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SEAMLESS ROAMING BETWEEN RADIO SITES FOR A HALF DUPLEX RADIO

IP.com Disclosure Number: IPCOM000006981D
Original Publication Date: 1993-Jun-01
Included in the Prior Art Database: 2002-Feb-14
Document File: 2 page(s) / 90K

Publishing Venue

Motorola

Related People

Kurt Stefans: AUTHOR [+2]

Abstract

Multi-site trunked radio systems that use half duplex radios can not change from one site to another (or even know when they need to change sites) when the subscriber radio is transmitting. This invention will ena- ble a trunking half duplex subscriber radio, traveling from site to site in a multi-site trunking radio system, to change site afIXation without loss of communications. Chang- ing site affiliation can include when the subscriber radio is transmitting or receiving. This invention uses a GPS (Global Positioning System) receiver and a portable corn- puter connected to a subscriber radio.

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MO7VROLA INC. Technical Developments Volume 19 June 1993

SEAMLESS ROAMING BETWEEN RADIO :SlTES FOR A HALF DUPLEX RADIO

by Kurt Stefans and Bill Felderman

ABSTRACT PROBLEM STATEMENT

  Multi-site trunked radio systems that use half duplex radios can not change from one site to another (or even know when they need to change sites) when the subscriber radio is transmitting. This invention will ena- ble a trunking half duplex subscriber radio, traveling from site to site in a multi-site trunking radio system, to change site afIXation without loss of communications. Chang- ing site affiliation can include when the subscriber radio is transmitting or receiving. This invention uses a GPS (Global Positioning System) receiver and a portable corn- puter connected to a subscriber radio.

  Given a half duplex radio in a multi-site trunked radio system. Currently when a subscriber radio roams from one site to another while it is transmitting, a call is lost when the radio roams out of its current site's range.

SOLUTION

A subscriber radio is connected to a GPS receiver and Processing Unit, see Figure 1.

r ---------- l

I Processing Subscriber 1 1 unit Radio I

I I

I I
.-------------

GPS receiver

Figure 1 0.2

GPS recceiver: receives position data and makes it avail- Position database: consists of the radio range limits of able to the Processing unit. each site in a system and each site's corresponding con- trol channel(s).

Processing unit (could be a laptop PC): holds the radio system's position database and determines when Subscriber radio: is a normal truoking radio connected the subscriber is reaching a site limit based on the posi- to the Processing unit. The subscriber radio has soft- tion data it receives from the GPS receiver. It then sends ware installed which allows it to perform the functions messages to the Subscriber radio instructing it...