How to apply multi-radio and multi-channel in CR (Cognitive Radio) Macng MAC using NS2?


In the code segment given below, collision free MAC Macng is used in which channel negotiation among nodes is done via the common control channel.

TCL part :

set val(chan)Channel/WirelessChannel; #Channel Type
set val(prop)Propagation/TwoRayGround; #Radio propagation model
set val(netif)Phy/WirelessPhy; #Network interface type
set val(ant)Antenna/OmniAntenna; #Antenna model
set val(rp)AODV;#Routing Protocol
set val(ifq)Queue/DropTail/PriQueue;# interface queue type
set val(ifqlen)50;# max packet in ifq
set val(mac)Mac/Macng;# MAC type
set val(ll)LL;# link layer type
set val(nn)6;# number of mobilenodes
set val(channum)3;# number of channels per radio
set val(cp)./topo4.tcl; # topology traffic file
set val(stop)50;# simulation time

# ==================================================================

# Main Program

# ======================================================================

# Initialize Global Variables

set ns_ [new Simulator]

set tracefd [open ./ w]

$ns_ trace-all $tracefd

# set up topography object

set topo [new Topography]

$topo load_flatgrid 1000 1000

#create nam

set namtrace [open ./test.nam w]

$ns_ namtrace-all-wireless $namtrace 1000 1000

# Create God

set god_ [create-god $val(nn)]

# configure node

$ns_ node-config -adhocRouting $val(rp) -llType $val(ll) -macType $val(mac) -ifqType $val(ifq) -ifqLen $val(ifqlen) -antType $val(ant) -propType $val(prop) -phyType $val(netif) -topoInstance $topo -agentTrace ON -routerTrace ON -macTrace ON -movementTrace ON

for {set i 0} { $i < $val(channum)} {incr i} {

set chan_($i) [new $val(chan)]


for {set i 0} {$i < $val(channum) } {incr i} {

$ns_ add-channel $i $chan_($i)


#Configure for channels

$ns_ node-config -channel $chan_(0) -ChannelNum $val(channum)

for {set i 0} {$i < $val(nn) } {incr i} {

set node_($i) [$ns_ node]

$node_($i) set recordIfall 1

$node_($i) random-motion 0 ;# disable random motion