IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0884325
(2010-09-17)
|
등록번호 |
US-RE44143
(2013-04-09)
|
우선권정보 |
JP-6-137621 (1994-06-20) |
발명자
/ 주소 |
- Serizawa, Mutsumu
- Nakajima, Nobuyasu
- Ogura, Koji
- Namekata, Minoru
- Wakutsu, Takashi
- Mukai, Manabu
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
56 |
초록
▼
A large amount of user information is transmitted with good efficiency by means of a high-speed downlink by making transmission rates of an uplink circuit and a downlink asymmetrical. The radio communication system includes a plurality of base stations, a plurality of terminals, an uplink establishe
A large amount of user information is transmitted with good efficiency by means of a high-speed downlink by making transmission rates of an uplink circuit and a downlink asymmetrical. The radio communication system includes a plurality of base stations, a plurality of terminals, an uplink established between each of the base stations and each of the terminals for the purpose of radio transmission of prescribed information from a terminal to a base station, and a downlink circuit established between each of the terminals and each of the base station for the purpose of radio transmission of prescribed data from a base station to a terminal. This radio communication system has a low-speed transmitting means, provided at the terminal, which transmits a radio signal at a relatively low transmission rate to an above-noted base station via the above-noted uplink, a low-speed receiving means, provided at the base station, which receives a radio signal sent at a relatively low transmission rate from the terminal via the uplink, a high-speed transmitting means, provided at the base station, which transmits a radio signal at a relatively high transmission rate to an above-noted terminal via the above-noted downlink, and a high-speed receiving means, provided at the terminal, which receives a radio sent at a relatively high transmission rate from the base station via the downlink.
대표청구항
▼
1. A radio communication system including at least one base station, and a plurality of terminals, said radio communication system comprising: an uplink which performs radio transmission of data at a first transmission rate;a low-speed down link which performs radio transmission of the data at a fir
1. A radio communication system including at least one base station, and a plurality of terminals, said radio communication system comprising: an uplink which performs radio transmission of data at a first transmission rate;a low-speed down link which performs radio transmission of the data at a first transmission rate;a high-speed downlink which performs radio transmission of the data at a second transmission rate which is higher than the first transmission rate;a first low-speed transmitter, provided at said terminal, which transmits a first radio signal at the first transmission rate to said base station via said uplink;a first low-speed receiver, provided at the base station, which receives the first radio signal, which sent at the first transmission rate, from said terminal via said uplink;a high-speed transmitter, provided at said base station, which transmits a second radio signal at the second transmission rate to said terminal via said high-speed downlink;a high-speed receiver, provided at said terminal, which receives the second radio signal at the second transmission rate from said base station via said high-speed downlink;a second low-speed transmitter, provided at said base station, which transmits a third radio signal at the first transmission rate to said terminal via said low-speed downlink; anda second low-speed receiver, provided at said terminal, which receives the third radio signal at the first transmission rate from said base station via said low-speed downlink;wherein said uplink and said low-speed downlink establish radio transmission at a first frequency, and said high-speed down link establishes radio transmission at a second frequency which is higher than said first frequency. 2. A radio terminal for a radio communication with a base station, comprising: a radio terminal transmitter (RTT) configured to perform a first radio communication with a base station receiver (BSR) of said base station, with the first radio communication having a first transmission rate and using a radio wave of a first frequency band; anda radio terminal receiver (RTR) configured to perform a second radio communication with a base station transmitter (BST) of said base station, with the second radio communication having a second transmission rate higher than the first transmission rate of the first radio communication and using a radio wave of a second frequency band which is higher than the first frequency band, whereina) the first radio communication and the second radio communication perform communications by Frequency Division Duplex (FDD) in which uplink and downlink transmissions use separated radio frequencies,b) in the second radio communication which corresponds to a downlink, user data are transmitted from the BST to the RTR, andc) the first radio communication corresponds to an uplink and is used for a transmission of re-transmission control information to control a re-transmission of the user data via the second radio communication. 3. A radio terminal for a radio communication according to claim 2, wherein a bandwidth of the first frequency band is equal to a bandwidth of the second frequency band. 4. A radio terminal for a radio communication according to claim 2, wherein a QAM modulated signal is transmitted from said base station. 5. A method of performing a radio communication of a radio terminal with a base station, comprising: transmitting a first radio communication from a radio terminal transmitter (RTT) of said radio terminal to a base station receiver (BSR) of said base station, with the first radio communication having a first transmission rate and using a radio wave of a first frequency band; andreceiving a second radio communication from a base station transmitter (BST) of said base station to a radio terminal receiver (RTR) of said radio terminal, with the second radio communication having a second transmission rate higher than the first transmission rate of the first radio communication and using a radio wave of a second frequency band which is higher than the first frequency band, whereina) the first radio communication and the second radio communication perform communications by Frequency Division Duplex (FDD) in which uplink and downlink transmissions use separated radio frequencies,b) in the second radio communication which corresponds to a downlink, user data are transmitted from the BST to the RTR, andc) the first radio communication corresponds to an uplink and is used for a transmission of re-transmission control information to control a re-transmission of the user data via the second radio communication. 6. A method of performing a radio communication of a radio terminal with a base station according to claim 5, wherein a bandwidth of the first frequency band is equal to a bandwidth of the second frequency band. 7. A method of performing a radio communication of a radio terminal with a base station according to claim 5, wherein a QAM modulated signal is transmitted from said base station.
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