Radio communication system
First Claim
1. A TDMA radio communication system using a multiple sub-carrier modulation method, said TDMA radio communication system comprising at least a first and a second radio station, wherein said second radio station selects only those sub-carriers capable of providing a transmission rate not less than a predetermined value in said first radio station, on the basis of the reception conditions of each sub-carrier of said first radio station, and modulates the selected sub-carriers using a modulation level or a coding rate in accordance with the reception conditions of said sub-carriers by controlling time-divided time slots of said TDMA on a sub-carrier level, so as to perform communication.
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Accused Products
Abstract
A TDMA radio communication system uses a multiple sub-carrier modulation method. The TDMA radio communication system comprises at least a first and a second radio station. The second radio station selects only those sub-carriers capable of providing a transmission rate not less than a predetermined value in the first radio station, on the basis of the reception conditions of each sub-carrier of said first radio station. The second radio station then modulates the selected sub-carriers using a modulation level or a coding rate in accordance with the reception conditions of the sub-carriers so as to perform communication, thereby obtaining a desired transmission rate while controlling interface to other stations.
43 Citations
25 Claims
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1. A TDMA radio communication system using a multiple sub-carrier modulation method, said TDMA radio communication system comprising at least a first and a second radio station, wherein
said second radio station selects only those sub-carriers capable of providing a transmission rate not less than a predetermined value in said first radio station, on the basis of the reception conditions of each sub-carrier of said first radio station, and modulates the selected sub-carriers using a modulation level or a coding rate in accordance with the reception conditions of said sub-carriers by controlling time-divided time slots of said TDMA on a sub-carrier level, so as to perform communication.
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2. A TDMA radio communication system using a multiple sub-carrier modulation method, said TDMA radio communication system comprising at least a first and a second radio station, wherein
said first radio station comprises: - sub-carrier electric power detecting means for detecting the reception power of each sub-carrier; and
notification means for notifying said second radio station of information on said reception power detected by said sub-carrier electric power detecting means, andsaid second radio station comprises;
determination means for determining whether a sub-carrier is capable of providing such a reception power as to enable communication at a transmission rate not less than a predetermined value in said first radio station, on the basis of the reception conditions of each sub-carrier sent from said first radio station; and
transmission sub-carriers selecting means for selecting only those sub-carriers determined to be capable of enabling communication by said determination means, wherein the sub-carriers selected by said transmission sub-carriers selecting means are modulated using a modulation level or a coding rate in accordance with the reception condition of the sub-carriers by controlling time-divided time slots of said TDMA on a sub-carrier level, in order to perform communication.
- sub-carrier electric power detecting means for detecting the reception power of each sub-carrier; and
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3. A TDMA radio communication system using a multiple sub-carrier modulation method, said TDMA radio communication system comprising at least one base station and a terminal station that share the same frequency to perform communication, wherein
said terminal station comprises: - notification means for notifying said base station of broadcast information on the reception power of sub-carriers, and
said base station comprises;
broadcast information detecting means for detecting said broadcast information;
sub-carrier electric power detecting means for detecting the reception power of each sub-carrier in accordance with said broadcast information;
determination means for determining whether a sub-carrier is capable of providing such a reception power as to enable communication at a transmission rate not less than a predetermined value in said terminal station, on the basis of the reception power detected by said sub-carrier electric power detecting means; and
transmission sub-carrier selecting means for selecting only those sub-carriers determined to be capable of enabling communication by said determination means, wherein each sub-carriers selected by said transmission sub-carrier selecting means are modulated using a modulation level or a coding rate in accordance with the reception power by controlling time-divided time slots of said TDMA on a sub-carrier level, in order to perform communication.
- notification means for notifying said base station of broadcast information on the reception power of sub-carriers, and
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4. A TDMA radio communication system using a multiple sub-carrier modulation method, said TDMA radio communication system comprising at least one base station and a terminal station, wherein
said base station selects only those sub-carriers capable of providing such a transmission rate not less than a predetermined value in said terminal station, on the basis of the reception conditions of each sub-carrier of said terminal station, and modulates the selected sub-carriers using a modulation level or a coding rate allotted in accordance with the reception conditions of the selected sub-carriers and the position of said terminal station with respect to said base station by controlling time-divided time slots of said TDMA on a sub-carrier level, so as to perform communication.
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5. A TDMA radio communication system using a multiple sub-carrier modulation method, said TDMA radio communication system comprising at least one base station and a terminal station, wherein
said terminal station comprises: - sub-carrier electric power detecting means for detecting the reception power of each sub-carrier; and
notification means for notifying said base station of information on said reception power detected by said sub-carrier electric power detecting means, andsaid base station comprises;
determination means for determining whether a sub-carrier is capable of providing such a reception power as to enable communication at a transmission rate not less than a predetermined value in said terminal station, on the basis of the reception conditions of each sub-carrier sent from said first terminal station;
allotment means for allotting a modulation level or a coding rate in accordance with said reception conditions and the position of said terminal station with respect to said base station, by controlling time-divided time slots of said TDMA on a sub-carrier level; and
transmission sub-carrier selecting means for selecting only those sub-carriers determined to be capable of enabling communication by said determination means, said sub-carriers being transmitted using a modulation level or a coding rate allotted by said allotment means.
- sub-carrier electric power detecting means for detecting the reception power of each sub-carrier; and
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6. A TDMA radio communication system using a multiple sub-carrier modulation method, said TDMA radio communication system comprising at least one base station and a terminal station that share the same frequency to perform communication, wherein
said base station selects only those sub-carriers capable of providing a transmission rate not less than a predetermined value in said terminal station, on the basis of the reception conditions of each sub-carrier of said terminal station, and modulates the selected sub-carriers using a modulation level or a coding rate allotted in accordance with the reception conditions of the selected sub-carriers and the position of said terminal station with respect to said base station, by controlling time-divided time slots of said TDMA on a sub-carrier level, so as to perform communication.
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7. A TDMA radio communication system using a multiple sub-carrier modulation method, said TDMA radio communication system comprising at least one base station and a terminal station that share the same frequency to perform communication, wherein
said terminal station comprises: - notification means for notifying said base station of broadcast information on the reception power of sub-carriers, and
said base station comprises;
broadcast information detecting means for detecting said broadcast information;
sub-carrier electric power detecting means for detecting the reception power of each sub-carrier in accordance with said broadcast information;
determination means for determining whether the sub-carrier is capable of providing such a reception power as to enable communication at a transmission rate not less than a predetermined value in said terminal station, on the basis of the reception power detected by said sub-carrier electric power detecting means;
allotment means for allotting a modulation level or a coding rate to each sub-carrier in accordance with said reception power and the position of said terminal station with respect to said base station, by controlling time-divided time slots of said TDMA on a sub-carrier level; and
transmission sub-carrier selecting means for selecting only those sub-carriers determined to be capable of enabling communication by said determination means, said sub-carriers being transmitted using a modulation level or a coding rate allotted by said allotment means.
- notification means for notifying said base station of broadcast information on the reception power of sub-carriers, and
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15. A TDMA radio communication system, wherein in the case where one of radio stations, such as a base station, for example, supports a plurality of transmission rates not less than the transmission rate of a terminal station that is set, said base station controls, by controlling time-divided time slots of said TDMA on a sub-carrier level, multiple transmission rates for individual sub-carriers in accordance with the reception conditions of each sub-carrier returned from said terminal station, using a greater number of types of modulation methods or coding rates not less than is set.
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16. A TDMA radio communication system, wherein a maximum transmission rate supported by a radio station and a desired reception power are transmitted from one communication device to another communication device by controlling time-divided time slots of said TDMA on a sub-carrier level.
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17. A second radio station suitable for a TDMA radio communication system using a multiple sub-carrier modulation method and comprising at least a first radio station and said second radio station, wherein
said second radio station, by controlling time-divided time slots of said TDMA on a sub-carrier level, selects only those sub-carriers capable of providing a transmission rate not less than a predetermined value in said first radio station, on the basis of the reception conditions of each sub-carrier of said first radio station, and modulates the selected sub-carriers using a modulation level or a coding rate in accordance with the reception conditions of the selected sub-carriers so as to perform communication.
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18. A first radio station suitable for a TDMA radio communication system using a multiple sub-carrier modulation method and comprising at least said first radio station and a second radio station, said first radio station comprising sub-carrier electric power detection means for detecting the reception power of each sub-carrier, and notification means for notifying said second radio station of information on said reception power detected by said sub-carrier electric power detecting means.
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19. A second radio station suitable for a TDMA radio communication system using a multiple sub-carrier modulation method and comprising at least a first radio station and said second radio station, said second radio comprising determination means for determining whether a sub-carrier is capable of providing such a reception power as to enable communication at a transmission rate not less than a predetermined value in said first radio station, on the basis of the reception conditions of each sub-carrier sent from said first terminal station, and transmission sub-carrier selecting means for selecting only those sub-carriers determined to be capable of enabling communication by said determination means, wherein the sub-carriers selected by said transmission sub-carrier selecting means are modulated using a modulation level or a coding rate in accordance with the reception conditions of said sub-carriers by controlling time-divided time slots of said TDMA on a sub-carrier level, in order to perform communication.
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20. A base station suitable for a TDMA radio communication system using a multiple sub-carrier modulation method and comprising at least one base station and a terminal station that share the same frequency to perform communication, wherein said base station comprises:
- sub-carrier electric power detecting means for detecting the reception power of each sub-carrier; and
determination means for determining whether a sub-carrier is capable of providing such a reception power as to enable communication at a transmission rate not less than a predetermined value in said terminal station, on the basis of the reception power detected by said sub-carrier electric power detecting means, wherein each sub-carrier selected by said transmission sub-carrier selecting means is modulated using a modulation level or a coding rate in accordance with the reception power of the sub-carrier by controlling time-divided time slots of said TDMA on a sub-carrier level, in order to perform communication.
- sub-carrier electric power detecting means for detecting the reception power of each sub-carrier; and
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21. A base station suitable for a TDMA radio communication system using a multiple sub-carrier modulation method and comprising at least one base station and a terminal station, wherein said base station selects only those sub-carriers capable of providing a transmission rate not less than a predetermined value in said terminal station, on the basis of the reception conditions of each sub-carrier of said terminal station, and modulates the selected sub-carriers using a modulation level or a coding rate allotted in accordance with the reception conditions of the selected sub-carriers and the position of said terminal station with respect to said base station by controlling time-divided time slots of said TDMA on a sub-carrier level, so as to perform communication.
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22. A terminal station suitable for a TDMA radio communication system using a multiple sub-carrier modulation method and comprising at least one base station and a terminal station, wherein said terminal station comprises sub-carrier electric power detecting means for detecting the reception power of each sub-carrier, and notification means for notifying said base station of information on said reception power detected by said sub-carrier electric power detecting means.
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23. A base station suitable for a TDMA radio communication system using a multiple sub-carrier modulation method and comprising at least one base station and a terminal station, wherein said base station comprises:
- determination means for determining whether a sub-carrier is capable of providing such a reception power as to enable communication at a transmission rate not less than a predetermined value in said terminal station, on the basis of the reception conditions of each sub-carrier sent from said terminal station;
allotment means for allotting a modulation level or a coding rate in accordance with said reception conditions and the position of said terminal station with respect to said base station by controlling time-divided time slots of said TDMA on a sub-carrier level; and
transmission sub-carrier selecting means for selecting only those sub-carriers determined to be capable of enabling communication by said determination means, said sub-carriers being transmitted using a modulation level or a coding rate allotted by said allotment means.
- determination means for determining whether a sub-carrier is capable of providing such a reception power as to enable communication at a transmission rate not less than a predetermined value in said terminal station, on the basis of the reception conditions of each sub-carrier sent from said terminal station;
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24. A base station suitable for a TDMA radio communication system using a multiple sub-carrier modulation method and comprising at least one base station and a terminal station that share the same frequency to perform communication, wherein said base station selects, by controlling time-divided time slots of said TDMA on a sub-carrier level, only those sub-carriers capable of providing a transmission rate not less than a predetermined value in said terminal station, on the basis of the reception conditions of each sub-carrier of said terminal station, and modulates the selected sub-carriers using a modulation level or a coding rate allotted in accordance with the reception conditions of the selected sub-carriers and the position of said terminal station with respect to said base station so as to perform communication.
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25. A base station suitable for a TDMA radio communication system using a multiple sub-carrier modulation method and comprising at least one base station and a terminal station that share the same frequency to perform communication, wherein said base station comprises:
- sub-carrier electric power detecting means for detecting the reception power of each sub-carrier;
determination means for determining whether a sub-carrier is capable of providing such a reception power as to enable communication at a transmission rate not less than a predetermined value in said terminal station, on the basis of the reception power detected by said sub-carrier electric power detecting means;
allotment means for allotting, by controlling time-divided time slots of said TDMA on a sub-carrier level, a modulation level or a coding rate to each sub-carrier in accordance with said reception power and the position of said terminal station with respect to said base station; and
transmission sub-carrier selecting means for selecting only those sub-carriers determined to be capable of enabling communication by said determination means, said sub-carriers being transmitted using a modulation level or a coding rate allotted by said allotment means.
- sub-carrier electric power detecting means for detecting the reception power of each sub-carrier;
Specification