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IP.com Disclosure Number: IPCOM000006545D
Original Publication Date: 1992-Aug-01
Included in the Prior Art Database: 2002-Jan-14

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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.