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A METHOD FOR DIRECTIONAL ANTENNA SELECTION USING THE INFLEXION PROTOCOL

IP.com Disclosure Number: IPCOM000008316D
Original Publication Date: 1997-Sep-01
Included in the Prior Art Database: 2002-Jun-05
Document File: 2 page(s) / 84K

Publishing Venue

Motorola

Related People

Richard C. Bernhardt: AUTHOR [+2]

Abstract

It is proposed that multiple directional antennas at a base station site can be used in conjunction with the InFLEXionTM protocol for voice and data messaging so as to increase coverage and traffic capacity, thereby reducing system cost. A key aspect of this technique is the coordination of the protocol and beam selection with respect to subscriber units.

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MOTOROLA Technical Developments

A METHOD FOR DIRECTIONAL ANTENNA SELECTION USING THE lNFLEXIONTM PROTOCOL

by Richard C. Bernhardt and Thomas C. Hill

SUMMARY

  It is proposed that multiple directional antennas at a base station site can be used in conjunction with the InFLEXionTM protocol for voice and data messaging so as to increase coverage and traffic capacity, thereby reducing system cost. A key aspect of this technique is the coordination of the protocol and beam selection with respect to subscriber units.

IMPLEMENTATION

  Figure I shows a three-sector, four-beams-per- sector (30 degree half-power beamwidth) antenna system with one transmitter assigned to each sector. Each sector has an individual antenna panel. The operation of all sectors (A, B, and C) is identical. Each beam within a sector, is denoted as bl, b2, etc.

  The new aspect of this implementation is a method of antenna beam selection which is integrated with the InFLEXionTM-based cell selection method described below.

THE BEAM SELECTION METHOD

  The beam selection method (via the beam selection matrix) operates in conjunction with the protocol and controller as follows:

1. The system simulcasts a "Where Are You"

(WRU) message on all beams using the beam selection matrix as a signal combiner.

2. Each transmitter's "Color Code" is transmitted on a sector basis on all four beams in that sector during the simulcast transmission, assuring that the two-way subscriber unit will respond with the (nominally...