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METHOD FOR CONTINUING CALLS ON MALFUNCTIONED CHANNELS IN A MULTI-SITE SYSTEM

IP.com Disclosure Number: IPCOM000006452D
Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2002-Jan-04
Document File: 3 page(s) / 145K

Publishing Venue

Motorola

Related People

Daniel J. McDonald: AUTHOR [+3]

Abstract

In wide area trunked communication systems, such as the Motorola AMSS or SmartZone systems, calls wiU be assigned at multiple sites and channels. When- ever a channel, that is currently supporting a call, mal- functions, it can no longer be guaranteed that this channel is still capable of supporting the call. It is probable that units that should be receiving the call on this malfunc- tioned channel are no longer participating in the call.

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MOTOROLA INC. Technical Developments Volume 15 May 1992

METHOD FOR CONTINUING CALLS ON MALFUNCTIONED CHANNELS IN A MULTI-SITE SYSTEM

by Daniel J. McDonald, Herbert R. Wolf and William A. Felderman

  In wide area trunked communication systems, such as the Motorola AMSS or SmartZone systems, calls wiU be assigned at multiple sites and channels. When- ever a channel, that is currently supporting a call, mal- functions, it can no longer be guaranteed that this channel is still capable of supporting the call. It is probable that units that should be receiving the call on this malfunc- tioned channel are no longer participating in the call.

  This publication describes a mechanism to continue the call such that units using the malfunctioned channel miss minimal parts of the conversation and so that the call is not ended prematurely. This is desirable since it allows units to hear transmissions even if a channel mal- functions and it eliminates the premature ending of calls. This invention only applies to systems, such as SmartZone, that employ the use of a programmable audio switch to allow the routing of audio from specific sources to specific destinations.

  When the fxed end determines that a channel has malfunctioned, and that channel is supporting a call, the tixed end will attempt to continue the call such that units using this channel only miss a small portion of the active

tioned channel if the fixed end determined that the trans- mit path was still useable for the channel. If the transmit path was not useable, the fvted end would pend the call at that site until a useable channel became available at that site to continue the call.

  In the case in which the malfunctioned channel con- tained the source of the call, the futed end would deter- mine the type of malfunction that has occurred. If the channel was no longer capable of receiving audio, the futed end would detertnine if another site can become the source of the call. If another site can become the source. of the call, the audio switch will be reprogrammed and the malfunctioned channel will be treated like a des- tination channel as stated above (i.e. a new channel would be found to replace the malfunctioned channel).

  If there is no other site that can become the audio source (i.e. no other units transmitting), the fvted end would end the call immediately since the current source on the malfunctioned channel is no longer capable of continuing the call due to the receiver being out of service.

  If the fixed end determined that the malfunction was due to the transmit path failing (and the receive path was still useable), the channel would continue to be used until the unit stopped transmit...