Browse Prior Art Database

METHOD FOR NON-EMERGENCY CALLS TO PREEMPT OTHER CALLS

IP.com Disclosure Number: IPCOM000006545D
Original Publication Date: 1992-Aug-01
Included in the Prior Art Database: 2002-Jan-14
Document File: 3 page(s) / 154K

Publishing Venue

Motorola

Related People

David Tran: AUTHOR

Abstract

In current trunked systems, preemption of chan- nels actively involved in other call activity is relatively inflexible and usually pertain only to emergency calls. Non-emergency calls generally do not have the capabil- ity to preempt channels. Also, regulation of which types of calls may be preempted, whether regular dispatch or interconnect calls, does not exist. Emergency Ruthless Preemption in Smartnet systems allow emergency calls to preempt other calls when no voice channel resources are available. However, no individual interconnect calls can be preempted and there is no regulation over the channel that gets preempted other than the channel being capable of supporting the call for the group. Multigroup Interrupt Mode in Smattnet systems allow multigroup calls to end the calls of the talkgroups that belong to the multigroup so that the multigroup call can proceed with essentially all members of the multigroup involved in the multigroup call. However, only talkgroups within the particular multigroup are affected and there is no assurance that a channel will be preempted for the multigroup call to proceed if the talkgroups within the multigroup are not active in calls. Shared Service Algo- rithm in Smartnet systems regulates how many inter- connect calls and how many dispatch calls can be active at a particular time of day. However, this algorithm does not regulate any preemption of interconnect or dispatch calls.

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MOTOROLA INC. Technical Developments Volume 16 August 1992

METHOD FOR NON-EMERGENCY CALLS TO PREEMPT OTHER CALLS

by David Tran

  In current trunked systems, preemption of chan- nels actively involved in other call activity is relatively inflexible and usually pertain only to emergency calls. Non-emergency calls generally do not have the capabil- ity to preempt channels. Also, regulation of which types of calls may be preempted, whether regular dispatch or interconnect calls, does not exist. Emergency Ruthless Preemption in Smartnet systems allow emergency calls to preempt other calls when no voice channel resources are available. However, no individual interconnect calls can be preempted and there is no regulation over the channel that gets preempted other than the channel being capable of supporting the call for the group. Multigroup Interrupt Mode in Smattnet systems allow multigroup calls to end the calls of the talkgroups that belong to the multigroup so that the multigroup call can proceed with essentially all members of the multigroup involved in the multigroup call. However, only talkgroups within the particular multigroup are affected and there is no assurance that a channel will be preempted for the multigroup call to proceed if the talkgroups within the multigroup are not active in calls. Shared Service Algo- rithm in Smartnet systems regulates how many inter- connect calls and how many dispatch calls can be active at a particular time of day. However, this algorithm does not regulate any preemption of interconnect or dispatch calls.

  The following method will enable the users of a tmnked system to designate which users and user groups have special privileges when requests for voice channels are made from those users and user groups. These priv- ileged users and user groups may preempt channels used by non-privileged users and user groups if no voice chan- nel resources are available to use. This method will also

allow the users of a trunked system to designate what call type is more important to a particular system. The system may be configured so that either interconnect or dispatch calls get preempted first when no voice chan- nel resources are available to be assigned for the request made by the privileged users or user groups. This new preemption method will enable users of trunked sys- tems to customize how they want the system to behave during periods when no voice channel resources are avail- able to be assigned for a voice channel request. Cus- tomers are allowed to tailor their systems to suit their communications needs.

  Figures 1-3 detail the method for allowing preemp- tion capability for calls other than emergency calls. Note that emergency calls may preempt other non-emergency calls when needed and emergency calls may not be preempted by any other call. The preemption method incorporates Priority Levels and a "Preempt Capable flag" for the talkgroup and individual subscriber records (see Fiie 2) and a "Int...