Internet DRAFT - draft-martinez-lpwan-meshed-rules
draft-martinez-lpwan-meshed-rules
lpwan Working Group I. Martinez
Internet-Draft L. Toutain
Intended status: Standards Track Institut MINES TELECOM; IMT Atlantique
Expires: 22 September 2022 21 March 2022
Can Rules be adapted to a Meshed environment
draft-martinez-lpwan-meshed-rules-00
Abstract
This document specifies how openSCHC handles the rule selection and
how this process can be extended to a meshed environment.
Status of This Memo
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Rule Manager . . . . . . . . . . . . . . . . . . . . . . . . 2
3. Extending the model . . . . . . . . . . . . . . . . . . . . . 3
4. Management with simple identified rules . . . . . . . . . . . 3
5. Management with double identified rules . . . . . . . . . . . 3
6. Normative References . . . . . . . . . . . . . . . . . . . . 3
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 4
1. Introduction
This document specifies how openSCHC handles the rule selection and
how this process can be extended to a meshed environment.
2. Rule Manager
OpenSCHC imports rule in JSON, such has:
[{
"DeviceID" : "udp:90.27.174.128:8888",
"SoR" : [
{
"RuleID": 6,
"RuleIDLength": 3,
"Compression": [
....
Figure 1: Simple identified SoR.
A specific device may have several rules, identified in the SoR (Set
of Rules) key. The device is identified by a DeviceID. OpenSCHC
allows to send SCHC packet over an udp tunnel. In that case, the
device ID starts with the udp keyword, followed by the IP address and
the port number.
In that architecture, the core SCHC may contains several devices'
rules, idenfified by different ID. The device side contains only the
SoR associated to the device.
When a packet arrive to the SCHC core, a machting rule is searched
among all the rule. The core SCHC uses the device ID to effectively
send the SCHC packet to the device.
The device answers back to the core SCHC, ignoring the device ID
since this value identifies the device itself.
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So, we can name core a SCHC instance containing rules that does not
contains its own ID and a device a SCHC instance containing rules
that contains only its own ID. Communication from device to core is
upstream and downstream in the reverse direction.
3. Extending the model
This example is defined for a star toplogy, and devices can send back
their response in case of UDP tunnel or use the media in case of
LPWAN. In a meshed network, several instances may coexist and use
the same ruleID for a device but the rule itself can be different.
The previous rule can be updated to add a CoreID:
[{
"DeviceID" : "udp:90.27.174.128:8888",
"CoreID": "udp:123.1.2.3:23628"
"SoR" : [
{
"RuleID": 6,
"RuleIDLength": 3,
"Compression": [
....
Figure 2: Double identified SoR.
The process for the core compression is the same. When the device
receives the SCHC packet, it identifies the coreID and select only
rules coming from this instance. When the devices sends a packet,
instead of replying on the same port.
4. Management with simple identified rules
A device receives a SCHC packet on a single idendified SoR, keeps
track of the sender to reply. This could be either the technology or
the address of the core. Only one core is allowed in that case.
5. Management with double identified rules
A device receiving a SCHC packet on a double identifie SoR, does not
have to keep track of the core address. When a packet needs to be
compressed, the selected rule indicates where to send the SCHC
packet. The device may have several SoR corresponding to each core.
6. Normative References
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[RFC8724] Minaburo, A., Toutain, L., Gomez, C., Barthel, D., and JC.
Zuniga, "SCHC: Generic Framework for Static Context Header
Compression and Fragmentation", RFC 8724,
DOI 10.17487/RFC8724, April 2020,
<https://www.rfc-editor.org/info/rfc8724>.
[RFC8824] Minaburo, A., Toutain, L., and R. Andreasen, "Static
Context Header Compression (SCHC) for the Constrained
Application Protocol (CoAP)", RFC 8824,
DOI 10.17487/RFC8824, June 2021,
<https://www.rfc-editor.org/info/rfc8824>.
Authors' Addresses
Ivan Marino Martinez Bolivar
Institut MINES TELECOM; IMT Atlantique
2 rue de la Chataigneraie
CS 17607
35576 Cesson-Sevigne Cedex
France
Email: ivan-marino.martinez-bolivar@imt-atlantique.fr
Laurent Toutain
Institut MINES TELECOM; IMT Atlantique
2 rue de la Chataigneraie
CS 17607
35576 Cesson-Sevigne Cedex
France
Email: Laurent.Toutain@imt-atlantique.fr
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