[6lo] Mail regarding draft-ietf-6lo-plc

[LAVENU Cedric <[e-mail]>]

Dear authors of draft-hou-6lo-plc<https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-hou-6lo-plc%2F&data=05%7C01%7Ccedric-2.lavenu%40edf.fr%7C4a8bff0487624999efe808da229efb7c%7Ce242425b70fc44dc9ddfc21e304e6c80%7C1%7C0%7C637860363459637619%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=gEP%2B8C5kjsp7WQBPmsvDgXaZ%2BzUBXoW2PwU8nWV6TpM%3D&reserved=0>,

I reviewed your ID and discovered some technical items are not totally in line with latest G3-PLC / ITU-T G.9903 Specifications.
Let me know should you have any question/comment.

>> The equivalence between Full-function device, an IEEE 802.15.4 term, (as used in G.9903) and coordinator in other standards is wrong; we only of FFD in G3-PLC (PAN device or PAN coord.)

   +---------------+----------------+------------------+---------------+
   |  IEEE 1901.2  |  IEEE 1901.1   |   ITU-T G.9903   | This document |
   +---------------+----------------+------------------+---------------+
   |      PAN      |    Central     | PAN Coordinator  |      PAN      |
   |  Coordinator  |  Coordinator   |                  |  Coordinator  |
   |               |                |                  |               |
   |  Coordinator  |     Proxy      |  Full-function   |  Coordinator  |
   |               |  Coordinator   |      device      |               |
   |               |                |                  |               |
   |     Device    |    Station     |    PAN Device    |   PLC Device  |
   +---------------+----------------+------------------+---------------+

            Table 1: Terminology Mapping between PLC standards

>> A0ED is not used in G.9903 and IEs are also not supported as the PLC PHY&MAC is based on IEEE 802.15.4-2006.

   A PLC node distinguishes between an IPv6 PDU and a non-IPv6 PDU based
   on the equivalent of a EtherType in a layer-2 PLC PDU.  [RFC7973]
   defines a Ethertype of "A0ED" for LoWPAN encapsulation, and this
   information can be carried in the IE field in the MAC header of
   [IEEE_1901.2] or [ITU-T_G.9903].

>> G.9903 does not use the neighbour discovery address resolution procedure but it is assigned to PAN devices by the PAN Coordinator after successful joining (according to the LoWPAN Bootstrap Protocol, included as Annex E of G.9903).

4.3.  Unicast Address Mapping
4.3.2.  Unicast Address Mapping for IEEE 1901.2 and ITU-T G.9903

>> Direct PAN device to PAN device communication is also something that is possible with LOADng

  AODV-RPL([I-D.ietf-roll-aodv-rpl]) enables direct PLC device to PLC device
   communication, without being obliged to transmit frames through the
   PANC, which is a requirement often cited for AMI infrastructure.

>> The reference to ITU-T G.9903 is outdated (most recent revision was published in 2017 + and Amendment 1 was introduced in 2021)

   [ITU-T_G.9903]
              International Telecommunication Union, "Narrowband
              orthogonal frequency division multiplexing power line
              communication transceivers for G3-PLC networks",
              ITU-T G.9903, February 2014,
              https://www.itu.int/rec/T-REC-G.9903<https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.itu.int%2Frec%2FT-REC-G.9903&data=05%7C01%7Ccedric-2.lavenu%40edf.fr%7C4a8bff0487624999efe808da229efb7c%7Ce242425b70fc44dc9ddfc21e304e6c80%7C1%7C0%7C637860363459647577%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=2yU1FJxrLj2Zoo2wOrqZfsEdLlZQjT9Yu0shb8oC4PU%3D&reserved=0>.

Kind regards,
Cédric
Expert Research Engineer at EDF R&D
G3-PLC Alliance WS1 Chair





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