Method and apparatus for transmitting and receiving data

1. A method for receiving data at a User Equipment (UE), the method comprising:

receiving information for at least one transmission mode among multiple transmission modes from a Base Station through higher layer signaling;

receiving information for a Multimedia Broadcast Multicast Service Single Frequency Network (MBSFN) sub-frame from the Base Station through the higher layer signaling;

receiving Downlink Control Information (DCI) for a data signal;

determining at least one reference signal corresponding to a current sub-frame based on the information for the least one transmission mode and the information for the MBSFN sub-frame; and

receiving the data signal based on the reference signal.

2. The method of claim 1 , wherein at least one of the multiple transmission modes is based on a Common Reference Signal (CRS) and at least one of the multiple transmission modes is based on a DeModulation Reference Signal (DM-RS).

3. The method of claim 2 , wherein determining the at least one reference signal corresponding to the current sub-frame comprises:

receiving the data signal from the Base Station based on at least one transmission mode for the MBSFN sub-frame, when the current sub-frame is the MBSFN sub-frame; and

receiving the data signal from the Base Station according to at least one transmission mode for a normal sub-frame, when the current sub-frame is the normal sub-frame.

4. The method of claim 1 , wherein the at least one reference signal corresponding to the current sub-frame is determined further based on a format of the DCI.

5. The method of claim 4 , wherein the format of the DCI includes information for a Demodulation-Reference Signal (DM-RS).

6. A method for transmitting data at a Base Station, the method comprising:

transmitting information for at least one transmission mode among multiple transmission modes from the Base Station through higher layer signaling;

transmitting information for a Multimedia Broadcast Multicast Service Single Frequency Network (MBSFN) sub-frame from the Base Station through the higher layer signaling;

determining at least one reference signal corresponding to a current sub-frame based on the information for the at least one transmission mode and the information for the MBSFN sub-frame;

transmitting Downlink Control Information (DCI) for a data signal; and

transmitting the data signal and the at least one reference signal.

7. The method of claim 6 , wherein at least one of the multiple transmission modes is based on a Common Reference Signal (CRS) and at least one of the multiple transmission modes is based on a DeModulation Reference Signal (DM-RS).

8. The method of claim 6 , wherein the at least one reference signal corresponding to the current sub-frame is determined further based on a format of the DCI.

9. The method of claim 8 , wherein the format of the DCI includes information for a Demodulation-Reference Signal (DM-RS).

10. An apparatus for receiving data, the apparatus comprising:

a receiving controller for receiving information for at least one transmission mode among multiple transmission modes from a Base Station through higher layer signaling, receiving information for a Multimedia Broadcast Multicast Service Single Frequency Network (MBSFN) sub-frame from the Base Station through the higher layer signaling, receiving Downlink Control Information (DCI) for a data signal, and determining at least one reference signal corresponding to a current sub-frame based on the information for the at least one transmission mode and the information for the MBSFN sub-frame; and

a data processor for processing the data signal based on the reference signal.

11. The apparatus of claim 10 , wherein at least one of the multiple transmission modes is based on a Common Reference Signal (CRS) and at least one of the multiple transmission modes is based on a DeModulation Reference Signal (DM-RS).

12. The apparatus of claim 11 , wherein the receiving controller receives the data signal from the Base Station based on at least one transmission mode for the MBSFN sub-frame, when the current sub-frame is the MBSFN sub-frame, and receives the data signal from the Base Station based on at least one transmission mode for a normal sub-frame, when the current sub-frame is the normal sub-frame.

13. The apparatus of claim 10 , wherein the at least one reference signal corresponding to the current sub-frame is determined further based on a format of the DCI.

14. The method of claim 13 , wherein the format of the DCI includes information for a Demodulation-Reference Signal (DM-RS).

15. An apparatus for transmitting data, the apparatus comprising:

a transmission controller for transmitting information for at least one transmission mode among multiple transmission modes from a Base Station through the higher layer signaling, transmitting information for a Multimedia Broadcast Multicast Service Single Frequency Network (MBSFN) sub-frame from the Base Station through the higher layer signaling, determining at least one reference signal corresponding to a current sub-frame based on the information for the at least one transmission mode and the information for the MBSFN sub-frame, transmitting Downlink Control Information (DCI) for a data signal, and transmitting the data signal and the at least one reference signal; and

a multiplexer for multiplexing the data signal and the at least reference signal based on the at least one reference signal.

16. The apparatus of claim 15 , wherein at least one of the multiple transmission modes is based on a Common Reference Signal (CRS) and at least one of the multiple transmission modes is based on a DeModulation Reference Signal (DM-RS).

17. The apparatus of claim 15 , wherein the at least one reference signal corresponding to the current sub-frame is determined further based on a format of the DCI.

18. The method of claim 17 , wherein the format of the DCI includes information for a Demodulation-Reference Signal (DM-RS).