Browse Prior Art Database

SCANNED TALKGROUP ACTIVITY NOTIFICATION

IP.com Disclosure Number: IPCOM000009654D
Original Publication Date: 2000-Jan-01
Included in the Prior Art Database: 2002-Sep-09
Document File: 2 page(s) / 96K

Publishing Venue

Motorola

Related People

Matt Bridle: AUTHOR

Abstract

Talkgroup scanning is a technique used in trunk- ed radio systems to allow users to listen for activity on multiple talkgroups. Operation of talkgroup scanning in Motorola Smartzone systems is described below.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 50% of the total text.

Page 1 of 2

0 M M-OLA Technical Developments

SCANNED TALKGROUP ACTIVITY NOTIFICATION

by Matt Bridle

INTRODUCTION

  Talkgroup scanning is a technique used in trunk- ed radio systems to allow users to listen for activity on multiple talkgroups. Operation of talkgroup scanning in Motorola Smartzone systems is described below.

  In normal talkgroup operation, a radio user selects the talkgroup that they wish to be a member of. The radio then sends an affiliation message to the infrastructure and the zone controller records the fact that there is a member of the selected talkgroup registered at that site. This allows the zone con- troller to determine which sites should be involved when a group call is set-up. When a group call is requested, the infrastructure sets up the call at each site at which there is at least one radio affiiated to the requested talkgroup.

  In Smartzone systems talkgroup scanning is implemented by the radio listening for group call set-up messages for multiple t&groups, not just its currently aftiliated talkgroup. The infrastructure has no knowledge of the talkgroups that a mobile may be scanning and therefore a call will only be set-up at a site if there is an affiliated member of a talk- group at that site.

  The disadvantage of this implementation of talk- group scanning is that a scanning mobile has no guarantee of receiving call activity for calls involv- ing the scanned talkgroups, since it has to rely on affiliated members of the scanned talkgroup being registered at the same site.

PROBLEM TO BE SOLVED

  An alternative implementation of talkgroup scanning is now described. Each radio is allowed to affiliate with multiple talkgroups, therefore when a radio fast registers on a system, it transmits over the air all the talkgroups it wishes to scan. The infra- structure therefore has knowledge of all the talk- groups a radio wishes to scan and calls are set-up for all the scanned talkgroups that are registered at a site. This solution has the advantage that a radio is guaranteed that calls involving any of the scanned talkgroups are set-up at a site.

  However, this...