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Static Context Header Compression (SCHC) for the Constrained Application Protocol (CoAP)

Document Type Replaced Internet-Draft (individual)
Expired & archived
Authors Marco Tiloca , Laurent Toutain , Ivan Martinez , Ana Minaburo
Last updated 2023-10-23
Replaces draft-tiloca-lpwan-8824-update
Replaced by draft-ietf-schc-8824-update
RFC stream (None)
Intended RFC status (None)
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Replaced by draft-ietf-schc-8824-update
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


This document defines how to compress Constrained Application Protocol (CoAP) headers using the Static Context Header Compression and fragmentation (SCHC) framework. SCHC defines a header compression mechanism adapted for Constrained Devices. SCHC uses a static description of the header to reduce the header's redundancy and size. While RFC 8724 describes the SCHC compression and fragmentation framework, and its application for IPv6/UDP headers, this document applies SCHC to CoAP headers. The CoAP header structure differs from IPv6 and UDP, since CoAP uses a flexible header with a variable number of options, themselves of variable length. The CoAP message format is asymmetric: the request messages have a header format different from the format in the response messages. This specification gives guidance on applying SCHC to flexible headers and how to leverage the asymmetry for more efficient compression Rules. This document replaces and obsoletes RFC 8824.


Marco Tiloca
Laurent Toutain
Ivan Martinez
Ana Minaburo

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)