ETSI TS 124 526 V15.3.0 (2019-07)

ETSI TS 124 526 V15.3.0 (2019-07)






TECHNICAL SPECIFICATION
5G;
User Equipment (UE) policies for 5G System (5GS);
Stage 3
(3GPP TS 24.526 version 15.3.0 Release 15)

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3GPP TS 24.526 version 15.3.0 Release 15 1 ETSI TS 124 526 V15.3.0 (2019-07)



Reference
RTS/TSGC-0124526vf30
Keywords
5G

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3GPP TS 24.526 version 15.3.0 Release 15 2 ETSI TS 124 526 V15.3.0 (2019-07)
Intellectual Property Rights
Essential patents
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pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
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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
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Modal verbs terminology
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"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
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3GPP TS 24.526 version 15.3.0 Release 15 3 ETSI TS 124 526 V15.3.0 (2019-07)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 4
1 Scope . 5
2 References . 5
3 Definitions, symbols and abbreviations . 6
3.1 Definitions . 6
3.2 Abbreviations . 6
4 Descriptions of UE policies for 5GS . 6
4.1 Overview . 6
4.2 UE route selection policy (URSP) . 7
4.2.1 General . 7
4.2.2 Association between an application and either a PDU session or non-seamless non-3GPP offload . 8
4.2.3 Unknown or unexpected URSP rules. 10
4.3 Access network discovery and selection policy (ANDSP) . 10
4.3.1 Overview . 10
4.3.2 WLAN selection policy (WLANSP) . 10
4.3.2.1 General . 10
4.3.2.2 WLAN access selection . 12
4.3.3 N3AN node configuration information . 12
4.3.3.1 General . 12
4.3.3.2 N3AN node selection . 12
4.4 Interworking with EPC . 12
5 Encoding of UE policies. 13
5.1 Overview . 13
5.2 Encoding of UE policy part type URSP . 13
5.3 Encoding of UE policy part type ANDSP . 19
5.3.1 General . 19
5.3.2 Encoding of WLANSP . 20
5.3.3 Encoding of N3AN node configuration information . 35
5.3.3.1 General . 35
5.3.3.2 N3AN node selection information . 36
5.3.3.3 Home N3IWF identifier configuration . 37
5.3.3.4 Home ePDG identifier configuration . 38
Annex A (informative): Change history . 41
History . 42

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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.
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3GPP TS 24.526 version 15.3.0 Release 15 5 ETSI TS 124 526 V15.3.0 (2019-07)
1 Scope
The present document defines UE policies for 5G System (5GS) as specified in 3GPP TS 23.503 [2] including:
- UE route selection policy; and
- Access network discovery and selection policy.
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 23.503: " Policy and Charging Control Framework for the 5G System; Stage 2".
[3] 3GPP TS 24.502: "Access to the 3GPP 5G Core Network (5GCN) via Non-3GPP Access
Networks (N3AN); Stage 3".
[4] 3GPP TS 23.003: "Numbering, addressing and identification".
[5] 3GPP TS 25.331: "Radio Resource Control (RRC); Protocol Specification".
[6] 3GPP TS 36.331: "Evolved Universal Terrestrial Radio Access (E-UTRA) Radio Resource
Control (RRC); Protocol specification".
[7] 3GPP TS 23.032: "Universal Geographical Area Description (GAD)".
[8] IEEE Std 802.11™-2012: "Information Technology- Telecommunications and information
exchange between systems-Local and metropolitan area networks-Specific requirements-Part 11:
Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications".
[9] Wi-Fi Alliance: "Hotspot 2.0 (Release 2) Technical Specification, version 1.0.0", 2014-08-08.
[10] ITU-T Recommendation E.212: "The international identification plan for public networks and
subscriptions", 2016-09-23.
[11] 3GPP TS 24.501: "Non-Access-Stratum (NAS) protocol for 5G System (5GS); Stage 3".
[12] IETF RFC 1035: "Domain names - implementation and specification".
[13] ISO 8601:2004: "Data elements and interchange formats -- Information interchange --
Representation of dates and times".
[14] 3GPP TS 38.413: "NG-RAN; NG Application Protocol (NGAP)".
[15] 3GPP TS 23.501: "System Architecture for the 5G System; Stage 2".
[16] IETF RFC 4122: "A Universally Unique IDentifier (UUID) URN Namespace".
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3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of the present document, the terms and definitions given in 3GPP TR 21.905 [1]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 following terms and definitions given in 3GPP TS 23.501 [15] apply:
non-seamless non-3GPP offload
For the purposes of the present document, the following terms and definitions given in 3GPP TS 23.503 [2] apply:
UE local configuration
For the purposes of the present document, the following terms and definitions given in 3GPP TS 24.501 [11] apply:
5GMM-IDLE mode
3.2 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].
5GCN 5G Core Network
5GS 5G System
ANDSP Access Network Discovery and Selection Policy
DNN Data Network Name
ePDG evolved Packet Data Gateway
FQDN Fully Qualified Domain Name
H-PCF A PCF in the HPLMN
IMS IP Multimedia Subsystem
LADN Local Area Data Network
MCC Mobile Country Code
ME Mobile Equipment
MMS Multimedia Messaging Service
MNC Mobile Network Code
N3AN Non-3GPP Access Network
N3IWF Non-3GPP InterWorking Function
OS Operating System
PCF Policy Control Function
S-NSSAI Single Network Slice Selection Assistance Information
SSC Session and Service Continuity
SUPI Subscriber Permanent Identifier
SUPL Secure User Plane Location
URSP UE Route Selection Policy
USIM User Services Identity Module
V-PCF A PCF in the VPLMN
WLANSP WLAN Selection Policy
4 Descriptions of UE policies for 5GS
4.1 Overview
The UE policies for 5GS include:
- UE route selection policy(URSP)(see subclause 4.2); and
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- Access network discovery and selection policy(ANDSP)(see subclause 4.3).
The UE policies can be delivered from the PCF to the UE. The UE policy delivery procedure is specified in
3GPP TS 24.501 [11].
The UE policies can also be pre-configured in the UE. The pre-configured policy shall be applied by the UE only when
the UE has not received the same type of policy from the PCF. The implementation of pre-configured UE policies is out
of scope of this specification.
4.2 UE route selection policy (URSP)
4.2.1 General
The URSP is defined in 3GPP TS 23.503 [2] and is a set of one or more URSP rules, where a URSP rule is composed
of:
a) a precedence value of the URSP rule identifying the precedence of the URSP rule among all the existing URSP
rules;
b) a traffic descriptor, including either:
1) match-all traffic descriptor; or
2) at least one of the following components:
A) one or more application identifiers;
B) one or more IP 3 tuples as defined in 3GPP TS 23.503 [2] i.e. the destination IP address, the destination
port number, and the protocol in use above the IP;
C) one or more non-IP descriptors, i.e. destination information of non-IP traffic;
D) one or more DNNs;
E) one or more connection capabilities; and
F) one or more domain descriptors, i.e. destination FQDN(s); and
c) one or more route selection descriptors each consisting of a precedence value of the route selection descriptor
and either
1) at least one of the followings:
A) SSC mode;
B) one or more S-NSSAIs;
C) one or more DNNs;
D) PDU session type; and
E) preferred access type; or
2) non-seamless non-3GPP offload indication.
Only one URSP rule in the URSP can be a default URSP rule and the default URSP rule shall contain a match all traffic
descriptor. If a default URSP rule and one or more non-default URSP rules are included in the URSP, any non-default
URSP rule shall have lower precedence value than (i.e. shall be prioritised over) the default URSP rule.
If a traffic descriptor lists one or more application identifiers together with one or more connection capabilities, the UE
shall consider that the application identifiers identify the applications requesting access to the connection capabilities.
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NOTE 1: The connection capabilities requested by the applications are OS dependent. The connection capability
identifiers defined in table 5.2.1 are OS independent. It is based on the UE implementation how the UE
matches the connection capabilities requested by the applications to the connection capability identifiers
in table 5.2.1.
NOTE 2: If the UE has multiple concurrently active OS, the traffic descriptor can list as many multiple OS Ids.
If one or more DNNs are included in the traffic descriptor of a URSP rule, the route selection descriptor of the URSP
rule shall not include any DNN.
NOTE 3: It is recommended to avoid the combination of more than two components in the traffic descriptor.
4.2.2 Association between an application and either a PDU session or
non-seamless non-3GPP offload
When the upper layers request information of the PDU session via which to send a PDU of an application, information
on the non-3GPP access outside of a PDU session shall be provided to the upper layers, without evaluating the URSP
rules, if due to UE local configuration non-seamless non-3GPP offload is requested. Otherwise, the UE shall proceed in
the following order:
a) the UE shall evaluate the URSP rules, except the default URSP rule, with a traffic descriptor matching the
application information in increasing order of their precedence values, if any. If the traffic descriptor contains
more than one component, all of them shall be matched.
If the UE finds the traffic descriptor in a non-default URSP rule matching the application information, and:
I) if there is one or more PDU sessions:
1) matching at least one of the route selection descriptors of the URSP rule; and
2) established without requesting any parameter not included in the matching route selection descriptor of
the URSP rule,
the UE shall provide information on the PDU session that matches the route selection descriptor of the lowest
precedence value to the upper layers;
NOTE 1: It is up to the UE implementation which PDU session to select if there exist multiple PDU sessions
matching the same route selection descriptor of the lowest precedence value.
II) otherwise:
1) the UE shall select a route selection descriptor with the next smallest precedence value which has not yet
been evaluated;
2) if:
i) the selected route selection descriptor contains a non-seamless non-3GPP offload indication:
A) if the information on the non-3GPP access outside of a PDU session is available, it shall be
provided to the upper layers and the UE shall stop selecting a route selection descriptor matching
the application information.
B) if the information about the non-3GPP access outside of a PDU session is not available, or non-
3GPP access is not available the UE shall proceed to step 4); or
ii) the selected route selection descriptor does not contain a non-seamless non-3GPP offload indication,
the URSP handling layer requests the UE NAS layer to establish a PDU session providing at least one
of the following PDU session attributes:
A) SSC mode if there is a SSC mode in the route selection descriptor;
NOTE 2: The SSC mode 3 is only used when the PDU session type is IPv4, IPv6 or IPv4v6.
B) one S-NSSAI if the S-NSSAI is in the route selection descriptor; and the S-NSSAI is in the
allowed NSSAI
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Otherwise, the S-NSSAI shall not be used as a PDU session attribute for establishing a PDU
session;
NOTE 3: If there are multiple S-NSSAIs in the route selection descriptor, an S-NSSAI is chosen among the S-
NSSAIs based on UE implementation.
C) one DNN, if the DNN in the route selection descriptor; and if the DNN is an LADN DNN and the
UE is in the service area of that LADN;
NOTE 4: If one or more DNNs are included in the traffic descriptor of a URSP rule, the existing DNNs in the route
selection descriptor for the application are ignored.
NOTE 5: If there is no DNN in the traffic descriptor and there are multiple DNNs in the route selection descriptor,
a DNN is chosen based on UE implementation.
D) PDU session type if the PDU session type is in the route selection descriptor; and
E) preferred access type if the preferred access type is in the route selection descriptor.
The UE NAS layer indicates the result of the PDU session establishment. Upon successful completion
of the PDU session establishment, the UE NAS layer shall additionally indicate the attributes of the
established PDU session (e.g. PDU session identity, SSC mode, S-NSSAI, DNN, PDU session type,
access type, PDU address) to the URSP handling layer, and shall provide information (e.g. PDU
address) of the successfully established PDU session to the upper layers. The UE shall stop selecting a
route selection descriptor matching the application information. If the PDU session establishment is
unsuccessful, the UE shall proceed to step 3);
3) Based on the rejection cause and if there is another value which can be used for the rejected component in
the same route selection descriptor, the UE shall select another combination of values in the currently
selected route selection descriptor by using this value of the rejected component and proceed to step 2),
otherwise the UE shall proceed to step 4); and
4) if there is any route selection descriptor which has not yet been evaluated, the UE shall proceed to step 1).
If all route selection descriptors for the matching non-default URSP rule have been evaluated and there is
one or more non-default matching URSP rule which has not yet been evaluated, the UE shall proceed to
step a). If all non-default matching URSP rules have been evaluated, the UE shall inform the upper layers
of the failure.
b) if no non-default matching URSP rule can be found and if UE local configuration for the application is available,
the UE shall perform the association of the application to a PDU session accordingly. If no matching PDU
session exists, the UE NAS layer shall attempt to establish a PDU session using UE local configuration.
NOTE 6: Any missing information in the UE local configuration needed to build the PDU session establishment
request can be the appropriate corresponding component from the default URSP rule with the "match-all"
traffic descriptor.
If the PDU session establishment is successful, the UE NAS layer shall provide information (e.g. PDU address)
of the successfully established PDU session to the upper layers. Otherwise, the UE shall go to step c);
c) if no non-default matching URSP rule can be found and if either UE local configuration for the application is not
available or the PDU session establishment based on UE local configuration for the application was
unsuccessful, the UE shall perform the association of the application to a PDU session or to non-seamless non-
3GPP offload according to the default URSP rule with the "match-all" traffic descriptor, if any. If the association
is unsuccessful, the UE shall inform the upper layers of the failure.
The HPLMN may pre-configure the UE with URSP or may provide URSP to the UE by signallingas described in
annex D of 3GPP TS 24.501 [11]. The pre-configured URSP and the signalled URSP shall be stored in a non-volatile
memory in the ME together with the SUPI from the USIM. If the UE has both pre-configured URSP and signalled
URSP, the UE shall only use the signalled URSP. The pre-configured URSP shall be stored until a new URSP is
configured by HPLMN or the USIM is removed. The signalled URSP may be modified by the procedures defined in
annex D of 3GPP TS 24.501 [11] and shall be stored until USIM is removed. The URSP can only be used if the SUPI
from the USIM matches the SUPI stored in the non-volatile memory of the ME. If the SUPI from the USIM does not
match the SUPI stored in the non-volatile memory of the ME, the UE shall delete the URSP.
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The UE may re-evaluate the URSP rules, to check if the change of the association of an application to a PDU session is
needed, when:
NOTE 7: The time when the UE performs the re-evaluation is up to UE implementation. It is recommended that the
UE performs the re-evaluation in a timely manner.
a) the UE performs periodic URSP rules re-evaluation based on UE implementation;
b) the UE NAS layer indicates that an existing PDU session used for routing traffic of an application based on a
URSP rule is released;
c) the URSP is updated by the PCF;
d) the UE NAS layer indicates that the UE performs inter-system change from S1 mode to N1 mode;
e) the UE NAS layer indicates that the UE is successfully registered in N1 mode over 3GPP access or non-3GPP
access;
f) the UE establishes or releases a connection to a WLAN access and transmission of a PDU of the application via
non-3GPP access outside of a PDU session becomes available/unavailable;
g) the allowed NSSAI is changed; or
h) the LADN information is changed.
If the re-evaluation leads to a change of the association of an application to a PDU session, the UE may enforce such
change immediately or when UE returns to 5GMM-IDLE mode.
NOTE 8: The time when the UE enforces the change of the association of an application to a PDU Session is up to
UE implementation. It is recommended that the UE performs the enforcement in a timely manner.
The URSP handling layer may request the UE NAS layer to release an existing PDU session after the re-evaluation.
4.2.3 Unknown or unexpected URSP rules
If the network provides URSP rules including any new component in the traffic descriptor or in the route selection
descriptor which is not recognized by the UE, such URSP rules are unknown or unexpected to the UE. In this case, the
UE shall ignore the unknown or unexpected URSP rules when evaluating the URSP rules to associate an application
either with a PDU session or with non-seamless non-3GPP offload.
4.3 Access network discovery and selection policy (ANDSP)
4.3.1 Overview
The ANDSP is used to control UE behaviour related to access network discovery and selection over non-3GPP access
network.
ANDSP consists of:
- WLAN Selection Policy (WLANSP) which is described in subclause 4.3.2.; and
- non-3GPP access network (N3AN) node configuration information which is described in subclause 4.3.3.
4.3.2 WLAN selection policy (WLANSP)
4.3.2.1 General
The WLANSP is used to control UE behaviour related to selection and reselection of a WLAN.
The WLANSP consists of zero or more WLANSP rules.
Each WLANSP rule consists of:
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- rule identifier;
- one or more groups of WLAN selection criteria;
- validity area;
- zero or more time of day;
- rule priority;
- roaming.
Each group of WLAN selection criteria contains:
- criteria priority;
- home network indication;
- preferred roaming partner list;
- min backhaul threshold;
- maximum BSS load value;
-
...