Proposed response to LS from 3GPP RAN2

Magnus Westerlund <[email protected]> Wed, 27 Mar 2019 07:31:07 +0000
Newsgroups gmane.ietf.rohc
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Hi,

The IESG is targeting to approve the response on Friday sometime after 13:0=
0 CET. Appreciate any comment you may have.

Cheers

Magnus

Title: In Response to 3GPP RAN2=92s LS on RoHC utilization for Ethernet hea=
der compression
To: 3GPP RAN2
Cc: IEEE 802
From: IETF
>From Contact: Magnus Westerlund
Purpose: In Response
Reference: R2-1902372

 Body:
Greetings,

The IETF appreciate 3GPP RAN2 reaching out to IETF on the topic of robust h=
eader compression (ROHC). We are happy to answer your questions. See below =
for our response to your questions. But let us first provide some backgroun=
d information.
It has been 9 years since the ROHC WG was closed, IETF currently has no est=
ablished community working on ROHC. However, for minor work adding a work i=
tem to the TSVWG would be a possibility. The IETF could also consider formi=
ng a new WG if there would be good reasons for more substantial work on hea=
der compression. However, for a single ROHC profile there are no necessity =
for such work in IETF. In case 3GPP would see a need for combining compress=
ion of ethernet with several sets of high layer protocols, for example Ethe=
rnet/IPv6/UDP and Ethernet/IPv6/TCP etc. there might be wider interest whic=
h may motivate doing such work in IETF.
The ROHC framework is defined to allow for additional profiles and allows r=
egistration of ROHC profiles from both IETF and external bodies, such as 3G=
PP. The IANA registry for ROHC Profile Identifiers (https://www.iana.org/as=
signments/rohc-pro-ids/rohc-pro-ids.xhtml#rohc-pro-ids-1) is operating unde=
r the Specification Required policy defined in RFC 8126.


Q1: Does IETF or IEEE have any concerns with 3GPP defining new RoHC profile=
 for Ethernet header compression?

Answer: IETF has no issues with 3GPP defining a ROHC profile as long it is =
registered with IANA.

Q3: In case 3GPP is allowed to develop RoHC profile for Ethernet header com=
pression, does it have to be registered with IANA. If yes, how long can suc=
h process take?

Answer: For 3GPP to be assigned a ROHC profile identifier the new profile n=
eeds to be registered with IANA. This registry operates under a Specificati=
on Required policy. A 3GPP technical specification meet the formal requirem=
ents of this policy and enable registration.

There is also an IANA expert review, this review is to verify that the regi=
stration is for a ROHC profile with an interoperable description. The IANA =
registration process should be accomplished from submitted request to compl=
etion in a couple of weeks (2-4) given no issues are identified. When the e=
xpert has approved the registration the IANA will assign the profile an ide=
ntifier.

Q4: According to IETF, what are the actions needed of 3GPP to specify and m=
aintain a ROHC profile?
3GPP defines and documents the ROHC profile in a technical specification. W=
hen the content of the specification is mature and describes a solution tha=
t fits the ROHC framework RFC 5795 and enables interoperable implementation=
, then 3GPP can submit a registration request to IANA (https://www.iana.org=
/protocols/apply) for a ROHC Profile Identifier. If there are any issues th=
e expert will communicate such issues to the 3GPP contact person requesting=
 the registration, so they can communicate these to the 3GPP RAN2 WG so tha=
t they can be resolved. When registration has been approved, IANA will assi=
gn a profile identifier that can be added to the 3GPP specification. Contin=
ued maintenance of the ROHC profile is solely under 3GPP responsibility.
Please note that the registration request can be sent prior to the 3GPP spe=
cification is 100% complete, but the ROHC profile description needs to be m=
ature enough for the expert to determine that the profile will result in in=
teroperable implementations.

--

Magnus Westerlund

----------------------------------------------------------------------
Network Architecture & Protocols, Ericsson Research
----------------------------------------------------------------------
Ericsson AB                 | Phone  +46 10 7148287
Torshamnsgatan 23           | Mobile +46 73 0949079
SE-164 80 Stockholm, Sweden | mailto: [email protected]<mailto=
:[email protected]>
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<p>Hi, <br>
</p>
<p>The IESG is targeting to approve the response on Friday sometime after 1=
3:00 CET. Appreciate any comment you may have.
<br>
</p>
<p>Cheers</p>
<p>Magnus<br>
</p>
<p><br>
</p>
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<![endif]--></p>
<p class=3D"MsoNormal" style=3D"margin-top:0cm;margin-right:0cm;margin-bott=
om:6.0pt;=0A=
        margin-left:4.0cm;text-indent:-4.0cm;tab-stops:155.95pt">
<span style=3D"font-family:&quot;Arial&quot;,sans-serif;mso-bidi-font-weigh=
t:bold" lang=3D"EN-GB">Title: In Response to 3GPP RAN2=92s
</span><span style=3D"font-family:&quot;Arial&quot;,sans-serif" lang=3D"EN-=
GB">L<span style=3D"mso-bidi-font-weight:bold">S on RoHC utilization for Et=
hernet header compression</span></span></p>
<p class=3D"MsoNormal" style=3D"margin-top:0cm;margin-right:0cm;margin-bott=
om:6.0pt;=0A=
        margin-left:4.0cm;text-indent:-4.0cm;tab-stops:155.95pt">
<span style=3D"font-family:&quot;Arial&quot;,sans-serif;mso-bidi-font-weigh=
t:bold" lang=3D"EN-GB">To: 3GPP RAN2</span></p>
<p class=3D"MsoNormal" style=3D"margin-top:0cm;margin-right:0cm;margin-bott=
om:6.0pt;=0A=
        margin-left:4.0cm;text-indent:-4.0cm;tab-stops:155.95pt">
<span style=3D"font-family:&quot;Arial&quot;,sans-serif;mso-bidi-font-weigh=
t:bold" lang=3D"EN-GB">Cc: IEEE 802</span></p>
<p class=3D"MsoNormal" style=3D"margin-top:0cm;margin-right:0cm;margin-bott=
om:6.0pt;=0A=
        margin-left:4.0cm;text-indent:-4.0cm;tab-stops:155.95pt">
<span style=3D"font-family:&quot;Arial&quot;,sans-serif;mso-bidi-font-weigh=
t:bold" lang=3D"EN-GB">From: IETF</span></p>
<p class=3D"MsoNormal" style=3D"margin-top:0cm;margin-right:0cm;margin-bott=
om:6.0pt;=0A=
        margin-left:4.0cm;text-indent:-4.0cm;tab-stops:155.95pt">
<span style=3D"font-family:&quot;Arial&quot;,sans-serif;mso-bidi-font-weigh=
t:bold" lang=3D"EN-GB">From Contact: Magnus Westerlund</span></p>
<p class=3D"MsoNormal" style=3D"margin-top:0cm;margin-right:0cm;margin-bott=
om:6.0pt;=0A=
        margin-left:4.0cm;text-indent:-4.0cm;tab-stops:155.95pt">
<span style=3D"font-family:&quot;Arial&quot;,sans-serif;mso-bidi-font-weigh=
t:bold" lang=3D"EN-GB">Purpose: In Response</span></p>
<p class=3D"MsoNormal" style=3D"margin-top:0cm;margin-right:0cm;margin-bott=
om:6.0pt;=0A=
        margin-left:4.0cm;text-indent:-4.0cm;tab-stops:155.95pt">
<span style=3D"font-family:&quot;Arial&quot;,sans-serif;mso-bidi-font-weigh=
t:bold" lang=3D"EN-GB">Reference:
</span><b><span style=3D"font-size:11.0pt;mso-bidi-font-size:10.0pt;font-fa=
mily:&quot;Arial&quot;,sans-serif" lang=3D"EN-GB">R2-1902372</span></b></p>
<p class=3D"MsoNormal" style=3D"margin-top:0cm;margin-right:0cm;margin-bott=
om:6.0pt;=0A=
        margin-left:4.0cm;text-indent:-4.0cm;tab-stops:155.95pt">
<span style=3D"font-family:&quot;Arial&quot;,sans-serif;mso-bidi-font-weigh=
t:bold" lang=3D"EN-GB">&nbsp;</span></p>
<p class=3D"MsoNormal" style=3D"margin-top:0cm;margin-right:0cm;margin-bott=
om:6.0pt;=0A=
        margin-left:4.0cm;text-indent:-4.0cm;tab-stops:155.95pt">
<span style=3D"font-family:&quot;Arial&quot;,sans-serif;mso-bidi-font-weigh=
t:bold" lang=3D"EN-GB"><span style=3D"mso-spacerun:yes">&nbsp;</span>Body:<=
/span></p>
<p class=3D"MsoNormal" style=3D"margin-top:0cm;margin-right:0cm;margin-bott=
om:6.0pt;=0A=
        margin-left:4.0cm;text-indent:-4.0cm;tab-stops:155.95pt">
<span style=3D"font-family:&quot;Arial&quot;,sans-serif;mso-bidi-font-weigh=
t:bold" lang=3D"EN-GB">Greetings,</span></p>
<p class=3D"MsoNormal" style=3D"margin-top:0cm;margin-right:0cm;margin-bott=
om:6.0pt;=0A=
        margin-left:4.0cm;text-indent:-4.0cm;tab-stops:155.95pt">
<span style=3D"font-family:&quot;Arial&quot;,sans-serif;mso-bidi-font-weigh=
t:bold" lang=3D"EN-GB">&nbsp;</span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:6.0pt;tab-stops:155.95pt"><sp=
an style=3D"font-family:&quot;Arial&quot;,sans-serif;mso-bidi-font-weight:b=
old" lang=3D"EN-GB">The IETF appreciate 3GPP RAN2 reaching out to IETF on t=
he topic of robust header compression (ROHC). We are
 happy to answer your questions. See below for our response to your questio=
ns. But let us first provide some background information.
</span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:6.0pt;tab-stops:155.95pt"><sp=
an style=3D"font-family:&quot;Arial&quot;,sans-serif" lang=3D"EN-GB">It has=
 been 9 years since the ROHC WG was closed, IETF currently has no establish=
ed community working on ROHC. However, for minor work
 adding a work item to the TSVWG would be a possibility. The IETF could als=
o consider forming a new WG if there would be good reasons for more substan=
tial work on header compression. However, for a single ROHC profile there a=
re no necessity for such work in
 IETF. In case 3GPP would see a need for combining compression of ethernet =
with several sets of high layer protocols, for example Ethernet/IPv6/UDP an=
d Ethernet/IPv6/TCP etc. there might be wider interest which may motivate d=
oing such work in IETF.
</span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:6.0pt;tab-stops:155.95pt"><sp=
an style=3D"font-family:&quot;Arial&quot;,sans-serif" lang=3D"EN-GB">The RO=
HC framework is defined to allow for additional profiles and allows registr=
ation of ROHC profiles from both IETF and external
 bodies, such as 3GPP. The IANA registry for ROHC Profile Identifiers (<a h=
ref=3D"https://www.iana.org/assignments/rohc-pro-ids/rohc-pro-ids.xhtml#roh=
c-pro-ids-1">https://www.iana.org/assignments/rohc-pro-ids/rohc-pro-ids.xht=
ml#rohc-pro-ids-1</a>) is operating
 under the Specification Required policy defined in RFC 8126. </span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:6.0pt;tab-stops:155.95pt"><sp=
an style=3D"font-family:&quot;Arial&quot;,sans-serif;mso-bidi-font-weight:b=
old" lang=3D"EN-GB">&nbsp;</span></p>
<p class=3D"MsoHeader" style=3D"margin-bottom:12.0pt;tab-stops:65.2pt"><i s=
tyle=3D"mso-bidi-font-style:normal"><span style=3D"font-family:&quot;Arial&=
quot;,sans-serif" lang=3D"EN-GB">Q1: Does IETF or IEEE have any concerns wi=
th 3GPP defining new RoHC profile for Ethernet header
 compression?</span></i></p>
<p class=3D"MsoHeader" style=3D"margin-bottom:12.0pt;tab-stops:65.2pt"><spa=
n style=3D"font-family:&quot;Arial&quot;,sans-serif" lang=3D"EN-GB">Answer:=
 IETF has no issues with 3GPP defining a ROHC profile as long it is registe=
red with IANA.</span></p>
<p class=3D"MsoHeader" style=3D"margin-bottom:12.0pt;tab-stops:65.2pt"><i s=
tyle=3D"mso-bidi-font-style:normal"><span style=3D"font-family:&quot;Arial&=
quot;,sans-serif" lang=3D"EN-GB">Q3: In case 3GPP is allowed to develop RoH=
C profile for Ethernet header compression, does it have
 to be registered with IANA. If yes, how long can such process take?</span>=
</i></p>
<p class=3D"MsoHeader" style=3D"margin-bottom:12.0pt;tab-stops:65.2pt"><spa=
n style=3D"font-family:&quot;Arial&quot;,sans-serif" lang=3D"EN-GB">Answer:=
 For 3GPP to be assigned a ROHC profile identifier the new profile needs to=
 be registered with IANA. This registry operates under
 a Specification Required policy. A 3GPP technical specification meet the f=
ormal requirements of this policy and enable registration.
</span></p>
<p class=3D"MsoHeader" style=3D"margin-bottom:12.0pt;tab-stops:65.2pt"><spa=
n style=3D"font-family:&quot;Arial&quot;,sans-serif" lang=3D"EN-GB">There i=
s also an IANA expert review, this review is to verify that the registratio=
n is for a ROHC profile with an interoperable description.
 The IANA registration process should be accomplished from submitted reques=
t to completion in a couple of weeks (2-4) given no issues are identified. =
When the expert has approved the registration the IANA will assign the prof=
ile an identifier.</span></p>
<p class=3D"MsoHeader" style=3D"margin-bottom:12.0pt;tab-stops:65.2pt"><i s=
tyle=3D"mso-bidi-font-style:normal"><span style=3D"font-family:&quot;Arial&=
quot;,sans-serif" lang=3D"EN-GB">Q4: According to IETF, what are the action=
s needed of 3GPP to specify and maintain a ROHC profile?</span></i></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:6.0pt;tab-stops:155.95pt"><sp=
an style=3D"font-family:&quot;Arial&quot;,sans-serif;mso-bidi-font-weight:b=
old" lang=3D"EN-GB">3GPP defines and documents the ROHC profile in a techni=
cal specification. When the content of the specification
 is mature and describes a solution that fits the ROHC framework RFC 5795 a=
nd enables interoperable implementation, then 3GPP can submit a registratio=
n request to IANA (<a href=3D"https://www.iana.org/protocols/apply">https:/=
/www.iana.org/protocols/apply</a>)
 for a ROHC Profile Identifier. If there are any issues the expert will com=
municate such issues to the 3GPP contact person requesting the registration=
, so they can communicate these to the 3GPP RAN2 WG so that they can be res=
olved. When registration has been
 approved, IANA will assign a profile identifier that can be added to the 3=
GPP specification. Continued maintenance of the ROHC profile is solely unde=
r 3GPP responsibility.
</span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:6.0pt;tab-stops:155.95pt"><sp=
an style=3D"font-family:&quot;Arial&quot;,sans-serif;mso-bidi-font-weight:b=
old" lang=3D"EN-GB">Please note that the registration request can be sent p=
rior to the 3GPP specification is 100% complete, but
 the ROHC profile description needs to be mature enough for the expert to d=
etermine that the profile will result in interoperable implementations.</sp=
an></p>
<p></p>
<pre class=3D"moz-signature" cols=3D"72">-- =0A=
=0A=
Magnus Westerlund =0A=
=0A=
----------------------------------------------------------------------=0A=
Network Architecture &amp; Protocols, Ericsson Research=0A=
----------------------------------------------------------------------=0A=
Ericsson AB                 | Phone  &#43;46 10 7148287=0A=
Torshamnsgatan 23           | Mobile &#43;46 73 0949079=0A=
SE-164 80 Stockholm, Sweden | mailto: <a class=3D"moz-txt-link-abbreviated"=
 href=3D"mailto:[email protected]">magnus.westerlund@ericsson.=
com</a>=0A=
----------------------------------------------------------------------</pre=
>
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