Method in which a mobile terminal transmits/receives a signal using a predetermined TDD frame structure in a wireless communication system

A base station (BS) configured to transceive signals using a predetermined TDD frame in a wireless communication system, the BS comprising:

• a transmitter configured to transmit a first midamble to a mobile station (MS) and transmit a second midamble to a relay station (RS),
• wherein the first midamble is transmitted through a downlink access zone of the BS,
• wherein the second midamble is transmitted through a downlink relay zone of a specific frame of each superframe,
• wherein the second midamble is transmitted through a last symbol of a first non-type 3 subframe of the downlink relay zone counting from an end of a downlink zone of the specific frame, and
• wherein a channel bandwidth of the TDD frame is either 5 MHz, 10 MH or 20 MHz.

A method for transceiving signals using a time division duplex (TDD) frame of the RS in a wireless communication system, the method comprising,

• transmitting a first midamble by a relay station (RS) to a mobile station (MS);
• and
• receiving a second midamble by the RS from a base station (BS),
• wherein the first midamble is transmitted through a downlink access zone of the RS,
• wherein the second midamble is received through a downlink relay zone of a specific frame of each superframe,
• wherein the second midamble is received through a last symbol of a first non-type-3 subframe of the downlink relay zone counting from an end of a downlink zone of the specific frame, and
• wherein a channel bandwidth of the TDD frame is either 5 MHz, 10 MH or 20 MHz.

A relay station (RS) for transceiving signals using a time division duplex (TDD) frame of the RS in a wireless communication system, the RS comprising,

• a transmitter configured to transmit a first midamble to a mobile station (MS);
• and
• a receiver configured to receive a second midamble from a base station (BS),
• wherein the first midamble is transmitted through a downlink access zone of the RS,
• wherein the second midamble is received through a downlink relay zone of a specific frame of each superframe,
• wherein the second midamble is received through a last symbol of a first non-type-3 subframe of the downlink relay zone counting from an end of a downlink zone of the specific frame, and
• wherein a channel bandwidth of the TDD frame is either 5 MHz, 10 MH or 20 MHz.