Using IEEE 802.15.4e Time-Slotted Channel Hopping (TSCH) in the Internet of Things (IoT): Problem Statement
RFC 7554
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RFC - Informational
(May 2015; Errata)
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2015-10-14
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draft-watteyne-6tisch-tsch
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(last changed 2015-02-06)
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RFC 7554 (Informational)
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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
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.
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
Appendix B. TSCH Features . . . . . . . . . . . . . . . . . . . 21
B.1. Collision-Free Communication . . . . . . . . . . . . . . 21
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