate hidden node using 802.11ax, ac and 802.11n but  RTS/CTS is allways used, even though the Rts/Cts threshold is set to 2200. I try set Rts/Cts value different ways but nothing help. Can anyone help me please ? 

This is how I try to set Rts/Cts value: 

and

Wireshark:

Thank you for any advice. 

Best regards

[Tom Henderson]

On 3/11/22 05:08, Filip wrote:
> Hello, I am trying to simulate hidden node using 802.11ax, ac and
> 802.11n but  RTS/CTS is allways used, even though the Rts/Cts threshold
> is set to 2200. I try set Rts/Cts value different ways but nothing help.
> Can anyone help me please ?
>

What version of ns-3 are you using; the latest release ns-3.35 or the
development version?

[Filip]

Hello Tom, thank you for reply. I use ns-3.35 version.

Best regards

Dátum: piatok 11. marca 2022, čas: 18:24:07 UTC+1, odosielateľ: Tom Henderson

[Tom Henderson]

On 3/11/22 09:27, Filip wrote:
> Hello Tom, thank you for reply. I use ns-3.35 version.

This code in the example program
examples/wireless/wifi-simple-hidden-ht-stations.cc works for me:

  if (!enableRts)
    {
      Config::SetDefault
("ns3::WifiRemoteStationManager::RtsCtsThreshold", StringValue ("999999"));
    }
  else
    {
      Config::SetDefault
("ns3::WifiRemoteStationManager::RtsCtsThreshold", StringValue ("0"));
    }

[Filip]

Hello Tom,

 Thanks for advice. Rts/Cts now work correctly, but I got same throughput and application packet drop for both case (Rts/Cts on  and off). I thought the error would be in my code, so I try  examples/wireless/wifi-simple-hidden-ht-stations.cc using 802.11ac with changed packet sending interval  and same result (same throughput with Rts/Cts on and off), when I change standard back to 802.11b or 802.11g  works fine. Could you help me what can be wrong ?

Thanks for any advice,

best regards

Dátum: piatok 11. marca 2022, čas: 19:05:07 UTC+1, odosielateľ: Tom Henderson

On 3/11/22 09:27, Filip wrote:

[Soulimane Mammar]

Hi,

Just sent you a message on https://groups.google.com/g/ns-3-users/c/7OaXo3rp3cw

[Filip]

Hello, thank you very much. 

In this topic I try simulate different scenario with hidden node. I have answered you in more detail in the topic you mentioned.

Best regards

Dátum: nedeľa 13. marca 2022, čas: 18:49:24 UTC+1, odosielateľ: souliman...@gmail.com

[Tom Henderson]

On 3/11/22 09:27, Filip wrote:

> Hello Tom, thank you for reply. I use ns-3.35 version.

Filip, I looked into this further and I think there is a problem with
hidden terminals and these higher rates; I filed a bug for our Wi-Fi
maintainers to look into it:

https://gitlab.com/nsnam/ns-3-dev/-/issues/595

- Tom

[Filip]

Hello Tom, thank you very much.

I have one more question about packet drop. I used working 802.11g on hidden node and measure received and dropped packets. I put my outputs into a graph bellow. My question is, shouldn´t be number of dropped packets when RTS/CTS is OFF equal (at least approximately) to number of received packets when RTS/CTS is ON,  to maintain the ratio ?

This is my code to capture dropped and received packets.

Output:

  

Thank you in advance for answer.

Best regards

Dátum: pondelok 14. marca 2022, čas: 17:42:21 UTC+1, odosielateľ: Tom Henderson