VARIABLE BIT RATE [VBR] IMPLEMENTATION IN NS2

We just made a VBR application that randomly change rate or bursts depending on parameters set.

In order to use it in ns you have to follow:

1. Include vbr_traffic.o in Makefile.in 
2. Preferrably set the default values in /home/user/Desktop/ns-allinone-2.35/ns-2.35/tcl/lib 
3. Run ./configure in your ns-allinone-2.35 directory 
4. Run make depend in ns-allinone-2.35
5. Run make

Now your VBR is ready.

Default values in ns-default.tcl:

Application/Traffic/VBR set rate_ 448Kb ;# corresponds to interval of 3.75ms 
Application/Traffic/VBR set rate_dev_ 0.25; 
Application/Traffic/VBR set rate_time_ 2.0; 
Application/Traffic/VBR set burst_time_ 1.0; 
Application/Traffic/VBR set n_o_changes_ 10; 
Application/Traffic/VBR set time_dev_ 0.5; 
Application/Traffic/VBR set constant_ false; 
Application/Traffic/VBR set maxrate_ 648Kb; 
Application/Traffic/VBR set packetSize_ 210; 
Application/Traffic/VBR set maxpkts_ 268435456; # 0x10000000


For vbr .cc file, Click here
For ns-default.tcl, Click here


VBR SYNTAX:

set vbr [new Application/Traffic/VBR]
$vbr set rate_ 448Kb
$vbr set rate_dev_ 0.25
$vbr set rate_time_ 2.0
$vbr set burst_time_ 1.0
$vbr set n_o_changes_ 10
$vbr set time_dev_ 0.5
$vbr set constant_ false
$vbr set maxrate_ 648Kb
$vbr set packetSize_ 210
$vbr set maxpkts_ 268435456
$vbr attach-agent $udp


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