Method and user equipment for performing measurement by using multiple reception beams

1. A method for performing measurement by a user equipment (UE), the method comprising:

receiving measurement configuration information from a serving cell;

receiving radio resource configuration information from the serving cell;

determining a first beam class from among a plurality of beam classes based on a number of receiving beams supported by the UE;

transmitting UE capability information;

performing a measurement on a downlink signal; and

transmitting a measurement report to the cell based on the measurement,

wherein the UE capability information includes information about the first beam class to the serving cell, and

wherein the measurement is performed based on a measurement requirement related to the first beam class.

2. The method of claim 1 , further comprising:

receiving downlink data based on the number of receiving beams supported by the UE.

3. The method of claim 1 , wherein the determining of the first beam class comprises:

determining the first beam class from among the plurality of beam classes based on a number of receiving beams used for measurement and determining a second beam class from among the plurality of beam classes based on a number of receiving beams used for downlink data reception, when different numbers of receiving beams are used for measurement and downlink data reception.

4. The method of claim 3 , wherein the UE capability information includes information about the first beam class and information about the second beam class.

5. The method of claim 3 , further comprising:

receiving the downlink data based on the number of receiving beams used for downlink data reception.

6. The method of claim 1 , further comprising:

changing the number of receiving beams when change in mobility of the UE is detected after the UE capability information is transmitted to the serving cell.

7. The method of claim 6 , further comprising:

determining the first beam class from among the plurality of beam classes based on the changed number of receiving beams; and

transmitting UE capability information including information about the first beam class determined based on the changed number of receiving beams to the serving cell.

8. The method of claim 1 , further comprising:

reducing the number of receiving beams when the UE operates in a power saving mode after the UE capability information is transmitted to the serving cell.

9. The method of claim 8 , further comprising:

determining the first beam class from among the plurality of beam classes based on the reduced number of receiving beams; and

transmitting UE capability information including information about the first beam class determined based on the reduced number of receiving beams to the serving cell.

10. The method of claim 1 , wherein the performing the measurement further comprises:

selecting the measurement requirement related to the first beam class from a plurality of measurement requirements related to each of the plurality of beam classes.

11. The method of claim 10 , wherein the plurality of measurement requirements related to each of the plurality of beam classes includes:

at least one of a measurement period for synchronization signal/physical broadcast channel block (SS/PBCH block: SSB) based measurement related to each of the plurality of beam classes, a time period for PSS/SSS detection related to each of the plurality of beam classes, and a radio link monitoring (RLM) evaluation period related to each of the plurality of beam classes.

12. The method of claim 11 , wherein the measurement period, the time period and the evaluation period have different values according to the plurality of beam classes.

13. A user equipment (UE) performing measurement, comprising:

a transceiver; and

a processor configured to control the transceiver,

wherein the processor is configured to:

receive measurement configuration information from a serving cell;

receive radio resource configuration information from the serving cell;

determine a first beam class from among a plurality of beam classes based on a number of receiving beams supported by the UE;

transmit UE capability information;

perform a measurement on a downlink signal; and

transmitting a measurement report to the cell based on the measurement,

wherein the UE capability information includes information about the first beam class to the serving cell, and

wherein the measurement is performed based on a measurement requirement related to the first beam class.

14. The UE of claim 13 , wherein the processor is further configured to:

select the measurement requirement related to the first beam class from a plurality of measurement requirements related to each of the plurality of beam classes,

wherein the plurality of measurement requirements related to each of the plurality of beam classes includes at least one of a measurement period for synchronization signal/physical broadcast channel block (SS/PBCH block: SSB) based measurement related to each of the plurality of beam classes, a time period for PSS/SSS detection related to each of the plurality of beam classes, and a radio link monitoring (RLM) evaluation period related to each of the plurality of beam classes.