Aeroscout Random
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Transcript of Aeroscout Random
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Michael K. DempseyChief Technology Officer
[email protected](978) 337-0864
And in This Corner .Active RFID vs. WiFi for
Indoor Positioning Systems
Agenda
What is Indoor Positioning System (IPS)?
How does IPS work?
What are some important parameters of IPS?
How do these parameters compare between Active RFID and WiFi?
What is an Indoor Positioning System?
Indoor Positioning Solutions (IPS) are analogous to GPS in an indoor spaceThese can be based on:
Active RFID TransmittersWiFi TransmittersInfrared TransmittersUltrasonic Sound WavesOther types of Radio Transmitters
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The Value of IPS
IPS are valuable and allow you to:
Reduce lossImprove workflow
Improve patient safetyImprove regulatory compliance
Gather better utilization data
Manage rental equipment more effectivelyMake IT systems aware of location
Typical IPS System
Hospital LAN
Server
ID-tag
Receiver or AP
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Power InjectorNetwork Switch
Typical Information Flow
Other Systems
Location Software
Web Browser
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What are Some Important Specifications for any IPS?
AccuracyPrecisionTag SizeTag Battery LifeSupport and Maintenance Risk Ease of InstallationStandards Compliance & Integration with other systems
Accuracy of WiFi IPSWiFi systems determine location based on either Signal Fingerprinting or triangulationBoth methods suffer from changes to the radio environmentFingerprinting requires frequent relearningTriangulation requires precise time synchronizationThere is no peer reviewed data documenting the accuracy of 802.11 based systems
Accuracy of Active RFID IPS
These systems use various techniques (reception range limitation, line-of-site communications, multilateration, etc) to improve accuracyActive RFID systems typically have much less floor hopping than 802.11 based IPSPeer reviewed data supports this
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PrecisionActive RFID & 802.11 systems claim 1 3 MVery dependent on the number of AP s or receiversAgain, independently published data is crucial for determining precision claimsMatch the level of precision that you need to that provided by the system.
Tag Size (inches)Radianse: 2.0 x 1.2 x 0.8RF Code: 2.4 x 1.2 x 0.4Pango: 3.5 x 2.0 x 1.0AeroScout: 2.4 x 1.6 x 0.7Ekahau: 1.9 x 2.2 x 0.9
Tag Battery Life
35¢12 sec5 yrsRF Code
46¢10 sec2 yrsRadianse
recharge10 sec1 dayEkahau
$3.00 minimum
10 sec1.3 yrAeroScout
unknown10 sec1 dayPango
Battery Cost
Update Rate
Life
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Tag EMI Issues
802.11 tags must, by definition, be 802.11 compliant
This high output power causesThe inability to be used on patients
Short battery life
Possible EMI issues
7925100.003Tag Power* (mW)
Aero-Scout
EkahauPangoRadianse & RF Code
* As reported on the FCC website
Ease of MaintenanceWith 802.11 systems, more AP s mean more channel management issues
Some 802.11 asset tags require an IP address
If the radio environment changes, the 802.11 system needs to relearn
Non 802.11 receivers are install and forgetand are more secure
Ease of InstallationTo achieve the specified precision a high density of AP s are required in 802.11 based systems this is not free
To get room-level accuracy we needed to increase the number of AP s from 3 to 8. Initially 3 AP s served all of our data needs for the ED, but then we moved to voice over IP and needed to increase that to 5. When we did the survey with Pango we needed to bring the total up to 8.
John Powers, Chief Administrative Information Officer, CareGroup; RFID in Healthcare, October 2004
802.11 and Active RFID solutions both use standard wired and wireless networks
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Standards Compliance and/or Integration with Other Systems
The key here is that any IPS must be open and easily integrate to other IT systems No IEEE standard for Active RFIDIs an ANSI standard802.11 based IPS conform to the IEEE 802.11 standard at the radio layer; some comply with ANSI at the data layerActive RFID systems typically comply with ANSI standard at the data layer
Bottom Line: 802.11 vs RFID
Active RFID for IPS isLess expensiveMore preciseMore accurateLower risk to install and maintainIntegrates betterHas lower ongoing costs
This is due to the use of special readers; the cost to install these is low and decreasing with wireless and other options
802.11 Competitive Summary
NoNoNoYesPeople Track
1.5 x 2.52 x 2~ 2 x 3.51 x 1.7 and
2 x 2.7Tag Size
3 4 M with floor hopping
3 4 M with floor hopping
3 4 M with floor hopping
1 2 M with no hopping
Accuracy
1000 ?1000 ?1000 ?25,000 tagsScaleability
1.3 yrs1 day10,000 pings2 years
6.3M pingsBattery Life
?$2.5K$5K$1.26KPrice/ Licensed bed over 5 Years
$85$65$200/yr for 3
years$10 & $30Tag Price
WiFi 3WiFi 2WiFi 1A-RFID