problem with scheduling

[Doaa Terri]

Hi all, 

I wanted to change the contention window of a specific node at specified time (ie: t=10s) , I tried the method mentioned here to change the value https://groups.google.com/d/msg/ns-3-users/TZ6ZftgIkvU/T_vSSIV6sIIJ

Then I try to wrap it in a method that I can schedule at t=10. However, what I have tried did not work, since I have checked that the cw attribute has not been changed from the config file. However, when I tried to do it without the scheduling, it works (the value has been changed). So it seems that the problem from the way I scheduled the method. any help please? 

void chaan( Ptr<Node> node, uint32_t minCw, uint32_t maxCw )

{

///// changing contention window

//uint32_t minCw = 1;

//uint32_t maxCw = minCw;

 //Ptr<Node> node = wifiStaNodes.Get(0);

 //Ptr<Node> node = wifiStaNodes.Get(0);

Ptr<NetDevice> dev = node->GetDevice(0);

Ptr<WifiNetDevice> wifi_dev = DynamicCast<WifiNetDevice>(dev);

Ptr<WifiMac> mac = wifi_dev->GetMac();

        PointerValue ptr;

mac->GetAttribute("DcaTxop", ptr);

        Ptr<DcaTxop> dca = ptr.Get<DcaTxop>();

dca->SetMinCw(minCw);

dca->SetMaxCw(maxCw);

//dca->SetAifsn(2);

Ptr<EdcaTxopN> edca;

mac->GetAttribute("VO_EdcaTxopN", ptr);

edca = ptr.Get<EdcaTxopN>();

edca->SetMinCw(minCw);

edca->SetMaxCw(maxCw);

//edca->SetAifsn(2);

mac->GetAttribute("VI_EdcaTxopN", ptr);

edca = ptr.Get<EdcaTxopN>();

edca->SetMinCw(minCw);

edca->SetMaxCw(maxCw);

//edca->SetAifsn(2);

mac->GetAttribute("BE_EdcaTxopN", ptr);

edca = ptr.Get<EdcaTxopN>();

edca->SetMinCw(minCw);

edca->SetMaxCw(maxCw);

//edca->SetAifsn(2);

mac->GetAttribute("BK_EdcaTxopN", ptr);

edca = ptr.Get<EdcaTxopN>();

edca->SetMinCw(minCw);

edca->SetMaxCw(maxCw);

//edca->SetAifsn(2)

Simulator::Schedule(Seconds(1.0), &chaan, node, minCw, maxCw); 

}

Simulator::Schedule(Seconds(10.0), &chaan, wifiStaNodes.Get(0), 2,2); 

[Konstantinos]

Two questions:

a) Which config file you checked (and when) to see that the CW has not been changed? 

b) Why do you need to schedule the change every second?

Regards,

K.

[Doaa Terri]

Hi Konstantinos!

Thank you for your reply!

a) I used config store (with save mode).  

b) I put it to have the schedualing

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[Konstantinos]

a) I am not 100% sure since I have not used it, but the config store will take only the initial values. It will not see the change in the CW at t=10s.

b) I do not understand. You call the same function every second without actually changing anything. That's just redundant. I mean, you only need to schedule it once at t=10s. No need to call Simulator::Schedule again within the function. 

You can easily verify that the CW has changed by enabling the logs and checking if the corresponding methods are called.

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