Re: [6lowpan] Mesh under routing and Neighbor Discovery

Myung Jong Lee <lee@ccny.cuny.edu> Tue, 05 June 2012 03:40 UTC

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From: Myung Jong Lee <lee@ccny.cuny.edu>
To: Samita Chakrabarti <samita.chakrabarti@ericsson.com>
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Subject: Re: [6lowpan] Mesh under routing and Neighbor Discovery
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Hi Damien and all,

Though I am not an active member for 6lowpan, I just like to note that
there  is a "mesh under" routing standard, IEEE 802.15.5 a recommended
practice, completed in 2009. You may take a look at it. It is built on IEEE
802.15.4b and sitting below IP layer.    I believe it could be one of the
feasible approaches for mesh under technologies. For the details, you may
refer to the standard itself or the paper, " IEEE 802.15.5 WPAN mesh
standard-low rate part: meshing the wireless sensor networks," IEEE JSAC,
Vol 28, No. 7, 2010 .

Thanks,

Myung


On Tue, Jun 5, 2012 at 9:10 AM, Samita Chakrabarti <
samita.chakrabarti@ericsson.com> wrote:

> **
> Hi Damien,
>
> Please find responses in-line.
>
>
>  ------------------------------
> *From:* 6lowpan-bounces@ietf.org [mailto:6lowpan-bounces@ietf.org] *On
> Behalf Of *Damien Roth
> *Sent:* Monday, June 04, 2012 5:03 AM
> *To:* 6lowpan@ietf.org
> *Subject:* [6lowpan] Mesh under routing and Neighbor Discovery
>
> Hello,
>
> I continue my investigations the neighbor discovery protocol
> for 6LoWPAN (draft-ietf-6lowpan-nd-18), and there is one point that remains
> unclear to me.
>
> With 6LoWPAN, two routing mechanisms can be used : route over and mesh
> under. Everything is OK with the route over mechanism but I'm locked with
> mesh-under. In mesh-under routing, there is only two entities, the 6LBR
> (border router) and the hosts. Multiple hops may be needed to for hosts to
> reach the 6LBR.
>
> ====> In mesh under case, the assumption is that all hosts are directly
> IP-reachable from 6LBR. How the packets are flown from a host to the 6LBR (
> using a L2-mechanism) is out of scope of the document. Currently I don't
> know of  L2-routing protocols for mesh-under network - however, there might
> be some proprietary ones.
>
> My problem is in multihop configuration : how the multicast Router
> Solicitation messages, used by the neighbor discovery protocol, can reach
> the 6LBR ?
> Does it depends on the routing protocol used ?
>
>
> ====>  Please check the section 10 (Examples) to get an understanding how
> the routers and hosts bootstrap in the multi-hop 6lowpan networks.  Initial
> multicast RS is sent only to the local subnet  and taken care by the local
> 6LR router in case of route-over scenario.
>
>
>
> -Samita
>
> _______________________________________________
> 6lowpan mailing list
> 6lowpan@ietf.org
> https://www.ietf.org/mailman/listinfo/6lowpan
>
>


-- 
Myung J. Lee, Ph.D
Professor
Dept. of Electrical and Computer Engineering
City University of New York, City College
140th Street, New York, NY 10031
(O)+1-212-650-7260
(E) lee@ccny.cuny.edu