what is network convergence and why do we need it? · on the wireless and wireline convergence for...
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© British Telecommunications plc 2018
What is network convergence and why do we need it?
Maria CuevasIEEE Broadband Multimedia Systems and Broadcasting 20187th June 2018
© British Telecommunications plc 2018
Contents
Types of convergence
What is network convergence
Benefits to user experience
Architectural vision
Work in standards
© British Telecommunications plc 2018
Types of convergenceConvergence is a broad topic , different forms of convergence leverage different assets across fixed and mobile domains.
Products & Services1
Channels to Market2
CustomerService3
Platform4
Network5
Location based insight Combined management and operations
Converged Video Networks
Hybrid Routers
Identity Management & Authentication
Combined Analytics
Unified Contact Centres Social MediaSingle Portal
Stores
Service While-u-wait
Universal Loyalty
5G/FWA
A unified platform architecture enabling services across multiple networks
Combing the way we sell services to our customers
An omni-channel approach to enhance customer experience
Seamless user experience and network optimisation - use of best available network
Upsell in-situ
SDN+NFV Converged Software CDN
PooledData Converged Media
Universal Parental Controls
Service bundles
Aggregating consumption of fixed and mobile services
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What is “network” convergence…. and what can it offer to end users and operators?
PCP
FTTC
Mobile access (4G, 5G, macro, small cell)
Fixed access:Broadband, superfast, ultrafast
Internet
Operator Services
Converged Core
Back/front-haulAggregation Tx
Customer Domain
Private Services
Core Tx
Simultaneous or alternative access to fixed and/or mobile
depending on user needs
No human intervention to move between access
networks
Consistent user experience/access to all services regardless of access network
Public (Internet) Services
Local Services
Single 5G core to manage fixed and
mobile access
• Best possible customer experience• Single set of identities and
credentials• Consistent policies and services• Best available network for
bandwidth and latency• Seamless mobility
Seamless User Experience Network optimisation
• Best use of networks• Improved reliability• Asset reuse• Simplified OSS• New service and revenue
opportunities
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Converged use cases
Hybrid Broadband
Multi-connected Broadband
Multi-access private network
• Bandwidth boost• Failover• Fast provisioning• Symmetric Bandwidth
• Consistent user experience• Bandwidth boost• Failover• Symmetric Bandwidth
• Unified set of identities• Consistent set of policies• Single service set• Access to Intranet / LAN• Seamless mobility
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BT – Nokia Bell Labs Research Proof of Concept: best available user experience
Access throughput measured at the core multi-path proxy
Multi-connected Broadband
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However, not every service requires convergence…cost effectiveness is key A fully converged 5G architecture needs to be modular and flexible
To• 5G centric with common
infrastructures
• Reduced costs
• Service extension across fixed and mobile easy
• Enables development new converged services
From• 4G centric with separate
infrastructures.
• Service extension across fixed and mobile complex
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BroadBand Forum - co-existence, interworking and integration models
Figure 7-1. Wireline Access with a Converged Core network
Source: SD-407 5G Fixed Mobile Convergence Study Broadband Forum
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BroadBand Forum - co-existence, interworking and integration models
Figure 7-1. Wireline Access with a Converged Core network
Source: SD-407 5G Fixed Mobile Convergence Study Broadband Forum
Fixed Mobile Interworking Function
Subscription management ,
Authentication, IP management performed
by the Wireline Core
Residential Gateway remains unchanged
(no 5G support)
5G operator can deliver wireline services over a
wholesale wireline network
InterworkingFMIF
RG
Wireline AN
Wireline Core Network
5G Core
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BroadBand Forum - co-existence, interworking and integration models
Figure 7-1. Wireline Access with a Converged Core network
Source: SD-407 5G Fixed Mobile Convergence Study Broadband Forum
5GRG
Wireline AN
5G CoreNG RAN
5GAGF 5G Access Gateway
Function
End Points must be 5G-capable
The 5G Core performs all core network functions (authentication, session management, subscriber management etc.) (no separate wireline core required)
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BroadBand Forum - co-existence, interworking and integration models
Figure 7-1. Wireline Access with a Converged Core network
Source: SD-407 5G Fixed Mobile Convergence Study Broadband Forum
Co-existence
Multiple models can be deployed by the same
operator, including simultaneous support of
multiple models on a single customer premise
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3GPP – trusted and untrusted non-3GPP access integration models
Untrusted Non-3GPP AccessUE
N3IWF
3GPP Access
Data Network
HPLMN
Non-3GPP Networks
UPFN3 N6
Y1
Y2
AMF SMFN2
N2N4
N3
NWu
N11
N1
N1 N3IWF
Non-3GPP InterWorkingFunction
Untrusted = Does not require integration , partnership or awareness between the wireline and wireless access networks
Release 15 – TS 23.501 System Architecture for the 5G System; Stage 2
Tunnelling is typically established between UE and 5G Core (N3IWF) over the untrusted network
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3GPP – trusted and untrusted non-3GPP access integration models
Release 16 – TR 23.716 Study on the Wireless and Wireline Convergence for the 5G system architecture
5G-RG UPF
3GPP UE
DN
N1
W-5GAN
N4
N3 N6
AMF SMF
N1
N1
AFPCF UDMNRFNEF
AUSF
Nausf Namf Nsmf
NpcfNnrfNnef NudmNaf
NSSF
Nnssf
NG RAN
N3
N2
FAGF
N2
Wireline AN
UE
3GPP Access
Data NetworkUPF
N3
N6
NWt
AMF SMFN2
N2N4
N3
N11
N1
N1
TrustedNon-3GPP
AccessPoint
TrustedNon-3GPPGatewayFunction
TNAP TNGF
Trusted Non-3GPP Access Network (TNAN)
Yt
Fixed Access Gateway Function
Trusted non-3GPP
Gateway function
Work in Progress : similar approach to BBF’s integration model (5G AGF) no need for a separate wireline and
wireless core, the 5G core performs all functions for all access types.
NOTE: an equivalent architectural solution to the BBF’s interworking model (using FMIF) is also within scope of this 3GPP study item but
solutions are yet to be proposed
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3GPP – Access Traffic Splitting, Steering and Switching
UEUntrusted Non-3GPP Access
3GPPAccess
DataNetworkN3IWF
UPF
AMFSMF PCF
AF
AUSFUDM
N2
N3
N3
N2N14
N1N15
N6
N4
N13
N12 N10N8
N5N7N11
N9
Y1
Y2N1 NWu
UE-AT3SF
UPu-AT3SF
CP-AT3SF PC-AT3SF
UDR-AT3SF
N25
UPc-AT3SF
Release 16 - TR 23.793 Study on Access Traffic Steering, Switch and Splitting support in the 5G system architecture
AT3S
Device support
AT3S
Steering: selects an access network for a new data flow and transfers the traffic of this data flow over the selected access network.
Switching: moves all traffic of an ongoing data flow from one access network to another access network in a way that maintains the continuity of the data flow.
Splitting: splits the traffic of a data flow across multiple access networks. When traffic splitting is applied to a data flow, some traffic of the data flow is transferred via one access and some other traffic of the same data flow is transferred via another access.
Handling User Plane traffic
AT3S
AT3S AT3S
Associated Control Plane functions
NOTE: ATSSS support for trusted non-3GPP access is expected to be supported once trusted non-3GPP access is fully specified.
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Architectural Target: a fully modular and flexible deployment model
AT3S
AT3S
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Summary and Conclusions
5G presents an opportunity for industry to define a flexible and modular architecture allowing network providers to operate and manage a single 5G core network supporting all access types (= network convergence).
Network Convergence has to be economically viable, not just an architectural dream – cost optimisation is key.
Current reality is that : the current cost-base of fixed and mobile networks is radically different not all services need or benefit from convergence
Hence, the 5G architecture should enable operators to deploy a single 5G core network including: Fully converged Fixed-only and, Mobile-only
network slices.
The 5G architecture needs to offer enough flexibility for operators to define their own migration path, maximising their ability to offer new services whilst maintaining cost effectiveness.
It is key that the BroadBand Forum and 3GPP (amongst others) work together to achieve this vision.
© British Telecommunications plc 2018
Thank you
Maria Cuevas