United States Patent 7,657,278
Koo , et al. February 2, 2010
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Method and apparatus for deriving a combined transmit power control command during handover
Abstract
A method and apparatus for deriving a combined transmit power control (TPC) command during handover are disclosed. During handover, a combined TPC command is generated from two or more TPC commands. The combined TPC command is set to -1 for decrease of the transmit power if a soft symbol of the TPC signal from any cell indicates decrease of the transmit power and the signal-to-interference ratio for the cell is greater than a reliability threshold. Otherwise, the combined TPC command is set to -1 if the function .gamma. is not greater than the combining threshold, and set to +1 if the function .gamma. is greater than the combining threshold, where the function .gamma. represents a log-likelihood ratio of a probability density function of the combined TPC command.
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Inventors: Koo; Chang-Soo (Melville, NY), Grieco; Donald M. (Manhassett, NY), Kwak; Jaeyoung (Morganville, NJ)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 11/234,629
Filed: September 23, 2005
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Related U.S. Patent Documents
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Application Number Filing Date Patent Number Issue Date
60702863 Jul., 2005
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Current U.S. Class: 455/522 ; 455/442; 455/69
Current International Class: H04W 52/24 (20060101); H04W 52/40 (20090101)
