TS 123 501 - V15.2.0 - 5G; System Architecture for the 5G ...

ETSI TS 123 501 V15.2.0 (2018-06)

TECHNICAL SPECIFICATION

5G; System Architecture for the 5G System (3GPP TS 23.501 version 15.2.0 Release 15)

3GPP TS 23.501 version 15.2.0 Release 15

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ETSI TS 123 501 V15.2.0 (2018-06)

Reference DTS/TSGS-0223501vf20

Keywords 5G

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ETSI TS 123 501 V15.2.0 (2018-06)

Intellectual Property Rights

Essential patents

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Foreword

This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).

The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables.

The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under .

Modal verbs terminology

In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and "cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions).

"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.

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Contents

Intellectual Property Rights ................................................................................................................................2

Foreword ............................................................................................................................................................. 2

Modal verbs terminology....................................................................................................................................2

Foreword ........................................................................................................................................................... 11

1 Scope ......................................................................................................................................................12

2 References ..............................................................................................................................................12

3 Definitions and abbreviations.................................................................................................................14

3.1

Definitions ........................................................................................................................................................ 14

3.2

Abbreviations ...................................................................................................................................................17

4 Architecture model and concepts ...........................................................................................................18

4.1

General concepts ..............................................................................................................................................18

4.2

Architecture reference model ...........................................................................................................................19

4.2.1

General ........................................................................................................................................................ 19

4.2.2

Network Functions and entities ..................................................................................................................19

4.2.3

Non-roaming reference architecture ...........................................................................................................20

4.2.4

Roaming reference architectures.................................................................................................................23

4.2.5

Data Storage architectures ..........................................................................................................................25

4.2.6

Service-based interfaces .............................................................................................................................27

4.2.7

Reference points .........................................................................................................................................27

4.2.8

Support of non-3GPP access.......................................................................................................................29

4.2.8.1

General Concepts to Support Non-3GPP Access..................................................................................29

4.2.8.2

Architecture Reference Model for Non-3GPP Accesses.......................................................................30

4.2.8.2.1

Non-roaming Architecture for Non-3GPP Accesses .......................................................................30

4.2.8.2.2

LBO Roaming Architecture for Non-3GPP Accesses, N3IWF in same PLMN as 3GPP access ....30

4.2.8.2.3

Home-routed Roaming Architecture for Non-3GPP Accesses, N3IWF in same PLMN as

3GPP access ....................................................................................................................................31

4.2.8.2.4

LBO Roaming Architecture for Non-3GPP Accesses, N3IWF in different PLMN from 3GPP

access ............................................................................................................................................... 32

4.2.8.2.5

Home-routed Roaming Architecture for Non-3GPP Accesses, N3IWF in different PLMN

from 3GPP access............................................................................................................................33

4.2.8.3

Non-3GPP Access Reference Points.....................................................................................................34

4.2.9

Network Analytics architecture ..................................................................................................................34

4.3

Interworking with EPC.....................................................................................................................................34

4.3.1

Non-roaming architecture ...........................................................................................................................34

4.3.2

Roaming architecture..................................................................................................................................35

4.3.3

Interworking between 5GC via non-3GPP access and E-UTRAN connected to EPC................................37

4.3.3.1

Non-roaming architecture .....................................................................................................................37

4.3.3.2

Roaming architecture ............................................................................................................................38

4.3.4

Interworking between ePDG connected to EPC and 5GS ..........................................................................40

4.3.4.1

Non-roaming architecture .....................................................................................................................40

4.3.4.2

Roaming architectures...........................................................................................................................41

4.4

Specific services ...............................................................................................................................................43

4.4.1

Public Warning System ..............................................................................................................................43

4.4.2

SMS over NAS ...........................................................................................................................................43

4.4.2.1

Architecture to support SMS over NAS................................................................................................43

4.4.2.2

Reference point to support SMS over NAS ..........................................................................................45

4.4.2.3

Service based interface to support SMS over NAS...............................................................................45

4.4.3

IMS support ................................................................................................................................................45

4.4.4

Location services ........................................................................................................................................46

4.4.4.1

Architecture to support Location Services ............................................................................................46

4.4.4.2

Reference point to support Location Services.......................................................................................46

4.4.4.3

Service Based Interfaces to support Location Services.........................................................................47

4.4.5

Application Triggering Services .................................................................................................................47

5 High level features..................................................................................................................................47

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5.1

General .............................................................................................................................................................47

5.2

Network Access Control ..................................................................................................................................47

5.2.1

General ........................................................................................................................................................ 47

5.2.2

Network selection .......................................................................................................................................47

5.2.3

Identification and authentication.................................................................................................................47

5.2.4

Authorisation ..............................................................................................................................................48

5.2.5

Access control and barring .........................................................................................................................48

5.2.6

Policy control..............................................................................................................................................48

5.2.7

Lawful Interception.....................................................................................................................................48

5.3

Registration and Connection Management.......................................................................................................48

5.3.1

General ........................................................................................................................................................ 48

5.3.2

Registration Management ...........................................................................................................................48

5.3.2.1

General ..................................................................................................................................................48

5.3.2.2

5GS Registration Management states....................................................................................................48

5.3.2.2.1

General ............................................................................................................................................48

5.3.2.2.2

RM-DEREGISTERED state............................................................................................................49

5.3.2.2.3

RM-REGISTERED state.................................................................................................................49

5.3.2.2.4

5GS Registration Management State models ..................................................................................50

5.3.2.3

Registration Area management .............................................................................................................50

5.3.2.4

Support of a UE registered over both 3GPP and Non-3GPP access .....................................................50

5.3.3

Connection Management ............................................................................................................................52

5.3.3.1

General ..................................................................................................................................................52

5.3.3.2

5GS Connection Management states.....................................................................................................52

5.3.3.2.1

General ............................................................................................................................................52

5.3.3.2.2

CM-IDLE state ................................................................................................................................52

5.3.3.2.3

CM-CONNECTED state .................................................................................................................53

5.3.3.2.4

5GS Connection Management State models ...................................................................................53

5.3.3.2.5

CM-CONNECTED with RRC Inactive state ..................................................................................54

5.3.3.3

NAS signalling connection management ..............................................................................................56

5.3.3.3.1

General ............................................................................................................................................56

5.3.3.3.2

NAS signalling connection establishment .......................................................................................56

5.3.3.3.3

NAS signalling connection Release.................................................................................................56

5.3.3.4

Support of a UE connected over both 3GPP and Non-3GPP access.....................................................56

5.3.4

UE Mobility................................................................................................................................................56

5.3.4.1

Mobility Restrictions.............................................................................................................................56

5.3.4.1.1

General ............................................................................................................................................56

5.3.4.1.2

Management of Service Area Restrictions ......................................................................................58

5.3.4.2

Mobility Pattern ....................................................................................................................................58

5.3.4.3

Radio Resource Management functions................................................................................................59

5.3.4.4

UE mobility event notification..............................................................................................................59

5.4

3GPP access specific aspects............................................................................................................................60

5.4.1

UE reachability in CM-IDLE......................................................................................................................60

5.4.1.1

General ..................................................................................................................................................60

5.4.1.2

UE reachability allowing mobile terminated data while the UE is CM-IDLE......................................61

5.4.1.3

Mobile Initiated Connection Only (MICO) mode.................................................................................61

5.4.2

UE reachability in CM-CONNECTED.......................................................................................................62

5.4.3

Paging strategy handling.............................................................................................................................62

5.4.3.1

General ..................................................................................................................................................62

5.4.3.2

Paging Policy Differentiation................................................................................................................62

5.4.3.3

Paging Priority ......................................................................................................................................63

5.4.4

UE Radio Capability handling ....................................................................................................................63

5.4.4.1

UE radio capability information storage in the AMF............................................................................63

5.4.4.2

Void....................................................................................................................................................... 64

5.4.4.2a

UE Radio Capability Match Request ....................................................................................................64

5.4.4.3

Paging assistance information...............................................................................................................64

5.4.4a

UE MM Core Network Capability handling...............................................................................................64

5.4.4b

UE 5GSM Core Network Capability handling ...........................................................................................65

5.4.5

DRX (Discontinuous Reception) framework..............................................................................................65

5.4.6

Core Network assistance information for RAN optimization .....................................................................66

5.4.6.1

General ..................................................................................................................................................66

5.4.6.2

Core Network assisted RAN parameters tuning....................................................................................66

5.4.6.3

Core Network assisted RAN paging information..................................................................................66

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