Communication System
AssigneeFujitsu Limited
InventorMichael John HART
Life of this patent
Estimating the term…
Abstract
The present application relates to a wireless communication system and related methods and apparatuses for transmitting a signal from a source apparatus to a destination apparatus, via at least one intermediate apparatus. In particular, the present invention relates to techniques which seek to improve the throughput of data in multi-hop communication systems.
Claims8
A radio communication system including a mobile station, a relay station, and a base station, wherein the mobile station transmits radio signals to the relay station and the relay station relays the radio signals to the base station, the communication system comprising
- a first reception quality measuring unit configured to measure first reception quality for a radio signal transmitted from the mobile station to the relay station;
- a second reception quality measuring unit configured to measure second reception quality for a radio signal transmitted from the relay station to the base station;
- a receiver configured to receive the first reception quality transmitted from the relay station to the base station to collect the first reception quality and the second reception quality by the base station;
- a first controller configure to generate a first power control message and a second power control message taking the collected first and the second reception quality into account and tending to bring the first and the second reception quality into balance, by the base station as a centralized power control means for a total transmits power management along a relay transmission path;
- a first transmitter configured to transmit the first power control message and the second power control message to the relay station from the base station;
- a second controller configured to control transmission power of radio signals to be transmitted from the relay station to the base station based on the first power control message;
- a second transmitter configured to transmit the second power control message to the mobile station to relay the second power control message;
- and
- a third controller configured to control transmission power of radio signals to be transmitted from the mobile station to the relay station based on the second power control message.
A communication method for a radio communication system including a mobile station, a relay station, and a base station, wherein the mobile station transmits radio signals to the relay station and the relay station relays the radio signals to the base station, the communication method comprising:
- measuring first reception quality for a radio signal transmitted from the mobile station to the relay station;
- measuring second reception quality for a radio signal transmitted from the relay station to the base station;
- receiving the first reception quality transmitted from the relay station to the base station to collect the first reception quality and a second reception quality by the base station;
- generating a first power control message and a second power control message taking the collected first and the second reception quality into account and tending to bring the first and the second reception quality into balance, by the base station centralized power control means for a total transmission power management along a relay transmission path;
- transmitting the first power control message and the second power control message to the relay station from the base station;
- controlling transmission power of radio signals to be transmitted from the relay station to the base station based on the first power control message;
- transmitting the second power Control message to the mobile station to relay the second power control message;
- and
- controlling transmission power of radio signals to be transmitted from the mobile station to the relay station based on the second power control message.
A relay station which relays radio signals received from a mobile station to a base station, the relay station comprising;
- a reception quality measuring unit configured to measure first reception quality for a radio signal transmitted from the mobile station to the relay station;
- a transmitter configured to transmit the first reception quality to the base station;
- a receiver configured to receive a first message and second message which are generated by the base station taking the first reception quality and a second reception quality which is measured for a radio signal transmitted from the relay station to the base station into account by the base station as a centralized power control means for a total transmission power management along a relay transmission path;
- and
- a controller configured to control transmission power of radio signals to be transmitted from the relay station to the base station based on the first message and tending to bring the first and the second reception quality into balance, and relay the second message to the mobile station for transmission power control of radio signals to be transmitted to the mobile station to the relay station.
A base station used in a communication system including a mobile station and a relay station which relays radio signals received from the mobile station to the base station, the base station comprising:
- a receiver configured to receive first reception quality of a radio signal which is measured for a radio signal transmitted from the mobile station to the relay station;
- and
- a reception quality measuring unit configured to measure second reception quality for a radio signal transmitted from the relay station to the base station,
- wherein said base station collects the first reception quality and the second reception quality,
- said base station further comprising
- a controller configured to generate a first message and a second message taking the collected first and the second reception quality into account and tending to bring the first and the second reception quality into balance, by the base station as a centralized power control cans for a total transmission power management along a relay transmission path;
- and
- a transmitter configured to transmit the first message and the second message to the relay station, wherein the first message is used for transmission power control of a transmission signal to be transmitted from the relay station to the base station and the second message is relayed to the mobile station by the relay station for transmission power control of a transmission signal to be transmitted from the mobile station to the relay station.
Dependencies are inferred from the claim text.