Method and apparatus for measuring and reporting channel state in wireless communication system
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The disclosure provides a method for, if an activated BWP is changed in a wireless communication system in which a BWP is configured and operated, effectively measuring and reporting a channel state of the changed BWP. The method performed by a terminal includes receiving, from a base station, configuration information including channel state information (CSI) resource configuration information; receiving, from the base station, DCI including CSI request information; performing a measurement based on CSI resource configuration information corresponding to an activated BWP, in case that the CSI request information is associated with a plurality of CSI resource configuration information; and reporting a result of the measurement.
1. A method performed by a terminal in a wireless communication system, the method comprising:
receiving, from a base station, a radio resource control (RRC) message including channel state information (CSI) configuration information associated with a plurality of trigger states;
receiving, from the base station, downlink control information (DCI) including a CSI request field indicating a trigger state among the plurality of trigger states;
identifying a bandwidth part (BWP) for a channel state information-reference signal (CSI-RS) based on BWP information, wherein the BWP information is included in CSI resource configuration information associated with the trigger state;
performing a measurement for the CSI-RS, in case that the BWP in which the terminal is triggered with the CSI-RS is an active BWP; and
not performing the measurement for the CSI-RS, in case that the BWP in which the terminal is triggered with the CSI-RS is a non-active BWP.
2. The method of claim 1 , wherein
the trigger state is associated with a CSI report, and the CSI report is associated with a CSI-RS and a BWP.
3. The method of claim 1 , wherein the CSI configuration information includes the CSI resource configuration information, CSI reporting configuration information, and a CSI aperiodic trigger state list,
wherein the CSI resource configuration information includes a CSI-RS resource set list and a BWP index,
wherein the CSI reporting configuration information includes a cell index, and
wherein the CSI aperiodic trigger state list includes information on the plurality of trigger states.
4. The method of claim 1 , wherein
a CSI report associated with the non-active BWP is omitted.
5. The method of claim 1 , wherein the active BWP and the non-active BWP are configured for a cell.
6. A method performed by a base station in a wireless communication system, the method comprising:
transmitting, to a terminal, a radio resource control (RRC) message including channel state information (CSI) configuration information associated with a plurality of trigger states; and
transmitting, to the terminal, downlink control information (DCI) including a CSI request field indicating a trigger state among the plurality of trigger states,
wherein the trigger state is associated with CSI resource configuration information including bandwidth part (BWP) information,
wherein a BWP for a channel state information-reference signal (CSI-RS) is identified based on the BWP information,
wherein a measurement for the CSI-RS is performed, in case that the BWP in which the terminal is triggered with the CSI-RS is an active BWP, and
wherein the measurement for the CSI-RS is not performed, in case that the BWP in which the terminal is triggered with the CSI-RS is a non-active BWP.
7. The method of claim 6 , wherein
the trigger state is associated with a CSI report, and the CSI report is associated with a CSI-RS and a BWP.
8. The method of claim 6 , wherein the CSI configuration information includes the CSI resource configuration information, CSI reporting configuration information, and a CSI aperiodic trigger state list,
wherein the CSI resource configuration information includes a CSI-RS resource set list and a BWP index,
wherein the CSI reporting configuration information includes a cell index, and
wherein the CSI aperiodic trigger state list includes information on the plurality of trigger states.
9. The method of claim 6 , wherein
a CSI report associated with the non-active BWP is omitted.
10. A terminal in a wireless communication system, the terminal comprising:
a transceiver configured to transmit and receive signals; and
a processor operably coupled to the transceiver, wherein the processor is configured to:
receive, from a base station a radio resource control (RRC) message including channel state information (CSI) configuration information associated with a plurality of trigger states,
receive, from the base station, downlink control information (DCI) including a CSI request field indicating a trigger state among the plurality of trigger states,
identify a bandwidth part (BWP) for a channel state information-reference signal (CSI-RS) based on BWP information, wherein the BWP information is included in CSI resource configuration information associated with the trigger state,
perform a measurement for the CSI-RS, in case that the BWP in which the terminal is triggered with the CSI-RS is an active BWP, and
not perform the measurement for the CSI-RS, in case that the BWP in which the terminal is triggered with the CSI-RS is a non-active BWP.
11. The terminal of claim 10 , wherein the
trigger state is associated with a CSI report, and the CSI report is associated with a CSI-RS and a
BWP.
12. The terminal of claim 10 , wherein the CSI configuration information includes the CSI resource configuration information, CSI reporting configuration information, and a CSI aperiodic trigger state list,
wherein the CSI resource configuration information includes a CSI-RS resource set list, and a BWP index,
wherein the CSI reporting configuration information includes a cell index, and
wherein the CSI aperiodic trigger state list includes information on the plurality of trigger states.
13. The terminal of claim 10 , wherein
a CSI report associated with the non-active BWP is omitted.
14. A base station in a wireless communication system, the base station comprising:
a transceiver configured to transmit and receive signals; and
a processor operably coupled to the transceiver, wherein the processor is configured to:
transmit, to a terminal, a radio resource control (RRC) message including channel state information (CSI) configuration information associated with a plurality of trigger states, and
transmit, to the terminal, downlink control information (DCI) including a CSI request field indicating a trigger state among the plurality of trigger states,
wherein the trigger state is associated with CSI resource configuration information including bandwidth part (BWP) information,
wherein a BWP for a channel state information-reference signal (CSI-RS) is identified based on the BWP information,
wherein a measurement for the CSI-RS is performed, in case that the BWP in which the terminal is triggered with the CSI-RS is an active BWP, and
wherein the measurement for the CSI-RS is not performed, in case that the BWP in which the terminal is triggered with the CSI-RS is a non-active BWP.
15. The base station of claim 14 , wherein the
trigger state is associated with a CSI report, and the CSI report is associated with a CSI-RS and a BWP.
16. The base station of claim 14 , wherein the CSI configuration information includes the CSI resource configuration information, CSI reporting configuration information, and a CSI aperiodic trigger state list,
wherein the CSI resource configuration information includes a CSI-RS resource set list and a BWP index,
wherein the CSI reporting configuration information includes a cell index, and
wherein the CSI aperiodic trigger state list includes information on the plurality of trigger states.
17. The base station of claim 14 , wherein
a CSI report associated with the non-active BWP is omitted.