6TiSCH Minimal Scheduling Function (MSF)
draft-ietf-6tisch-msf-18
6TiSCH T. Chang, Ed.
Internet-Draft M. Vucinic
Intended status: Standards Track Inria
Expires: March 16, 2021 X. Vilajosana
Universitat Oberta de Catalunya
S. Duquennoy
RISE SICS
D. Dujovne
Universidad Diego Portales
September 12, 2020
6TiSCH Minimal Scheduling Function (MSF)
draft-ietf-6tisch-msf-18
Abstract
This specification defines the 6TiSCH Minimal Scheduling Function
(MSF). This Scheduling Function describes both the behavior of a
node when joining the network, and how the communication schedule is
managed in a distributed fashion. MSF is built upon the 6TiSCH
Operation Sublayer Protocol (6P) and the Minimal Security Framework
for 6TiSCH.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
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 March 16, 2021.
Chang, et al. Expires March 16, 2021 [Page 1]
Internet-Draft 6TiSCH Minimal Scheduling Function (MSF) September 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Interface to the Minimal 6TiSCH Configuration . . . . . . . . 4
3. Autonomous Cells . . . . . . . . . . . . . . . . . . . . . . 5
4. Node Behavior at Boot . . . . . . . . . . . . . . . . . . . . 6
4.1. Start State . . . . . . . . . . . . . . . . . . . . . . . 6
4.2. Step 1 - Choosing Frequency . . . . . . . . . . . . . . . 7
4.3. Step 2 - Receiving EBs . . . . . . . . . . . . . . . . . 7
4.4. Step 3 - Setting up Autonomous Cells for the Join
Process . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.5. Step 4 - Acquiring a RPL Rank . . . . . . . . . . . . . . 8
4.6. Step 5 - Setting up first Tx negotiated Cells . . . . . . 8
4.7. Step 6 - Send EBs and DIOs . . . . . . . . . . . . . . . 8
4.8. End State . . . . . . . . . . . . . . . . . . . . . . . . 8
5. Rules for Adding/Deleting Cells . . . . . . . . . . . . . . . 9
5.1. Adapting to Traffic . . . . . . . . . . . . . . . . . . . 9
5.2. Switching Parent . . . . . . . . . . . . . . . . . . . . 11
5.3. Handling Schedule Collisions . . . . . . . . . . . . . . 11
6. 6P SIGNAL command . . . . . . . . . . . . . . . . . . . . . . 13
7. Scheduling Function Identifier . . . . . . . . . . . . . . . 13
8. Rules for CellList . . . . . . . . . . . . . . . . . . . . . 13
9. 6P Timeout Value . . . . . . . . . . . . . . . . . . . . . . 14
10. Rule for Ordering Cells . . . . . . . . . . . . . . . . . . . 14
11. Meaning of the Metadata Field . . . . . . . . . . . . . . . . 14
12. 6P Error Handling . . . . . . . . . . . . . . . . . . . . . . 14
13. Schedule Inconsistency Handling . . . . . . . . . . . . . . . 15
14. MSF Constants . . . . . . . . . . . . . . . . . . . . . . . . 15
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