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Zero-byte Support for Bidirectional Reliable Mode (R-mode) in Extended Link-Layer Assisted RObust Header Compression (ROHC) Profile (RFC3408)

IP.com Disclosure Number: IPCOM000010295D
Original Publication Date: 2002-Dec-01
Included in the Prior Art Database: 2002-Dec-10
Document File: 8 page(s) / 15K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

Z. Liu: AUTHOR [+2]

Abstract

This document defines an additional mode of the link-layer assisted RObust Header Compression (ROHC) profile, also known as the zero-byte profile, beyond the two defined in RFC 3242. Zero-byte header compression exists in order to prevent the single-octet ROHC header from pushing a packet voice stream into the next higher fixed packet size for the radio. It is usable in certain widely deployed older air interfaces. This document adds the zero-byte operation for ROHC Bidirectional Reliable mode (R-mode) to the ones specified for Unidirectional (U-mode) and Bidirectional Optimistic (O-mode) modes of header compression in RFC 3242.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 19% of the total text.

Network Working Group                                             Z. Liu

Request for Comments: 3408                                         K. Le

Category: Standards Track                                          Nokia

                                                           December 2002

       Zero-byte Support for Bidirectional Reliable Mode (R-mode)

       in Extended Link-Layer Assisted RObust Header Compression

                             (ROHC) Profile

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 an additional mode of the link-layer assisted

   RObust Header Compression (ROHC) profile, also known as the zero-byte

   profile, beyond the two defined in RFC 3242.  Zero-byte header

   compression exists in order to prevent the single-octet ROHC header

   from pushing a packet voice stream into the next higher fixed packet

   size for the radio.  It is usable in certain widely deployed older

   air interfaces.  This document adds the zero-byte operation for ROHC

   Bidirectional Reliable mode (R-mode) to the ones specified for

   Unidirectional (U-mode) and Bidirectional Optimistic (O-mode) modes

   of header compression in RFC 3242.

1.  Introduction

   [RFC3242] defines a zero-byte solution for compression of IP/UDP/RTP

   packets only for Unidirectional (U-) and Bidirectional Optimistic

   (O-) modes [RFC3095].  The present specification extends the profile

   defined in [RFC3242] to provide zero-byte support for Bidirectional

   Reliable (R-) mode.  This specification and [RFC3242] allow a

   header-free packet format to be used in all modes to replace the

   majority of the 1-octet headers of ROHC RTP packets sent during

   normal operation.  Specifically, the compressor operating in R-mode

   is allowed to deliver a No-Header Packet (NHP) when [RFC3242] would

   have required it to deliver a ROHC Reliable Packet Type Zero (R-0)

   packet [RFC3095].

Liu & Le                    Standards Track                     [Page 1]

RFC 3408               0-byte Support for R-mode           December 2002

   For simplification, this profile is defined in the form of the

   additions and exceptions to [RFC3242] that are required to extend the

   RFC 3242 profile with zero-byte support for R-mode.  All terminol...