Browse Prior Art Database

AUTOMATIC INCLUSION OF A RADIQ IN AN EMERGENCY GROUP CALL

IP.com Disclosure Number: IPCOM000007049D
Original Publication Date: 1993-Oct-01
Included in the Prior Art Database: 2002-Feb-21
Document File: 3 page(s) / 155K

Publishing Venue

Motorola

Related People

David J. Ness-Cohn: AUTHOR

Abstract

This problem frequently arises because Radios that are required to be irt communication during an emergency 1) are ahiliated to different Talkgroups, 2) have disjoint sets of programmed Talkgroups, or 3) have Priority Scan Lists that do not cover the union ofTalkgroups for that set ofRadios.

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Page 1 of 3

MOlOROLA INC. Technical Developments Volume 20

October 1993

AUTOMATIC INCLUSION OF A RADIQ

IN AN EMERGENCY GROUP CALL ;

by David J. Ness-Cohn

List. This problem frequently arises because Radios that are required to be irt communication during an emergency 1) are ahiliated to different Talkgroups,
2) have disjoint sets of programmed Talkgroups, or
3) have Priority Scan Lists that do not cover the union ofTalkgroups for that set ofRadios.

ABSTRACT

METHOD DESCRIPTION !'

  A method is described that allows a Radio that is required to be included in an Emergency Group Call to be automatically included in that call regard- less of which Talkgroup the Radio issuing the Emer- gency Alarm (EA) finds itself affiliated. An Emer- gency Alarm consists of the EA Radio ID and the EA Talkgroup ID. When a Radio issues an Emer- gency Alarm, the receiving Radio temporarily places the EA Talkgroup ID into the Priority Scan List. The Priority Scan feature is then used to pull the radios over into the EA voice channel whenever it is assigned. A Cancel Emergency Alarm, issued by the originating Radio or by a Dispatcher responsible for handling the emergency, is sent when there is no longer an emergency. The receiving Radios may then remove the EA Talkgroup ID from the Priority Scan List as long as no other Radio of interest has issued an Emergency Alarm for that Talkgroup. Several options can be used to filter the set of Emergency Alarms to which the receiving Radios will react.

  This method allows a Radio to be included in an Emergency Group Call even though the Radio 1) is not affiliated with the EA Talkgroup, 2) does not have direct access to the EA Talkgroup (can not manually select the Talkgroup), or 3) does not have the EA Talkgroup programmed into its Priorrity Scan

  Under normal conditions, Radios that are required to be in communication with each other in an emergency are independently afftliated with a diverse set of Talkgroupsl A Radio User in an emer- gency may press the Emergency Button on the Radio resulting in the issuance of an Emergency Alarm. An Emergency Alarm consists of the EA Radio ID and the EA Talkgroup ID.

  Other Radios receive the Emergency Alarm and determine whether an entry for the EA Radio ID exists in the Active Emergency Alarm Table (refer to Figure 1). If the entry does not exist, one is cre- ated. An entry includes :both the EA Radio ID and the EA Talkgroup ID. The EA Talkgroup ID is also temporarily added to the Priority Scan List if it is not already an entry. If a new entry is created, it is marked as Temporary to distinguish it from the per- manent members (refer to Figure 2).

126 0 Motorola, 1°C. 1993

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MO-LA INC. Technical Developments Volume 20 October 1993

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  Ifan entry for the EA Radio ID does exist in the Active Emergency Alarm Table and the new and old EA Talkgroup ID are the same, then no action is taken. However, if the PA Talkgroup IDS differ,...