wireless e911 overview and status update
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Wireless E911 Overview and Status Update. David Woodcock Director, Product Management Motorola Canada PCS [email protected]. FCC E911 Mandate. This year* 100m accuracy for 67% of calls 300m accuracy for 95% of calls Phase 2* 50m accuracy for 67% of calls - PowerPoint PPT PresentationTRANSCRIPT
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Wireless E911 Overview and Status Update
David WoodcockDirector, Product Management
Motorola Canada PCS
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FCC E911 MandateThis year*• 100m accuracy for 67% of calls• 300m accuracy for 95% of calls
Phase 2*• 50m accuracy for 67% of calls• 150m accuracy for 95% of calls
Subscriber Activations*• Certain % of new adds must be location-capable
*Exact dates and mandate vary by carrier
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Position Determination OptionsPosition Determination OptionsNetwork-Based Assisted GPS
• Technologies– TDOA (3 sites minimum)– AOA (2 sites minimum)– Multipath “Fingerprint” (1
site minimum)• New site equipment• Legacy handset are
supported
• Handset modifications– Memory– A-GPS Integrated Chip Sets– Second Antenna– Software
• 1 site + 3 GPS Sat solution• New network boxes• Legacy handsets not
supported
ServingCell
NeighborCell # 1
NeighborCell # 2
MS
Wideband orScanningReceivers
LocationCalc & Control
GPSAssist
E-OTD/AFLT
ServingCell
NeighborCell # 1
NeighborCell # 2
MSSynchronizedSites or LMU’s
• Handset modifications– Software– Memory
• TDOA (3 sites minimum)• May require new site
equipment & network boxes• Legacy handsets not
supported
ServingCell
MS
LocationCalc & Control
GPSSat
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How they compare
MLCMLC
MLCMLC
Increase in Accuracy
Increase in Coverage (Dense Urban, Valleys, Indoors)
Increase
Accuracy
Cell ID EOTD, AFLT GPS (Auto) A-GPS (Assist)
HS Changes None Software SW + HW SW + HWAdded Cost None Low High HighAccuracy 100-1000 m (Cell) 75- 300 m 15-150 m 1-100 m TTFF < 5 Sec 5-20 Sec 10-60 Sec <5 Sec
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Hybrid: EOTD / AFLT
Network sends a burst message to the handset
Handset calculates time differentials & reports back.
Network calculates handset position
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Hybrid: AGPS
GPS
Assistance data
Network provides assistance data to handset to limit satellite acquisition times.
Handset receives GPS data from satellites (three required for position determination)
Handset reports ‘pseudo-ranges’ to network for position determination.
Pseudo-ranges
Network calculates handset position
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Handset vs. Network Based
• Pros– Minimum Network Impact– Greater Subscriber Privacy?– Proven High Degree of
Accuracy Using GPS– Less network maintenance
• Cons– Legacy Issue
– Handset size, cost, battery life
– GPS antenna issues
• Pros– Ability to Deploy
on an as Needed Basis
– Addresses Legacy Phones and Roamers
• Cons– More Site Antennas or new sites may
be Required in Some Areas
– Additional Equipment At Cell Site
– Large Initial Capital Requirement
– Calibration and additional maintenance
Handset Network
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U.S. Carrier Plan of Record
Carrier MA Location TechnologyGSM E-OTD
TDMA/GSM Network / E-OTDTDMA/GSM Network / E-OTDCDMA2000 AGPS/AFLTCDMA2000 AGPS/AFLTCDMA2000 AGPS/AFLT
iDEN AGPS
U.S. Carriers have selected handset-based solutions
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Motorola Handset RoadmapGSM/GPRS• Several EOTD-capable products launching in
2H02• All future products will have EOTD
CDMA/1X• One AFLT handset launching in June• Three AGPS handsets launching in 2H02• All future products will have AGPS
Multiple hardware and software solutions available for EOTD / AGPS
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Then What?
Carrier network must calculate and report location to PSAP
“Push” – if location information is available at call-setup
“Pull” – if not available initially, or to update location information during call
PSAPs must be ready to integrate ALI from wireless devices
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Issues…Relevance
– Does the (mobile) location data have any meaning?– How current is it? (street addresses can’t move…)
Accuracy– Performance in urban and rural areas– Satellite acquisition / multi-path signals– Cell site separation
Privacy– Do users really want to be found?– Users have ability to disable location service except during
911 calls
The challenge goes beyond technology
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Handset capabilities are just the foundation
Network location determination
PSAP capabilities
Handset location capabilities
Data Usefulness
Many bricks needed to build the structure
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Thank you
www.motorola.ca