Use of Mobility models in ns-2

Karthik DantuShyam Kapadia

Random Waypointsetdest –n <num nodes> –p <pause time> –s

<speed> –t <Time> –x <x> –y <y> Parameters

Number of nodes (N) Pause Time (P) Max speed (S) Simulation Time (T) Max X (X) Max Y(Y)

Eg: ./setdest -n 10 -p 4 -s 5 -t 10 -x 500 -y 500 > scen-10-4-500

Traffic generation User cbrgen.tcl

Syntax: ns cbrgen.tcl [-type cbr|tcp] [-nn nodes] –seed [seed] [-mc connections] [-rate rate]

Eg: ns cbrgen.tcl -type cbr -nn 3 -seed 43578 -mc 2 -rate 10.0 > cbr-3-2-10

Similarly TCP traffic can be generated

Pre-generated Scenarios ~ns/ns-2.1b8a/tcl/mobility/sceneScen-1500x300-60-0-20-2

Area – 1500x300 Nodes – 60 Pause time – 0.0 Max speed – 20.00 Time 900s

Other files Scen-670X670-50-600-20-0, Scen-670X670-

50-600-20-1, Scen-670X670-50-600-20-2

Pre-generated traffic patterns ~ns/ns-2.1b8a/tcl/mobility/scenecbr-50-10-4-512

Nodes – 50 Max. Connections – 10 Seed – 95813843.243 Send Interval – 4.0

Other Examplescbr-10-1-10-20, cbr-50-20-4-512, cbr-3-

test

Usage in ns scripts Mobility model and traffic pattern

files are input to the ns scriptEg: .. From wireless-test.tcl

set opt(cp) "../mobility/scene/cbr-3-test"set opt(sc) "../mobility/scene/scen-3-test”……Source $opt(cp)Source $opt(sc)

Viewing traces Trace file – Needs to be parsed Use awk or perl script athttp://nile.wpi.edu/NS/Example/columnr 160.093884945 _9_ RTR --- 1 tcp 1492 [a2 4 6 800] -------

[655 36:0 16777984:0 31 16777984:0] [1 0] 2 0Eg: cat out.tr | grep “RTR” | awk ‘{print $2}’ > rtr-time.trGives trace of times of RTR packets.Revised Trace Format s -t 0.267662078 -Hs 0 -Hd -1 -Ni 0 -Nx 5.00 -Ny 2.00 -Nz

0.00 -Ne -1.000000 -Nl RTR -Nw --- -Ma 0 -Md 0 -Ms 0 -Mt 0 -Is 0.255 -Id -1.255 -It message -Il 32 -If 0 -Ii 0 -Iv 32

- detailed explanation in NS Manual Chapter 16

Visualization Using nam

Enable tracing1. $ns_ namtrace-all-wireless <namtrace>

<x> <y>2. $mobilenode namattach <namtracefd>

$ns_ node-config - agentTrace ON - routerTrace ON - macTrace ON