Robust Header Compression BOF (robhc) Tuesday, November 9 at 1545-1800 ================================ CHAIR: Mikael Degermark DESCRIPTION: The cellular community is now standardizing the next generation cellular systems. These systems will use IP to deliver telephony to coming mobile phones, to allow end-to-end IP telephony. As cellular bandwith is expensive, radio spectrum efficiency is of outmost importance and thus the IP/UDP/RTP headers must be compressed over the air. 3GPP has specified the requirements for the needed header compression scheme and it has been shown that no current header compression scheme in the IETF can satisfy these requirements. CRTP [RFC-2508] is the closest candidate but is not sufficiently robust against errors on the link, i.e., CRTP cannot deliver acceptable performance at the anticipated error rates. It is likely that the number of users of cellular IP telephony will be larger than the current number of people using TCP/IP, therefore it is important that a suitable header compression scheme is developed. The BOF will outline the relevant properties of the cellular links, the requirements, and will explain why CRTP fails. One or more proposals for a suitable header compression scheme will be presented, and finally we will discuss if and how the IETF will work on standardizing a suitable header compression scheme. AGENDA: 0. Introduction Mikael Degermark 1. 3GPP timeline Krister Svanbro (?) 2. 3GPP requirements on robust header compression. TBA, will get a provider to do this draft-degermark-hc-requirements-00.txt 3. Why CRTP is not good enough Mikael Degermark draft-degermark-crtp-eval-00.{ps,txt} 4. Cellular link properties affecting header compression - delays, error rates & error distributions for EDGE, WCDMA, GSM, etc. Hans Hannu (?) 5. Header stripping TBA, Nokia. 6. RObust Checksum-based header COmpression - ROCCO Lars-Erik Jonsson, Ericsson draft-jonsson-robust-hc-02.{ps,txt} 7. How do we continue? Should the IETF do this? New WG? AVT? Mikael Degermark