Title: Converged Core and single CUPS architecture
Submission Date: 2018-10-03
URL of the IETF Web page: https://datatracker.ietf.org/liaison/1600/

From: Lincoln Lavoie <[email protected]>
To: Susan Hares <[email protected]>, Jeffrey Haas <[email protected]>,Chris Bowers 
<[email protected]>,Jeff Tantsura <[email protected]>,Alvaro 
Retana <[email protected]>,Deborah Brungard <[email protected]>,Martin 
Vigoureux <[email protected]>
Cc: Deborah Brungard <[email protected]>,Susan Hares <[email protected]>,Routing 
Area Working Group Discussion List <[email protected]>,David Sinicrope 
<[email protected]>,Chris Bowers <[email protected]>,Martin 
Vigoureux <[email protected]>,Alvaro Retana 
<[email protected]>,The IETF Chair <[email protected]>,Russ White 
<[email protected]>,Jeff Tantsura <[email protected]>,Interface to the Routing 
System Discussion List <[email protected]>
Response Contacts: [email protected]
Technical Contacts: 
Purpose: For information

Body: 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 
3GPP.

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.
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