Add helper for uniform gw distribution

examples/leo-delay-tracing-example.cc

@@ -26,20 +26,19 @@ int main (int argc, char *argv[])
 
   CommandLine cmd;
   std::string orbitFile;
-  std::string groundFile;
   std::string traceFile;
   LeoLatLong source;
   LeoLatLong destination;
   std::string islRate;
   std::string constellation;
+  uint64_t numGws;
   Time interval;
   Time duration;
   cmd.AddValue("orbitFile", "CSV file with orbit parameters", orbitFile);
   cmd.AddValue("traceFile", "CSV file to store mobility trace in", traceFile);
-  // TODO write position allocator for long,lat
-  cmd.AddValue("groundFile", "CSV file with ground station locations", groundFile);
   cmd.AddValue("precision", "ns3::LeoCircularOrbitMobilityModel::Precision");
   cmd.AddValue("duration", "Duration of the simulation", duration);
+  cmd.AddValue("numGws", "Number of gateways", numGws);
   cmd.AddValue("source", "Traffic source", source);
   cmd.AddValue("destination", "Traffic destination", destination);
   cmd.AddValue("islRate", "Throughput of the ISL link", islRate);
@@ -60,11 +59,10 @@ int main (int argc, char *argv[])
   NodeContainer satellites = orbit.Install (orbitFile);
 
   LeoGndNodeHelper ground;
-  NodeContainer stations = ground.Install (groundFile);
+  NodeContainer stations = ground.Install (numGws);
   NodeContainer users = ground.Install (source, destination);
   stations.Add (users);
 
-  // TODO create source and sink with ConstantPosition MobilityHelper
   Ptr<Node> client = users.Get (0);
   Ptr<Node> server = users.Get (1);
 

helper/ground-node-helper.cc

@@ -5,6 +5,8 @@
 #include "ns3/log.h"
 #include "ns3/config.h"
 #include "ns3/waypoint.h"
+#include "ns3/double.h"
+#include "ns3/mobility-helper.h"
 
 #include "ground-node-helper.h"
 
@@ -55,6 +57,24 @@ LeoGndNodeHelper::Install (const std::string &file)
   return nodes;
 }
 
+NodeContainer
+LeoGndNodeHelper::Install (uint64_t numNodes)
+{
+  NodeContainer nodes;
+  for (uint64_t i = 0; i < numNodes; i++)
+    {
+      nodes.Add (m_gndNodeFactory.Create<Node> ());
+    }
+  MobilityHelper mobility;
+  mobility.SetMobilityModel ("ns3::ConstantPositionMobilityModel");
+  mobility.SetPositionAllocator ("ns3::LeoPolarPositionAllocator",
+  				 "Step", DoubleValue (360.0 * 180.0 / numNodes));
+
+  mobility.Install (nodes);
+
+  return nodes;
+}
+
 Vector3D
 LeoGndNodeHelper::GetEarthPosition (const LeoLatLong &loc)
 {

helper/ground-node-helper.h

@@ -29,11 +29,18 @@ public:
 
   /**
    *
-   * \param wpFile path to latitude longitude file
+   * \param file path to latitude longitude file
    * \returns a node container containing nodes using the specified attributes
    */
   NodeContainer Install (const std::string &file);
 
+  /**
+   *
+   * \param numNodes a number of nodes to uniformly distribute accross earth
+   * \returns a node container containing nodes using the specified attributes
+   */
+  NodeContainer Install (uint64_t numNodes);
+
   /**
    *
    * \param location1 first location