RFC 3409 (rfc3409) - Page 1 of 11

Lower Layer Guidelines for Robust RTP/UDP/IP Header Compression

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Network Working Group                                         K. Svanbro
Request for Comments: 3409                                      Ericsson
Category: Informational                                    December 2002


    Lower Layer Guidelines for Robust RTP/UDP/IP Header 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 describes lower layer guidelines for robust header
   compression (ROHC) and the requirements ROHC puts on lower layers.
   The purpose of this document is to support the incorporation of
   robust header compression algorithms, as specified in the ROHC
   working group, into different systems such as those specified by
   Third Generation Partnership Project (3GPP), 3GPP Project 2 (3GPP2),
   European Technical Standards Institute (ETSI), etc.  This document
   covers only lower layer guidelines for compression of RTP/UDP/IP and
   UDP/IP headers as specified in [RFC 3095].  Both general guidelines
   and guidelines specific for cellular systems are discussed in this
   document.

Table of Contents

   1.  Introduction.................................................. 2
   2.  General guidelines............................................ 2
         2.1.  Error detection....................................... 2
         2.2.  Inferred header field information..................... 3
         2.3.  Handling of header size variation..................... 3
         2.4.  Negotiation of header compression parameters.......... 5
         2.5.  Demultiplexing of flows onto logical channels......... 5
         2.6.  Packet type identification............................ 5
         2.7.  Packet duplication.................................... 6
         2.8.  Packet reordering..................................... 6
         2.9.  Feedback packets...................................... 6
   3.  Cellular system specific guidelines........................... 7
         3.1.  Handover procedures................................... 7
         3.2.  Unequal error detection (UED)......................... 8
         3.3.  Unequal error protection (UEP)........................ 9



Svanbro                      Informational
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