Method for avoiding interference
The present invention provides a method for avoiding interference resulting from data transmission between an adjacent second base station and a second relay station placed within the coverage of the adjacent second base station. The method for avoiding interference comprises: receiving the radio resource scheduling information from the adjacent second base station; checking the radio resources used in the data transmission between the adjacent second base station and the second relay station based on the received radio resource scheduling information; and scheduling at least one radio resource among uplink radio resources and downlink radio resources for at least one first terminal and at least one first relay station which are connected to a first base station in order to avoid interference with the checked radio resource if the radio resource used in the data transmission from the second base station to the second relay station is checked as the uplink resource or if the radio resource used in the data transmission from the second relay station to the second base station is checked as the downlink resource.
1. A method for avoiding interference resulting from data transmission between a neighboring base station (BS) and a neighboring relay station (RS) placed within the coverage of the neighboring BS, the method performed by a base station (BS), or by a control station of the BS and comprising:
receiving information for decoding neighboring data transmitted/received between the neighboring BS and the neighboring RS from the neighboring BS,
wherein the information for decoding neighboring data includes radio resource scheduling information for the neighboring data, modulation and coding schemes for the neighboring data, a pre-coding matrix index for the neighboring data and a reference signal for demodulating the neighboring data;
if the neighboring data is simultaneously received with data transmitted from a terminal which is connected to the BS, decoding the neighboring data based on the information for decoding the neighboring data; and
removing interference corresponding to the decoded neighboring data from data received through an uplink to acquire the data transmitted from the terminal.
2. The method of claim 1 , further comprising:
if a checked radio resource for the neighboring data is a subframe of a Time Division Duplex (TDD) mode, allocating one or more subframes rather than the subframe corresponding to the checked radio resource to at least one first terminal and at least one RS connected to the BS.
3. The method of claim 1 , further comprising:
if a checked radio resource for the neighboring data is a specific band of a Frequency Division Duplex (FDD) mode, performing resource allocation so that the specific band is not used by at least one terminal and at least one RS connected to the BS at a time point when data is being transmitted or received between the neighboring BS and the neighboring RS.
4. The method of claim 1 , further comprising:
calculating an interference level with at least one of the neighboring BS and the neighboring RS.
5. The method of claim 4 , further comprising:
feeding-back information on the interference level to the neighboring BS.
6. The method of claim 1 , further comprising:
transmitting a signal or message for requesting to control transmission power of the neighboring BS.
7. The method of claim 1 , further comprising:
receiving a reference signal from the neighboring BS,
wherein the interference level is calculated by using the reference signal.
8. The method of claim 1 , further comprising:
acquiring information for decoding data transmitted/received from the neighboring BS to the neighboring RS, if the radio resource used for data transmission from the neighboring BS to the neighboring RS is a downlink radio resource; and
transmitting the information for decoding data to the terminal so that it is possible for the terminal to discern and decode data transmitted to the terminal from the BS from data transmitted to the neighboring BS from the neighboring RS.
9. The method of claim 1 , further comprising:
if the radio resource for the neighboring data is a subframe of a Time Division Duplex (TDD) mode, allocating one or more subframes other than the subframe corresponding to the radio resource for the neighboring data to the terminal.
10. The method of claim 1 , further comprising:
if the radio resource for the neighboring data is a specific band of a Frequency Division Duplex (FDD) mode, allocating a frequency band other than the specific band which is not used by the terminal at a time point when data is being transmitted or received between the neighboring BS and the neighboring RS.
11. A method for avoiding interference resulting from data transmission between a neighboring base station (BS) and a neighboring relay station (RS) placed within the coverage of the neighboring BS, the method performed by a base station (BS) or by a control station of the BS and comprising:
receiving information for decoding neighboring data transmitted/received between the neighboring BS and the neighboring RS from the neighboring BS,
wherein the information for decoding neighboring data includes radio resource scheduling information for the neighboring data, modulation and coding schemes for the neighboring data, a pre-coding matrix index for the neighboring data and a reference signal for demodulating the neighboring data;
calculating an interference level due to data transmission between the neighboring BS and the neighboring RS; and
if the interference level is higher than a preset threshold, decoding the neighboring based on the information for decoding the neighboring data; and
removing interference corresponding to the decoded neighboring data from data received through an uplink to acquire the data transmitted from a terminal which is connected to the BS.