E911 SolutionBy: Mo Zonoun

February, 2000

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Bluetooth wireless technology

• Bluetooth facilitates real-time voice and data transmissions, which makes it possible to connect any portable and stationary communication devices.

• Connections are instant and they are maintained even when devices are not within line of sight.

• Instant connection to another Bluetooth radio as soon as it comes into range.

• Supports both point-to-point and point-to-multipoint connections

• Several piconets can be established and linked together.

• Supports email, two way messaging, LAN and IP access

• Fully functional in noisy environment

• Data are protected by advance error-correction method, encryption and authentication routine for privacy.

• For more information see (http://www.bluetooth.com).

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Bluetooth Specification

Normal Range 10m (0dbm)

Optional Range 100m (+20 dbm)

Normal Transmitter Power 0dbm (1mw)

Optional Transmitter Power -30 to +20 dbm (100mw)

Receiver Sensitivity -70 dbm

Frequency 2.4 GHz

Cross Data Rate 1 Mbits/s

Max Data Transfer 721+56 kbits/ 3 Voice Channel

Power Consumption, Hold/Park ~50 uA

, Standby 300 uA

, Max 30 uA

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Solution• Bluetooth devices are installed in various locations as beacon which communicate their

physical locations to the desk top and portable devices when activated by a 911 call.

• Two methods are recommended for the installation of Bluetooth beacon: a) LAN wall outlet (for 10 meter “Normal” range of Bluetooth operation) or b) Central (for 100 meter “Optional” range of Bluetooth operation).

• For (a) method, a Bluetooth device is integrated into each wall outlet and powered from the LAN permanently or when devices are plugged into LAN’s wall outlet.

• For (b) method, each device is powered directly with battery back up.

• The beacon is in a standby mode until it detects a nearby Bluetooth device, in which case becomes operational.

• The beacon is programmed to transmit a code representing its physical location or coordinates when activated by 911 call.

• The physical location coordinates transmitted by the beacon will be picked up by the device that initiated the 911 call and transported over IP to the E911 server.

• The E911 server determines the appropriate jurisdiction and provides support for the call server to establish call with the PSAP.

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IPIPx

yz

x,y,z

Bluetooth Solution

Wall MountedLAN Connector

Bluetooth Transmitter

E911 Server

a

Call Server

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Information Flow for 9-1-1 Calls

PSAPE911Server

Bluetooth Beacon

AppropriateJurisdiction tel.no.

De-activate Transmit ter

E911 call establishment

E911 Call

E911 Call withEmbebed Loc & Call back #

CallServer

Loc. RequestActivatedBeacon

Loc CodeLoc. Code

E911 Call

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Advantage

• Provides accurate location information (10 meter for wall outlet method).

• Supports all scenarios including VPN and Telecommuter location information.

• Interoperate with Cellular and wireless devices equipped with Bluetooth.

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• Not backward compatible

• Requires retrofitting of the sets

• Requires industry adoption to provide 100% coverage for the VPN.

Disadvantage