United States Patent 7,660,612
Bultan , et al. February 9, 2010
Precise sleep timer using a low-cost and low-accuracy clock
Abstract
A wireless transmit/receive unit (WTRU) uses an oscillator providing accuracy for synchronized communications parameters in an active mode, and operates at reduced power during a discontinuous reception (DRX) mode. A real time clock (RTC) is used as the frequency standard during the reduced power operation, and a frequency adjustment is effected while the RTC is used as the frequency standard. By effecting the frequency adjustment, the RTC is able to be used as the frequency standard for substantial time periods, thereby reducing power consumption of the WTRU during the DRX mode.
Inventors: Bultan; Aykut (Bayside, NY), Haim; John W. (Baldwin, NY), Kazakevich; Leonid (Plainview, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 11/678,105
Filed: February 23, 2007
Related U.S. Patent Documents
Application Number Filing Date Patent Number Issue Date
11000285 Nov., 2004 7197341
60531762 Dec., 2003
Current U.S. Class: 455/574 ; 455/127.5; 455/147
Current International Class: H04B 1/38 (20060101)
Field of Search: 455/574,502,343.2,208,38.3,127,343.1,127.5,147,8,343.16 370/311,335 375/345,376 342/357
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