Static Context Header Compression (SCHC) over LoRaWAN
draft-ietf-lpwan-schc-over-lorawan-14
lpwan Working Group O. Gimenez, Ed.
Internet-Draft Semtech
Intended status: Standards Track I. Petrov, Ed.
Expires: July 29, 2021 Acklio
January 25, 2021
Static Context Header Compression (SCHC) over LoRaWAN
draft-ietf-lpwan-schc-over-lorawan-14
Abstract
The Static Context Header Compression (SCHC) specification describes
generic header compression and fragmentation techniques for Low Power
Wide Area Networks (LPWAN) technologies. SCHC is a generic mechanism
designed for great flexibility so that it can be adapted for any of
the LPWAN technologies.
This document specifies a profile of RFC8724 to use SCHC in
LoRaWAN(R) networks, and provides elements such as efficient
parameterization and modes of operation.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Static Context Header Compression Overview . . . . . . . . . 4
4. LoRaWAN Architecture . . . . . . . . . . . . . . . . . . . . 6
4.1. Device classes (A, B, C) and interactions . . . . . . . . 7
4.2. Device addressing . . . . . . . . . . . . . . . . . . . . 8
4.3. General Frame Types . . . . . . . . . . . . . . . . . . . 8
4.4. LoRaWAN MAC Frames . . . . . . . . . . . . . . . . . . . 9
4.5. LoRaWAN FPort . . . . . . . . . . . . . . . . . . . . . . 9
4.6. LoRaWAN empty frame . . . . . . . . . . . . . . . . . . . 9
4.7. Unicast and multicast technology . . . . . . . . . . . . 9
5. SCHC-over-LoRaWAN . . . . . . . . . . . . . . . . . . . . . . 10
5.1. LoRaWAN FPort and RuleID . . . . . . . . . . . . . . . . 10
5.2. Rule ID management . . . . . . . . . . . . . . . . . . . 10
5.3. Interface IDentifier (IID) computation . . . . . . . . . 11
5.4. Padding . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.5. Decompression . . . . . . . . . . . . . . . . . . . . . . 12
5.6. Fragmentation . . . . . . . . . . . . . . . . . . . . . . 13
5.6.1. DTag . . . . . . . . . . . . . . . . . . . . . . . . 13
5.6.2. Uplink fragmentation: From device to SCHC gateway . . 13
5.6.3. Downlink fragmentation: From SCHC gateway to device . 17
5.7. SCHC Fragment Format . . . . . . . . . . . . . . . . . . 20
5.7.1. All-0 SCHC fragment . . . . . . . . . . . . . . . . . 20
5.7.2. All-1 SCHC fragment . . . . . . . . . . . . . . . . . 21
5.7.3. Delay after each LoRaWAN frame to respect local
regulation . . . . . . . . . . . . . . . . . . . . . 21
6. Security Considerations . . . . . . . . . . . . . . . . . . . 21
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 21
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 21
Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . 21
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 22
10.1. Normative References . . . . . . . . . . . . . . . . . . 22
10.2. Informative References . . . . . . . . . . . . . . . . . 23
10.3. URIs . . . . . . . . . . . . . . . . . . . . . . . . . . 23
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