3 Definitions, symbols and abbreviations

24.3023GPPAccess to the 3GPP Evolved Packet Core (EPC) via non-3GPP access networksRelease 17Stage 3TS

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].

Access Network Discovery and Selection Function: In this specification, Access Network Discovery and Selection Function (ANDSF) is a network element specified in 3GPP TS 23.402 [6]. Unless otherwise specified, the term ANDSF is used to refer to both Home and Visited ANDSF.

ANDSF rules: In this specification, ANDSF rules refers to the set of ANDSF policies defined in 3GPP TS 24.312 [13] for WLAN access selection and traffic routing between E-UTRAN or UTRAN and WLAN. ANDSF rules can contain RAN validity conditions for RAN-assisted WLAN interworking.

Emergency session: In this specification, an emergency session refers to an emergency PDN connection established in E-UTRAN and handed over to a S2a based cdma2000® HRPD access network, or an emergency PDN connection established over trusted or untrusted WLAN access, or an emergency PDN connection established in 3GPP access and handed over to trusted or untrusted WLAN access.

Equivalent home service provider: In this specification, equivalent home service provider is a service provider that is equivalent to HPLMN in regard to service provider selection over WLAN.

Equivalent visited service provider: In this specification, equivalent visited service provider is a service provider that is equivalent to the V-PLMN in regard to service provider selection over WLAN.

Home ANDSF: In this specification, the Home ANDSF (H-ANDSF) is an ANDSF element located in the home PLMN of a UE.

Offload Preference Indicator (OPI): In this specification, Offload Preference Indicator (OPI) is a bitmap (i.e. a one-dimensional bit array) that can be used by UEs in an E-UTRA or UTRA cell to determine when to move certain traffic (e.g. certain IP flows) to WLAN access or to 3GPP access. The meaning of each bit in this bitmap is operator specific and is not defined in 3GPP specifications.

Offloadable PDN connection: In this specification, an offloadable PDN connection is a PDN connection, established in (or previously handed over to) 3GPP access, such that:

– the WLAN offload indication information element (see 3GPP TS 24.301 [10] and 3GPP TS 24.008 [46]) last received for the PDN connection has the "offloading the traffic of the PDN connection via a WLAN when in S1 mode is acceptable" value and the UE is in S1 mode; or

– the WLAN offload indication information element (see 3GPP TS 24.301 [10] and 3GPP TS 24.008 [46]) last received for the PDN connection has the "offloading the traffic of the PDN connection via a WLAN when in UTRAN Iu mode is acceptable" value and the UE is in UTRAN Iu mode.

Preferred Service Providers List (PSPL): In this specification, the Preferred Service Providers List refers to a prioritized list of service provider realms other than equivalent home service providers preferred by the UE’s 3GPP home operator for WLAN.

Set of Access network discovery information: In this specification, a set of Access network discovery information is the access network discovery information from a single ANDSF.

Set of Inter-system mobility policy: In this specification, a set of Inter-system mobility policy is the inter-system policy information received from a single ANDSF.

Visited ANDSF: In this specification, the Visited ANDSF (V-ANDSF) is an ANDSF element located in the visited PLMN of a UE.

RAN Assistance Information: In this specification, RAN Assistance Information refers to the set of thresholds and parameters that can be provided by E-UTRAN or UTRAN to the UE for assisting WLAN access selection and traffic routing. The RAN assistance information can include 3GPP access thresholds, WLAN access thresholds, an Offload Preference Indicator (OPI) value and WLAN identifiers as defined in 3GPP TS 25.331 [14A] and 3GPP TS 36.331 [16B].

RAN rules: In this specification, RAN rules refers to the set of RAN assistance parameter and RAN steering command handling, access network selection and traffic steering procedures defined in 3GPP TS 36.304 [16], 3GPP TS 25.304 [14] and 3GPP TS 36.331 [16B] for the steering of traffic between E-UTRAN or UTRAN and WLAN associated with RAN-controlled LTE-WLAN interworking or RAN-assisted WLAN interworking.

Restrictive non-3GPP access network type I: a non-3GPP access network forwarding IP packets of TCP connections initiated by a served UE, with destination port 443, and with destination address outside of the non-3GPP access network, and discarding IP packets of some or all other TCP connections initiated by the served UE, with destination address outside of the non-3GPP access network.

Restrictive non-3GPP access network type II: a non-3GPP access network discarding IP packets of TCP connections initiated by a served UE, with destination address outside of the non-3GPP access network, where the non-3GPP access network contains HTTP proxy supporting HTTP CONNECT method for URIs with port 443 and with host outside of the non-3GPP access network.

Restrictive non-3GPP access network: restrictive non-3GPP access network type I or restrictive non-3GPP access network type II.

Firewall traversal tunnel (FTT): a TCP connection with TLS connection enabling passing of messages between UE in restrictive non-3GPP access network and ePDG.

Firewall traversal tunnel keep-alive time (FTT KAT): a maximum time between two subsequent messages sent by UE in the firewall traversal tunnel.

Unauthenticated IMSI: In this specification, the term "unauthenticated IMSI" or the term "IMSI is unauthenticated" is only pertinent to the network. The knowledge that a UE’s IMSI is unauthenticated or that the UE has an unauthenticated IMSI, is not available to the UE.

WLAN Selection Policy (WLANSP): In this specification, the WLAN Selection Policy is a set of operator-defined rules that determine how the UE selects/reselects a WLAN access network.

WLAN selection information: In this specification, WLAN selection information refers to the information received from ANDSF including WLAN Selection Policy (WLANSP), rule selection information, Home Network Preference information and Visited Network Preference information as specified in 3GPP TS 24.312 [13].

Visited PLMNs with preferred rules: In this specification, visited PLMNs with preferred rules included in the rule selection information refers to a list of identifiers of visited PLMNs provided by HPLMN, so that the UE roaming in such visited PLMN prefers ISMP, ISRP or WLANSP rules provided by the visited PLMN over ISMP, ISRP or WLANSP rules provided the HPLMN. In ANDSF MO, the visited PLMNs with preferred rules correspond to the ANDSF/RuleSelectionInformation/VPLMNswithPreferredRules interior node.

For the purposes of the present document, the following terms and definitions given in 3GPP TS 23.122 [4] apply:

Acceptable cell

EHPLMN

Home PLMN

Limited service state

RPLMN

Visited PLMN

For the purposes of the present document, the following terms and definitions given in 3GPP TS 23.402 [6] apply:

IFOM capable UE

Inter-APN routing capable UE

Local Operating Environment Information

MAPCON capable UE

S2a

S2b

S2c

Non-seamless WLAN offload capable UE

Single-connection mode (SCM)

Transparent single-connection mode (TSCM)

Multi-connection mode (MCM)

For the purposes of the present document, the following terms and definitions given in 3GPP TS 29.273 [17] apply:

STa

For the purposes of the present document, the following terms and definitions given in 3GPP TS 24.301 [10] apply:

Evolved packet core network

Evolved packet system

For the purposes of the present document, the following terms and definitions given in WiMAX Forum Network Architecture Release 1.0 version 1.2 – Stage 3 [25] apply:

Network Access Provider

Network Service Provider

For the purposes of the present document, the following terms and definitions given in 3GPP TS 33.402 [15] apply:

External AAA server

For the purposes of the present document, the following terms and definitions given in 3GPP TS 24.312 [13] apply:

Active rule

Valid rule

For the purposes of the present document, the following terms and definitions given in 3GPP TS 23.003 [3] that relate to access to 3GPP evolved packet core via non-3GPP access networks, apply:

NAI

Alternative NAI

Decorated NAI

Emergency NAI

Fast-Reauthentication NAI

Pseudonym Identity

Root NAI

For the purposes of the present document, the following terms and definitions given in 3GPP TS 23.002 [2A] apply:

3GPP AAA Proxy

3GPP AAA Server

For the purposes of the present document, the following terms and definitions given in 3GPP TS 23.161 [68] apply:

NBIFOM

Routing Rule

UE-inititaed NBIFOM

Network-initiated NBIFOM

Multi-access PDN connection

For the purposes of the present document, the following terms and definitions given in 3GPP TS 24.501 [76] apply:

N1 mode

PDU session ID

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].

AAA Authentication, Authorization and Accounting

ACL Access Control List

AKA Authentication and Key Agreement

ANDSF Access Network Discovery and Selection Function

ANDSF-SN Access Network Discovery and Selection Function Server Name

ANID Access Network Identity

ANQP Access Network Query Protocol

APN Access Point Name

DHCP Dynamic Host Configuration Protocol

DM Device Management

DNS Domain Name System

DSCP Differentiated Services Code Point

DSMIPv6 Dual-Stack MIPv6

eAN/PCF Evolved Access Network Packet Control Function

EAP Extensible Authentication Protocol

EPC Evolved Packet Core

ePDG Evolved Packet Data Gateway

EPS Evolved Packet System

ERP EAP Re-authentication Protocol

ESP Encapsulating Security Payload

FQDN Fully Qualified Domain Name

GAA Generic Authentication Architecture

GBA Generic Bootstrapping Architecture

HA Home Agent

H-ANDSF Home-ANDSF

HRPD High Rate Packet Data

HSGW HRPD Serving Gateway

IEEE Institute of Electrical and Electronics Engineers

IFOM IP Flow Mobility

IKEv2 Internet Key Exchange version 2

IARP Inter-APN Routing Policy

IPMS IP Mobility Mode Selection

ISMP Inter-system Mobility Policy

ISRP Inter-system Routing Policy

IANA Internet Assigned Numbers Authority

I-WLAN Interworking – WLAN

MAPCON Multi Access PDN Connectivity

MCM Multi-connection mode

MO Management Object

NAI Network Access Identifier

NAP Network Access Provider

NBIFOM Network-Based IP Flow Mobility

NBM Network based mobility management

NSP Network Service Provider

NSSAI Network Slice Selection Assistance Information

NSWO Non-Seamless WLAN Offload

OMA Open Mobile Alliance

OPI Offload Preference Indicator

PCO Protocol Configuration Options

P-GW PDN Gateway

PDU Protocol Data Unit

PSPL Preferred Service Provider List

QoS Quality of Service

SCM Single-connection mode

S-GW Serving Gateway

S-NSSAI Single NSSAI

SPI Security Parameters Index

TFT Traffic Flow Template

TSCM Transparent single-connection mode

UE User Equipment

UICC Universal Integrated Circuit Card

V-ANDSF Visited-ANDSF

W-APN WLAN APN

WiMAX Worldwide Interoperability for Microwave Access

WLAN Wireless Local Area Network

WLANSP WLAN Selection Policy

WLCP WLAN Control Protocol

WMF WiMAX Forum