3 Definitions and abbreviations

29.1713GPPLCS Application Protocol (LCS-AP) between the Mobile Management Entity (MME) and Evolved Serving Mobile Location Centre (E-SMLC)Location Services (LCS)Release 17SLs interfaceTS

3.1 Definitions

For the purposes of the present document, the terms and definitions given in 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 TR 21.905 [1].

Elementary Procedure: LCS-AP protocol consists of Elementary Procedures (EPs). An LCS-AP Elementary Procedure is a unit of interaction between the MME and the E-SMLC. An EP consists of an initiating message and possibly a response message. Two kinds of EPs are used:

– Class 1: Elementary Procedures with response (success or failure),

– Class 2: Elementary Procedures without response.

3.2 Abbreviations

For the purposes of the present document, the abbreviations given in 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 TR 21.905 [1].

CID Cell-ID (positioning method)

E-CID Enhanced Cell-ID (positioning method)

E-SMLC Enhanced Serving Mobile Location Centre

E-UTRAN Envolved Universal Terrestrial Radio Access Network

GNSS Global Navigation Satellite System

GPS Global Positioning System

LCS LoCation Services

LCS-AP LCS Application Protocol

LPP LTE Positioning Protocol

LPPa LTE Positioning Protocol Annex

LTE Long Term Evolution

MBS Metropolitan Beacon System

MO-LR Mobile Originated Location Request

MT-LR Mobile Terminated Location Request

NI-LR Network Induced Location Request

MME Mobility Management Entity

OTDOA Observed Time Difference Of Arrival

PDU Protocol Data Unit

SCTP Stream Control Transmission Protocol

SET SUPL Enabled Terminal

SLP SUPL Location Platform

SUPL Secure User Plane Location

TA Timing Advanced

UE User Equipment

U-TDOA Uplink Time Difference Of Arrival