Method and apparatus for downlink OFDMA having DFT-precoding applied thereto

1. A method by a base station in a communication system, the method comprising:

determining a number of discrete fourier transform (DFT)-precoding chunks on which a DFT precoding is performed;

determining a power backoff value of a power amplifier (PA) of the base station;

transmitting information indicating the number of DFT-precoding chunks to a terminal;

transmitting, to the terminal, downlink control information (DCI) including a resource allocation field, configured based on the number of DFT-precoding chunks; and

transmitting data to the terminal according to the resource allocation field included in the DCI,

wherein the number of DFT-precoding chunks is associated with the power backoff value of the PA of the base station.

2. The method of claim 1 , further comprising transmitting the information indicating the number of DFT-precoding chunks to the terminal through at least one of system information, a radio resource control (RRC) signaling, and the DCI.

3. The method of claim 1 , further comprising:

determining a size of the determined number of DFT-precoding chunks, and

wherein the resource allocation field is configured based on the determined size of the DFT-precoding chunks.

4. The method of claim 3 , wherein the DCI includes information related to the determined size of the DFT-precoding chunks.

5. A method by a terminal in a communication system, the method comprising:

receiving, from a base station, information indicating a number of discrete fourier transform (DFT)-precoding chunks on which DFT precoding is performed;

receiving, from the base station, downlink control information (DCI) including a resource allocation field configured based on the number of DFT-precoding chunks; and

receiving data from the base station based on the resource allocation field included in the DCI,

wherein the number of DFT-precoding chunks is associated with a power backoff value of a power amplifier (PA) of the base station.

6. The method of claim 5 , further comprising receiving the information indicating the number of DFT-precoding chunks from the base station through at least one of system information, a radio resource control (RRC) signaling, or the DCI.

7. The method of claim 5 , wherein a size of the number of DFT-precoding chunks is further determined by the base station, and

wherein the resource allocation field is configured based on the size of the DFT-precoding chunks.

8. The method of claim 7 , wherein the DCI includes information related to the size of the DFT-precoding chunks.

9. A base station in a communication system, the base station comprising:

a transceiver; and

a controller operably connected to the transceiver, the controller configured to:

determine a number of discrete fourier transform (DFT)-precoding chunks on which DFT precoding is performed,

determine a power backoff value of a power amplifier (PA) of the base station,

transmit information indicating the number of DFT-precoding chunks to a terminal,

transmit, to the terminal, downlink control information (DCI) including a resource allocation field configured based on the number of DFT-precoding chunks, and

transmit data to the terminal according to the resource allocation field included in the DCI,

wherein the number of DFT-precoding chunks is associated with the power backoff value of the PA of the base station.

10. The base station of claim 9 , wherein the controller is further configured to transmit the information indicating the number of DFT-precoding chunks to the terminal through at least one of system information, radio resource control (RRC) signaling, or the DCI.

11. The base station of claim 9 , wherein the controller is configured to:

determine a size of the determined number of DFT-precoding chunks; and

wherein the resource allocation field is configured based on the determined size of the DFT-precoding chunks.

12. The base station of claim 11 , wherein the DCI includes information related to the determined size of the DFT-precoding chunks.

13. A terminal in a communication system, the terminal comprising:

a transceiver; and

a controller operably connected to the transceiver, the controller configured to:

receive, from a base station, information indicating a number of discrete fourier transform (DFT)-precoding chunks on which a DFT precoding is performed,

receive, from the base station, downlink control information (DCI) including a resource allocation field configured based on the number of DFT-precoding chunks, and

receive data from the base station based on the resource allocation field included in the DCI,

wherein the number of DFT-precoding chunks is associated with a power backoff value of a power amplifier (PA) of the base station.

14. The terminal of claim 13 , wherein the transceiver is further configured to receive the information indicating the number of DFT-precoding chunks from the base station through at least one of system information, a radio resource control (RRC) signaling, or downlink control information (DCI).

15. The terminal of claim 13 , wherein a size of the number of DFT-precoding chunks is further determined by the base station, and

wherein the resource allocation field is configured based on the size of the DFT-precoding chunks.

16. The terminal of claim 15 , wherein the DCI includes information related to the size of the DFT-precoding chunks.