RObust Header Compression (ROHC): A Profile for TCP/IP (ROHC-TCP)
RFC 6846
Document | Type |
RFC - Proposed Standard
(January 2013; Errata)
Obsoletes RFC 4996
Was draft-sandlund-rfc4996bis (individual in tsv area)
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Authors | Ghyslain Pelletier , Kristofer Sandlund , Mark West , Lars-Erik Jonsson | ||
Last updated | 2020-01-21 | ||
Stream | Internet Engineering Task Force (IETF) | ||
Formats | plain text html pdf htmlized (tools) htmlized with errata bibtex | ||
Reviews | |||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 6846 (Proposed Standard) | |
Action Holders |
(None)
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Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Wesley Eddy | ||
Send notices to | (None) |
Internet Engineering Task Force (IETF) G. Pelletier Request for Comments: 6846 InterDigital Communications Obsoletes: 4996 K. Sandlund Category: Standards Track Ericsson ISSN: 2070-1721 L-E. Jonsson M. West Siemens/Roke Manor January 2013 RObust Header Compression (ROHC): A Profile for TCP/IP (ROHC-TCP) Abstract This document specifies a RObust Header Compression (ROHC) profile for compression of TCP/IP packets. The profile, called ROHC-TCP, provides efficient and robust compression of TCP headers, including frequently used TCP options such as selective acknowledgments (SACKs) and Timestamps. ROHC-TCP works well when used over links with significant error rates and long round-trip times. For many bandwidth-limited links where header compression is essential, such characteristics are common. This specification obsoletes RFC 4996. It fixes a technical issue with the SACK compression and clarifies other compression methods used. Status of This Memo This is an Internet Standards Track document. This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available in Section 2 of RFC 5741. Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc6846. Pelletier, et al. Standards Track [Page 1] RFC 6846 ROHC-TCP January 2013 Copyright Notice Copyright (c) 2013 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Pelletier, et al. Standards Track [Page 2] RFC 6846 ROHC-TCP January 2013 Table of Contents 1. Introduction ....................................................5 2. Terminology .....................................................5 3. Background ......................................................7 3.1. Existing TCP/IP Header Compression Schemes .................7 3.2. Classification of TCP/IP Header Fields .....................8 4. Overview of the TCP/IP Profile (Informative) ...................10 4.1. General Concepts ..........................................10 4.2. Compressor and Decompressor Interactions ..................10 4.2.1. Compressor Operation ...............................10 4.2.2. Decompressor Feedback ..............................11 4.3. Packet Formats and Encoding Methods .......................11 4.3.1. Compressing TCP Options ............................11 4.3.2. Compressing Extension Headers ......................11 4.4. Expected Compression Ratios with ROHC-TCP .................12 5. Compressor and Decompressor Logic (Normative) ..................13 5.1. Context Initialization ....................................13 5.2. Compressor Operation ......................................13 5.2.1. Compression Logic ..................................13 5.2.1.1. Optimistic Approach .......................14 5.2.1.2. Periodic Context Refreshes ................14 5.2.2. Feedback Logic .....................................14 5.2.2.1. Optional Acknowledgments (ACKs) ...........14 5.2.2.2. Negative Acknowledgments (NACKs) ..........15 5.2.3. Context Replication ................................15 5.3. Decompressor Operation ....................................16 5.3.1. Decompressor States and Logic ......................16 5.3.1.1. Reconstruction and Verification ...........16 5.3.1.2. Detecting Context Damage ..................17Show full document text