Delay - Jitter Estimation

[Griffinz]

Dear All,

I would like to calculate the packet end to end delay and jitter without using Flow monitor.
I did see the delay-jitter estimation module in the src/tools folder but I am not sure how to use it.
Please help me.

-- Griffinz

[redfirehead]

Hello Griffinz,

I have the same problem.
Do you or someone else have an example how to use the DelayJitterEstimation class?

Regards,
Rene

[raju_f7]

Hi Rene,

Can you tell me why you are not interested without using Flow Monitor to check delayJitter?Because for my sumulation, i am using flow monitor?Is there any benefit for that?

BR

Raju 

[redfirehead]

Hi Raju,

Because the FlowMonitor displays only the mean values for delay, jitter aso.
But I need the values of each individual packet to calculate more statistical data such MIN, MAX, AVG, varince/distribution (PDF).

cheers,
Rene

[Konstantinos]

Hi Rene,

I haven't used DelayJitterEstimation class my self but from the API, I figured out that you have to create one instance of the class and call the PrepareTx() method just before the packet is send, for example embed it in one of the traffic generator applications (e.g. OnOffApplication).

Then create another instance of the DelayJitterEstimation, and call the RecordRx() every time you receive a packet.

Then you can call the GetLastJitter to get the jitter of the packet.

[redfirehead]

Hi Konstantinos,

Thanks for your hint. Yes you are right, it works that way.
In the meantime I found two over threads with examples of this class:

https://groups.google.com/forum/#!searchin/ns-3-users/delay$20estimation/ns-3-users/2YKYEA9kneg/u0GcdMEBhXUJ
https://groups.google.com/forum/#!searchin/ns-3-users/delay$20estimation/ns-3-users/nx9sYYH1tSM/1ikV7S4jy90J

[raven]

Hi redfirehead ,

              First of all, you can write AWK script for calculating the jitter and script will read data from trace file generated after simulation According to your requirement.

[Matija Naglic]

Hi all!

Have someone managed to join the  DelayJitterEstimation.cc with the OnOffHelper?

Some simple example for start would be good as well.

Thank you!

Matija

[Tommaso Pecorella]

Hi,

Kostantino's suggestion is right, and you don't have to touch the helper. It's the application that have to be modified.

Please follow Kostantinos's suggestions (especially because he already gave the right suggestion).

T.

[Matheus Portillo]

Hello

Matija is right.

Konstantinos said all one have to do is call PrepareTx through some Traffic Factory as OnOffApplication.

But apparently the only way to do so is to add a Callback to the sockets create by the Factory, and no socket Callback (DataSentCallback & SendCallback) function pass the packet reference that PrepareTx needs.

Can anyone correct me if I am wrong? Is the only solution to create a custom callback function?

Thanks a lot.

-m

[Konstantinos]

Hi Matheus,

what do you mean that the only way to do so is to add a callback to the sockets?

Please give more details about your scenario. You can use the Tx trace source from the OnOffApplication to have a reference to the packet for your PrepareTx. 

Regards,

K

[kAZEEM HAMMED]

Hi kostantinos, how do i vary the packet size of on/off helper.i noticed that the default packet sent and received is 488k. i want to measure some qos parameters of the mpls based network i developed

[Konstantinos]

Hi Kazeem,

Please do not post your questions in unrelated threads. 

Before you ask a new question, please search the list. It has been discussed in the past.

The packet size is an attribute of the OnOffApplication, not the helper.

By default, the packet size is assumed to be fixed for the duration of the simulation. 

In order to change to dynamic packet size, you should introduce a random variable for it.

Also, note the default packet size is not 488k. Please check more carefully your scenario.

Regards,

K.