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A METHOD FOR PROVIDING MOBILE LOCATION SERVICE IN GSM-BASED NETWORK USING PACKET DATA AND SHORT MESSAGE SERVICE

IP.com Disclosure Number: IPCOM000009313D
Original Publication Date: 1999-Jun-01
Included in the Prior Art Database: 2002-Aug-15
Document File: 4 page(s) / 278K

Publishing Venue

Motorola

Related People

Roger Griffith: AUTHOR [+3]

Abstract

In the United States, the Federal Commun- ications Commission (FCC) has issued a mandate, commonly known as the FCC E911 Phase 2 ruling which states, that by October 2001, a wireless inter- connect service provider must be capable of deliver- ing location information accurate to 125 meters 67% of the time for 911 emergency calls. This enhanced capability must be provided upon request of a Public Safety Answering Point which has met specific funding and provisioning requirements.

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MOTOROLA Technical Developments

A METHOD FOR PROVIDING MOBILE LOCATION SERVICE IN GSMBASED NETWORK USING PACKET DATA AND SHORT MESSAGE SERVlCE

by Roger Griffith, Bradley Jenti and Kamala Urs

  In the United States, the Federal Commun- ications Commission (FCC) has issued a mandate, commonly known as the FCC E911 Phase 2 ruling which states, that by October 2001, a wireless inter- connect service provider must be capable of deliver- ing location information accurate to 125 meters 67% of the time for 911 emergency calls. This enhanced capability must be provided upon request of a Public Safety Answering Point which has met specific funding and provisioning requirements.

  This FCC ruling places the burden upon wire- less manufactures to provide an appropriate, cost effective solution to meet this challenge. With the introduction of this type of location granularity, wireless suppliers are likely to provide new loca- tion-based services to offset the cost of deploying new infrastructure required to support the FCC man- date. To ease the burden of costly development and deployment, wireless manufactures will favor lever- aging off existing architectures where possible.

   To meet FCC ruling, Motorola's "integrated Digital Enhanced Network" (iDEN) is considering two basic approaches:

  l Infrastructure overlay approach - which focus- es the hardware and software changes at the fixed network equipment, with virtually no changes to existing mobile handsets or,

  l Subscriber based approach - which places the focus of changes at the mobile handset with little or no changes to the fixed network architecture.

   Although there are advantages and disadvan- tages to both approaches, Motorola iDEN is explor- ing two solutions which fall into the "Subscriber based approach".

   One proposed subscriber-based approach calls for the mobile handset to calculate the "time differ-

ence of arrival" or TDOA, between the serving cell and neighboring cells. These measures are expected to take place when an appropriate event (such as dialing 911) triggers the mobile handset (or MS) to execute the TDOA algorithm. Once the TDOA (or some other type of location information) is calculat- ed by the handset, the challenge then becomes trans- ferring the data from the mobile handset to the appropriate fiied network equipment for relay to a final destination. Although this article uses the example of TDOA-based location information, these same facilities could be used to transfer other types of location information as well.

   This article illustrates two possible means for notifying the mobile handset that location informa- tion is needed and relaying the resulting data to a target fixed network entity. To the extent possible, these two proposed solutions leverage off existing Motorola iDEN components. The first embodiment utilizes iDEN's Short Message Service while the second embodiment leverages iDEN's packet data network. Both solutions address two key issues: 1) the fixed ne...