Work in progress

5G Fixed-Mobile Convergence

The 5G Fixed-Mobile Convergence work investigates important issues that impact design, implementation, deployment and operations of 5G in the broadband ecosystem. These issues closely relate to significant business opportunites. The work is being done in collaboration with other industry bodies such as 3GPP. Your participation is strongly encouraged.

The 5G Transport work addresses the requirements and anticipated migration of the 5G transport network to accommodate the anticipated new demands generated by the introduction of 5G globally.

Public Resources


  • Coexistence strategy: enables stress-free, market-paced migration from installed to new services
  • Interworking: home access to 5G Core components
  • 5G Fixed Mobile Convergence

The purpose of this work is to investigate common interfaces for the Access Network and Core Network, to support converged wireline-wireless networks that use the 5G core network. It studies the N1, N2 and N3 interfaces in order to provide detailed feedback to 3GPP in the context of 5G Fixed networks (as recommended by the joint 3GPP-BBF 2017 Workshop) and to facilitate 3GPP work in this area 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 operator requirements for interworking of existing fixed access subscribers and deployed equipment into a 5G core.

The study includes the examination of the following

  • Registration and Connection Management Procedures
  • Transport and Encapsulation in the Wireline Access of Control Plane (eg. NAS) and User Plane Traffic Exchanged with 5G Core
  • Regulatory Requirements
  • Operational Requirements
  • Resource Management in the Access
  • Session Management
  • Addressing for IPv4 and IPv6
  • Home LAN Support
  • IPTV and Multicast
  • Network Slice Selection
  • QoS and Policy Management


5G Transport – The Foundation of the 5G Network 

5G is slated to support masses of new devices, upgraded mobile phones and require extraordinary bandwidth and matching investment by operators and equipment manufacturers. The questions that the Forum are investigating include:

  • Will the current transport network support the requirements of 5G?
  • What routing & transport enhancements will be required for 5G covering capacity, performance reliability & determinism?
  • What are the key recommendations should be made to the industry?

The forum’s work is based on more than a decade of related work as the industry has migrated from mobile generation to mobile generation. This page touches briefly on those highlights

5G Requirements

  • Bandwidth, capacity
    • Gigabit speeds vs. megabit speeds
  • Performance
    • Latency
    • Loss
    • Delay variation
  • Reliability
    • Availability and resistance to failure
    • Isolation from interference
  • Scalability
    • Billion users and connected devices


End-to-End Network Slicing

SD 406 End-to-End Network Slicing

This work investigates the concept of network slicing with respect to the BBF architecture. Network slicing is considered as a fundamental enabler to migrate “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.In particular, this project has the following objectives:

  • Address business needs for network slicing
  • Identify and analyze potentially relevant slice types to be supported in the BBF MSBN
  • Study existing work on network slicing of other industry bodies incl. ONF Architecture WG, 3GPP SA2/SA5, ITU-T, IETF, ETSI ISG NFV / MEC, 5GPPP Architecture WG, etc.
  • Provide the foundations to cooperate with other industry and standards developing organizations, particularly 3GPP SA2 and 3GPP SA5, as needed.
  • Identify specifications to address any potential gaps to support the identified network slice types provided on MSBN including any potential extensions to enable network slicing

This study explores network slicing considering a combined network and cloud resource allocation, customized to address specific business demands in a flexible and dynamic manner combining federated resources across multi-domains and transport/IP technologies. Various network slicing related operations should also be considered including for instance instantiation and orchestration procedures, multi-domain support as well as simultaneous connectivity to multiple network slices, without this list being exhaustive.

This work is intended to serve as a first step of a framework for enhancing the current MSBN in order to be able to accommodate end-to-end network slices across multiple administrative and/or heterogeneous transport/IP technology domains. From a BBF point of view, network slicing will be a significant capabilitiy for the delivery of innovative, ultra-fast, hyper-connected and valuable-added services supporting the BB20/20 vision.


The scope of this project is centered on the requirements for end-to-end network slicing including:

  • Identify umbrella use cases with relevance to the BBF MSBN, including the traditional and virtual RG/BG scenarios.
  • Identify relevant business entities
  • Identify relevant network slicing new entities and/or functions and assess their architectural impact
  • Identify transport and routing related operations, e.g. flexibility, on-demand provision, QoS, etc., and assess their architectural impact
  • Identify slicing-related security and privacy issues that may have to be resolved.
  • Identify network slice operation including, isolation e.g. at layer 2, extending VLAN tagging to the home
  • Consider how an SLA/business request shall be placed to enable a slice
  • Consider the components that support a slice request and how it should be mapped into network resources (e.g. using a slice template, via VNF/SDN means, via decomposing VNFs, i.e. Cloud CO, etc.)

This work is being progressed as members-only Study Document SD-406.

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