Wireless communication system for multi-hop connection, source station, radio station and pilot signal used therein

A source station performing signal transmission with at least one of a relay station and a destination station,

• the source station comprising:
• a pilot signal generation unit configured to generate a pilot signal including identification information and transmission power values of the source station;
• and
• a transmission unit configured to transmit the pilot signal by use of a power prescribed in the transmission power values.

A radio station performing signal transmission with at least one of a source station, a relay station and a destination station,

• the radio station comprising:
• a reception unit configured to receive a pilot signal;
• a required transmission power total calculation unit configured to specify a transmission path from the source station to the relay station by use of information included in the received pilot signal and calculate a total of required transmission power values of respective stations on the transmission path;
• a selection unit configured to select a transmission path having a minimum total of the required transmission power values among candidates of the specified transmission path;
• and
• a transmission unit configured to transmit a pilot signal including identification information about respective stations on the selected transmission path and required transmission power values thereof.

A wireless communication method for a multi-hop connection, which performs signal transmission between a source station, plurality of relay stations and a destination station,

• when receiving the pilot signal from the source station directly, the relay station
• measures a received SIR of the pilot signal,
• calculates a required transmission power value of the source station by use of at least one of a transmission power value of the source station, the measured received SIR and a desired received SIR,
• generates a pilot signal including identification information and the required transmission power values of the source station, and
• transmits the pilot signal by use of a power prescribed in the transmission power values of the relay station.

A wireless communication method for a multi-hop connection, which performs signal transmission between a source station, plurality of relay stations and a destination station,

• when receiving the pilot signal from the other relay station, the relay station
• measures a received SIR of the pilot signal,
• calculates a required transmission power value of the source station by use of at least a transmission power value of the source station,the measured received SIR and a desired received SIR,
• specifies a transmission path from the source station to the relay station by use of information included in the received pilot signal,
• calculates a total of required transmission power values of respective stations on the transmission path by use of required transmission power values included in a received pilot signal and the required transmission power value calculated for the pilot signal,
• selects a transmission path having a minimum total of the required transmission power values among candidates of the specified transmission path,
• generates a pilot signal including identification information and the required transmission power values of the source station, and
• transmits the pilot signal by use of a power prescribed in the transmission power values of the relay station.

A wireless communication method for a multi-hop connection, which performs signal transmission between a source station, plurality of relay stations and a destination station, the destination station

• measures a received SIR of the pilot signal,
• calculates a required transmission power value in an immediately preceding station, from which the pilot signal is transmitted, by use of a transmission power value of the immediately preceding station, at least one of the measured received SIR and a desired received SIR,
• specifies a transmission path from the source station to the destination station by use of information included in the received pilot signal,
• calculates a total of required transmission power values of respective stations on the transmission path by use of required transmission power values included in a received pilot signal and the required transmission power value calculated for the pilot signal,
• selects a transmission path having a minimum total of the required transmission power values among candidates of the specified transmission path,
• transmits a pilot signal including identification information about respective stations on the selected transmission path and required transmission power values thereof.