An Architecture for IPv6 over the TSCH mode of IEEE 802.15.4
draft-ietf-6tisch-architecture-16
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6TiSCH P. Thubert, Ed.
Internet-Draft Cisco
Intended status: Standards Track November 8, 2018
Expires: May 12, 2019
An Architecture for IPv6 over the TSCH mode of IEEE 802.15.4
draft-ietf-6tisch-architecture-16
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
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 May 12, 2019.
Copyright Notice
Copyright (c) 2018 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 Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Thubert Expires May 12, 2019 [Page 1]
Internet-Draft 6tisch-architecture November 2018
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1. BCP 14 . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2. References . . . . . . . . . . . . . . . . . . . . . . . 4
2.3. Subset of a 6LoWPAN Glossary . . . . . . . . . . . . . . 5
3. High Level Architecture . . . . . . . . . . . . . . . . . . . 6
3.1. 6TiSCH Stack . . . . . . . . . . . . . . . . . . . . . . 6
3.2. TSCH: A Deterministic MAC Layer . . . . . . . . . . . . . 8
3.3. Scheduling TSCH . . . . . . . . . . . . . . . . . . . . . 9
3.4. Routing and Forwarding Over TSCH . . . . . . . . . . . . 10
3.5. A Non-Broadcast Multi-Access Radio Mesh Network . . . . . 12
3.6. A Multi-Link Subnet Model . . . . . . . . . . . . . . . . 13
3.7. Join Process and Registration . . . . . . . . . . . . . . 15
4. Architecture Components . . . . . . . . . . . . . . . . . . . 17
4.1. 6LoWPAN (and RPL) . . . . . . . . . . . . . . . . . . . . 17
4.1.1. RPL Leaf Support in 6LoWPAN ND . . . . . . . . . . . 17
4.1.2. RPL Root And 6LBR . . . . . . . . . . . . . . . . . . 18
4.2. TSCH and 6top . . . . . . . . . . . . . . . . . . . . . . 19
4.2.1. 6top . . . . . . . . . . . . . . . . . . . . . . . . 19
4.2.2. Scheduling Functions and the 6P protocol . . . . . . 19
4.2.3. 6top and RPL Objective Function operations . . . . . 20
4.2.4. Network Synchronization . . . . . . . . . . . . . . . 21
4.2.5. SlotFrames and Priorities . . . . . . . . . . . . . . 22
4.2.6. Distributing the reservation of cells . . . . . . . . 23
4.3. Communication Paradigms and Interaction Models . . . . . 25
4.4. Schedule Management Mechanisms . . . . . . . . . . . . . 26
4.4.1. Static Scheduling . . . . . . . . . . . . . . . . . . 26
4.4.2. Neighbor-to-neighbor Scheduling . . . . . . . . . . . 27
4.4.3. Remote Monitoring and Schedule Management . . . . . . 27
4.4.4. Hop-by-hop Scheduling . . . . . . . . . . . . . . . . 30
4.5. On Tracks . . . . . . . . . . . . . . . . . . . . . . . . 30
4.5.1. General Behavior of Tracks . . . . . . . . . . . . . 30
4.5.2. Serial Track . . . . . . . . . . . . . . . . . . . . 31
4.5.3. Complex Track with Replication and Elimination . . . 32
4.5.4. DetNet End-to-end Path . . . . . . . . . . . . . . . 32
4.5.5. Cell Reuse . . . . . . . . . . . . . . . . . . . . . 33
4.6. Forwarding Models . . . . . . . . . . . . . . . . . . . . 34
4.6.1. Track Forwarding . . . . . . . . . . . . . . . . . . 34
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