ETSI TS 123 632 V16.2.0 (2020-10)

ETSI TS 123 632 V16.2.0 (2020-10)
TECHNICAL SPECIFICATION
LTE;
5G;
User data interworking, coexistence and migration;
Stage 2
(3GPP TS 23.632 version 16.2.0 Release 16)
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3GPP TS 23.632 version 16.2.0 Release 16 1 ETSI TS 123 632 V16.2.0 (2020-10)
Reference
DTS/TSGC-0423632vg20
Keywords
5G,LTE
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Intellectual Property Rights ................................................................................................................................ 2

Legal Notice ....................................................................................................................................................... 2

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

Foreword ............................................................................................................................................................. 5

1 Scope ........................................................................................................................................................ 7

2 References ................................................................................................................................................ 7

3 Definitions of terms, symbols and abbreviations ..................................................................................... 8

3.1 Terms .................................................................................................................................................................. 8

3.2 Symbols .............................................................................................................................................................. 8

3.3 Abbreviations ..................................................................................................................................................... 8

4 System architecture .................................................................................................................................. 8

4.1 Architecture for direct UDM-HSS interworking ................................................................................................ 8

4.2 Reference points for direct UDM-HSS interworking ................................................................................... 9

4.3 Service based interfaces for direct UDM-HSS interworking ........................................................................ 9

4.4 Subscription Identifiers ...................................................................................................................................... 9

4.5 HSS Discovery and Selection ........................................................................................................................... 10

4.6 UDM Discovery and Selection ......................................................................................................................... 10

4.7 Subscription Profiles ........................................................................................................................................ 10

5 System procedures .................................................................................................................................. 11

5.1 General ............................................................................................................................................................. 11

5.2 Authentication .................................................................................................................................................. 11

5.2.1 General ........................................................................................................................................................ 11

5.2.1 General ........................................................................................................................................................ 11

5.2.2 Vector Generation in HSS .......................................................................................................................... 11

5.2.3 Vector Generation in UDM/ARPF ............................................................................................................. 13

5.2.4 HSS using the Nudr SBI ............................................................................................................................. 14

5.3 5GC-EPC Mobility Scenarios .......................................................................................................................... 15

5.3.1 General ........................................................................................................................................................ 15

5.3.2 Mobility from 5GC to EPC ......................................................................................................................... 15

5.3.3 Mobility from EPC to 5GC ......................................................................................................................... 16

5.4 Scenarios of Interworking with IMS ................................................................................................................ 22

5.4.1 T-ADS ........................................................................................................................................................ 22

5.4.2 P-CSCF Restoration .................................................................................................................................... 24

5.4.3 Network Provided Location Information Request ...................................................................................... 25

5.4.4 User State Retrieval .................................................................................................................................... 26

5.4.5 UE Reachability .......................................................................................................................................... 27

5.4.6 IMEI Retrieval ............................................................................................................................................ 30

5.4.7 SRVCC: IMS AS obtaining SRVCC data .................................................................................................. 31

5.4.8 SRVCC: IMS AS obtaining SRVCC data – HSS using Nudr .................................................................... 31

5.4.9 SRVCC: IMS AS updating STN-SR .......................................................................................................... 32

5.5 SMS Support .................................................................................................................................................... 33

5.5.1 General ........................................................................................................................................................ 33

5.5.2 MT-SMS Routing Information Retrieval .................................................................................................... 33

5.5.3 MT-SMS Delivery Failure .......................................................................................................................... 34

5.5.4 SMS Alerting .............................................................................................................................................. 36

5.5.5 MT-SMS Routing Information Retrieval Over Nudr .................................................................................. 37

5.5.6 Support for SMS over IP ............................................................................................................................ 37

5.5.6.1 General .................................................................................................................................................. 37

5.5.6.2 IP-SM-GW registration and SMS routing information retrieval in 5GC only deployments ................. 37

5.5.6.3 MT SMS delivery failure in 5GC only deployments ............................................................................ 39

5.5.6.4 Alert Service Centre in 5GC only deployments .................................................................................... 40

5.6 Common Network Exposure Scenarios ............................................................................................................ 41

5.6.1 General ........................................................................................................................................................ 41

5.6.2 Configuration of Monitoring Events in MME ............................................................................................ 42

5.6.3 Synchronization of Status of Monitoring Event between HSS and UDM .................................................. 43

6 Network Function Service procedures ................................................................................................... 44

6.1 HSS Services .................................................................................................................................................... 44

6.1.1 General ........................................................................................................................................................ 44

6.1.2 Nhss_UEAuthentication service ................................................................................................................. 45

6.1.2.1 Nhss_UEAuthentication_Get service operation .................................................................................... 45

6.1.3 Nhss_UECM service................................................................................................................................... 45

6.1.3.1 Nhss_UECM_MMEDeregistration service operation ........................................................................... 45

6.1.3.2 Nhss_UECM_Update service operation ............................................................................................... 45

6.1.4 Nhss_SDM service ..................................................................................................................................... 45

6.1.4.2 Nhss_SDM_Notification service operation ........................................................................................... 46

6.1.4.3 Nhss_SDM_Subscribe service operation .............................................................................................. 46

6.1.4.4 Nhss_SDM_Unsubscribe service operation .......................................................................................... 46

6.1.5 Nhss_EE service ......................................................................................................................................... 46

6.1.5.1 Nhss_EE_Subscribe service operation .................................................................................................. 46

6.1.5.2 Nhss_EE_Unsubscribe service operation .............................................................................................. 47

6.1.5.3 Nhss_EE_Notify service operation ....................................................................................................... 47

6.2 UDM Services .................................................................................................................................................. 47

6.2.1 General ........................................................................................................................................................ 47

6.2.2 Nudm_UECM service operation ................................................................................................................. 48

6.2.2.1 Nudm_UECM_P-CscfRestorationTrigger service operation ................................................................ 48

6.2.2.2 Nudm_UECM_Get service operation ................................................................................................... 48

6.2.2.3 Nudm_UECM_AMFDeregistration service operation .......................................................................... 48

6.2.2.4 Nudm_UECM_Update service operation ............................................................................................. 48

6.2.3 Nudm_MT Service ..................................................................................................................................... 48

6.2.3.1 Nudm_MT_ProvideDomainSelectionInfo Service ............................................................................... 48

6.2.3.2 Nudm_MT_ProvideUserState service operation ................................................................................... 48

6.2.3.3 Nudm_MT_ProvideLocationInfo service operation ............................................................................. 49

6.2.3.4 Nudm_MT_Provide5GSRVCCInfo Operation ..................................................................................... 49

6.2.4 Nudm_EE Service ...................................................................................................................................... 49

6.2.4.1 Nudm_EventExposure_Subscribe service operation ............................................................................ 49

6.2.4.2 Nudm_EventExposure_Notify service operation .................................................................................. 49

6.2.5 Nudm_UEAuthentication service ............................................................................................................... 49

6.2.5.1 Nudm_UEAuthentication_GetHssAv service operation ....................................................................... 49

6.2.6 Nudm_SDM service operations .................................................................................................................. 50

6.2.6.1 Nudm_SDM_Get service operation ...................................................................................................... 50

6.2.6.2 Nudm_SDM_Subscribe service operation ............................................................................................ 50

6.2.6.3 Nudm_SDM_Unsubscribe service operation ........................................................................................ 50

6.2.6.4 Nudm_SDM_Notify service operation ................................................................................................. 50

6.2.7 Nudm_PP service operations ...................................................................................................................... 50

6.2.7.1 Nudm_PP_Update service operation..................................................................................................... 50

6.3 UDR Services ................................................................................................................................................... 50

Annex A (informative): Change history ............................................................................................... 51

History .............................................................................................................................................................. 52

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

The contents of the present document are subject to continuing work within the TSG and may change following formal

TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an

y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,

z the third digit is incremented when editorial only changes have been incorporated in the document.

The constructions "shall" and "shall not" are confined to the context of normative provisions, and do not appear in

The constructions "must" and "must not" are not used as substitutes for "shall" and "shall not". Their use is avoided

insofar as possible, and they are not used in a normative context except in a direct citation from an external, referenced,

non-3GPP document, or so as to maintain continuity of style when extending or modifying the provisions of such a

The construction "may not" is ambiguous and is not used in normative elements. The unambiguous constructions

"might not" or "shall not" are used instead, depending upon the meaning intended.

The constructions "can" and "cannot" are not substitutes for "may" and "need not".

will indicates that something is certain or expected to happen as a result of action taken by an agency

will not indicates that something is certain or expected not to happen as a result of action taken by an

might indicates a likelihood that something will happen as a result of action taken by some agency the

might not indicates a likelihood that something will not happen as a result of action taken by some agency

is not (or any other negative verb in the indicative mood) indicates a statement of fact

The present document defines the Stage 2 architecture, procedures, flows and Network Function Services for User Data

The following documents contain provisions which, through reference in this text, constitute provisions of the present

- References are either specific (identified by date of publication, edition number, version number, etc.) or

- For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including

a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same

[8] 3GPP TS 33.401: "3GPP System Architecture Evolution (SAE); Security architecture".

[9] 3GPP TS 33.402: "3GPP System Architecture Evolution (SAE); Security aspects of non-3GPP

[11] 3GPP TS 33.220: "3G security; Generic Authentication Architecture (GAA); Generic

[12] 3GPP TS 24.080: "Mobile radio interface layer 3 supplementary services specification - Formats

[15] 3GPP TS 29.328: "IP Multimedia (IM) Subsystem Sh interface; Signalling flows and message

[16] 3GPP TS 23.682: "Architecture enhancements to facilitate communications with packet data

[18] 3GPP TS 23.204: "Support of Short Message Service (SMS) over generic 3GPP Internet Protocol

For the purposes of the present document, the terms given in 3GPP TR 21.905 [1] and the following apply. A term

defined in the present document takes precedence over the definition of the same term, if any, in 3GPP TR 21.905 [1].

For the purposes of the present document, the abbreviations given in 3GPP TR 21.905 [1] and the following apply. An

abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in

Non-SBA interfaces between the HSS and non-SBA network nodes include interfaces to / from the SMS-

GMSC/IWMSC and SMS Router. In the Architecture for direct UDM-HSS interworking , as a deployment option, these

Figure 4.1-2 shows the reference architecture for direct UDM-HSS interworking using the reference point

Figure 4.1-2: Architecture for Direct UDM-HSS interworking in reference point representation

The 5GS-UDR (Unified Data Repository) and EPS-UDR (User Data Repository) may be collocated, forming a common

NOTE: The HSS is only using the NU2 reference point for the purpose of interworking with 5GS, i.e. NU2 is not

For a list of other SBA reference points supported in 5GC see 3GPP TS 23.501 [2].

For a list of IMS reference points, including SBA IMS reference points, see 3GPP TS 23.228 [7].

For a list of Non-SBA reference points and Network Nodes interfacing the HSS see 3GPP TS 23.002 [3].

The HSS makes use of the Ud reference point to interact with the EPS-UDR. The UDM makes use of the N35 reference

The HSS shall make use of Nudm services as described in clause 6.2 and may make use of Nudr services as described

The UDM shall make use of Nhss services and Nudr services as described in clauses 6.1 and 6.3.

As defined in 3GPP TS 23.501 [2], for interworking with the EPC, the SUPI allocated to the 3GPP UE shall always be

The subscription identifier used over NU1 reference point in Nhss services shall be an IMSI. The UDM extracts the

The subscription identifier used over NU1 reference point in Nudm services shall be a SUPI based on an IMSI. The

HSS creates a SUPI from the user's IMSI or the IMSI associated to the user's public identifier in the EPS or IMS

This clause defines the procedures for HSS discovery and selection by the UDM. The procedures for HSS discovery