6TiSCH Minimal Scheduling Function (MSF)
draft-ietf-6tisch-msf-17

Document Type Active Internet-Draft (6tisch WG)
Last updated 2020-08-03
Stream IETF
Intended RFC status Proposed Standard
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Document shepherd Pascal Thubert
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Needs a YES. Needs one more YES or NO OBJECTION position to pass.
Responsible AD Erik Kline
Send notices to Pascal Thubert <pthubert@cisco.com>
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6TiSCH                                                     T. Chang, Ed.
Internet-Draft                                                M. Vucinic
Intended status: Standards Track                                   Inria
Expires: 4 February 2021                                   X. Vilajosana
                                         Universitat Oberta de Catalunya
                                                            S. Duquennoy
                                                               RISE SICS
                                                              D. Dujovne
                                              Universidad Diego Portales
                                                           3 August 2020

                6TiSCH Minimal Scheduling Function (MSF)
                        draft-ietf-6tisch-msf-17

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-
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   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 4 February 2021.

Chang, et al.            Expires 4 February 2021                [Page 1]
Internet-Draft  6TiSCH Minimal Scheduling Function (MSF)     August 2020

Copyright Notice

   Copyright (c) 2020 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.

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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