3 Definitions and abbreviations
3GPP43.059Functional stage 2 description of Location Services (LCS) in GERANRelease 17TS
3.1 Definitions
For the purposes of the present document the following terms and definitions apply and the terms and definitions given in 3GPP TS 22.101.
A/Gb mode: see 3GPP TS 43.051 [11].
Coverage Class: see 3GPP TS 43.064 [41].
EC-GSM-IoT: see 3GPP TS 43.064 [41].
EC operation: see 3GPP TS 43.064 [41].
Iu mode: see 3GPP TS 43.051 [11].
LCS (LoCation Services): LCS is a service concept in system standardisation. LCS specifies all the necessary network elements and entities, their functionality, interfaces, as well as communication messages, necessary to implement the positioning functionality in a cellular network.
NOTE 1: LCS does not specify any location based (value added) services except locating of emergency calls.
LCS Client: software and/or hardware entity that interacts with a LCS Server for the purpose of obtaining location information for one or more Mobile Stations. LCS Clients subscribe to LCS in order to obtain location information. LCS Clients may or may not interact with human users. The LCS Client is responsible for formatting and presenting data and managing the user interface (dialogue). The LCS Client may reside in the Mobile Station (MS).
LCS Server: software and/or hardware entity offering LCS capabilities. The LCS Server accepts requests, services requests, and sends back responses to the received requests. The LCS server consists of LCS components, which are distributed to one or more PLMN and/or service provider.
Location Estimate: geographic location of an MS and/or valid Mobile Equipment (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.
Location Request: request for a Location Estimate and optionally a Velocity Estimate.
Mobile Assisted positioning: any mobile centric positioning method (e.g. E-OTD, A-GNSS) 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, A-GNSS) 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 Station: consists of Mobile or User Equipment (ME or MS) with a valid SIM or USIM attached.
Positioning (/location detecting): positioning is a functionality, which detects a geographical location (of e.g. a mobile terminal).
Positioning technology (/locating technology): technology or system concept including the specifications of RF interfaces, data types, etc. to process the estimation of a geographical location, e.g. A-GNSS and E-OTD.
Radio Interface Timing: Comprise Absolute Time Differences (ATDs) or Real Time Differences (RTDs) of the signals transmitted by Base Stations, where timing differences are measured relative to either some absolute time difference (ATD) or the signals of another Base Station (RTD).
RRLP maximum PDU size: maximum PDU size for the RRLP protocol, which is 242 octets.
RRLP pseudo-segmentation: use of several RRLP data messages to deliver a large amount of information.
Target MS: Mobile Station being positioned.
Type A LMU: accessed exclusively over the air interface (Um interface): there is no wired connection to any other network element.
Type B LMU: is accessed over the Abis interface from a BSC. The LMU may be either a standalone network element addressed using some pseudo-cell ID or connected to or integrated in a BTS.
Velocity Estimate: speed and bearing of an MS and/or valid Mobile Equipment (ME), expressed as speed in kilometres per hour and bearing in degrees measured clockwise from North.
NOTE 2: Abis interface is beyond the scope of the present document.
3.2 Abbreviations
For the purposes of the present document, the following abbreviations and the abbreviations given in 3GPP TS 21.905 apply.
2G- Second Generation
3G- Third Generation
A Interface between GERAN BSS and MSC
A-GNSS Assisted GNSS
A-GPS Assisted GPS
ATD Absolute Time Difference
BDS BeiDou Navigation Satellite System
BSSLAP Base Station System Application Part
BSSAP-LE Base Station System Application Part LCS Extension
CBC-BSC Interface between CBC and BSC
CBC-SMLC Interface between CBC and SMLC
D-GPS Differential GPS
E-OTD Enhanced Observed Time Difference
GNSS Global Navigation Satellite System (e.g. GPS, Galileo)
Iu Interface between GERAN BSS and 3G Core Network
Iu-cs Interface between GERAN BSS and 3G MSC
Iu-ps Interface between GERAN BSS and 3G SGSN
Gb Interface between GERAN BSS and SGSN
Lb Interface between SMLC and BSC
LCCF Location Client Control Function
LCF Location Client Function
LSBcF Location System Broadcast Function
LSCF Location System Control Function
LSOF Location System Operation Function
MTA Multilateration Timing Advance
PCF Position Calculation Function
PRCF Positioning Radio Co-ordination Function
PRRM Positioning Radio Resource Management
PSMF Positioning Signal Measurement Function
RIT Radio Interface Timing
RRLP Radio Resource Link Protocol
RTD Real Time Difference
SMSCB Short Message Service Cell Broadcast
SMLCPP Serving Mobile Location Center Peer Protocol
TA Timing Advance
UDT SCCP Unitdata message
Um GERAN Air Interface
UTC Universal Coordinated Time
U-TDOA Uplink Time Difference of Arrival