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Accurate Indoor Call Location Information To First Responders
Posted: 23-Apr-2013 [Source: TruePosition]

[The FCC is testing technologies for precise position determination for wireless calls originating from indoor locations.]

Berwyn, PA -- TruePosition Inc., a provider of wireless location solutions and a subsidiary of Liberty Media Corporation, announces the release of results from indoor tests of its hybrid wireless location technology combining the Uplink Time Difference of Arrival (U-TDOA) and Assisted Global Positioning System (A-GPS) methods. Of the four technologies tested, U-TDOA was the only one to have a 100 percent yield in both urban and suburban performance testing, with every test call generating corresponding location information.

The U.S. Federal Communications Commission (FCC) estimates that 70 percent of 911 calls are placed from wireless phones and it is further estimated that as many, if not more, than 50 percent of these wireless 911 calls originate indoors. To address concerns about the ability of existing technologies to locate wireless 911 calls made from indoor areas, the FCC is gathering data of the existing and emerging wireless location technologies.

"Tests conducted in San Francisco and in Wilmington, Del. and elsewhere clearly show that providing accurate location information to first responders when the call originates from a wireless phone indoors is an achievable goal," said Steve Stuut, TruePosition CEO. "The combination of U-TDOA and A-GPS location technologies is an excellent solution for locating indoor 911 calls, or other situations where yield and accuracy are critical."

"U-TDOA and A-GPS technologies are both widely deployed in the U.S. today, and when combined, provide a solution that is not only technically superior, but also commercially viable and imminently available," said Stuut. "U-TDOA, currently deployed on AT&T's and T-Mobile's networks, is already protecting the millions of AT&T and T-Mobile customers who dial 911 from their wireless phones, making it easier and faster for first responders to find them indoors; and can easily be paired with existing AGPS capabilities in a hybrid solution."

Testing and Results: The test methodology was designed by an FCC advisory committee, the Communication, Security, Reliability and Interoperability Council (CSRIC), Working Group 3 (WG3). The test methodology was created to ensure representative results for a statistically significant number of test calls made from multiple building types and environments. Performance characteristics tested include accuracy, latency, yield, reported uncertainty and location scatter. The San Francisco and Wilmington tests were separately conducted by the same independent third party.

Results for two critical performance characteristics, location yield and location accuracy in urban and suburban environments are listed in Table 1.


Yield

Location Accuracy

67th Percentile

90th Percentile

95th Percentile

Urban Performance





NextNav (Terrestrial Beacons)

95.4%

62.8m

141.1m

196.1m

Polaris Wireless (Radio Fingerprinting)

99.9%

198.4m

447.8m

729.9m

Qualcomm (A-GPS)

90.8%

226.8m

449.3m

507.1m

TruePosition (U-TDOA/A-GPS Hybrid)

100.0%

87.3m

140.7m

163.2m

Suburban Performance





NextNav

100.0%

28.6m

52.9m

62.2m

Polaris Wireless

99.8%

232.1m

420.7m

571.4m

Qualcomm

91.4%

75.1m

204.8m

295.7m

TruePosition

100.0%

66.1m

116.2m

155.7m

Table 1: Selected Indoor Test Results

The first three technologies listed were tested in the San Francisco, Calif. area, while the TruePosition system was tested in Wilmington, Del. Both reports are available for download in the following locations:

San Francisco Report:

http://transition.fcc.gov/bureaus/pshs/advisory/csric3/CSRIC_III_WG3_Report_March_ 2013_ILTestBedReport.pdf

Wilmington Report:

http://apps.fcc.gov/ecfs/document/view;jsessionid=8pTcRsLZL0MRYWh57JbL6Q8ywnp7pQRknm7Qm7XnzmvtFhm6LWJT!-817071755!638063854?id=7022133923

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