LPWAN Static Context Header Compression (SCHC) and fragmentation for IPv6 and UDP
draft-ietf-lpwan-ipv6-static-context-hc-05
lpwan Working Group A. Minaburo
Internet-Draft Acklio
Intended status: Informational L. Toutain
Expires: January 2, 2018 IMT-Atlantique
C. Gomez
Universitat Politecnica de Catalunya
July 01, 2017
LPWAN Static Context Header Compression (SCHC) and fragmentation for
IPv6 and UDP
draft-ietf-lpwan-ipv6-static-context-hc-05
Abstract
This document describes a header compression scheme and fragmentation
functionality for very low bandwidth networks. These techniques are
especially tailored for LPWAN (Low Power Wide Area Network) networks.
The Static Context Header Compression (SCHC) offers a great level of
flexibility when processing the header fields and must be used for
these kind of networks. A common context stored in a LPWAN device
and in the network is used. This context keeps information that will
not be transmitted in the constrained network. Static context means
that information stored in the context which describes field values,
does not change during packet transmission, avoiding complex
resynchronization mechanisms, incompatible with LPWAN
characteristics. In most of the cases, IPv6/UDP headers are reduced
to a small identifier called Rule ID. But sometimes the SCHC header
compression mechanisms will not be enough to send the compressed
packet in one L2 PDU, so the SCHC Fragmentation protocol must be used
when needed.
This document describes SCHC compression/decompression mechanism
framework and applies it to IPv6/UDP headers. Similar solutions for
other protocols such as CoAP will be described in separate documents.
Moreover, this document specifies fragmentation and reassembly
mechanim for SCHC compressed packets exceeding the L2 PDU size and
for the case where the SCHC compression is not possible then the
packet is sent using the fragmentation protocol.
Status of This Memo
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provisions of BCP 78 and BCP 79.
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Task Force (IETF). Note that other groups may also distribute
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Internet-Draft LPWAN SCHC July 2017
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. LPWAN Architecture . . . . . . . . . . . . . . . . . . . . . 4
3. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5
4. Static Context Header Compression . . . . . . . . . . . . . . 6
4.1. SCHC Rules . . . . . . . . . . . . . . . . . . . . . . . 7
4.2. Rule ID . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.3. Packet processing . . . . . . . . . . . . . . . . . . . . 9
5. Matching operators . . . . . . . . . . . . . . . . . . . . . 10
6. Compression Decompression Actions (CDA) . . . . . . . . . . . 11
6.1. not-sent CDA . . . . . . . . . . . . . . . . . . . . . . 12
6.2. value-sent CDA . . . . . . . . . . . . . . . . . . . . . 12
6.3. mapping-sent . . . . . . . . . . . . . . . . . . . . . . 12
6.4. LSB CDA . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.5. DEViid, APPiid CDA . . . . . . . . . . . . . . . . . . . 13
6.6. Compute-* . . . . . . . . . . . . . . . . . . . . . . . . 13
7. Application to IPv6 and UDP headers . . . . . . . . . . . . . 14
7.1. IPv6 version field . . . . . . . . . . . . . . . . . . . 14
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