08-16-2017, 09:04 PM
how to set sleep and wakeup for nodes in ns2 in aodv
public:
AODV();
void CLUSTERING();
..
AODV.cc :
void AODV::CLUSTERING(){
if(current_){
while(numberofNodes){
// Selecting clusters
}
}
}
Now we know how the mechanism of ns2 works.so let's get started with sleep nodes.
First of all there is 4 functions in ns2 for turning a node to 'off', 'on', 'sleep', 'idle'. The difference between these are not so big.
As you know the 'off' function turns a node to off but it still broadcasts something based on your protocol.
$ns_ at 7.0 "$node(2) off"
And you can turn it on like :
$ns_ at 7.0 "$node(2) on"
The base is :
$simulator at $time "$Node_($number) off"
I don't know how to set a node to sleep in scenario.tcl but you can do that in your protocol's codes.
Now, to set a node to sleep we could do several things..
setting nodes to sleep from energy model
setting nodes to sleep from wireless physics
First we'll try energymodel.cc and if it didn't work we'll use the other one.
To set a node to sleep from energymodel.cc we can use this code in void Mac802_11::recv function in ns-2.35/mac/mac-802_11.cc :
if(index_ == myNode){
EnergyModel *em = netif_->node()->energy_model();
if (em && em->sleep()) {
em->set_node_sleep(1);
//em->set_node_state(EnergyModel::INROUTE);
}
}
Replace myNode with the number of the interface you want to set it to off.
If you are not using MultiInterface for your simulation so the number of interfaces will be equal to the number of your nodes.
example :
Normal :
node -- > interface --> channel
MultiInterface :
-- > interface[0] --
--
v
node -- -- > interface[1] -- > channel
^
--
-- > interface[2] --
Open a terminal and cd to your ns2 directory, for example if you have ns-allinone-2.35, cd to /ns-allinone-2.35/ns-2.35/ and now type make and inter. After it finished try to simulate your scenario.tcl.
Now if your simulation start and you see the nam file, when the nodes get the first packet, the shape of them must change from balck circle to black circle blue hexagon.
From then on the nodes must not send or receive any data packet.
If this way didn't work now it's the time to use the other option.
Go to /ns-2.35/mac/ and open wireless-phy.cc.
You'll see that at the end of the file it contains our 4 function that we need.
we can simply use those function on the wireless-phy.cc to set a node to sleep or off by just calling those functions.But we may need to use them in another layer like in mac.
To use those functions in mac-802_11.cc simply use the below code anywhere you want in mac-802_11.cc and add wireless-phy.cc to your mac headers:
#include "wireless-phy.h" // at the header of mac-802_11.cc
/*
* Use the below code in any function you want in mac
*/
Phy *p;
p=netif_;
((WirelessPhy *)p)->node_sleep();
And to use another one of those 4 function just change the function's name like ->node_sleep(); to ->node_wakeup();.