Browse Prior Art Database

TIMER-INDUCED FREQUENCY SCANNING FOR EFFICIENT RF DATA COVERAGE

IP.com Disclosure Number: IPCOM000008730D
Original Publication Date: 1998-Jun-01
Included in the Prior Art Database: 2002-Jul-08
Document File: 2 page(s) / 91K

Publishing Venue

Motorola

Related People

Terry Bale: AUTHOR [+3]

Abstract

In designing multi-channel RF data systems, terrain and other physical limitations sometimes require the use of a high power "hole-tilling" RF transmission site. Unfortunately, RF data radio modems sometimes lock on to the higher power transmitters, even when a lower (but acceptable) power transmitter is physically closer. The result is overuse of the high power channel, and corresponding underuse of the lower power channels. We present a way to prevent a mobile fleet from "camping out" on these high power channels.

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MOTOROLA Technical Developments

TIMER-INDUCED FREQUENCY SCANNING FOR EFFICIENT RF DATA COVERAGE

by Terry Bale, Michael J. Crowley and Ronald Gillis

ABSTRACT

  In designing multi-channel RF data systems, terrain and other physical limitations sometimes require the use of a high power "hole-tilling" RF transmission site. Unfortunately, RF data radio modems sometimes lock on to the higher power transmitters, even when a lower (but acceptable) power transmitter is physically closer. The result is overuse of the high power channel, and corresponding underuse of the lower power channels. We present a way to prevent a mobile fleet from "camping out" on these high power channels.

MOTIVATION

  While participating in a customer strategy meeting, it became evident that Motorola had no system solution to one of the customer's major issues- "provide user access in areas where there are coverage holes AND prevent devices from overpopulating a given transmitter site when trying to do so."

PROBLEM DESCRIPTION

  Motorola's RF data radio modems maintain a list of available channels (the "scan list"). The list is initially available through the modem's Radio Service Software (RSS) programming. List updates occur dynamically through "channel marker" messages. The RF modems use signal degradation or the detection of message non-delivery as triggers to search for another channel with better signal quality. Current scan list priorities do not inhibit selection of an (overpopulated) high power channel.

  Current load balancing techniques require that the channels be located at the same site. Load balancing system messages generate additional

bandwidth utilization, and put a computational burden on the FNE data controller.

SOLUTION

  We introduce a method to use a "hole filling" high power transmitter/channel for a limited time. A timer is as...