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Re: [manet] Frequency of operation of MANET's!

Dear Dr. Buddenberg,
 
Sorry for the delay in reply. Thank you for your answer.
 
I would like to evaluate the voice-call carrying capacity of the MANET. I would also try to compare the performance of the Ad Hoc network employing different physical layers available in IEEE 802.11b standard like: FHSS at 2.4 GHz, DSSS at 2.4GHz and OFDM at 5 GHz and IEEE 802.11a and if possible IEEE 802.16 standard also.
This is the whole idea that i want to work on and i have to only simulate these because i do not have the test bed setup available for me to work on. Can you please advice me on how i can proceed. Like i do not know if it will make more sense to make use of ns-2 simulator for this or any other simulator or write a C program code and execute. Experts please send me your comments and suggestions at your earliest.
 
Thanks in advance.


Rex Buddenberg <budden at nps.navy.mil> wrote:
On Tue, 2004-08-31 at 18:30, Raja Sombhotla wrote:
> Hi All,
>
> I would like to know if the lincense-free ISM bands around 2.4GHz and
> 5 GHz are the only possible frequencies of operation for the Ad-Hoc
> mobile networks or can they be operated at other frequencies also? And
> also which frequency is being used in military operations and
> emergency rescue?
>
Is your question a spectrum allocation one or a protocol one?

>From the point of view of protocols, the layer 2 protocols are entirely
frequency independent (this is true of both 802.11 and 802.16). It's
entirely possible to host a different PHY layer (which includes
different spectrum, different modulation, etc) under the MAC. Indeed,
in our inquiries of using 802.16 protocols for military use, one of the
things we need is ability to support different PHY.
802.16, at this point in time, has one MAC specification and five
different PHY specs. So the modularity is there.


The ISM spectrum allocations are a function of the FCC in the United
States. The questions usually revolve around frequency reuse and
controlling interference. In the past, the FCC tended to allocate
spectrum by function -- one band for emergency, one band for taxis, one
band for military, etc. That's changing because the ambulances, taxis
and military all went out and bought the same radios!


> This might be a naive question but please do let me know this
> accuarately at your earliest.
>
> Thanks and regards.
>
>
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b


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