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UNIT REGISTRATION PROCESS FOR SPECIFIED TALKGROUP ASSOCIATION IN A NETWORKED TRUNKING SYSTEM

IP.com Disclosure Number: IPCOM000006217D
Original Publication Date: 1991-Jul-01
Included in the Prior Art Database: 2001-Dec-14
Document File: 5 page(s) / 205K

Publishing Venue

Motorola

Related People

Michael D. Sasuta: AUTHOR

Abstract

Wide area communications on a tnmking system may be accomplished with a networking approach which connects multiple independent trunking sites, each with their own individual coverage contours, to form a greater coverage contour. To make efficient use of these combined communication resources, the current location of a target subscriber unit with regard to its present site association is necessary at the fixed end, such that only the pertinent communication resources of the site of current use by the subscriber unit need be assigned to this call, instead of blanketing the entire coverage area with communication resource allocations at all the sites for this call.

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MO7=OROLA INC. Technical Developments Volume 13 July 1991

UNIT REGISTRATION PROCESS FOR SPECIFIED TALKGROUP ASSOCIATION IN A NETWORKED TRUNKING SYSTEM

by Michael D. Sasuta

  Wide area communications on a tnmking system may be accomplished with a networking approach which connects multiple independent trunking sites, each with their own individual coverage contours, to form a greater coverage contour. To make efficient use of these combined communication resources, the current location of a target subscriber unit with regard to its present site association is necessary at the fixed end, such that only the pertinent communication resources of the site of current use by the subscriber unit need be assigned to this call, instead of blanketing the entire coverage area with communication resource allocations at all the sites for this call.

  When the subscriber population is configured into logical common groupings (e.g. talkgroups), there is an added dimension to the allocation of communica- tion resources across this large coverage area. In this case, the fixed end resource controller must determine which sites have active subscriber population affiliated with the talkgroup of the active call. Only these sites need to allocate communication resources to satisfy this talkgroup call.

  The fixed end normally receives the talkgroup affiliation from the subscriber unit when the unit makes its site presence known to the fixed end. This information is maintained and used for further resource allocation determinations. If this database

becomes corrupt without a faithful backup image available, the fixed end must reconstruct it from infor- mation gleened from the subscriber population at large. It is not advantageous to allow all the sub- scriber population to indicate its current talkgroup affiliations upon the sites, since this would tend to momentarily overload the system control channel resource. Until the database is suitably reconstructed, the fixed end resorts to a brute force "all" site approach for the talkgroup calls.

The fixed end may be capable of processing the talkgroup call operations on a more efficient basis,

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without requiring the reconstruction of "all" the possi- ble subscriber units associated with any one talkgroup. This is accomplished by allowing the fixed end to issue broadcast queries of, the subscriber population on all sites of the system, addressing "only" that subset of the subscriber population which is currently associated with a particular talkgroup. The talkgroup of interest will be determined by immediate need (e.g. a talk- group call request has been received) or as a matter of the systematic talkgroup database reconstruction pro- cess. Units currently associated with the indicated talkgroup will attempt to inform the fixed end of the condition. This of itself may produce overload impulse loading of the control channel upon certain sites, but the fixed end can terminate the update pro- cess from the affected su...