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DETECTION OF EMERGENCY DURING CONVENTIONAL SCAN

IP.com Disclosure Number: IPCOM000008081D
Original Publication Date: 1997-Mar-01
Included in the Prior Art Database: 2002-May-16
Document File: 1 page(s) / 61K

Publishing Venue

Motorola

Related People

Gary Hunsberger: AUTHOR

Abstract

While a radio is performing a scan of conven- tional radio channels, it is possible to miss emer- gency voice messages on the channels being scanned. This could happen because there does not happen to be activity on the emergency channel at the time it is scanned. The problem with this is that a radio user will not know that there is an emer- gency situation, and thus will not be able to assist in dealing with the emergency. With the characteristic that voice calls on a radio system tend to be short, it is possible that many voice calls with emergency information could be missed because the radio is scanning elsewhere or is locked on another channel.

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MOTOROLA Technical Developments

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DETECTION OF EMERGENCY DURING CONVENTIONAL SCAN

by Gary Hunsberger

PROBLEM

  While a radio is performing a scan of conven- tional radio channels, it is possible to miss emer- gency voice messages on the channels being scanned. This could happen because there does not happen to be activity on the emergency channel at the time it is scanned. The problem with this is that a radio user will not know that there is an emer- gency situation, and thus will not be able to assist in dealing with the emergency. With the characteristic that voice calls on a radio system tend to be short, it is possible that many voice calls with emergency information could be missed because the radio is scanning elsewhere or is locked on another channel.

SOLUTION

  In order to indicate that an emergency is in progress when the radio channel is scanned, it is necessary to keep the outbound channel active even while the inbound channel is idle. This can be accomplished by having the radio infrastructure start an emergency hangtime that is initiated imme- diately following the acknowledge of an emergency alarm. At the completion of the emergency situa- tion, either the radio that initiated the emergency or

the console must then send a message inbound to the infrastructure to indicate that the emergency hangtime should end.

  During the emergency hangtime, information must be transmitted by the repeater which will keep the scanning radios locked on the channel. This c...