RFC 3242 (rfc3242) - Page 1 of 21

RObust Header Compression (ROHC): A Link-Layer Assisted Profile for IP/UDP/RTP

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Network Working Group                                       L-E. Jonsson
Request for Comments: 3242                                  G. Pelletier
Category: Standards Track                                       Ericsson
                                                              April 2002


                   RObust Header Compression (ROHC):
              A Link-Layer Assisted Profile for IP/UDP/RTP

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

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

Abstract

   This document defines a ROHC (Robust Header Compression) profile for
   compression of IP/UDP/RTP (Internet Protocol/User Datagram
   Protocol/Real-Time Transport Protocol) packets, utilizing
   functionality provided by the lower layers to increase compression
   efficiency by completely eliminating the header for most packets
   during optimal operation.  The profile is built as an extension to
   the ROHC RTP profile.  It defines additional mechanisms needed in
   ROHC, states requirements on the assisting layer to guarantee
   transparency, and specifies general logic for compression and
   decompression making use of this header-free packet.

Table of Contents

   1.  Introduction....................................................2
   2.  Terminology.....................................................4
   3.  Overview of the Link-Layer Assisted Profile.....................5
        3.1.  Providing Packet Type Identification.....................6
        3.2.  Replacing the Sequence Number............................6
        3.3.  CRC Replacement..........................................7
        3.4.  Applicability of This Profile............................7
   4.  Additions and Exceptions Compared to ROHC RTP...................8
        4.1.  Additional Packet Types..................................8
               4.1.1.  No-Header Packet (NHP)..........................8
               4.1.2.  Context Synchronization Packet (CSP)............8
               4.1.3.  Context Check Packet (CCP)......................9



Jonsson, et. al             Standards Track
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