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OMNET++ TUTORIAL FOR WIRELESS SENSOR NETWORK
Wireless Sensor Network (WSN) using OMNeT++ Simulator
OMNET++ TUTORIAL FOR WIRELESS SENSOR NETWORK (WSNs) are a special kind of mobile ad hoc network with particular characteristics, like for example, the severe computational and energy resources restrictions presented by their elements.
Features of wireless sensor network:
- Be robust against node failure.
- Not simply moving bits like another networks.
- Lifetime of individual nodes relatively unimportant.
- Traditional QoS metrics do not apply.
- Each node treated equivalently.
Application of wireless sensor networks:
- Use sensor nodes to observe wildlife.
- Drop sensor nodes from an aircraft over a wildfire.
- Monitor mechanical stress after earthquake.
- Reduce energy waste by proper humidity, ventilation, air conditioning control.
- For measuring temperature.
Sample code for wireless sensor network:
void WirelessChannel::handleMessage(cMessage * msg)
{ WirelessChannelNodeMoveMessage *mobilityMsg =
check_and_cast <WirelessChannelNodeMoveMessage*>(msg);
int srcAddr = mobilityMsg->getNodeID();
if (onlyStaticNodes)
opp_error(“Error: Rerceived WS_NODE_MOVEMENT msg, while onlyStaticNodes is TRUE”);
int oldCell = nodeLocation[srcAddr].cell;
nodeLocation[srcAddr].x = mobilityMsg->getX();
nodeLocation[srcAddr].y = mobilityMsg->getY();
nodeLocation[srcAddr].z = mobilityMsg->getZ();
nodeLocation[srcAddr].phi = mobilityMsg->getPhi();
nodeLocation[srcAddr].theta = mobilityMsg->getTheta();
if ((nodeLocation[srcAddr].x < 0.0) ||
(nodeLocation[srcAddr].y < 0.0) ||
(nodeLocation[srcAddr].z < 0.0)) opp_error(“Wireless channel received faulty WC_NODE_MOVEMENT msg. We cannot have negative node coordinates”); int xIndex = (int)floor(nodeLocation[srcAddr].x / xFieldSize * numOfXCells); if (((xIndex – 1) * xCellSize) >= nodeLocation[srcAddr].x)
xIndex–;
else if (xIndex >= numOfXCells) {
xIndex = numOfXCells – 1; // the maximum possible x index
if (nodeLocation[srcAddr].x > xFieldSize)
debug() << “WARNING at WC_NODE_MOVEMENT: node position out of bounds in X dimension!\n”; } int yIndex = (int)floor(nodeLocation[srcAddr].y / yFieldSize * numOfYCells); if (((yIndex – 1) * yCellSize) >= nodeLocation[srcAddr].y)
yIndex–;
else if (yIndex >= numOfYCells) {
yIndex = numOfYCells – 1; // the maximum possible y index
if (nodeLocation[srcAddr].y > yFieldSize)
debug() << “WARNING at WC_NODE_MOVEMENT: node position out of bounds in Y dimension!\n”; } int zIndex = (int)floor(nodeLocation[srcAddr].z / zFieldSize * numOfZCells); if (((zIndex – 1) * zCellSize) >= nodeLocation[srcAddr].z)
zIndex–;
else if (zIndex >= numOfZCells) {
zIndex = numOfZCells – 1; // the maximum possible z index
if (nodeLocation[srcAddr].z > zFieldSize)
debug() << “WARNING at WC_NODE_MOVEMENT: node position out of bounds in Z dimension!\n”;
}
int newCell = zIndex * zIndexIncrement + yIndex * yIndexIncrement + xIndex * xIndexIncrement;
if (newCell != oldCell) {
cellOccupation[oldCell].remove(srcAddr);
cellOccupation[newCell].push_front(srcAddr);
nodeLocation[srcAddr].cell = newCell;
}
break;
}
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