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From: Alexander Pelov <a@ackl.io>
Date: Mon, 3 Jun 2019 21:25:29 +0200
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To: lp-wan <lp-wan@ietf.org>
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Subject: [lp-wan] Call for agenda items for next interim (June 12)
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Dear all,

Last week we had great discussions and presentations on SCHC-over-LoRaWAN
and SCHC for CoAP.

Our next interim is in a little bit more than a week - June 12.
If you wish to add an item to the agenda please drop a line to the Chairs
by the end of this week (ideally by Wednesday, June 5th).

Cheers,
Pascal and Alexander

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<div dir=3D"ltr">Dear all,<div><br></div><div>Last week we had great discus=
sions and presentations on SCHC-over-LoRaWAN and SCHC for CoAP.</div><div><=
br></div><div>Our next interim is in a little bit more than a week - June 1=
2.</div><div>If you wish to add an item to the=C2=A0agenda please drop a li=
ne to the Chairs by the end of this week (ideally by Wednesday, June 5th).<=
/div><div><br></div><div>Cheers,</div><div>Pascal and=C2=A0<span class=3D"g=
mail-il">Alexander</span></div></div>

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From: Laurent Toutain <laurent.toutain@imt-atlantique.fr>
Date: Wed, 5 Jun 2019 17:26:28 +0200
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Subject: [lp-wan] SCHC over LoRaWAN review
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Dear Author,

As discussed during the interim, you will find some comments on the schc
over LoRAWAN draft. I like the approach, but I have some questions about
the way it is done.

- the draft should be more precise on the relation between FPort and
RuleID. The first time I read the draft I thought that the FPort was the
ruleID. What I understand after, tell me if it is true, the 3 FPort defined
in the document are telling that the LoRaWAN PDU is a SCHC message.
- the relation between compression and fragmentation is not clear. The
introduction describes a lot the compression and the rest of the document
gives only rules for fragmentation.
if I understand well FPort 20 is for an implicit fragmentation rule and
port 21 for any SCHC message starting with a ruleID. Why the document
limits it to fragmentation?

- I don't understand either the reason to have 3 byte long tiles, why a so
small value? Why for instance 6 cannot be used ?

The rest of the comments are in the world file with comments (sorry for
that, if it causes trouble I will translate it into ascii).

Laurent

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<div dir=3D"ltr"><div>Dear Author, <br></div><div><br></div><div>As discuss=
ed during the interim, you will find some comments on the schc over LoRAWAN=
 draft. I like the approach, but I have some questions about the way it is =
done. <br></div><div><br></div><div>- the draft should be more precise on t=
he relation between FPort and RuleID. The first time I read the draft I tho=
ught that the FPort was the ruleID. What I understand after, tell me if it =
is true, the 3 FPort defined in the document are telling that the LoRaWAN P=
DU is a SCHC message. <br></div><div>- the relation between compression and=
 fragmentation is not clear. The introduction describes a lot the compressi=
on and the rest of the document gives only rules for fragmentation. <br></d=
iv><div>if I understand well FPort 20 is for an implicit fragmentation rule=
 and port 21 for any SCHC message starting with a ruleID. Why the document =
limits it to fragmentation?</div><div><br></div><div>- I don&#39;t understa=
nd either the reason to have 3 byte long tiles, why a so small value? Why f=
or instance 6 cannot be used ? <br></div><div><br></div><div>The rest of th=
e comments are in the world file with comments (sorry for that, if it cause=
s trouble I will translate it into ascii). <br></div><div><br></div><div>La=
urent<br></div></div>

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From: <dominique.barthel@orange.com>
To: Laurent Toutain <laurent.toutain@imt-atlantique.fr>, lp-wan <lp-wan@ietf.org>
Thread-Topic: [lp-wan] SCHC over LoRaWAN review
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Date: Wed, 5 Jun 2019 15:56:39 +0000
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Subject: Re: [lp-wan] SCHC over LoRaWAN review
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From: ivaylo petrov <ivaylo@ackl.io>
Date: Thu, 6 Jun 2019 10:16:41 +0200
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To: Laurent Toutain <laurent.toutain@imt-atlantique.fr>,  "BARTHEL Dominique IMT/OLPS" <dominique.barthel@orange.com>
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Subject: Re: [lp-wan] SCHC over LoRaWAN review
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Hello Laurent and Dominique,

Thank you for your comments! I think we can add or edit some text to make
those points clearer. My comments regarding your questions.

- On your point about *relation between FPort and RuleID*, I think that
Dominique's proposition could indeed make this part clearer.

- On your point about *relation between compression and fragmentation, *we
can add a bit more text about it, but our general idea was that compression
depends much more on the specific scenario, so we are only providing the
required parameters for it and we leave it to the <<*user>> * to figure out
the remaining details. This is why this part is much shorter and probably
less detailed. The fragmentation is the part that seemed the most likely
source of interoperability issues and that is why most of our efforts so
far have been concentrated on it.

- While tile size of 6 could be used, the idea to have it only 3 bytes long
is that mac commands in FOpts can be placed, without affecting too much the
fragmentation. In addition, different payload sizes seem to fit well with
this tile size. My guess is that only through observing real traffic we
will be able to select the best tile size for most cases. If you have
reasons to believe that other tile size will be more appropriate, please
let us know.

Best regards,


<https://ackl.io/>
*Ivaylo Petrov*

Chief Architect

+33 2 22 06 05 77

www.ackl.io

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On Wed, Jun 5, 2019 at 5:56 PM <dominique.barthel@orange.com> wrote:

> Hello Laurent,
>
> Having discussed it with the authors, I feel I can answer some of your
> questions.
> The concatanation of the Fport byte and the few bits following constitute
> the Rule ID. The number of "few bits" is variable based on the first
> (Fport) byte, therefore we have a variable-length RuleID.
> In order to be more in the spirit of the generic SCHC description draft, =
I
> suggest that the RuleID be described in the schc-over-LoRaWAN draft the
> following way
>
>    - The Rule ID is  of variable length
>    - The RuleID field spans the Fport byte and a few following bits of
>    the LoRaWAN frame
>    - Only some values of the RuleID's most significant byte (=3DFport) ar=
e
>    allowed, namely  ...
>    - For each of these values, the RuleID is =E2=80=A6 bits long, the Rul=
e is
>    fragmentation or compression, etc =E2=80=A6
>
>
> Dominique
>
> De : lp-wan <lp-wan-bounces@ietf.org> on behalf of Laurent Toutain <
> laurent.toutain@imt-atlantique.fr>
> Date : Wednesday 5 June 2019 17:26
> =C3=80 : lp-wan <lp-wan@ietf.org>
> Objet : [lp-wan] SCHC over LoRaWAN review
>
> Dear Author,
>
> As discussed during the interim, you will find some comments on the schc
> over LoRAWAN draft. I like the approach, but I have some questions about
> the way it is done.
>
> - the draft should be more precise on the relation between FPort and
> RuleID. The first time I read the draft I thought that the FPort was the
> ruleID. What I understand after, tell me if it is true, the 3 FPort defin=
ed
> in the document are telling that the LoRaWAN PDU is a SCHC message.
> - the relation between compression and fragmentation is not clear. The
> introduction describes a lot the compression and the rest of the document
> gives only rules for fragmentation.
> if I understand well FPort 20 is for an implicit fragmentation rule and
> port 21 for any SCHC message starting with a ruleID. Why the document
> limits it to fragmentation?
>
> - I don't understand either the reason to have 3 byte long tiles, why a s=
o
> small value? Why for instance 6 cannot be used ?
>
> The rest of the comments are in the world file with comments (sorry for
> that, if it causes trouble I will translate it into ascii).
>
> Laurent
>
> _________________________________________________________________________=
________________________________________________
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>

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:verdana,=
sans-serif;color:#0b5394">Hello Laurent and Dominique,</div><div class=3D"g=
mail_default" style=3D"font-family:verdana,sans-serif;color:#0b5394"><br></=
div><div class=3D"gmail_default" style=3D"font-family:verdana,sans-serif;co=
lor:#0b5394">Thank you for your comments! I think we can add or edit some t=
ext to make those points clearer. My comments regarding your questions.</di=
v><div class=3D"gmail_default" style=3D"font-family:verdana,sans-serif;colo=
r:#0b5394"><br></div><div class=3D"gmail_default" style=3D"font-family:verd=
ana,sans-serif;color:#0b5394">- On your point about=C2=A0<i>relation betwee=
n FPort and RuleID</i>, I think that Dominique&#39;s proposition could inde=
ed make this part clearer.</div><div class=3D"gmail_default" style=3D"font-=
family:verdana,sans-serif;color:#0b5394"><br></div><div class=3D"gmail_defa=
ult" style=3D"font-family:verdana,sans-serif;color:#0b5394">- On your point=
 about=C2=A0<i>relation between compression and fragmentation, </i>we can a=
dd a bit more text about it, but our general idea was that compression depe=
nds much more on the specific scenario, so we are only providing the requir=
ed parameters for it and we leave it to the &lt;&lt;<i>user&gt;&gt;=C2=A0</=
i>=C2=A0to figure out the remaining details. This is why this part is much =
shorter and probably less detailed. The fragmentation is the part that seem=
ed the most likely source of interoperability issues and that is why most o=
f our efforts so far have been concentrated on it.</div><div class=3D"gmail=
_default" style=3D"font-family:verdana,sans-serif;color:#0b5394"><br></div>=
<div class=3D"gmail_default" style=3D"font-family:verdana,sans-serif;color:=
#0b5394">- While tile size of 6 could be used, the idea to have it only 3 b=
ytes long is that mac commands in FOpts can be placed, without affecting to=
o much the fragmentation. In addition, different payload sizes seem to fit =
well with this tile size. My guess is that only through observing real traf=
fic we will be able to select the best tile size for most cases. If you hav=
e reasons to believe that other tile size will be more appropriate, please =
let us know.</div><div class=3D"gmail_default" style=3D"font-family:verdana=
,sans-serif;color:#0b5394"><br></div><div class=3D"gmail_default" style=3D"=
font-family:verdana,sans-serif;color:#0b5394">Best regards,</div><div class=
=3D"gmail_default" style=3D"font-family:verdana,sans-serif;color:#0b5394"><=
br></div><div class=3D"gmail_default" style=3D"font-family:verdana,sans-ser=
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b style=3D"font-size:small;color:rgb(34,34,34)"><span style=3D"font-family:=
Arial"><font color=3D"#073763">Ivaylo Petrov</font></span></b><br></div><di=
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ine-height:normal;margin:0px;min-height:14px"><span style=3D"color:rgb(116,=
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/p><p style=3D"font-family:Helvetica;font-size:12px;font-stretch:normal;lin=
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</div></div></div></div></div></div></div></div><br><div class=3D"gmail_quo=
te"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, Jun 5, 2019 at 5:56 PM &l=
t;<a href=3D"mailto:dominique.barthel@orange.com" target=3D"_blank">dominiq=
ue.barthel@orange.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_qu=
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4);padding-left:1ex">



<div style=3D"color:rgb(0,0,0);font-size:14px;font-family:Calibri,sans-seri=
f">
<div>Hello Laurent,</div>
<div><br>
</div>
<div>Having discussed it with the authors, I feel I can answer some of your=
 questions.</div>
<div>The concatanation of the Fport byte and the few bits following constit=
ute the Rule ID. The number of &quot;few bits&quot; is variable based on th=
e first (Fport) byte, therefore we have a variable-length RuleID.</div>
<div>In order to be more in the spirit of the generic SCHC description draf=
t, I suggest that the RuleID be described in the schc-over-LoRaWAN draft th=
e following way</div>
<ul>
<li>The Rule ID is =C2=A0of=C2=A0variable length=C2=A0</li><li>The RuleID f=
ield spans the Fport byte and a few following bits of the LoRaWAN frame</li=
><li>Only some values of the RuleID&#39;s most significant byte (=3DFport) =
are allowed, namely =C2=A0...</li><li>For each of these values, the RuleID =
is =E2=80=A6 bits long, the Rule is fragmentation or compression, etc =E2=
=80=A6=C2=A0</li></ul>
<div><br>
</div>
<div>Dominique</div>
<div><br>
</div>
<span id=3D"gmail-m_4044588261858620479gmail-m_-2966700072084206250OLK_SRC_=
BODY_SECTION">
<div style=3D"font-family:Calibri;font-size:11pt;text-align:left;color:blac=
k;border-width:1pt medium medium;border-style:solid none none;border-bottom=
-color:initial;border-left-color:initial;padding:3pt 0in 0in;border-top-col=
or:rgb(181,196,223);border-right-color:initial">
<span style=3D"font-weight:bold">De=C2=A0: </span>lp-wan &lt;<a href=3D"mai=
lto:lp-wan-bounces@ietf.org" target=3D"_blank">lp-wan-bounces@ietf.org</a>&=
gt; on behalf of Laurent Toutain &lt;<a href=3D"mailto:laurent.toutain@imt-=
atlantique.fr" target=3D"_blank">laurent.toutain@imt-atlantique.fr</a>&gt;<=
br>
<span style=3D"font-weight:bold">Date=C2=A0: </span>Wednesday 5 June 2019 1=
7:26<br>
<span style=3D"font-weight:bold">=C3=80=C2=A0: </span>lp-wan &lt;<a href=3D=
"mailto:lp-wan@ietf.org" target=3D"_blank">lp-wan@ietf.org</a>&gt;<br>
<span style=3D"font-weight:bold">Objet=C2=A0: </span>[lp-wan] SCHC over LoR=
aWAN review<br>
</div>
<div><br>
</div>
<div>
<div>
<div dir=3D"ltr">
<div>Dear Author, <br>
</div>
<div><br>
</div>
<div>As discussed during the interim, you will find some comments on the sc=
hc over LoRAWAN draft. I like the approach, but I have some questions about=
 the way it is done.
<br>
</div>
<div><br>
</div>
<div>- the draft should be more precise on the relation between FPort and R=
uleID. The first time I read the draft I thought that the FPort was the rul=
eID. What I understand after, tell me if it is true, the 3 FPort defined in=
 the document are telling that the
 LoRaWAN PDU is a SCHC message. <br>
</div>
<div>- the relation between compression and fragmentation is not clear. The=
 introduction describes a lot the compression and the rest of the document =
gives only rules for fragmentation.
<br>
</div>
<div>if I understand well FPort 20 is for an implicit fragmentation rule an=
d port 21 for any SCHC message starting with a ruleID. Why the document lim=
its it to fragmentation?</div>
<div><br>
</div>
<div>- I don&#39;t understand either the reason to have 3 byte long tiles, =
why a so small value? Why for instance 6 cannot be used ?
<br>
</div>
<div><br>
</div>
<div>The rest of the comments are in the world file with comments (sorry fo=
r that, if it causes trouble I will translate it into ascii).
<br>
</div>
<div><br>
</div>
<div>Laurent<br>
</div>
</div>
</div>
</div>
</span>
<pre>______________________________________________________________________=
___________________________________________________

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Orange decline toute responsabilite si ce message a ete altere, deforme ou =
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they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
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Thank you.
</pre></div>

_______________________________________________<br>
lp-wan mailing list<br>
<a href=3D"mailto:lp-wan@ietf.org" target=3D"_blank">lp-wan@ietf.org</a><br=
>
<a href=3D"https://www.ietf.org/mailman/listinfo/lp-wan" rel=3D"noreferrer"=
 target=3D"_blank">https://www.ietf.org/mailman/listinfo/lp-wan</a><br>
</blockquote></div>

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From: Laurent Toutain <laurent.toutain@imt-atlantique.fr>
Date: Thu, 6 Jun 2019 12:00:24 +0200
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To: ivaylo petrov <ivaylo@ackl.io>
Cc: "BARTHEL Dominique IMT/OLPS" <dominique.barthel@orange.com>, lp-wan <lp-wan@ietf.org>, draft-ietf-lpwan-schc-over-lorawan@ietf.org
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Subject: Re: [lp-wan] SCHC over LoRaWAN review
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Hi Ivo,

On Thu, Jun 6, 2019 at 10:17 AM ivaylo petrov <ivaylo@ackl.io> wrote:

> Hello Laurent and Dominique,
>
> Thank you for your comments! I think we can add or edit some text to make
> those points clearer. My comments regarding your questions.
>
> - On your point about *relation between FPort and RuleID*, I think that
> Dominique's proposition could indeed make this part clearer.
>

Something like

FPort:RuleID ?

20: for the small one
21:RuleID for uplink
and
22:RuleID for downlink



> - On your point about *relation between compression and fragmentation, *w=
e
> can add a bit more text about it, but our general idea was that compressi=
on
> depends much more on the specific scenario, so we are only providing the
> required parameters for it and we leave it to the <<*user>> * to figure
> out the remaining details. This is why this part is much shorter and
> probably less detailed. The fragmentation is the part that seemed the mos=
t
> likely source of interoperability issues and that is why most of our
> efforts so far have been concentrated on it.
>
> ok

- While tile size of 6 could be used, the idea to have it only 3 bytes long
> is that mac commands in FOpts can be placed, without affecting too much t=
he
> fragmentation. In addition, different payload sizes seem to fit well with
> this tile size. My guess is that only through observing real traffic we
> will be able to select the best tile size for most cases. If you have
> reasons to believe that other tile size will be more appropriate, please
> let us know.
>
> No I was surprised by the value, but it is a good trade-off

Laurent

> Best regards,
>
>
> <https://ackl.io/>
> *Ivaylo Petrov*
>
> Chief Architect
>
> +33 2 22 06 05 77
>
> www.ackl.io
>
> [image: W3Schools] <https://www.linkedin.com/company/acklio/> [image:
> W3Schools] <https://twitter.com/acklio>
>
> The content of this email is confidential and intended for the recipient
> specified in message only.
>
> It is strictly forbidden to share any part of this message with any third
> party, without the written consent of the sender.
>
> If you received this message by mistake, please reply to this message and
> follow with its deletion, so that we can ensure
>
> On Wed, Jun 5, 2019 at 5:56 PM <dominique.barthel@orange.com> wrote:
>
>> Hello Laurent,
>>
>> Having discussed it with the authors, I feel I can answer some of your
>> questions.
>> The concatanation of the Fport byte and the few bits following constitut=
e
>> the Rule ID. The number of "few bits" is variable based on the first
>> (Fport) byte, therefore we have a variable-length RuleID.
>> In order to be more in the spirit of the generic SCHC description draft,
>> I suggest that the RuleID be described in the schc-over-LoRaWAN draft th=
e
>> following way
>>
>>    - The Rule ID is  of variable length
>>    - The RuleID field spans the Fport byte and a few following bits of
>>    the LoRaWAN frame
>>    - Only some values of the RuleID's most significant byte (=3DFport) a=
re
>>    allowed, namely  ...
>>    - For each of these values, the RuleID is =E2=80=A6 bits long, the Ru=
le is
>>    fragmentation or compression, etc =E2=80=A6
>>
>>
>> Dominique
>>
>> De : lp-wan <lp-wan-bounces@ietf.org> on behalf of Laurent Toutain <
>> laurent.toutain@imt-atlantique.fr>
>> Date : Wednesday 5 June 2019 17:26
>> =C3=80 : lp-wan <lp-wan@ietf.org>
>> Objet : [lp-wan] SCHC over LoRaWAN review
>>
>> Dear Author,
>>
>> As discussed during the interim, you will find some comments on the schc
>> over LoRAWAN draft. I like the approach, but I have some questions about
>> the way it is done.
>>
>> - the draft should be more precise on the relation between FPort and
>> RuleID. The first time I read the draft I thought that the FPort was the
>> ruleID. What I understand after, tell me if it is true, the 3 FPort defi=
ned
>> in the document are telling that the LoRaWAN PDU is a SCHC message.
>> - the relation between compression and fragmentation is not clear. The
>> introduction describes a lot the compression and the rest of the documen=
t
>> gives only rules for fragmentation.
>> if I understand well FPort 20 is for an implicit fragmentation rule and
>> port 21 for any SCHC message starting with a ruleID. Why the document
>> limits it to fragmentation?
>>
>> - I don't understand either the reason to have 3 byte long tiles, why a
>> so small value? Why for instance 6 cannot be used ?
>>
>> The rest of the comments are in the world file with comments (sorry for
>> that, if it causes trouble I will translate it into ascii).
>>
>> Laurent
>>
>> ________________________________________________________________________=
_________________________________________________
>>
>> Ce message et ses pieces jointes peuvent contenir des informations confi=
dentielles ou privilegiees et ne doivent donc
>> pas etre diffuses, exploites ou copies sans autorisation. Si vous avez r=
ecu ce message par erreur, veuillez le signaler
>> a l'expediteur et le detruire ainsi que les pieces jointes. Les messages=
 electroniques etant susceptibles d'alteration,
>> Orange decline toute responsabilite si ce message a ete altere, deforme =
ou falsifie. Merci.
>>
>> This message and its attachments may contain confidential or privileged =
information that may be protected by law;
>> they should not be distributed, used or copied without authorisation.
>> If you have received this email in error, please notify the sender and d=
elete this message and its attachments.
>> As emails may be altered, Orange is not liable for messages that have be=
en modified, changed or falsified.
>> Thank you.
>>
>> _______________________________________________
>> lp-wan mailing list
>> lp-wan@ietf.org
>> https://www.ietf.org/mailman/listinfo/lp-wan
>>
>

--00000000000098c0f3058aa4ca5c
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<div dir=3D"ltr"><div dir=3D"ltr">Hi Ivo,<br></div><br><div class=3D"gmail_=
quote"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, Jun 6, 2019 at 10:17 A=
M ivaylo petrov &lt;<a href=3D"mailto:ivaylo@ackl.io">ivaylo@ackl.io</a>&gt=
; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px=
 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div di=
r=3D"ltr"><div style=3D"font-family:verdana,sans-serif;color:rgb(11,83,148)=
">Hello Laurent and Dominique,</div><div style=3D"font-family:verdana,sans-=
serif;color:rgb(11,83,148)"><br></div><div style=3D"font-family:verdana,san=
s-serif;color:rgb(11,83,148)">Thank you for your comments! I think we can a=
dd or edit some text to make those points clearer. My comments regarding yo=
ur questions.</div><div style=3D"font-family:verdana,sans-serif;color:rgb(1=
1,83,148)"><br></div><div style=3D"font-family:verdana,sans-serif;color:rgb=
(11,83,148)">- On your point about=C2=A0<i>relation between FPort and RuleI=
D</i>, I think that Dominique&#39;s proposition could indeed make this part=
 clearer.</div></div></blockquote><div><br></div><div>Something like</div><=
div><br></div><div>FPort:RuleID ?</div><div><br></div><div>20: for the smal=
l one</div><div>21:RuleID for uplink <br></div><div>and</div><div>22:RuleID=
 for downlink <br></div><div><br></div><div><br></div><blockquote class=3D"=
gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(20=
4,204,204);padding-left:1ex"><div dir=3D"ltr"><div style=3D"font-family:ver=
dana,sans-serif;color:rgb(11,83,148)"><br></div><div style=3D"font-family:v=
erdana,sans-serif;color:rgb(11,83,148)">- On your point about=C2=A0<i>relat=
ion between compression and fragmentation, </i>we can add a bit more text a=
bout it, but our general idea was that compression depends much more on the=
 specific scenario, so we are only providing the required parameters for it=
 and we leave it to the &lt;&lt;<i>user&gt;&gt;=C2=A0</i>=C2=A0to figure ou=
t the remaining details. This is why this part is much shorter and probably=
 less detailed. The fragmentation is the part that seemed the most likely s=
ource of interoperability issues and that is why most of our efforts so far=
 have been concentrated on it.</div><div style=3D"font-family:verdana,sans-=
serif;color:rgb(11,83,148)"><br></div></div></blockquote><div>ok<br></div><=
div> <br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0p=
x 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=
=3D"ltr"><div style=3D"font-family:verdana,sans-serif;color:rgb(11,83,148)"=
></div><div style=3D"font-family:verdana,sans-serif;color:rgb(11,83,148)">-=
 While tile size of 6 could be used, the idea to have it only 3 bytes long =
is that mac commands in FOpts can be placed, without affecting too much the=
 fragmentation. In addition, different payload sizes seem to fit well with =
this tile size. My guess is that only through observing real traffic we wil=
l be able to select the best tile size for most cases. If you have reasons =
to believe that other tile size will be more appropriate, please let us kno=
w.</div><div style=3D"font-family:verdana,sans-serif;color:rgb(11,83,148)">=
<br></div></div></blockquote><div>No I was surprised by the value, but it i=
s a good trade-off</div><div><br></div><div>Laurent<br></div><blockquote cl=
ass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid=
 rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr"><div style=3D"font-fam=
ily:verdana,sans-serif;color:rgb(11,83,148)"></div><div style=3D"font-famil=
y:verdana,sans-serif;color:rgb(11,83,148)">Best regards,</div><div style=3D=
"font-family:verdana,sans-serif;color:rgb(11,83,148)"><br></div><div style=
=3D"font-family:verdana,sans-serif;color:rgb(11,83,148)"><br></div><div sty=
le=3D"font-family:verdana,sans-serif;color:rgb(11,83,148)"><div style=3D"fo=
nt-size:12px;color:rgb(0,0,0);font-family:Helvetica"><a href=3D"https://ack=
l.io/" target=3D"_blank"><img src=3D"https://uploads-ssl.webflow.com/5c4b13=
0029e0ba2325776fc5/5cc98928d54687230176b9ae_Acklio_minilogo.jpg" width=3D"9=
6" height=3D"30"></a></div><div style=3D"font-size:12px;color:rgb(0,0,0);fo=
nt-family:Helvetica"><b style=3D"font-size:small;color:rgb(34,34,34)"><span=
 style=3D"font-family:Arial"><font color=3D"#073763">Ivaylo Petrov</font></=
span></b><br></div><div style=3D"color:rgb(34,34,34);font-family:Arial,Helv=
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;font-stretch:normal;line-height:normal;margin:0px;min-height:14px"><span s=
tyle=3D"color:rgb(116,116,116);font-family:Arial;font-size:small">+33 2 22 =
06 05 77=C2=A0</span></p><p style=3D"font-family:Helvetica;font-size:12px;f=
ont-stretch:normal;line-height:normal;margin:0px;min-height:14px"><a href=
=3D"http://www.ackl.io/" style=3D"font-family:Arial;font-size:12.8px" targe=
t=3D"_blank"><font size=3D"2" color=3D"#0b5394">www.ackl.io</font></a></p><=
p style=3D"color:rgb(0,0,0);font-family:Helvetica;font-size:12px"><a href=
=3D"https://www.linkedin.com/company/acklio/" target=3D"_blank"><img alt=3D=
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</div></div></div></div></div></div></div></div></div></div></div></div><br=
><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, J=
un 5, 2019 at 5:56 PM &lt;<a href=3D"mailto:dominique.barthel@orange.com" t=
arget=3D"_blank">dominique.barthel@orange.com</a>&gt; wrote:<br></div><bloc=
kquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:=
1px solid rgb(204,204,204);padding-left:1ex">



<div style=3D"color:rgb(0,0,0);font-size:14px;font-family:Calibri,sans-seri=
f">
<div>Hello Laurent,</div>
<div><br>
</div>
<div>Having discussed it with the authors, I feel I can answer some of your=
 questions.</div>
<div>The concatanation of the Fport byte and the few bits following constit=
ute the Rule ID. The number of &quot;few bits&quot; is variable based on th=
e first (Fport) byte, therefore we have a variable-length RuleID.</div>
<div>In order to be more in the spirit of the generic SCHC description draf=
t, I suggest that the RuleID be described in the schc-over-LoRaWAN draft th=
e following way</div>
<ul>
<li>The Rule ID is =C2=A0of=C2=A0variable length=C2=A0</li><li>The RuleID f=
ield spans the Fport byte and a few following bits of the LoRaWAN frame</li=
><li>Only some values of the RuleID&#39;s most significant byte (=3DFport) =
are allowed, namely =C2=A0...</li><li>For each of these values, the RuleID =
is =E2=80=A6 bits long, the Rule is fragmentation or compression, etc =E2=
=80=A6=C2=A0</li></ul>
<div><br>
</div>
<div>Dominique</div>
<div><br>
</div>
<span id=3D"gmail-m_-6330813323111580209gmail-m_4044588261858620479gmail-m_=
-2966700072084206250OLK_SRC_BODY_SECTION">
<div style=3D"font-family:Calibri;font-size:11pt;text-align:left;color:blac=
k;border-width:1pt medium medium;border-style:solid none none;border-bottom=
-color:initial;border-left-color:initial;padding:3pt 0in 0in;border-top:1pt=
 solid rgb(181,196,223);border-right-color:initial">
<span style=3D"font-weight:bold">De=C2=A0: </span>lp-wan &lt;<a href=3D"mai=
lto:lp-wan-bounces@ietf.org" target=3D"_blank">lp-wan-bounces@ietf.org</a>&=
gt; on behalf of Laurent Toutain &lt;<a href=3D"mailto:laurent.toutain@imt-=
atlantique.fr" target=3D"_blank">laurent.toutain@imt-atlantique.fr</a>&gt;<=
br>
<span style=3D"font-weight:bold">Date=C2=A0: </span>Wednesday 5 June 2019 1=
7:26<br>
<span style=3D"font-weight:bold">=C3=80=C2=A0: </span>lp-wan &lt;<a href=3D=
"mailto:lp-wan@ietf.org" target=3D"_blank">lp-wan@ietf.org</a>&gt;<br>
<span style=3D"font-weight:bold">Objet=C2=A0: </span>[lp-wan] SCHC over LoR=
aWAN review<br>
</div>
<div><br>
</div>
<div>
<div>
<div dir=3D"ltr">
<div>Dear Author, <br>
</div>
<div><br>
</div>
<div>As discussed during the interim, you will find some comments on the sc=
hc over LoRAWAN draft. I like the approach, but I have some questions about=
 the way it is done.
<br>
</div>
<div><br>
</div>
<div>- the draft should be more precise on the relation between FPort and R=
uleID. The first time I read the draft I thought that the FPort was the rul=
eID. What I understand after, tell me if it is true, the 3 FPort defined in=
 the document are telling that the
 LoRaWAN PDU is a SCHC message. <br>
</div>
<div>- the relation between compression and fragmentation is not clear. The=
 introduction describes a lot the compression and the rest of the document =
gives only rules for fragmentation.
<br>
</div>
<div>if I understand well FPort 20 is for an implicit fragmentation rule an=
d port 21 for any SCHC message starting with a ruleID. Why the document lim=
its it to fragmentation?</div>
<div><br>
</div>
<div>- I don&#39;t understand either the reason to have 3 byte long tiles, =
why a so small value? Why for instance 6 cannot be used ?
<br>
</div>
<div><br>
</div>
<div>The rest of the comments are in the world file with comments (sorry fo=
r that, if it causes trouble I will translate it into ascii).
<br>
</div>
<div><br>
</div>
<div>Laurent<br>
</div>
</div>
</div>
</div>
</span>
<pre>______________________________________________________________________=
___________________________________________________

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pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l&#39;expediteur et le detruire ainsi que les pieces jointes. Les message=
s electroniques etant susceptibles d&#39;alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.
Thank you.
</pre></div>

_______________________________________________<br>
lp-wan mailing list<br>
<a href=3D"mailto:lp-wan@ietf.org" target=3D"_blank">lp-wan@ietf.org</a><br=
>
<a href=3D"https://www.ietf.org/mailman/listinfo/lp-wan" rel=3D"noreferrer"=
 target=3D"_blank">https://www.ietf.org/mailman/listinfo/lp-wan</a><br>
</blockquote></div>
</blockquote></div></div>

--00000000000098c0f3058aa4ca5c--


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From: <dominique.barthel@orange.com>
To: ivaylo petrov <ivaylo@ackl.io>, Laurent Toutain <laurent.toutain@imt-atlantique.fr>
CC: lp-wan <lp-wan@ietf.org>, "draft-ietf-lpwan-schc-over-lorawan@ietf.org" <draft-ietf-lpwan-schc-over-lorawan@ietf.org>
Thread-Topic: [lp-wan] SCHC over LoRaWAN review
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--_000_D91EA46461F93dominiquebarthelorangecom_
Content-Type: text/plain; charset="Windows-1252"
Content-Transfer-Encoding: quoted-printable

Hello all,

Discussing it with Laurent yesterday night, we were wondering if it makes s=
ense to specify in this document the number of Rules allowed for compressio=
n.
Application of SCHC to LoRaWN (or to any Layer 2) is mostly a fragmentation=
 issue.
Compression is mostly about applying SCHC to upper-layer protocols, which i=
s outside the scope of this document.
Therefore, why not reserve in this document the upper part of the compressi=
on Rule Ids and leave it open to the "upper-layer-over-SCHC" document to sp=
ecify how many Rules are needed for compression?
Best regards

Dominique


De : ivaylo petrov <ivaylo@ackl.io<mailto:ivaylo@ackl.io>>
Date : Thursday 6 June 2019 10:16
=C0 : Laurent Toutain <laurent.toutain@imt-atlantique.fr<mailto:laurent.tou=
tain@imt-atlantique.fr>>, Dominique Barthel <dominique.barthel@orange.com<m=
ailto:dominique.barthel@orange.com>>
Cc : lp-wan <lp-wan@ietf.org<mailto:lp-wan@ietf.org>>, "draft-ietf-lpwan-sc=
hc-over-lorawan@ietf.org<mailto:draft-ietf-lpwan-schc-over-lorawan@ietf.org=
>" <draft-ietf-lpwan-schc-over-lorawan@ietf.org<mailto:draft-ietf-lpwan-sch=
c-over-lorawan@ietf.org>>
Objet : Re: [lp-wan] SCHC over LoRaWAN review

Hello Laurent and Dominique,

Thank you for your comments! I think we can add or edit some text to make t=
hose points clearer. My comments regarding your questions.

- On your point about relation between FPort and RuleID, I think that Domin=
ique's proposition could indeed make this part clearer.

- On your point about relation between compression and fragmentation, we ca=
n add a bit more text about it, but our general idea was that compression d=
epends much more on the specific scenario, so we are only providing the req=
uired parameters for it and we leave it to the <<user>>  to figure out the =
remaining details. This is why this part is much shorter and probably less =
detailed. The fragmentation is the part that seemed the most likely source =
of interoperability issues and that is why most of our efforts so far have =
been concentrated on it.

- While tile size of 6 could be used, the idea to have it only 3 bytes long=
 is that mac commands in FOpts can be placed, without affecting too much th=
e fragmentation. In addition, different payload sizes seem to fit well with=
 this tile size. My guess is that only through observing real traffic we wi=
ll be able to select the best tile size for most cases. If you have reasons=
 to believe that other tile size will be more appropriate, please let us kn=
ow.

Best regards,


[https://uploads-ssl.webflow.com/5c4b130029e0ba2325776fc5/5cc98928d54687230=
176b9ae_Acklio_minilogo.jpg]<https://ackl.io/>
Ivaylo Petrov

Chief Architect

+33 2 22 06 05 77

www.ackl.io<http://www.ackl.io/>

[W3Schools]<https://www.linkedin.com/company/acklio/> [W3Schools] <https://=
twitter.com/acklio>

The content of this email is confidential and intended for the recipient sp=
ecified in message only.

It is strictly forbidden to share any part of this message with any third p=
arty, without the written consent of the sender.

If you received this message by mistake, please reply to this message and f=
ollow with its deletion, so that we can ensure

On Wed, Jun 5, 2019 at 5:56 PM <dominique.barthel@orange.com<mailto:dominiq=
ue.barthel@orange.com>> wrote:
Hello Laurent,

Having discussed it with the authors, I feel I can answer some of your ques=
tions.
The concatanation of the Fport byte and the few bits following constitute t=
he Rule ID. The number of "few bits" is variable based on the first (Fport)=
 byte, therefore we have a variable-length RuleID.
In order to be more in the spirit of the generic SCHC description draft, I =
suggest that the RuleID be described in the schc-over-LoRaWAN draft the fol=
lowing way

  *   The Rule ID is  of variable length
  *   The RuleID field spans the Fport byte and a few following bits of the=
 LoRaWAN frame
  *   Only some values of the RuleID's most significant byte (=3DFport) are=
 allowed, namely  ...
  *   For each of these values, the RuleID is =85 bits long, the Rule is fr=
agmentation or compression, etc =85

Dominique

De : lp-wan <lp-wan-bounces@ietf.org<mailto:lp-wan-bounces@ietf.org>> on be=
half of Laurent Toutain <laurent.toutain@imt-atlantique.fr<mailto:laurent.t=
outain@imt-atlantique.fr>>
Date : Wednesday 5 June 2019 17:26
=C0 : lp-wan <lp-wan@ietf.org<mailto:lp-wan@ietf.org>>
Objet : [lp-wan] SCHC over LoRaWAN review

Dear Author,

As discussed during the interim, you will find some comments on the schc ov=
er LoRAWAN draft. I like the approach, but I have some questions about the =
way it is done.

- the draft should be more precise on the relation between FPort and RuleID=
. The first time I read the draft I thought that the FPort was the ruleID. =
What I understand after, tell me if it is true, the 3 FPort defined in the =
document are telling that the LoRaWAN PDU is a SCHC message.
- the relation between compression and fragmentation is not clear. The intr=
oduction describes a lot the compression and the rest of the document gives=
 only rules for fragmentation.
if I understand well FPort 20 is for an implicit fragmentation rule and por=
t 21 for any SCHC message starting with a ruleID. Why the document limits i=
t to fragmentation?

- I don't understand either the reason to have 3 byte long tiles, why a so =
small value? Why for instance 6 cannot be used ?

The rest of the comments are in the world file with comments (sorry for tha=
t, if it causes trouble I will translate it into ascii).

Laurent

___________________________________________________________________________=
______________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el=
ectroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.
Thank you.


_______________________________________________
lp-wan mailing list
lp-wan@ietf.org<mailto:lp-wan@ietf.org>
https://www.ietf.org/mailman/listinfo/lp-wan

___________________________________________________________________________=
______________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el=
ectroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
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they should not be distributed, used or copied without authorisation.
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te this message and its attachments.
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modified, changed or falsified.
Thank you.


--_000_D91EA46461F93dominiquebarthelorangecom_
Content-Type: text/html; charset="Windows-1252"
Content-ID: <4948DAC4236D1949B73D462EDF0FCDEC@adroot.infra.ftgroup>
Content-Transfer-Encoding: quoted-printable

<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DWindows-1=
252">
</head>
<body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-lin=
e-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-fami=
ly: Calibri, sans-serif;">
<div>Hello all,</div>
<div><br>
</div>
<div>Discussing it with Laurent yesterday night, we were wondering if it ma=
kes sense to specify in this document the number of Rules allowed for compr=
ession.</div>
<div>Application of SCHC to LoRaWN (or to any Layer 2) is mostly a fragment=
ation issue.</div>
<div>Compression is mostly about applying SCHC to upper-layer protocols, wh=
ich is outside the scope of this document.</div>
<div>Therefore, why not reserve in this document the upper part of the comp=
ression Rule Ids and leave it open to the &quot;upper-layer-over-SCHC&quot;=
 document to specify how many Rules are needed for compression?</div>
<div>Best regards</div>
<div><br>
</div>
<div>Dominique&nbsp;</div>
<div><br>
</div>
<div><br>
</div>
<span id=3D"OLK_SRC_BODY_SECTION">
<div style=3D"font-family:Calibri; font-size:11pt; text-align:left; color:b=
lack; BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM:=
 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid;=
 BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<span style=3D"font-weight:bold">De&nbsp;: </span>ivaylo petrov &lt;<a href=
=3D"mailto:ivaylo@ackl.io">ivaylo@ackl.io</a>&gt;<br>
<span style=3D"font-weight:bold">Date&nbsp;: </span>Thursday 6 June 2019 10=
:16<br>
<span style=3D"font-weight:bold">=C0&nbsp;: </span>Laurent Toutain &lt;<a h=
ref=3D"mailto:laurent.toutain@imt-atlantique.fr">laurent.toutain@imt-atlant=
ique.fr</a>&gt;, Dominique Barthel &lt;<a href=3D"mailto:dominique.barthel@=
orange.com">dominique.barthel@orange.com</a>&gt;<br>
<span style=3D"font-weight:bold">Cc&nbsp;: </span>lp-wan &lt;<a href=3D"mai=
lto:lp-wan@ietf.org">lp-wan@ietf.org</a>&gt;, &quot;<a href=3D"mailto:draft=
-ietf-lpwan-schc-over-lorawan@ietf.org">draft-ietf-lpwan-schc-over-lorawan@=
ietf.org</a>&quot; &lt;<a href=3D"mailto:draft-ietf-lpwan-schc-over-lorawan=
@ietf.org">draft-ietf-lpwan-schc-over-lorawan@ietf.org</a>&gt;<br>
<span style=3D"font-weight:bold">Objet&nbsp;: </span>Re: [lp-wan] SCHC over=
 LoRaWAN review<br>
</div>
<div><br>
</div>
<div>
<div>
<div dir=3D"ltr">
<div class=3D"gmail_default" style=3D"font-family:verdana,sans-serif;color:=
#0b5394">Hello Laurent and Dominique,</div>
<div class=3D"gmail_default" style=3D"font-family:verdana,sans-serif;color:=
#0b5394"><br>
</div>
<div class=3D"gmail_default" style=3D"font-family:verdana,sans-serif;color:=
#0b5394">Thank you for your comments! I think we can add or edit some text =
to make those points clearer. My comments regarding your questions.</div>
<div class=3D"gmail_default" style=3D"font-family:verdana,sans-serif;color:=
#0b5394"><br>
</div>
<div class=3D"gmail_default" style=3D"font-family:verdana,sans-serif;color:=
#0b5394">- On your point about&nbsp;<i>relation between FPort and RuleID</i=
>, I think that Dominique's proposition could indeed make this part clearer=
.</div>
<div class=3D"gmail_default" style=3D"font-family:verdana,sans-serif;color:=
#0b5394"><br>
</div>
<div class=3D"gmail_default" style=3D"font-family:verdana,sans-serif;color:=
#0b5394">- On your point about&nbsp;<i>relation between compression and fra=
gmentation,
</i>we can add a bit more text about it, but our general idea was that comp=
ression depends much more on the specific scenario, so we are only providin=
g the required parameters for it and we leave it to the &lt;&lt;<i>user&gt;=
&gt;&nbsp;</i>&nbsp;to figure out the remaining details.
 This is why this part is much shorter and probably less detailed. The frag=
mentation is the part that seemed the most likely source of interoperabilit=
y issues and that is why most of our efforts so far have been concentrated =
on it.</div>
<div class=3D"gmail_default" style=3D"font-family:verdana,sans-serif;color:=
#0b5394"><br>
</div>
<div class=3D"gmail_default" style=3D"font-family:verdana,sans-serif;color:=
#0b5394">- While tile size of 6 could be used, the idea to have it only 3 b=
ytes long is that mac commands in FOpts can be placed, without affecting to=
o much the fragmentation. In addition,
 different payload sizes seem to fit well with this tile size. My guess is =
that only through observing real traffic we will be able to select the best=
 tile size for most cases. If you have reasons to believe that other tile s=
ize will be more appropriate, please
 let us know.</div>
<div class=3D"gmail_default" style=3D"font-family:verdana,sans-serif;color:=
#0b5394"><br>
</div>
<div class=3D"gmail_default" style=3D"font-family:verdana,sans-serif;color:=
#0b5394">Best regards,</div>
<div class=3D"gmail_default" style=3D"font-family:verdana,sans-serif;color:=
#0b5394"><br>
</div>
<div class=3D"gmail_default" style=3D"font-family:verdana,sans-serif;color:=
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</div>
<div class=3D"gmail_default" style=3D"font-family:verdana,sans-serif;color:=
#0b5394">
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<div class=3D"gmail_quote">
<div dir=3D"ltr" class=3D"gmail_attr">On Wed, Jun 5, 2019 at 5:56 PM &lt;<a=
 href=3D"mailto:dominique.barthel@orange.com" target=3D"_blank">dominique.b=
arthel@orange.com</a>&gt; wrote:<br>
</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left:1px solid rgb(204,204,204);padding-left:1ex">
<div style=3D"color:rgb(0,0,0);font-size:14px;font-family:Calibri,sans-seri=
f">
<div>Hello Laurent,</div>
<div><br>
</div>
<div>Having discussed it with the authors, I feel I can answer some of your=
 questions.</div>
<div>The concatanation of the Fport byte and the few bits following constit=
ute the Rule ID. The number of &quot;few bits&quot; is variable based on th=
e first (Fport) byte, therefore we have a variable-length RuleID.</div>
<div>In order to be more in the spirit of the generic SCHC description draf=
t, I suggest that the RuleID be described in the schc-over-LoRaWAN draft th=
e following way</div>
<ul>
<li>The Rule ID is &nbsp;of&nbsp;variable length&nbsp;</li><li>The RuleID f=
ield spans the Fport byte and a few following bits of the LoRaWAN frame</li=
><li>Only some values of the RuleID's most significant byte (=3DFport) are =
allowed, namely &nbsp;...</li><li>For each of these values, the RuleID is =
=85 bits long, the Rule is fragmentation or compression, etc =85&nbsp;</li>=
</ul>
<div><br>
</div>
<div>Dominique</div>
<div><br>
</div>
<span id=3D"gmail-m_4044588261858620479gmail-m_-2966700072084206250OLK_SRC_=
BODY_SECTION">
<div style=3D"font-family:Calibri;font-size:11pt;text-align:left;color:blac=
k;border-width:1pt medium medium;border-style:solid none none;border-bottom=
-color:initial;border-left-color:initial;padding:3pt 0in 0in;border-top-col=
or:rgb(181,196,223);border-right-color:initial">
<span style=3D"font-weight:bold">De&nbsp;: </span>lp-wan &lt;<a href=3D"mai=
lto:lp-wan-bounces@ietf.org" target=3D"_blank">lp-wan-bounces@ietf.org</a>&=
gt; on behalf of Laurent Toutain &lt;<a href=3D"mailto:laurent.toutain@imt-=
atlantique.fr" target=3D"_blank">laurent.toutain@imt-atlantique.fr</a>&gt;<=
br>
<span style=3D"font-weight:bold">Date&nbsp;: </span>Wednesday 5 June 2019 1=
7:26<br>
<span style=3D"font-weight:bold">=C0&nbsp;: </span>lp-wan &lt;<a href=3D"ma=
ilto:lp-wan@ietf.org" target=3D"_blank">lp-wan@ietf.org</a>&gt;<br>
<span style=3D"font-weight:bold">Objet&nbsp;: </span>[lp-wan] SCHC over LoR=
aWAN review<br>
</div>
<div><br>
</div>
<div>
<div>
<div dir=3D"ltr">
<div>Dear Author, <br>
</div>
<div><br>
</div>
<div>As discussed during the interim, you will find some comments on the sc=
hc over LoRAWAN draft. I like the approach, but I have some questions about=
 the way it is done.
<br>
</div>
<div><br>
</div>
<div>- the draft should be more precise on the relation between FPort and R=
uleID. The first time I read the draft I thought that the FPort was the rul=
eID. What I understand after, tell me if it is true, the 3 FPort defined in=
 the document are telling that the
 LoRaWAN PDU is a SCHC message. <br>
</div>
<div>- the relation between compression and fragmentation is not clear. The=
 introduction describes a lot the compression and the rest of the document =
gives only rules for fragmentation.
<br>
</div>
<div>if I understand well FPort 20 is for an implicit fragmentation rule an=
d port 21 for any SCHC message starting with a ruleID. Why the document lim=
its it to fragmentation?</div>
<div><br>
</div>
<div>- I don't understand either the reason to have 3 byte long tiles, why =
a so small value? Why for instance 6 cannot be used ?
<br>
</div>
<div><br>
</div>
<div>The rest of the comments are in the world file with comments (sorry fo=
r that, if it causes trouble I will translate it into ascii).
<br>
</div>
<div><br>
</div>
<div>Laurent<br>
</div>
</div>
</div>
</div>
</span>
<pre>______________________________________________________________________=
___________________________________________________

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Orange decline toute responsabilite si ce message a ete altere, deforme ou =
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</pre>
</div>
_______________________________________________<br>
lp-wan mailing list<br>
<a href=3D"mailto:lp-wan@ietf.org" target=3D"_blank">lp-wan@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lp-wan" rel=3D"noreferrer"=
 target=3D"_blank">https://www.ietf.org/mailman/listinfo/lp-wan</a><br>
</blockquote>
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</span>
<PRE>______________________________________________________________________=
___________________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
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 ce message par erreur, veuillez le signaler
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Orange decline toute responsabilite si ce message a ete altere, deforme ou =
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This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
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Thank you.
</PRE></body>
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--_000_D91EA46461F93dominiquebarthelorangecom_--


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Dear all,

Due to absence of several key contributors and a relatively light agenda,
we are cancelling tomorrow's meeting.

Our next interim is as scheduled on June 26.
Please note that this will be our last interim before the draft cut-off
date.

Cheers,
Pascal and Alexander

--000000000000336a2c058b07d209
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Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Dear all,<div><br></div><div>Due to absence of several key=
 contributors and a relatively light agenda, we are cancelling tomorrow&#39=
;s meeting.</div><div><br></div><div>Our next interim is as scheduled on Ju=
ne 26.</div><div>Please note that this will be our last interim before the =
draft cut-off date.</div><div><br></div><div>Cheers,</div><div>Pascal and A=
lexander</div><div><br></div><div><br></div></div>

--000000000000336a2c058b07d209--


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From: Laurent Toutain <laurent.toutain@imt-atlantique.fr>
Date: Tue, 11 Jun 2019 16:16:13 +0200
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To: Thomas Fossati <tho.ietf@gmail.com>
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Subject: Re: [lp-wan] [core] Fwd: New Version Notification for draft-ietf-lpwan-coap-static-context-hc-08.txt
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Hi Thomas,


Thank you for your comments and changes in the github.

On Thu, May 30, 2019 at 1:53 PM Thomas Fossati <tho.ietf@gmail.com> wrote:

> Hi Laurent,
>
> On Wed, May 29, 2019 at 6:56 PM Laurent Toutain
> <laurent.toutain@imt-atlantique.fr> wrote:
> > We have issued a new version of the SCHC coap compression
> > to remove an artifact due to a bad github manipulation.
>

> I have taken a look at the draft but since I cannot claim compression
> expertise I will only provide a couple of high level comments:
> - Sec 3: "a proxy placed before the compressor may change some field
> value".  You should qualify the "proxy" as a "CoAP proxy, explicitly
> selected by the client" to avoid any ambiguity -- we certainly don't
> want to recommend middle-box interference :-)
>

Yes CoAP proxy.


> - Sec 4.1: "This field is bidirectional and MUST be elided during the
> SCHC compression". This is a dangerous statement as it leads us
> straight into CoAP ossification territory.  If you want SCHC to work
> with CoAP v1 only what you really want to say here is "SHCH
> compression MUST NOT be applied to CoAP packets with version different
> from v1".  Granted that, a SCHC box deployed today could sit in the
> field happily ever after.  If not, when a new CoAP version is rolled
> out, endpoints wouldn=E2=80=99t be able to use this new version on any pa=
th
> crossing an SCHC box.
>

We don't think this will create ossification. The rule is very flexible and
do not force to elide this field at any time. For instance, if you have a
device that is CoAP v1 only, then you can elide the field.

During a transition period if the device accepts CoAP v1 and v2, then the
rule can be
set to MO=3Dignore and CDA=3Dvalue-sent. Or a rule for v1 and a rule for v2=
 can
be used.
In anycase the device will receive the appropriate CoAP version after
decompression.

Laurent and Ana


>
> Cheers!
>
> _______________________________________________
> lp-wan mailing list
> lp-wan@ietf.org
> https://www.ietf.org/mailman/listinfo/lp-wan
>

--000000000000ad8e45058b0cf255
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<div dir=3D"ltr"><div dir=3D"ltr"><div>Hi Thomas,</div><div><br></div></div=
><br><div>Thank you for your comments and changes in the github.</div><br><=
div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, May=
 30, 2019 at 1:53 PM Thomas Fossati &lt;<a href=3D"mailto:tho.ietf@gmail.co=
m">tho.ietf@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_qu=
ote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,20=
4);padding-left:1ex">Hi Laurent,<br>
<br>
On Wed, May 29, 2019 at 6:56 PM Laurent Toutain<br>
&lt;<a href=3D"mailto:laurent.toutain@imt-atlantique.fr" target=3D"_blank">=
laurent.toutain@imt-atlantique.fr</a>&gt; wrote:<br>
&gt; We have issued a new version of the SCHC coap compression<br>
&gt; to remove an artifact due to a bad github manipulation. <br></blockquo=
te><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;bord=
er-left:1px solid rgb(204,204,204);padding-left:1ex">
<br>
I have taken a look at the draft but since I cannot claim compression<br>
expertise I will only provide a couple of high level comments:<br>
- Sec 3: &quot;a proxy placed before the compressor may change some field<b=
r>
value&quot;.=C2=A0 You should qualify the &quot;proxy&quot; as a &quot;CoAP=
 proxy, explicitly<br>
selected by the client&quot; to avoid any ambiguity -- we certainly don&#39=
;t<br>
want to recommend middle-box interference :-)<br></blockquote><div><br></di=
v><div><div><span class=3D"gmail-gr_ gmail-gr_35 gmail-gr-alert gmail-gr_gr=
amm gmail-gr_inline_cards gmail-gr_run_anim gmail-Punctuation gmail-only-in=
s gmail-replaceWithoutSep" id=3D"gmail-35">Yes</span> CoAP proxy.</div>=C2=
=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8e=
x;border-left:1px solid rgb(204,204,204);padding-left:1ex">
- Sec 4.1: &quot;This field is bidirectional and MUST be elided during the<=
br>
SCHC compression&quot;. This is a dangerous statement as it leads us<br>
straight into CoAP ossification territory.=C2=A0 If you want SCHC to work<b=
r>
with CoAP v1 only what you really want to say here is &quot;SHCH<br>
compression MUST NOT be applied to CoAP packets with version different<br>
from v1&quot;.=C2=A0 Granted that, a SCHC box deployed today could sit in t=
he<br>
field happily ever after.=C2=A0 If not, when a new CoAP version is rolled<b=
r>
out, endpoints wouldn=E2=80=99t be able to use this new version on any path=
<br>
crossing an SCHC box.<br></blockquote><div><br></div><div><div>We don&#39;t=
 think this will create ossification. The rule is very flexible and <span c=
lass=3D"gmail-gr_ gmail-gr_39 gmail-gr-alert gmail-gr_gramm gmail-gr_inline=
_cards gmail-gr_run_anim gmail-Grammar gmail-multiReplace" id=3D"gmail-39">=
do</span>
 not force to elide this field at any time. For instance, if you have a=20
device that is CoAP v1 only, then you can elide the field. <br></div><div><=
br></div><div>During a transition period if the device accepts CoAP v1 and =
v2, then the rule can be <br></div><div>set to MO=3Dignore and CDA=3Dvalue-=
sent. Or a rule for v1 and a rule for v2 can be used.</div><div>In anycase =
the device will receive the appropriate CoAP version after decompression.<b=
r></div><div><br></div><div>Laurent and Ana</div>=C2=A0</div><blockquote cl=
ass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid=
 rgb(204,204,204);padding-left:1ex">
<br>
Cheers!<br>
<br>
_______________________________________________<br>
lp-wan mailing list<br>
<a href=3D"mailto:lp-wan@ietf.org" target=3D"_blank">lp-wan@ietf.org</a><br=
>
<a href=3D"https://www.ietf.org/mailman/listinfo/lp-wan" rel=3D"noreferrer"=
 target=3D"_blank">https://www.ietf.org/mailman/listinfo/lp-wan</a><br>
</blockquote></div></div>

--000000000000ad8e45058b0cf255--


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From: Thomas Fossati <tho.ietf@gmail.com>
Date: Tue, 11 Jun 2019 23:11:58 +0100
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Subject: Re: [lp-wan] [core] Fwd: New Version Notification for draft-ietf-lpwan-coap-static-context-hc-08.txt
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Hi Laurent, Ana,

On Tue, Jun 11, 2019 at 3:16 PM Laurent Toutain
<laurent.toutain@imt-atlantique.fr> wrote:
> On Thu, May 30, 2019 at 1:53 PM Thomas Fossati <tho.ietf@gmail.com> wrote=
:
> > - Sec 4.1: "This field is bidirectional and MUST be elided during
> > the SCHC compression". This is a dangerous statement as it leads us
> > straight into CoAP ossification territory.  If you want SCHC to work
> > with CoAP v1 only what you really want to say here is "SHCH
> > compression MUST NOT be applied to CoAP packets with version
> > different from v1".  Granted that, a SCHC box deployed today could
> > sit in the field happily ever after.  If not, when a new CoAP
> > version is rolled out, endpoints wouldn=E2=80=99t be able to use this n=
ew
> > version on any path crossing an SCHC box.
>
> We don't think this will create ossification. The rule is very
> flexible and do not force to elide this field at any time. For
> instance, if you have a device that is CoAP v1 only, then you can
> elide the field.
>
> During a transition period if the device accepts CoAP v1 and v2, then
> the rule can be set to MO=3Dignore and CDA=3Dvalue-sent. Or a rule for v1
> and a rule for v2 can be used.  In anycase the device will receive the
> appropriate CoAP version after decompression.

Thanks for taking the time to explain.

However, I'm still a bit unsure about what is story for supporting
protocol upgrade / evolution, so please let me rephrase my concern and
you can clear all my doubts :-)

Does the spec in its current form provide the guarantee that a middlebox
that is deployed today and never updated (or updated on a different time
scale with respect to the endpoints) will not interfere with versions of
the protocol it doesn't understand?  Otherwise said: what is the default
behaviour of a SCHC entity when handling unknown semantics?

cheers, thanks, t


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From: Olivier Gimenez <ogimenez@semtech.com>
To: Laurent Toutain <laurent.toutain@imt-atlantique.fr>
CC: lp-wan <lp-wan@ietf.org>, "draft-ietf-lpwan-schc-over-lorawan@ietf.org" <draft-ietf-lpwan-schc-over-lorawan@ietf.org>, BARTHEL Dominique IMT/OLPS <dominique.barthel@orange.com>, ivaylo petrov <ivaylo@ackl.io>, "Nicolas Sornin" <nsornin@semtech.com>
Thread-Topic: [lp-wan] SCHC over LoRaWAN review
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Date: Fri, 14 Jun 2019 13:28:28 +0000
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Subject: Re: [lp-wan] SCHC over LoRaWAN review
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Date: Thu, 20 Jun 2019 16:24:02 +0200
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To: Olivier Gimenez <ogimenez@semtech.com>
Cc: lp-wan <lp-wan@ietf.org>, "draft-ietf-lpwan-schc-over-lorawan@ietf.org" <draft-ietf-lpwan-schc-over-lorawan@ietf.org>,  "BARTHEL Dominique IMT/OLPS" <dominique.barthel@orange.com>, ivaylo petrov <ivaylo@ackl.io>, Nicolas Sornin <nsornin@semtech.com>
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Subject: Re: [lp-wan] SCHC over LoRaWAN review
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Hi Olivier,

Thank you for your answers, and the explanation for a Tile of 3 Bytes,
that's a good way to fill the frame.
I still have questions on fPorts:

- rule 20 is fully specified by the draft and that's logicial, and is
designed for short uplinks, that's perfect.

for the other rules
- rule 21 is for any SCHC rule uplink
- rule 22 is for any SCHC rule downlink,

For these rules are less directive, I suppose an implementer may decide to
use then as he wants, even if he does not follow the draft representation.

In SCHC a compression rule is bidirectional you can with the same rule ID
use it differently up and downlink. How do you plan to map it in the
LoRaWAN case?
same rule ID but the fport is changing regarding it has been sent by the
device or the network?

In SCHC the fragmentation rules are in one direction, the other direction
is used for ack with the same ruleID.
how do you map it ? do you use the same fPort for the ack ? For instance if
I send the combination fPort:RuleID
21:1000 for a fragment, the ack will be 21:1000 or 22:1000 (personally I
prefer to use 21: for the Ack).

See you

Laurent

On Fri, Jun 14, 2019 at 3:28 PM Olivier Gimenez <ogimenez@semtech.com>
wrote:

> Thank you Laurent for your review.
>
>
>
>
>
> - On your point about *relation between FPort and RuleID*, I think that
> Dominique's proposition could indeed make this part clearer.
>
>
>
> Something like
>
> FPort:RuleID ?
>
> 20: for the small one
>
> 21:RuleID for uplink
>
> and
>
> 22:RuleID for downlink
>
>
>
> No. *22:RuleID for all downlink* is OK but not 20 and 21.
>
> *21:RuleID works for all uplinks*, fragmented or not, add 2 bytes of
> overhead.
>
> *22: RuledID for fragmented uplinks* where payload is less than 381
> bytes, add 1 byte of overhead. I should add a comment that this one is not
> mandatory on device side, as using FPort 21 for a fragmented payload of 200
> bytes will also work. It is only purpose is reduce the overhead for small
> fragmented payloads.
>
>
>
>
>
>
>
>
>
> - On your point about *relation between compression and fragmentation, *we
> can add a bit more text about it, but our general idea was that compression
> depends much more on the specific scenario, so we are only providing the
> required parameters for it and we leave it to the <<*user>> * to figure
> out the remaining details. This is why this part is much shorter and
> probably less detailed. The fragmentation is the part that seemed the most
> likely source of interoperability issues and that is why most of our
> efforts so far have been concentrated on it.
>
>
>
> ok
>
>
>
> - While tile size of 6 could be used, the idea to have it only 3 bytes
> long is that mac commands in FOpts can be placed, without affecting too
> much the fragmentation. In addition, different payload sizes seem to fit
> well with this tile size. My guess is that only through observing real
> traffic we will be able to select the best tile size for most cases. If you
> have reasons to believe that other tile size will be more appropriate,
> please let us know.
>
>
>
> No I was surprised by the value, but it is a good trade-off
>
>
>
> It is the best one to have an efficient packing of tiles in all LoRaWAN
> MTU, taking into account that there can be FOpts. Using 2 would be even
> better but we would not comply with IPv6 MTU of 1280 bytes.
>
>
>
>
>
> Regarding comments about compression not described: what should be
> described ? The rules are user specific, and user can use 62 rules. What
> else should we write in the document ?
>
>
>
>
>
> I will think about not specifying ruleId in the document, and if it is not
> too difficult to implement.
>
>
>
>
>
> Please find attached the Word document with answers to your comments.
>
>
>
>
>
> Olivier
>
> To view our privacy policy, including the types of personal information we
> collect, process and share, and the rights and options you have in this
> respect, see www.semtech.com/legal.
>

--0000000000002fcba7058bc21bb0
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Hi Olivier,</div><div><br></div><div>Thank you for yo=
ur answers, and the explanation for a Tile of 3 Bytes, that&#39;s a good wa=
y to fill the frame.</div><div>I still have questions on fPorts:</div><div>=
<br></div><div>- rule 20 is fully specified by the draft and that&#39;s log=
icial, and is designed for short uplinks, that&#39;s perfect.</div><div><br=
></div><div>for the other rules<br></div><div>- rule 21 is for any SCHC rul=
e uplink<br></div><div>- rule 22 is for any SCHC rule downlink,</div><div><=
br></div><div>For these rules are less directive, I suppose an implementer =
may decide to use then as he wants, even if he does not follow the draft re=
presentation.</div><div><br></div><div>In SCHC a compression rule is bidire=
ctional you can with the same rule ID use it differently up and downlink. H=
ow do you plan to map it in the LoRaWAN case?</div><div>same rule ID but th=
e fport is changing regarding it has been sent by the device or the network=
?=C2=A0 <br></div><div><br></div><div>In SCHC the fragmentation rules are i=
n one direction, the other direction is used for ack with the same ruleID.<=
/div><div>how do you map it ? do you use the same fPort for the ack ? For i=
nstance if I send the combination fPort:RuleID</div><div>21:1000 for a frag=
ment, the ack will be 21:1000 or 22:1000 (personally I prefer to use 21: fo=
r the Ack).</div><div><br></div><div>See you</div><div><br></div><div>Laure=
nt<br></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"=
gmail_attr">On Fri, Jun 14, 2019 at 3:28 PM Olivier Gimenez &lt;<a href=3D"=
mailto:ogimenez@semtech.com">ogimenez@semtech.com</a>&gt; wrote:<br></div><=
blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l=
eft:1px solid rgb(204,204,204);padding-left:1ex">





<div lang=3D"EN-GB">
<div class=3D"gmail-m_4817928010284252080WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif;color:rgb(31,73,125)">Thank you Laurent for your revie=
w.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p>
<div style=3D"border-color:currentcolor currentcolor currentcolor blue;bord=
er-style:none none none solid;border-width:medium medium medium 1.5pt;paddi=
ng:0cm 0cm 0cm 4pt">
<div>
<div>
<div>
<blockquote style=3D"border-color:currentcolor currentcolor currentcolor rg=
b(204,204,204);border-style:none none none solid;border-width:medium medium=
 medium 1pt;padding:0cm 0cm 0cm 6pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Verdana&quot;,sans-=
serif;color:rgb(11,83,148)"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Verdana&quot;,sans-=
serif;color:rgb(11,83,148)">- On your point about=C2=A0<i>relation between =
FPort and RuleID</i>, I think that Dominique&#39;s proposition could indeed=
 make this part clearer.<u></u><u></u></span></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Something like<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">FPort:RuleID ?<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">20: for the small one<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">21:RuleID for uplink <u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">and<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">22:RuleID for downlink <u></u><u></u></p>
</div>
</div>
</div>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif">No.
</span><i>22:RuleID for all downlink</i> is OK but not 20 and 21.<u></u><u>=
</u></p>
<p class=3D"MsoNormal"><i>21:RuleID works for all uplinks</i>, fragmented o=
r not, add 2 bytes of overhead.<u></u><u></u></p>
<p class=3D"MsoNormal"><i>22: RuledID for fragmented uplinks</i> where payl=
oad is less than 381 bytes, add 1 byte of overhead. I should add a comment =
that this one is not mandatory on device side, as using FPort 21 for a frag=
mented payload of 200 bytes will also
 work. It is only purpose is reduce the overhead for small fragmented paylo=
ads.<u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<blockquote style=3D"border-color:currentcolor currentcolor currentcolor rg=
b(204,204,204);border-style:none none none solid;border-width:medium medium=
 medium 1pt;padding:0cm 0cm 0cm 6pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Verdana&quot;,sans-=
serif;color:rgb(11,83,148)"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Verdana&quot;,sans-=
serif;color:rgb(11,83,148)">- On your point about=C2=A0<i>relation between =
compression and fragmentation,
</i>we can add a bit more text about it, but our general idea was that comp=
ression depends much more on the specific scenario, so we are only providin=
g the required parameters for it and we leave it to the &lt;&lt;<i>user&gt;=
&gt;=C2=A0</i>=C2=A0to figure out the remaining details.
 This is why this part is much shorter and probably less detailed. The frag=
mentation is the part that seemed the most likely source of interoperabilit=
y issues and that is why most of our efforts so far have been concentrated =
on it.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Verdana&quot;,sans-=
serif;color:rgb(11,83,148)"><u></u>=C2=A0<u></u></span></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">ok<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<blockquote style=3D"border-color:currentcolor currentcolor currentcolor rg=
b(204,204,204);border-style:none none none solid;border-width:medium medium=
 medium 1pt;padding:0cm 0cm 0cm 6pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Verdana&quot;,sans-=
serif;color:rgb(11,83,148)">- While tile size of 6 could be used, the idea =
to have it only 3 bytes long is that mac commands in FOpts can be placed, w=
ithout affecting too much the fragmentation. In addition,
 different payload sizes seem to fit well with this tile size. My guess is =
that only through observing real traffic we will be able to select the best=
 tile size for most cases. If you have reasons to believe that other tile s=
ize will be more appropriate, please
 let us know.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Verdana&quot;,sans-=
serif;color:rgb(11,83,148)"><u></u>=C2=A0<u></u></span></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">No I was surprised by the value, but it is a good tr=
ade-off<u></u><u></u></p>
</div>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif">It is the best one to have an efficient packing of ti=
les in all LoRaWAN MTU, taking into account that there can be FOpts. Using =
2 would be even better but we would not comply
 with IPv6 MTU of 1280 bytes. <u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif">Regarding comments about compression not described: w=
hat should be described ? The rules are user specific, and user can use 62 =
rules. What else should we write in the document
 ?<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif">I will think about not specifying ruleId in the docum=
ent, and if it is not too difficult to implement.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif">Please find attached the Word document with answers t=
o your comments.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif">Olivier<u></u><u></u></span></p>
</div>
<br clear=3D"all">
To view our privacy policy, including the types of personal information we =
collect, process and share, and the rights and options you have in this res=
pect, see <a href=3D"http://www.semtech.com/legal" target=3D"_blank">www.se=
mtech.com/legal</a>.<br>
</div>


</blockquote></div>

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: "lpwan-chairs@ietf.org" <lpwan-chairs@ietf.org>, "draft-ietf-lpwan-coap-static-context-hc@ietf.org" <draft-ietf-lpwan-coap-static-context-hc@ietf.org>
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Thread-Topic: [lp-wan] Fwd: WGLC on SCHC for CoAP
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Subject: [lp-wan] FW:  Fwd: WGLC on SCHC for CoAP
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From: Olivier Gimenez <ogimenez@semtech.com>
To: Laurent Toutain <laurent.toutain@imt-atlantique.fr>
CC: lp-wan <lp-wan@ietf.org>, "draft-ietf-lpwan-schc-over-lorawan@ietf.org" <draft-ietf-lpwan-schc-over-lorawan@ietf.org>, BARTHEL Dominique IMT/OLPS <dominique.barthel@orange.com>, ivaylo petrov <ivaylo@ackl.io>, "Nicolas Sornin" <nsornin@semtech.com>
Thread-Topic: [lp-wan] SCHC over LoRaWAN review
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Subject: Re: [lp-wan] SCHC over LoRaWAN review
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From nobody Fri Jun 21 15:59:43 2019
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Date: Sat, 22 Jun 2019 00:47:36 +0200
To: lo <6lo@ietf.org>, tisch <6tisch@ietf.org>, lp-wan <lp-wan@ietf.org>, lwip@ietf.org, Routing Over Low power and Lossy networks <roll@ietf.org>
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Subject: [lp-wan] Constrained Node/Network Cluster @ IETF105: DRAFT AGENDA
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Here is my usual eclectic condensed agenda based on the DRAFT AGENDA
for IETF105.  Remember that there is still quite some potential for
changes.

Conflicts that meet the eye:  COSE/TEEP again!
ROLL/SUIT/DINRG and 6TISCH/ACE are maybe slightly less annoying.
(The poor TEEP people get to both start and end the week, too.)
LAKE and LOOPS -- two BOFs at the same time?

All times are EDT (Eastern Daylight Time) =3D=3D UTC -4 hours.
(Pure UTC times at https://datatracker.ietf.org/meeting/agenda-utc are
useful for those who want to listen from remote.)

Gr=C3=BC=C3=9Fe, Carsten

FRIDAY, March 22, 2019
-- OMA/T2TRG Work Meeting - @ Ericsson Montreal Office (St-Laurent)

SATURDAY/SUNDAY, March 23/24. 2019
-- Hackathon (including various interops) - Centre Ville
-- Sun 1700-1900  Welcome Reception - Place du Canada
-- Sun 1800-2000  Hot RFC Lightning Talks - Viger

MONDAY, July 22, 2019

1000-1200  Morning Session I
Laurier 	ART	dispatch	Dispatch WG
Van Horne	SEC ***	teep	Trusted Execution Environment =
Provisioning WG

1330-1530  Afternoon Session I
Van Horne	INT ***	6lo	IPv6 over Networks of =
Resource-constrained Nodes WG
Place du Canada	SEC	secdispatch	Security Dispatch WG
Duluth  	TSV	taps	Transport Services WG

1550-1750  Afternoon Session II
Laurier 	ART	httpbis	Hypertext Transfer Protocol WG
St-Catherine	OPS	v6ops	IPv6 Operations WG
Van Horne	SEC ***	lake	Lightweight Authenticated Key Exchange =
BOF
Place du Canada	TSV	loops	Local Optimizations on Path Segments BOF

1810-1910  Afternoon Session III
Laurier 	TSV	tsvwg	Transport Area Working Group WG

TUESDAY, July 23, 2019

1000-1200  Morning Session I
St-Catherine	ART ***	cbor	1000-1130 Concise Binary Object =
Representation Maintenance and Extensions WG
St-Catherine	INT	ipwave	1130-1200 IP Wireless Access in =
Vehicular Environments WG
Notre Dame	IRTF	icnrg	Information-Centric Networking
Duluth  	OPS	anima	Autonomic Networking Integrated Model =
and Approach WG
Van Horne	SEC	cacao	Collaborative Automated Course of Action =
Operations for Cyber Security BOF
Place du Canada	TSV	quic	QUIC WG

1330-1500  Afternoon Session I
Duluth  	OPS	anima	Autonomic Networking Integrated Model =
and Approach WG

1520-1650  Afternoon Session II
Duluth  	INT	intarea	Internet Area Working Group WG
Place du Canada	IRTF	irtfopen	IRTF Open Meeting
Van Horne	SEC	oauth	Web Authorization Protocol WG

1710-1810  Afternoon Session III
Duluth  	ART ***	core	Constrained RESTful Environments WG
Laurier 	INT	6man	IPv6 Maintenance WG
Place du Canada	SEC	tls	Transport Layer Security WG

WEDNESDAY, July 24, 2019

1000-1200  Morning Session I
Van Horne	IRTF***	dinrg	Decentralized Internet Infrastructure
St-Catherine	RTG ***	roll	Routing Over Low power and Lossy =
networks WG
Viger   	SEC ***	suit	Software Updates for Internet of Things =
WG
Place du Canada	TSV	quic	QUIC WG

1330-1530  Afternoon Session I
Place du Canada	GEN	netrqmts	IETF Meeting Network =
Requirements BOF
Laurier 	IRTF	pearg	Privacy Enhancements and Assessments =
Research Group
Viger   	IRTF***	t2trg	Thing-to-Thing
St-Catherine	RTG	bier	Bit Indexed Explicit Replication WG
Centre Ville	RTG	detnet	Deterministic Networking WG

1550-1650  Afternoon Session II
St-Catherine	RTG	babel	Babel routing protocol WG
Centre Ville	RTG	detnet	Deterministic Networking WG
Van Horne	SEC ***	rats	Remote ATtestation ProcedureS WG

THURSDAY, July 25, 2019

1000-1200  Morning Session I
Centre Ville	ART ***	core	Constrained RESTful Environments WG
St-Catherine	RTG	rift	Routing In Fat Trees WG
Place du Canada	SEC	tls	Transport Layer Security WG
Laurier 	TSV	tsvwg	Transport Area Working Group WG

1330-1530  Afternoon Session I
Duluth  	INT	dnssd	Extensions for Scalable DNS Service =
Discovery WG
Viger   	IRTF	coinrg	Computing in the Network Proposed =
Research Group
Laurier 	IRTF	panrg	Path Aware Networking RG
Place du Canada	SEC	saag	Security Area Open Meeting

1550-1720  Afternoon Session II
Laurier 	ART	httpbis	Hypertext Transfer Protocol WG
Duluth  	INT	6man	IPv6 Maintenance WG
Place du Canada	IRTF	cfrg	Crypto Forum
St-Catherine	SEC ***	rats	Remote ATtestation ProcedureS WG
Centre Ville	TSV	tsvarea	Transport Area Open Meeting

1740-1910  Afternoon Session III
Duluth  	INT ***	6tisch	IPv6 over the TSCH mode of IEEE =
802.15.4e WG
Centre Ville	SEC ***	ace	Authentication and Authorization for =
Constrained Environments WG
Place du Canada	SEC	mls	Messaging Layer Security WG
Notre Dame	TSV	rmcat	RTP Media Congestion Avoidance =
Techniques WG

FRIDAY, July 26, 2019

1000-1200  Morning Session I
Notre Dame	ART	ice	Interactive Connectivity Establishment =
WG
Centre Ville	INT ***	lpwan	IPv6 over Low Power Wide-Area Networks =
WG
Place du Canada	IRTF	maprg	Measurement and Analysis for Protocols
Laurier 	SEC	mls	Messaging Layer Security WG
Duluth  	SEC	oauth	Web Authorization Protocol WG

1220-1350  Afternoon Session I
Centre Ville	SEC	acme	Automated Certificate Management =
Environment WG
Van Horne	SEC ***	cose	CBOR Object Signing and Encryption WG
St-Catherine	SEC ***	teep	Trusted Execution Environment =
Provisioning WG





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Dear LPWANers,



The final agenda for IETF 105 has been published at: https://datatracker.ie=
tf.org/meeting/105/agenda.html. Keep this link, it's always useful with a n=
umber of pointers to meeting needful things. Also consider the IETF applica=
tion for your smartphone...



So LPWAN will be meeting on Friday July 26th from 10:00 to 12:00, during Mo=
rning session I in room Centre Ville<https://datatracker.ietf.org/meeting/1=
05/floor-plan?room=3Dcentre-ville>.



If you'd like a slot to present a draft, please send a request to the chair=
s (cc) by Friday July 12th.



Please provide the following information:

  *   Draft name
  *   Presenter name
  *   Remote vs. Local presentation
  *   Expected duration
  *   Objective of the discussion



We kindly request to send your slides for presentations by Tuesday July 23r=
d. A template will be provided.



Any WG draft not being discussed/presented needs a status update sent to th=
e list by Tuesday July 23rd as well.



As always - we would appreciate your help in taking notes and jabber, pleas=
e do volunteer!



Looking forward to seeing you in all Montreal,



Alexander and Pascal




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<p class=3D"MsoPlainText"><span style=3D"color:black">Dear LPWANers,<o:p></=
o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">&nbsp;<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">The final agenda for =
IETF 105 has been published at:
</span><a href=3D"https://datatracker.ietf.org/meeting/105/agenda.html">htt=
ps://datatracker.ietf.org/meeting/105/agenda.html</a><span style=3D"color:b=
lack">. Keep this link, it's always useful with a number of pointers to mee=
ting needful things. Also consider the
 IETF application for your smartphone...<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">&nbsp;<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">So LPWAN will be meet=
ing on </span>
Friday<span style=3D"color:black"> July 26<sup>th</sup> from 10:00 to 12:00=
, during
</span>Morning session I <span style=3D"color:black">in room </span><a href=
=3D"https://datatracker.ietf.org/meeting/105/floor-plan?room=3Dcentre-ville=
">Centre Ville</a>.<span style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">&nbsp;<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">If you'd like a slot =
to present a draft, please send a request to the chairs (cc) by
<u>Friday July 12<sup>th</sup></u>. <u><o:p></o:p></u></span></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">&nbsp;<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">Please provide the fo=
llowing information:<o:p></o:p></span></p>
<ul style=3D"margin-top:0cm" type=3D"disc">
<li class=3D"MsoPlainText" style=3D"color:black;mso-list:l0 level1 lfo1">Dr=
aft name<o:p></o:p></li><li class=3D"MsoPlainText" style=3D"color:black;mso=
-list:l0 level1 lfo1">Presenter name
<o:p></o:p></li><li class=3D"MsoPlainText" style=3D"color:black;mso-list:l0=
 level1 lfo1">Remote vs. Local presentation<o:p></o:p></li><li class=3D"Mso=
PlainText" style=3D"color:black;mso-list:l0 level1 lfo1">Expected duration<=
o:p></o:p></li><li class=3D"MsoPlainText" style=3D"color:black;mso-list:l0 =
level1 lfo1">Objective of the discussion<o:p></o:p></li></ul>
<p class=3D"MsoPlainText"><span style=3D"color:black">&nbsp;<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">We kindly request to =
send your slides for presentations by Tuesday July 23<sup>rd</sup>. A templ=
ate will be provided.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">&nbsp;<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">Any WG draft not bein=
g discussed/presented needs a status update sent to the list by Tuesday Jul=
y 23<sup>rd</sup> as well.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">&nbsp;<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">As always - we would =
appreciate your help in taking notes and jabber, please do volunteer!<o:p><=
/o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">&nbsp;<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">Looking forward to se=
eing you in all Montreal,<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">&nbsp;<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText"><span lang=3D"FR" style=3D"color:black">Alexander=
 and Pascal</span><span style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black">&nbsp;<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</body>
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From: <dominique.barthel@orange.com>
To: Laurent Toutain <laurent.toutain@imt-atlantique.fr>
CC: "draft-ietf-lpwan-coap-static-context-hc@ietf.org" <draft-ietf-lpwan-coap-static-context-hc@ietf.org>, "lp-wan@ietf.org" <lp-wan@ietf.org>
Thread-Topic: [lp-wan] I-D Action: draft-ietf-lpwan-coap-static-context-hc-08.txt
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Date: Mon, 24 Jun 2019 15:34:29 +0000
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From: <dominique.barthel@orange.com>
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From: Thomas Fossati <tho.ietf@gmail.com>
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Subject: Re: [lp-wan] [core] Fwd: New Version Notification for draft-ietf-lpwan-coap-static-context-hc-08.txt
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Hey Dominique,

On Mon, Jun 24, 2019 at 4:47 PM <dominique.barthel@orange.com> wrote:
> Speaking under the control of Laurent, here's my answer.

:-)

> By default, SCHC transmits in uncompressed form those messages it doesn't
> file compression rules for.
> The set of compression rules proposed by Laurent matches the current
> version of CoAP.
> Therefore, a message bearing a different (i.e. future) version of CoAP
> will not be matched by the current set of rules, therefore it will be sen=
t
> uncompressed.
> Does that clear out your doubts?

So, IIUC, given the current vocabulary a network operator deploying /
configuring the box has absolutely zero chance (even by accident) of
becoming an ossifier?

If so, excellent, I=E2=80=99m very happy!

If instead there is a residual chance of composing a ruleset such that
that wouldn't be the case, the document should contain advice on how
to avoid the situation to arise.

In fact, to avoid all doubts & to ease future stages of review on this
point, I'd suggest you add an explicit "ossification / operations
considerations" section where you capture this conversation and
explain exactly what are SCHC key design features that avoid creating
surface for blocking protocol evolution.

(Sorry to insist so much on this aspect, but I think making it an
explicit discussion point in the document is really important.)


From nobody Wed Jun 26 07:57:58 2019
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From: Alexander Pelov <a@ackl.io>
Date: Wed, 26 Jun 2019 16:57:21 +0200
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Subject: [lp-wan] Minutes from today's Interim meeting
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Dear all,

As always, you can find today's minutes on the Datatracker.

https://datatracker.ietf.org/meeting/interim-2019-lpwan-10/materials/minutes-interim-2019-lpwan-10-201906261600

Cheers,
Pascal and Alexander

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<div dir=3D"ltr">Dear all,<div><br></div><div>As always, you can find today=
&#39;s minutes on the Datatracker.</div><div><br></div><div><a href=3D"http=
s://datatracker.ietf.org/meeting/interim-2019-lpwan-10/materials/minutes-in=
terim-2019-lpwan-10-201906261600">https://datatracker.ietf.org/meeting/inte=
rim-2019-lpwan-10/materials/minutes-interim-2019-lpwan-10-201906261600</a><=
br></div><div><br></div><div>Cheers,</div><div>Pascal and Alexander</div><d=
iv><br></div></div>

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From nobody Wed Jun 26 07:58:57 2019
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Subject: [lp-wan] I-D Action: draft-ietf-lpwan-schc-over-lorawan-01.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the IPv6 over Low Power Wide-Area Networks WG of the IETF.

        Title           : Static Context Header Compression (SCHC) over LoRaWAN
        Authors         : Olivier Gimenez
                          Ivaylo Petrov
	Filename        : draft-ietf-lpwan-schc-over-lorawan-01.txt
	Pages           : 21
	Date            : 2019-06-26

Abstract:
   The Static Context Header Compression (SCHC) specification describes
   generic header compression and fragmentation techniques for LPWAN
   (Low Power Wide Area Networks) technologies.  SCHC is a generic
   mechanism designed for great flexibility, so that it can be adapted
   for any of the LPWAN technologies.

   This document provides the adaptation of SCHC for use in LoRaWAN
   networks, and provides elements such as efficient parameterization
   and modes of operation.  This is called a profile.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-lpwan-schc-over-lorawan/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-lpwan-schc-over-lorawan-01
https://datatracker.ietf.org/doc/html/draft-ietf-lpwan-schc-over-lorawan-01

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-lpwan-schc-over-lorawan-01


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


From nobody Fri Jun 28 15:59:19 2019
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From: "\"IETF Secretariat\"" <agenda@ietf.org>
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Subject: [lp-wan] lpwan - Requested session has been scheduled for IETF 105
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Dear Pascal Thubert,

The session(s) that you have requested have been scheduled.
Below is the scheduled session information followed by
the original request. 


    lpwan Session 1 (1:30 requested)
    Friday, 26 July 2019, Morning Session I 1000-1200
    Room Name: Centre Ville size: 200
    ---------------------------------------------


iCalendar: https://datatracker.ietf.org/meeting/105/sessions/lpwan.ics

Request Information:


---------------------------------------------------------
Working Group Name: IPv6 over Low Power Wide-Area Networks
Area Name: Internet Area
Session Requester: Pascal Thubert

Number of Sessions: 1
Length of Session(s):  1.5 Hours
Number of Attendees: 60
Conflicts to Avoid: 
 First Priority: 6lo roll rift 6tisch core intarea paw
 Second Priority: detnet netconf lwig suit cbor
 Third Priority: 6man bier ace


People who must be present:
  Suresh Krishnan
  Pascal Thubert
  Alexander Pelov

Resources Requested:

Special Requests:
  please also avoid collision with lake (Lightweight AKE)
---------------------------------------------------------

