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RObust Header Compression (ROHC): Requirements and Assumptions for 0-byte IP/UDP/RTP Compression (RFC3243)

IP.com Disclosure Number: IPCOM000007882D
Original Publication Date: 2002-Apr-01
Included in the Prior Art Database: 2002-May-02
Document File: 7 page(s) / 12K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

L-E. Jonsson: AUTHOR

Abstract

This document contains requirements for the 0-byte IP/UDP/RTP (Internet Protocol/User Datagram Protocol/Real-Time Transport Protocol) header compression scheme to be developed by the Robust Header Compression (ROHC) Working Group. It also includes the basic assumptions for the typical link layers over which 0-byte compression may be implemented, and assumptions about its usage in general.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 27% of the total text.

Network Working Group                                       L-E. Jonsson

Request for Comments: 3243                                      Ericsson

Category: Informational                                       April 2002

                   RObust Header Compression (ROHC):

    Requirements and Assumptions for 0-byte IP/UDP/RTP Compression

Status of this Memo

   This memo provides information for the Internet community.  It does

   not specify an Internet standard of any kind.  Distribution of this

   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2002).  All Rights Reserved.

Abstract

   This document contains requirements for the 0-byte IP/UDP/RTP

   (Internet Protocol/User Datagram Protocol/Real-Time Transport

   Protocol) header compression scheme to be developed by the Robust

   Header Compression (ROHC) Working Group.  It also includes the basic

   assumptions for the typical link layers over which 0-byte compression

   may be implemented, and assumptions about its usage in general.

1.  Introduction

   The goal of the Robust Header Compression (ROHC) Working Group is to

   develop header compression schemes that perform well over links with

   high error rates and long link roundtrip times.  The schemes must

   perform well for cellular links, using technologies such as WCDMA,

   EDGE, and CDMA-2000.  However, the schemes should also be applicable

   to other future link technologies with high loss and long roundtrip

   times.

   ROHC RTP has become a very efficient, robust and capable compression

   scheme, able to compress the IP/UDP/RTP headers down to a total size

   of only one octet.  This makes ROHC RTP an excellent solution for

   future cellular environments with new air interfaces, such as WCDMA,

   making even speech services possible over IP with an insignificantly

   lower spectrum efficiency compared to existing circuit switched

   solutions.

Jonsson                      Informational                      [Page 1]

RFC 3243        Reqs and Assumptions for 0-byte ROHC RTP      April 2002

   However, all-IP cellular networks will also be built with already

   existing air interfaces such as GSM and IS-95, which are less

   flexible using radio bearers optimized for specific frame sizes

   matching the speech codecs used.  This means that not a single octet

   of header can be added without switching to the next higher fixed

   packet size supported by the link, something which is obviously very

   costly.  In the long term, this drawback should of course be

   eliminated with new, more flexible air interfaces, but in the short

   term it would be desirable if an efficiency comparable to the circuit

   switched case could also be achieved for already deployed speech

   codecs when used over the existing air interfaces.  To achieve that,

   it must be possible to completely eliminate the headers for a

   majority of the packets during normal operation, and this is the

   purpose of 0-byte header compression.  All functionality normally

   provided by the 1-octet header must then be provided by some other

   means, typically by utilizing functionality from the lower layer.  It

   is important to remember that the purpose of 0-byte header

   compression is to provide optimal efficiency for applications

   matching the link layer ch...