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6TiSCH Working Group                                        Seohyang Kim
Internet-Draft                                 Seoul National University
Intended status: Standards Track                           Hyung-Sin Kim
Expires: May 27, 2019                 University of California, Berkeley
                                                           Chongkown Kim
                                               Seoul National University
                                                       November 28, 2018


            Autonomous and dynamic TSCH cell allocation
        for time-varying traffic load and evolving topology

                  draft-ietf-6tisch-trfalice-00



Abstract

   This document provides the method that autonomously and dynamically
   schedules TSCH slotframe based on the current traffic load. In the
   introduction part, we introduce some basic knowledge on TSCH and
   RPL. After this, we introduce some existing TSCH schedulers and
   their limitations. They are classified as centralized, distributed,
   and autonomous. Then, we propose a novel autonomous and dynamic
   TSCH cell scheduler. With this, each node schedules its own TSCH
   slotframe and allocates additional cells based on the current
   traffic load without any negotiation or traffic overhead. Since
   they allocate additional cells only when needed, energy efficient
   operation can be achieved simultaneously.



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Copyright Notice

   Copyright (c) 2016 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Kim, et al.           Expires May 27, 2019                     [page 1]Internet-Draft                TRFALICE                    November 2018

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Table of Contents

 1.  Introduction . . . . . . . . . . . . . . . . . . . .. . . . . .  2
 2.  Requirements Language . . . . . . . . . . . . . . . . . . . . .  4
 3.  Terminology. . . . . . . . . . . . . . . . . . . . . . . .  . .  4
 4.  TSCH Schedulers . . . . . . . . . .. . . . .  . . . . . . . . .  4
      4.1.  Overview . . . . . . . . . . . . . . . . . . . . . . . .  4
      4.2.  Centralized Schedulers . . . . . . . . . . . . . . . . .  4
      4.3.  Distributed Schedulers  .  . . . . . . . . . . . . . . .  5
      4.4.  Autonomous Schedulers . .  . . . . . . . . . . . . . . .  5
 5.  Autonomous and Dynamic TSCH Cell Allocation  Method . . . . . .  6
      5.1.  Schedule of Unicast Slotframe. . . . . . . . . . . . . .  3
      5.2.  Schedule of Supplementary Slotframe. . . . . . . . . . .  3
      5.3.  Summary. . . . . . . . . . . . . . . . . . . . . . . . .  3
 6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 12
 7.  Security Considerations . . . . . . . . . . . . . . . . . . . . 12
 8.  Acknowlegement. . . . . . . . . . . . . . . . . . . . . . . . . 12
 9.  References. . . . . . . . . . . . . . . . . . . . . . . . . . . 13
     9.1.  Normative References. . . . . . . . . . . . . . . . . . . 13
     9.2.  Informative References. . . . . . . . . . . . . . . . . . 13
 Authors' Addresses . . . . . . . . . . . . . . . . . . . . .. . . . 14


1. Introduction

   TSCH is one mode on IEEE 802.15.4e standard and it is an acronym
   of Time Slotted Channel Hopping, which has the feature of Time
   Division Multiple Access with channel hopping. From 2003, IEEE
   802.15.4 standard has been introduced and the standard was extended
   with 2006 version. Zigbee is one of the mostly used protocol which
   is on the basis of 802.15.4 standard. However, the standard was not
   enough to support industrial network which requires higher
   reliability. To better support industrial markets by increasing
   robustness against external interference, the MAC portion of the
   standard has been amended. Among 5 modes it provides, TSCH is
   receiving most attentions from WSN researchers and industry market.
   Moreover, by Internet Engineering Task Force (IETF) 6TiSCH working
   group, it has been selected as a mac protocol to connect sensor
   nodes with Internet over IPv6.

   RPL is a routing protocol for low power and lossy network and has
   been standardized by the IETF RoLL WG in 2012. RPL builds tree

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