CRTP over cellular radio links
draft-degermark-crtp-cellular-01

Document Type Expired Internet-Draft (individual)
Last updated 1999-12-14
Stream (None)
Intended RFC status (None)
Formats
Expired & archived
plain text pdf html bibtex
Stream Stream state (No stream defined)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
Telechat date
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at
https://www.ietf.org/archive/id/draft-degermark-crtp-cellular-01.txt

Abstract

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.

Authors

Hans Hannu (hans.hannu@lu.erisoft.se)
Lars-Erik Jonsson (lars-erik@lejonsson.com)
Krister Svanbro (krister.svanbro@lu.erisoft.se)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)