[Ns-bugs] [Bug 1073] New: Changing base station position in wimax-multicast has no effect

[code@nsnam.ece.gatech.edu]

http://www.nsnam.org/bugzilla/show_bug.cgi?id=1073

           Summary: Changing base station position in wimax-multicast has
                    no effect
           Product: ns-3
           Version: ns-3.10
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: minor
          Priority: P5
         Component: examples
        AssignedTo: ns-bugs at isi.edu
        ReportedBy: sk.anirudh at gmail.com
   Estimated Hours: 0.0


Hi

I was trying out the wimax-multicast program from the examples/wimax directory
and changing the position of the base station seems to have no effect. I later
figured this was because a line in the file wimax-multicast.cc calls
mobility.Install on both the base station node and the service station nodes.
This overrides the mobility information set at the top of the file. 
After commenting out the lines corresponding to mobility.Install the program
works fine ie it responds to changes in base station location. 
After I remove the mobility.Install lines, when I set the base station's
position to 1000000 instead of 1000, no packets are received because it is out
of range which is the correct behaviour.


I have reproduced code snippets below to help isolate the bug:

This is the part where the mobility information is set for base station:
 BSPosition = CreateObject<ConstantPositionMobilityModel> ();

  BSPosition->SetPosition (Vector (1000000, 0, 0));
  bsNodes.Get (0)->AggregateObject (BSPosition);

Here it is set for service stations:

  for (int i = 0; i < nbSS; i++)
    {
      SSPosition[i] = CreateObject<RandomWaypointMobilityModel> ();
      SSPosAllocator[i] = CreateObject<RandomRectanglePositionAllocator> ();
      SSPosAllocator[i]->SetX (UniformVariable ((i / 40) * 2000, (i / 40 + 1) *
2000));
      SSPosAllocator[i]->SetY (UniformVariable ((i / 40) * 2000, (i / 40 + 1) *
2000));
      SSPosition[i]->SetAttribute ("PositionAllocator", PointerValue
(SSPosAllocator[i]));
      SSPosition[i]->SetAttribute ("Speed", RandomVariableValue
(UniformVariable (10.3, 40.7)));
      SSPosition[i]->SetAttribute ("Pause", RandomVariableValue
(ConstantVariable (0.01)));

      ss[i] = ssDevs.Get (i)->GetObject<SubscriberStationNetDevice> ();
      ss[i]->SetModulationType (WimaxPhy::MODULATION_TYPE_QAM16_12);
      ssNodes.Get (i)->AggregateObject (SSPosition[i]);

    }


And both of these are overridden further down in the code with the lines:

 mobility.Install (bsNodes);

which overrides base station location

and
  mobility.Install (ssNodes);

 which overrides service station information.

This overriding renders the initial location information irrelevant.

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