Generation of REM with LTE

[Bob]

I'm trying to generate the REM map with the LTE module, with something like this (right before running the simulation):

    Ptr<RadioEnvironmentMapHelper> remHelper = CreateObject<RadioEnvironmentMapHelper> ();

    remHelper->SetAttribute("StopWhenDone", BooleanValue(false));

    if( doRem == true )

    {    

        std::cout << "Generating Radio Environment Map" << '\n';

        remHelper->SetAttribute("ChannelPath", StringValue("/ChannelList/0"));

        remHelper->SetAttribute("OutputFile", StringValue("./rem.out"));

        remHelper->SetAttribute("XMin", DoubleValue(0.0));

        remHelper->SetAttribute("XMax", DoubleValue(x_distance));

        remHelper->SetAttribute("YMin", DoubleValue(0.0));

        remHelper->SetAttribute("YMax", DoubleValue(y_distance));

        remHelper->SetAttribute("Z", DoubleValue(0.0));  // to change 

        remHelper->SetAttribute("StopWhenDone", BooleanValue(true));

        remHelper->SetAttribute ("UseDataChannel", BooleanValue (true));

        remHelper->Install();

    }

but I'm getting this error:

aborted. cond="m_channel == 0", msg="object at /ChannelList/0is not of type SpectrumChannel", file=../src/lte/helper/radio-environment-map-helper.cc, line=193

terminate called without an active exception

did I forget something?

Thanks,

[Bob]

the issue is that channelpath number is not correct. If I use 1, it seems to be working. 

in general, how do I determine the correct number? Is there a macro for that?

[Zoraze Ali]

Hi Bob,

If you search on the group with the same msg you got you can find the useful post. Below is the link to that and see the comments by Nicola i think they are helpful .

https://groups.google.com/forum/#!searchin/ns-3-users/msg$3D%22object$20at$20$2FChannelList$2F0is$20not$20of$20type$20SpectrumChannel%22/ns-3-users/AO2m9wIBMxY/em5GuNs7slQJ

regards,
Zoraze

[Bob]

yes, I saw it after I post the message. 

Thank you

[Yared Zerihun]

If the reply is not considered old,

I got the type of a channel by exploiting the number of NetworkDevices attached to that channel.
specifically,

1. get any channel from the ChannelList class
2. exploit the GetNDevices() method from the channel object obtained in 1