[e2e] Is a non-TCP solution dead?

[Adam Wolisz]

Dave,
your statement is correct AS FOR TODAY!

One of the most promissing directions in wireless communications
goes exactly th eother way!

The wireless communications community is actively considering
schemata, where packets pretty close in the time domain,
would be routed in a dynamic way, acording to the short-term
propagation conditions, via different paths. Probably not 20 ,
but 2-5 are definitely being considered.

This is one of the most promissing way to increase the
capacity, and improve the quality of service.

You are right: We do not have much experience with such
systems so far, we have to elaborate the proper understanding!

Adam


davide+e2e at cs.cmu.edu wrote:

> > However, if you want to discuss the space of potential RF
> > communications networks, you have to stop thinking about
> > "links".   Start with the Slepian-Wolf theorem [...]
> > Wireless means there are "no wires".  Not even "virtual
> > wires".
>
> But there *are* "associations", aren't there?  If nothing else, a
> transmitter needs to have reasonable confidence that at least one
> receiver will be listening with a "close enough" tuple of (frequency
> range, modulation method, clock rate, antenna orientation), right?
>
> Don't practical system designs involve medium-sized association
> sets per wireless node, i.e., not zero, one, or one million?  If
> at any given time there are 17 stations with which you are reasonably
> synchronized and 17,000,000 with which you aren't, is that conceptually
> so far away from 17 links?  Don't CPU requirements practically
> limit you to a medium-sized number of simultaneously synchronized
> partners?
>
> Or, put another way, if one end-system sends 20 related packets
> "in close succession" to another end-system 5 miles away, isn't it
> pretty likely that most of those 20 packets will traverse the same
> sequence of nodes?  Do we have any experience with architectures
> where each of the 20 packets traverses a *different* sequence of
> nodes?  Would there be much hope of the transmitting end-system
> pacing packets along those 20 independent paths in a reasonable
> way?
>
> Dave Eckhardt
-------------- next part --------------
A non-text attachment was scrubbed...
Name: wolisz.vcf
Type: text/x-vcard
Size: 744 bytes
Desc: Card for Adam Wolisz
Url : http://www.postel.org/pipermail/end2end-interest/attachments/20030331/1f27031e/wolisz.vcf