Veins - Disable channel hopping in IEEE 802.11p. Is it realistic?

[Guilherme Maia]

Hi,

I have just read the article On the Necessity of Accurate IEEE 802.11p Models for IVC Protocol Simulation in which the authors discuss "when it is okay to simulate IVC with a different model than WAVE". In summary, they show that by increasing the channel load, the performance of applications varies greatly when using different IEEE 802.11 MAC layer models, thus highlighting the importance of performing simulations with a proper IEEE 802.11p model with channel hopping. However, in some of my simulations using Veins, I sometimes disable the channel hopping functionality, i.e., in my .ini configuration file I set:

**.nic.mac1609_4.useServiceChannel = false

Therefore, how close to reality are my simulations when I disable channel hopping? Which scenarios is it ok to disable it? Sparse scenarios, as discussed in the paper above? Why Veins gives the option to disable it?

Thanks,

Guilherme 

[Thomas Paulin]

Hi Guilherme,

Which scenarios are you considering? Because if you expect your applications to work with WAVE, that would be very few, as this has a significant impact on performance. For one the bandwidth is more than halved, all depending on the channel switching approach used. I would suggest that read up on why WAVE has both a service channel and control channel, which would answer your question. 

Cheers,

Thomas

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[Christoph Sommer]

Hi Guilherme,

Guilherme Maia wrote:
> disable channel hopping? [...] Why Veins gives the option to disable it?

The current version of WAVE mandates channel hopping, but someone might
want to use the WAVE lower layer modules as a basis for "upper layers"
building on IEEE 802.11p that don't (such as custom ones or ETSI ITS-G5).


Best,

Christoph

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Dr.-Ing. Christoph Sommer
Institute of Computer Science
University of Innsbruck, Austria
Phone: +43 512 507-53285 / Fax: -53079
http://ccs.uibk.ac.at/~sommer/

[Guilherme Maia]

Thank you.

Cheers,

Guilherme

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