United States Patent 7,903,614
Pietraski March 8, 2011
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Method and apparatus for selecting link adaptation parameters for CDMA-based wireless communication systems
Abstract
A method and apparatus enhance the selection of transport block set size (TBSS), number of spreading codes, and modulation type, referred to collectively as transport format resource combination (TFRC), in a medium access control (MAC) layer for transmission of data in a code division multiple access (CDMA) wireless communication system, preferably a Universal Mobile Telecommunications Systems (UMTS) high speed downlink packet access (HSDPA) communication system. The maximum number of spreading codes available for transmission and the set of possible TFRCs are preferably determined based on a channel characteristics provided in part by a channel quality indicator (CQI). For each TBSS value in the set of possible TFRCs, a TFRC is selected with the largest number of spreading codes within the maximum number of spreading codes for which the corresponding coding rate is preferably at least 1/3. The corresponding code rate for each selected TFRCs is compared to a threshold to select a corresponding type of modulation. One of the selected TFRCs is selected to be provided to the PHY layer that best matches the CQI and preferably has a maximum TBSS.
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Inventors: Pietraski; Philip J. (Huntington Station, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 11/740,504
Filed: April 26, 2007
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Related U.S. Patent Documents
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Application Number Filing Date Patent Number Issue Date
60795300 Apr., 2006
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Current U.S. Class: 370/335 ; 370/328; 370/338; 370/468; 370/470; 370/477
Current International Class: H04B 7/216 (20060101)
Field of Search: 370/468,328,338,470 455/522,67.11,561
PPP
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