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Browse Prior Art Database

SMART TALKAROUND

IP.com Disclosure Number: IPCOM000008497D
Original Publication Date: 1997-Dec-01
Included in the Prior Art Database: 2002-Jun-18
Document File: 3 page(s) / 89K

Publishing Venue

Motorola

Related People

Jaime A. Borras: AUTHOR

Abstract

A smart talkaround algorithm in a dual mode digital Specialized Mobile Radio (SMR) is described. It solves the interference problem of talkaround users roaming into new digital SMR systems.

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8 MOTOROLA

Technical Developments

SMART TALKAROUND

by Jaime A. Borras

ABSTRACT

  A smart talkaround algorithm in a dual mode digital Specialized Mobile Radio (SMR) is described. It solves the interference problem of talkaround users roaming into new digital SMR systems.

INTRODUCTION

  Talkaround is intended to provide local area communications in situations where network cover- age is not available. An existing talkaround user roaming out of the network may interfere with other digital SMRs causing dropped calls, poor call quality and excessive handoffs.

IMPLEMENTATION

The smart talkaround algorithm prevents inter- ference by first scanning for the presence of a

digital carrier on the pre-programmed talkaround channel. If there was no digital channel activity then the unit is inherently allowed to transmit on the pre-programmed talkaround channel.

However, if digital activity was detected, the subscriber unit interrogates the network and it gets a

download, over-the-air, of the preferred talkaround channel allocated by the carrier to prevent interfer- ence. This sequence of operation is shown in Figure 1. The subscriber unit will keep using the newly assigned talkaround frequency for as long as it can detect the presence of the digital system. As soon as the subscriber goes outside the range of the digital system then it automatically reverts to its preprogrammed talkaround channel.

I? Motorola. Inc. ,997 150 December 1997

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