change channel loss during runtime

[Boyang Yan]

Hello All,

Good day to you.

I am using MatrixPropagationLossModel binding with the wifi channel to set the channel loss. The code below is for setting the Loss Model binding with the wifi channel.

```c++

//Create propagation loss matrix
Ptr<MatrixPropagationLossModel> lossModel = CreateObject<MatrixPropagationLossModel>();

lossModel->SetDefaultLoss(10); // set default loss to 200 dB (no link)

wifiChannel->SetPropagationLossModel(lossModel);

wifiChannel->SetPropagationDelayModel(CreateObject<ConstantSpeedPropagationDelayModel>());
wifiPhy.SetChannel(wifiChannel);

```

But, I want to change the loss during runtime.

 

I created a Schedule to make changes. However, I found below code does not work during runtime. How could I change the loss during runtime? 

```c++

    Simulator::Schedule(Seconds(2.0), &setLoss);

```

```c++

static void setLoss() {
    std::cout << "Function called at " << Simulator::Now().GetSeconds() << " seconds" << std::endl;
    // set symmetric loss 0 <-> 1 to 200 dB (no link)
    lossModel->SetLoss(UAVs.Get(0)->GetObject<MobilityModel>(),
                       UAVs.Get(1)->GetObject<MobilityModel>(),
                       200, true);
    wifiChannel->SetPropagationLossModel(lossModel);
    wifiPhy.SetChannel(wifiChannel);
    return;
}
```

Anyone know how to change channel loss during runtime?

Thanks for your helps,

Boyang

[Li, Ye]

Hi Boyang,

Here is an example I have used to change packet loss rate during the simulation for point-to-point NetDevice. Basically, you may need to find out the path to the attribute of the error model, and then schedule a function to change it at your desired time.

https://github.com/yeliqseu/rl-fec/blob/main/rlfec-stream-server-client-sim.cc

Hope it helps.

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LI, Ye

School of Information Science and Technology

Nantong University

Nantong 226019, Jiangsu Province, China

GitHub: https://github.com/yeliqseu