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 This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at https://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on 22 September 2022. Copyright Notice Copyright (c) 2022 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/ license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License. Martinez & Toutain Expires 22 September 2022 [Page 1] Internet-Draft LPWAN SCHC Meshed rules March 2022 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. Martinez & Toutain Expires 22 September 2022 [Page 2] Internet-Draft LPWAN SCHC Meshed rules March 2022 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 Martinez & Toutain Expires 22 September 2022 [Page 3] Internet-Draft LPWAN SCHC Meshed rules March 2022 [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, . [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, . 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 Martinez & Toutain Expires 22 September 2022 [Page 4]