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US 7,889,632 B2Granted
Radio communication system and radio communication method
AssigneeNtt Docomo, Inc.
InventorsKozue Hamamoto, Hitoshi Yoshino, Toru Otsu
Life of this patent
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Abstract
A radio communication system for carrying out communications between radio stations by modulating a plurality of signal sequences to be transmitted and received into at least one frequency channel assigned to each of a plurality of cells is formed by a channel mapping means for rearranging for each cell a plurality of frequency channels assigned with respect to each cell, and newly assigning particular frequency channels as a transmission and reception band of said signal sequences, and a bandwidth control means for controlling a bandwidth of said assigned frequency channel according to a propagation state of said assigned frequency channel.
Claims10
A radio communication system, comprising:
- a communication unit configured to carry out communications between radio stations by modulating a plurality of signal sequences to be transmitted and received into an initial assignment of a plurality of frequency channels assigned, respectively, to each of a plurality of cells;
- a channel mapping means for rearranging, for each of the plurality of cells, the initial assignment of the plurality of frequency channels into newly assigned continuous frequency channels;
- a bandwidth control means for controlling a bandwidth of said newly assigned continuous frequency channels according to a propagation state of said newly assigned continuous frequency channels;
- and
- means for orthogonally multiplexing the newly assigned continuous frequency channels, wherein
- said bandwidth control means converts information data sequences into a plurality of channels, and transmits and receives a signal sequence of each of these plurality of channels by a plurality of orthogonalized sub-carrier signals, and includes,
- a fading estimation means for estimating a propagation route of said sub-carrier signals, and
- a sub-carrier bandwidth control means for controlling a bandwidth of said sub-carrier signals to be transmitted and received, according to a fading information estimated by said fading estimation means.
5 more elements
A radio communication method executed by a radio communication apparatus, said method comprising:
- carrying out communications between radio stations and the radio communication apparatus by modulating a plurality of signal sequences to be transmitted and received into an initial assignment of a plurality of frequency channels assigned, respectively, to each of a plurality of cells;
- rearranging, at the radio communication apparatus, for each of the plurality of cells, the initial assignment of the plurality of frequency channels into newly assigned continuous frequency channels;
- controlling, at the radio communication apparatus, a bandwidth of said newly assigned continuous frequency channels according to a propagation state of said newly assigned continuous frequency channels;
- and
- orthogonally multiplexing the newly assigned continuous frequency channels, wherein said controlling includes,
- converting information data sequences into a plurality of channels,
- transmitting and receiving a signal sequence of each of these plurality of channels by a plurality of orthogonalized sub-carrier signals,
- estimating a propagation route of said sub-carrier signals, and
- controlling a bandwidth of said sub-carrier signals to be transmitted and received, according to estimated fading information.
6 more elements
A radio communication system, comprising:
- a communication unit configured to carry out communications between radio stations by modulating a plurality of signal sequences to be transmitted and received into an initial assignment of a plurality of frequency channels assigned, respectively, to each of a plurality of cells;
- a channel mapping unit configured to rearrange, for each of the plurality of cells, the initial assignment of the plurality of frequency channels into newly assigned continuous frequency channels;
- a bandwidth control unit configured to control a bandwidth of said newly assigned continuous frequency channels according to a propagation state of said newly assigned continuous frequency channels;
- and
- a converter configured to orthogonally multiplex the newly assigned continuous frequency channels, wherein
- said bandwidth control unit converts information data sequences into a plurality of channels, and transmits and receives a signal sequence of each of these plurality of channels by a plurality of orthogonalized sub-carrier signals, and includes,
- a fading estimation unit configured to estimate a propagation route of said sub-carrier signals, and
- a sub-carrier bandwidth control unit configured to control a bandwidth of said sub-carrier signals to be transmitted and received, according to a fading information estimated by said fading estimation unit.
5 more elements
Dependencies are inferred from the claim text.