Browse Prior Art Database

AUTOMATIC SCAN LIST MANAGEMENT FOR MULTIPLE SYSTEM APPLICATIONS

IP.com Disclosure Number: IPCOM000007207D
Original Publication Date: 1994-Jun-01
Included in the Prior Art Database: 2002-Mar-05
Document File: 2 page(s) / 104K

Publishing Venue

Motorola

Related People

Terry G. Ekstrom: AUTHOR [+3]

Abstract

Scan is a feature in the subscriber units which gives the user the ability to transparently monitor multiple communications systems. These commu- nications systems may comprise of conventional fre- quencies or trunking talkgroups. Automatic scan list management for multiple system applications will enhance the speed and efficiency ofthe scan feature.

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Technical Developments Volume 22 June 1994

AUTOMATIC SCAN LIST MANAGEMENT FOR MULTIPLE SYSTEM APPLICATIONS

by Terry G. Ekstrom, Richard Emch and Marc Naddell

OVERVIEW

  Scan is a feature in the subscriber units which gives the user the ability to transparently monitor multiple communications systems. These commu- nications systems may comprise of conventional fre- quencies or trunking talkgroups. Automatic scan list management for multiple system applications will enhance the speed and efficiency ofthe scan feature.

waste precious time searching frequencies which have no carrier. Time wasted on scanning for out-of-range systems translates directly as missed services on sys- tems within range to radio operators. The current multiple system scanning requires radio units to mon- itor system control channels in a round robin mode to acquire target traffic activity, The issue relating to this approach is the amount of time used in scan- ning for control channels with each independent sys- tem listed in the scan list. Since round robin scan- ning is not elhcient when systems may be out of range, missed services can result while the radio is implementing activity scans.

BACKGROUND

  A conventional system is one that involves a sin- gle frequency which the radio monitors for activity. The channel may have signaling that the subscriber unit must decode prior to unmuting it's audio.

  A trunking system supports the dispatch com- munications needs for mobile and portable radio users that are normally organized into groups called talkgroups. The radio must lock onto a control chan- nel and monitors this data channel for activity on it's scan talkgroups.

  Users now have the need to operate within a geographical area which may encompass multiple systems which may be either conventional or Trunked. The condition exists, whereby users may be located in system overlap areas, where a subset of the total systems stored in a specific scan list is in range and need to be scanned for activity. The remainder of these systems in the list would not be in range, yet would still be scanned frequently for activity. Scanning across multiple systems creates new challenges for scan operation,

CURRENT DRAWBACKS TO NUISANCE DELi3-E

  Experienc...