Method, user equipment and base station for configuring radio frame for offsetting Doppler effect
Flexible employment of frame configuration in light of the Doppler frequency change is proposed. According to the present invention, frame configuration for a predetermined frequency band may be changed. Changing frame configuration in the present invention may include changing the number (≧0) of zero-power subcarriers which alternate with nonzero-power subcarriers.
1. A method for configuring a radio frame by a user equipment, the method comprising:
receiving frame configuration information;
changing a frame configuration for a specific frequency band based on the frame configuration information from a first frame configuration to a second frame configuration; and
transmitting or receiving a signal using a frame configured according to the second frame configuration,
wherein changing the frame configuration includes changing a nonzero-power subcarrier spacing in a frequency domain from ‘N1+1’·Δf according to the first frame configuration to ‘N2+1’·Δf according to the second frame configuration,
wherein Δf is a subcarrier spacing,
wherein N1 is a number of consecutive zero-power subcarriers configured between every two nonzero-power subcarriers according to the first frame configuration, and
wherein N 2 is the number of consecutive zero-power subcarriers configured between every two nonzero-power subcarriers according to the second frame configuration.
2. The method according to claim 1 ,
wherein a sampling frequency fs,2 of the frame configured according to the second frame configuration is equal to a sampling frequency fs,1 according to the first frame configuration, and
wherein, a sampling time Ts,2 of the frame configured according to the second frame configuration is equal to a sampling time Ts,1 according to the first frame configuration.
3. The method according to claim 1 ,
wherein the frame configuration information is applied to a resource region allocated to the user equipment in the specific frequency band.
4. The method according to claim 1 ,
wherein the frame configuration information is applied to a total system bandwidth of the specific frequency band.
5. A user equipment for configuring a radio frame, the user equipment comprising:
a radio frequency (RF) unit; and
a processor configured to control the RF unit, the processor configured to:
control the RF unit to receive frame configuration information;
change a frame configuration for a specific frequency band based on the frame configuration information from a first frame configuration to a second frame configuration; and
control the RF unit to transmit or receive a signal using a frame configured according to the second frame configuration,
change a nonzero-power subcarrier spacing in a frequency domain from ‘N1+1’·Δf according to the first frame configuration to ‘N2+1’·Δf according to the second frame configuration,
wherein Δf is a subcarrier spacing,
wherein N1 is a number of consecutive zero-power subcarriers configured between every two nonzero-power subcarriers according to the first frame configuration, and
wherein N 2 is the number of consecutive zero-power subcarriers configured between every two nonzero-power subcarriers according to the second frame configuration.
6. The user equipment according to claim 5 ,
wherein a sampling frequency fs,2 of the frame configured according to the second frame configuration is equal to a sampling frequency fs,1 according to the first frame configuration, and
wherein, a sampling time Ts,2 of the frame configured according to the second frame configuration is equal to a sampling time Ts,1 according to the first frame configuration.
7. The user equipment according to claim 5 ,
wherein the processor is configured to apply the frame configuration information to a resource region allocated to the user equipment in the specific frequency band.
8. The user equipment according to claim 5 ,
wherein the processor is configured to apply the frame configuration information to a total system bandwidth of the specific frequency band.
9. A method for configuring a radio frame by a base station, the method comprising:
transmitting frame configuration information;
changing a frame configuration for a specific frequency band according to the frame configuration information from a first frame configuration to a second frame configuration; and
transmitting or receiving a signal using a frame configured according to the second frame configuration,
wherein changing the frame configuration includes changing a nonzero-power subcarrier spacing in a frequency domain from ‘N1+1’·Δf according to the first frame configuration to ‘N2+1’·Δf according to the second frame configuration,
wherein Δf is a subcarrier spacing,
wherein N1 is a number of consecutive zero-power subcarriers configured between every two nonzero-power subcarriers according to the first frame configuration, and
wherein N 2 is the number of consecutive zero-power subcarriers configured between every two nonzero-power subcarriers according to the second frame configuration.
10. The method according to claim 9 ,
wherein a sampling frequency fs,2 of the frame configured according to the second frame configuration is equal to a sampling frequency fs,1 according to the first frame configuration, and
wherein, a sampling time Ts,2 of the frame configured according to the second frame configuration is equal to a sampling time Ts,1 according to the first frame configuration.
11. The method according to claim 9 ,
wherein the frame configuration information is applied to a resource region allocated to the user equipment in the specific frequency band.
12. The method according to claim 9 ,
wherein the frame configuration information is applied to a total system bandwidth of the specific frequency band.
13. A base station for configuring a radio frame, the base station comprising:
a radio frequency (RF) unit; and
a processor configured to control the RF unit, the processor configured to:
control the RF unit to transmit frame configuration information;
change a frame configuration for a specific frequency band based on the frame configuration information from a first frame configuration to a second frame configuration;
control the RF unit to transmit or receive a signal using a frame configured according to the second frame configuration; and
change a nonzero-power subcarrier spacing in a frequency domain from ‘N1+1’·Δf according to the first frame configuration to ‘N2+1’·Δf according to the second frame configuration,
wherein ·Δf is a subcarrier spacing,
wherein N1 is a number of consecutive zero-power subcarriers configured between every two nonzero-power subcarriers according to the first frame configuration, and
wherein N 2 is the number of consecutive zero-power subcarriers configured between every two nonzero-power subcarriers according to the second frame configuration.
14. The base station according to claim 13 ,
wherein the processor is configured to apply the frame configuration information to a resource region allocated to the user equipment in the specific frequency band.
15. The base station according to claim 13 ,
wherein the processor is configured to apply the frame configuration information to a total system bandwidth of the specific frequency band.
16. The base station according to claim 13 ,
wherein a sampling frequency f s,2 of the frame configured according to the second frame configuration is equal to a sampling frequency f s,1 according to the first frame configuration, and
wherein, a sampling time T s,2 of the frame configured according to the second frame configuration is equal to a sampling time T s,1 according to the first frame configuration.