Dear all,
I'm trying to test the following scenario and I would appreciate your feedback.
I have three wireless nodes in a row, 0, 1 and 2. Each node supports multiple
interfaces, but for this scenario the nodes are configured with one interface
communicating over 802.15.4. A cbr connection is set between 0 and 2, so that
packets would flow between 0->1 and 1->2.
When I configure all the nodes with the following code, the network communicates
as expected.
for {set i 0} {$i < 3 } {incr i} {
$ns_ add-channel 0 $chan_(0) # associate channel with interface 0
[$node_($m) set netif_(0)] set Pt_ 0.003162
[$node_($m) set netif_(0)] set freq_ 2.45e+9
set dist(-90dbm) 1e-12
[$node_($m) set netif_(0)] set CPThresh_ 10.0
[$node_($m) set netif_(0)] set CSThresh_ $dist(-90dbm)
[$node_($m) set netif_(0)] set RXThresh_ $dist(-90dbm)
[$node_($m) set netif_(0)] set channel_number_ 20 # freq 2.45e+9 is on channel
20
}
However, when I configure nodes 0 and 2 to use the same frequency but node 1 to
use
a different frequency, the network still operates and gives exactly the same
results as previously.
$ns_ add-channel 0 $chan_(0) # this is configured for each node
# $m = 0,1,2
[$node_($m) set netif_(0)] set Pt_ 0.003162
set dist(-90dbm) 1e-12
[$node_($m) set netif_(0)] set CPThresh_ 10.0
[$node_($m) set netif_(0)] set CSThresh_ $dist(-90dbm)
[$node_($m) set netif_(0)] set RXThresh_ $dist(-90dbm)
#
[$node_(0) set netif_(0)] set freq_ 2.45e+9
[$node_(0) set netif_(0)] set channel_number_ 20
[$node_(1) set netif_(0)] set freq_ 2.48e+9
[$node_(1) set netif_(0)] set channel_number_ 26
[$node_(2) set netif_(0)] set freq_ 2.45e+9
[$node_(2) set netif_(0)] set channel_number_ 20
Since node 1 is set on a different frequency I would expect that the nodes
could
not communicate.
Is this a bug or am I doing something wrong?
Thank you in advance,
Lup.
