Method of control information for supporting relay system
A frame structure supporting a relay and a method of transmitting control information for supporting a relay system are disclosed. The method of transmitting control information for supporting a relay system comprises configuring a frame to which the relay system is applied; and transmitting a first message to one or more of a mobile station and relay stations, the first message including offset information indicating a beginning time of the frame and zone allocation information indicating configuration of the frame. In this case, a downlink zone of the frame includes a downlink transmit zone and a downlink access zone.
1. A method of transmitting control information for supporting a relay system, the method performed by a relay station (RS) and comprising:
receiving a first message at a downlink (DL) relay zone in a DL subframe from a base station (BS), the first message including preamble offset information indicating a beginning time of a transmission of a broadcast channel (BCH) signal and zone allocation information indicating configuration of odd-hop RS subframes; and
transmitting a second message at a DL transmit zone in the DL subframe to one or more of a mobile station (MS) and a subordinate relay station (SRS), the second message including frame offset information indicating a beginning time of a transmission of a BCH signal and zone allocation information indicating configuration of even-hop RS subframes,
wherein the beginning time of the transmission of the BCH signal is changed according to the preamble offset information, the preamble offset information presenting the beginning time of the transmission of the BCH signal from a current frame,
wherein the DL subframe is one of eight subframes included in a frame and the frame is one of four frames included in a superframe, and
wherein the zone allocation information of the first message includes relay type information indicating whether the RS is an odd-hop RS or an even-hop RS and relay operation information indicating a subframe configuration according to an uni-directional relay system or a bi-directional relay system.
2. The method of claim 1 , wherein the even-hop RS subframes include a DL receive zone, a gap, and the DL transmit zone, when the uni-directional relay system is applied, and
wherein the relay operation information further represents an order of the DL receive zone and the DL transmit zone.
3. The method of claim 1 , wherein the even-hop RS subframes include a DL access zone, a gap, a bi-directional receive zone, and a bi-directional transmit zone, and the DL transmit zone is the bi-directional transmit zone, when the bi-directional relay system is applied,
wherein the relay operation information further represents an order of the DL access zone, the bi-directional receive zone, and the bi-directional transmit zone, and
wherein the RS receives messages from the BS and the SRS in the bi-directional receive zone and transmits messages to the BS and to the SRS in the bi-directional transmit zone.
4. The method of claim 1 , wherein each of the first message and the second message is one of a preamble, a broadcast channel, a super frame header, and a system information message.
5. The method of claim 1 , wherein the zone allocation information includes a DL/UL ratio, a CP length, subframe configuration information, and relay zone allocation information.
6. A relay station (RS) for transmitting control information for supporting a relay system, the RS comprising:
a processor;
a receive module;
a transmit module; and
an antenna transmitting a radio signal received from the outside to the receive module and transmitting a radio signal, which is transferred from the transmit module, to the outside,
wherein the receive module performs demodulation and decoding for the radio signal transferred from the antenna,
the transmit module performs modulation and coding for transmitting the radio signal to the outside,
the processor controls the receive module to receive a first message at a downlink (DL) relay zone in a DL subframe from a base station (BS), the first message including preamble offset information indicating a beginning time of a transmission of a broadcast channel (BCH) signal and zone allocation information indicating configuration of odd-hop RS subframes,
the processor controls the transmit module to transmit a second message at a DL transmit zone in the DL subframe to one or more of a mobile station (MS) and a subordinate relay station (SRS), the second message including frame offset information indicating a beginning time of a transmission of a BCH signal and zone allocation information indicating configuration of even-hop RS subframes, and
wherein the beginning time of the transmission of the BCH signal is changed according to the preamble offset information, the preamble offset information presenting the beginning time of the transmission of the BCH signal from a current frame,
wherein the DL subframe is one of eight subframes included in a frame and the frame is one of four frames included in a superframe, and
wherein the zone allocation information of the first message includes relay type information indicating whether the RS is a odd-hop RS or an even-hop RS and relay operation information indicating a subframe configuration according to an uni-directional relay system or a bi-directional relay system.
7. The relay station of claim 6 , wherein each of the first message and the second message is any one of a preamble, a broadcast channel, a super frame header, and a system information message.
8. The relay station of claim 6 , wherein the zone allocation information of the first message includes at least one of a downlink and uplink ratio (DL/UL ratio), a cyclic prefix (CP) length, subframe configuration information, and relay zone allocation information.
9. The relay station of claim 6 , wherein the even-hop RS subframes include a DL receive zone, a gap, and the DL transmit zone, when the uni-directional relay system is applied, and
wherein the relay operation information represents an order of the DL receive zone and the DL transmit zone.
10. The relay station of claim 6 , wherein the even-hop RS subframes include a DL access zone, a gap, a bi-directional receive zone, and a bi-directional transmit zone, and the DL transmit zone is the bi-directional transmit zone, when the bi-directional relay system is applied,
wherein the RS receives messages from the BS and the SRS in the bi-directional receive zone and transmits messages to the BS and to the SRS in the bi-directional transmit zone, and
wherein the relay operation information represents an order of the DL access zone, the bi-directional receive zone, and the bi-directional transmit zone.