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TR-45 Standards Work on Enhanced 911

This document outlines the history and development of Enhanced 911 standards by the TIA and ATIS, detailing the US FCC's Report and Order from 1996, which introduced Phase I and II for emergency calls. It highlights the importance of callback numbers, cell/sector identification, and the necessity of providing accurate location data. Phase I enables callback via the emergency caller's number, while Phase II increases location accuracy. The standards are crucial for ensuring efficient emergency response and optimizing service provider requirements in the 911 system.

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TR-45 Standards Work on Enhanced 911

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  1. TR-45 Standards Work on Enhanced 911 GSC9/GRSC_027 Prepared by: David Crowe, Consultant to Qualcomm, David.Crowe@cnp-wireless.com Presented by: Cheryl Blum, Chair TIA TR-45

  2. E911 History • The US FCC released a ‘Report and Order’ in 1996 (94–102) to provide: • a callback number and cell/sector identification (‘Phase I’). • more accurate location (‘Phase II’). • This was revised in 1999 and allowed handset-based location technologies. • The TIA developed J-STD-034 with ATIS to address Phase I in 1997. • J-STD-036 was first published in 2000 to address Phase II. Revision B is now under development.

  3. J-STD-036 Reference Model

  4. Callback • Providing the telephone number of the emergency caller allows calls to be made back after the emergency call (e.g., to obtain more information). • A pseudo-callback number is provided for non-subscribers, based on the ESN, IMEI or MEID. It allows identification of the caller, but not callback. • Callback uses standard inter-system call delivery (e.g., based on TIA-41).

  5. Cell/Sector Identification • Identifies the cell from which an emergency call was made. • Provides crude location. • Helps route to the correct PSAP. • May be transmitted directly as an ESRD, or indirectly via an ESRK (followed by a database lookup).

  6. Accurate Location • Network based solutions must provide 100 meter accuracy 67% of the time, 300 meters 95% of the time. • Handset based solutions must provide 50 meter accuracy 67% of the time, 150 meters 95% of the time. • Location (as lat/long) is usually provided after initial call setup. • Interim location may be provided during call setup to allow more accurate PSAP routing.

  7. Summary • TIA/ATIS J-STD-034 supports the US FCC Phase I Enhanced Wireless 911 mandate. • TIA/ATIS J-STD-036 supports the US FCC Phase II mandate, along with emerging wireless carrier/emergency call taker requirements.

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