How to calculate data packet delivery ratio in wpan

[Đạt Lê khánh]

Hello everyone,

I want to caculate data packet delivery ratio in starnet module.Firstly, I saw in "Ieee802154TestApp.cc" having code to caculate end to end delay and mean end to end delay vector.

void Ieee802154TestApp::handleLowerMsg(cMessage* apMsg)

{

    simtime_t e2eDelay;

    Ieee802154AppPkt* tmpPkt = check_and_cast<Ieee802154AppPkt *>(apMsg);

    e2eDelay = simTime() - tmpPkt->getCreationTime();

    totalByteRecv += tmpPkt->getByteLength();

    e2eDelayVec.record(SIMTIME_DBL(e2eDelay));

    numReceived++;

    sumE2EDelay += e2eDelay;

    meanE2EDelayVec.record(sumE2EDelay/numReceived);

    EV << "[APP]: a message sent by " << tmpPkt->getSourceName() << " arrived at application with delay " << e2eDelay << " s" << endl;

    delete apMsg;

Then, in file " Ieee802154TestApp.h " i add this line "cOutVector packetDEliveryRatioVec;" for declaring the PDR operator.
Back to  "Ieee802154TestApp.cc", i add "packetDeliveryRatioVec.record (???????) " below "  meanE2EDelayVec.record(sumE2EDelay/numReceived)";

"(?????)" mean i have bo idea to write the code in this

So, please, help me, how to caculate and record PDR in starnet module

[Michael Kirsche]

I would argue that the "Packet Delivery Ratio" shouldn't be calculated / collected in a vector, but in a scalar value like Goodput/Throughput.

As far as I understand the packet delivery ratio, then it is: Sum(packets_received) / Sum(packets_sent)

And this value should probably be calculated at the end of the simulation.
Any special reason you want to calculate it as a vector / for every packet reception?

Calculating it as a scalar is as simple as dividing numReceived through mNumTrafficMsgs in the finish() function of Ieee802154TestApp, just like the other scalar values already there.

[Lê Khánh Đạt]

Hello Michael, 

Thanks for your answer. I see in "Ieee802154TestApp.h" file has parametters: mNumTrafficMsgs, mNumTrafficMsgRcvd,  numReceived, totalByteRecv. Can you explain to me the meaning of these parameters? I was confused by  numReceived and  mNumTrafficMsgRcvd.

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[Michael Kirsche]

Hmm, isn't it obvious from the actual source code?

numReceived is increased in handleLowerMsg whenever a message is received from the lower layers (aka the radio).

mNumTrafficMsgs is increased in SendTraf when a new (traffic) message is generated and then sent to the lower layers.

[Lê Khánh Đạt]

in my starnet module, i set host [0]​ is destination node and others node send data to host [0]. host [0] just received data and doesnt send it. I want to calculate PDR on host[0].

this is my code to calculate PDR " recordScalar("packetDeliveryRatio",numReceived/mNumTrafficMsgs); " but the result is infinity because  host[0] doesnt send data and mNumTrafficMsgs is the code to record the trafficsent only at each host not total host ( number/0 = infinity) . So, do you know how to calculate total trafficsent of module?

[Michael Kirsche]

node[0] doesn't sent, so he has no packet delivery ratio.

You want to know the overall packet delivery ratio of your whole network? Or for a single node?
For a single node, he has to transmit data... for the overall network, you can do post-processing of your results either in Excel or via the Analyze tool in OMNeT and select the appropriate statistic variables and do some calculations with them.

[Lê Khánh Đạt]

That mean, i have result of nNumreceived, and trafficsent of others node expect node0. So i can calculate PDR on exel.

thank you very much

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