Problem Statement for Generalizing 6TiSCH to Multiple PHYs
draft-munoz-6tisch-multi-phy-nodes-00

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6TiSCH                                                     J. Munoz, Ed.
Internet-Draft                                                     Inria
Intended status: Informational                             X. Vilajosana
Expires: January 3, 2019                 Universitat Oberta de Catalunya
                                                                T. Chang
                                                                   Inria
                                                            July 2, 2018

       Problem Statement for Generalizing 6TiSCH to Multiple PHYs
                 draft-munoz-6tisch-multi-phy-nodes-00

Abstract

   The present document describes the needs that arise when considering
   to use more than one PHY in a IPv6 over the TSCH mode of
   IEEE802.15.4e (6TiSCH) network.  These considerations are present in:
   the choice of the PHY, the MAC layer -TSCH- configuration, the 6top
   protocol, 6LoWPAN and RPL.

Status of This Memo

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   This Internet-Draft will expire on January 3, 2019.

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   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Munoz, et al.            Expires January 3, 2019                [Page 1]
Internet-Draft    draft-munoz-6tisch-multi-phy-nodes-00        July 2018

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Neighbor Considerations . . . . . . . . . . . . . . . . . . .   3
   3.  MAC Sub-Layer Considerations  . . . . . . . . . . . . . . . .   4
     3.1.  Network Formation . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Discovering Node PHY Capabilities . . . . . . . . . . . .   4
     3.3.  TSCH Configuration  . . . . . . . . . . . . . . . . . . .   5
       3.3.1.  Timeslot Duration . . . . . . . . . . . . . . . . . .   5
       3.3.2.  Channel Hopping Sequence  . . . . . . . . . . . . . .   5
   4.  6top Sub-Layer Considerations . . . . . . . . . . . . . . . .   6
     4.1.  Resource Allocation . . . . . . . . . . . . . . . . . . .   6
     4.2.  Duty Cycle Regulations  . . . . . . . . . . . . . . . . .   6
   5.  6LoWPAN Considerations  . . . . . . . . . . . . . . . . . . .   6
   6.  RPL Considerations  . . . . . . . . . . . . . . . . . . . . .   6
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   7
     9.3.  Other Informative References  . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   The protocol stack in a IPv6 over the TSCH mode of IEEE802.15.4e
   (6TiSCH) network is defined by multiple protocols covering multiple
   layers starting from the link layer, up to the application layer
   [I-D.ietf-6tisch-architecture].  This protocol stack sits on top of
   the IEEE802.15.4 O-QPSK PHY, at 2.4 GHz, that allows the exchange of
   frames of 127 B over 16 frequencies at 250 kbps.  Since 2012, more
   PHYs are available within the IEEE802.15.4 specification, e.g. the
   IEEE802.15.4g amendment [IEEE802154g] of the IEEE802.15.4 standard,
   designed for Smart Utility Networks (SUN) application, introducing
   the SUN-OFDM, SUN-FSK and SUN-O-QPSK PHYs.  The main differences with
   the previous IEEE802.15.4 O-QPSK PHY is support of link-layer frames
   up to 2047 B long, the possibility of being used either at the same
   2.4 GHz band or in sub-GHz, regionally defined bands, and variable
   data rate that goes from 6.25 kbps up to 800 kbps.

   Radio chips supporting all these new PHY configurations are now
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