Browse Prior Art Database

GSM OPTIMAL ROUTING ADDRESS RESOLUTION SCHEME

IP.com Disclosure Number: IPCOM000008978D
Original Publication Date: 1999-Jan-01
Included in the Prior Art Database: 2002-Jul-29
Document File: 2 page(s) / 73K

Publishing Venue

Motorola

Related People

David F. Chambers: AUTHOR [+2]

Abstract

GSM Networks process originating calls at a Gateway MSC. Currently, this network element must determine whether the number dialed is a mobile number on the same network, or a PSTN number. A routing table is maintained within the MSC which analyzes the number dialed, and deter- mines (usually from the prefix) the type of number. Mobile calls on the same network are then routed to the appropriate HLR, usually from the GMSC directly but sometimes by an STP function.

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MOTOROLA Technical Developments

GSM OPTIMAL ROUTING ADDRESS RESOLUTION SCHEME

by David F. Chambers and Erick O'Connor

BACKGROUND PROPOSED SOLUTION

  GSM Networks process originating calls at a Gateway MSC. Currently, this network element must determine whether the number dialed is a mobile number on the same network, or a PSTN number. A routing table is maintained within the MSC which analyzes the number dialed, and deter- mines (usually from the prefix) the type of number. Mobile calls on the same network are then routed to the appropriate HLR, usually from the GMSC directly but sometimes by an STP function.

  With the advent of Optimal Routing, the GMSC is now expected to determine whether the number dialed is a mobile number on any GSM mobile net- work with which it optimally routes. The relevant network HLR is then queried directly to determine where to route the call. Many networks have com- plex number range allocations, and it is no simple task to determine whether the number dialed is a mobile on a particular network or not.

  With over 120 live GSM networks, increas- ing all the time, and the advent of number portabili- ty between networks, the management of the routing tables in each GMSC will easily become un- workable.

  Each mobile network would publish a routing table which deals with E. 164 numbers and identi- fies those which are mobile numbers in its network, and of those, which ones can optimally routed.

  Each mobile network would then be able to dow...