UDP throughput calculation in INET

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Foroutan Fami

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Mar 17, 2021, 12:53:04 AM3/17/21
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This might sounds silly but I was wondering how these speeds have been calculated in the INET wireless QoS showcase:

#-----background - 24Mbps
*.sta*.app[0].messageLength = 900B
*.sta*.app[0].sendInterval = normal(300us,10us)
#-----best effort - 28.8Mbps
*.sta*.app[1].messageLength = 900B
*.sta*.app[1].sendInterval = normal(250us,10us)
#-----video - 5Mbps
*.sta*.app[2].messageLength = 600B
*.sta*.app[2].sendInterval = normal(1ms,10us)
#-----voice - 100kbps
*.sta*.app[3].messageLength = 125B
*.sta*.app[3].sendInterval = normal(10ms,10us)

Any reference or documentation is highly appreciated.
Thanks.

V Balasubramanian

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Mar 17, 2021, 2:44:25 AM3/17/21
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+1
I wasn't able to find a documentation for this.

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Foroutan Fami

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Mar 18, 2021, 6:42:50 PM3/18/21
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Alfonso do you any idea?

Alfonso Ariza Quintana

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Mar 19, 2021, 5:16:45 AM3/19/21
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I don't understand your question.
If it is the bit rate
900B * 8 / 300us = 24 Mb/s

Size in bytes * 8 (bits in a byte) / mean time between two packets = binary bit rate
De: omn...@googlegroups.com <omn...@googlegroups.com> en nombre de Foroutan Fami <forout...@gmail.com>
Enviado: jueves, 18 de marzo de 2021 23:42
Para: OMNeT++ Users <omn...@googlegroups.com>
Asunto: Re: [Omnetpp-l] UDP throughput calculation in INET
 

Foroutan Fami

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Mar 29, 2021, 1:55:09 PM3/29/21
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I was wondering how they come up with these values? Why " 900B * 8 / 300us = 24 Mb/s "  is there any reference? why not 100us or a different message length?
Or is there any reference for other types?

FEIT

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Sep 19, 2021, 5:11:52 AM9/19/21
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Hello Alfonso, following the above formula, if i compute the bit rate considering the parameters of sensornetwork>>omnetpp.ini,  (message length 10Byte and sendInterval = 0.5s) the bit rate = 10*8/0.5 = 160 bps.
Would you please say then why the bit rate parameter is set as 19200 bps in the same ini file?
**.radio.transmitter.bitrate = 19200 bps

Thank you.

Alfonso Ariza Quintana

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Sep 20, 2021, 3:57:07 AM9/20/21
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The offered traffic at the application layer, yes, but, for example, UDP includes a header of 8 bytes, and IPv4 20,
Every packet that you are sending of 10 bytes is in reality 38 bytes when this packet arrives at the link layer, now you need to include the link-layer header.

If you are generating a packet of 10 bytes every 0.5 seconds, you are injecting in reality, at least 38*8/0.5 = 608b/s
you can increase the size of the packet or increase the packet frequency to increase the bit rate. If you reduce the time between packets to 0.1 second you are generating 38*8/0.1  = 3040 b/s

De: omn...@googlegroups.com <omn...@googlegroups.com> en nombre de FEIT <fei...@gmail.com>
Enviado: domingo, 19 de septiembre de 2021 11:11

Mourad Ouhammou

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Sep 20, 2021, 3:43:58 PM9/20/21
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hello please can i use EDCA in this scenarios and how ;
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FEIT

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Sep 20, 2021, 8:42:29 PM9/20/21
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Hello Alfonso, would you please say why the bitrate is set to 19200 bps then? Is 19200 bps the maximum bit rate the network can handle?
**.radio.transmitter.bitrate = 19200 bps

Many thanks for your explanation.

Alfonso Ariza Quintana

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Sep 21, 2021, 4:11:22 AM9/21/21
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It depends on the radio, if you are using Wi-Fi, the bit rate is set using the standard and you only can use the bit rate in the standards, and this is the peak radio bit rate. The real bit rate is lower, for example, for 802.11g the peak bit rate is 54Mb/s the effective bit rate if more or less 20Mb/s. Depending on the protocol and the header overhead, it can be different.


Enviado: martes, 21 de septiembre de 2021 2:42

FEIT

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Sep 21, 2021, 6:56:12 AM9/21/21
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Thank you Alfonso. So, this is the peak bit rate for APSKScalarRadio? Can you please refer me any documentation where I can get the details of the standard, so I can understand why it is set to 19200 bps? Thank you again.

Alfonso Ariza Quintana

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Sep 22, 2021, 4:20:27 AM9/22/21
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If you are using wifi, the bit rate is selected from the available bit rate, in the case of other types of radio, it is the peak bit rate of the ratio. If you include a CSMA protocol, ACK, overhead ... the effective bit rate for upper layers is lower, sometimes less than half, even lower with protocols like X-MAC, B-MAC
Enviado: martes, 21 de septiembre de 2021 12:56

FEIT

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Sep 24, 2021, 7:10:56 AM9/24/21
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Hello Alfonso,

Many thanks for your explanation.

Is it possible to evaluate X-MAC or B-MAC performance considering mixed traffic loads (similar to QoS showcase)?

If yes, do I need to focus on omnetpp.ini file only or I also have to modify cc file?

Thank you.

Alfonso Ariza Quintana

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Sep 28, 2021, 6:07:05 AM9/28/21
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You can, but X-MAC and B-MAC are designed for a very low consumption idea, basically for sensor networks, and the traffic that this type of protocol can support is quite low,
Enviado: viernes, 24 de septiembre de 2021 13:10
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