03.713GPPFunctional descriptionLocation Services (LCS)Release 1999Stage 2TS

3.1 Definitions

For the purposes of the present document the following terms and definitions apply.

Location Estimate: the geographic location of an MS and/or a valid ME, expressed in latitude and longitude data. . The Location Estimate shall be represented in a well-defined universal format. Translation from this universal format to another geographic location system may be supported, although the details are considered outside the scope of the primitive services.

Mobile Assisted positioning: any mobile centric positioning method (e.g. E-OTD, GPS) in which the MS provides position measurements to the network for computation of a location estimate by the network. The network may provide assistance data to the MS to enable position measurements and/or improve measurement performance.

Mobile Based positioning: any mobile centric positioning method (e.g. E-OTD, GPS) in which the MS performs both position measurements and computation of a location estimate and where assistance data useful or essential to one or both of these functions is provided to the MS by the network. Position methods where an MS performs measurements and location computation without network assistance data are not considered within this category.

Mobile Originating Location Request (MO-LR): any location request from a client MS to the LCS Server made over the GSM air interface. While an MO-LR could be used to request the location of another MS, its primary purpose is to obtain an estimate of the client MS’s own location either for the client MS itself or for another LCS client designated by the MS.

Mobile Terminating Location Request (MT-LR): any location request from an LCS client where the client is treated as being external to the PLMN to which the location request is made.

Network Induced Location Request (NI-LR): any location request for a target MS from a client that can be considered to lie inside any of the PLMN entities currently serving the target MS. In this case, the LCS client is also within the LCS server. Examples of an NI-LR include a location request needed for supplementary services, for emergency call origination and by O&M in a visited PLMN.

North American Emergency Services Routing Digits (NA-ESRD): a telephone number in the North American Numbering Plan (NANP) that can be used to identify a North American emergency services provider and any associated LCS client. The ESRD shall also identify the base station , cell site or sector from which a North American emergency call originates.

North American Emergency Services Routing Key (NA-ESRK): a telephone number in the North American Numbering Plan (NANP) assigned to an emergency services call by a North American VPLMN for the duration of the call that can be used to identify (e.g. route to) both the emergency services provider and the switch in the VPLMN currently serving the emergency caller. During the lifetime of an emergency services call, the ESRK can also be used to identify the calling mobile subscriber.

3.2 Abbreviations

Certain abbreviations used in the present document are also listed in GSM 01.04.

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

ANM Answer Message (ISUP)

BSSAP-LE BSSAP LCS Extension for Lb, Lp and Ls interfaces

BSSLAP BSS LCS Assistance Protocol

BSSMAP-LE BSSMAP LCS Extension

CC SCCP Connection Confirm

CR SCCP Connection Request

CREF SCCP Connection Refused

DT1 SCCP Data Form 1 message

FEC Forward Error Correction

GPRS General Packet Radio Service

IAM Initial Address Message (ISUP)

LIR Location Immediate Request

LDR Location Deferred Request

LCF Location Client Function

LCAF Location Client Authorization Function

LCCF Location Client Control Function

LCZTF Location Client Zone Transformation Function

LLP LMU LCS Protocol

LMMF LMU Mobility Management Function

LMU Location Measurement Unit

LSCF Location System Control Function

LSAF Location Subscriber Authorization Function

LSPF Location Subscriber Privacy Function

LSBcF Location System Broadcast Function

LSBF Location System Billing Function

LSOF Location System Operations Function

LCCTF Location Client Coordinate Transformation Function

MO-LR Mobile Originating Location Request

MT-LR Mobile Terminating Location Request

NI-LR Network Induced Location Request

MLC Mobile Location Center

PRAF Positioning Radio Assistance Function

PRCF Positioning Radio Coordination Function

PCF Positioning Calculation Function

PSMF Positioning Signal Measurement Function

RA Rate Adaptation

REL Release (ISUP)

RLC Release Complete (ISUP or SCCP)

RLP Radio Link Protocol (GSM 04.22)

RLSD SCCP Released message

RRLP RR LCS Protocol to a target MS (defined in GSM 04.31)

SGSN Serving GPRS Support Node

SLPP Subscriber LCS Privacy Profile

SMLCPP SMLC Peer Protocol (messages on Lp interface in GSM 08.31)

TA Timing Advance (between an MS and its serving BTS)

TOA Time of Arrival

UDT SCCP Unitdata message

3.3 Symbols

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

Gb Interface between SGSN and BSS

Gs Interface between MSC and SGSN

Lb Interface between Serving MLC and BSC (BSC interface)

Lc Interface between gateway MLC and gsmSCF (CAMEL interface)

Le Interface between External User and MLC (external interface)

Lh Interface between Gateway MLC and HLR (HLR interface)

Lg Interface between Gateway MLC and VMSC (gateway MLC 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)