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Browse Prior Art Database

WIDE AREA/LOW DENSITY "MANAGED" DIGITAL CONVENTIONAL SYSTEM

IP.com Disclosure Number: IPCOM000008001D
Original Publication Date: 1997-Mar-01
Included in the Prior Art Database: 2002-May-10
Document File: 2 page(s) / 110K

Publishing Venue

Motorola

Related People

James Livas: AUTHOR [+2]

Abstract

In existing wide area (multi-site)/low density conventional systems, subscriber units are not locat- ed/tracked by the infrastructure. Thus, as subscriber units move from site to site, the dispatcher(s) and other subscriber units do not know the location of moving units. This makes establishing communica- tion links between field units and dispatch difficult.

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MOTOROLA Technical Developments

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WIDE AREA/LOW DENSITY "MANAGED" DIGITAL CONVENTIONAL SYSTEM

by James Livas and Perry Reh

BACKGROUND:

  In existing wide area (multi-site)/low density conventional systems, subscriber units are not locat- ed/tracked by the infrastructure. Thus, as subscriber units move from site to site, the dispatcher(s) and other subscriber units do not know the location of moving units. This makes establishing communica- tion links between field units and dispatch difficult.

  These systems have traditionally relied on sub- scriber units manually selecting (via a radio mode) a site/station when talking to dispatch. They also rely on dispatch to manually establish a radio patch to connect subscriber units operating on different sites. Conversely, dispatchers are required to sys- tematically key several sites to locate target sub- scriber units.

PROBLEM:

  This type of system operation has several disad- vantages. 1) inefficiencies result as subscriber units must manually select the nearest site. If the proper site is not selected important communications can be missed. 2) subscriber units can only talk to other subscribers on the same site-this assumes the other subscribers have the proper site selected, if not, some sort of console radio patch is required 3) time is wasted as dispatchers must manually locate roaming subscriber units which might involve "searching" for field units by tryingikeying multiple sites. It is also possible that the dispatcher might not reach a subscriber if that unit has selected a site on which they are out of range. 4) dispatchers typically hear all radio traffic even if he/she is only responsi- ble for certain groups of subscribers.

SOLUTION:

This invention proposes enhancements to a Motorola APCO 25, digital conventional system

that provides seamless roaming. The proposal calls for locating subscriber units and storing field unit locations in an interactive data base. Automatic assignment of calls can then be accomplished as audio is routed from an aud...