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A METHOD FOR ALLOWING RADIOS TO ROAM BETWEEN ZONES IN A WIDE AREA COMMUNICATION SYSTEM

IP.com Disclosure Number: IPCOM000008429D
Original Publication Date: 1997-Dec-01
Included in the Prior Art Database: 2002-Jun-13
Document File: 1 page(s) / 74K

Publishing Venue

Motorola

Related People

Andrew L. Karsen: AUTHOR [+3]

Abstract

A wide area communication system is com- posed of multiple zones which are interconnected to form one very large system. Each of these zones is then composed of multiple communication sites, which arc interconnected via the zones, thus allowing communication between any site in the system. Each of the zones in the system has a unique identi- fication (zone ID) which is broadcast on the control channel of each communication site within the zone. Subscriber units (SU) active on the system need a mechanism to freely roam to any site in any zone in the system without having to have prepro- grammed knowledge of all of the zone IDS in the system.

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6% MOTOROLA Technical Developments

A METHOD FOR ALLOWING RADIOS TO ROAM BETWEEN ZONES IN A WIDE AREA COMMUNICATION SYSTEM

by Andrew L. Karsen, Daniel J. McDonald and Marcellus W. Cassidy

  A wide area communication system is com- posed of multiple zones which are interconnected to form one very large system. Each of these zones is then composed of multiple communication sites, which arc interconnected via the zones, thus allowing communication between any site in the system. Each of the zones in the system has a unique identi- fication (zone ID) which is broadcast on the control channel of each communication site within the zone. Subscriber units (SU) active on the system need a mechanism to freely roam to any site in any zone in the system without having to have prepro- grammed knowledge of all of the zone IDS in the system.

  It is required that each SU have knowledge of the zone ID for the zone that it is operating on. This is a necessary piece of information for processing calls. It is desirable to not pre-program all of the zone IDS associated with the system in each subscriber unit since expansion of the system would result in continuous reprogramming of the subscriber units, A problem arises when a SU syn- chronizes to a control channel and the zone ID is unknown to the SU. A mechanism is needed to allow the radio to determine if this zone is a usable zone and to quickly recover the zone ID of the monitored zone.

  The SU, upon synchronizing to a control chan- nel and determining that this control channel is associated with a zone that is unknown to the SU, will perform a unique registration procedure. This registration proc...