IETF 79 Proceedings

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IPv6 over Low power WPAN (6lowpan) (WG)

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Additional information is available at tools.ietf.org/wg/6lowpan

Chair(s): Carsten Bormann Geoffrey Mulligan Internet Area Director(s): Ralph Droms Jari Arkko Internet Area Advisor: Ralph Droms

Meeting Slides

• Consolidated slides

Internet-Drafts:

• Compression Format for IPv6 Datagrams in Low Power and Lossy Networks (6LoWPAN) (56672 bytes)
• Design and Application Spaces for 6LoWPANs (58200 bytes)
• Neighbor Discovery Optimization for Low-power and Lossy Networks (137445 bytes)
• Problem Statement and Requirements for 6LoWPAN Routing (71370 bytes)
• Transmission of IPv6 Packets over Bluetooth Low Energy (27198 bytes)

Request for Comments:

• IPv6 over Low-Power Wireless Personal Area Networks (6LoWPANs): Overview, Assumptions, Problem Statement, and Goals (RFC 4919) (27650 bytes)
• Transmission of IPv6 Packets over IEEE 802.15.4 Networks (RFC 4944) (67232 bytes)

Charter (as of 2009-04-13)

Background/Introduction:

Well-established fields such as control networks, and burgeoning ones
such as "sensor" (or transducer) networks, are increasingly being
based on wireless technologies. Most (but certainly not all) of these
nodes are amongst the most constrained that have ever been networked
wirelessly. Extreme low power (such that they will run potentially for
years on batteries) and extreme low cost (total device cost in single
digit dollars, and riding Moore's law to continuously reduce that
price point) are seen as essential enablers towards their deployment
in networks with the following characteristics:

* Significantly more devices than current local area networks

* Severely limited code and ram space (e.g., highly desirable to fit
the required code--MAC, IP and anything else needed to execute the
embedded application--in, for example, 32K of flash memory, using
8-bit microprocessors)

* Unobtrusive but very different user interface for configuration
(e.g., using gestures or interactions involving the physical world)

A chief component of these devices is wireless communication
technology. In particular, the IEEE 802.15.4 standard is very
promising for the lower (physical and link) layers. As for higher
layer functions, there is considerable interest from non-IETF groups
in using IP technology. The IEEE 1451.5 standard for wireless
transducers has a chapter for 6LoWPAN and the ISA SP100 standard for
wireless industrial networks has adopted 6LoWPAN for their network
layer. This working group is expected to coordinate and interact with
such groups.

Description of Working Group:
-----------------------------

The Working Group has completed two RFCs: "IPv6 over Low-Power
Wireless Personal Area Networks (6LoWPANs): Overview, Assumptions,
Problem Statement, and Goals" (RFC4919) that documents and discusses
the problem space and "Transmission of IPv6 Packets over IEEE 802.15.4
Networks" (RFC4944) which defines the format for the adaptation
between IPv6 and 802.15.4.

The Working Group will generate the necessary documents to ensure
interoperable implementations of 6LoWPAN networks and will define the
necessary security and management protocols and constructs for
building 6LoWPAN networks, paying particular attention to protocols
already available.

6lowpan will work closely with the Routing Over Low power and Lossy
networks (roll) working group which is developing IPv6 routing
solutions for low power and lossy networks (LLNs).

Work Items:
-----------

1. Produce "6LoWPAN Bootstrapping and 6LoWPAN IPv6 ND Optimizations"
to define limited extensions to IPv6 Neighbor Discovery [RFC4861] for
use specifically in low-power networks. This document (or documents)
will define how to bootstrap a 6LoWPAN network and explore ND
optimizations such as reusing the structure of the 802.15.4 network
(e.g., by using the coordinators), and reduce the need for multicast
by having devices talk to coordinators (without creating a single
point-of-failure, or changing the semantics of the IPv6 ND
multicasts).
This document or documents will be a proposed standard.

2. Produce "6LoWPAN Improved Header Compression" to describe mechanisms
to allow enhancements to the 6LoWPAN headers. Specifically this
document
will
describe compression of addresses that are not link-local. Additionally
this document
may include other enhancements or optimizations of the HC1 or HC2
6LoWPAN headers.
This document will be a proposed standard.

3. Produce "6LoWPAN Architecture" to describe the design and
implementation of 6LoWPAN networks. This document will cover the
concepts of "Mesh Under" and "Route Over", 802.15.4 design issues such
as operation with sleeping nodes, network components (both battery-
and line-powered), addressing, and IPv4/IPv6 network connections.
This document will be informational.

4. As a separate Internet Draft, "6LoWPAN Routing Requirements" will
describe 6LoWPAN-specific requirements on routing protocols used in
6LoWPANs, addressing both the "route-over" and "mesh-under" approach.
This
document will be created and owned by this working group but is
expected to
be reviewed by the ROLL WG.
This document will be informational.

5. Produce "Use Cases for 6LoWPAN" to define, for a small set of
applications with sufficiently unique requirements, how 6LoWPANs can
solve those requirements, and which protocols and configuration
variants can be used for these scenarios. The use cases will cover
protocols for transport, application layer, discovery, configuration
and commissioning.
This document will be informational.

6. Produce "6LoWPAN Security Analysis" to define the threat model of
6LoWPANs, to document suitability of existing key management
schemes and to discuss bootstrapping/installation/commissioning/setup
issues. This document will be referenced from the "security
considerations" of the other 6LoWPAN documents.
This document will be informational.

The working group will continue to reuse existing protocols and
mechanisms whenever reasonable and possible.

Non-milestone work items:
-------------------------

The Working Group will keep two running, often-respun documents:
-- implementers guide, collecting clarifying information based on
input from implementers, in particular as it becomes available from
interoperability events.
-- interoperability guide, providing information for interoperability
events, such as temporary interoperability testing strategies or
information about test harnesses used for interoperability testing.

Both documents will be WG documents, but their disposition is not
decided at this point (one example for such a document became RFC 4815
after five years of maintenance and 22 revisions).

Goals and Milestones:

Done		Working group last call on draft-ietf-lowpan-goals-assumptions-xx.txt
Done		Submit draft-ietf-lowpan-goals-assumptions-xx.txt to IESG for consideration of publication as Informational
Done		Working Group Last Call on draft-ietf-lowpan-ipv6-over-802.15.4-xx.txt
Done		Submit draft-ietf-lowpan-ipv6-over-802.15.4-xx.txt to IESG for consideration of publication as Proposed Standard
Aug 2008		Submit Improved Header Compression document to IESG for consideration as a proposed standard
Aug 2008		Submit Security Analysis document to IESG for consideration as an Informational RFC
Sep 2008		Submit Architecture document to IESG for consideration as an Informational RFC
Sep 2008		Submit Routing Requirements document to IESG for consideration as an Informational RFC
Nov 2008		Submit Bootstrapping and ND Optimizations document to IESG to be considered as a Proposed Standard
Dec 2008		Submit Use Case document to IESG as an Informational RFC