Base Station And Method Of Assigning Frequencies To Pilot Sequences
First Claim
1. A frequency assignment method for assigning frequencies to UP link pilot signals in a radio communication system;
- comprising;
assigning a plurality of pilot sequences having different Peak to Average Power characteristics to each cell or each sector such that they can be used in said each cell or sector;
assigning a plurality of frequencies to each of said pilot sequences that are used for transmitting said pilot sequences by frequency multiplexing; and
making the correlation between each of said pilot sequences and said assigned frequencies in adjacent cells or sectors different.
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Accused Products
Abstract
A base station that assigns frequencies to UP link pilot signals in a radio communication system, where the base station stores the correlation between each of a plurality of pilot sequences having different Peak to Average Power characteristics and a plurality of frequencies that are used for transmitting the pilot sequence by frequency multiplexing, and makes the correlation between each of said pilot sequences and said assigned frequencies in adjacent cells or sectors different. Moreover, the base station measures the reception quality of signals received from a user terminal, makes reference to the stored correlation and finds a pilot sequence having Peak to Average Power characteristic that correspond to said reception quality, then sends an instruction to the user terminal so that the user terminal transmits the pilot sequence using the frequencies assigned to this pilot sequence.
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Citations
14 Claims
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1. A frequency assignment method for assigning frequencies to UP link pilot signals in a radio communication system;
- comprising;
assigning a plurality of pilot sequences having different Peak to Average Power characteristics to each cell or each sector such that they can be used in said each cell or sector; assigning a plurality of frequencies to each of said pilot sequences that are used for transmitting said pilot sequences by frequency multiplexing; and making the correlation between each of said pilot sequences and said assigned frequencies in adjacent cells or sectors different. - View Dependent Claims (2, 3, 4, 5)
- comprising;
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6. A frequency assignment method for assigning frequencies to UP link pilot signals in a radio communication system, comprising:
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separating pilot sequences of each cell or each sector into pilot sequences that can be used for channel estimation and pilot sequences that can be used for channel quality measurement; assigning a plurality of frequencies that are used for transmitting a pilot sequence for channel estimation by frequency multiplexing from a narrow frequency band at first frequency interval, and assigning a plurality of frequencies that are used for transmitting a pilot sequence for channel quality measurement by frequency multiplexing from a wide frequency band at second frequency interval; and making the correlation between each of said pilot sequences and said assigned frequencies in adjacent cells or sectors different. - View Dependent Claims (7, 8, 9)
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10. A base station that assigns frequencies to UP link pilot signals in a radio communication system, comprising:
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a memory unit that stores the correlation between each of a plurality of pilot sequences having different Peak to Average Power characteristics and a plurality of frequencies that are assigned for transmitting the pilot sequence by frequency multiplexing; a measurement unit that measures the reception quality of signals received from a user terminal; and an instruction unit that makes reference to said correlation and decides a pilot sequence having Peak to Average Power characteristic that corresponds to said reception quality as pilots, then sends an instruction to a user terminal so that the user terminal transmits the pilot sequence using the frequencies assigned to the pilot sequence;
wherein the base stationmakes the correlation between each of said pilot sequences and said assigned frequencies in adjacent cells or sectors different. - View Dependent Claims (11)
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12. A base station that assigns frequencies to UP link pilot signals in a radio communication system, comprising:
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a memory unit that stores the correlation between both pilot sequences for channel estimation and pilot sequences for channel quality measurement, and a plurality of frequencies that are used for transmitting each of the pilot sequences using frequency multiplexing; an instruction unit that makes reference to said correlation and decides a pilot sequence for channel quality measurement used when measuring the channel quality, and a pilot sequence for channel estimation used when performing channel estimation, then sends an instruction to a user terminal so that the user terminal transmits each of the pilot sequences using the frequencies assigned to the pilot sequence; a measurement unit that measures channel quality using the pilot sequence for channel quality measurement; a data transmission frequency decision unit that finds a frequency band having good channel quality, and decides the data transmission frequency for the user terminal; a channel estimation unit that performs channel estimation using the pilot sequence for channel estimation; and a frequency equalization unit that performs frequency equalization control based on the channel estimation results;
wherein the base stationassigns a plurality of frequencies, which are used for transmitting said pilot sequences for channel estimation by frequency multiplexing, from a narrow frequency band at first frequency interval; assigns a plurality of frequencies, which are used for transmitting said pilot sequences for channel quality calculation by frequency multiplexing, from a wide frequency band at second frequency interval; and makes the correlation between each of said pilot sequences and said assigned frequencies in adjacent cells or sectors different. - View Dependent Claims (13, 14)
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Specification