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TECHNICAL SPECIFICATION
5G;
User Equipment (UE) policies for 5G System (5GS);
Stage 3
(3GPP TS 24.526 version 15.0.0 Release 15)
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3GPP TS 24.526 version 15.0.0 Release 15 1 ETSI TS 124 526 V15.0.0 (2018-09)
Reference
DTS/TSGC-0124526vf00
Keywords
5G
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3GPP TS 24.526 version 15.0.0 Release 15 2 ETSI TS 124 526 V15.0.0 (2018-09)
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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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.
ETSI
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3GPP TS 24.526 version 15.0.0 Release 15 3 ETSI TS 124 526 V15.0.0 (2018-09)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 5
1 Scope . 6
2 References . 6
3 Definitions, symbols and abbreviations . 6
3.1 Definitions . 6
3.2 Abbreviations . 7
4 Descriptions of UE policies for 5GS . 7
4.1 Overview . 7
4.2 URSP . 7
4.2.1 General . 7
4.2.2 Association between an application and a PDU session . 8
4.3 ANDSP . 10
4.3.1 Overview . 10
4.3.2 WLAN selection policy . 10
4.3.2.1 General . 10
4.3.2.2 WLAN access selection . 11
4.3.3 N3AN node configuration information . 11
4.3.3.1 General . 11
4.3.3.2 N3AN node selection . 11
4.4 Interworking with EPC . 11
5 Coding of UE policies . 12
5.1 Overview . 12
5.2 URSP definition . 12
5.3 ANDSP definition . 18
5.3.1 General . 18
5.3.2 ANDSP definition . 18
5.3.2.1 WLANSP definition . 19
5.3.2.2 N3AN node configuration information definition . 28
5.3.2.2.1 General . 28
5.3.2.2.2 N3AN node selection information . 29
5.3.2.2.3 Home N3IWF identifier configuration . 30
5.3.2.2.4 Home ePDG identifier configuration . 32
Annex A (informative): 5GS N3AN Access Network Discovery and Selection Policy (ANDSP) . 34
A.2 WLAN selection policy . 34
A.2.3 WLANSP information parameters . 34
A.2.3.1 WLANSP . 34
A.2.3.2 WLANSP/ . 34
A.2.3.3 WLANSP//RulePriority . 34
A.2.3.4 WLANSP//SelectionCriteria . 34
A.2.3.5 WLANSP//SelectionCriteria/ . 34
A.2.3.6 WLANSP//SelectionCriteria//CriteriaPriority . 35
A.2.3.7 WLANSP//SelectionCriteria//HomeNetworkIndication. 35
A.2.3.8 WLANSP//SelectionCriteria//PreferredRoamingPartnerList . 35
A.2.3.9 WLANSP//SelectionCriteria//MinBackhaulThreshold . 35
A.2.3.10 WLANSP//SelectionCriteria//MaximumBSSLoadValue . 36
A.2.3.11 WLANSP//SelectionCriteria//RequiredProtoPortTuple . 36
A.2.3.12 WLANSP//SelectionCriteria//SPExclusionList . 36
A.2.3.13 WLANSP//SelectionCriteria//PreferredSSIDList . 36
A.2.3.14 WLANSP//SelectionCriteria//PreferredSSIDList/ . 37
A.2.3.15 WLANSP//SelectionCriteria//PreferredSSIDList/WLANPriority . 37
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A.2.3.16 WLANSP//SelectionCriteria//PreferredSSIDList//SSID . 37
A.2.3.17 WLANSP//SelectionCriteria//PreferredSSIDList//HESSID . 37
Annex B (informative): Change history . 38
History . 39
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3GPP TS 24.526 version 15.0.0 Release 15 5 ETSI TS 124 526 V15.0.0 (2018-09)
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 15.0.0 Release 15 6 ETSI TS 124 526 V15.0.0 (2018-09)
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 & 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 mobile terminals and
mobile users".
[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".
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] 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].
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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 & Selection Policy
DNN Data Network Name
ePDG evolved Packet Data Gateway
FQDN Fully Qualified Domain Name
MCC Mobile Country Code
MNC Mobile Network Code
N3AN Non-3GPP Access Network
N3IWF Non-3GPP InterWorking Function
PCF Policy Control Function
S-NSSAI Single Network Slice Selection Assistance Information
SSC Session and Service Continuity
URSP UE Route Selection Policy
WLANSP WLAN Selection Policy
4 Descriptions of UE policies for 5GS
4.1 Overview
The UE policies for 5GS include:
- UE route selection policy (see subclause 4.2); and
- Access network discovery & selection policy (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 URSP
4.2.1 General
The URSP defined in 3GPP TS 23.503 [2] is a set of one or more URSP rules, where a URSP rule is composed of:
a) a precedence value of the URSP rule;
b) a traffic descriptor, including either:
1) match all traffic descriptor; or
2) at least one of the followings:
A) application identifier(s);
B) IP 3 tuple(s) as defined in 3GPP TS 23.503 [2];
C) non-IP descriptor(s); and
D) DNN(s); and
c) one or more route selection descriptors each consisting of a precedence value of the route selection descriptor
and either
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1) at least one of the followings:
A) SSC mode;
B) S-NSSAI(s);
C) DNN(s);
D) PDU session type; and
E) preferred access type; or
2) non-seamless non-3GPP offload indication.
Only one URSP rule in 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 URSP, any non-default
URSP rule shall have lower precedence value than (i.e. shall be prioritised over) the default URSP rule.
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.
4.2.2 Association between an application and a PDU session
When the upper layers request information of the PDU session via which to send a PDU of an application, the UE shall
evaluate all URSP rules that are available in the UE in increasing order of their precedence values by matching the
application information with the traffic descriptor in the URSP rules. If the UE finds the traffic descriptor in a URSP
rule matching the application information and:
a) if there exists a PDU session matching one of the route selection descriptors of the URSP rule, the UE shall
provide information on the PDU session to the upper layers; or
b) otherwise:
1) the UE shall search a route selection descriptor with the next smallest precedence value which has not yet
been evaluated;
2) if the searched route selection descriptor:
i) contains a non-seamless non-3GPP offload indication, information on the non-3GPP access outside of a
PDU session shall be provided to the upper layers, if available, and the UE shall stop searching a route
selection descriptor matching the application information. If information about the non-3GPP access is
not available, or non-3GPP access is not available the UE shall proceed to step 3); or
ii) 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 the following PDU session attributes:
A) SSC mode in the route selection descriptor, if any, or otherwise SSC mode in the user preference for
the application, if any SSC mode is included in the user preference for the application;
B) one S-NSSAI, if applicable, with the following conditions:
- the S-NSSAI is in the route selection descriptor; and
- the S-NSSAI is in the allowed NSSAI
Otherwise, the S-NSSAI shall not be used as a PDU session attribute for establishing a PDU session;
NOTE 1: 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, with the following conditions:
- the DNN is in the user preference for the application, if any, or otherwise in the route selection
descriptor, if any; and
- if the DNN is an LADN DNN, the UE is in the service area of this LADN;
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NOTE 2: If one or more DNNs are included in the traffic descriptor of a URSP rule, the DNNs in the user
preference (if any) and in the route selection descriptor (if any) for the application need to be ignored.
NOTE 3: If there is no DNN in either the traffic descriptor or the user preference and there are multiple DNNs in
the route selection descriptor, a DNN is chosen based on UE implementation.
D) PDU session type in the user preference for the application, if any, or otherwise PDU session type in
the route selection descriptor, if any PDU session type is included in the route selection descriptor;
and
E) preferred access type in the user preference for the application, if any, or otherwise preferred access
type in the route selection descriptor, if any preferred access type is included 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 provide information (e.g. PDU address) of the
successfully established PDU session to the upper layers. The UE shall stop searching a route selection
descriptor matching the application information. If the PDU session establishment is unsuccessful, the UE
shall proceed to step 3); and
3) the UE shall proceed to step 1) if there is any route selection descriptor which has not yet been evaluated;
otherwise, information on a PDU session shall not be provided to the upper layers and the UE shall stop
searching a route selection descriptor matching the application information.
The HPLMN may pre-configure the UE with URSP or provide URSP to the UE by signalling (see annex D of
3GPP TS 24.501 [11]). If available, 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 only. 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; else the UE shall delete it.
The UE may re-evaluate the URSP rules and change the association of an application to a PDU session when:
NOTE 4: 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.
The URSP handling layer may request the UE NAS layer to release an existing PDU session after the re-evaluation.
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4.3 ANDSP
4.3.1 Overview
The Access Network Discovery & Selection policy (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); and
- Non-3GPP access network (N3AN) node configuration information.
WLAN Selection Policy (WLANSP) is further described in subclause 4.3.2.
Non-3GPP access network (N3AN) node configuration information is described in subclause 4.3.3.
4.3.2 WLAN selection policy
4.3.2.1 General
WLAN Selection Policy (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:
- one or more WLAN selection criteria;
- validityArea;
- zero or more TimeOfDay;
- rule priority;
- roaming; and
- PLMN identity.
Each selection criterion contains:
- CriteriaPriority;
- HomeNetworkIndication;
- PreferredRoamingPartnerList;
- MinBackhaulThreshold;
- MaximumBSSLoadValue;
- RequiredProtoPortTuple;
- SPExclusionList; and
- PreferredSSIDList.
The priority of a selection criterion is encoded in the CriteriaPriority field. The WLAN priority defined in the
PreferredSSIDList represents the priority of the WLAN matching the selection criterion.
The validity of the WLANSP rule can be restricted by validity conditions. The validity of the WLANSP rule takes into
account ValidityArea, Roaming, and TimeOfDay where each condition must match in order to make the WLANSP rule
valid.
Each ValidityArea consists of:
- 3GPP location;
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- WLAN location; and
- Geo-location.
Each TimeOfDay consists of:
- TimeStart;
- TimeStop;
- DateStart;
- DateStop; and
- DayOfWeek.
The WLANSP rule is considered valid if none of the validity conditions exist or all validity conditions match.
There can be multiple valid WLANSP rules at the same time. In addition to validity conditions and selection criteria,
there is a rule priority that shall be set for each WLANSP rule. The rule priority is encoded in the RulePriority field, and
it enables the UE to determine which WLANSP rule, out of potentially several valid WLANSP rules, it should consider
as active. A WLANSP rule is active if it is valid and has highest rule priority out of the valid WLANSP rules. At any
point in time, there shall be at most one active WLANSP rule. A WLAN that matches a selection criterion of the active
WLANSP rule is considered as matching the selection criterion.
If the UE is roaming and WLANSP rules from both HPLMN and VPLMN are available, visited WLANSP rules takes
precedence.
4.3.2.2 WLAN access selection
The procedure of UE selecting WLAN access network based on WLAN selection policy is specified in
3GPP TS 24.502 [3].
4.3.3 N3AN node configuration information
4.3.3.1 General
Non-3GPP access network (N3AN) node configuration information is used to control UE behaviour related to selection
of either N3IWF or ePDG for accessing 5GCN via non-3GPP access.
The non-3GPP access network (N3AN) node configuration information consists of:
- Non-3GPP access network (N3AN) node selection information;
- optionally, home ePDG identifier configuration; and
- optionally, home N3IWF identifier configuration.
4.3.3.2 N3AN node selection
The procedure of UE selecting an N3AN node based on N3AN node configuration information is specified in
3GPP TS 24.502 [3].
4.4 Interworking with EPC
If the UE supports both S1 mode and N1 mode, the
...