We would like to bring our findings related to improving TCP
performance over CDMA2000 1x (a.k.a., 1XRTT) networks
to the attention of this forum. Our results are based on simulations
and lab measurements for FTP sessions.
We believe that our results are generally applicable to W-CDMA and,
possibly, GPRS networks as well.
However, since we didn't simulate those networks, we can't claim
that with absolute certainty.
Our hope is that the discussions on this email list will help to
better identify
TCP performance improvement techniques which are applicable to all
3G wireless data networks.
Our view on 3g wireless links is that three factors make them
different from other links:
- 3g wireless links are links with Errors (rfc3155 covers that part)
- 3g wireless links experience (some) bandwidth asymmetry (asymmetry
ID covers that part)
- 3g wireless links experience "bandwidth oscillation" (see below)
In some cases bandwidth oscillation proved to be the most
significant single factor
causing throughput degradation. (For more details please see the
document).
We believe that effects of bandwidth oscillation will have to be
addressed
in 3G wireless data ID because they will be present in any system
which does
scheduling of RF resources.
We put our observations/recommendations in a document which was
submitted
to IETF last week and can be accessed at
http://www.geocities.com/tsg_p/draft-khafizov-pilc-cdma2000-00.txt
We apologize for some typos left in the document.
--Farid
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