Browse Prior Art Database

Enhancements to Simulcast Resource Voting

IP.com Disclosure Number: IPCOM000013177D
Original Publication Date: 2003-Jun-17
Included in the Prior Art Database: 2003-Jun-17
Document File: 2 page(s) / 32K

Publishing Venue

Motorola

Related People

Richard E. Britton: AUTHOR

Abstract

The current resource voting algorithm within a voting/simulcast subsystem assumes a customer wishes to sacrifice RF channel capacity rather than coverage. Note that a voting/simulcast subsystem is composed of multiple RF sites. Subscriber sourced information received by the RF sites is voted at a comparator to form the best copy of the signal. Information traveling to a subscriber is transmitted by all RF sites within the subsystem on the same RF frequency and synchronized to minimize interference, which is also known as simulcast operation. A method is needed which allows the customer more flexibility, particularly as voting/simulcast subsystems increase in size. A resource voting algorithm which includes assignment of RF site weights can address this problem.

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Enhancements to Simulcast Resource Voting

By Richard E. Britton

 
 

                   

The current resource voting algorithm within a voting/simulcast subsystem assumes a customer wishes to sacrifice RF channel capacity rather than coverage. Note that a voting/simulcast subsystem is composed of multiple RF sites. Subscriber sourced information received by the RF sites is voted at a comparator to form the best copy of the signal. Information traveling to a subscriber is transmitted by all RF sites within the subsystem on the same RF frequency and synchronized to minimize interference, which is also known as simulcast operation. A method is needed which allows the customer more flexibility, particularly as voting/simulcast subsystems increase in size. A resource voting algorithm which includes assignment of RF site weights can address this problem.

In the current algorithm, a single component failure will undergo analysis from two perspectives by the Site Controller software. The Site Controller serves as the decision point for resource analysis within the voting/simulcast subsystem. First, the Site Controller will determine if the RF channel to which the component failure is associated should transition to a failed state.  Second, the Site Controller will determine if the failure, coupled with any other failures at the same RF site, should result in the RF site transitioning to a failed state.  Priority will be given to retaining the RF site state.  That is, the Site Controller will fail the RF channel, and additional failures on other channels will generally result in more channels transitioning to a malfunctioned state.  Hence, the Site Controller maintains coverage by preferring to leave all RF sites in service while sacrificing capacity by reducing the number of usable RF channels. This behavior results in an increased opportunity for call busies within the subsystem since the amount of available RF channels has been reduced. There are

situations in which the customer would rather sacrifice coverage than busy calls. 

The proposed enhancement allows a customer to supply an integer value for each RF site in the voting/simulcast subsystem, which serves as a weighted value for the RF site.  The larger the value; the more critical the RF site is to maintain in the system.  The enhancement also allows the customer to specify a threshold value which will be used by the Site Controller to decide when a chann...