Re: "Set the propagation loss model first" error despite having defined "SetPathlossAttribute"

[Albu]

Could you please share the code? NrChannelHelper works with ObjectFactory, and if you don't set the TypeId (by calling ConfigureFactories) before setting the attributes, it will fail. I also checked your previous message, maybe you are trying to use this new channel model with the helper. In any case, I can only figure it out if you share the code (or at least some part of it)

Em quinta-feira, 8 de janeiro de 2026 às 12:34:48 UTC+1, Angèle Hager Hafaiedh escreveu:

I wanted to define a new channel model inside gsoc-nr-channel-models.cc, but i get the "Set the propagation loss model first" error, eventhough I clearly defined it as follows:

   channelHelper->SetPathlossAttribute("ShadowingEnabled", BooleanValue(false));

Why does it generate error messages?

Thank you in advance

Angèle   

[Bara Sabbah]

This is how i defined a new channel model:

( MyCustomLossModel is a model i created you can replace it with name your own model)

// check if its acustom channel model or not
if(!custom_channel){
    channelHelper->ConfigureFactories("UMi", "LOS", "ThreeGpp");
    // Disable shadowing

    channelHelper->SetPathlossAttribute("ShadowingEnabled", BooleanValue(false));
    }

    else{  

    channelHelper->ConfigurePropagationFactory(ns3::MyCustomLossModel::GetTypeId());    

    
    }