Building Complex Topology using NS3
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This document describes the topology and implementation of a wireless network simulation. It includes: 1) Defining different node types (access point, stations, point-to-point, CSMA nodes) and connecting them with various net device and channel types. 2) Configuring the PHY and MAC layers for WiFi nodes using helper classes and setting attributes. 3) Adding mobility to WiFi nodes using mobility models and allocators to set positions while moving within boundaries. 4) Installing the internet stack on nodes and assigning IP addresses. 5) Adding server and client applications to simulate network traffic and running the simulation.
![Building Topology
[Part-2]](https://image.slidesharecdn.com/4session-buildingtopology-150112224747-conversion-gate01/85/Building-Complex-Topology-using-NS3-1-320.jpg)
![NODE
● We are having four different types of nodes.
● Create Four Different NodeContainer
– Point to Point
– Station Nodes
– Access Point
– CSMA NodeContainer n1,n2;
n1.Create(3);
[...]
N2.Create(1);
n2.Add(n1.Get(0));
void Create(uint32_t n);
Add()- used to add node in a node container
Create() - used to create node/s](https://image.slidesharecdn.com/4session-buildingtopology-150112224747-conversion-gate01/85/Building-Complex-Topology-using-NS3-7-320.jpg)
![Configure WIFI NetDevice
● WifiChannel & WifiPhy abstract class
– YansWifiChannel
● We use Helper [YansWifiChannelHelper]
● Set Channel related attributes
– [channel switch delay, energy of received signal,etc]
– YansWifiPhy
● We use Helper [YansWifiPhyHelper]
● Set PHY Layer related attributes
– [propogation delay] Set CHANNEL to PHY
void SetChannel(Ptr<YansWifiChannel>)-
Class YansWifiPhy](https://image.slidesharecdn.com/4session-buildingtopology-150112224747-conversion-gate01/85/Building-Complex-Topology-using-NS3-10-320.jpg)
![Mobility
[Cartesian Position]
Source:http://en.wikipedia.org/wiki/Cartesian_coordinate_system](https://image.slidesharecdn.com/4session-buildingtopology-150112224747-conversion-gate01/85/Building-Complex-Topology-using-NS3-13-320.jpg)
![Mobility
● We use Helper Class
– MobilityHelper
● SetMobilityModel()-Set Mobility Model
● SetPositionAllocator() - Set Position Allocator
– Install the mobility on Nodes
– Mobility Model [Access Point & CSMA Nodes]
● ConstantPositionMobilityModel](https://image.slidesharecdn.com/4session-buildingtopology-150112224747-conversion-gate01/85/Building-Complex-Topology-using-NS3-17-320.jpg)
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Building Complex Topology using NS3
- 2. Topology STA-1 STA-2 STA-3 AP CSMA P2P WIFI P1 P2 C1 C2 C3 C4 CLIENT SERVER UdpEchoServerHelper UdpEchoCientHelper
- 3. RoadMap ● Writing Code ● Detail Understanding – Logging – Tracing – Attributes
- 4. Flow Chart Point To Point CSMA WIFI Station WIFI AP NODE Container Point To Point CSMA WIFI Station WIFI AP NetDe`vice Container Point To Point CSMA WIFI Station WIFI AP SetAttributes NetDevice Point To Point CSMA Attach NetDevice to PHY &CHANNEL WIFI Station WIFI AP Configure PHY & MAC WIFI Station WIFI AP Attach NetDevice to PHY &CHANNEL Point To Point CSMA WIFI Station WIFI AP Install ProtocolStack Point To Point CSMA WIFI Station WIFI AP Assign IP Address Install Application
- 5. Topology Description ● Channels & Net Device – Wireless – Point to Point – CSMA ● Node Container – Access Point Node – Station Nodes – Point to Point Nodes – CSMA Nodes ● Node P1 & P2 having two Net Device of different types
- 6. Classes ● NodeContainer ● PointToPointHelper ● CsmaHelper ● YansWifiChannelHelper ● YansWifiPhyHelper ● WifiHelper ● NetDeviceContainer ● MobilityHelper ● InternetStackHelper ● Ipv4AddressHelper ● Ipv4InterfaceContainer ● UdpEchoServerHelper ● UdpEchoClientHelper ● ApplicationContainer ` Include #include "ns3/core-module.h" #include "ns3/network-module.h" #include "ns3/csma-module.h" #include "ns3/internet-module.h" #include "ns3/point-to-point-module.h" #include "ns3/applications-module.h" #include "ns3/ipv4-global-routing-helper.h"
- 7. NODE ● We are having four different types of nodes. ● Create Four Different NodeContainer – Point to Point – Station Nodes – Access Point – CSMA NodeContainer n1,n2; n1.Create(3); [...] N2.Create(1); n2.Add(n1.Get(0)); void Create(uint32_t n); Add()- used to add node in a node container Create() - used to create node/s
- 8. NetDevice and Channel ● Three different NetDevice and Channel:- – PointToPointHelper – NetDevice & Channel – CsmaHelper – NetDevice & Channel – YansWifiChannelHelper – Channel – YansWifiPhyHelper – PHY – WifiHelper – NetDevice We use Install()method to attach NetDevice with Node It will return an object to NetDeviceContainer
- 10. Configure WIFI NetDevice ● WifiChannel & WifiPhy abstract class – YansWifiChannel ● We use Helper [YansWifiChannelHelper] ● Set Channel related attributes – [channel switch delay, energy of received signal,etc] – YansWifiPhy ● We use Helper [YansWifiPhyHelper] ● Set PHY Layer related attributes – [propogation delay] Set CHANNEL to PHY void SetChannel(Ptr<YansWifiChannel>)- Class YansWifiPhy
- 11. Configure MAC ● WifiMac abstract class – List of MAC Types ● AdhocWifiMac – Infrastructure less network ● ApWifiMac – Access point Node MAC ● StaWifiMac – Station Node MAC ● Etc. – We use Helper Class ● NqosWifiMacHelper or WifiMacHelper – Set the appropiate MAC from the list and Set Attributes ● void SetType(T,A,V....); ● T- Type of MAC ● A- Name of Attribute ● V –Value of Attribute
- 12. Mobility ● It is used to track and maintain the – Current Cartesian position – Speed of an object – Placement of Node – Setup Mobility Model
- 14. Mobility ● Assign Mobility to WIFI Nodes – List of Mobility Model ● ConstantAccelerationMobilityModel ● ConstantPositionMobilityModel ● ConstantVelocityMobilityModel ● RandomDirection2dMobilityModel ● RandomWalk2dMobilityModel ● Etc – List of Allocator Model (placement of Node) ● RandomDiscPositionAllocator ● RandomRectanglePositionAllocator ● GridPositionAllocator ● Etc.
- 15. Mobility Model ● RandomWalk2dMobilityModel – 2D random walk mobility model – Each instance moves with a speed and direction choosen at random – Nodes moves in Boundaries specified by Rectangle – Rectangle(double xMin,double xMax,double yMin,double yMax) x-axis y-axis xMin xMax yMin yMax
- 16. Allocator Model ● GridPositionAllocator – Allocate position on a rectangular 2D grid – List of Attributes ● MinX ● MinY ● DeltaX ● DeltaY ● GridWidth ● LayoutType – ROW_FIRST – COLUMN_FIRST 1 2 3 4 (MinX,MinY) DeltaX DeltaY GridWidth x-axis y-axis
- 17. Mobility ● We use Helper Class – MobilityHelper ● SetMobilityModel()-Set Mobility Model ● SetPositionAllocator() - Set Position Allocator – Install the mobility on Nodes – Mobility Model [Access Point & CSMA Nodes] ● ConstantPositionMobilityModel
- 18. Internet Stack & Ipv4Address ● Now its time to install Protocol Stack – InternetStackHelper ● Install() ● Assign IP address to the NetDevice – Ipv4InterfaceContainer ● Assign()
- 19. Application STA-1 STA-2 STA-3 AP CSMA P2P WIFI P1 P2 C1 C2 C3 C4 CLIENT SERVER UdpEchoServerHelper UdpEchoCientHelper
- 20. Animation ● AnimationInterface – Set Methods for Nodes ● Description – SetNodeDescription(NodeContainer,”AP”) ● Color – SetNodeColor(NodeContainer , R,G,B) ● Position – SetConstantPosition(Node,X,Y) ● Etc. – Add Background Image ● SetBackgroundImage(..,..,..,); vodi EnablePacketMetadata(boolean value)
- 22. ● Modify the Mobility Pattern using – RandomWalk2dMobilityModel ● Distance- Change current direction and speed after moving for this distance. ● Speed – speed of node ● Bounds – Area