Topology

[Official Mobility Introduction]

Official page, I think it helpless for a newbie in ns3.

There are two modules inside.

• PositionAllocator
  • This is for still.
• MobilityHelper
  • This is for moving.

Your scenario must exist the Node, Mobility and NetDevice.

Below is something necessary in a topology.

• Node

  Most of time I use NodeContainer to manipulate the nodes.

  • Create 30 nodes and do nothing.

    Create 30 Nodes source

    NodeContainer nodes;
    nodes.Create (30);
    

    The nodes without position assignment will be gray in pyviz.

  • Get the 5th node.

    nodes.Get (4);
    

  • Get the nodes number of NodeContainer

    nodes.GetN ();
    

  • Add another node to the NodeContainer

    Ptr<Node> another_node;
    nodes.Add (another_node);
    

• Mobility

  The space coordinate of NS3 is x, y, and z axis. Unit is meter and variable type is double.

  Most of time I use MobiliityHelper and distinct PositionAllocator to help me place the node in the right place. but not all of the node needs a specific position to perch, Like in LTE, PDN Gateway, the example code from official didn't give it a position.

  For mobility, I use position allocator and mobility helper to decide nodes where and how to move.