Browse Prior Art Database

DYNAMIC SERVICE AREAS FOR DISPATCH CALLS

IP.com Disclosure Number: IPCOM000008796D
Original Publication Date: 1998-Sep-01
Included in the Prior Art Database: 2002-Jul-15
Document File: 3 page(s) / 126K

Publishing Venue

Motorola

Related People

Arial Pashtan: AUTHOR [+2]

Abstract

Only a selected group of cells (referred to as a "dynamic service area") around the target address will be paged for locating mobile group members, and the dispatch call will be issued to these mem- bers, within the dynamic service area, which responded.

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MOTOROLA Technical Developments

DYNAMIC SERVICE AREAS FOR DISPATCH CALLS

by Aria1 Pashtan and Rod Averbuch

TECHNICAL FIELD

   Only a selected group of cells (referred to as a "dynamic service area") around the target address will be paged for locating mobile group members, and the dispatch call will be issued to these mem- bers, within the dynamic service area, which responded.

  The call request is forwarded (see Figure 2) by the iDEN DAP (Dispatch Application Processor) to an Intelligent Application Processor (IAP) which, from the target address specification, selects a fixed group of cells which form a cluster centered around the target address (shown as the square) specified in the call.

  This latter cluster of cells is referred to as a "dynamic service area" (see Figure 1). The number of cells in the dynamic service area is a constant set by the operator based on the average size of a cell's coverage area (for example, 20 cells will be used for forming a dynamic service area).

  The list of cells in the dynamic service area is forwarded by the IAP to the DAP. The DAP then goes through a procedure of locating mobile group users in the dynamic area. Since the DAP tracks the location areas where talk group members are pre- sent, it will page only those location areas contain- ing the dynamic service area's cells. The group call is then issued only to those cells which responded to the page and which are contained within the dynam- ic service area.

  The technical field is mobility management and call processing procedures for dispatch calls in cel- lular networks. In this disclosure, the referenced mobility management and call processing pro- cedures are from the Motorola iDEN network's procedures.

PROBLEM STATEMENT AND PRIOR ART

  Dispatch service areas are relatively large geo- graphic areas. For example, the Los Angeles area contains six service areas. A selected area dispatch call may light up many cells in the area. The prob- lem gets worse if the caller tries to reach group members at the boundary between two (or more) service areas. The dilemma then is which service area to select, or alternatively to issue a wide area call which is even more inefficient.

  For example, when a caller wishes to reach talk group members close to a certain address (e.g., to dispatch a taxi to a g...