Relay station, mobile station, and relay transmission method in mobile communication system

A mobile station comprising:

• a receiving section that receives, in a first coverage area, a signal transmitted by a base station employing a first radio access technique and covering the first coverage area, and that receives a signal relayed by a relay station in a third coverage area that is identical to a second coverage area, part or entirety of which includes the first coverage area, and which is covered by a host station employing a second radio access technique different from the first radio access technique;
• and
• a detection section that detects whether or not the mobile station is located in the second coverage area, based on which one of a frequency offset, a time offset and a power offset is added to the received signal.

A relay transmission method comprising the steps of:

• adding one of a frequency offset, a time offset and a power offset to a signal received from a base station, employing a first radio access technique and covering a first coverage area;
• and
• transmitting the signal with one offset to a mobile station in a third coverage area that is identical to a second coverage area, part or entirety of which includes the first coverage area, and which is covered by a host station employing a second radio access technique different from the first radio access technique.