[arin-ppml] SmartGrid deployments and talk

[Michael Richardson]

This is from the IETF ROLL WG mailing list.

Date: Tue, 20 Oct 2009 11:13:59 -0400
Message-Id: <87k4yq85e0.fsf at kelsey-ws.hq.ember.com>
From: Richard Kelsey <richard.kelsey at ember.com>

   Date: Tue, 20 Oct 2009 10:32:45 -0400
   From: Tim Winter <wintert at acm.org>

   To provide some additional background, one of the RFC5548 areas that may
   require to operate networks on the order of 10^7 nodes are smart metering
   applications in support of a large utility in a dense urban area.

   RPL ought to allow a deployment in support of such a large network to
   dynamically partition itself into smaller independent operating regions, by
   providing for a `divide and conquer' strategy (some have used a `drainage
   basin' metaphor).  Depending on the specifics of the deployment,
   implementation, number of LBRs, etc. it should be feasible to cause the
   partitioning such that each independent region may be operating over a
   target size, e.g. on the order of 10^3 nodes.  Specifically, the ability to
   provision of LBRs to act as independent DAG roots will allow them to draw
   the `closest' nodes to them.  As nodes affiliate themselves with specific
   LBR(s), and specific DAGs, they become logically partitioned and may exclude
   interaction with other neighboring nodes that are members of other
   unaffiliated DAGs.  A large deployment on the order of 10^7 nodes may then
   logically be viewed as, e.g., ~10^4 DAGs with ~10^3 nodes each.  This
   partitioning is dynamic and autonomous.

The electric metering network in Gothenburg, Sweden works
this way.  They have 250k 802.15.4/ZigBee nodes of 8k are
DAG roots ('concentrators' in ZigBee-speak), which averages
out to about 32 nodes in each DAG.

As an aside, Gothenburg's population is about 500k, so they
have one node for every two people.  I begin to understand
all the interest in this market.

There are some more details in this presentation by the
Gothenburg utility's project manager:

http://www.zigbee.org/imwp/download.asp?ContentID=16104

                             -Richard Kelsey
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