IPv6 over Low-Power Wireless Personal Area Network (6LoWPAN) Paging Dispatch
RFC 8025

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Internet Engineering Task Force (IETF)                   P. Thubert, Ed.
Request for Comments: 8025                                         Cisco
Updates: 4944                                                  R. Cragie
Category: Standards Track                                            ARM
ISSN: 2070-1721                                            November 2016

               IPv6 over Low-Power Wireless Personal Area
                   Network (6LoWPAN) Paging Dispatch

Abstract

   This specification updates RFC 4944 to introduce a new context switch
   mechanism for IPv6 over Low-Power Wireless Personal Area Network
   (6LoWPAN) compression, expressed in terms of Pages and signaled by a
   new Paging Dispatch.

Status of This Memo

   This is an Internet Standards Track document.

   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).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   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/rfc8025.

Copyright Notice

   Copyright (c) 2016 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.

Thubert & Cragie             Standards Track                    [Page 1]
RFC 8025                 6LoWPAN Paging Dispatch           November 2016

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Updating RFC 4944 . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Page 1 Paging Dispatch  . . . . . . . . . . . . . . . . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
     6.1.  Page Switch Dispatch Types  . . . . . . . . . . . . . . .   5
     6.2.  New Column in Dispatch Type Registry  . . . . . . . . . .   5
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   The design of Low-Power and Lossy Networks (LLNs) is generally
   focused on saving energy, which is often a very constrained resource.
   Other constraints, such as memory capacity and duty cycle
   restrictions on LLN devices, usually derive from that primary
   concern.  Energy is often available only from primary batteries that
   are expected to last for years or is scavenged from the environment
   in very limited amounts.  Any protocol that is intended for use in
   LLNs must be designed with a primary focus on saving energy, which is
   a strict requirement.

   Controlling the amount of data transmission is one possible means of
   saving energy.  In a number of LLN standards, the frame size is
   limited to much smaller values than the IPv6 maximum transmission
   unit (MTU) of 1280 bytes.  In particular, an LLN that relies on the
   classical Physical Layer (PHY) of IEEE 802.15.4 [IEEE.802.15.4] is
   limited to 127 bytes per frame.  The need to compress IPv6 packets
   over IEEE 802.15.4 led to the 6LoWPAN Header Compression (6LoWPAN-HC)
   [RFC6282] work.

   As more and more protocols need to be compressed, the encoding
   capabilities of the original dispatch defined in the 6LowPAN
   adaptation-layer framework ([RFC4944] and [RFC6282]) becomes
   saturated.  This specification introduces a new context switch
   mechanism for 6LoWPAN compression, expressed in terms of Pages and
   signaled by a new Paging Dispatch mechanism.

Thubert & Cragie             Standards Track                    [Page 2]
RFC 8025                 6LoWPAN Paging Dispatch           November 2016

2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in