Static Context Header Compression (SCHC) over LoRaWAN
draft-ietf-lpwan-schc-over-lorawan-08
lpwan Working Group O. Gimenez, Ed.
Internet-Draft Semtech
Intended status: Informational I. Petrov, Ed.
Expires: January 13, 2021 Acklio
July 12, 2020
Static Context Header Compression (SCHC) over LoRaWAN
draft-ietf-lpwan-schc-over-lorawan-08
Abstract
The Static Context Header Compression (SCHC) specification describes
generic header compression and fragmentation techniques for LPWAN
(Low Power Wide Area Networks) technologies. SCHC is a generic
mechanism designed for great flexibility so that it can be adapted
for any of the LPWAN technologies.
This document provides the adaptation of SCHC for use in LoRaWAN
networks, and provides elements such as efficient parameterization
and modes of operation. This is called a profile.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Static Context Header Compression Overview . . . . . . . . . 4
4. LoRaWAN Architecture . . . . . . . . . . . . . . . . . . . . 5
4.1. Device classes (A, B, C) and interactions . . . . . . . . 6
4.2. Device addressing . . . . . . . . . . . . . . . . . . . . 7
4.3. General Frame Types . . . . . . . . . . . . . . . . . . . 7
4.4. LoRaWAN MAC Frames . . . . . . . . . . . . . . . . . . . 8
4.5. LoRaWAN empty frame . . . . . . . . . . . . . . . . . . . 8
4.6. Unicast and multicast technology . . . . . . . . . . . . 8
5. SCHC-over-LoRaWAN . . . . . . . . . . . . . . . . . . . . . . 8
5.1. LoRaWAN FPort . . . . . . . . . . . . . . . . . . . . . . 8
5.2. Rule ID management . . . . . . . . . . . . . . . . . . . 9
5.3. IID computation . . . . . . . . . . . . . . . . . . . . . 10
5.4. Padding . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.5. Decompression . . . . . . . . . . . . . . . . . . . . . . 11
5.6. Fragmentation . . . . . . . . . . . . . . . . . . . . . . 11
5.6.1. DTag . . . . . . . . . . . . . . . . . . . . . . . . 11
5.6.2. Uplink fragmentation: From device to SCHC gateway . . 12
5.6.3. Downlink fragmentation: From SCHC gateway to device . 15
5.7. SCHC Fragment Format . . . . . . . . . . . . . . . . . . 18
5.7.1. All-0 SCHC fragment . . . . . . . . . . . . . . . . . 18
5.7.2. All-1 SCHC fragment . . . . . . . . . . . . . . . . . 18
5.7.3. Delay after each message to respect local regulation 18
6. Security considerations . . . . . . . . . . . . . . . . . . . 18
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 19
Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . 19
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 19
9.1. Normative References . . . . . . . . . . . . . . . . . . 20
9.2. Informative References . . . . . . . . . . . . . . . . . 21
Appendix A. Examples . . . . . . . . . . . . . . . . . . . . . . 21
A.1. Uplink - Compression example - No fragmentation . . . . . 21
A.2. Uplink - Compression and fragmentation example . . . . . 22
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