[ns] question about energy model of 802.15.4
Dear All: recently I am doing simulations to compare SMAC and 802.15.4. I found that a problem about the 802.15.4 implemented in NS2. In the file p802_15_4mac.cc, there are some instruction about the sleep mode: //-- Notes for power-saving: // It turns out to be very difficult to apply sleeping model in 802.15.4. // First, a node shouldn't go to sleep if peer2peer transmission mode is // used. Non-peer2peer means that a node only communicates with its parent // and/or children, which requests that pure tree routing be used. // Second, even pure tree routing is used, a node can only go to sleep // if it satisfies both the sleeping condition as a parent (to its children) // and that as a child (to its parent) in a multi-hop environment. To // satisfy both conditions requires efficient scheduling scheme. // Since ns2, by default, treats the power consumption in idle mode same // as that in sleeping mode, it makes no difference at this moment whether // we set sleeping mode or not. This means that if I simulat a linear topology with 10 nodes, the source node sends packets to the sink node, then all the node along the path won't sleep at all,am I right? Then if we apply 802.15.4 to a cluster tree topology, it won't save any energy,right? Another question is that if I simulate a star topology, I still can't compare the energy efficiency of SMAC and 802.15.4. Since the idle energy power is much more than the sleep energy power in real node, I think that 802.15.4 treat the sleep mode as the idle mode is incorrect. Any one give me some suggestions? Thank you! your sincere David
[ns] Movements in wireless scenario
Hi I want to introduce movements in my wireless simulations (I'm using UM-OLSR), and for large numbers of nodes and movements I'm using SETDEST ( ns-2.29\indep-utils\cmu-scen-gen\setdest). An example of what this utility makes is following: $node_(12) set X_ 365.446284881986 $node_(12) set Y_ 72.300575449718 $node_(12) set Z_ 0. $god_ set-dist 0 1 16777215 $god_ set-dist 0 2 16777215 $god_ set-dist 0 3 16777215 $god_ set-dist 0 4 16777215 $god_ set-dist 0 5 16777215 $god_ set-dist 0 6 16777215 $god_ set-dist 0 7 16777215 I don't know how to implement SETDEST's movement because I don't know how to define god_ variable, can you help me? Thank you very much, I'm sorry for my poor english. Andrea
[ns] R: Movements in wireless scenario
Andrea, god is only used for statistical purposes. If you are interested in generating nodes movement simply use the 'setdest' command, ignoring god. E.g. $ns_ at 10.0 $node_(0) setdest X Y S where X,Y are the coords of destination and S is the speed (in m/s). bye, Marco Messaggio originale Da: [EMAIL PROTECTED] Data: 24-giu-2006 10.59 AM A: ns-usersns-users@ISI.EDU Ogg: [ns] Movements in wireless scenario Hi I want to introduce movements in my wireless simulations (I'm using UM-OLSR), and for large numbers of nodes and movements I'm using SETDEST ( ns-2.29\indep-utils\cmu- scen-gen\setdest). An example of what this utility makes is following: $node_(12) set X_ 365.446284881986 $node_(12) set Y_ 72.300575449718 $node_(12) set Z_ 0. $god_ set-dist 0 1 16777215 $god_ set-dist 0 2 16777215 $god_ set-dist 0 3 16777215 $god_ set-dist 0 4 16777215 $god_ set-dist 0 5 16777215 $god_ set- dist 0 6 16777215 $god_ set-dist 0 7 16777215 I don't know how to implement SETDEST's movement because I don't know how to define god_ variable, can you help me? Thank you very much, I'm sorry for my poor english. Andrea
[ns] MultiState error model
Hello Could anyone tell me how to create a multistate error model in NS-2 ? I used the example for documentation but it's behaving in a strange way... I want my multistate error model to have from time 0 to 30 loss rate equal to 0.1% from time 30 to 60 loss rate equal to 10% and from time 60 to 100 loss rate equal to 1%. Could you tell me how to do it? -- Best regards, Kacper Kurowski
[ns] TCL variable substitution problem
Hello,
I have the following problem regarding TCL variable substitution
I have the following code in ns2:
set Appl_udp_0_1 [new Agent/UDP]
$ns attach-agent $n(0) $Appl_udp_0_1
$Appl_udp_0_1 set class_ 1
where the first number in $Appl_udp_0_1 (i.e 0) characterizes the node the
UDP agent is running and the second number (ie. 1) the flow id.
In a procedure i have the following parameters
proc test { src flowid} {
global Appl_udp_$src_$flowid
}
My problem is that TCL takes as variable the $src_ (including the _
character) and as a result shows that a variable $src_ does not exist.
Is there a way i can make the variable expression to stop before the _
character ??
Thank you.
--
Nicholas Loulloudes
Postgraduate at Communication Networks and Software.
BSc in Computer Science.
