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Status:

PROPOSED STANDARD

Authors:

A. Minaburo
L. Toutain
R. Andreasen

Stream:

IETF

Source:

lpwan (int)

Cite this RFC:TXT  | XML  |  BibTeX

DOI:  https://doi.org/10.17487/RFC8824

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Abstract

This document defines how to compress Constrained ApplicationProtocol (CoAP) headers using the Static Context Header Compressionand fragmentation (SCHC) framework. SCHC defines a header compressionmechanism adapted for Constrained Devices. SCHC uses a staticdescription of the header to reduce the header's redundancy and size.While RFC 8724 describes the SCHC compression and fragmentationframework, and its application for IPv6/UDP headers, this documentapplies SCHC to CoAP headers. The CoAP header structure differs fromIPv6 and UDP, since CoAP uses a flexible header with a variablenumber of options, themselves of variable length. The CoAP messageformat is asymmetric: the request messages have a header formatdifferent from the format in the response messages. Thisspecification gives guidance on applying SCHC to flexible headers andhow to leverage the asymmetry for more efficient compression Rules.

For the definition ofStatus,seeRFC 2026.

For the definition ofStream, seeRFC 8729.