US 2026/0280663 A1Published application

Method and Apparatus for Improving Land MobileRadio (LMR) Base Site Coverage Using Sectorized Antenna

AssigneeMotorola Solutions, Inc.

InventorsDENNIS DREES, DAVID P GURNEY, KEVIN DOBERSTEIN, GREGORY J BUCHWALD, JEFFREY F THURSTON

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Abstract

Land mobile Radio (LMR) system coverage and reliability levels are improved through the application of wide beamwidth sectorized antennas and various transmission/reception techniques. Simulcast transmission methods from a single LMR base site using the sectorized antennas improve outbound coverage and reliability levels. Sectorized antennas are also utilized in combination on the base station receiver side to improve inbound coverage and reliability levels. The net effect of these improvements is a significant reduction in the number of LMR sites needed to cover a given area, which in turn reduces LMR system deployment, maintenance and operational costs.

Claims18

Dependent claims

A method for implementing a land mobile radio (LMR) transmitter base site, comprising:

deploying a plurality of wide beamwidth sectorized antennas radially spaced to form overlapping regions of RF coverage around the LMR transmitter base site;
operating at least one transmitter function at the LMR transmitter base site;
generating, via the at least one transmitter function, one or more simulcast transmission signals, each simulcast transmission signal being configured with an independent launch time adjustment;
applying an independent dithering sequence to each of the one or more simulcast transmission signals as part of the transmit function;
and
transmitting each of the one or more simulcast transmission signals based on each independent launch time adjustment and each independent dithering sequence, with each simulcast transmission signal being transmitted over a respective wide beamwidth sectorized antenna of the plurality of wide beamwidth sectorized antennas associated with each overlapping region of RF coverage, thereby providing a simulcast LMR transmitter base site.

3 more elements

A land mobile radio (LMR) base site, comprising;

a transmitter;
a base site controller;
a wide beamwidth sectorized transmit antenna operatively coupled to the transmitter, the wide beamwidth sectorized transmit antenna being radially spaced relative to other sectorized antennas of the LMR base site, to form overlapping sectors of LMR RF coverage around the LMR base site;
and
the base site controller having a microprocessor configured to:
operate a transmitter function on the LMR transmitter during the transmit mode of operation;
generate, in response to the transmitter function, one or more simulcast transmission signals, each simulcast transmission signal being configured with an independent launch time adjustment for each sector of the overlapping sectors;
apply, as part of the transmit function, an independent dithering sequence to each of the one or more simulcast transmission signals;
transmit each of the one or more simulcast transmission signals based on each independent launch time adjustment and each independent dithering sequence, with each simulcast transmission signal being transmitted over the wide beamwidth sectorized antenna associated with each of the overlapping sectors of LMR RF coverage, thereby providing a portion of a simulcast LMR base site transmitter.

6 more elements

Dependencies are inferred from the claim text.