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.:
Date of Patent:
Sep. 15, 1998
Filed:
Jan. 02, 1996
Keith R Manssen, Long Grove, IL (US);
Robert K Krolopp, Riverwoods, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A method for locating variable control channels by a mobile station (104) in a radiotelephone system (100) permits the mobile station (104) to quickly find the location of unknown control channels. A locator beacon (300) is transmitted on one or more common locator channels from each base station (102) or from a locator transmitter which covers the entire region. The locator beacon (300) includes control channel location information which defines the location in the spectrum of a designated control channel. A mobile station (104), including a roaming mobile station outside its home service area, tunes to the locator channel and detects the locator beacon (300) to read the control channel location information. In response, the mobile station (104) tunes to the frequency of the designated control channel to receive a control signal from the base station (102). To prevent co-channel interference, the base stations of a radiotelephone system (100) time division duplex the broadcast of respective locator beacons.