Radio Communication Apparatus, Base Station and System
First Claim
1. A radio communication apparatus for receiving an orthogonal frequency division multiplexing (OFDM) signal from a base station and transmitting a frequency hopping (FH) signal to the base station, using a plurality of sub-channels, the base station comparing a plurality of hopping pattern information items indicating hopping patterns from a plurality of radio communication apparatuses including the radio communication apparatus, and generating collision information when the hopping patterns include colliding hopping patterns, the apparatus comprising:
- an estimation unit configured to estimate a plurality of channel response values of the sub-channels based on the OFDM signal;
a selector which selects, from the sub-channels, several sub-channels which have higher channel response values than a value, each of the channel response values being expressed by a power level, a signal-to-noise power ratio, or a signal-to-interference ratio;
a determination unit configured to determine a hopping pattern from the selected sub-channels;
a transmitter which transmits, to the base station, a hopping pattern information item indicating the determined hopping pattern;
a receiver which receives the collision information from the base station; and
a correction unit configured to correct the hopping pattern based on the collision information.
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Accused Products
Abstract
Radio communication apparatus for receiving OFDM signal from base station and transmitting FH signal to base station, using sub-channels, base station comparing hopping pattern information items indicating hopping patterns from radio communication apparatuses including radio communication apparatus, and generating collision information when hopping patterns include colliding hopping patterns, includes estimation unit configured to estimate channel response values of sub-channels based on OFDM signal, selector which selects, from sub-channels, several sub-channels which have higher channel response values than a value, each of channel response values being expressed by power level, signal-to-noise power ratio, or signal-to-interference ratio, determination unit configured to determine hopping pattern from selected sub-channels, transmitter which transmits, to base station, hopping pattern information item indicating determined hopping pattern, receiver which receives collision information from base station, and correction unit configured to correct hopping pattern based on collision information.
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Citations
20 Claims
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1. A radio communication apparatus for receiving an orthogonal frequency division multiplexing (OFDM) signal from a base station and transmitting a frequency hopping (FH) signal to the base station, using a plurality of sub-channels, the base station comparing a plurality of hopping pattern information items indicating hopping patterns from a plurality of radio communication apparatuses including the radio communication apparatus, and generating collision information when the hopping patterns include colliding hopping patterns, the apparatus comprising:
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an estimation unit configured to estimate a plurality of channel response values of the sub-channels based on the OFDM signal; a selector which selects, from the sub-channels, several sub-channels which have higher channel response values than a value, each of the channel response values being expressed by a power level, a signal-to-noise power ratio, or a signal-to-interference ratio; a determination unit configured to determine a hopping pattern from the selected sub-channels; a transmitter which transmits, to the base station, a hopping pattern information item indicating the determined hopping pattern; a receiver which receives the collision information from the base station; and a correction unit configured to correct the hopping pattern based on the collision information. - View Dependent Claims (2)
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3. A radio communication system including a base station for transmitting an orthogonal frequency division multiplexing (OFDM) signal, and a plurality of radio communication apparatuses for receiving the OFDM signal from the base station and transmitting a frequency hopping (FH) signal to the base station, using a plurality of sub-channels, the system comprising:
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each of the radio communication apparatuses comprising; an estimation unit configured to estimate a plurality of channel response values of the sub-channels based on the OFDM signal; an acquisition unit configured to acquire a plurality of received signal levels for each of frequency bands from the estimated channel response values; a selector which selects, from the sub-channels, several sub-channels which have higher received signal levels than a value, each of the channel response values being expressed by a power level, a signal-to-noise power ratio, or a signal-to-interference ratio; a determination unit configured to determine a hopping pattern from the selected sub-channels; and a transmitter which transmits, to the base station, hopping pattern information indicating the determined hopping pattern, the base station comprising; a receiver which receives the hopping pattern information from each of the radio communication apparatuses; a generator which generates collision information when detecting colliding hopping patterns which exist between the radio communication apparatuses, by comparing a plurality of hopping pattern information items from the radio communication apparatuses; and a transmitter which transmits the collision information to each of the radio communication apparatuses, each of radio communication apparatuses further comprising; a receiver which receives the collision information from the base station; and a correction unit configured to correct the determined hopping pattern based on the collision information. - View Dependent Claims (4, 5, 6, 7)
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8. A radio communication apparatus for receiving an orthogonal frequency division multiplexing (OFDM) signal from a base station, and transmitting a frequency hopping (FH) signal to the base station, the apparatus comprising:
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a storing unit configured to store a plurality of hopping patterns which are suitable for use; a measuring unit configured to measure a received signal characteristic of each sub-carrier included in the OFDM signal; an acquiring unit configured to acquire, from the storing unit, one of the hopping patterns which uses a frequency band determined to be unused from the received signal characteristic; and a transmitter which transmits a signal in accordance with the acquired hopping pattern. - View Dependent Claims (9, 10, 11)
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12. A radio communication system including a base station for transmitting an orthogonal frequency division multiplexing (OFDM) signal, and a plurality of radio communication apparatuses for receiving the OFDM signal from the base station and transmitting a frequency hopping (FH) signal to the base station, the system comprising:
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each of the radio communication apparatuses comprising; a measuring unit configured to measure a received signal characteristic of each sub-carrier included in the OFDM signal; and a transmitter which transmits the measured received signal characteristic to the base station, the base station comprising; a receiver which receives the transmitted received signal characteristic from each of the radio communication apparatuses; a storing unit configured to store a plurality of hopping patterns which are suitable for use; an acquiring unit configured to acquire, from the storing unit, one of the hopping patterns which uses a frequency band determined to be unused from the received signal characteristic; and a transmitter which transmits, to each of the radio communication apparatuses, hopping pattern information indicating the acquired hopping pattern.
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13. A radio communication apparatus for receiving an orthogonal frequency division multiplexing (OFDM) signal from a base station, and transmitting a frequency hopping (FH) signal to the base station, the apparatus comprising:
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a measuring unit configured to measure a received signal characteristic of each sub-carrier included in the OFDM signal; a storing unit configured to store a plurality of hopping patterns which are suitable for use; an acquiring unit configured to acquire, from the storing unit, one of the hopping patterns which uses a frequency band determined to be unused from the received signal characteristic; and a transmitter which transmits, to another radio communication apparatus, a signal for requesting communication using the acquired hopping pattern. - View Dependent Claims (14)
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15. A radio communication apparatus for receiving an orthogonal frequency division multiplexing (OFDM) signal from a base station, and transmitting a frequency hopping (FH) signal to the base station, the apparatus comprising:
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a transmitter which transmits, to another radio communication apparatus, a request signal to request hopping pattern information indicating a hopping pattern used by said another radio communication apparatus; a receiver which receives the hopping pattern information from said another radio communication apparatus; a measuring unit configured to measure a received signal characteristic of each sub-carrier included in the OFDM signal; a storing unit configured to store a plurality of hopping patterns which are suitable for use; an acquiring unit configured to acquire, from the storing unit, a plurality of hopping patterns which uses a plurality of frequency bands determined to be unused from the received signal characteristic; and an informing unit configured to inform said another radio communication apparatus that communication is performed using a common hopping pattern, if the common hopping pattern is determined to exist between the acquired hopping patterns and the hopping pattern information.
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16. A radio communication apparatus for receiving an orthogonal frequency division multiplexing (OFDM) signal from a base station, and transmitting a frequency hopping (FH) signal to the base station, the apparatus comprising:
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an estimation unit configured to estimate a maximum delay period of a delay wave contained in the OFDM signal; a determination unit configured to determine a hopping pattern to enlarge intervals between sub-channels in proportion to an inverse of the maximum delay period; and a transmitter which transmits data to the base station using the determined hopping pattern. - View Dependent Claims (17)
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18. A radio communication system including a base station for transmitting an orthogonal frequency division multiplexing (OFDM) signal, and a plurality of radio communication apparatuses for receiving the OFDM signal from the base station and transmitting a frequency hopping (FH) signal to the base station, using a plurality of sub-channels, the system comprising:
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each of the radio communication apparatuses comprising; an estimation unit configured to estimate a maximum delay period of a delay wave contained in the OFDM signal; a determination unit configured to determine a hopping pattern to enlarge intervals between the sub-channels in proportion to an inverse of the maximum delay period; and transmitter which transmits data to the base station using the hopping pattern, the base station comprising; a receiver which receives a signal transmitted from said each of the radio communication apparatuses using the hopping pattern; an estimation unit configured to estimate a plurality of channel response values based on the received signal; a calculator which calculates a plurality of weights for sub-carrier signals to be transmitted, based on the channel response values; and a multiplication unit configured to multiply the sub-carrier signals by corresponding weights. - View Dependent Claims (19, 20)
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Specification