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2.4 GHz and 5 GHz: same delay and throughput!

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Vineet Gokhale

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Apr 20, 2020, 4:07:30 AM4/20/20
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Hello,

I have been experimenting with WLAN to get an idea of the latency and throughput in 2.4GHz and 5GHz frequency bands of 802.11n in infrastructure mode.
The sources are wirelessly connected to the AP and the destinations are connected to the AP via Ethernet links (100Gbps bandwidth and 0.1ns propagation latency).
I am using UDP traffic for measuring the E2E delay and TCP for throughput. I have attached the NED and INI files used for this experiment.
Below are the measurements in the two frequency band

Screenshot from 2020-04-20 10-00-46.png






Surprisingly, 5 GHz yields no performance improvement over 2.4 GHz. 

Am I missing something here? Any leads in this regard are highly appreciated.

Thanks in advance,
Vineet


  
Lan80211n.ned
omnetpp.ini

Alfonso Ariza Quintana

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Apr 20, 2020, 4:19:48 AM4/20/20
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At the same bit rate, the difference between 2.4 or 5 is the attenuation in function of the distance, if the nodes are in range, the results should be the same, if the distance is in the limit, the performance at 2.4 should be a bit better.
De: omn...@googlegroups.com <omn...@googlegroups.com> en nombre de Vineet Gokhale <vinee...@gmail.com>
Enviado: lunes, 20 de abril de 2020 10:07
Para: OMNeT++ Users <omn...@googlegroups.com>
Asunto: [Omnetpp-l] 2.4 GHz and 5 GHz: same delay and throughput!
 
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Vineet Gokhale

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Apr 20, 2020, 5:01:23 AM4/20/20
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After reading your comment, I understood that the command that sets the MAC bitrate (**.wlan*.mac.dataBitrate = 130Mbps) should be commented in order to showcase the latency and throughput improvement of 5 GHz. Even after doing this, the measurements are the same as shown previously. 

What is the right way to showcase the latency and throughput improvement of 5 GHz over 2.4 GHz?

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Alfonso Ariza Quintana

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Apr 20, 2020, 5:10:08 AM4/20/20
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Check the bit rate, I suspect that the bit rate is the same
Enviado: lunes, 20 de abril de 2020 11:01
Para: omn...@googlegroups.com <omn...@googlegroups.com>
Asunto: Re: [Omnetpp-l] 2.4 GHz and 5 GHz: same delay and throughput!
 

Vineet Gokhale

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Apr 20, 2020, 5:40:48 AM4/20/20
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I am not explicitly setting the bitrate in my code. All bitrates default to -1 bps. Shouldn't this suffice?
Is there anything else that I should be checking? 

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Alfonso Ariza Quintana

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Apr 20, 2020, 6:53:37 AM4/20/20
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If you don’t set it, it will chose the default value that is the same in both cases, in this case, the only diference is the coverage area

 

Enviado desde Correo para Windows 10

 

Enviado: Monday, April 20, 2020 11:40:26 AM
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