Can you explain to me the meaning of this code

[Đạt Lê khánh]

In inetmanet / src / wpan / applications / Ieee802154TestApp / Ieee802154TestApp.cc. 

void Ieee802154TestApp::handleLowerMsg(cMessage* apMsg)
{
...
  simtime_t e2eDelay;

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

    e2eDelay = simTime() - tmpPkt->getCreationTime();
    e2eDelayVec.record(SIMTIME_DBL(e2eDelay));
....
}

and 

sumE2EDelay += e2eDelay;
meanE2EDelayVec.record(sumE2EDelay/numReceived);

I know this code to calculate delay by dont understand meaning of these, Can you explain to me? 

thank you!

[Alfonso Ariza Quintana]

1.- End to end delay vector

2.- mean end-to-end delay

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[Đạt Lê khánh]

Can you explain this in more detail? For example, 

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

What is meaning of this line code?

Vào 14:58:22 UTC+7 Thứ ba, ngày 25 tháng mười một năm 2014, Alfonso Ariza Quintana đã viết:

[Michael Kirsche]

Simple...
end-to-end-delay is calculated by substracting the creation time (getCreationTime) of the received packet from the current time (simTime).

[Lê Khánh Đạt]

what is "creation time", can you give me an example? 

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[Michael Kirsche]

You're kidding right?

getCreationTime -> time that the message was created.
This is more than obvious...

[Đạt Lê khánh]

I know meaning of  this code. in fact, I am confused in code delay calculation. In more detail, I set up time between two consecutive packets is exponential(10s), exponential(5s) is Time that the first packet is sent. That mean after  10s a new packet will be sent. For example, Current time is 310s i think in this case simTime = 310s and i dont know what is value of creationTime? sorry for my lack of knowledge.

Vào 05:57:41 UTC+7 Thứ tư, ngày 26 tháng mười một năm 2014, Michael Kirsche đã viết:

[Mohsen Sichani]

Hi

The attached book is Official OMNET++ manual guide, please see 

7.4.4 Random Variates

You will find the answer of your question there.

Good luck

[Mohsen Sichani]

plz also take a look at this topic

https://groups.google.com/forum/#!topic/omnetpp/dWOKQhspZsI

On Wednesday, November 26, 2014 4:12:19 PM UTC+13, Đạt Lê khánh wrote:

[Alfonso Ariza Quintana]

A very common model used to arrival packets is the Poisson distribution, this distribution set the mean number of packet per unit time. The Poisson distribution is modeled using a exponential distribution.

Poisson distribution with mean N arrival packet per second, equivalent to an exponential arrival time between packets of mean 1/N

[FEIT]

Hi Alfonso, under sensornetwork>>omnetpp.ini file, I found the following code. Would you please explain me what's the  startTime parameter for and why it is exponential(1s)?

*.sensor*.app[0].sendInterval = 1s
*.sensor*.app[0].startTime = exponential(1s)

Thank you

[Alfonso Ariza Quintana]

It is the time that the application module Will start to send packets, the use a random distribution is to force that the application module could be not synchronized, in other case, all the app modules will start the transmission exactly at the same time, that is not a very realistic assumption, that all the nodes could start the transmission exactly at the same time

 

Enviado desde Correo para Windows 10

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