Browse Prior Art Database

FAULT DETECTION BEFORE INDIVIDUAL CALL IN A MULTIZONE TRUNKED SYSTEM

IP.com Disclosure Number: IPCOM000007777D
Original Publication Date: 1996-Aug-01
Included in the Prior Art Database: 2002-Apr-23
Document File: 2 page(s) / 90K

Publishing Venue

Motorola

Related People

John Mistro: AUTHOR

Abstract

MultiZone is a very wide area system that con- sists of standalone zones that have been networked into one homogenous system from the user's stand- point. Call processing in a MultiZone system is han- dled under distributed control of a "zone control- ler" in each zone. As radio users move amongst the zones, it is necessary to provide users the ability to place calls independent ofsystem location.

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Technical Developments

FAULT DETECTION BEFORE INDIVIDUAL CALL IN A MULTIZONE TRUNKED SYSTEM

by John Mistro

BACKGROUND:

  MultiZone is a very wide area system that con- sists of standalone zones that have been networked into one homogenous system from the user's stand- point. Call processing in a MultiZone system is han- dled under distributed control of a "zone control- ler" in each zone. As radio users move amongst the zones, it is necessary to provide users the ability to place calls independent ofsystem location.

  The entity that tracks user mobility amongst the zones is called an HLR (Home Location Register). The HLR holds subscriber registration information in which the system may "look up" what zone a user is currently registered in.

  This article addresses the needs of an interzone individual call (radio to radio), from an HLR availa- bility standpoint. Specifically, the need for a target radio to have access to an initiating radio's HLR before allowing an individual call request to be setup. Note in a MultiZone Trunked system, the HLR may be centralized in one location or distributed amongst the zones. Unless otherwise specified, assume that associated users have been allowed access by the system manager and resources exist in each zone to service call requests.

PRINCIPLE OF OPERATION:

  An individual call request between two subscrib- ers in different zones is accomplished in the follow- ing manner (See Figure 1):

DataPath REQIJREMENTS:

l)Zl&Z2must

E F$yTy=;

Data Path exists to

exists to

Other.

Zone 1 initialing

2) The target's HLR must be Zone 2 available to the initiator.

REidi0

ZlandZ2are
able to process

InterZone Calls

Target Radio Registered

3) The initiator's

HLR must be available to the

Registered

target.

Fig. 1

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