3 Definitions, symbols and abbreviations

23.1673GPPIP Multimedia Subsystem (IMS) emergency sessionsRelease 17TS

3.1 Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 [11] and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905 [11].

Charging Data Record: Record generated by a network element for the purpose of billing a subscriber for the provided service. See TS 32.260 [35] for further details.

Connectivity Session Location and Repository Function (CLF): As per ETSI ES 282 004 [18], the Connectivity Session Location and Repository Function (CLF) registers the association between the IP address allocated to the UE and related network location information, i.e.: access transport equipment characteristics, line identifier (Logical Access ID), IP Edge identity.

NG-eCall (eCall Over IMS): A manually or automatically initiated IMS emergency call, from a vehicle, supplemented with a minimum set of emergency related initial data (MSD).

Emergency Call Server (ECS): The functional entity consists of a Location Retrieval Function (LRF) and either a routing proxy or a redirect server, e.g. an ECS contains a VPC and a Routing Proxy or Redirect Server in NENA I2 architecture [17].

Emergency‑CSCF: The Emergency‑CSCF handles certain aspects of emergency sessions, e.g. routing of emergency requests to the correct emergency centre or PSAP.

Emergency Service Query Key (ESQK): A 10-digit North American Numbering Plan number used to identify a particular emergency call instance. It is used by the LRF as a key to look up for the location information and callback information associated with the emergency call instance and is also used by the PSAP to query location information from the LRF.

Emergency Service Routing Key (ESRK): see TS 23.271 [5] or J‑STD‑036 [23].

Emergency Service Routing Number (ESRN): North American Numbering Plan number used for routing of an emergency call to the appropriate gateway for an eventual delivery towards a CS-based PSAP.

Geographical Location Information: Location indicated in geographical terms, for example geographical coordinates or street address (e.g. as supported by IETF RFC 4119 [14]).

Local regulation: Condition defined by the authority whose legislation applies where the emergency service is invoked.

Location Identifier: Information about the current location of the UE in the network. Location is indicated in network terms, for example using the global cell id in cellular networks, line-id in fixed broadband networks, (OMA-Location also uses this term, but OMA so far defines the Location Identifier only for cellular access.)

Location Information: The location information may consist of the Location Identifier, and/or the Geographical location information.

Location Retrieval Function (LRF): This functional entity handles the retrieval of location information for the UE including, where required, interim location information, initial location information and updated location information. The LRF may interact with a separate RDF or contain an integrated RDF in order to obtain routing information. The LRF may interact with a separate Location Server or contain an integrated Location Server in order to obtain location information. The LRF may interact with or contain other types of location server functions in order to obtain location information.

Location Server (LS): General term for the entity responsible for obtaining the location of the UE (e.g. GMLC see TS 23.271 [5], MPC see 3GPP2 X.S0002 [24] or SLP see OMA AD SUPL [15]).

Last Routing Option (LRO): A number, which may be used in the event of network failure towards a specific location based PSAP or a number that can be associated to a national or default PSAP/Emergency centre.

Operator policy: Condition set by operator.

Private Numbering Plan: According to ETSI TS 181 019 [36], a numbering plan explicitly relating to a particular private numbering domain.

Public Safety Answering Point (PSAP): A physical location, where emergency calls from the public are received.

Routing Determination Function (RDF): The functional entity, which may be integrated in a Location Server or in an LRF, provides the proper PSAP destination address to the E‑CSCF for routing the emergency request. It can interact with a LS to manage ESQK allocation and management, and deliver location information to the PSAP.

Stand-alone Non-Public Network: A non-public network not relying on network functions provided by a PLMN.

For the purposes of the present document, the following terms and definitions given in TS 24.229 [19] apply:

Private Network Traffic

NOTE: All traffic from UEs having registered a contact bound to a public user identity receiving hosted enterprise services, is private network traffic.

Public Network Traffic

For the purposes of the present document, the following terms and definitions given in TS 23.401 [28] apply:

eCall Only Mode: See TS 23.401 [28].

For the purposes of the present document, the following terms and definitions given in TS 22.101 [8] apply:

eCall: See TS 22.101 [8].

Minimum Set of Data (MSD): See TS 22.101 [8].

3.2 Abbreviations

For the purposes of the present document, the following abbreviations apply:

CDR Charging Data Record

CLF Connectivity session Location and repository Function

CS Circuit Switched

DRVCC Dual Radio Voice Call Continuity

E‑CSCF Emergency‑CSCF

EATF Emergency Access Transfer Function

ECS Emergency Call Server

ESQK Emergency Service Query Key

ESRK Emergency Service Routing Key

ESRN Emergency Service Routing Number

HRPD High Rate Packet Data

LRF Location Retrieval Function

LRO Last Routing Option

LS Location Server

MPC Mobile Positioning Centre

MSD Minimum Set of emergency related Data

PDS Packet Data Subsystem

PSAP Public Safety Answering Point

RDF Routing Determination Function

SET SUPL Enabled Terminal

SLP SUPL Location Platform

SNPN Standalone Non-Public Network

SRVCC Single Radio Voice Call Continuity

SUPL Secure User Plane for Location

URN Uniform Resource Name

VPC VoIP Positioning Centre

WLAN Wireless LAN