United States Patent 7,898,948
DiGirolamo , et al. March 1, 2011
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Method and apparatus for sending a channel quality indication via a shared channel
Abstract
A method and apparatus for sending a channel quality indication (CQI) via a shared channel while a wireless transmit/receive unit (WTRU) is in a Cell_FACH state without having a dedicated channel allocated for the WTRU are disclosed. A WTRU performs a measurement of at least one parameter and generates a CQI based on the measurement. The WTRU then transmits the CQI via a random access channel (RACH). The CQI may be transmitted using an RACH preamble. A plurality of signature sequences may be divided into a plurality of groups. The WTRU may select one group based on the CQI and randomly select a signature sequence among signature sequences in the selected group for transmitting the RACH preamble. The CQI may be appended to the RACH preamble. The CQI may be transmitted via a control part or a data part of the RACH message.
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Inventors: DiGirolamo; Rocco (Laval, CA), Cave; Christopher R. (Verdun, CA), Marinier; Paul (Brossard, CA), Grandhi; Sudheer A. (Mamaroneck, NY), Roy; Vincent (Montreal, CA)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 11/877,553
Filed: October 23, 2007
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Related U.S. Patent Documents
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Application Number Filing Date Patent Number Issue Date
60862522 Oct., 2006
60888146 Feb., 2007
60908484 Mar., 2007
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Current U.S. Class: 370/230 ; 370/332; 370/437; 455/452.2
Current International Class: H04L 1/00 (20060101); H04W 72/02 (20090101); H04W 4/00 (20090101); H04J 3/16 (20060101)
Field of Search: 370/203-210,329-350,431-444,464-465 375/141-150,219-221,260,267,295 455/450,509
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