MOBILE IP SOMULATION IN NS2 Presenter: 吳寶緣

Outlines  Overview  Hierarchical Address Format  Hierarchical Address Format-ex  MoblieIP Demo  Additional Number of Node feature  Additional Movement of Node feature  Problems & Solutions

Overview  Multicast Address Format  Of the higher bits, 1 bit is assigned for multicast.  Address Space 32 bits for node id and 32 bits for port id, also  ~ns/tcl/lib/ns-address.tcl

Hierarchical Address Format  Default levels, 3 levels – (10, 11, 11) bits  (9, 11, 11) bits for multicast $ns set-address-format hierarchical  Specific hierarchical setting  For example: $ns set-address-format hierarchical  Splits into 2 levels, first level and second level are 8 and 15 bits, respectively

Hierarchical Address Format-ex  -  set ns [new Simulator]  $ns set-address-format hierarchical  $ns node-config -addressType hierarchical  -  AddParams set domain_num_ 2  AddParams set cluster_num_ 2 1  AddParams set nodes_num_ W(0) W(1) BS(0) node_(1) node_(0) node_(2) domain 0 domain 1 cluster 0 cluster 1 cluster 0 0,0,0 0,1,0 1,0,0 1,0,1 1,0,2 1,0,3

CHAPTER 16 MOBILE AND WIRELESS NETWORK SIMULATION

Outlines  Extend NS to support mobile and wireless application: Internal Implementation  Use NS to simulate wireless network  Feature summary

Abstract the real mobile world for simulation  Node  Packets  Wireless channel and channel access  Forwarding and routing  Radio propagation model  Trace/Visualization  Event scheduler to make everything running

Network Components inside a mobilenode  Link Layer  ARP  Interface Queue  Mac Layer: IEEE  Network Interface  Radio Propagation Model  Friss-space attenuation(1/ ) at near distance  Two ray Ground (1/ ) at far distance

Implementing mobile node by Extending “standard” NS node Classifier: Forwarding Agent: Protocol Entity Node Entry Node ARP Radio Propagation Model MobileNode LL MAC PHY LL CHANNEL LL MAC LL:Link layer object IFQ:Interface queue MAC:Mac object PHY PHY:Net interface Routing

Mobilenode Object Implemented in C++  The mobility features  node movement  periodic position updates  maintaining topology boundary  etc implemented in Otcl  MobileNode itself  Classifiers  Dmux  LL  Mac  Channel  etc

Outlines  Extend NS to support mobile and wireless application: Internal implementation  Use NS to simulate wireless network  Feature summary

A mobile node abstraction  Location  coordinates (x,y,z)  Movement  speed,direction, starting/ending location,time...  Forwarding  Network stack for channel access  IEEE

Creating Node movements  Start position:  $node set X_  $node set Y_  $node set Z_  Future destinations:  $ns at $time $node setdest  Ex: ns at 3.0 "$node (0) setdest  the third dimension (Z) is not used.

Creating Node movements  random movement  $mobilenode start  Set topology  set topo [new Topography]  $topo load_flatgrid $opt(x) $opt(y) opt(x) and opt(y) are the boundaries used in simulation

Network Components in a mobilenode  MobileNode method add-interface() in ~ns/tcl/lib/ns-mobilenode.tcl

MAC layer protocols  MAC protocol  See ~ns/mac-802_11.{cc,h} for implementation details.  Preamble based TDMA protocol  See ~ ~ns/mac-tdma.{cc,h}  ns supports a single hop, preamble-based TDMA MAC protocol  multi-hop environment are not considered  TDMA frame contains preamble data transmission slots  avoid unnecessary power consumption set_node_sleep().

Routing Agents  DSDV  messages are exchanged between neighbouring mobilenodes  ~ns/dsdv directory and ~ns/tcl/mobility/dsdv.tc  DSR  checks every data packet for source-route information. X-Routing queries  ~ns/tcl/mobility/dsr.tcl  TORA  ns/tora directory and ns/tcl/mobility/tora.tcl  AODV  ns/aodv and ns/tcl/lib/ns-lib.tcl

A simple wireless simulation(1)  Scenario  containing 3 mobile nodes  moving within 670mX670m flat topology  using DSDV ad hoc routing protocol  Random Waypoint mobility model  TCP and CBR traffic  See:  ns-2/tcl/ex/wireless-demo-csci694.tcl

A simple wireless simulation(2) set ns_ [new Simulator] ; create a ns simulator instance #Define Global Variables set topo [new Topography] ; create a topology and $topo load_flatgrid ; define it in 670x670 area

A simple wireless simulation (3) #Define standard ns/nam trace set tracefd [open 694demo.tr w] $ns_ trace-all $tracefd set namtrace [open 694demo.nam w] $ns_ namtrace-all-wireless $namtrace

A simple wireless simulation (4) #Create “God” set god_ [create-god 3] God is used to store an array of the shortest number of hops required to reach from one node to an other. For example: $ns_ at “$god_ setdist 2 3 1”

A simple wireless simulation (5) #Define how a mobile node should be created $ns_ node-config -adhocRouting DSDV\ -llType LL \ -macType Mac/802_11\ -ifqLen 50 \ -ifqType Queue/DropTail/PriQueue \ -antType Antenna/OmniAntenna \ -propType Propagation/TwoRayGround \ -phyType Phy/WirelessPhy \ -channelType Channel/WirelessChannel \ -topoInstance $topo -agentTrace ON \ -routerTrace OFF \ -macTrace OFF

A simple wireless simulation (6) #Create a mobile node and attach it to the channel set node [$ns_ node] $node random-motion 0 ;# disable random motion – Use “for loop” to create 3 nodes: for {set i < 0} {$i<3} {incr i} { set node_($i) [$ns_ node] }

A simple wireless example(7) #Define traffic model source traffic-scenario-files #Define node movement model source movement-scenario-files

A simple wireless example(8) #Define node initial position in nam for {set i 0} {$i < 3 } { incr i} { $ns_ initial_node_position $node_($i) 20 } #Tell ns/nam the simulation stop time $ns_ at “$ns_ nam-end-wireless ” $ns_ at “$ns_ halt” #Start your simulation $ns_ run

Wireless Scenario Generator(1)  Mobile Movement Generator./setdest -n -p pausetime -s -t -x -y See an example  Random movement $mobilenode start Source: See ns-2/indep-utils/cmu-scen-gen/setdest/

Wireless Scenario Generator(2)  Generating traffic pattern files  CBR traffic ns cbrgen.tcl [-type cbf|tcp] [-nn nodes] [- seed seed] [-mc connections] [-rate rate]  TCP traffic ns tcpgen.tcl [-nn nodes] [-seed seed] See an example Source: See ns-2/indep-utils/cmu-scen-gen/

Sensor Node extension  Node is energy-aware  Define node by adding new options: $ns_ node-config -energyModel EnergyModel -initialEnergy txPower0.6 -rxPower0.2

Demo  Wireless-demo-csci694.tcl  MobleIP.tcl

Outlines  Extend NS to support mobile and wireless application: Internal implementation  Use NS to simulate wireless network  Feature summary

Feature summary  Creating Wireless Node  Mac Layer:IEEE ,TDMA  Address Resolution Protocol (ARP)  Ad hoc routing protocols: DSDV, DSR,TORA, AODV  Radio Propagation Model  Friss-space attenuation at near distances  Two ray ground at far distances  Antenna: an omni-directional antenna having unity gain  Scenario generator for traffic and node movement

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Appendix A: Movement file $node_(2) set Z_ $node_(2) set Y_ $node_(2) set X_ $node_(1) set Z_ $node_(1) set Y_ $node_(1) set X_ $node_(0) set Z_ $node_(0) set Y_ $node_(0) set X_ $ns_ at "$node_(2) setdest " $ns_ at "$node_(1) setdest " $ns_ at "$node_(0) setdest " Movement scenario generator cd ns-allinone-2.35/ns-2.35/indep-utils/cmu-scen-gen/setdest./setdest -n 3 -p 2.0 -s t 300 -x 670 -y 670 > pattern-file Num-of-nodesPause-timeMax-speedSim-timeTopo-boundary

Appendix B: Traffic Scenario set udp_(0) [new Agent/UDP] $ns_ attach-agent $node_(0) $udp_(0) set null_(0) [new Agent/Null] $ns_ attach-agent $node_(2) $null_(0) set cbr_(0) [new Application/Traffic/CBR] $cbr_(0) set packetSize_ 512 $cbr_(0) set interval_ 4.0 $cbr_(0) set random_ 1 $cbr_(0) set maxpkts_ $cbr_(0) attach-agent $udp_(0) $ns_ connect $udp_(0) $null_(0) $ns_ at "$cbr_(0) start" …….  Traffic scenario generator ns cbrgen.tcl -type tcp -nn 25 -seed 0.0 -mc 8 > pattern-file ns cbrgen.tcl -type cbr -nn 10 -seed 1.0 -mc 8 -rate 4.0 > pattern-file CBR-or-TCPNum-of-nodesRandom-seedMax-connectionCBR-rate