Radio communications system, and base station apparatus and mobile radio terminal apparatus employed in the system

Abstract

The present invention relates to a system conducting multi-carrier communications between a base station and a plurality of mobile terminals. When a transmission format of an individual information channel transmitted from the base station to the mobile terminals is output over a control channel from the base station to the mobile terminals, the transmission is conducted over the control channel of the same chunk as the chunk used in the individual information channel.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention, and together with the general description given above and the detailed description of the embodiments given below, serve to explain the principles of the invention.

FIG. 1 is an illustration for explanation of a relationship between subcarriers and chunks in an OFDM signal of a radio communications system according to the present invention;

FIG. 2 is an illustration for explanation of communications conducted between a base station and a mobile terminal in the radio communications system according to the present invention;

FIG. 3 is an illustration of a cellular system;

FIG. 4 is an illustration for explanation of communications conducted between a base station and a mobile terminal in the radio communications system according to the present invention;

FIG. 5 is a table of MCS numbers employed in the communications conducted between a base station and a mobile terminal in the radio communications system according to the present invention;

FIG. 6 is an illustration for explanation of a control channel and an individual information channel employed in transmission from the base station to the mobile terminal, in the radio communications system according to the present invention;

FIG. 7 is a block diagram showing a configuration of the mobile terminal in the radio communications system according to the present invention;

FIG. 8 is a block diagram showing a configuration of the base station in the radio communications system according to the present invention;

FIG. 9 is a table of OFDM numbers employed in the communications conducted between a base station and a mobile terminal in the radio communications system according to the present invention;

FIG. 10 is an illustration for explanation of a control channel and an individual information channel of information transmitted from the base station to the mobile terminal, in the radio communications system according to the present invention;

FIG. 11 is a table of MCS numbers employed in the communications conducted between the base station and the mobile terminal in the radio communications system according to the present invention;

FIG. 12 is an illustration for explanation of the control channel and the individual information channel of information transmitted from the base station to the mobile terminal, in the radio communications system according to the present invention;

FIG. 13 is an illustration for explanation of a chunk employed in the transmission from base station to the mobile terminal, in the radio communications system according to the present invention;

FIG. 14 is an illustration for explanation of a chunk employed in the transmission from base station to the mobile terminal, in the radio communications system according to the present invention;

FIG. 15 is an illustration for explanation of the control channel and the individual information channel of information transmitted from the base station to the mobile terminal, in the radio communications system according to the present invention; and

FIG. 16 is an illustration for explanation of the control channel and the individual information channel of information transmitted from the base station to the mobile terminal, in the radio communications system according to the present invention.

Claims

1. A radio communications system, conducting radio communications between a base station and a plurality of mobile stations, at least the radio communications from the base station to the mobile stations being conducted in a multi-carrier scheme, a transmission format of an individual information channel transmitted from the base station to the mobile stations being output over a control channel, the system being wherein the base station comprises:first transmission means for transmitting identification information to identify each of the mobile stations, and format information representing the transmission format of an individual information channel, in association with each other, over the control channel; andsecond transmission means for transmitting transmission information for the mobile station represented by the identification information, in a transmission format represented by the format information transmitted over the control channel by the first transmission means, over an individual information channel of a frequency band including the control channel transmitted by the first transmission means, andthat the mobile station comprises:first reception means for receiving the identification information and the format information over the control channel; andsecond reception means for, if the identification information received by the first reception means is to be transmitted to the own mobile station, receiving the individual information channel of the frequency band including the control channel, in the transmission format represented by the format information received by the first reception means together with the identification information.

2. The radio communications system according to claim 1, wherein the mobile station further comprises: measurement means for measuring a transmission path quality in accordance with a signal received from the base station; andthird transmission means for transmitting format information representing a transmission format determined in accordance with the measurement means,that the base station further comprises third reception means for receiving format information transmitted from the third transmission means, andthat the first transmission means transmits the identification information to identify the mobile station, and the formant information representing the transmission format of the individual information channel, in association with each other, over the control channel, in the transmission format based on the format information received by the third reception means.

3. The radio communications system according to claim 2, wherein the base station further comprises determination means for determining, in accordance with the format information received by the third reception means, determining a transmission format having a greater transmission efficiency than the transmission format represented by the format information, as the transmission format of the individual information channel, that the first transmission means transmits the identification information to identify the mobile station, and the formant information representing the transmission format of the individual information channel determined by the determination means, in association with each other, over the control channel, in the transmission format based on the format information received by the third reception means, andthat the first reception means receives the identification information and the formant information, over the control channel, in the transmission format based on the format information transmitted by the third transmission means.

4. The radio communications system according to claim 2, wherein the base station further comprises determination means for determining, in accordance with the format information received by the third reception means, determining a transmission format having a greater transmission efficiency than the transmission format represented by the format information, as the transmission format of the individual information channel, that the first transmission means transmits the identification information to identify the mobile station, in a preset transmission format, over the control channel, and transmits the formant information representing the transmission format of the individual information channel determined by the determination means, over the control channel, in the transmission format based on the format information received by the third reception means, andthat the first reception means receives the identification information to identify the mobile station, in a preset transmission format, over the control channel, and receives the formant information, over the control channel, in the transmission format based on the format information transmitted by the third transmission means.

5. The radio communications system according to claim 1, wherein the first transmission means transmits the identification information to identify the mobile station, in a preset transmission format, over a first control channel in a first frequency band, and transmits the formant information representing the transmission format of the individual information channel determined by the determination means, over a second control channel having a frequency band corresponding to the transmission frequency band of the first control channel, within a second frequency band broader than the first frequency band, that the second transmission means transmits the transmission information for the mobile station represented by the identification information, in the transmission format represented by the format information transmitted over the second control channel by the first transmission means, over an individual information channel of a frequency band including the second control channel,that the first reception means acquires the formant information representing the transmission format of the individual information channel by receiving the identification information over the first control channel, in the preset transmission format, and receiving the second control channel, in a band based on a frequency band receiving the first control channel, andthat if the identification information received by the first reception means is to be transmitted to the own mobile station, the second reception means receives the individual information channel of the frequency band of the second control channel, in the transmission format represented by the format information received by the first reception means together with the identification information.

6. A base station apparatus of a radio communications system, conducting multi-carrier radio communications with a plurality of mobile stations, and outputting a transmission format of an individual information channel transmitted to the mobile stations, over a control channel, the apparatus being comprising:first transmission means for transmitting identification information to identify each of the mobile stations, and format information representing the transmission format of an individual information channel, in association with each other, over the control channel; andsecond transmission means for transmitting transmission information for the mobile station represented by the identification information, in a transmission format represented by the format information transmitted over the control channel by the first transmission means, over an individual information channel of a frequency band including the control channel transmitted by the first transmission means.

7. A mobile radio terminal apparatus, receiving a multi-carrier radio signal from a base station, and being employed in a radio communications system outputting a transmission format of an individual information channel transmitted from the base station over a control channel included in a frequency band of the individual information channel, the apparatus being comprising:first reception means for receiving the identification information and the format information over the control channel; andsecond reception means for, if the identification information received by the first reception means is to be transmitted to the own apparatus, receiving the individual information channel of the frequency band including the control channel, in the transmission format represented by the format information received by the first reception means together with the identification information.