network slicing architecture in 3gppstd-share.itri.org.tw/content/files/event/files/3... · a ue...

Network Slicing Architecture in 3GPP

Chia-Lin Lai (ICL/V400)

12 September, 2016

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Outline

Network Slicing Concept in NGMN

Network Slicing in 3GPP NextGen TR

Terminology and Definition

Network Slicing Scenarios

Solution Study in NextGen TR

Interim Agreement of Network Slicing in 3GPP

SA2

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Network Slicing in NGMN

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Network Slicing Concept

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Source: NGMN white paper


Network Slicing in 3GPP NextGen TR

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3GPP SA2 NextGen: Network Slicing

NextGen TR (23.799)

Study on Architecture for Next Generation System

(Rel-14)

Key Issue 1:

Support of network slicing

Network slicing is most relevant to overall core

network and RAN design

Major operators and vendors actively involved

in this topic

Qualcomm, Intel, Samsung, LG, CMCC, ZTE, NTT

DCM, Nokia, Orange,, KDDI, Huawei, AT&T,…

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Network Slice: is a concept describing a system

behavior which is implemented via Network Slice

Instance(s)

Network Slice Template (NST): is a logical

representation of Network Function(s) and

corresponding resource requirements necessary

to provide the required telecommunication

services and network capabilities

Network Slice Instance (NSI): is an instance

created from a NST

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Network Slicing in 3GPP SA2

Network slicing enables the operator to create

network customized to provide optimized

solutions for different market scenarios

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Source: Netmanias


Work Tasks in Network Slicing

Network Slice Instance Selection and

Association

Network Slicing Architecture

Network Slicing Roaming Support

Network Slicing Terminology and Definitions

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Network Slicing Scenarios

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Figure D-1: Group A

Figure D-3: Group C

Figure D-2: Group B

Different Scenarios for Network Slicing

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Current Status in NextGen TR

Several solutions in NextGen TR to support

network slicing

Involve three different network slicing scenario

mentioned in previous slides

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Solution 1

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Solution 1 in NextGen TR

Any slicing is not visible

to UE at radio interface

Slice Selection Function

(SSF) Link radio bearers of a UE

with the appropriate core

network instance

No RAN slicing

RAT + PLMN to UEs

Each Network Slice

Instance has a network

slice instance Identifier

(NSI-ID)

Combination of a

common CP NF ID +

slice specific ID

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Solution 2

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Group B network

scenario

UE related NG1+NG2

signalling

Common CP Network

Functions (CCNFs)

One UE is assigned to

CCNF during attach

procedure

UE temporary ID

Default CCNF will be

assigned to UE before

redirecting UE to a

specific CCNF


Solution 3

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Group B network

scenario

Dedicated common CP

plane and Default

common CP plane

AU, MM, CCPSF, NSSF

Common CP Selection

Function (CCPSF)

Network Slice Selection

Function (NSSF)


Solution 4

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Access Control Agent

Select NSIs

Access HSS

UE will be assigned a

temporary ID similar to

S-TMSI when this UE

has been authenticated

by the core network


Network Slice Selection Function (NSSF)

RAN provided or CN provided function

Select an appropriate slice for UE based on UE

provided or CN provided information

Handle UE’s initial attach request

UE’s subscription, UE usage type and service type

Associate UE to a default slices and/or a UE

specified slice type

Handle new service request

Select additional slices for a UE after initial attach

request

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Common CP Network Function

Mobility Management (MM), Authentication

(AU) and Session Management SM) are all

slice specific NFs (Group A scenario)

MM is common CP NF, AU and SM are slice

specific NFs

MM and AU are common CP NFs, and SM is

slice specific NF

Default Common CP Function

Slice-specific/Dedicated Common CP Function

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Parameters in Different Solutions

After attach:

NSI-ID/Slice-ID

CP NF ID

Slice Type

Temporary UE ID

Before attach:

UE usage type (e.g., Car UE, eMBB UE,…)

Service type (e.g., VoIP, Vedio,...)

Dedicated Core Network ID (DCN-ID)

For different UE usage types

Domain Network Name (DNN)

Multi-Dimension Descriptor (MDD)

Tenant ID

Slice type

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Interim Agreement in NextGen TR for

Network Slicing

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Summary

The following bullets are the current status of

agreements on the network slicing: The network slice is a complete logical network (providing

Telecommunication Services and Network Capabilities) including

AN and CN. Whether RAN is sliced is up to RAN WGs to

determine.

AN can be common to multiple network slices.

A UE may provide network slice selection assistance information

to the network.

If a network deploys network slicing, then it may use UE provided

network slice selection assistance information to select a network

slice.

A UE may access multiple slices simultaneously via a single RAN.

In such case, those slices may share some control plane functions,

e.g. MM.

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