Transcript TR41.4-01-02-007A-BlueToothPositioningV5.ppt

Local Positioning
Mike Overy
([email protected])
Chair Local Positioning WG
Local Positioning v5.ppt #1 Mike Overy
Local Positioning - Content:
 Introduction
 Applications
 How it works
 Usage scenarios
 Key points
Local Positioning v5.ppt #2 Mike Overy
Local Positioning - Introduction
 Local Positioning is any positioning technology, used to
determine the position of devices, relative to one or more
other nearby devices, whose positions are known.
 There are already several proprietary wireless Local
Positioning technologies in use, for niche applications.
 Bluetooth has the potential to offer Local Positioning at
minimal cost and with maximum geographic coverage.
 'Pervasive computing' will require location awareness.
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Local Positioning - Applications
 Class 1
For devices with no other positioning capability.
e.g. for: Laptops, notebooks, PDA's, tag's etc.
 Class 2
For devices with GPS and / or cellular positioning capability, to
improve performance indoors and in built up locations.
e.g. for: cellphones.
 Target is to provide GPS like accuracy (3-30m outdoors), in indoor
environments.
 Applications include finding: people, places, services, items etc.
 The market for location based services is forecast to be huge.
e.g. Strategis Group estimate >$30b in 2005.
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Positioning - Application Areas
Remote
Rural
GPS
Cellular
Positioning
eg E-OTD
Urban
Cell I.D.
City/
Indoor
Precision
Local
Positioning
(UWB)
0.1
0.3
Bluetooth
Local Positioning
1
3
10
30
100
Accuracy (metres)
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300
1K
3K
10K
30K
Local Positioning - How it works
 Relies on the short range of Bluetooth connections ( ~ 10m).
 Device position equals:
source position, +/- (accuracy + estimated range).
 Accuracy can be improved by picking up more devices and/or
estimating proximity (distance apart).
 Proximity can be estimated based on:
range, signal strength, and/or time delay.
 Signal strength is easily measured, but correlation to distance is
fuzzy.
 Time delay would require additional hardware to measure, but
correlates exactly to distance.
The time delay method is not currently supported for Bluetooth.
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Local Positioning - Usage Scenario #1
 Portable device picks up position data from nearby device(s).
 Nearby devices may be pre-programmed 'beacons'.
 Nearby devices may instead have their own positioning capability,
such as GPS and/or LP.
 Data content includes: latitude, longitude and accuracy.
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Local Positioning - Usage Scenario #2
 Laptop, PDA or phone accesses nearby GPS receiver.
 e.g. I run a positioning application on my laptop, which gets its
position from the phone in my pocket.
 2 part solution, i.e. cable replacement.
 Devices may be 'pre-registered'.
 Can 'remotely activate' positioning device, if shut down.
 Also supports use of GPS in vehicles.
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Local Positioning - Key Benefits
 Local Positioning is targeting to maximise the value of Location,
with minimum cost.
 Potential to provide GPS like accuracy indoors, virtually 'for
free'.
 Numerous Location Dependent applications and services are
possible (but not part of the profile).
 Authors prediction: "as GPS and Bluetooth become widely used,
most wireless devices will include positioning capability".
Local Positioning v5.ppt #9 Mike Overy