CONFIG Control Plane Architecture for 5G Systems Riccardo - - PowerPoint PPT Presentation

CONFIG

Control Plane Architecture for 5G Systems

Riccardo Trivisonno, Huawei Technologies

5G-PPP WS, Network Slicing and C-Plane Architecture and SDN for 5G Athens, February 6th and 7th, 2017

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Presentation Outline

• Project Objectives
• Project Achievements and Relationship to Network Slicing
• Open Issues and Next Steps

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Slicing Concept Looming

Project Objectives

To build 5G on top of the key High Level Requirements at the time the project proposal was written (‘14) , CONFIG identified 4 key objectives:

Develop a 5G modular functional framework

(Architecture Flexibility / Vertical Integration)

Conceive an access-agnostic 5G Core Network

(Heterogeneous Access Integration)

Develop a Context Information framework

(Providing Smart/Tailored Connectivity)

Lead standardisation future paths, impacting on 3GPP, IETF, ONF

(Impact on Real Systems)

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Key Network Slicing enabler

Project Objectives: Architecture Modularisation

Zooming-in the Control Plane Modularisation as design principle, allowing flexibility and Verticals integration

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Presentation Outline

• Project Objectives
• Project Achievements and Relationship to Network Slicing
• Open Issues and Next Steps

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Project Achievements: 5G Modularised Architecture, Supporting Network Slicing

Network Functions and Interfaces Context Awareness Framework

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Logical Architecture Management Control/User Plane Infrastructure

Consolidated Definitions, NGMN, Jan’16

 Network Slice Blueprint: A complete description of the structure, configuration and the plans/work flows for how to

instantiate and control the Network Slice Instance during its life cycle

 Network Slice Instance: a set of network functions, and resources to run these, forming a complete instantiated logical

network to meet certain network characteristics required by the Service Instance(s)

CONFIG Definition and Scope of Network Slicing:

 A network slice is an independent logical network, defined by the interconnection of a set of basic building blocks,

composing both C-plane and D-plane, and which can be independently instantiated and operated over a set of physical infrastructure, to support the communication service requirements of a particular or multiple use cases.

 End to End: a network slice spanning all the components of the communication system needed to provide devices with

the requested communication service

Relationship to Network Slicing Definitions and Lifetime

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Relationship to Network Slicing: Example: mIoT Network Slice

ViD 1

• 7. VD ADD

allocation

• 1. Connection Request
• 2. Connection Ack
• 3. Connection Complete
• 4. Connectivity Request Fwd
• 5. Credential Verification
• 6. Credential Verification OK
• 9. Aggregate CN Bearer Establishment
• 10. Connectivity Request Ack
• 11. Connection Reconfiguration
• 12. Connection Reconfiguration Ack
• 8. VD ADD to Ext Add Translation Rule

ViD 1

• 7. ViD Add

association

• 1. Connection Request
• 2. Connection Ack
• 3. Connection Complete
• 4. Connectivity Request Fwd
• 5. Credential Verification
• 6. Credential Verification OK
• 8. Connectivity Request Ack
• 9. Connection Reconfiguration
• 10. Connection Reconfiguration Ack

ViD 1

• 1. Data To Send
• 2. UL Data Token Grant
• 3. Data Packet
• 4. Data Packet Fwd

ViD 1

• 1. Data Received
• 3. Data Ready
• 2. Data Packet Fwd
• 4. Ready to Receive
• 5. Data Transmission

C-plane Architecture C-plane Procedures

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Relationship to Network Slicing: Standardisation (3GPP SA2 Perspective)

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A Network Slice is a complete logical network made up of Access and Core Network Components

Common CP NFs {CCNF)

…

CP NFn CP NF1

…

UP NFn UP NF1 UE 1 RAN

…

CP NFn CP NF1

…

UP NFn UP NF1

…

CP NFn CP NF1

…

UP NFn UP NF1

NSS AI

CP AMF

CP SM F UP UP F NG4 NGsmf NG3

RA N

UE 1 NG2 NG1 CCNF NSI DN NG6 RAN SLICE

• Slices are selected based on NSSAI provided by the

UE

• RAN selects a CCNF (AMF/NSSF) based on the

NSSAI

• An NSSAI can generate multiple Network Slices
• An AN can be common to all slices
• The NSSAI includes at least: SST and SD
• CCNF Redirection can be done at RAN or CCNF
• SMF Selection is based on:
• NSSAI (Provided by the UE), UE Subscription

Info, DNN and Local Operator policies

• SM-NSSAI can be associated to an application
• Data is routed to the PDU sessions associated to

the SM-NSSAI

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Relationship to Network Slicing: Standardisation (3GPP SA2 Perspective)

Network Slicing was NOT the focus of SA2 118 bis … Network Slicing embedded in other procedures

• It is not decided whether NSSF is a separate function or a

component within AMF

• Slicing is not a mandatory feature, but AMF is always

required

• NSSF can be accessed even before an AMF has been

selected

• It is not decided whether Network Slicing should be

addressed as a separate feature or part of existing procedures

• Should NS have its own clause within the TS?
• To be determined during normative phase what Slice-

related info is to be used for NF selection

• E.g., Is the NSSAI used as an input to NF selection?
• It is not clear how Network Slicing is handled in a Roaming

scenario

CP AMF UE 1 NG 1

CCNF

CP NSSF

• 4. NF Access

NF_A instance NF Repository Function

Determine to access the function of NF_B

• 1. NF Discovery Request (Function type of NF_B,

service related parameters)

• 2. Check whether the

request is allowed

• 3. NF Discovery Response

NF_B instance

Thank You!

Riccardo Trivisonno, PhD riccardo.trivisonno@huawei.com