BASE STATION, RADIO COMMUNICATION SYSTEM AND PILOT PATTERN DECISION METHOD
First Claim
1. A base station in a radio communication system which uses pilot signals having a predetermined pattern during transmission from a user terminal to the base station, the base station comprising:
- a storage unit which stores a rank table on a peak to average power ratio of each pilot pattern;
a pilot pattern allocation unit which allocates pilot patterns to terminals in a sequence of better peak to average power ratio with reference to the rank table; and
a pilot pattern notification unit which notifies the allocated pilot pattern to the terminal.
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Accused Products
Abstract
In a radio communication system which uses pilot signals during transmission from a user terminal to a base station, the base station creates and stores a rank table on a peak to average power ratio of each pilot pattern, extracts a transmission power of the user terminal or a power difference between a maximum transmission power and the transmission power of the user terminal on the basis of a receive signal from the user terminal, and allocates a pilot pattern of which peak to average power ratio is good to a user terminal of which transmission power is great, or the power difference is small, with reference to the rank table.
Or a pilot pattern in a rank according to the transmission status (e.g. transmission power, distance from the base station) of the user terminal is adaptively allocated to the user terminal.
118 Citations
20 Claims
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1. A base station in a radio communication system which uses pilot signals having a predetermined pattern during transmission from a user terminal to the base station, the base station comprising:
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a storage unit which stores a rank table on a peak to average power ratio of each pilot pattern; a pilot pattern allocation unit which allocates pilot patterns to terminals in a sequence of better peak to average power ratio with reference to the rank table; and a pilot pattern notification unit which notifies the allocated pilot pattern to the terminal.
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2. A base station in a radio communication system which uses pilot signals having a predetermined pattern during transmission from a user terminal to the base station, comprising:
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a storage unit which stores a rank table on a peak to average power ratio of each pilot pattern; a transmission status identification unit which identifies transmission status of a user terminal; a pilot pattern allocation unit which adaptively allocates a pilot pattern having a rank according to the transmission status of the user terminal to the user terminal; and a pilot pattern notification unit which notifies the allocated pilot pattern to the terminal. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9)
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10. A radio communication system which uses pilot signals having a predetermined pattern during transmission from a user terminal to a base station, wherein the base station comprises:
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a storage unit which stores a rank table on a peak to average power ratio of each pilot pattern for each purpose of use; a pilot pattern allocation unit which allocates the pilot pattern according to the intended use to the user terminal respectively, with reference to the rank table; and a pilot pattern notification unit which notifies the pilot patterns according to the purposes of use to the user terminal respectively, and the user terminal comprises; a storage unit which stores the pilot patterns according to the purposes of use respectively; a pilot generation unit which generates a pilot pattern according to the purpose of use; and a transmission unit which sends the pilot pattern. - View Dependent Claims (11, 12, 13)
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14. A method of deciding a pilot pattern for pilot signals in a radio communication system which uses the pilot signals during transmission from a user terminal to a base station, the method comprising the steps of:
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creating a rank table on a peak to average power ratio of each pilot pattern; identifying data transmission status of a user terminal; and adaptively allocating a pilot pattern in a rank according to the data transmission status of the user terminal, to the user terminal. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification