changing the contention window

[Doaa Terri]

Hi all;

I had a problem in modifying the contention window value for a specific node. 

I searched and found a solution in : https://groups.google.com/forum/#!searchin/ns-3-users/cwmin/ns-3-users/ESRL_7Uw2lo/mhGRpeu3760J 

and : https://groups.google.com/forum/#!searchin/ns-3-users/how$20to$20change$20the$20back$20off$20value$20/ns-3-users/I2dwD55_WLU/OAi4qV1wNuYJ

However I implemented it in my code but it did not work. I mean by it is not working is that the throughput of the selfish node (node with modified CW) should be higher than before But it is not changing!!

Can some one give me hints on how to solve this issue, or let me know if I miss a step. 

PS: attached is my code

Thanks in advance  

[Doaa Terri]

any one can help please? i am still did not get it!

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[Doaa Terri]

Hi all, I think I know why I am facing this problem, The value of the contention is not changing even when I change it by accessing the the cw attribute using config : 

 Config::Set("/NodeList/0/DeviceList/0/$ns3::WifiNetDevice/Mac/$ns3::RegularWifiMac/DcaTxop/CwMin", UintegerValue(2)); 

I have tried to use config store to check this attribute and found this: 

value /$ns3::NodeListPriv/NodeList/0/$ns3::Node/DeviceList/0/$ns3::WifiNetDevice/Mac/$ns3::AdhocWifiMac/DcaTxop/$ns3::DcaTxop/MinCw "31"

why the value is not changing ?

any idea please?