Minutes IETF120: dmm: Tue 16:30
minutes-120-dmm-202407231630-00

DMM

Mobility aware Transport Network Slicing for 5G

• shared latest update and requested WG LC
• Q: Asked the author to compare a TEAS draft: realization of 5G
  Network Slice using IP/MPLS technologies (A: showed mapping of SR,
  VLAN, etc.).
• Q regarding WG LC: suggest to coordinate with TEAS: make sure we
  don't redefine anything that has been defined in TEAS
• Q on mobility-aware transport vs. transport-aware mobility

Computing Aware Traffic Steering consideration for Mobile user Plane
Architecture

• Q on clarification: what is session information (including CIS-ID,
  TEID, etc.) shown in one slide? Where to find the CIS-ID in the
  mobile network? (the answer implied the mobile-core (e.g., 5GS)
  would provide it).
• Q: how a PE may get TEID since TEID is in mobile domain while a PE
  is in IP domain? the work is based on DMM MUP architecture. The
  chair suggested to clarify more on CIS-ID, TEID, etc.
• Q on an IETF I.D. 'service metric': still not adopted by IETF,
  currently still an individual draft.

Mobile Traffic Steering

• Q on 'non-routable IP traffic steering'
• Asked the author to compare with LISP since a delegate believed LISP
  could address almost all the issues described in the draft. Lots of
  back-and-forth discussions on LISP (mapping space, transport nodes,
  etc.)
• Q on why the DNN beyond N6 should have the capability to influence
  the re-anchoring? A delegate voluteered some information of 3GPP
  Edge-computing project, in which a KI is working to have external
  metrics influence the choice/re-choice (i.e., anchor/re-anchor) of
  UPF (or called UPA in the draft). Also a UPF could use feedback info
  (varieties of metrics) to select different servers.
• Please be aware that anything proposed here in DMM/IETF, someone has
  to bring the proposal to 3GPP for interwork discussion

MUP evolution:

• add text regarding how CP/UP of the draft might be useful to future
  6G evolution.
• WG having questions on subtle demarcation btwn IETF and 3GPP: like
  what kinds of advisory references could be provided to 3GPP (from
  this IETF draft).
• Asked by DMM co-chair: where is the implementation since this one
  has reached consensus
• WG chairs suggested (a) summarizing all the authors have and then
  send them for alias adoption-call discussion; (b) depend on the
  adoption-call feedback, might send a LS-out for 3GPP’s reference
  toward the beginning of next year.

Emergency Calling (911/112/*) Services over Wi-Fi

• The author ack'ed this draft is not in the DMM charter.
• comments from last IETF-119. The main ideas are how we might extend
  the DMM scope to accommodate the work.
• clarification questions on where IMEI might exist; how to handle
  credentials for mobile-domain authentication vs. wifi-domain.
• Comments on location-based service, IMS call (); signalling is not
  from the mobile domain; the focus is on wifi.
• confirmed no protocol extension; so, one suggestion is to allocate
  the work to 'independent stream'.
• one possible WG is 'ECRIT', but this group has not done the job.

End Marker in DN for Distributed UPF/ANUP

• Regarding buffering vs. faster-network
• Comments on applying MPTCP
• Chair suggestions: if want to do any mobile work in IETF, please be
  sure it is access-agnostic. That is, not specific to 3GPP
  technologies;
• comments from the mobile-traffic steering author on (end-mark)
  buffering mechanism/location. Reply is 'buffering is still in gNB'.