Browse Prior Art Database

PROXIMATE PORTABLE CALL HANDOFF SYSTEM

IP.com Disclosure Number: IPCOM000005895D
Original Publication Date: 1990-Mar-01
Included in the Prior Art Database: 2001-Nov-14
Document File: 1 page(s) / 57K

Publishing Venue

Motorola

Related People

Doug Ayers: AUTHOR [+3]

Abstract

In a cellular or micro-cellular radio telephone system (such as an on-site cordless PBX), the traffic handling capaci- ty of the system is limited by the number of channels that are specifically allocated for use by the system. This scheme provides a means to increase the traffic capacity of the system by using radio channels approved for unlicensed use (see FCC Rules Part 15 for low power communications).

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 59% of the total text.

Page 1 of 1

0 M

MO7VROLA Technical Developments Volume 10 March 1990

PROXIMATE PORTABLE CALL HANDOFF SYSTEM

by Doug Ayers& Warren Glotzbach and Zaffer Merchant

   In a cellular or micro-cellular radio telephone system (such as an on-site cordless PBX), the traffic handling capaci- ty of the system is limited by the number of channels that are specifically allocated for use by the system. This scheme provides a means to increase the traffic capacity of the system by using radio channels approved for unlicensed use (see FCC Rules Part 15 for low power communications).

Calls that are placed between portable units that are in close proximity to each other or to a base station can be identified by the system via triangulation with directional antennas, signal strength measurement or a combination of both.

   For the portable to portable case, when it is determined that the portables are within close enough range of each other, a handoff procedure can be initiated that causes these portables to switch to low power operation and talk directly to each other using FCC unlicensed channels. The channels that would otherwise have been used for their communica- tions link are now free to service other traffic.

   When the portables are not close to each other to establish direct communication but one or both of the portables is close to a base station, a low power communications link using one of the unlicensed channels can be set up between that portable and the base only. This arrangement (as i...