Using IEEE 802.15.4e Time-Slotted Channel Hopping (TSCH) in the Internet of Things (IoT): Problem Statement
RFC 7554

Document Type RFC - Informational (May 2015; Errata)
Last updated 2015-10-14
Replaces draft-watteyne-6tisch-tsch
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IESG IESG state RFC 7554 (Informational)
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IANA IANA review state Version Changed - Review Needed
IANA action state No IC
Internet Engineering Task Force (IETF)                  T. Watteyne, Ed.
Request for Comments: 7554                             Linear Technology
Category: Informational                                    M. Palattella
ISSN: 2070-1721                                 University of Luxembourg
                                                               L. Grieco
                                                     Politecnico di Bari
                                                                May 2015

    Using IEEE 802.15.4e Time-Slotted Channel Hopping (TSCH) in the
              Internet of Things (IoT): Problem Statement

Abstract

   This document describes the environment, problem statement, and goals
   for using the Time-Slotted Channel Hopping (TSCH) Medium Access
   Control (MAC) protocol of IEEE 802.14.4e in the context of Low-Power
   and Lossy Networks (LLNs).  The set of goals enumerated in this
   document form an initial set only.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7554.

Watteyne, et al.              Informational                     [Page 1]
RFC 7554                       6TiSCH-TSCH                      May 2015

Copyright Notice

   Copyright (c) 2015 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
   (http://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
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   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.

Watteyne, et al.              Informational                     [Page 2]
RFC 7554                       6TiSCH-TSCH                      May 2015

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  TSCH in the LLN Context . . . . . . . . . . . . . . . . . . .   5
   3.  Problems and Goals  . . . . . . . . . . . . . . . . . . . . .   7
     3.1.  Network Formation . . . . . . . . . . . . . . . . . . . .   8
     3.2.  Network Maintenance . . . . . . . . . . . . . . . . . . .   8
     3.3.  Multi-Hop Topology  . . . . . . . . . . . . . . . . . . .   8
     3.4.  Routing and Timing Parents  . . . . . . . . . . . . . . .   8
     3.5.  Resource Management . . . . . . . . . . . . . . . . . . .   9
     3.6.  Dataflow Control  . . . . . . . . . . . . . . . . . . . .   9
     3.7.  Deterministic Behavior  . . . . . . . . . . . . . . . . .   9
     3.8.  Scheduling Mechanisms . . . . . . . . . . . . . . . . . .  10
     3.9.  Secure Communication  . . . . . . . . . . . . . . . . . .  10
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   5.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     5.1.  Normative References  . . . . . . . . . . . . . . . . . .  11
     5.2.  Informative References  . . . . . . . . . . . . . . . . .  11
   Appendix A.  TSCH Protocol Highlights . . . . . . . . . . . . . .  15
     A.1.  Time Slots  . . . . . . . . . . . . . . . . . . . . . . .  15
     A.2.  Slotframes  . . . . . . . . . . . . . . . . . . . . . . .  15
     A.3.  Node TSCH Schedule  . . . . . . . . . . . . . . . . . . .  15
     A.4.  Cells and Bundles . . . . . . . . . . . . . . . . . . . .  16
     A.5.  Dedicated vs. Shared Cells  . . . . . . . . . . . . . . .  17
     A.6.  Absolute Slot Number  . . . . . . . . . . . . . . . . . .  17
     A.7.  Channel Hopping . . . . . . . . . . . . . . . . . . . . .  17
     A.8.  Time Synchronization  . . . . . . . . . . . . . . . . . .  18
     A.9.  Power Consumption . . . . . . . . . . . . . . . . . . . .  19
     A.10. Network TSCH Schedule . . . . . . . . . . . . . . . . . .  19
     A.11. Join Process  . . . . . . . . . . . . . . . . . . . . . .  19
     A.12. Information Elements  . . . . . . . . . . . . . . . . . .  20
     A.13. Extensibility . . . . . . . . . . . . . . . . . . . . . .  20
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