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sns3 / sns3-satellite

Satellite module for ns-3 simulator
https://www.sns3.org
GNU General Public License v3.0
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Adapting SNS3 to LEO Satellites (Follow-up) #21

Closed FizzaRaza97 closed 3 years ago

FizzaRaza97 commented 4 years ago

Thank you for the response. I would really appreciate if you could help me a little more. My basic implementation is as follows: I have scheduled events that update the position of the satellite to pre-specified longitude, latitude and altitude. Can I expect this event to cascade, seeing as there are mobility observers installed to the ground stations in satellite-helper.cc? I am running the predefined simple scenario, with simulation time 50s. There are 2 flows running from user A to B and vice versa, with user A being a UT and user B being behind the GW. I update the longitude and latitude values at 1,2 and 10s into the simulation.

Currently, I am getting the following exception after the last update. "msg="Starting reception of a packet when receiving DA transmission!", file=../../contrib/satellite/model/satellite-phy-rx-carrier.cc, line=322 terminate called without an active exception"

I will appreciate any help you can provide on this. Thanks!

Originally posted by @FizzaZafar in https://github.com/sns3/sns3-satellite/issues/20#issuecomment-680880552

pravenea-cnes commented 4 years ago

The mobility observers are here to handle UTs mobility not satellite mobility.

Which file do you use from the example ? When you run it, is it without modifications or with the satellite mobility events ?

FizzaRaza97 commented 4 years ago

So I would need to implement mobility observer for satellite as well? I am using my own script that starts 2 tcp flows and schedules the mobility events.

pravenea-cnes commented 4 years ago

Yes, satellite mobility is not handled actually. Have you tried removing the mobility events from your script ? To check if the problem is linked to satellite mobility ?