The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 5392331 B1

Date of Patent:

Feb. 21, 1995

Filed:

May. 31, 1994

Method and apparatus for performing a hand-off in a wireless

Applicant:

Inventors:

Stelios J Patsiokas, Plantation, FL (US);

Craig Wadin, Sunrise, FL (US);

Paul Marko, Ft. Lauderdale, FL (US);

Prathivadhi B Krishna, Boynton Beach, FL (US);

Assignee:

Motorola, Inc., Schaumburg, IL (US);

Attorney:

Breeden; R. Louis

Primary Examiner:

Curtis Kuntz

Assistant Examiner:

Michael B Chernoff

Int. Cl.

CPC ...

H04M / ; H04Q / ;

U.S. Cl.

CPC ...

379 63 ; 379 60 ; 379 59 ; 455 332 ;

Abstract

A method and apparatus in a digital wireless communication system (100) controls an inter-cell hand-off. First and second fixed units (102) receive a common synchronization signal from a controller (104), and a first wireless link is established between the first fixed unit and a portable unit (120) on a first frequency. The first wireless link is synchronized to the common synchronization signal, and frame synchronization is obtained between the fixed unit (102) and the portable unit (120) during establishment of the first wireless link. Frame synchronization is maintained only by maintaining bit synchronization while transmitting user data on the first frequency. A second wireless link is established between the second fixed unit (102) and the portable unit (120) on the first frequency if the first frequency is usable therebetween. The second wireless link is synchronized to the common synchronization signal. The first wireless link is disconnected after the second wireless link is established, thereby seamlessly completing the inter-cell hand-off.

Find Patent Forward Citations

Patsiokas, Stelios. (1995). Method and apparatus for performing a hand-off in a wireless (U.S. Patent No. 5392331). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5392331

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