United States Patent 7,764,957
Stern-Berkowitz , et al. July 27, 2010
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Method for performing measurements for handoff of a mobile unit operating with a switched beam antenna in a wireless communication system, and corresponding system
Abstract
Measurements for handoff are made by a wireless transmit/receive unit (WTRU) operating with a switched beam antenna in a wireless communication system. The switched beam antenna is a smart antenna generating a plurality of directional beams and an omni-directional beam. The WTRU measures signals from a plurality of cells with the omni-directional beam and/or one or more of the directional beams. The WTRU evaluates and reports to the network measurement of the omni-directional beam or the strongest beam for adding cells to an active set of cells. For removing cells from an active set of cells, the WTRU evaluates and reports to the network measurements of the antenna beam selected for communication with the active set cells.
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Inventors: Stern-Berkowitz; Janet (Little Neck, NY), Iacono; Ana Lucia (Garden City, NY), Zangi; Kambiz Casey (Durham, NC)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 11/742,775
Filed: May 1, 2007
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Related U.S. Patent Documents
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Application Number Filing Date Patent Number Issue Date
11051024 Feb., 2005 7295811
60541967 Feb., 2004
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Current U.S. Class: 455/422.1 ; 455/436; 455/525; 455/561; 455/67.11
Current International Class: H04B 17/00 (20060101); H04W 36/00 (20090101); H04B 7/00 (20060101)
Field of Search: 455/436-444,524-525,62-63.4,67.11,67.13,561-562.1 370/331-334
