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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.

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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...