An Architecture for IPv6 over the TSCH mode of IEEE 802.15.4
draft-ietf-6tisch-architecture-28
6TiSCH P. Thubert, Ed.
Internet-Draft Cisco Systems
Intended status: Informational 29 October 2019
Expires: 1 May 2020
An Architecture for IPv6 over the TSCH mode of IEEE 802.15.4
draft-ietf-6tisch-architecture-28
Abstract
This document describes a network architecture that provides low-
latency, low-jitter and high-reliability packet delivery. It
combines a high-speed powered backbone and subnetworks using IEEE
802.15.4 time-slotted channel hopping (TSCH) to meet the requirements
of LowPower wireless deterministic applications.
Status of This Memo
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This Internet-Draft will expire on 1 May 2020.
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Copyright (c) 2019 IETF Trust and the persons identified as the
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Thubert Expires 1 May 2020 [Page 1]
Internet-Draft 6tisch-architecture October 2019
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1. New Terms . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2. Abbreviations . . . . . . . . . . . . . . . . . . . . . . 10
2.3. Related Documents . . . . . . . . . . . . . . . . . . . . 11
3. High Level Architecture . . . . . . . . . . . . . . . . . . . 12
3.1. A Non-Broadcast Multi-Access Radio Mesh Network . . . . . 12
3.2. A Multi-Link Subnet Model . . . . . . . . . . . . . . . . 14
3.3. TSCH: A Deterministic MAC Layer . . . . . . . . . . . . . 15
3.4. Scheduling TSCH . . . . . . . . . . . . . . . . . . . . . 16
3.5. Distributed vs. Centralized Routing . . . . . . . . . . . 17
3.6. Forwarding Over TSCH . . . . . . . . . . . . . . . . . . 18
3.7. 6TiSCH Stack . . . . . . . . . . . . . . . . . . . . . . 19
3.8. Communication Paradigms and Interaction Models . . . . . 21
4. Architecture Components . . . . . . . . . . . . . . . . . . . 22
4.1. 6LoWPAN (and RPL) . . . . . . . . . . . . . . . . . . . . 22
4.1.1. RPL-Unaware Leaves and 6LoWPAN ND . . . . . . . . . . 22
4.1.2. 6LBR and RPL Root . . . . . . . . . . . . . . . . . . 23
4.2. Network Access and Addressing . . . . . . . . . . . . . . 23
4.2.1. Join Process . . . . . . . . . . . . . . . . . . . . 24
4.2.2. Registration . . . . . . . . . . . . . . . . . . . . 26
4.3. TSCH and 6top . . . . . . . . . . . . . . . . . . . . . . 27
4.3.1. 6top . . . . . . . . . . . . . . . . . . . . . . . . 27
4.3.2. Scheduling Functions and the 6top protocol . . . . . 29
4.3.3. 6top and RPL Objective Function operations . . . . . 30
4.3.4. Network Synchronization . . . . . . . . . . . . . . . 31
4.3.5. Slotframes and CDU matrix . . . . . . . . . . . . . . 32
4.3.6. Distributing the reservation of cells . . . . . . . . 33
4.4. Schedule Management Mechanisms . . . . . . . . . . . . . 34
4.4.1. Static Scheduling . . . . . . . . . . . . . . . . . . 34
4.4.2. Neighbor-to-neighbor Scheduling . . . . . . . . . . . 35
4.4.3. Remote Monitoring and Schedule Management . . . . . . 36
4.4.4. Hop-by-hop Scheduling . . . . . . . . . . . . . . . . 38
4.5. On Tracks . . . . . . . . . . . . . . . . . . . . . . . . 38
4.5.1. General Behavior of Tracks . . . . . . . . . . . . . 39
4.5.2. Serial Track . . . . . . . . . . . . . . . . . . . . 39
4.5.3. Complex Track with Replication and
Elimination . . . . . . . . . . . . . . . . . . . . . 40
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