Mission Statement

Broadband Forum is taking an important role in developing 5G, continuing the productive cooperation with 3GPP, and making recommendations for the connection points between the fixed and 5G mobile core networks in order to drive core convergence.

This Work Area addresses the needs of operators, which have wireline or mobile networks deployed so they can leverage their assets with combined subscriber offerings with a converged core. It incorporates capabilities from the 5G toolkit to realize a variety of use cases, including topics such as multi-/hybrid access, enhanced work from home, access sharing scenarios and convergence of voice with the mobile system. 

Work Area Directors: Christele Bouchat (Nokia), Manuel Paul (DT)

Business Impact

The advent of 5G is seen by operators as an opportunity to converge the fixed and mobile side of their networks beyond structural convergence, where fixed and mobile functions coexist over a shared infrastructure (e.g., Cloud CO). In particular, functional convergence provides a single control plane for wireline and wireless sessions. Motives for convergence are varied but include:

  • Offering their customers a seamless, access-independent service experience
  • Enabling multi-access connectivity
  • Streamlining the set of network functions required to operate their network
  • Achieving common technology, on-boarding, training and services between fixed and mobile divisions
  • Enabling common subscriber management
  • Extending the geographical reach of their 5G core networks
  • Extending the service offering of their fixed access

 This is in addition to the new service capabilities enabled by the 5G Core (5GC).

The principle impact on the market addresses the ability to create seamless connectivity to either wireline or wireless access connectivity from single or multi-tenant business and residential locations that will radically alter users' network experience. This is the next step in the evolution from the automatic connectivity to available Wi-Fi networks and will become the norm with the advent of 5G. This work will allow converged operators to provide a uniform experience to their customers irrespective of the access or appliance they are using, supported by a common and streamlined back office and control plane.

Scope

Wireless-Wireline Convergence (WWC) requires a substantial architecture and operation transformation, as some assets become shared, instead of being dedicated per access type. This transformation has to account for the large installed base of wireline subscribers, as a result, broadband line migration is a major aspect of 5G WWC Architecture.

The Broadband Forum works in cooperation with 3GPP to define how fixed access can integrate with the 5G core. The key concerns raised by operators and embodied in the work are:

  1. The fact that no two operators will have the same starting point in the journey to 5G.
  2. The need to eliminate as many dependencies as possible so that transformation steps can be implemented without major coordination between network domains.
  3. The need for deployment flexibility in how 5G components are introduced into the network.

The 5G WWC architecture includes the set of functions and interfaces that realizes the use cases targeted by the BBF and 3GPP for the 3GPP Release 16 and beyond, including network functions for adapting wireline access onto the 5G Core.

It enables several deployment scenarios, which are described in this document, to support different network environments, starting points and priorities, with different cases in terms of Residential Gateway (RG) type, access networks and interfacing model with the 5G Core. As part of these scenarios, devices supporting 3GPP procedures, connected to the RG via the Wi-Fi in the LAN and/or over the RAN, may also access the 5G core network. Information elements that are common to multiple BBF specified functions in the 5G WWC architecture are defined.

Project Streams (PS)

Active Project Streams

Project Stream

Description

PS Leadership

Non-PS Assigned

Projects that don’t fit under the scope of an existing Project Stream or if they fit under the scope of more than one Project Stream, are developed under the Non-PS Assigned category. 

Christele Bouchat , Nokia

Manuel Paul , Deutsche Telekom


Project Stream

Description

PS Leadership

5G

This stream addresses convergence between wireline and wireless networks, including leveraging a converged 5G Core network and network slicing, in cooperation with 3GPP, aligned with 3GPP release plan.

Project Stream

Description

PS Leadership

IMS for 5G-RG

Provide a profile of IMS behavior suitable for RGs attached to a 5G system, designed to maximize operational and procedural commonality with practices and the architecture of voice services in the mobile network.

Martin Taylor , Microsoft


Completed PS

Project Stream

Description

PS Leadership

Converged Policy and Control  


Project Stream

Description

PS Leadership

Hybrid Access

This stream addresses broadband services over dual accesses (wireline and wireless).

Wireless-Wireline Convergence Email List:

WWC Meetings:


Quick Links:


Active WWC Projects


WT/MD/SD#

5G PS
Projects

Abstract

Related Contributions

Editor(s)

WT-457FMIF Functional RequirementsWT-457 provides a detailed specification of the 5G-FMIF and its functional requirements that are necessary to support the interworking between the BBF wireline access networks and 3GPP 5G networks and to enable FN-RGs to use services that are based on 3GPP 5G core network.Contributions
WT-458

CUPS for 5G FMC

This project specifies Control Plane (CP) and User Plane (UP) Separation (CUPS) requirements to support 5G Fixed Mobile Convergence (FMC). Contributions

WT/MD/SD#

IMS for 5G-RG PS
Projects

Abstract

Related Contributions

Editor(s)

WT-493Architecture


WT-494Residential Voice Requirements







CompletedWWC Projects

WT/MD/SD#

Non-PS Assigned  Projects

Abstract

Related Contributions

Editor(s)

SD-373

5G Requirements and Enablers

SD-373 investigates the potential of 5G in the BBF providing a gap analysis and recommendations for further technical studies. It elaborates 5G use cases considering other standardization bodies including NGMN, 3GPP, ITU and 5GPPP and analyzes the 5G technical enablers focusing on (i) unified control plain (FMC), (ii) function (de)composition and allocation (NFV), (iii) network slicing considering SDN and NFV aspects (iv) transport networks focusing on backhaul and fronthaul and (v) edge computing.

JIRA contributions

Konstantinos Samdanis, Huawei Technologies

WT/MD/SD#

5G PS
Projects

Abstract

Related Contributions

Editor(s)

WT-470 Issue 2

5G Wireless Wireline Convergence Architecture



WT-456 Issue 2AGF Functional Requirements

TR-124i7

Functional Requirements for Broadband Residential Gateway Devices


WT-124 Issue 6
A 5G-RG will be a residential gateway fully compliant with the Wireless Wireline Converged (WWC) 5G Core described in SD-407 (BBF) and 23.716 (3GPP). Contributions
WT-181 Issue 2 Amendment 13Data model support for 5G-RGWT-181i2a13 Issue 2 defines version 2 of the Device data model (Device:2). ContributionsKlaus Wich
WT-4705G WWC ArchitectureEnd-to-end architecture view also known as the "Rosetta Stone" for WWC.Contributions
WT-456AGF functional requirements

The scope of this working text is to describe the functional requirements of the Access Gateway Function (AGF). The AGF resides in between the aggregation network of fixed access nodes such as OLTs or DSLAMs, the V-interface (specified by BBF TR-178) and the 5G Core network (specified by 3GPP). It serves both FN-RG as well as 5G-RG.

Contributions

SD-406

End-to-End Network Slicing

The purpose of this study is to investigate the concept of network slicing with respect to the BBF MSBN architecture. Network slicing is considered as a fundamental enabler the BBF MSBN needs to support in order to move from the paradigm of “one architecture fits all” to the logical “network per service”. Network slicing will enable value creation for vertical segments that lack physical network infrastructure, by offering network and cloud resources.

JIRA contributions

Konstantinos Samdanis, Huawei Technologies

SD-407

5G Fixed Mobile Convergence

The purpose of this study is to find common interfaces for the AN and CN, to support converged wireline-wireless networks that use the 5G CN. 

This project will study N1, N2 and N3 interfaces and provide detailed feedback to 3GPP in the context of 5G Fixed (as recommended by the joint 3GPP-BBF Workshop), to let 3GPP evaluate how to proceed with this as swiftly as possible. 

This project will specify of a 5G Access Gateway Function (AGF) that adapts fixed access onto the 5G core, and then consider and specify several architectural deployment options as well as the underlying infrastructure sharing aspects. 

It will also devise strategies and develop specifications to address a desire by a number of operators for interworking of existing fixed access subscribers and deployed equipment into a 5G core.

With the outcome of this project, BBF will provide recommendations for 5G system architectural and functional integration related to highlighted/identified convergence items during the joint 3GPP-BBF Workshop.

JIRA contributions

Peng Shuping, Huawei Technologies

Christele Bouchat, Nokia

SD-4205G Fixed Mobile Convergence Study 5G Fixed Mobile Convergence Study (External). Addresses considerations and challenges on unified CUPS protocol for CloudCo and WWC.Contributions

WT/MD/SD#

Converged Policy and Control Projects

Abstract

Related Contributions

Editor(s)

SD-357

Combined 3GPP and BBF Functions

This document contains the results of the study on 3GPP-BBF Common Functions, that is performed in a stepwise approach, addressing the following business needs:

1 – Identification of common network functions between the 3GPP and BBF domains is a necessity

2 –Analysis of virtualization aspects of identified common functions, as an enabler for future study in the area of

Virtualized Network Functions (VNFs) and Network Function Virtualization Infrastructures (NFVI), destined for mobile and fixed networks.

The results of this work in the BBF serve as a foundation for further collaboration opportunities with the 3GPP and with the ETSI ISG NFV.

JIRA contributions

WT/MD/SD#

Hybrid Access Projects

Abstract

Related Contributions

Editor(s)

WT-378 

Hybrid Access Nodal Requirements

The purpose of  is to define nodal requirements in support of TR-348 Hybrid Access broadband networks, which will enable service providers to offer higher throughput and reliability services to their subscribers by means of simultaneous use of fixed broadband and 3GPP access networks.

 JIRA contributions