A-GPS Control Plane Location Support
USER DESCRIPTION
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Copyright
© Ericsson AB 2011. All rights reserved. No part of this document may be
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Contents
Contents
1
Introduction
1
1.1
Basic Characteristics
1
1.2
Benefits
1
2
Feature Operation
3
2.1
Network Requirements
3
3
Parameters
5
3.1
Introduced Parameters
5
3.2
Affected Parameters
5
4
Network Impact
7
5
Associated Features and Affected Functions
9
5.1
Prerequisite Features
9
5.2
Affected Features
9
5.3
Related Features
9
5.4
Affected System Functions
9
6
Performance
11
6.1
KPIs
11
6.2
Counters
11
6.3
Events
11
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A-GPS Control Plane Location Support
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Introduction
1
Introduction
This document describes the A-GPS Control Plane Location Support feature.
The A-GPS Control Plane Location Support feature in the RBS enables the
operator to keep the location node updated, through OSS-RC, about the
geographic data of the cells served by the RBS. An update is sent whenever
a change occurs in any of these cell parameters. The location node uses
these cell data when compiling the assistance data sent to the UE on the
control plane bearer and when, for the UE assisted mode, calculating the UE
positioning based on the GPS measurements reported by the UE. The location
node in the control plane architecture is the Evolved Serving Mobile Location
Center (E-SMLC).
1.1
Basic Characteristics
This section describes the basic characteristics of the feature.
Feature identity:
FAJ 221 1792, A-GPS Control Plane Location Support
Replaces:
N/A
Dependencies
This feature requires the following RAN features to be active:
This feature has no prerequisite features.
This feature affects the following RAN features:
This feature affects no other features
1.2
Benefits
This section describes the benefits of this feature.
The A-GPS method is the main positioning method (accuracy of 20-50 meters)
to enable the operator to comply with the Federal Communications Commission
(FCC) phase 2 accuracy requirements on positioning of emergency calls.
Furthermore it can serve as the positioning method for a wide variety of
commercial services which require a high location accuracy.
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Feature Operation
2
Feature Operation
This section describes the A-GPS Control Plane Location Support feature in
more detail, including network configuration requirements and operation flows.
2.1
Network Requirements
The following must be fulfilled at feature activation:
•
A location node, that is, an E-SMLC is defined and available in the network
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Parameters
3
Parameters
This section describes parameters introduced by the A-GPS Control Plane
Location Support feature and parameters affected by activating the feature.
3.1
Introduced Parameters
The following table describes the parameters introduced by the feature. For
generic cell parameters also used by this feature, see Radio Network
Table 1
3.2
Cell Geographical Parameters
Parameter
Description
altitude
The altitude of the transmitter antenna in meters above the
WGS84 reference ellipsoid. Use +/- values to denote height/depth.
confidence
Percentage of confidence that the target device is within the
ellipsoid defined by the three axes of uncertainty: semi-major,
semi-minor, and altitude.
eutranCellCoverage
Models the cell coverage area used for UE positioning. The cell
coverage area is defined by the cell bearing, cell opening angle
and cell radius. Cell opening angle = 0 implies an omni cell.
eutranCellPolygon
Models the manageable characteristics for the cell polygon used
for UE positioning. Each polygon corner is described by a latitude
and longitude pair. Each polygon corner is represented with
one position in the sequence. The other configured polygon
corners follow in sequence. There must at least be three corners
configured in a polygon when the function is active/used. The
points shall be connected in the order that they are given. The last
point is connected to the first point.
latitude
The degree of latitude of the transmitter antenna position
longitude
The degree of longitude of the transmitter antenna position
uncertAltitude
The uncertainty altitude (h) expressed in meters is derived from
the uncertainty altitude (k) by h = 45*((1.025)^k - 1).
uncertSemiMajor
Semi-major axis of uncertainty. The uncertainty (r) is derived from
the uncertainty code (k) by: r = 10 * ((1.1^k) - 1).
uncertSemiMinor
Semi-minor axis of uncertainty. The uncertainty (r) is derived from
the uncertainty code (k) by: r = 10 * ((1.1^k) - 1).
Affected Parameters
The implementation of this feature affects no parameters.
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Network Impact
4
Network Impact
The implementation of this feature has no impact on the network.
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Associated Features and Affected Functions
5
Associated Features and Affected
Functions
This section describes how the A-GPS Control Plane Location Support feature
affects other features and functions.
5.1
Prerequisite Features
This feature has no prerequisite features.
5.2
Affected Features
This feature affects no other feature.
5.3
Related Features
There are no other features related to this feature.
5.4
Affected System Functions
This feature affects no system functions.
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Performance
6
Performance
This section describes performance indicators, counters, and events associated
with the A-GPS Control Plane Location Support feature.
6.1
KPIs
This feature has no associated Key Performance Indicators (KPIs).
6.2
Counters
This feature has no directly associated counters.
6.3
Events
There are no events associated with this feature.
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