Hello Dan -
Perhaps I misunderstood the intent - because this was posted to DMM, I
assumed Markus referring to the use of GTP-U over the N3 interface
(RAN-UPF). The documents you refer to deal only with N9 (UPF-UPF); in
fact, 29892 explicitly states that N3 is out of scope.
GTP-U is nothing more than a container for transporting application
metadata in-band along with the user PDU (IP packet). Definition and use
of the metadata (represented as a set of TLVs) is outside the scope of
GTP-U. As a consequence, GTP-U is also stateless.
I'm not sure what your goal is. If the intent is to define a transport
protocol with more capabilities that GTP-U, then there are several
possibilities (some of which have been studied in the past). Personally,
I don't think SRv6 is a particularly good candidate for this (e.g. as
noted in 29892, there are a limited number of bits available in a SID).
/bill
On 2025-08-06 10:10 a.m., DanVoyer wrote:
Hi Bill,
One of the values for SRv6, compared to GTP, is it's stateless. But, the
goal for Marcus is open a study at 3GPP to come up with a comparable
analysis for U-GTP and SRv6.
On your point for RAN-related information, I'll invite you to read the
document TR. 29.892 section 6.2
*6.2.2*: Details how SRv6 can be applied within 5GC, including protocol
adaptation to the N3/N9/N6 interfaces and mapping from GTP attributes
(e.g., QFI, TEID) to SIDs.
Thanks,
Dan
On Thu, Jul 31, 2025 at 12:03 PM Bill Gage <[email protected]
<mailto:[email protected]>> wrote:
Hello Markus -
I'm a bit confused by your proposal.
As indicated in the slide set, slides 1-7, SRv6 makes sense as a TE
replacement for MPLS in the user plane. But I don't see how SRv6 (at
least in its current form) provides value as a replacement for GTP-U.
In addition to the PDU (IP packet) being transported, GTP-U includes a
header that contains RAN-related information fields such as end point
identifier (for mapping to a radio bearer), sequence numbers, QoS
information, etc.
What value is SRv6 bringing to this capability?
/bill
On 2025-07-21 12:33 p.m., [email protected]
<mailto:[email protected]> wrote:
> Dear DMM and SRv6ops community,
>
> I would like to draw your attention to an activity that we want
to bring
> to 3GPP to investigate for 6G. It is about the replacement of
GTP-U by
> SRv6 for mobile user plane. This should be of particular interest
to all
> operators/vendors already using/implementing SRv6 or planning its
> introduction.
>
> The last three slides in the slide set at https://
datatracker.ietf.org/ <https://datatracker.ietf.org/>
> meeting/123/materials/slides-123-srv6ops-21-advancing-deutsche-
telekoms-
> traffic-engineering-for-srv6-01 <https://datatracker.ietf.org/
<https://datatracker.ietf.org/>
> meeting/123/materials/slides-123-srv6ops-21-advancing-deutsche-
telekoms-
> traffic-engineering-for-srv6-01> provide more information about our
> motivation and will be presented by me tomorrow during srv6ops
session.
>
> Please read them, attend tomorrow's SRv6ops session or contact me or
> Maria if you are interested.
>
> We are particularly interested in expanding our round of
supporters in
> 3GPP, getting an assessment from you that you may have already
done on
> this topic and studying with you if 3GPP agrees.
>
> Br
>
> Markus
>
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