Multiple access wireless communications system using a multisector configuration
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United States of America Patent
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Jun 17, 2008
Grant Date -
May 20, 2004
app pub date -
Aug 13, 2003
filing date -
Aug 26, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Power control methods and apparatus for use in a sectorized cell of an OFDM communications system are described. Each sector of a cell uses the same frequencies and transmission times and is synchronized with the other sectors in the cell in terms of tone frequencies used at any given time and symbol transmission times. Tones are allocated to channels in each cell in the same manner so that each channel in a sector has a corresponding channel in another sector. Power differences between channels in different sectors are maintained to be within a pre-selected power difference. Different channels in a cell are assigned different power levels. Wireless terminals are assigned to channels based on channel feedback information. Wireless terminals with poor channel conditions are allocated to higher power channels than wireless terminals with good channel conditions. Lower power channels often include more tones per symbol time than high power channels.
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