LPWAN Static Context Header Compression (SCHC) and fragmentation for IPv6 and UDP
draft-ietf-lpwan-ipv6-static-context-hc-03
lpwan Working Group A. Minaburo
Internet-Draft Acklio
Intended status: Informational L. Toutain
Expires: November 6, 2017 IMT-Atlantique
C. Gomez
Universitat Politecnica de Catalunya
May 05, 2017
LPWAN Static Context Header Compression (SCHC) and fragmentation for
IPv6 and UDP
draft-ietf-lpwan-ipv6-static-context-hc-03
Abstract
This document describes a header compression scheme and fragmentation
functionality for IPv6/UDP protocols. These techniques are
especially tailored for LPWAN (Low Power Wide Area Network) networks
and could be extended to other protocol stacks.
The Static Context Header Compression (SCHC) offers a great level of
flexibility when processing the header fields. Static context means
that information stored in the context which, describes field values,
does not change during the packet transmission, avoiding complex
resynchronization mechanisms, incompatible with LPWAN
characteristics. In most of the cases, IPv6/UDP headers are reduced
to a small identifier.
This document describes the generic compression/decompression process
and applies it to IPv6/UDP headers. Similar mechanisms for other
protocols such as CoAP will be described in a separate document.
Moreover, this document specifies fragmentation and reassembly
mechanims for SCHC compressed packets exceeding the L2 pdu size and
for the case where the SCHC compression is not possible then the
IPv6/UDP packet is sent.
Status of This Memo
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Internet-Draft LPWAN SCHC May 2017
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This Internet-Draft will expire on November 6, 2017.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Vocabulary . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Static Context Header Compression . . . . . . . . . . . . . . 5
3.1. Rule ID . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2. Packet processing . . . . . . . . . . . . . . . . . . . . 7
4. Matching operators . . . . . . . . . . . . . . . . . . . . . 8
5. Compression Decompression Actions (CDA) . . . . . . . . . . . 9
5.1. not-sent CDA . . . . . . . . . . . . . . . . . . . . . . 10
5.2. value-sent CDA . . . . . . . . . . . . . . . . . . . . . 10
5.3. mapping-sent . . . . . . . . . . . . . . . . . . . . . . 10
5.4. LSB CDA . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.5. DEViid-DID, APPiid-DID CDA . . . . . . . . . . . . . . . 11
5.6. Compute-* . . . . . . . . . . . . . . . . . . . . . . . . 11
6. Application to IPv6 and UDP headers . . . . . . . . . . . . . 11
6.1. IPv6 version field . . . . . . . . . . . . . . . . . . . 11
6.2. IPv6 Traffic class field . . . . . . . . . . . . . . . . 12
6.3. Flow label field . . . . . . . . . . . . . . . . . . . . 12
6.4. Payload Length field . . . . . . . . . . . . . . . . . . 12
6.5. Next Header field . . . . . . . . . . . . . . . . . . . . 13
6.6. Hop Limit field . . . . . . . . . . . . . . . . . . . . . 13
6.7. IPv6 addresses fields . . . . . . . . . . . . . . . . . . 13
6.7.1. IPv6 source and destination prefixes . . . . . . . . 13
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