Re: [6tisch] 6TiSCH Protocol Stack in draft-ietf-6tisch-architecture-12

[Randy Turner <[e-mail]>]

Hi Guys,

I think this stack diagram looks ok — the “Scheduling Functions” block does not add a protocol encapsulation (on the wire) as the other blocks do, correct? It’s just an internal set of algorithms ?

If so, you could probably leave this off as “internal APIs” or non  on-the-wire functionality would not fit with the rest of the diagram - if non on-the-wire functionality is included then some type of visual cue would be
needed by RPL to indicate that RPL does not only utilize ICMPv6 for its’ functionality but also probably needs connectivity with the “IPv6” block for routing table access, or connectivity down to the TSCH block for neighbor table state changes, etc.

However, all that being said, it’s not a big deal, I’m interpreting this stack as an “on the wire” layering showing where protocol headers are encapsulated/deencapsulated, and I’m assuming there’s a scheduling function somewhere, but it’s really not a protocol layer.  Am I interpreting this correctly?

Thx,
Randy


> On Nov 29, 2017, at 3:31 AM, Pascal Thubert (pthubert) <[e-mail]> wrote:
> 
> Hello Yatch:
>  
> Great point. You’ll note that 6P runs at the top of the MAC and below 6LoWPAN and IP, so I’d rather not group it as you suggest.
>  
> What about the following:
>  
>    +-----+-----+
>    |    COMI   | 
>    +-----+-----+-----+------+-------+-----+
>    | CoAP/EDHOC/COSE |  6LoWPAN ND  | RPL |
>    +-----+-----+-----+------+-------+-----+
>    |       UDP       |      ICMPv6        |
>    +-----+-----+-----+-----+-------+------+
>    |                 IPv6                 |
>    +--------------------------------------+----------------------+
>    |     6LoWPAN HC   /   6LoRH HC        | Scheduling Functions |
>    +--------------------------------------+----------------------+
>    |     6top (to be IEEE Std 802.15.12) inc. 6top protocol (6P) |
>    +-------------------------------------------------------------+
>    |                 IEEE Std 802.15.4 TSCH                      |
>    +-------------------------------------------------------------+
>  
> ?
>  
> Pascal
> -----Original Message-----
> From: Yasuyuki Tanaka [mailto:[e-mail] <mailto:[e-mail]>] 
> Sent: mercredi 29 novembre 2017 06:33
> To: Pascal Thubert (pthubert) <[e-mail] <mailto:[e-mail]>>
> Cc: [e-mail] <mailto:[e-mail]>
> Subject: 6TiSCH Protocol Stack in draft-ietf-6tisch-architecture-12
>  
> Hello Pascal,
>  
> I have one minor comment on Figure 1 of the draft;
>  
>    https://tools.ietf.org/html/draft-ietf-6tisch-architecture-12#section-3.1 <https://tools.ietf.org/html/draft-ietf-6tisch-architecture-12#section-3.1>
>  
> My suggestion is to put "6LoWPAN HC / 6LoRH" directly on "IEEE Std
> 802.15.4 TSCH" and to add one box labeled with "Scheduling Functions".
> It would look like...
>  
> (suggested version)
>  
>        +-----+-----+
>        |    COMI   |
>        +-----+-----+-----+------+-------+-----+
>        | CoAP/EDHOC/COSE |  6LoWPAN ND  | RPL |
>        +-----+-----+-----+------+-------+-----+
>        |       UDP       |        ICMPv6      |
>        +-----+-----+-----+-----+-------+------+------------------------+
>        |                 IPv6                 |  Scheduling Functions  |
>        +--------------------------------------+------------------------+
>        |        6LoWPAN HC   /   6LoRH        |      6top protocol     |
>        +--------------------------------------+------------------------+
>        |                     IEEE Std 802.15.4 TSCH                    |
>        +---------------------------------------------------------------+
>  
> (current version)
>  
>        +-----+-----+
>        |    COMI   |
>        +-----+-----+-----+------+-------+-----+
>        | CoAP/EDHOC/COSE |  6LoWPAN ND  | RPL |
>        +-----+-----+-----+------+-------+-----+
>        |       UDP       |          ICMP      |
>        +-----+-----+-----+-----+-------+------+----+
>        |                 IPv6                      |
>        +-------------------------------------------+
>       |             6LoWPAN HC   /   6LoRH        |
>        +-------------------------------------------+
>        |                   6top                    |
>        +-------------------------------------------+
>        |             IEEE Std 802.15.4 TSCH        |
>        +-------------------------------------------+
>  
> "ICMP" is replaced with "ICMPv6" as well.
>  
> Thanks!
>  
> Best,
> Yatch
>  
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