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