/** Handles data arriving at UP port */
protected synchronized void dataArriveAtUpPort(Object data_, drcl.comp.Port upPort_) {
if (!(data_ instanceof TargetPacket)) {
error(data_, "dataArriveAtUpPort()", upPort_, "unknown object");
return;
}
// get most up-to-date location from SensorMobilityModel
SensorPositionReportContract.Message msg = new SensorPositionReportContract.Message();
msg = (SensorPositionReportContract.Message) mobilityPort.sendReceive(msg);
double Xc = msg.getX();
double Yc = msg.getY();
double Zc = msg.getZ();
/* Forward the packet received from the TargetAgent to the channel
so that other neighboring sensors can receive it */
System.out.println(
"Target "
+ nid
+ ": generating signal at time "
+ getTime()
+ " loc: "
+ Xc
+ ", "
+ Yc
+ ", "
+ Zc);
downPort.doSending(
new SensorNodeChannelContract.Message(
nid,
Xc,
Yc,
Zc,
Pt,
Radius,
new TargetPacket(((TargetPacket) data_).size, ((TargetPacket) data_).data)));
}
/** Handles data arriving at Channel port */
protected synchronized void dataArriveAtChannelPort(Object data_) {
long s;
if (gen == null) {
s = SEED_RNG;
// Uncomment the following line to get different results in every run
// s = (long)(Math.abs(java.lang.System.currentTimeMillis()*Math.random()*100)) ;
gen = new GaussianDistribution(NOISE_MEAN, NOISE_VAR, s);
}
// get most up-to-date location of the node (i.e., the receiver
// of the message) from SensorMobilityModel
SensorPositionReportContract.Message msg = new SensorPositionReportContract.Message();
msg = (SensorPositionReportContract.Message) mobilityPort.sendReceive(msg);
double Xc = msg.getX();
double Yc = msg.getY();
double Zc = msg.getZ();
// extract the location of the sender from the message being received
double Xs, Ys, Zs; // position of the sender
SensorNodeChannelContract.Message msg2 = (SensorNodeChannelContract.Message) data_;
Xs = msg2.getX();
Ys = msg2.getY();
Zs = msg2.getZ();
// extract also the power with which the packet was sent
double Pt_received; // Pt of the received packet
Pt_received = msg2.getPt();
long target_nid = msg2.getNid();
// make up a SensorRadioPropagationContract to ask the
// propagation model to reply with the received signal strength
SensorRadioPropagationQueryContract.Message msg3 =
(SensorRadioPropagationQueryContract.Message)
propagationPort.sendReceive(
new SensorRadioPropagationQueryContract.Message(
Pt_received, Xs, Ys, Zs, Xc, Yc, Zc));
double Pr = msg3.getPr();
if (Pr < RxThresh) {
System.out.println(
"SensorPhy nid=" + nid + " Packet was discarded because Pr = " + Pr + " < " + RxThresh);
} else {
double af = Pr; // attenuation factor
int size = ((TargetPacket) msg2.getPkt()).size;
TargetPacket sensorPkt = new TargetPacket(size, ((TargetPacket) msg2.getPkt()).data);
lastNoisePower = 0.0;
double rd;
for (int k = 0; k < sensorPkt.size; k++) {
sensorPkt.data[k] = sensorPkt.data[k] * af; // attenuate the signal
rd = gen.nextDouble();
double noise = noiseStrength * rd;
sensorPkt.data[k] = sensorPkt.data[k] + noise;
lastNoisePower = lastNoisePower + (noise * noise);
} // end for
lastNoisePower = lastNoisePower / ((double) size);
// Forward the data packet up to the sensor agent
toAgentPort.doSending(
new SensorAgentPhyContract.Message(
lastNoisePower, new TargetPacket(size, sensorPkt.data), target_nid));
} // end else
} // end dataArriveAtChannelPort