Fw: I-D ACTION:draft-degermark-crtp-cellular-01.txt,.ps

["Lars-Erik Jonsson" <lars-erik.jonsson@ericsson.com>]

>A New Internet-Draft is available from the on-line Internet-Drafts directories.
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>
> Title : CRTP over cellular radio links
> Author(s) : M. Degermark, H. Hannu, L. Jonsson, K. Svanbro
> Filename : draft-degermark-crtp-cellular-01.txt,.ps
> Pages : 22
> Date : 14-Dec-99
> 
>This document evaluates the performance of a header compression
>protocol for RTP, CRTP [RFC-2509], over links built on cellular radio
>access technology. The key characteristics affecting CRTP performance
>over such links are the high error rates and the relatively long
>roundtrip time over the link.
>Bandwidth is typically expensive in cellular radio access networks,
>saving a single octet per voice packet can be equivalent to saving
>many billion dollars in deployment since fewer base-stations are
>needed. This is beneficial for operators as well as end-users who can
>get cheaper wireless IP telephony service.
>CRTP performance is evaluated for two kinds of link layers operating
>over a realistic radio channel with high bit-error rates. Two main
>conclusions are drawn. The first is that CRTP does not perform well
>for this type of link. The second is that in high-error environments
>it is very beneficial to have a checksum covering the compressed
>header only, not the payload, so that the decompressor sees all non-
>damaged headers. When a strong checksum covers the entire link layer
>frame, header compression performs badly since too many headers are
>discarded due to damaged payloads.
>
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