This document defines the Static Context Header Compression (SCHC)
framework, which provides both a header compression mechanism and an
optional fragmentation mechanism. SCHC has been designed for Low Power
Wide Area Networks (LPWAN). SCHC compression is based on a common
static context stored both in the LPWAN device and in the network
infrastructure side. This document defines a generic header
compression mechanism and its application to compress IPv6/UDP
headers. This document also specifies an optional fragmentation and
reassembly mechanism. It can be used to support the IPv6 MTU
requirement over the LPWAN technologies. Fragmentation is needed for
IPv6 datagrams that, after SCHC compression or when such compression
was not possible, still exceed the layer-2 maximum payload size. The
SCHC header compression and fragmentation mechanisms are independent
of the specific LPWAN technology over which they are used. This
document defines generic functionalities and offers flexibility with
regard to parameter settings and mechanism choices. This document
standardizes the exchange over the LPWAN between two SCHC entities.
Settings and choices specific to a technology or a product are
expected to be grouped into profiles, which are specified in other
documents. Data models for the context and profiles are out of scope.
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