How to Assign different Propagation loss models to different eNB?

[Augusto Franco]

Hi,

Im creating a HetNet scenario (Macro and Small cells), and I want to simulate different propagation loss models (LogDistancePropagationLossMode) for each cell type.

128.1 + 37.6*log10(R) — for Macro, and…
140.7 + 36.7*log10(R) — for Small Cells

lteHelper->SetSpectrumChannelType ("ns3::MultiModelSpectrumChannel");
lteHelper->SetAttribute ("PathlossModel", StringValue"ns3::LogDistancePropagationLossModel"));
lteHelper->SetPathlossModelAttribute("Exponent", DoubleValue (3.76));
lteHelper->SetPathlossModelAttribute("ReferenceLoss", DoubleValue (128.1));

I don't know how to change the atributes (“Exponent” and “ReferenceLoss”) used by the small cells.

I tried to create a different path loss object…

Ptr<LogDistancePropagationLossModel> pathLoss = CreateObject<LogDistancePropagationLossModel> ();

Ptr<LteEnbNetDevice> lteSmallEnbDev = SmallenbDevs.Get (0)->GetObject<LteEnbNetDevice> ();
Ptr<LteEnbPhy> SmallenbPhy = SmalllteEnbDev->GetPhy();
SmallenbPhy->GetDownlinkSpectrumPhy()->GetChannel()->AddPropagationLossModel(pathLoss);

But I got:

assert failed. cond="m_propagationLoss == 0", file=../src/spectrum/model/multi-model-spectrum-channel.cc, line=426 terminate called without an active exception

What should I do???
How I do create the pathloss with different components for each cell type?

Best Regards


August.