For the purposes of the present document, the terms and definitions given in
TR 21.905 apply.
As used in this document, the suffixes "-based" and "-assisted" refer respectively to the node that is responsible for making the positioning calculation (and which may also provide measurements) and a node that provides measurements (but which does not make the positioning calculation). Thus, an operation in which measurements are provided by the UE to the E-SMLC to be used in the computation of a position estimate is described as "UE-assisted" (and could also be called "E-SMLC-based"), while one in which the UE computes its own position is described as "UE-based".
Both standalone LMU and LMU integrated into an eNB are supported. As used in this document, LMU refers to both cases of a standalone LMU and an LMU integrated into an eNodeB unless explicitly mentioned otherwise.
State Space Representation (SSR):
The state space representation provides information on the status of individual GNSS error sources. State parameter values are transmitted to UE. The user corrects his own observations of a single GNSS receiver with SSR corrections computed from these state parameters for his individual position, and performs RTK positioning with corrected observations. This contrasts with Observation Space Representation (OSR) which uses a lump-sum of distance-dependent GNSS errors instead of individual GNSS error sources. For OSR the representation of RTK network corrections in the observation space always uses GNSS observation of an actual reference station, which are then applied by the user to the conventional RTK algorithm.
Transmission Point (TP):
A set of geographically co-located transmit antennas for one cell, part of one cell or one PRS-only TP. Transmission Points can include base station (eNode B) antennas, remote radio heads, a remote antenna of a base station, an antenna of a PRS-only TP, etc. One cell can be formed by one or multiple transmission points. For a homogeneous deployment, each transmission point may correspond to one cell.
PRS-only TP:
A TP which only transmits PRS signals for PRS-based TBS positioning and is not associated with a cell.
For the purposes of the present document, the following abbreviations apply.
ADR
Accumulated Delta Range
AoA
Angle of Arrival
AP
Access Point
ARP
Antenna Reference Point
BDS
BeiDou Navigation Satellite System
BSSID
Basic Service Set Identifier
CID
Cell-ID (positioning method)
CIoT
Cellular IoT
CLAS
Centimeter Level Augmentation Service
E-SMLC
Enhanced Serving Mobile Location Centre
E-CID
Enhanced Cell-ID (positioning method)
ECEF
Earth-Centered, Earth-Fixed
ECI
Earth-Centered-Inertial
EGNOS
European Geostationary Navigation Overlay Service
E-UTRAN
Evolved Universal Terrestrial Radio Access Network
FDMA
Frequency Division Multiple Access
FKP
Flächenkorrekturparameter (Engl: Area Correction Parameters)
GAGAN
GPS Aided Geo Augmented Navigation
GLONASS
GLObal'naya NAvigatsionnaya Sputnikovaya Sistema (Engl.: Global Navigation Satellite System)
GMLC
Gateway Mobile Location Center
GNSS
Global Navigation Satellite System
GPS
Global Positioning System
GRS80
Geodetic Reference System 1980
HESSID
Homogeneous Extended Service Set Identifier
IoT
Internet of Things
LCS
LoCation Services
LCS-AP
LCS Application Protocol
LMU
Location Measurement Unit
LPP
LTE Positioning Protocol
LPPa
LTE Positioning Protocol Annex
MAC
Master Auxiliary Concept
MBS
Metropolitan Beacon System
MO-LR
Mobile Originated Location Request
MT-LR
Mobile Terminated Location Request
NavIC
NAVigation with Indian Constellation
NB-IoT
NarrowBand Internet of Things
NI-LR
Network Induced Location Request
N-RTK
Network - Real-Time Kinematic
OTDOA
Observed Time Difference Of Arrival
PDU
Protocol Data Unit
posSIB
Positioning SIB
PPP
Precise Point Positioning
PPP-RTK
Precise Point Positioning - Real-Time Kinematic
PRS
Positioning Reference Signal
QZSS
Quasi-Zenith Satellite System
RRM
Radio Resource Management
RSSI
Received Signal Strength Indicator
RTK
Real-Time Kinematic
SBAS
Space Based Augmentation System
SET
SUPL Enabled Terminal
SIB
System Information Block
SLP
SUPL Location Platform
SSID
Service Set Identifier
SSR
State Space Representation
STEC
Slant TEC
SUPL
Secure User Plane Location
TADV
Timing Advance
TBS
Terrestrial Beacon System
TEC
Total Electron Content
TP
Transmission Point
UE
User Equipment
URA
User Range Accuracy
UTDOA
Uplink Time Difference of Arrival
WAAS
Wide Area Augmentation System
WGS-84
World Geodetic System 1984
WLAN
Wireless Local Area Network