[6tisch] Comment on draft-ietf-6tisch-msf-01

[Christian Hopfner <[e-mail]>]

Hi all,

I have some question comments on latest draft of msf.

3. Autonomous Unicast Cells
MSF nodes MUST initialize Slotframe 1 with a set of default cells for
unicast communication with their neighbors. These cells are referred
to as ’autonomous cells’, because they are maintained autonomously by
each node. Each node has:

1. One cell to receive, at a [slotOffset,channelOffset] computed as
a hash of the node’s EUI64 (detailed next). The cell options for
this cell are RX=1.

2. For each neighbor in the IPv6 neighbor table, one cell to
transmit, at a [slotOffset,channelOffset] computed as a hash of
the neighbor’s EUI64 (detailed next). The cell options for this
cell are TX=1, SHARED=1.

CH I’m not sure if this 2nd item makes sense discussion it with the background of low-power and bandwidth capacity. Assuming we have space for 30 neighbor entries within my neighbor table this will lead to 32 cells being allocated within my schedule. 30 neighbors, my autonomous RX cell and shared minimal. This will reduce available bandwidth for the node tremendously. And might increase power consumption in parallel if we do not a have an intelligent scheduler which keeps the device in sleep even for active TX cells if we know in advance that there is no packet in the queue for the specific neighbor.

What about considering only RPL neighbors for allocation TX, S cells to. This will keep the amount of allocated cell at least at a minimum necessary cells. If it comes to network transformation due to changing RPL parameters the Parent Switch functionality of msf will take care of reallocating installed cells.

Mit freundlichen Grüßen I Best regards

Christian Hopfner

________________________________

Developer | TPI F&E Plattform Informatik
Endress+Hauser SE+Co. KG | Hauptstrasse 1 | 79689 Maulburg | Germany
Phone: [phone]
[e-mail] | www.pcm.endress.com


________________________________

Endress+Hauser SE+Co. KG
Registergericht: Amtsgericht Freiburg i.Br. HRA 670225
Sitz der Gesellschaft: Maulburg
Persönlich haftender Gesellschafter: Endress+Hauser Administration SE
Sitz des persönlich haftenden Gesellschafters: Maulburg
Registergericht: Amtsgericht Freiburg i.Br. HRB 717326
Vorstand: Dr. Andreas Mayr
Aufsichtsratsvorsitzender: Matthias Altendorf

________________________________

Gemäss der Datenschutzgrundverordnung (EU-DSGVO) sind wir verpflichtet, Sie zu informieren,
wenn wir personenbezogene Daten von Ihnen erheben.

Dieser Informationspflicht kommen wir mit folgendem Datenschutzhinweis<https://www.de.endress.com/de/cookies-endress+hauser-website> nach.

________________________________

Endress+Hauser SE+Co. KG
Register Court: Local Court of Freiburg i.Br. HRA 670225
Registered Office: Maulburg
General Partner: Endress+Hauser Administration SE
Registered Office of General Partner: Maulburg
Register Court: Local Court of Freiburg i.Br. HRB 717326
Chief Executive Officer: Dr. Andreas Mayr
Chairman of the Board: Matthias Altendorf

________________________________

According to the General Data Protection Regulation,
we are obliged to inform you when collecting your personal data.
We comply with this information duty with the following Data Protection Statement<https://www.de.endress.com/en/endress-hauser-website-cookies/en-data-protection-notice-de>

________________________________



Disclaimer:

The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential, proprietary, and/or privileged
material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities
other than the intended recipient is prohibited. If you receive this in error, please contact the sender and delete the material from any computer.
This e-mail does not constitute a contract offer, a contract amendment, or an acceptance of a contract offer unless explicitly and conspicuously designated or stated as such.