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DYNAMIC UPDATING OF SITE SELECTION CRITERIA IN A TRUNKED SYSTEM

IP.com Disclosure Number: IPCOM000007647D
Original Publication Date: 1996-May-01
Included in the Prior Art Database: 2002-Apr-11
Document File: 2 page(s) / 114K

Publishing Venue

Motorola

Related People

Andrew Fuehl: AUTHOR [+2]

Abstract

In a multiple site trunking system, radios routinely roam between sites. When a radio is in an overlap site coverage area, the radio chooses a site among the viable sites using programmed algorithms and factors such as signal strength, available site resources and a preprogrammed preferred site list. Site selection factors based on dynamically chang- ing system operation, overall system efficiency and optimization concerns are not currently considered by the radios. This is because this type of informa- tion is not currently available to the radios.

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MO7WROLA Technical Developments

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DYNAMIC UPDATING OF SITE SELECTION CRITERIA IN A TRUNKED SYSTEM

by Andrew Fuehl and Robert Plaza

BACKGROUND

  In a multiple site trunking system, radios routinely roam between sites. When a radio is in an overlap site coverage area, the radio chooses a site among the viable sites using programmed algorithms and factors such as signal strength, available site resources and a preprogrammed preferred site list. Site selection factors based on dynamically chang- ing system operation, overall system efficiency and optimization concerns are not currently considered by the radios. This is because this type of informa- tion is not currently available to the radios.

  There are several types of system performance, efftciency, and optimization issues that can be enhanced through the use of proper site selection by radios in overlap area situations.

1) In wide area trunking systems it is common for radios affiliated to a talkgroup to be located in many different sites. It is offen the case that a small number of radios may be afftliated in a par- ticular site while other adjacent sites have a larger number of radios. The sites that contain only a few of the radios are an efficiency drain on the system since those sites must be included in all calls within that talkgroup even though the sites support only a small percentage of the total radios. If all the radios in a particular site can be moved to other more densely populated sites, then that particular site is no longer needed when a call takes place in the talkgroup. The fewer number of sites required for a call increases system eIIi- ciency. By caremlly managing site selection of radios in overlap areas, it is possible to coerce radios to affiliate to more desirable sites and in so doing increase system efficiency.

2) A radio operator may choose to talk immediately at the expense of not transmitting on some sites where channels are not currently available. This is called a busy override. To enhance the practi-

cal usage of this feature, the system manager may institute a required site list so that in a busy over- ride situation, important sites are guaranteed to be included in all calls. In this case, it is beneti- cial to have as many radios as possible affiliated within the sites that are in the required site list. Doing this insures that more radios will be included in calls involving a busy override. By carefully managing site selection of radios in over- lap areas, it is possible to coerce radios into the required sites and doing so insures that a higher percentage ofradios will...