Liaison statement
Converged Core and single CUPS architecture

State Posted
Posted Date 2018-10-03
From Contact Lincoln Lavoie
To Groups i2rs, RTG, rtgwg
To Contacts Susan Hares
Jeffrey Haas
Chris Bowers
Jeff Tantsura
Alvaro Retana
Deborah Brungard
Martin Vigoureux
CcDeborah Brungard
Susan Hares
Routing Area Working Group Discussion List
David Sinicrope
Chris Bowers
Martin Vigoureux
Alvaro Retana
The IETF Chair
Russ White
Jeff Tantsura
Interface to the Routing System Discussion List
Response Contact
Purpose For information
Attachments LIAISE-225_ietf-cups_FINAL CORRECTED
In March 2018, BBF sent a liaison to the IETF regarding ‘The Disaggregated
Architecture of BNG in BBF TR-384’. This liaison was for information only and
by no means meant that the BBF had already selected a protocol for use.

The Wireless-Wireline Convergence (WWC) work area of the BBF has embarked on an
effort to specify 5G Fixed Mobile Convergence in collaboration with 3GPP. More
specifically, the BBF is sending to 3GPP requirements on the converged 5G core
interfaces to be addressed in the release 16 timeframe. A part of this
collaboration the BBF work is expected to result in changes to CUPS interfaces
in order to support some BNG functionality. This was not clear to us at the
time of the previous liaison. 3GPP is working on extensions to PFCP as defined
in 3GPP Release 15 (references TS23.214 and TS 29.244 from 3GPP). For
information, 3GPP is conducting a study for Release 16, where there is a
proposal to have a Service Based Interface for N4. Reference TR 23.742 from

The BBF has yet to perform a study on the feasibility of using a single
protocol to allow multi-dimension inter-operability and satisfy the
requirements of both TR-384 and our FMC work. The BBF is studying the two use
cases “BNG disaggregation” and “FMC interworking” to determine if common
requirements and therefore opportunities for engineering re-use. That key
consideration will influence how we view any solutions that independently
emerge in the industry.

We trust this information is useful and welcome further dialog with respect to
the above.