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IP.com Disclosure Number: IPCOM000007177D
Original Publication Date: 1994-Jun-01
Included in the Prior Art Database: 2002-Mar-04

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Related People

Gary Grube Bernie Olson


A feature called Ruthless Preemption is some- times used on trunked radio systems serving public safety organizations. Trunked radio systems have lim- ited number of channel resources and from time to time they may all be assigned to active communica- tions. During this time, new call requests become "blocked" since there are no channel resources avail- able to service their call request. Since some ofthese new call requests may be more important than the calls that are currently active, the Ruthless Preemp- tion mechanism allows an "emergency" call request to displace an existing call in progress. The trunking infrastructure signals radio units involved in a call that will be displaced, to return to the idle mode on the system control channel. Then the new unit and its group are assigned to that "free" channel to carry out their emergency communication.