ETSI TS 123 632 V17.2.0 (2022-07)

LTE ;5G ; User data interworking, coexistence and migration; Stage 2 (3GPP TS 23.632 version 17.2.0 Release 17)

RTS/TSGC-0423632vh20

General Information

• Status: Not Published
• Technical Committee: 3GPP CT 4 - MAP/CAMEL/GTP/BCH/SS/TrFO/IMS/GUP/WLAN (formely CN4)
• Current Stage: 12 - Citation in the OJ (auto-insert)
• Completion Date: 18-Jul-2022

Standards Content (Sample)

ETSI TS 123 632 V17.2.0 (2022-07)






TECHNICAL SPECIFICATION
LTE ;
5G ;
User data interworking, coexistence and migration;
Stage 2
(3GPP TS 23.632 version 17.2.0 Release 17)

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3GPP TS 23.632 version 17.2.0 Release 17 1 ETSI TS 123 632 V17.2.0 (2022-07)

Reference
RTS/TSGC-0423632vh20
Keywords
5G,LTE
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All rights reserved.

ETSI

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3GPP TS 23.632 version 17.2.0 Release 17 2 ETSI TS 123 632 V17.2.0 (2022-07)
Intellectual Property Rights
Essential patents
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Legal Notice
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. These shall be
interpreted as being references to the corresponding ETSI deliverables.
The cross reference between 3GPP and ETSI identities can be found under http://webapp.etsi.org/key/queryform.asp.
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.
ETSI

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3GPP TS 23.632 version 17.2.0 Release 17 3 ETSI TS 123 632 V17.2.0 (2022-07)
Contents
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 . 10
4.5 HSS Discovery and Selection . 10
4.6 UDM Discovery and Selection . 11
4.7 Subscription Profiles . 11
5 System procedures . 11
5.1 General . 11
5.2 Authentication . 11
5.2.1 General . 11
5.2.2 Vector Generation in HSS . 12
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 . 16
5.3.3 Mobility from EPC to 5GC . 17
5.3.4 Support for PDU session continuity during intersystem mobility procedures . 18
5.4 Scenarios of Interworking with IMS . 23
5.4.1 T-ADS . 23
5.4.2 P-CSCF Restoration . 24
5.4.3 Network Provided Location Information Request . 25
5.4.4 User State Retrieval . 27
5.4.5 UE Reachability . 28
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 . 32
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 . 35
5.5.4 SMS Alerting . 36
5.5.5 MT-SMS Routing Information Retrieval Over Nudr . 38
5.5.6 Support for SMS over IP . 38
5.5.6.1 General . 38
5.5.6.2 IP-SM-GW registration and SMS routing information retrieval in 5GC only deployments . 38
5.5.6.3 MT SMS delivery failure in 5GC only deployments . 40
5.5.6.4 Alert Service Centre in 5GC only deployments . 41
5.6 Common Network Exposure Scenarios . 42
5.6.1 General . 42
ETSI

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3GPP TS 23.632 version 17.2.0 Release 17 4 ETSI TS 123 632 V17.2.0 (2022-07)
5.6.2 Configuration of Monitoring Events in MME . 43
5.6.3 Synchronization of Status of Monitoring Event between HSS and UDM . 44
6 Network Function Service procedures . 45
6.1 HSS Services . 45
6.1.1 General . 10
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_SNDeregistration service operation . 45
6.1.3.2 Nhss_UECM_Update service operation . 46
6.1.4 Nhss_SDM service . 46
6.1.4.1 Nhss_SDM_Get service operation . 46
6.1.4.2 Nhss_SDM_Notification service operation . 46
6.1.4.3 Nhss_SDM_Subscribe service operation . 47
6.1.4.4 Nhss_SDM_Unsubscribe service operation . 47
6.1.5 Nhss_EE service . 47
6.1.5.1 Nhss_EE_Subscribe service operation . 47
6.1.5.2 Nhss_EE_Unsubscribe service operation . 47
6.1.5.3 Nhss_EE_Notify service operation . 48
6.2 UDM Services . 48
6.2.1 General . 48
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 . 49
6.2.2.4 Nudm_UECM_Update service operation . 49
6.2.3 Nudm_MT Service . 49
6.2.3.1 Nudm_MT_ProvideDomainSelectionInfo Service . 49
6.2.3.2 Nudm_MT_ProvideUserState service operation . 49
6.2.3.3 Nudm_MT_ProvideLocationInfo service operation . 49
6.2.3.4 Nudm_MT_Provide5GSRVCCInfo Operation . 50
6.2.4 Nudm_EE Service . 50
6.2.4.1 Nudm_EventExposure_Subscribe service operation . 50
6.2.4.2 Nudm_EventExposure_Notify service operation . 50
6.2.5 Nudm_UEAuthentication service . 50
6.2.5.1 Nudm_UEAuthentication_GetHssAv service operation . 50
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 . 51
6.2.6.4 Nudm_SDM_Notify service operation . 51
6.2.7 Nudm_PP service operations . 51
6.2.7.1 Nudm_PP_Update service operation. 51
6.3 UDR Services . 51
Annex A (informative): Change history . 52
History . 53

ETSI

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3GPP TS 23.632 version 17.2.0 Release 17 5 ETSI TS 123 632 V17.2.0 (2022-07)
Foreword
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
identifying change of release date and an increase in version number as follows:
Version x.y.z
where:
x the first digit:
1 presented to TSG for information;
2 presented to TSG for approval;
3 or greater indicates TSG approved document under change control.
y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,
updates, etc.
z the third digit is incremented when editorial only changes have been incorporated in the document.
In the present document, modal verbs have the following meanings:
shall indicates a mandatory requirement to do something
shall not indicates an interdiction (prohibition) to do something
The constructions "shall" and "shall not" are confined to the context of normative provisions, and do not appear in
Technical Reports.
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
referenced document.
should indicates a recommendation to do something
should not indicates a recommendation not to do something
may indicates permission to do something
need not indicates permission not to do something
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.
can indicates that something is possible
cannot indicates that something is impossible
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
the behaviour of which is outside the scope of the present document
will not indicates that something is certain or expected not to happen as a result of action taken by an
agency the behaviour of which is outside the scope of the present document
might indicates a likelihood that something will happen as a result of action taken by some agency the
behaviour of which is outside the scope of the present document
ETSI

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3GPP TS 23.632 version 17.2.0 Release 17 6 ETSI TS 123 632 V17.2.0 (2022-07)
might not indicates a likelihood that something will not happen as a result of action taken by some agency
the behaviour of which is outside the scope of the present document
In addition:
is (or any other verb in the indicative mood) indicates a statement of fact
is not (or any other negative verb in the indicative mood) indicates a statement of fact
The constructions "is" and "is not" do not indicate requirements.

ETSI

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3GPP TS 23.632 version 17.2.0 Release 17 7 ETSI TS 123 632 V17.2.0 (2022-07)
1 Scope
The present document defines the Stage 2 architecture, procedures, flows and Network Function Services for User Data
Interworking, Coexistence and Migration within the 5G System.
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
- References are either specific (identified by date of publication, edition number, version number, etc.) or
non-specific.
- For a specific reference, subsequent revisions do not apply.
- 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
Release as the present document.
[1] 3GPP TR 21.905: "Vocabulary for 3GPP Specifications".
[2] 3GPP TS 23.501: "System Architecture for the 5G System; Stage 2".
[3] 3GPP TS 23.002: "Network Architecture".
[4] 3GPP TS 23.380: "IMS Restoration Procedures".
[5] 3GPP TS 23.502: "Procedures for the 5G System; Stage 2".
[6] 3GPP TS 33.501: "Security Architecture and Procedures for 5G System".
[7] 3GPP TS 23.228: "IP Multimedia Subsystem (IMS); Stage 2".
[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
accesses".
[10] 3GPP TS 33.203: "3G security; Access security for IP-based services".
[11] 3GPP TS 33.220: "3G security; Generic Authentication Architecture (GAA); Generic
Bootstrapping Architecture (GBA)".
[12] 3GPP TS 24.080: "Mobile radio interface layer 3 supplementary services specification - Formats
and coding".
[13] 3GPP TS 23.237: "IP Multimedia Subsystem (IMS) Service Continuity".
[14] 3GPP TS 23.008: "Organization of subscriber data".
[15] 3GPP TS 29.328: "IP Multimedia (IM) Subsystem Sh interface; Signalling flows and message
contents".
[16] 3GPP TS 23.682: "Architecture enhancements to facilitate communications with packet data
networks and applications; Stage 2".
[17] 3GPP TS 23.040: "Technical realization of the Short Message Service (SMS)".
[18] 3GPP TS 23.204: "Support of Short Message Service (SMS) over generic 3GPP Internet Protocol
(IP) access; Stage 2".
ETSI

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3GPP TS 23.632 version 17.2.0 Release 17 8 ETSI TS 123 632 V17.2.0 (2022-07)
3 Definitions of terms, symbols and abbreviations
3.1 Terms
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].
3.2 Symbols
Void
3.3 Abbreviations
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
3GPP TR 21.905 [1].
5GS UDR 5G Unified Data Repository
EPS UDR EPS User Data Repository
4 System architecture
4.1 Architecture for direct UDM-HSS interworking
Figure 4.1-1 shows the reference architecture for direct UDM-HSS interworking.
NF UDM
NF NF
Nudm
other 5GC SBA interfaces Nudr
Nhss
5GS-UDR
Ud
EPS-UDR
HSS
IMS SBA interfaces Non-SBA interfaces
SBA IMS non-SBA
network network
nodes nodes

Figure 4.1-1: Architecture for Direct UDM-HSS interworking
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
Non-SBA interfaces may either be supported by the HSS or by the UDM.
Figure 4.1-2 shows the reference architecture for direct UDM-HSS interworking using the reference point
representation.
ETSI

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3GPP TS 23.632 version 17.2.0 Release 17 9 ETSI TS 123 632 V17.2.0 (2022-07)
EPS-UDR
5GS-UDR
N35 NU2
Ud
NU1
UDM HSS
S6a/S6d/ Cx/Sh
N8/N10/N13/
N21/N52/NL6 SWx/. N70/N71
N26
5GC EPC IMS

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
repository.
NOTE: The HSS is only using the NU2 reference point for the purpose of interworking with 5GS, i.e. NU2 is not
a replacement of the Ud interface.
4.2 Reference points for direct UDM-HSS interworking
The following reference points are realized by service-based interfaces:
NU1: Reference point between the HSS a
...