Method whereby terminal measures RRM in wireless communication system, and devices for supporting same

1. A method of performing Radio Resource Management (RRM) measurement by a user equipment in a wireless communication system using multiple analog beams, the method comprising:

calculating an RRM measurement value using Beam Reference Signal (BRS) resources according to at least one of a first RRM measurement method for measuring a channel state per analog beam and a second RRM measurement method for measuring an average channel state for multiple analog beams; and

when reporting of the RRM measurement value calculated according to the at least one of the first and second RRM measurement methods is triggered, reporting the RRM measurement value calculated according to a triggered RRM measurement method.

2. The method of claim 1 , wherein calculating the RRM measurement value according to the first RRM measurement method comprises measuring a channel state per analog beam applied to each base station during a specific time period.

3. The method of claim 2 , wherein when control information indicating the reporting of the RRM measurement value calculated according to the first RRM measurement method is received from a network, the user equipment reports the RRM measurement value calculated according to the first RRM measurement method using a transmission time and a transmission resource indicated by the control information to at least one base station through Layer 1 signaling or Layer 2 signaling.

4. The method of claim 3 , wherein the at least one base station includes at least one of:

a base station establishing a Radio Resource Control (RRC) connection with the user equipment;

a base station transmitting downlink control information or system information to the user equipment;

a base station transmitting the control information indicating the reporting of the RRM measurement value calculated according to the first RRM measurement method; and

a base station indicated by the control information.

5. The method of claim 1 , wherein calculating the RRM measurement value according to the second RRM measurement method comprises measuring an average channel state for at least one analog beam applied to a specific base station at every multiple measurement times.

6. The method of claim 5 , wherein measuring the average channel state for the at least one analog beam applied to the specific base station at every multiple measurement times comprises:

determining a maximum value among received power values on BRS resources for the at least one analog beam applied to the specific base station at each measurement time; and

calculating an average value of maximum values per measurement time.

7. The method of claim 5 , wherein measuring the average channel state for the at least one analog beam applied to the specific base station at every multiple measurement times comprises:

determining a maximum value among received power values on BRS resources for at least one analog beam per antenna port of a BRS for the specific base station at each measurement time; and

calculating an average value of maximum values per measurement time per antenna port of the BRS.

8. The method of claim 5 , wherein measuring the average channel state for the at least one analog beam applied to the specific base station at every multiple measurement times comprises determining an average value of RRM measurement values calculated during a predetermined time period according to the first RRM measurement method as the RRM measurement value calculated according to the second RRM measurement method.

9. The method of claim 5 , further comprising that when control information indicating the reporting of the RRM measurement value calculated according to the second RRM measurement method is received from a network, the user equipment reports the RRM measurement value calculated according to the second RRM measurement method using a transmission time and a transmission resource indicated by the control information to at least one base station through Layer 3 signaling.

10. The method of claim 9 , wherein the at least one base station includes at least one of:

a base station establishing a Radio Resource Control (RRC) connection with the user equipment; and

a base station supporting communication with a Mobility Management Entity (MME).

11. The method of claim 1 , wherein when the user equipment establishes Radio Resource Control (RRC) connections or Dual Connectivity with a Long-Term Evolution (LTE) base station and a New RAT (NR) base station,

wherein the RRM measurement value calculated using the BRS resources according to the first RRM measurement method is transmitted to the NR base station through Layer 1 signaling or Layer 2 signaling, and

wherein the RRM measurement value calculated using the BRS resources according to the second measurement method is transmitted to the LTE base station.

12. The method of claim 1 , wherein the reporting of the RRM measurement value calculated according to the second RRM measurement method is triggered when a specific event occurs.

13. A user equipment for performing Radio Resource Management (RRM) measurement in a wireless communication system using multiple analog beams, the user equipment comprising:

a transmitter;

a receiver; and

a processor connected to the transmitter and the receiver,

wherein the processor is configured to:

calculate an RRM measurement value using Beam Reference Signal (BRS) resources according to at least one of a first RRM measurement method for measuring a channel state per analog beam and a second RRM measurement method for measuring an average channel state for multiple analog beams; and

when reporting of the RRM measurement value calculated according to the at least one of the first and second RRM measurement methods is triggered, report the RRM measurement value calculated according to a triggered RRM measurement method.

14. The user equipment of claim 13 , wherein calculating the RRM measurement value according to the first RRM measurement method comprises measuring a channel state per analog beam applied to each base station during a specific time period.

15. The user equipment of claim 14 , wherein when the processor receives control information indicating the reporting of the RRM measurement value calculated according to the first RRM measurement method from a network, the processor is configured to report the RRM measurement value calculated according to the first RRM measurement method using a transmission time and a transmission resource indicated by the control information to at least one base station through Layer 1 signaling or Layer 2 signaling.

16. The user equipment of claim 13 , wherein calculating the RRM measurement value according to the second RRM measurement method comprises measuring an average channel state for at least one analog beam applied to a specific base station at every multiple measurement times.

17. The user equipment of claim 16 , wherein measuring, by the processor, the average channel state for the at least one analog beam applied to the specific base station at every multiple measurement times comprises:

determining a maximum value among received power values on BRS resources for the at least one analog beam applied to the specific base station at each measurement time; and

calculating an average value of maximum values at the individual measurement times.

18. The user equipment of claim 16 , wherein measuring, by the processor, the average channel state for the at least one analog beam applied to the specific base station at every multiple measurement times comprises:

determining a maximum value among received power values on BRS resources for at least one analog beam per antenna port of a BRS for the specific base station at each measurement time; and

calculating an average value of maximum values per measurement time per antenna port of the BRS.

19. The user equipment of claim 16 , wherein measuring, by the processor, the average channel state for the at least one analog beam applied to the specific base station at every multiple measurement times comprises determining an average value of RRM measurement values calculated during a predetermined time period according to the first RRM measurement method as the RRM measurement value calculated according to the second RRM measurement method.

20. The user equipment of claim 13 , wherein when the user equipment establishes Radio Resource Control (RRC) connections or Dual Connectivity with a Long-Term Evolution (LTE) base station and a New RAT (NR) base station, the processor is configured to:

transmit the RRM measurement value calculated using the BRS resources according to the first RRM measurement method to the NR base station through Layer 1 signaling or Layer 2 signaling; and

transmit the RRM measurement value calculated using the BRS resources according to the second measurement method to the LTE base station.