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:
Mar. 27, 2001
Filed:
Dec. 21, 1998
David M. Cooley, Upper Darby, PA (US);
Joseph J. DiGiovanni, Malvern, PA (US);
John D. Kaewell, Bensalem, PA (US);
Scott D. Kurtz, Mt. Laurel, NJ (US);
Mark A. Lemmo, Huntington Valley, PA (US);
Michael W. Regensburg, Marlton, NJ (US);
David Vessal, Narberth, PA (US);
Eric Johns, Phoenixville, PA (US);
InterDigital Technology Corporation, Wilmington, DE (US);
Abstract
A power-conserving time division multiple access (TDMA) radio telephone system is disclosed in which a cluster of subscriber stations, remote from a base station, employs a common pool of frequency-agile modems each of which digitally synthesizes, on a timeSlot-by-timeSlot basis, the different channel-identifying intermediate frequencies needed to support communications between several of the subscriber stations and the base station. Power conservation is facilitated inter alia by controlling the assignment of modems to calls, maintaining unassigned modems in a powered-down state and by controlling the number of calls using the same time slot. Delay in assigning a powered-down modem to a call is eliminated by making available to all modems the highest quality synchronization information obtained by any of the active modems.