For the purposes of the present document the following terms and definitions apply and the terms and definitions given in TS 22.101
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.
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).
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.
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.
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.
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.
use of several RRLP data messages to deliver a large amount of information.
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.
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.
For the purposes of the present document, the following abbreviations and the abbreviations given in TR 21.905
Interface between GERAN BSS and MSC
Absolute Time Difference
BeiDou Navigation Satellite System
Base Station System Application Part
Base Station System Application Part LCS Extension
Interface between CBC and BSC
Interface between CBC and SMLC
Enhanced Observed Time Difference
Global Navigation Satellite System (e.g. GPS, Galileo)
Interface between GERAN BSS and 3G Core Network
Interface between GERAN BSS and 3G MSC
Interface between GERAN BSS and 3G SGSN
Interface between GERAN BSS and SGSN
Interface between SMLC and BSC
Location Client Control Function
Location Client Function
Location System Broadcast Function
Location System Control Function
Location System Operation Function
Multilateration Timing Advance
Position Calculation Function
Positioning Radio Co-ordination Function
Positioning Radio Resource Management
Positioning Signal Measurement Function
Radio Interface Timing
Radio Resource Link Protocol
Real Time Difference
Short Message Service Cell Broadcast
Serving Mobile Location Center Peer Protocol
SCCP Unitdata message
GERAN Air Interface
Universal Coordinated Time
Uplink Time Difference of Arrival