End-to-end delays

[Fabio Nieri <nieri@magna.ing.unipi.it>]

Hi,
I am trying to find the end to end delay of a packet in a wireless
network. I read the following script suggested by Lloyd Wood:

BEGIN {
# simple awk script to generate end-to-end packet lifetime statistics
# in a form suitable for plotting with xgraph.
# Lloyd Wood, July 1999.
# http://www.ee.surrey.ac.uk/Personal/L.Wood/ns/

highest_packet_id = 0;
}

{
action = $1;
time = $2;
node_1 = $3;
node_2 = $4;
src = $5;
flow_id = $8; 
node_1_address = $9;
node_2_address = $10; 
seq_no = $11;
packet_id = $12;

if ( packet_id > highest_packet_id ) highest_packet_id = packet_id;

# getting start time is not a problem, provided you're not starting
# traffic at 0.0.
# could test for sending node_1_address or flow_id here.
if ( start_time[packet_id] == 0 ) start_time[packet_id] = time;

# only useful for small unicast where packet_id doesn't wrap.
# checking receive means avoiding recording drops
if ( action != "d" ) {
if ( action == "r" ) {
# could test for receiving node_2_address or flow_id here.
end_time[packet_id] = time;
}
} else {
end_time[packet_id] = -1;
}
} 
END {
for ( packet_id = 0; packet_id <= highest_packet_id; packet_id++ ) {
start = start_time[packet_id];
end = end_time[packet_id];
packet_duration = end - start;

if ( start < end ) printf("%d %f\n", start, packet_duration);
}
}

How can I modify the script for the new trace format of a wireless
simulation?
Is there any other way to compute and plot statistics of the traffic from
the trace file?

Thanks 
Fabio Nieri