RE: [manet] Wi Max?

["Carlos H. Rentel" <[e-mail]>]

Hello,

In my humble opinion though to say MANET is a layer 3 issue is mainly over
simplistic. IEEE 802.11 ("WiFi") or 802.16 (ver. a adapts better to the concept
of MANET, although more accurately speaking is a mesh concept) can not be the
ultimate (particullarly MAC) approach. MANETs is an *all layer* issue (and I am
not necessarily referring to cross-layer design :) ).

Best Regards,

Carlos Rentel



Quoting Rex Buddenberg <[e-mail]>:

> Parag,
>
> Giorgio is right.  MANET is a layer 3 issue and both WiFi and WiMax are
> layer 1-2 technologies.
>
> That said ...  Most experimental MANET stuff needs some kind of plumbing
> underneath and WiFi (IEEE 802.11) has been popular for that.  And a lot
> of the experimentation has been done in 'ad hoc' or 'infrastructureless'
> mode where two subscriber nodes can connect with each other.  In short,
> WiFi can be pretty promiscuous which happens to fit the MANET
> intentions.  And it's d.c. -- dirt cheap.
>
> Wi-MAX (IEEE 802.16) changes the MAC algorithm from a carrier sense one
> used in WiFi (and it's antecedent, wired ethernet) to a scheduling
> algorithm.  Scheduling MACs rely only on the assumption that everyone
> can hear the base station (BS); there's no requirement whatever that
> peers (SSs) hear each other so the hidden node problem goes away (so in
> v1, SS-to-SS is not well supported).  Many satellite comms algorithms
> (e.g. DAMA) fall in this general category, but are anemic by comparison
> to .16.  Scheduling MACs can also provide stability under overload /
> oversubscription, bandwidth efficiency, and ability to control QoS to
> the extent that we can provide deterministic service at layer 2 ... all
> of which are important in many situations.  ... but don't have much to
> do with MANET.
> 	What 802.16 does not do well yet is the Wi-Fi ad hoc mode.  We may have
> to modify this statement soon as real compliant products start appearing
> in the marketplace (the 802.16-2004 standard was ratified in June and
> that seems to have uncorked a lot of development).  There are two
> developments in IEEE 802 that are germane here:
> 	1) there is 'mesh' work going on within 802.16 but it's acknowledged as
> not being mature in the -2004 version.
> 	2) bit of bureaucratic dispute between 802.16, 802.20 and 802.22 about
> the terms 'fixed' and 'mobile' in the PARs (charters).  All three
> committees (.20 and .22 are much less mature) have both MAC and PHY
> development in their charter docs.  But it's not at all clear why either
> .20 or .22 need to develop a new MAC -- a little growth and maturity in
> the .16 MAC may be all that's needed.... but the 802.16 PAR has the term
> 'fixed' in it.  These two committees do indeed need to develop new PHY
> standards for their particular purposes (cellphone --> packet switch and
> TV spectrum reuse for rural, respectively).
>
> Wi-MAX is going to be interesting in the next few years.  At least some
> in the industry are planning to put Wi-Max chipsets in your laptop like
> Wi-Fi ones are now.  The shift from infrastructureless to a more
> hierarchical layer 2 structure does change some of the MANET tacit
> assumptions.
>
> Help?
>
>
> On Wed, 2004-10-27 at 02:36, Giorgio Mulas wrote:
> > Dear Parag,
> > WiFi is a Layer 1 and 2 technology and it is not related with routing
> > issues.
> > Ad hoc networking is a research topic considering routing issues (and,
> > of course, other important things)
> >
> > The main relation between WiFi and Ad hoc networks is that cheap
> > WiFi-enabled devices are usually used to build up testbeds for
> > MANETs...
> >
> > BR.
> >
> > Giorgio
> >
> >
> >
> >
> >         -----Original Message-----
> >         From: [e-mail] [mailto:[e-mail]]
> >         On Behalf Of Parag Goswami
> >         Sent: mercoledì 27 ottobre 2004 10.45
> >         To: [e-mail]
> >         Subject: [manet] Wi Max?
> >
> >
> >         Dear All,
> >         If anybody tells me the major differences between Ad hoc
> >         networking and WiFi.
> >         As we know both are used for the communication between mobile
> >         nodes.Or is it the case that WiFi is also a part of Ad Hoc
> >         networking ?
> >
> >         Best Regards,
> >         Parag Goswami
> >         http://www.geocities.com/paragboom2k
> >
> >
> >         ______________________________________________________________
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> >
> >
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>
> b
>
>
>
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