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UNIT-TO-UNIT CALL PROCESSING IN A DISTRIBUTED PROCESSOR NETWORKED TRUNKED COMMUNICATION SYSTEM

IP.com Disclosure Number: IPCOM000006881D
Original Publication Date: 1993-Jun-01
Included in the Prior Art Database: 2002-Feb-08
Document File: 3 page(s) / 160K

Publishing Venue

Motorola

Related People

John K. Hefferan: AUTHOR [+3]

Abstract

This concerns the operation of the unit-to-unit call in the multiple site, distributed processing environment. In particular it is concerned with the determination of the necessary sites for the initiation of the call between the initiating and the target radio units, and a method to address this when the target unit's current location is not known with certainty by the Fixed Network Equip- ment (FIVE). If the FNE always knew the current loca- tion in the network of all the subscriber units of the system, then it would be a relatively simple matter to determine what site call resources need to be involved in this call; it would simply be the appropriate call resources at the current sites associated with the initiat- ing and target units.

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MO7VROLA INC. Technical Developments Volume 19 June 1993

UNIFTO-UNIT CALL PROCESSING IN A DISTRIBUTED PROCESSOR NElWORKED TRUNKED COMMUNICATION SYSTEM

by John K. Hefferan, Todd A. Leigh and Michael D. Sasuta

  This concerns the operation of the unit-to-unit call in the multiple site, distributed processing environment. In particular it is concerned with the determination of the necessary sites for the initiation of the call between the initiating and the target radio units, and a method to address this when the target unit's current location is not known with certainty by the Fixed Network Equip- ment (FIVE). If the FNE always knew the current loca- tion in the network of all the subscriber units of the system, then it would be a relatively simple matter to determine what site call resources need to be involved in this call; it would simply be the appropriate call resources at the current sites associated with the initiat- ing and target units.

  This however is not the case for all subscriber units allowed to traverse the network of sites comprising a multiple site communication system. There is a set of the subscriber population with the ability to use the resources at multiple sites of the network and yet not explicitly indicate their current location in the network at any given time. To satisfy the unit-to-unit calls addressed to units of this type, it is necessary to determine the current site association for this unit, if any, without dis- turbing the normal operations of this site or other sites in the network, and then route the call to this site accordingly.

  A blanket unit-to-unit call to each of the potential sites of the network which the target unit may access is possible, and could guarantee that wherever this subscriber unit currently resides on the network, it will be involved in the call. However this is very wasteful of network resources for this call, since a unit-to-unit call will actually only require a maximum of two (2) unique sites of the network, while the target subscriber unit for this call may have a range of much more than two (2) sites of the network. This approach would severely impact the traffic capacity ofthe entire network.

  An improved method to address the subscriber pop- ulation which is not capable of network location indica- tion, has the FNE maintaining some record of the poten-

0 Motorola. 1°C. 1993

tial domain of network sites to which each of these subscriber units have access. This is the maximum set of sites which will ever need to be considered for a unit- to-unit call to this subscriber unit. (It also is the maxi- mum set of sites from which calls initiated by this subscriber unit may actually occur in the network.)

  Additionally the FNE needs to maintain some database element to indicate the last known site of pres- ence for each subscriber unit. The database element will track the activity associated with this particular subscriber unit as the unit moves across the network of sites. T...