Method for reporting channel status information in wireless communication system supporting change in use of wireless resources, and device therefor
The present invention relates to a method and a device for reporting channel status information of a terminal in a wireless communication system supporting a change in use of wireless resources. Particularly, the method comprises the steps of: receiving a change-in-use message for a dynamic change of wireless resource use; measuring channel status information in a channel status information (CSI) reference resource section corresponding to the change-in-use message; and reporting the channel status information to a base station, wherein the CSI reference resource section has a first CSI measurement resource set and a second CSI measurement resource set, the first CSI measurement resource set has a plurality of first wireless resources configured to allow the use of wireless resources to be fixed, and the second CSI measurement resource set has a plurality of second wireless resources configured to allow the use of wireless resources to be reset.
1. A method of reporting channel state information (CSI) by a user equipment (UE) in a wireless communication system supporting usage change of a radio resource, the method comprising:
receiving a reconfiguration message for dynamically changing usage of the radio resource;
measuring the CSI in a CSI reference resource duration corresponding to the reconfiguration message; and
reporting the CSI to a base station (BS),
wherein the CSI reference resource duration includes a first CSI measurement resource set and a second CSI measurement resource set,
the first CSI measurement resource set includes a plurality of first radio resources having fixed radio resource usage, and
the second CSI measurement resource set includes a plurality of second radio resources having reconfigurable radio resource usage.
2. The method according to claim 1 , wherein the CSI is set to a predefined value to indicate a fallback mode when the second CSI measurement resource set is invalid.
3. The method according to claim 2 , wherein the CSI is reported through a predefined uplink resource for the fallback mode.
4. The method according to claim 1 , wherein, when the second CSI measurement resource set is invalid, the CSI is set to CSI reported prior to the CSI reference resource duration, both the first CSI measurement resource set and the second CSI measurement resource set being valid.
5. The method according to claim 1 , wherein the CSI reference resource duration is defined such that only radio resources after a subframe in which the reconfiguration message is transmitted are valid.
6. The method according to claim 1 , wherein the CSI reference resource duration is defined such that only radio resources present after a start subframe of a time window in which the reconfiguration message is transmitted are valid.
7. The method according to claim 6 , wherein the time window is defined according to a period at which the reconfiguration message is identically transmitted.
8. The method according to claim 1 , wherein the CSI reference resource duration is defined such that only radio resources present prior to 4 ms from a subframe for reporting the CSI are valid.
9. The method according to claim 1 , wherein reporting of the CSI corresponds to aperiodic CSI reporting and the CSI reference resource duration is defined such that only radio resources present prior to a timing at which a triggering message for reporting the CSI is received are valid.
10. A user equipment (UE) for reporting channel state information (CSI) in a wireless communication system supporting usage change of a radio resource, the UE comprising:
a radio frequency unit; and
a processor,
wherein the processor is configured to receive a reconfiguration message for dynamically changing usage of the radio resource, measure the CSI in a CSI reference resource duration corresponding to the reconfiguration message, and report the CSI to a base station (BS),
the CSI reference resource duration includes a first CSI measurement resource set and a second CSI measurement resource set,
the first CSI measurement resource set includes a plurality of first radio resources having fixed radio resource usage, and
the second CSI measurement resource set includes a plurality of second radio resources having reconfigurable radio resource usage.