3 Symbols and Abbreviations

12.713GPPLocation Services (LCS)Location services managementTS

3.1 Symbols

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

Lb Interface between Serving MLC and BSC (BSC interface)

Le Interface between External User and Gateway MLC (external interface)

Lg Interface between Gateway MLC and VMSC (Gateway MLC interface)

Lh Interface between Gateway MLC and HLR (HLR interface)

Lp Interface between SMLC and peer SMLC (peer interface)

Ls Interface between Serving MLC and VMSC (Serving MLC interface)

Um Air Interface to an LMU (measurement interface)

3.2 Abbreviations

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

ASN.1 (CCITT) Abstract Syntax Notation One

A-GPS Assisted Global Positioning System

BSC Base Station Controller

BSS Base Station Subsystem

BTS Base Transceiver Station

CCCH Common Control Channel

CMIP Common Management Information Protocol

DTAP Direct Transfer Application Part

E-OTD Enhanced Observed Time Difference

GMLC Gateway MLC

GPS Global Positioning System

GSM Global System for Mobile communications

HLR Home Location Register

HW Hardware

ID Identifier

IMSI International Mobile Subscriber Identity

LCS LoCation Service

LLP LMU LCS Protocol

LMU Location Measurement Unit

MLC Mobile Location Centre

MMI Man‑Machine Interface

MS Mobile Station

MSC Mobile‑services Switching Centre

NE Network Element

NM Network Management

NSS Network and Switching Subsystem

O&M Operations and Maintenance

OSS Operations Subsystem

PLMN Public Land Mobile Network

RIT Radio Interface Timing

SDCCH Stand-alone Dedicated Control CHannel

SMLC Serving Mobile Location Centre

SW Software

TMN Telecommunications Management Network

TOA Time of Arrival

TCH Traffic CHannel

VLR Visitor Location Register

VMSC Visited MSC

Further GSM related abbreviations may be found in GSM 01.04 (ETR 100) [1].