Routing Over Low power and Lossy networks (roll)
------------------------------------------------

Charter
Last Modified: 2009-02-02

Current Status: Active Working Group

Chair(s):
    JP Vasseur  <[email protected]>
    David Culler  <[email protected]>

Routing Area Director(s):
    Ross Callon  <[email protected]>
    David Ward  <[email protected]>

Routing Area Advisor:
    David Ward  <[email protected]>

Mailing Lists:
    General Discussion:[email protected]
    To Subscribe:      http://www.ietf.org/mailman/listinfo/roll
    Archive:           http://www.ietf.org/mail-archive/web/roll/

Description of Working Group:

Low power and Lossy networks (LLNs) are typically composed of many
embedded devices with limited power, memory, and processing resources
interconnected by a variety of links, such as IEEE 802.15.4, Bluetooth,
Low Power WiFi. LLNs are transitioning to an end-to-end IP-based
solution to avoid the problem of non-interoperable networks
interconnected by protocol translation gateways and proxies. In
addition, LLNs have specific routing requirements that may not be met by
existing routing protocols, such as OSPF, IS-IS, AODV and OLSR. For
example path selection must be designed to take into consideration the
specific power capabilities, attributes and functional characteristics
of the links and nodes in the network.

There is a wide scope of application areas for LLNs, including
industrial monitoring, building automation (HVAC, lighting, access
control, fire), connected home, healthcare, environmental monitoring,
urban sensor networks sensor networks, assets tracking, refrigeration.
The Working Group will only focus on routing solutions for a subset of
these. It will focus on  industrial, connected home/building and urban
sensor networks and it will  determine the routing requirements for
these scenarios.

The Working Group will provide an IPv6 only routing architectural
framework for these application scenarios. Given the transition of this
technology to  IP, at this time it is believed that an IPv4 solution is
not necessary. The Framework will take into consideration various
aspects including high reliability in the presence of time varying loss
characteristics and connectivity while permitting low-power operation
with very modest memory and CPU pressure in networks potentially
comprising a very large number (several thousands) of nodes.

The Working Group will explore aspects of mobility within a single LLN
(if any) in the routing requirement creation.

The Working Group will pay particular attention to routing security and
manageability (e.g., self configuration) issues. It will also need to
consider the transport characteristic the routing protocol messages will
experience. Mechanisms that protect an LLN from congestion collapse or
that establish some degree of fairness between concurrent communication
sessions are out of scope of the Working Group. It is expected that
applications utilizing LLNs define appropriate mechanisms.

Work Items:

- Produce routing requirements documents for Industrial, Connected
Home, Building and urban sensor networks. Each document will describe
the use case and the associated routing protocol requirements. The
documents will progress in collaboration with the 6lowpan Working Group
(INT area).

- Survey the applicability of existing protocols to LLNs. The aim of
this document will be to analyze the scaling and characteristics of
existing protocols and identify whether or not they meet the routing
requirements of the applications identified above. Existing IGPs, MANET,
NEMO, DTN routing protocols will be part of evaluation.

- Specification of routing metrics used in path calculation. This
includes static and dynamic link/node attributes required for routing in
LLNs.

- Provide an architectural framework for routing and path selection at
Layer 3 (Routing for LLN Architecture) that addresses such issues as
whether LLN routing protocols require a distributed and/or centralized
path computation models, whether additional hierarchy is necessary and
how it is applied. Manageability will be considered with each approach,
along with various trade-offs for maintaining low power operation,
including the presence of non-trivial loss and networks with a very
large number of nodes.

- Produce a routing security framework for routing in LLNs.

Goals and Milestones:

  Done         Submit Routing requirements for Industrial applications to the
               IESG to be considered as an Informational RFC.

  Done         Submit Routing requirements for Connected Home networks
               applications to the IESG to be considered as an Informational
               RFC.

  Jul 2008       Submit Routing requirements for Building applications to the
               IESG to be considered as an Informational RFC.

  Done         Submit Routing requirements for Urban networks applications to
               the IESG to be considered as an Informational RFC.

  Nov 2008       Submit Routing metrics for LLNs document to the IESG to be
               considered as a Proposed Standard.

  Feb 2009       Submit Protocol Survey to the IESG to be considered as an
               Informational RFC.

  Apr 2009       Submit Security Framework to the IESG to be considered as an
               Informational RFC

  May 2009       Submit the Routing for LLNs Architecture document to the IESG
               as an Informational RFC.

  Jun 2009       Recharter or close.


Internet-Drafts:

Posted Revised         I-D Title   <Filename>
------ ------- --------------------------------------------
Apr 2008 Jan 2009   <draft-ietf-roll-urban-routing-reqs-03.txt>
               Urban WSNs Routing Requirements in Low Power and Lossy Networks

Apr 2008 Jan 2009   <draft-ietf-roll-indus-routing-reqs-04.txt>
               Industrial Routing Requirements in Low Power and Lossy Networks

May 2008 Nov 2008   <draft-ietf-roll-home-routing-reqs-06.txt>
               Home Automation Routing Requirements in Low Power and Lossy
               Networks

Aug 2008 Jan 2009   <draft-ietf-roll-protocols-survey-05.txt>
               Overview of Existing Routing Protocols for Low Power and Lossy
               Networks

Oct 2008 Oct 2008   <draft-ietf-roll-terminology-00.txt>
               Terminology in Low power And Lossy Networks

Oct 2008 Jan 2009   <draft-ietf-roll-building-routing-reqs-02.txt>
               Building Automation Routing Requirements in Low Power and Lossy
               Networks

Request For Comments:

 None to date.

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