Browse Prior Art Database

PROVIDE E911 PHASE 2 SUPPORT FOR INTERNATIONAL MOBILES USING A POOL-BASED MOBILE ID

IP.com Disclosure Number: IPCOM000126195D
Original Publication Date: 2005-Jul-06
Included in the Prior Art Database: 2005-Jul-06
Document File: 2 page(s) / 69K

Publishing Venue

Motorola

Related People

Mohamad H. Fayad: AUTHOR [+2]

Abstract

Legacy Public Safety Access Points (PSAP) currently accept only ten digit callback numbers for emergency callers. Callback numbers of international mobiles capable of E911 Phase 2 are truncated to ten digits. This compromises the system's ability to provide location updates to PSAPs in both methods of data access, Emergency Services Routing Key (ESRK) and Emergency Services Routing Digits (ESRD) from Gateway Mobile Location Center (GMLC). Initial mobile location is also compromised when using ESRD access method. This has resulted in on-going industry reviews for providing complete callback number and seamless E911 Phase 2 support implementations to legacy PSAPs. Currently a prevailing idea is to use a pseudo callback number to access data from GMLC. This approach introduces additional complexity within the MSC and runs counter to GSM routing procedures.

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Provide E911 Phase 2 support for International Mobiles using a pool-based

mobile

ID.

by Mohamad H. Fayad and Dhananjay Joshi

ABSTRACT

Legacy Public Safety Access Points (PSAP) currently accept only ten digit callback numbers for emergency callers. Callback numbers of international mobiles capable of E911 Phase 2 are truncated to ten digits. This compromises the system's ability to provide location updates to PSAPs in both methods of data access, Emergency Services Routing Key (ESRK) and Emergency Services Routing Digits (ESRD) from Gateway Mobile Location Center (GMLC).  Initial mobile location is also compromised when using ESRD access method.

This has resulted in on-going industry reviews for providing complete callback number and seamless E911 Phase 2 support implementations to legacy PSAPs.  Currently a prevailing idea is to use a pseudo callback number to access data from GMLC. This approach introduces additional complexity within the MSC and runs counter to GSM routing procedures.

PROBLEM

The 10-digit limitation by the legacy Public Safety Access Points (PSAPs) presents the wireless mobile network and intermediate routing nodes from delivering the full MSISDN of the emergency caller.  This raises a problem in matching the caller’s MSISDN in the Gateway Mobile Location Center (GMLC) and retrieving the relevant caller location information.  Currently, there is an interim solution that uses a 10-digit pseudo number based on the caller’s mobile IMEI to substitute for the real MSISDN.  While this method enables a match on the caller in the GMLC, update requests on the mobile location are not possible because the pseudo number used is not treated as a real MSISDN by the wireless GSM network.

A need...