Communication Systems

A transmission method for use in a multi-hop wireless communication system comprising a base station, a relay station and mobile stations, said method comprising:

• transmitting using an uplink transmission frame that has a first zone for transmitting radio signals from a mobile station to the relay station, a second zone for transmitting radio signals from the relay station to the base station, and a third zone provided between the first zone and the second zone for transmitting radio signals from a mobile station to the base station.

A base station in a multi-hop wireless communication system comprising the base station, a relay station and mobile stations, wherein

• the base station may receive radio signals directly from a mobile station using a first zone within an uplink transmission frame which is also used for transmission from a mobile station to the relay station,
• the base station receives radio signals from the relay station using a second zone within the uplink transmission frame, and
• the base station may receive radio signals directly from a mobile station using a third zone provided between the first zone and the second zone, wherein the relay station switches from reception mode to transmission mode using the third zone.

A relay station in a multi-hop wireless communication system comprising a base station, the relay station and mobile stations, wherein

• the relay station receives radio signals from the base station using a first zone within a downlink transmission frame,
• the relay station transmits radio signals to a mobile station using a second zone within the downlink transmission frame,
• the base station transmits radio signals to a mobile station using a third zone provided between the first zone and the second zone, and the relay station switches from reception mode to transmission mode using the third zone.

A relay station in a multi-hop wireless communication system comprising a base station, the relay station and mobile stations, wherein

• the relay station receives radio signals from a mobile station using a first zone within an uplink transmission frame,
• the relay station transmits radio signals to the base station using a second zone within the uplink transmission frame,
• a mobile station transmits radio signals to the base station using a third zone provided between the first zone and the second zone, and the relay station switches from reception mode to transmission mode using the third zone.

A mobile station in a multi-hop wireless communication system comprising a base station, a relay station and mobile stations, wherein

• a mobile station may receive radio signals from the base station using a first zone within a downlink transmission frame which is also used for transmission from the base station to the relay station,
• the mobile station receives radio signals from the relay station using a second zone within the downlink transmission frame,
• a mobile station may receive radio signals from the base station using a third zone provided between the first zone and the second zone, wherein the relay station switches from reception mode to transmission mode using the third zone.

A mobile station in a multi-hop wireless communication system comprising a base station, a relay station and mobile stations, wherein

• the mobile station transmits radio signals to the relay station using a first zone within an uplink transmission frame,
• the relay station transmits radio signals to the base station using a second zone within the uplink transmission frame,
• a mobile station may transmit radio signals to the base station using a third zone provided between the first zone and the second zone, wherein the relay station switches from reception mode to transmission mode using the third zone.