Use of Mobility models in ns-2

1
Use of Mobility models in ns-2

• Karthik Dantu
• Shyam Kapadia

2
Random Waypoint

• setdest n ltnum nodesgt p ltpause timegt s ltspeedgt
  t ltTimegt x ltxgt y ltygt
• 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
  gt scen-10-4-500

3
Traffic generation

• User cbrgen.tcl
• Syntax ns cbrgen.tcl -type cbrtcp -nn nodes
  seed seed -mc connections -rate rate
• Eg ns cbrgen.tcl -type cbr -nn 3 -seed 43578 -mc
  2 -rate 10.0 gt cbr-3-2-10
• Similarly TCP traffic can be generated

4
Pre-generated Scenarios

• ns/ns-2.1b8a/tcl/mobility/scene
• Scen-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

5
Pre-generated traffic patterns

• ns/ns-2.1b8a/tcl/mobility/scene
• cbr-50-10-4-512
• Nodes 50
• Max. Connections 10
• Seed 95813843.243
• Send Interval 4.0
• Other Examples
• cbr-10-1-10-20, cbr-50-20-4-512, cbr-3-test

6
Usage in ns scripts

• Mobility model and traffic pattern files are
  input to the ns script
• Eg .. 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)

7
Viewing traces

• Trace file Needs to be parsed
• Use awk or perl script at
• http//nile.wpi.edu/NS/Example/column
• r 160.093884945 _9_ RTR --- 1 tcp 1492 a2 4 6
  800 ------- 655 360 167779840 31 167779840
  1 0 2 0
• Eg cat out.tr grep RTR awk print 2 gt
  rtr-time.tr
• Gives 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

8
Visualization

• Using nam
• Enable tracing
• ns_ namtrace-all-wireless ltnamtracegt ltxgt ltygt
• mobilenode namattach ltnamtracefdgt
• ns_ node-config - agentTrace ON
• - routerTrace ON
• - macTrace ON