How to detect errors in message after put the bit error rate (ber) in the ned file.

[Martin Pons Mayol]

Hello group,

I'm working with an omnet project and this is my question:

I have configured the channel in my ned file like this:

simple Sender

{

    parameters:

        @display("i=block/routing");

        int packetLength @unit(byte) = default(128B);

    gates:

        input in;

        output out;

}

simple Receiver

{

    parameters:

        @display("i=block/process");

        int packetLength @unit(byte) = default(128B);

    gates:

        input in;

        output out;

}

channel Canal extends ned.DatarateChannel

{

datarate = 100Mbps;

delay = 100us;

ber = 1e-3;

}

Now, how I detect the error bits in the handleMessage method of the cc file? I mean, I want to count the messages that are transmitted with wrong bits through this channel.

The error bits are automatically generated or I have to obtain that ber in the cc file and I have to generate those?

[Alfonso Ariza Quintana]

The packet has a flag  hasBitError(), the channel computes the probability of errors and set the flag to true if the packet has an error, you only need to check it

 

If (pkt->hasBitError()) {

  // packet has errors,  discard it

  delete pkt;

  return;

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[Martin Pons Mayol]

Thank you man, I was working with cMessage instead of cPacked this is the cause that I didn't find any method like this.

[Asmae Bengag]

Hello
I am working with OMNeT++ project especially in Castalia , Plz How I calculate Bad Packets Ratio ?

Cordially

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[Alfonso Ariza Quintana]

Define Bad packet ratio. You can measure the PDR, number of packets received/sent.

[Asmae Bengag]

Thakns for your answer, Yes I Calculate  PDR(Packet Delivery Ratio) , And how I find the the number of failed packets received that did not pass the cyclic redundancy check (CRC) ? To use It in Bad Packet Ratio ?

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[Alfonso Ariza Quintana]

The application module usully records the number of packets received, and sent. The diference between both is the number of packets that have been discarded due to errors, collisions, queue overflows ….

The bit error is not the only cause that can make that a packet could be discarded.

 

 

De: omn...@googlegroups.com [mailto:omn...@googlegroups.com] En nombre de Asmae Bengag
Enviado el: miércoles, 16 de mayo de 2018 12:01
Para: omn...@googlegroups.com
Asunto: Re: [Omnetpp-l] How to detect errors in message after put the bit error rate (ber) in the ned file.

 

Thakns for your answer, Yes I Calculate  PDR(Packet Delivery Ratio) , And how I find the the number of failed packets received that did not pass the cyclic redundancy check (CRC) ? To use It in Bad Packet Ratio ?