United States Patent 7,492,722
Pietraski , et al. February 17, 2009
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Wireless communication method and apparatus for adaptively biasing channel quality indicators to maintain a desired block error rate
Abstract
A method and apparatus for adaptively biasing a channel quality indicator (CQI) used for setting a configuration of communication between a transmitter and a receiver in a wireless communication system. The receiver sends a CQI and positive acknowledgement (ACK)/negative acknowledgement (NACK) messages to the transmitter. The ACK/NACK messages indicate the absence or presence of error, respectively, in a transmitted data packet. The CQI is derived from the signal-to-interference ratio (SIR) and the ACK/NACK messages. The transmitter calculates the block error rate (BLER) of the transmitted data packets based upon the ACK/NACK messages sent from the receiver. The transmitter compares the BLER of the transmitted data packets to a target BLER and biases the CQI based on the comparison in order to achieve the target BLER.
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Inventors: Pietraski; Philip J. (Huntington Station, NY), Sternberg; Gregory S. (Great Neck, NY), Castor; Douglas R. (Norristown, PA)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 10/981,248
Filed: November 4, 2004
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Current U.S. Class: 370/252 ; 370/332
Current International Class: G06F 11/00 (20060101)
Field of Search: 370/252,332
